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Alió Del Barrio JL, Chung DD, Al-Shymali O, Barrington A, Jatavallabhula K, Swamy VS, Yébana P, Angélica Henríquez-Recine M, Boto-de-Los-Bueis A, Alió JL, Aldave AJ. Punctiform and Polychromatic Pre-Descemet Corneal Dystrophy: Clinical Evaluation and Identification of the Genetic Basis. Am J Ophthalmol 2020; 212:88-97. [PMID: 31782998 DOI: 10.1016/j.ajo.2019.11.024] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/08/2019] [Revised: 11/18/2019] [Accepted: 11/19/2019] [Indexed: 12/13/2022]
Abstract
PURPOSE This study reports the clinical features and genetic bases of 3 previously unreported families with punctiform and polychromatic pre-Descemet corneal dystrophy (PPPCD). DESIGN Observational case series. METHODS Full ophthalmic assessment was performed for members of 3 unreported families with PPPCD. Structural and biomechanical alterations of the cornea were screened. Whole exome sequencing (WES) was performed in the first family. Novel or rare variants that segregated with the affected status were screened in the other 2 families using Sanger sequencing. Identified variants that segregated with the affected status in all families were characterized by using in silico prediction tools and/or in vitro splice assays. Additionally, 2 previously reported PPPCD families were screened for variants identified in the 3 unreported PPPCD families. RESULTS PPPCD was diagnosed in 12 of the 21 examined members of the 3 unreported families. The only refractive, topographic, or biomechanical abnormality associated with PPPCD was a significantly increased corneal stiffness. WES and Sanger sequencing identified 2 variants that segregated with the affected status in all 3 families: a rare intronic PDZD8 c.872+10A>T variant and a novel missense PRDX3 c.568G>C (p.Asp190His) variant. The same PRDX3 variant was identified in the previously reported PPPCD family expressing the common PPPCD phenotype and was predicted by in silico prediction tools to be damaging to protein function. CONCLUSIONS PPPCD is associated with an alteration of corneal biomechanics and a novel missense variant in PRDX3. Screening of additional families will determine whether all families demonstrate a PRDX3 variant or whether locus heterogeneity may exist for PPPCD.
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Affiliation(s)
- Jorge L Alió Del Barrio
- Cornea, Cataract and Refractive Surgery Unit, Vissum Corporación, Alicante, Spain; Division of Ophthalmology, School of Medicine, Universidad Miguel Hernández, Alicante, Spain
| | - Doug D Chung
- Stein Eye Institute, David Geffen School of Medicine, University of California Los Angeles, Los Angeles, California, USA
| | - Olena Al-Shymali
- Cornea, Cataract and Refractive Surgery Unit, Vissum Corporación, Alicante, Spain
| | - Alice Barrington
- Stein Eye Institute, David Geffen School of Medicine, University of California Los Angeles, Los Angeles, California, USA
| | - Kavya Jatavallabhula
- Stein Eye Institute, David Geffen School of Medicine, University of California Los Angeles, Los Angeles, California, USA
| | - Vinay S Swamy
- Stein Eye Institute, David Geffen School of Medicine, University of California Los Angeles, Los Angeles, California, USA
| | - Pilar Yébana
- Cornea, Cataract and Refractive Surgery Unit, Vissum Corporación, Alicante, Spain
| | | | | | - Jorge L Alió
- Cornea, Cataract and Refractive Surgery Unit, Vissum Corporación, Alicante, Spain; Division of Ophthalmology, School of Medicine, Universidad Miguel Hernández, Alicante, Spain
| | - Anthony J Aldave
- Stein Eye Institute, David Geffen School of Medicine, University of California Los Angeles, Los Angeles, California, USA.
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Abstract
The cornea, the eye's outermost layer, protects the eye from the environment. The cornea's innermost layer is an endothelium separating the stromal layer from the aqueous humor. A central role of the endothelium is to maintain stromal hydration state. Defects in maintaining this hydration can impair corneal clarity and thus visual acuity. Two endothelial corneal dystrophies, Fuchs Endothelial Corneal Dystrophy (FECD) and Congenital Hereditary Endothelial Dystrophy (CHED), are blinding corneal diseases with varied clinical presentation in patients across different age demographics. Recessive CHED with an early onset (typically age: 0-3 years) and dominantly inherited FECD with a late onset (age: 40-50 years) have similar phenotypes, although caused by defects in several different genes. A range of molecular mechanisms have been proposed to explain FECD and CHED pathology given the involvement of multiple causative genes. This critical review provides insight into the proposed molecular mechanisms underlying FECD and CHED pathology along with common pathways that may explain the link between the defective gene products and provide a new perspective to view these genetic blinding diseases.
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Affiliation(s)
- Darpan Malhotra
- Department of Biochemistry, University of Alberta, Edmonton, AB, Canada
- Membrane Protein Disease Research Group, University of Alberta, Edmonton, AB, Canada
| | - Joseph R Casey
- Department of Biochemistry, University of Alberta, Edmonton, AB, Canada.
- Membrane Protein Disease Research Group, University of Alberta, Edmonton, AB, Canada.
- Department of Physiology, University of Alberta, Edmonton, AB, Canada.
- Department of Ophthalmology and Visual Science, University of Alberta, Edmonton, AB, Canada.
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Jing Y, Zhou Y, Wang C, Liu J, Guo Y, Mao S, Chan HF, Tang S, Chen J. Establishment of a non-integrate iPS cell line CSUASOi002-A, from urine-derived cells of a female patient with macular corneal dystrophy carrying compound heterozygous CHST6 mutations. Stem Cell Res 2019; 41:101598. [PMID: 31669782 DOI: 10.1016/j.scr.2019.101598] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/15/2019] [Revised: 09/16/2019] [Accepted: 09/19/2019] [Indexed: 12/27/2022] Open
Abstract
We report the human induced pluripotent stem cell line (iPSC) CSUASOi002-A, generated from urine-derived cells (UCs) from a 51-year-old female patient carrying compound heterozygous mutations (c.62_63delTinsGA and c.C892T) in the carbohydrate sulfotransferase 6 gene (CHST6). This patient was from a Chinese family of three siblings with macular corneal dystrophy (MCD). Patient UCs were reprogrammed by electroporation using the episomal plasmids (OCT4, SOX2, KLF4, l-MYC, LIN28 and shP53). The human MCD-UiPS cell line CSUASOi002-A retained the disease-associated genotype, while expressed pluripotent stem cell markers and could be differentiated into cells of all three germ layers.
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Affiliation(s)
- Yutong Jing
- Aier School of Ophthalmology, Central South University, P.R.C., 18th floor, the New century building, #198 Furong Middle Road, Changsha, Hunan 410015, PR China; Aier Eye Institute, 18th floor, the New century building, #198 Furong Middle Road, Changsha, Hunan 410015, PR China
| | - Yalan Zhou
- Aier School of Ophthalmology, Central South University, P.R.C., 18th floor, the New century building, #198 Furong Middle Road, Changsha, Hunan 410015, PR China; Aier Eye Institute, 18th floor, the New century building, #198 Furong Middle Road, Changsha, Hunan 410015, PR China
| | - Congxiang Wang
- Changsha Aier Eye Hospital, #388 Furong Middle Road, Changsha, Hunan 410015, RP China
| | - Jian Liu
- Aier Eye Institute, 18th floor, the New century building, #198 Furong Middle Road, Changsha, Hunan 410015, PR China
| | - Yonglong Guo
- Key Laboratory for Regenerative Medicine, Ministry of Education, Jinan University, Guangzhou 510632, RP China
| | - Shengru Mao
- Aier School of Ophthalmology, Central South University, P.R.C., 18th floor, the New century building, #198 Furong Middle Road, Changsha, Hunan 410015, PR China; Aier Eye Institute, 18th floor, the New century building, #198 Furong Middle Road, Changsha, Hunan 410015, PR China
| | - Hon Fai Chan
- Institute for Tissue Engineering and Regenerative Medicine, The Chinese University of Hong Kong, Hong Kong, PR China; School of Biomedical Sciences, Faculty of Medicine, The Chinese University of Hong Kong, Hong Kong, PR China
| | - Shibo Tang
- Aier School of Ophthalmology, Central South University, P.R.C., 18th floor, the New century building, #198 Furong Middle Road, Changsha, Hunan 410015, PR China; Aier Eye Institute, 18th floor, the New century building, #198 Furong Middle Road, Changsha, Hunan 410015, PR China; CAS Center for Excellence in Brain Science and Intelligence Technology, Shanghai 200031, PR China.
| | - Jiansu Chen
- Aier School of Ophthalmology, Central South University, P.R.C., 18th floor, the New century building, #198 Furong Middle Road, Changsha, Hunan 410015, PR China; Aier Eye Institute, 18th floor, the New century building, #198 Furong Middle Road, Changsha, Hunan 410015, PR China; Key Laboratory for Regenerative Medicine, Ministry of Education, Jinan University, Guangzhou 510632, RP China; Institute of Ophthalmology, Medical College, Jinan University, Guangzhou 510632, RP China.
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Jiang SY, Tang JJ, Xiao X, Qi W, Wu S, Jiang C, Hong J, Xu J, Song BL, Luo J. Schnyder corneal dystrophy-associated UBIAD1 mutations cause corneal cholesterol accumulation by stabilizing HMG-CoA reductase. PLoS Genet 2019; 15:e1008289. [PMID: 31323021 PMCID: PMC6668851 DOI: 10.1371/journal.pgen.1008289] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/24/2019] [Revised: 07/31/2019] [Accepted: 07/04/2019] [Indexed: 11/29/2022] Open
Abstract
Schnyder corneal dystrophy (SCD) is a rare genetic eye disease characterized by corneal opacification resulted from deposition of excess free cholesterol. UbiA prenyltransferase domain-containing protein-1 (UBIAD1) is an enzyme catalyzing biosynthesis of coenzyme Q10 and vitamin K2. More than 20 UBIAD1 mutations have been found to associate with human SCD. How these mutants contribute to SCD development is not fully understood. Here, we identified HMGCR as a binding partner of UBIAD1 using mass spectrometry. In contrast to the Golgi localization of wild-type UBIAD1, SCD-associated mutants mainly resided in the endoplasmic reticulum (ER) and competed with Insig-1 for HMGCR binding, thereby preventing HMGCR from degradation and increasing cholesterol biosynthesis. The heterozygous Ubiad1 G184R knock-in (Ubiad1G184R/+) mice expressed elevated levels of HMGCR protein in various tissues. The aged Ubiad1G184R/+ mice exhibited corneal opacification and free cholesterol accumulation, phenocopying clinical manifestations of SCD patients. In summary, these results demonstrate that SCD-associated mutations of UBIAD1 impair its ER-to-Golgi transportation and enhance its interaction with HMGCR. The stabilization of HMGCR by UBIAD1 increases cholesterol biosynthesis and eventually causes cholesterol accumulation in the cornea. Schnyder corneal dystrophy (SCD) is a rare genetic eye disease caused by deposition of free cholesterol in the cornea. It is closely correlated with mutations in the UbiA prenyltransferase domain-containing protein-1 (UBIAD1) gene, which encodes an enzyme catalyzing biosynthesis of coenzyme Q10 and vitamin K2. The underlying mechanism by which UBIAD1 mutations result in SCD development is unclear. Here, we report that SCD-associated mutations trap UBIAD1 in the ER and block Insig-1 mediated HMGCR degradation. We also generated a heterozygous mouse model (Ubiad1G184R/+) that mimics human SCD. We conclude that SCD-associated UBIAD1 mutations decrease HMGCR degradation and subsequently increase cholesterol biosynthesis in the cornea.
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Affiliation(s)
- Shi-You Jiang
- Hubei Key Laboratory of Cell Homeostasis, College of Life Sciences, Wuhan University, Wuhan, China
| | - Jing-Jie Tang
- The State Key Laboratory of Molecular Biology, Institute of Biochemistry and Cell Biology, University of Chinese Academy of Sciences, Chinese Academy of Sciences, Shanghai, China
| | - Xu Xiao
- The State Key Laboratory of Molecular Biology, Institute of Biochemistry and Cell Biology, University of Chinese Academy of Sciences, Chinese Academy of Sciences, Shanghai, China
| | - Wei Qi
- School of Life Science and Technology, ShanghaiTech University, Shanghai, China
| | - Suqian Wu
- Department of Ophthalmology and Visual Science, Eye Institute, Eye and ENT Hospital, Shanghai Medical College of Fudan University, NHC Key Laboratory of myopia (Fudan University), Shanghai Key Laboratory of Visual Impairment and Restoration, Shanghai, China
| | - Chao Jiang
- Department of Ophthalmology and Visual Science, Eye Institute, Eye and ENT Hospital, Shanghai Medical College of Fudan University, NHC Key Laboratory of myopia (Fudan University), Shanghai Key Laboratory of Visual Impairment and Restoration, Shanghai, China
| | - Jiaxu Hong
- Department of Ophthalmology and Visual Science, Eye Institute, Eye and ENT Hospital, Shanghai Medical College of Fudan University, NHC Key Laboratory of myopia (Fudan University), Shanghai Key Laboratory of Visual Impairment and Restoration, Shanghai, China
| | - Jianjiang Xu
- Department of Ophthalmology and Visual Science, Eye Institute, Eye and ENT Hospital, Shanghai Medical College of Fudan University, NHC Key Laboratory of myopia (Fudan University), Shanghai Key Laboratory of Visual Impairment and Restoration, Shanghai, China
- * E-mail: (JX); (BLS); (JL)
| | - Bao-Liang Song
- Hubei Key Laboratory of Cell Homeostasis, College of Life Sciences, Wuhan University, Wuhan, China
- Shenzhen Institute of Wuhan University, Shenzhen, China
- * E-mail: (JX); (BLS); (JL)
| | - Jie Luo
- Hubei Key Laboratory of Cell Homeostasis, College of Life Sciences, Wuhan University, Wuhan, China
- * E-mail: (JX); (BLS); (JL)
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Ivarsdottir EV, Benonisdottir S, Thorleifsson G, Sulem P, Oddsson A, Styrkarsdottir U, Kristmundsdottir S, Arnadottir GA, Thorgeirsson G, Jonsdottir I, Zoega GM, Thorsteinsdottir U, Gudbjartsson DF, Jonasson F, Holm H, Stefansson K. Sequence variation at ANAPC1 accounts for 24% of the variability in corneal endothelial cell density. Nat Commun 2019; 10:1284. [PMID: 30894546 PMCID: PMC6427039 DOI: 10.1038/s41467-019-09304-9] [Citation(s) in RCA: 20] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/15/2018] [Accepted: 02/28/2019] [Indexed: 12/20/2022] Open
Abstract
The corneal endothelium is vital for transparency and proper hydration of the cornea. Here, we conduct a genome-wide association study of corneal endothelial cell density (cells/mm2), coefficient of cell size variation (CV), percentage of hexagonal cells (HEX) and central corneal thickness (CCT) in 6,125 Icelanders and find associations at 10 loci, including 7 novel. We assess the effects of these variants on various ocular biomechanics such as corneal hysteresis (CH), as well as eye diseases such as glaucoma and corneal dystrophies. Most notably, an intergenic variant close to ANAPC1 (rs78658973[A], frequency = 28.3%) strongly associates with decreased cell density and accounts for 24% of the population variance in cell density (β = -0.77 SD, P = 1.8 × 10-314) and associates with increased CH (β = 0.19 SD, P = 2.6 × 10-19) without affecting risk of corneal diseases and glaucoma. Our findings indicate that despite correlations between cell density and eye diseases, low cell density does not increase the risk of disease.
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Affiliation(s)
- Erna V Ivarsdottir
- deCODE genetics/Amgen, Reykjavik, Iceland
- School of Engineering and Natural Sciences, University of Iceland, Reykjavik, Iceland
| | | | | | | | | | | | | | | | - Gudmundur Thorgeirsson
- deCODE genetics/Amgen, Reykjavik, Iceland
- Faculty of Medicine, School of Health Sciences, University of Iceland, Reykjavik, Iceland
- Division of Cardiology, Department of Internal Medicine, Landspitali, The National University Hospital of Iceland, Reykjavik, Iceland
| | - Ingileif Jonsdottir
- deCODE genetics/Amgen, Reykjavik, Iceland
- Faculty of Medicine, School of Health Sciences, University of Iceland, Reykjavik, Iceland
- Department of Immunology, Landspitali, The National University Hospital of Iceland, Reykjavik, Iceland
| | - Gunnar M Zoega
- Department of Ophthalmology, Landspitali, The National University Hospital of Iceland, Reykjavik, Iceland
| | - Unnur Thorsteinsdottir
- deCODE genetics/Amgen, Reykjavik, Iceland
- Faculty of Medicine, School of Health Sciences, University of Iceland, Reykjavik, Iceland
| | - Daniel F Gudbjartsson
- deCODE genetics/Amgen, Reykjavik, Iceland
- School of Engineering and Natural Sciences, University of Iceland, Reykjavik, Iceland
| | - Fridbert Jonasson
- Faculty of Medicine, School of Health Sciences, University of Iceland, Reykjavik, Iceland
- Department of Ophthalmology, Landspitali, The National University Hospital of Iceland, Reykjavik, Iceland
| | - Hilma Holm
- deCODE genetics/Amgen, Reykjavik, Iceland.
| | - Kari Stefansson
- deCODE genetics/Amgen, Reykjavik, Iceland.
- Faculty of Medicine, School of Health Sciences, University of Iceland, Reykjavik, Iceland.
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Li S, Hundal KS, Chen X, Choi M, Ogando DG, Obukhov AG, Bonanno JA. R125H, W240S, C386R, and V507I SLC4A11 mutations associated with corneal endothelial dystrophy affect the transporter function but not trafficking in PS120 cells. Exp Eye Res 2019; 180:86-91. [PMID: 30557570 PMCID: PMC6389376 DOI: 10.1016/j.exer.2018.12.003] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/12/2018] [Revised: 11/28/2018] [Accepted: 12/11/2018] [Indexed: 11/26/2022]
Abstract
SLC4A11 mutations are associated with Fuchs' endothelial corneal dystrophy (FECD), congenital hereditary endothelial dystrophy (CHED) and Harboyan syndrome (endothelial dystrophy with auditory deficiency). Mice with genetically ablated Slc4a11 recapitulate CHED, exhibiting significant corneal edema and altered endothelial morphology. We recently demonstrated that SLC4A11 functions as an NH3 sensitive, electrogenic H+ transporter. Here, we investigated the properties of five clinically relevant SLC4A11 mutants: R125H, W240S, C386R, V507I and N693A, relative to wild type, expressed in a PS120 fibroblast cell line. The effect of these mutations on the NH4Cl-dependent transporter activity was investigated by intracellular pH and electrophysiology measurements. Relative to plasma membrane expression of NaK ATPase, there were no significant differences in plasma membrane SLC4A11 expression among each mutant and wild type. All mutants revealed a marked decrease in acidification in response to NH4Cl when compared to wild type, indicating a decreased H+ permeability in mutants. All mutants exhibited significantly reduced H+ currents at negative holding potentials as compared to wild type. Uniquely, the C386R and W240S mutants exhibited a different inward current profile upon NH4Cl challenges, suggesting an altered transport mode. Thus, our data suggest that these SLC4A11 mutants, rather than having impaired protein trafficking, show altered H+ flux properties.
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Affiliation(s)
- Shimin Li
- School of Optometry, Indiana University Bloomington, Bloomington, IN, USA
| | - Karmjot Singh Hundal
- Department of Cellular & Integrative Physiology - IU School of Medicine, Indianapolis, IN, USA
| | - Xingjuan Chen
- Department of Cellular & Integrative Physiology - IU School of Medicine, Indianapolis, IN, USA
| | - Moonjung Choi
- School of Optometry, Indiana University Bloomington, Bloomington, IN, USA
| | - Diego G Ogando
- School of Optometry, Indiana University Bloomington, Bloomington, IN, USA
| | - Alexander G Obukhov
- Department of Cellular & Integrative Physiology - IU School of Medicine, Indianapolis, IN, USA.
| | - Joseph A Bonanno
- School of Optometry, Indiana University Bloomington, Bloomington, IN, USA.
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Kim EK, Kim S, Maeng YS. Generation of TGFBI knockout ABCG2+/ABCB5+ double-positive limbal epithelial stem cells by CRISPR/Cas9-mediated genome editing. PLoS One 2019; 14:e0211864. [PMID: 30753226 PMCID: PMC6372159 DOI: 10.1371/journal.pone.0211864] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/01/2018] [Accepted: 01/23/2019] [Indexed: 12/26/2022] Open
Abstract
Corneal dystrophy is an autosomal dominant disorder caused by mutations of the transforming growth factor β-induced (TGFBI) gene on chromosome 5q31.8. This disease is therefore ideally suited for gene therapy using genome-editing technology. Here, we isolated human limbal epithelial stem cells (ABCG2+/ABCB5+ double-positive LESCs) and established a TGFBI knockout using RNA-guided clustered regularly interspaced short palindromic repeats (CRISPR)/Cas9 genome editing. An LESC clone generated with a single-guide RNA (sgRNA) targeting exon 4 of the TGFBI gene was sequenced in order to identify potential genomic insertions and deletions near the Cas9/sgRNA-target sites. A detailed analysis of the differences between wild type LESCs and the single LESC clone modified by the TGFBI-targeting sgRNA revealed two distinct mutations, an 8 bp deletion and a 14 bp deletion flanked by a single point mutation. These mutations each lead to a frameshift missense mutation and generate premature stop codons downstream in exon 4. To validate the TGFBI knockout LESC clone, we used single cell culture to isolate four individual sub-clones, each of which was found to possess both mutations present in the parent clone, indicating that the population is homogenous. Furthermore, we confirmed that TGFBI protein expression is abolished in the TGFBI knockout LESC clone using western blot analysis. Collectively, our results suggest that genome editing of TGFBI in LESCs by CRISPR/Cas9 may be useful strategy to treat corneal dystrophy.
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MESH Headings
- ATP Binding Cassette Transporter, Subfamily B
- ATP Binding Cassette Transporter, Subfamily B, Member 1/genetics
- ATP Binding Cassette Transporter, Subfamily G, Member 2/genetics
- CRISPR-Cas Systems/genetics
- Corneal Dystrophies, Hereditary/genetics
- Corneal Dystrophies, Hereditary/pathology
- Corneal Dystrophies, Hereditary/therapy
- Epithelial Cells/metabolism
- Epithelial Cells/pathology
- Extracellular Matrix Proteins/genetics
- Extremities/growth & development
- Extremities/pathology
- Gene Editing
- Gene Expression Regulation/genetics
- Gene Knockout Techniques
- Genetic Therapy
- Humans
- Primary Cell Culture
- RNA, Guide, CRISPR-Cas Systems/genetics
- Sequence Deletion/genetics
- Single-Cell Analysis
- Stem Cells/metabolism
- Transforming Growth Factor beta/genetics
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Affiliation(s)
- Eung Kweon Kim
- Department of Ophthalmology, Corneal Dystrophy Research Institute, Yonsei University College of Medicine, Seoul, South Korea
- Institute of Vision Research, Severance Biomedical Science Institute, Yonsei University College of Medicine, Seoul, South Korea
| | - Seunghyuk Kim
- Institute of Vision Research, Severance Biomedical Science Institute, Yonsei University College of Medicine, Seoul, South Korea
| | - Yong-Sun Maeng
- Department of Ophthalmology, Corneal Dystrophy Research Institute, Yonsei University College of Medicine, Seoul, South Korea
- Department of Obstetrics and Gynecology, Institute of Women’s Life Medical Science, Yonsei University College of Medicine, Seoul, Republic of Korea
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Zhang J, Wu D, Li Y, Fan Y, Dai Y, Xu J. A comprehensive evaluation of 181 reported CHST6 variants in patients with macular corneal dystrophy. Aging (Albany NY) 2019; 11:1019-1029. [PMID: 30716718 PMCID: PMC6382428 DOI: 10.18632/aging.101807] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/23/2018] [Accepted: 01/25/2019] [Indexed: 01/16/2023]
Abstract
Macular corneal dystrophy (MCD) is an autosomal recessive disease featured by bilateral progressive stromal clouding and loss of vision, consequently necessitating corneal transplantation. Variants in CHST6 gene have been recognized as the most critical genetic components in MCD. Although many CHST6 variants have been described until now, the detailed mechanisms underlying MCD are still far from understood. In this study, we integrated all the reported CHST6 variants described in 408 MCD cases, and performed a comprehensive evaluation to better illustrate the causality of these variants. The results showed that majority of these variants (165 out of 181) could be classified as pathogenic or likely pathogenic. Interestingly, we also identified several disease causal variants with ethnic specificity. In addition, the results underscored the strong correlation between mutant frequency and residue conservation in the general population (Spearman's correlation coefficient = -0.311, P = 1.20E-05), thus providing potential candidate targets for further genetic manipulation. The current study highlighted the demand of further functional investigations to evaluate the causality of CHST6 variants, so as to promote earlier accurate diagnosis of MCD and future development of potential targets for genetic therapy.
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Affiliation(s)
- Jing Zhang
- Department of Ophthalmology and Visual Science, Eye Institute, Eye and ENT Hospital, Shanghai Medical College of Fudan University, NHC Key Laboratory of Myopia (Fudan University), Shanghai Key Laboratory of Visual Impairment and Restoration, Shanghai, China
| | - Dan Wu
- Department of Ophthalmology and Visual Science, Eye Institute, Eye and ENT Hospital, Shanghai Medical College of Fudan University, NHC Key Laboratory of Myopia (Fudan University), Shanghai Key Laboratory of Visual Impairment and Restoration, Shanghai, China
| | - Yue Li
- Department of Ophthalmology and Visual Science, Eye Institute, Eye and ENT Hospital, Shanghai Medical College of Fudan University, NHC Key Laboratory of Myopia (Fudan University), Shanghai Key Laboratory of Visual Impairment and Restoration, Shanghai, China
| | - Yidan Fan
- Department of Ophthalmology and Visual Science, Eye Institute, Eye and ENT Hospital, Shanghai Medical College of Fudan University, NHC Key Laboratory of Myopia (Fudan University), Shanghai Key Laboratory of Visual Impairment and Restoration, Shanghai, China
| | - Yiqin Dai
- Department of Ophthalmology and Visual Science, Eye Institute, Eye and ENT Hospital, Shanghai Medical College of Fudan University, NHC Key Laboratory of Myopia (Fudan University), Shanghai Key Laboratory of Visual Impairment and Restoration, Shanghai, China
| | - Jianjiang Xu
- Department of Ophthalmology and Visual Science, Eye Institute, Eye and ENT Hospital, Shanghai Medical College of Fudan University, NHC Key Laboratory of Myopia (Fudan University), Shanghai Key Laboratory of Visual Impairment and Restoration, Shanghai, China
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Sarosiak A, Udziela M, Ścieżyńska A, Oziębło D, Wawrzynowska A, Szaflik JP, Ołdak M. Clinical diversity in patients with Schnyder corneal dystrophy-a novel and known UBIAD1 pathogenic variants. Graefes Arch Clin Exp Ophthalmol 2018; 256:2127-2134. [PMID: 30084067 PMCID: PMC6208719 DOI: 10.1007/s00417-018-4075-9] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/06/2017] [Revised: 06/29/2018] [Accepted: 07/23/2018] [Indexed: 12/21/2022] Open
Abstract
PURPOSE Schnyder corneal dystrophy (SCD) is a rare inherited disease that leads to gradual vision loss by the deposition of lipids in the corneal stroma. The aim of this study is to report a novel pathogenic variant in the UBIAD1 gene and present clinical and molecular findings in Polish patients with SCD. METHODS Individuals (n = 37) originating from four Polish SCD families were subjected for a complete ophthalmological check-up and genetic testing. Corneal changes were visualized by slit-lamp examination, anterior segment optical coherent tomography (AS-OCT), and in vivo confocal microscopy (IVCM). RESULTS In a proband with primarily mild SCD that progressed rapidly at the end of the fifth decade of life, a novel missense pathogenic variant in UBIAD1 (p.Thr120Arg) was identified. The other studied SCD family represents the second family reported worldwide with the UBIAD1 p.Asp112Asn variant. SCD in the remaining two families resulted from a frequently identified p.Asn102Ser pathogenic variant. All affected subjects presented a crystalline form of SCD. The severity of corneal changes was age-dependent, and their morphology and localization are described in detail. CONCLUSION The novel p.Thr120Arg is the fourth SCD-causing variant lying within the FARM motif of the UBIAD1 protein, which underlines a high importance of this motif for SCD pathogenesis. The current study provides independent evidence for the pathogenic potential of UBIAD1 p.Asp112Asn and new information useful for clinicians.
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Affiliation(s)
- Anna Sarosiak
- Department of Histology and Embryology, Center of Biostructure Research, Medical University of Warsaw, T. Chałubińskiego 5, 02-004, Warsaw, Poland
- Postgraduate School of Molecular Medicine, Medical University of Warsaw, Warsaw, Poland
| | - Monika Udziela
- Department of Ophthalmology, Medical University of Warsaw, Warsaw, Poland
| | - Aneta Ścieżyńska
- Department of Histology and Embryology, Center of Biostructure Research, Medical University of Warsaw, T. Chałubińskiego 5, 02-004, Warsaw, Poland
| | - Dominika Oziębło
- Department of Histology and Embryology, Center of Biostructure Research, Medical University of Warsaw, T. Chałubińskiego 5, 02-004, Warsaw, Poland
- Postgraduate School of Molecular Medicine, Medical University of Warsaw, Warsaw, Poland
| | - Anna Wawrzynowska
- Department of Histology and Embryology, Center of Biostructure Research, Medical University of Warsaw, T. Chałubińskiego 5, 02-004, Warsaw, Poland
| | - Jacek P Szaflik
- Department of Ophthalmology, Medical University of Warsaw, Warsaw, Poland
| | - Monika Ołdak
- Department of Histology and Embryology, Center of Biostructure Research, Medical University of Warsaw, T. Chałubińskiego 5, 02-004, Warsaw, Poland.
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Shu A, Li G, Luo H, He J, Hu X, Sun J, Qing Y, Gao L, Zhang J, Yang C, He L, Wan C. [Analysis of TGFBI gene mutation in a pedigree affected with corneal dystrophy]. Zhonghua Yi Xue Yi Chuan Xue Za Zhi 2018; 35:672-674. [PMID: 30298492 DOI: 10.3760/cma.j.issn.1003-9406.2018.05.011] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
OBJECTIVE To detect potential mutation in a large Chinese pedigree affected with congenital corneal dystrophy. METHODS Two patients from the pedigree were subjected to whole exome sequencing to determine the candidate gene. Suspected mutation was verified in 13 additional members by directional Sanger sequencing. Ccorrelation between genotype and phenotype was explored. RESULTS A missense mutation, c.1877A>C (p.His626Pro), was detected in exon 14 of the TGFBI gene in 8 patients from the pedigree, but not in five unaffected members and 100 unrelated healthy controls. Respectively, the mutation was predicted as "affecting protein function", "probably damaging" and "disease causing" by SIFT, PolyPhen-2 and MutationTaster. CONCLUSION The c.1877A>C mutation of the TGFBI gene probably underlies the disease in this pedigree.
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Affiliation(s)
- Anli Shu
- Hunan University of Medicine, Huaihua, Hunan 418000, China.
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Yamashita K, Inagaki E, Hatou S, Higa K, Ogawa A, Miyashita H, Tsubota K, Shimmura S. Corneal Endothelial Regeneration Using Mesenchymal Stem Cells Derived from Human Umbilical Cord. Stem Cells Dev 2018; 27:1097-1108. [PMID: 29929442 DOI: 10.1089/scd.2017.0297] [Citation(s) in RCA: 35] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022] Open
Abstract
Corneal blindness is the third leading cause of blindness in the world, and one of the main etiologies is dysfunction of the corneal endothelium. Current treatment of corneal endothelial disease is allogenic corneal transplantation, which is limited by the global shortage of donor corneas and immunological rejection. The corneal endothelium consists of a monolayer of cells derived from the neural crest and mesoderm. Its main function is to prevent corneal edema by tight junctions formed by zonular occludens-1 (ZO-1) and Na, K-ATPase pump function. The human umbilical cord (UC) is a rich source of mesenchymal stem cells (MSCs). UC-MSCs that have multi-lineage potential may be an accessible allogenic source. After inducing differentiation with medium containing glycogen synthase kinase (GSK) 3-β inhibitor, UC-MSCs formed polygonal corneal endothelial-like cells that functioned as tissue-engineered corneal endothelium (UTECE). Expressions of major corneal endothelial markers were confirmed by reverse transcription-polymerase chain reaction (RT-PCR) and quantitative RT-PCR (qRT-PCR). Western blotting confirmed the expression of Na,K-ATPase and PITX2, the functional and developmental markers of corneal endothelial cells. Immunohistochemistry revealed the localization of Na,K-ATPase and ZO-1 in cell-cell junctions, suggesting the presence of tight junctions. In vitro functional analysis revealed that UTECE had significantly high pump function compared with UC-MSCs. Moreover, UTECE transplanted into a rabbit model of bullous keratopathy successfully maintained corneal thickness and transparency. Our findings suggest that UTECE may be used as a source of allogenic cells for the treatment of corneal endothelial disease.
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Affiliation(s)
- Kazuya Yamashita
- 1 Department of Ophthalmology, Keio University School of Medicine , Tokyo, Japan
| | - Emi Inagaki
- 1 Department of Ophthalmology, Keio University School of Medicine , Tokyo, Japan
| | - Shin Hatou
- 1 Department of Ophthalmology, Keio University School of Medicine , Tokyo, Japan
| | - Kazunari Higa
- 2 Department of Ophthalmology, Tokyo Dental College Ichikawa General Hospital , Ichikawa, Japan
| | - Akiko Ogawa
- 1 Department of Ophthalmology, Keio University School of Medicine , Tokyo, Japan
| | - Hideyuki Miyashita
- 1 Department of Ophthalmology, Keio University School of Medicine , Tokyo, Japan
| | - Kazuo Tsubota
- 1 Department of Ophthalmology, Keio University School of Medicine , Tokyo, Japan
| | - Shigeto Shimmura
- 1 Department of Ophthalmology, Keio University School of Medicine , Tokyo, Japan
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Duan H, Zheng L, Wu H, Xu D, Guan T. [Analysis of TGFBI gene mutation in a Chinese pedigree affected with lattice corneal dystrophy]. Zhonghua Yi Xue Yi Chuan Xue Za Zhi 2018; 35:518-521. [PMID: 30098247 DOI: 10.3760/cma.j.issn.1003-9406.2018.04.013] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
OBJECTIVE To explore the clinical features and mutation of TGFBI gene in a Chinese pedigree affected with lattice corneal dystrophy (LCD). METHODS Genomic DNA was extracted from 35 members including 11 patients from the pedigree. The 17 exons and splicing region of introns of the TGFBI gene were amplified by PCR. The products were directly sequenced and compared with GenBank database to identify potential mutation. Bioinformatic analysis was carried out to predict the effect of mutation on proteins. RESULTS A heterozygous mutation (p.R124C) was found in exon 4 of the TGFBI gene in all patients from the pedigree but not among unaffected members. The mode of inheritance of corneal dystrophy in this pedigree was identified as autosomal dominant. Bioinformatics analysis predicted that the p.R124C mutation may be functionally deleterious. The phenotype of corneal dystrophy in the pedigree was determined to be LCD I type. CONCLUSION The p.R124C mutation of the TGFBI gene probably underlies the pathogenesis of LCD in this Chinese pedigree. Genetic testing can facilitate proper diagnosis of this type of corneal dystrophy.
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Affiliation(s)
- Honghui Duan
- Center of Ophthalmology, Taizhou Municipal Hospital, Taizhou, Zhejiang 318000, China.
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Nagano C, Nozu K, Yamamura T, Minamikawa S, Fujimura J, Sakakibara N, Nakanishi K, Horinouchi T, Iwafuchi Y, Kusuhara S, Matsumiya W, Yoshikawa N, Iijima K. TGFBI-associated corneal dystrophy and nephropathy: a novel syndrome? CEN Case Rep 2018; 8:14-17. [PMID: 30088155 DOI: 10.1007/s13730-018-0356-8] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/15/2018] [Accepted: 07/31/2018] [Indexed: 11/26/2022] Open
Abstract
Transforming growth factor beta-induced (TGFBI)-associated corneal dystrophies are a group of inherited progressive corneal diseases. One of these TGFBI-associated corneal dystrophies is Avellino corneal dystrophy, an autosomal dominant corneal dystrophy characterized by multiple asymmetric stromal opacities that potentially impair vision. Recently, a case with corneal dystrophy complicated by nephropathy possessing a pathogenic variant of the TGFBI gene was reported for the first time. Here, we report the second case with the same condition and the same mutation in the TGFBI gene. The patient was an 18-year-old male. He and his father had already been diagnosed with corneal dystrophy. Proteinuria was revealed in the patient during urine screening at school. Since his serum creatinine level was raised, a percutaneous renal biopsy was performed. Light microscopy demonstrated oligomeganephronia. Electron microscopy demonstrated an irregular basement membrane. TGFBI was analyzed by direct sequencing. A heterozygous mutation c.371G > A in exon 4, which caused an amino acid substitution from arginine to histidine at codon 124, was identified in the patient and his father. Although only one case of TGFBI-associated corneal dystrophy and nephropathy has been reported, our case's clinical and pathological findings were almost identical to those in that reported case. Further investigations of this new disease entity should be reported to all nephrologists and ophthalmologists.
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Affiliation(s)
- China Nagano
- Department of Pediatrics, Kobe University Graduate School of Medicine, 7-5-1 Kusunoki-cho, Chuo-ku, Kobe, Hyogo, 650-0017, Japan.
| | - Kandai Nozu
- Department of Pediatrics, Kobe University Graduate School of Medicine, 7-5-1 Kusunoki-cho, Chuo-ku, Kobe, Hyogo, 650-0017, Japan
| | - Tomohiko Yamamura
- Department of Pediatrics, Kobe University Graduate School of Medicine, 7-5-1 Kusunoki-cho, Chuo-ku, Kobe, Hyogo, 650-0017, Japan
| | - Shogo Minamikawa
- Department of Pediatrics, Kobe University Graduate School of Medicine, 7-5-1 Kusunoki-cho, Chuo-ku, Kobe, Hyogo, 650-0017, Japan
| | - Junya Fujimura
- Department of Pediatrics, Kobe University Graduate School of Medicine, 7-5-1 Kusunoki-cho, Chuo-ku, Kobe, Hyogo, 650-0017, Japan
| | - Nana Sakakibara
- Department of Pediatrics, Kobe University Graduate School of Medicine, 7-5-1 Kusunoki-cho, Chuo-ku, Kobe, Hyogo, 650-0017, Japan
| | - Keita Nakanishi
- Department of Pediatrics, Kobe University Graduate School of Medicine, 7-5-1 Kusunoki-cho, Chuo-ku, Kobe, Hyogo, 650-0017, Japan
| | - Tomoko Horinouchi
- Department of Pediatrics, Kobe University Graduate School of Medicine, 7-5-1 Kusunoki-cho, Chuo-ku, Kobe, Hyogo, 650-0017, Japan
| | - Yoichi Iwafuchi
- Department of Internal Medicine, Koseiren Sanjo General Hospital, Tsukanome 5-1-62, Sanjo, 955-0055, Japan
| | - Sentaro Kusuhara
- Department of Ophthalmology, Kobe University Graduate School of Medicine, 7-5-2 Kusunoki-cho, Chuo-ku, Kobe, Hyogo, 650-0017, Japan
| | - Wataru Matsumiya
- Department of Ophthalmology, Kobe University Graduate School of Medicine, 7-5-2 Kusunoki-cho, Chuo-ku, Kobe, Hyogo, 650-0017, Japan
| | - Norishige Yoshikawa
- Clinical Research Center, Wakayama Medical University, 811-1 Kimiidera, Wakayama, Wakayama, 641-8509, Japan
| | - Kazumoto Iijima
- Department of Pediatrics, Kobe University Graduate School of Medicine, 7-5-1 Kusunoki-cho, Chuo-ku, Kobe, Hyogo, 650-0017, Japan
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Abstract
PURPOSE To report the identification of the collagen, type XVII, alpha 1 (COL17A1) c.3156C>T mutation associated with epithelial recurrent erosion dystrophy (ERED) in a Thai family. METHODS Slit-lamp examination was performed to determine the affected status of each member of a Thai family, with multiple members demonstrating scattered Bowman layer opacities. After genomic deoxyribonucleic acid (DNA) was isolated from saliva, polymerase chain reaction (PCR) amplification and Sanger sequencing were performed to screen COL17A1 and exons 4 and 12 of the transforming growth factor β-induced gene. RESULTS The 67-year-old proband and her 4 siblings were examined by slit-lamp biomicroscopy, which identified bilateral subepithelial opacities in the proband and in one of the 4 siblings. In both the proband and the affected sister, screening of the COL17A1 gene identified a heterozygous c.3156C>T synonymous mutation that has been previously demonstrated to introduce a cryptic splice donor site, likely leading to aberrant splicing of COL17A1. This mutation was not identified in the unaffected siblings, and no mutations were identified in exons 4 and 12 of the transforming growth factor β-induced gene in any of the screened family members. CONCLUSIONS ERED associated with a COL17A1 mutation has been previously reported in only 6 families, all white. Identification of the c.3156C>T mutation, previously identified in 5 of these 6 families, in the Thai family we report indicates conservation of the genetic basis of ERED across different races and underscores the importance of ophthalmologists around the globe being familiar with ERED, which has only recently become a recognized corneal dystrophy.
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Affiliation(s)
- Farnoosh Vahedi
- Stein Eye Institute, David Geffen School of Medicine at UCLA, Los Angeles, CA
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Iglesias AI, Mishra A, Vitart V, Bykhovskaya Y, Höhn R, Springelkamp H, Cuellar-Partida G, Gharahkhani P, Bailey JNC, Willoughby CE, Li X, Yazar S, Nag A, Khawaja AP, Polašek O, Siscovick D, Mitchell P, Tham YC, Haines JL, Kearns LS, Hayward C, Shi Y, van Leeuwen EM, Taylor KD, Bonnemaijer P, Rotter JI, Martin NG, Zeller T, Mills RA, Souzeau E, Staffieri SE, Jonas JB, Schmidtmann I, Boutin T, Kang JH, Lucas SEM, Wong TY, Beutel ME, Wilson JF, Uitterlinden AG, Vithana EN, Foster PJ, Hysi PG, Hewitt AW, Khor CC, Pasquale LR, Montgomery GW, Klaver CCW, Aung T, Pfeiffer N, Mackey DA, Hammond CJ, Cheng CY, Craig JE, Rabinowitz YS, Wiggs JL, Burdon KP, van Duijn CM, MacGregor S. Cross-ancestry genome-wide association analysis of corneal thickness strengthens link between complex and Mendelian eye diseases. Nat Commun 2018; 9:1864. [PMID: 29760442 PMCID: PMC5951816 DOI: 10.1038/s41467-018-03646-6] [Citation(s) in RCA: 47] [Impact Index Per Article: 7.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/24/2017] [Accepted: 03/02/2018] [Indexed: 12/17/2022] Open
Abstract
Central corneal thickness (CCT) is a highly heritable trait associated with complex eye diseases such as keratoconus and glaucoma. We perform a genome-wide association meta-analysis of CCT and identify 19 novel regions. In addition to adding support for known connective tissue-related pathways, pathway analyses uncover previously unreported gene sets. Remarkably, >20% of the CCT-loci are near or within Mendelian disorder genes. These included FBN1, ADAMTS2 and TGFB2 which associate with connective tissue disorders (Marfan, Ehlers-Danlos and Loeys-Dietz syndromes), and the LUM-DCN-KERA gene complex involved in myopia, corneal dystrophies and cornea plana. Using index CCT-increasing variants, we find a significant inverse correlation in effect sizes between CCT and keratoconus (r = -0.62, P = 5.30 × 10-5) but not between CCT and primary open-angle glaucoma (r = -0.17, P = 0.2). Our findings provide evidence for shared genetic influences between CCT and keratoconus, and implicate candidate genes acting in collagen and extracellular matrix regulation.
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MESH Headings
- ADAMTS Proteins/genetics
- ADAMTS Proteins/metabolism
- Asian People
- Cornea/abnormalities
- Cornea/metabolism
- Cornea/pathology
- Corneal Diseases/ethnology
- Corneal Diseases/genetics
- Corneal Diseases/metabolism
- Corneal Diseases/pathology
- Corneal Dystrophies, Hereditary/ethnology
- Corneal Dystrophies, Hereditary/genetics
- Corneal Dystrophies, Hereditary/metabolism
- Corneal Dystrophies, Hereditary/pathology
- Decorin/genetics
- Decorin/metabolism
- Ehlers-Danlos Syndrome/ethnology
- Ehlers-Danlos Syndrome/genetics
- Ehlers-Danlos Syndrome/metabolism
- Ehlers-Danlos Syndrome/pathology
- Eye Diseases, Hereditary/ethnology
- Eye Diseases, Hereditary/genetics
- Eye Diseases, Hereditary/metabolism
- Eye Diseases, Hereditary/pathology
- Fibrillin-1/genetics
- Fibrillin-1/metabolism
- Gene Expression
- Genome, Human
- Genome-Wide Association Study
- Glaucoma, Open-Angle/ethnology
- Glaucoma, Open-Angle/genetics
- Glaucoma, Open-Angle/metabolism
- Glaucoma, Open-Angle/pathology
- Humans
- Keratoconus/ethnology
- Keratoconus/genetics
- Keratoconus/metabolism
- Keratoconus/pathology
- Loeys-Dietz Syndrome/ethnology
- Loeys-Dietz Syndrome/genetics
- Loeys-Dietz Syndrome/metabolism
- Loeys-Dietz Syndrome/pathology
- Lumican/genetics
- Lumican/metabolism
- Marfan Syndrome/ethnology
- Marfan Syndrome/genetics
- Marfan Syndrome/metabolism
- Marfan Syndrome/pathology
- Mendelian Randomization Analysis
- Myopia/ethnology
- Myopia/genetics
- Myopia/metabolism
- Myopia/pathology
- Polymorphism, Single Nucleotide
- Proteoglycans/genetics
- Proteoglycans/metabolism
- Quantitative Trait Loci
- Quantitative Trait, Heritable
- Transforming Growth Factor beta2/genetics
- Transforming Growth Factor beta2/metabolism
- White People
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Affiliation(s)
- Adriana I Iglesias
- Department of Ophthalmology, Erasmus Medical Center, 3000 CA, Rotterdam, The Netherlands
- Department of Epidemiology, Erasmus Medical Center, 3000 CA, Rotterdam, The Netherlands
- Department of Clinical Genetics, Erasmus Medical Center, 3000 CA, Rotterdam, The Netherlands
| | - Aniket Mishra
- University of Bordeaux, Bordeaux Population Health Research Center, INSERM UMR 1219, F-33000, Bordeaux, France
| | - Veronique Vitart
- Institute of Genetics and Molecular Medicine, Medical Research Council Human Genetics Unit, University of Edinburgh, EH42XU, Edinburgh, UK
| | - Yelena Bykhovskaya
- Regenerative Medicine Institute and Department of Surgery, Cedars-Sinai Medical Center, CA 90048, Los Angeles, CA, USA
- Cornea Genetic Eye Institute, CA 90048, Los Angeles, CA, USA
| | - René Höhn
- Department of Ophthalmology, University Medical Center Mainz, 55131, Mainz, Germany
- Department of Ophthalmology, Inselspital, University Hospital Bern, University of Bern, Bern, CH-3010, Switzerland
| | - Henriët Springelkamp
- Department of Ophthalmology, Erasmus Medical Center, 3000 CA, Rotterdam, The Netherlands
| | - Gabriel Cuellar-Partida
- Statistical Genetics, QIMR Berghofer Medical Research Institute, QLD 4029, Brisbane, Australia
| | - Puya Gharahkhani
- Statistical Genetics, QIMR Berghofer Medical Research Institute, QLD 4029, Brisbane, Australia
| | - Jessica N Cooke Bailey
- Department of Population and Quantitative Health Sciences, Case Western Reserve University, OH 44106, Cleveland, OH, USA
- Institute for Computational Biology, Case Western Reserve University, Cleveland, OH, 44106, USA
| | - Colin E Willoughby
- Biomedical Sciences Research Institute, Ulster University, BT52 1SA, Belfast, Northern Ireland, UK
- Royal Victoria Hospital, Belfast Health and Social Care Trust, BT12 6BA, Belfast, Northern Ireland, UK
| | - Xiaohui Li
- Institute for Translational Genomics and Population Sciences and Department of Pediatrics, Los Angeles Biomedical Research Institute at Harbor-UCLA Medical Center, Torrance, CA 90509, CA, USA
- Division of Genomic Outcomes, Departments of Pediatrics and Medicine, Harbor-UCLA Medical Center, Torrance, CA 90502, CA, USA
| | - Seyhan Yazar
- Institute of Genetics and Molecular Medicine, Medical Research Council Human Genetics Unit, University of Edinburgh, EH42XU, Edinburgh, UK
- Centre for Ophthalmology and Visual Science, University of Western Australia, Lions Eye Institute, WA 6009, Perth, WA, Australia
| | - Abhishek Nag
- Department of Twin Research and Genetic Epidemiology, King's College London, WC2R 2LS, London, UK
| | - Anthony P Khawaja
- Department of Public Health and Primary Care, Institute of Public Health, University of Cambridge School of Clinical Medicine, CB2 0SR, Cambridge, UK
- NIHR Biomedical Research Centre, Moorfields Eye Hospital NHS Foundation Trust and UCL Institute of Ophthalmology, EC1V 9EL, London, UK
| | - Ozren Polašek
- Faculty of Medicine, University of Split, HR-21000, Split, Croatia
| | - David Siscovick
- Departments of Medicine and Epidemiology and Cardiovascular Health Research Unit, University of Washington, WA 98101, Washington, USA
- The New York Academy of Medicine, NY 10029, New York, NY, USA
| | - Paul Mitchell
- Centre for Vision Research, Department of Ophthalmology and Westmead Institute for Medical Research, University of Sydney, NSW 2145, Sydney, NSW, Australia
| | - Yih Chung Tham
- Singapore Eye Research Institute, Singapore National Eye Centre, 168751, Singapore, Singapore
| | - Jonathan L Haines
- Department of Population and Quantitative Health Sciences, Case Western Reserve University, OH 44106, Cleveland, OH, USA
- Institute for Computational Biology, Case Western Reserve University, Cleveland, OH, 44106, USA
| | - Lisa S Kearns
- Centre for Eye Research Australia, University of Melbourne, Royal Victorian Eye and Ear Hospital, VIC 3002, East Melbourne, Australia
| | - Caroline Hayward
- Institute of Genetics and Molecular Medicine, Medical Research Council Human Genetics Unit, University of Edinburgh, EH42XU, Edinburgh, UK
| | - Yuan Shi
- Singapore Eye Research Institute, Singapore National Eye Centre, 168751, Singapore, Singapore
| | | | - Kent D Taylor
- Institute for Translational Genomics and Population Sciences and Department of Pediatrics, Los Angeles Biomedical Research Institute at Harbor-UCLA Medical Center, Torrance, CA 90509, CA, USA
- Division of Genomic Outcomes, Departments of Pediatrics and Medicine, Harbor-UCLA Medical Center, Torrance, CA 90502, CA, USA
| | - Pieter Bonnemaijer
- Department of Ophthalmology, Erasmus Medical Center, 3000 CA, Rotterdam, The Netherlands
| | - Jerome I Rotter
- Institute for Translational Genomics and Population Sciences and Department of Pediatrics, Los Angeles Biomedical Research Institute at Harbor-UCLA Medical Center, Torrance, CA 90509, CA, USA
- Division of Genomic Outcomes, Departments of Pediatrics and Medicine, Harbor-UCLA Medical Center, Torrance, CA 90502, CA, USA
| | - Nicholas G Martin
- Department of Genetics and Computational Biology, QIMR Berghofer Medical Research Institute, QLD 4029, Brisbane, Australia
| | - Tanja Zeller
- Department of General and Interventional Cardiology, University Heart Center Hamburg, 20251, Hamburg, Germany
- German Center for Cardiovascular Research (DZHK), Partner Site Hamburg/Kiel/Lübeck, 20246, Hamburg, Germany
| | - Richard A Mills
- Department of Ophthalmology, Flinders University, SA 5042, Adelaide, Australia
| | - Emmanuelle Souzeau
- Department of Ophthalmology, Flinders University, SA 5042, Adelaide, Australia
| | - Sandra E Staffieri
- Centre for Eye Research Australia, University of Melbourne, Royal Victorian Eye and Ear Hospital, VIC 3002, East Melbourne, Australia
| | - Jost B Jonas
- Department of Ophthalmology, Medical Faculty Mannheim of the Ruprecht-Karls-University of Heidelberg, 68167, Mannheim, Germany
| | - Irene Schmidtmann
- Institute for Medical Biostatistics, Epidemiology and Informatics, University Medical Center Mainz, 55131, Mainz, Germany
| | - Thibaud Boutin
- Institute of Genetics and Molecular Medicine, Medical Research Council Human Genetics Unit, University of Edinburgh, EH42XU, Edinburgh, UK
| | - Jae H Kang
- Channing Division of Network Medicine, Brigham and Women's Hospital, Boston, MA 02115, MA, USA
| | - Sionne E M Lucas
- Menzies Institute for Medical Research, University of Tasmania, Hobart, TAS 7005, TAS, Australia
| | - Tien Yin Wong
- Singapore Eye Research Institute, Singapore National Eye Centre, 168751, Singapore, Singapore
- Ophthalmology & Visual Sciences Academic Clinical Program (Eye ACP), Duke-NUS Medical School, 169857, Singapore, Singapore
- Department of Ophthalmology, Yong Loo Lin School of Medicine, National University of Singapore, Singapore, 117549, Singapore
| | - Manfred E Beutel
- Department of Psychosomatic Medicine and Psychotherapy, University Medical Center Mainz, Mainz, 55131, Germany
| | - James F Wilson
- Institute of Genetics and Molecular Medicine, Medical Research Council Human Genetics Unit, University of Edinburgh, EH42XU, Edinburgh, UK
- Centre for Global Health Research, Usher Institute for Population Health Sciences and Informatics, University of Edinburgh, EH16 4UX, Edinburgh, UK
| | - André G Uitterlinden
- Department of Epidemiology, Erasmus Medical Center, 3000 CA, Rotterdam, The Netherlands
- Department of Internal Medicine, Erasmus Medical Center, 3000 CA, Rotterdam, The Netherlands
- Netherlands Consortium for Healthy Ageing, Netherlands Genomics Initiative, 2593 HW, The Hague, The Netherlands
| | - Eranga N Vithana
- Singapore Eye Research Institute, Singapore National Eye Centre, 168751, Singapore, Singapore
| | - Paul J Foster
- NIHR Biomedical Research Centre, Moorfields Eye Hospital NHS Foundation Trust and UCL Institute of Ophthalmology, EC1V 9EL, London, UK
| | - Pirro G Hysi
- Department of Twin Research and Genetic Epidemiology, King's College London, WC2R 2LS, London, UK
| | - Alex W Hewitt
- Centre for Eye Research Australia, University of Melbourne, Royal Victorian Eye and Ear Hospital, VIC 3002, East Melbourne, Australia
- School of Medicine, Menzies Institute for Medical Research, University of Tasmania, Hobart, TAS 7005, TAS, Australia
| | - Chiea Chuen Khor
- Genome Institute of Singapore, 60 Biopolis Street, Singapore, 138672, Singapore
| | - Louis R Pasquale
- Channing Division of Network Medicine, Brigham and Women's Hospital, Boston, MA 02115, MA, USA
- Department of Ophthalmology, Harvard Medical School and Massachusetts Eye and Ear Infirmary, Boston, MA 02114, MA, USA
| | - Grant W Montgomery
- Department of Genetics and Computational Biology, QIMR Berghofer Medical Research Institute, QLD 4029, Brisbane, Australia
- Institute for Molecular Bioscience, University of Queensland, QLD 4067, Brisbane, Australia
| | - Caroline C W Klaver
- Department of Ophthalmology, Erasmus Medical Center, 3000 CA, Rotterdam, The Netherlands
- Department of Epidemiology, Erasmus Medical Center, 3000 CA, Rotterdam, The Netherlands
- Department of Ophthalmology, Radboud University Medical Center, 6525 GA, Nijmegen, The Netherlands
| | - Tin Aung
- Singapore Eye Research Institute, Singapore National Eye Centre, 168751, Singapore, Singapore
- Ophthalmology & Visual Sciences Academic Clinical Program (Eye ACP), Duke-NUS Medical School, 169857, Singapore, Singapore
- Department of Ophthalmology, Yong Loo Lin School of Medicine, National University of Singapore, Singapore, 117549, Singapore
| | - Norbert Pfeiffer
- Department of Ophthalmology, University Medical Center Mainz, 55131, Mainz, Germany
| | - David A Mackey
- Centre for Ophthalmology and Visual Science, University of Western Australia, Lions Eye Institute, WA 6009, Perth, WA, Australia
| | - Christopher J Hammond
- Department of Twin Research and Genetic Epidemiology, King's College London, WC2R 2LS, London, UK
| | - Ching-Yu Cheng
- Singapore Eye Research Institute, Singapore National Eye Centre, 168751, Singapore, Singapore
- Ophthalmology & Visual Sciences Academic Clinical Program (Eye ACP), Duke-NUS Medical School, 169857, Singapore, Singapore
- Department of Ophthalmology, Yong Loo Lin School of Medicine, National University of Singapore, Singapore, 117549, Singapore
| | - Jamie E Craig
- Department of Ophthalmology, Flinders University, SA 5042, Adelaide, Australia
| | - Yaron S Rabinowitz
- Regenerative Medicine Institute and Department of Surgery, Cedars-Sinai Medical Center, CA 90048, Los Angeles, CA, USA
- Cornea Genetic Eye Institute, CA 90048, Los Angeles, CA, USA
| | - Janey L Wiggs
- Department of Ophthalmology, Harvard Medical School and Massachusetts Eye and Ear Infirmary, Boston, MA 02114, MA, USA
| | - Kathryn P Burdon
- Menzies Institute for Medical Research, University of Tasmania, Hobart, TAS 7005, TAS, Australia
| | - Cornelia M van Duijn
- Department of Epidemiology, Erasmus Medical Center, 3000 CA, Rotterdam, The Netherlands
| | - Stuart MacGregor
- Statistical Genetics, QIMR Berghofer Medical Research Institute, QLD 4029, Brisbane, Australia.
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Liskova P, Dudakova L, Evans CJ, Rojas Lopez KE, Pontikos N, Athanasiou D, Jama H, Sach J, Skalicka P, Stranecky V, Kmoch S, Thaung C, Filipec M, Cheetham ME, Davidson AE, Tuft SJ, Hardcastle AJ. Ectopic GRHL2 Expression Due to Non-coding Mutations Promotes Cell State Transition and Causes Posterior Polymorphous Corneal Dystrophy 4. Am J Hum Genet 2018; 102:447-459. [PMID: 29499165 PMCID: PMC5985340 DOI: 10.1016/j.ajhg.2018.02.002] [Citation(s) in RCA: 35] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/15/2017] [Accepted: 02/02/2018] [Indexed: 12/11/2022] Open
Abstract
In a large family of Czech origin, we mapped a locus for an autosomal-dominant corneal endothelial dystrophy, posterior polymorphous corneal dystrophy 4 (PPCD4), to 8q22.3-q24.12. Whole-genome sequencing identified a unique variant (c.20+544G>T) in this locus, within an intronic regulatory region of GRHL2. Targeted sequencing identified the same variant in three additional previously unsolved PPCD-affected families, including a de novo occurrence that suggests this is a recurrent mutation. Two further unique variants were identified in intron 1 of GRHL2 (c.20+257delT and c.20+133delA) in unrelated PPCD-affected families. GRHL2 is a transcription factor that suppresses epithelial-to-mesenchymal transition (EMT) and is a direct transcriptional repressor of ZEB1. ZEB1 mutations leading to haploinsufficiency cause PPCD3. We previously identified promoter mutations in OVOL2, a gene not normally expressed in the corneal endothelium, as the cause of PPCD1. OVOL2 drives mesenchymal-to-epithelial transition (MET) by directly inhibiting EMT-inducing transcription factors, such as ZEB1. Here, we demonstrate that the GRHL2 regulatory variants identified in PPCD4-affected individuals induce increased transcriptional activity in vitro. Furthermore, although GRHL2 is not expressed in corneal endothelial cells in control tissue, we detected GRHL2 in the corneal "endothelium" in PPCD4 tissue. These cells were also positive for epithelial markers E-Cadherin and Cytokeratin 7, indicating they have transitioned to an epithelial-like cell type. We suggest that mutations inducing MET within the corneal endothelium are a convergent pathogenic mechanism leading to dysfunction of the endothelial barrier and disease.
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Affiliation(s)
- Petra Liskova
- Research Unit for Rare Diseases, Department of Paediatrics and Adolescent Medicine, First Faculty of Medicine, Charles University and General University Hospital in Prague, Ke Karlovu 2, Prague 128 08, Czech Republic; Department of Ophthalmology, First Faculty of Medicine, Charles University and General University Hospital in Prague, U Nemocnice 2, Prague 128 08, Czech Republic; UCL Institute of Ophthalmology, University College London, London EC1V 9EL, UK.
| | - Lubica Dudakova
- Research Unit for Rare Diseases, Department of Paediatrics and Adolescent Medicine, First Faculty of Medicine, Charles University and General University Hospital in Prague, Ke Karlovu 2, Prague 128 08, Czech Republic
| | - Cerys J Evans
- UCL Institute of Ophthalmology, University College London, London EC1V 9EL, UK
| | - Karla E Rojas Lopez
- UCL Institute of Ophthalmology, University College London, London EC1V 9EL, UK
| | - Nikolas Pontikos
- UCL Institute of Ophthalmology, University College London, London EC1V 9EL, UK
| | - Dimitra Athanasiou
- UCL Institute of Ophthalmology, University College London, London EC1V 9EL, UK
| | - Hodan Jama
- UCL Institute of Ophthalmology, University College London, London EC1V 9EL, UK
| | - Josef Sach
- Institute of Pathology, Third Faculty of Medicine, Charles University, Faculty Hospital Kralovske Vinohrady, Srobarova 50, Prague 100 34, Czech Republic
| | - Pavlina Skalicka
- Research Unit for Rare Diseases, Department of Paediatrics and Adolescent Medicine, First Faculty of Medicine, Charles University and General University Hospital in Prague, Ke Karlovu 2, Prague 128 08, Czech Republic; Department of Ophthalmology, First Faculty of Medicine, Charles University and General University Hospital in Prague, U Nemocnice 2, Prague 128 08, Czech Republic
| | - Viktor Stranecky
- Research Unit for Rare Diseases, Department of Paediatrics and Adolescent Medicine, First Faculty of Medicine, Charles University and General University Hospital in Prague, Ke Karlovu 2, Prague 128 08, Czech Republic
| | - Stanislav Kmoch
- Research Unit for Rare Diseases, Department of Paediatrics and Adolescent Medicine, First Faculty of Medicine, Charles University and General University Hospital in Prague, Ke Karlovu 2, Prague 128 08, Czech Republic
| | - Caroline Thaung
- UCL Institute of Ophthalmology, University College London, London EC1V 9EL, UK; Moorfields Eye Hospital, London EC1V 2PD, UK
| | - Martin Filipec
- Department of Ophthalmology, First Faculty of Medicine, Charles University and General University Hospital in Prague, U Nemocnice 2, Prague 128 08, Czech Republic
| | - Michael E Cheetham
- UCL Institute of Ophthalmology, University College London, London EC1V 9EL, UK
| | - Alice E Davidson
- UCL Institute of Ophthalmology, University College London, London EC1V 9EL, UK
| | | | - Alison J Hardcastle
- UCL Institute of Ophthalmology, University College London, London EC1V 9EL, UK; Moorfields Eye Hospital, London EC1V 2PD, UK.
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Ben-Salem S, Robbins SM, Sobreira NLM, Lyon A, Al-Shamsi AM, Islam BK, Akawi NA, John A, Thachillath P, Hamed SA, Valle D, Ali BR, Al-Gazali L. Defect in phosphoinositide signalling through a homozygous variant in PLCB3 causes a new form of spondylometaphyseal dysplasia with corneal dystrophy. J Med Genet 2018; 55:122-130. [PMID: 29122926 PMCID: PMC8215682 DOI: 10.1136/jmedgenet-2017-104827] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/30/2017] [Revised: 09/19/2017] [Accepted: 10/06/2017] [Indexed: 02/05/2023]
Abstract
BACKGROUND Bone dysplasias are a large group of disorders affecting the growth and structure of the skeletal system. METHODS In the present study, we report the clinical and molecular delineation of a new form of syndromic autosomal recessive spondylometaphyseal dysplasia (SMD) in two Emirati first cousins. They displayed postnatal growth deficiency causing profound limb shortening with proximal and distal segments involvement, narrow chest, radiological abnormalities involving the spine, pelvis and metaphyses, corneal clouding and intellectual disability. Whole genome homozygosity mapping localised the genetic cause to 11q12.1-q13.1, a region spanning 19.32 Mb with ~490 genes. Using whole exome sequencing, we identified four novel homozygous variants within the shared block of homozygosity. Pathogenic variants in genes involved in phospholipid metabolism, such as PLCB4 and PCYT1A, are known to cause bone dysplasia with or without eye anomalies, which led us to select PLCB3 as a strong candidate. This gene encodes phospholipase C β 3, an enzyme that converts phosphatidylinositol 4,5 bisphosphate (PIP2) to inositol 1,4,5 triphosphate (IP3) and diacylglycerol. RESULTS The identified variant (c.2632G>T) substitutes a serine for a highly conserved alanine within the Ha2' element of the proximal C-terminal domain. This disrupts binding of the Ha2' element to the catalytic core and destabilises PLCB3. Here we show that this hypomorphic variant leads to elevated levels of PIP2 in patient fibroblasts, causing disorganisation of the F-actin cytoskeleton. CONCLUSIONS Our results connect a homozygous loss of function variant in PLCB3 with a new SMD associated with corneal dystrophy and developmental delay (SMDCD).
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Affiliation(s)
- Salma Ben-Salem
- Department of Pathology, College of Medicine and Heath Sciences, University Al-Ain, Al Ain, AbuDhabi, United Arab Emirates
| | - Sarah M Robbins
- Human genetics and Molecular Biology, Institute of Genetic Medicine, Johns Hopkins University School of Medicine, Baltimore, Maryland, USA
| | - Nara LM Sobreira
- Human genetics and Molecular Biology, Institute of Genetic Medicine, Johns Hopkins University School of Medicine, Baltimore, Maryland, USA
| | - Angeline Lyon
- Chemistry and Biological Sciences, West Lafayette, USA
| | - Aisha M Al-Shamsi
- Department of Paediatrics, Tawam Hospital, Al-Ain, United Arab Emirates
| | - Barira K Islam
- Department of Paediatrics, College of Medicine and Heath Sciences, United Arab Emirates University, Al Ain, United Arab Emirates
| | - Nadia A Akawi
- Division of Cardiovascular Medicine, John Radcliffe Hospital, University of Oxford, Oxford, Oxfordshire, UK
| | - Anne John
- Department of Pathology, College of Medicine and Heath Sciences, University Al-Ain, Al Ain, AbuDhabi, United Arab Emirates
| | - Pramathan Thachillath
- Department of Paediatrics, College of Medicine and Heath Sciences, United Arab Emirates University, Al Ain, United Arab Emirates
| | - Sania Al Hamed
- Department of Paediatrics, College of Medicine and Heath Sciences, United Arab Emirates University, Al Ain, United Arab Emirates
| | - David Valle
- Human genetics and Molecular Biology, Institute of Genetic Medicine, Johns Hopkins University School of Medicine, Baltimore, Maryland, USA
| | - Bassam R Ali
- Department of Pathology, College of Medicine and Heath Sciences, University Al-Ain, Al Ain, AbuDhabi, United Arab Emirates
| | - Lihadh Al-Gazali
- Department of Paediatrics, College of Medicine and Heath Sciences, United Arab Emirates University, Al Ain, United Arab Emirates
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Huerva V, Velasco A, Sánchez MC, Mateo AJ, Matías-Guiu X. Lattice Corneal Dystrophy Type II: Clinical, Pathologic, and Molecular Study in a Spanish Family. Eur J Ophthalmol 2018; 17:424-9. [PMID: 17534828 DOI: 10.1177/112067210701700326] [Citation(s) in RCA: 19] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
Abstract
PURPOSE To report a family with lattice corneal dystrophy type II (LCD II) associated with systemic amyloidosis type V. METHODS A 69-year-old woman presented a LCD II and marked dermachalasis. A lower blepharoplasty was performed. Two years later a penetrating keratoplasty was performed in her left eye. Three children of the patient were studied. Subtle manifestations of LCD were identified in two of them. Pathologic study of the excised skin and corneal button was made. DNA from peripheral blood was obtained, and was subjected to amplification of exon 5 of the gelsolin. RESULTS Pathologic examination of the skin of blepharoplasty specimen demonstrated the presence of amyloid. Microscopic examination of the corneal button showed the presence of amyloid deposits beneath the normal-appearing Bowman layer and also within the stroma. Immunostaining for S-100 protein did not demonstrate a significant relationship between amyloid deposits and corneal nerves. Electron microscopic evaluation demonstrated the presence of amyloid fibrils. No clear relationship was found between amyloid deposits and corneal nerves. These findings confirm LCD type II or Meretoja syndrome. A mutation analysis of the gelsolin gene demonstrated the presence of G to A transition at nucleotide 654. Two children with manifestations of LCD also showed the identical mutation in gelsolin gene. CONCLUSIONS A new family with Meretoja syndrome is reported. This is the first documented family with Meretoja syndrome in Spain and in the Mediterranean countries. The molecular study shows the same mutation of reported families from Finland, Japan, the United States, and the United Kingdom.
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Affiliation(s)
- V Huerva
- Ophthalmology Department, Universitary Hospital Arnau de Vilanova, IRB Lleida, University of Lleida, Lleida, Spain.
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Mustonen T, Schmidt EK, Valori M, Tienari PJ, Atula S, Kiuru-Enari S. Common origin of the gelsolin gene variant in 62 Finnish AGel amyloidosis families. Eur J Hum Genet 2018; 26:117-123. [PMID: 29167514 PMCID: PMC5838978 DOI: 10.1038/s41431-017-0026-x] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/06/2017] [Revised: 10/03/2017] [Accepted: 10/10/2017] [Indexed: 12/23/2022] Open
Abstract
Finnish gelsolin amyloidosis (AGel amyloidosis) is an autosomal dominantly inherited systemic disorder with ophthalmologic, neurologic and dermatologic symptoms. Only the gelsolin (GSN) c.640G>A variant has been found in the Finnish patients thus far. The purpose of this study was to examine whether the Finnish patients have a common ancestor or whether multiple mutation events have occurred at c.640G, which is a known mutational hot spot. A total of 79 Finnish AGel amyloidosis families including 707 patients were first discovered by means of patient interviews, genealogic studies and civil and parish registers. From each family 1-2 index patients were chosen. Blood samples were available from 71 index patients representing 64 families. After quality control, SNP array genotype data were available from 68 patients from 62 nuclear families. All the index patients had the same c.640G>A variant (rs121909715). Genotyping was performed using the Illumina CoreExome SNP array. The homozygosity haplotype method was used to analyse shared haplotypes. Haplotype analysis identified a shared haplotype, common to all studied patients. This shared haplotype included 17 markers and was 361 kb in length (GRCh37 coordinates 9:124003326-124364349) and this level of haplotype sharing was found to occur highly unlikely by chance. This GSN haplotype ranked as the largest shared haplotype in the 68 patients in a genome-wide analysis of haplotype block lengths. These results provide strong evidence that although there is a known mutational hot spot at GSN c.640G, all of the studied 62 Finnish AGel amyloidosis families are genetically linked to a common ancestor.
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Affiliation(s)
- Tuuli Mustonen
- Faculty of Medicine, University of Helsinki, Helsinki, Finland
| | | | - Miko Valori
- Molecular Neurology, Research Programs Unit, University of Helsinki, Helsinki, Finland
- Helsinki University Hospital, Department of Neurology, Helsinki, Finland
| | - Pentti J Tienari
- Molecular Neurology, Research Programs Unit, University of Helsinki, Helsinki, Finland
- Helsinki University Hospital, Department of Neurology, Helsinki, Finland
| | - Sari Atula
- Helsinki University Hospital, Department of Neurology, Helsinki, Finland
- Clinical Neurosciences, Neurology, University of Helsinki, Helsinki, Finland
| | - Sari Kiuru-Enari
- Clinical Neurosciences, Neurology, University of Helsinki, Helsinki, Finland
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Chao-Shern C, Me R, DeDionisio LA, Ke BL, Nesbit MA, Marshall J, Moore CBT. Post-LASIK exacerbation of granular corneal dystrophy type 2 in members of a chinese family. Eye (Lond) 2018; 32:39-43. [PMID: 29192679 PMCID: PMC5770725 DOI: 10.1038/eye.2017.265] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/23/2017] [Accepted: 10/22/2017] [Indexed: 11/09/2022] Open
Abstract
PurposeThe post-LASIK exacerbation of corneal dystrophy, otherwise asymptomatic, is almost exclusively associated with the TGFBI gene mutations at codon 124 in exon 4 and codon 555 in exon 12. It is our intention to demonstrate that the pre-operative genetic screening for TGFBI mutations should be mandatory for refractive surgery candidates.Patients and MethodsIn this study, we reviewed the proband's post-LASIK slit-lamp and in vivo confocal microscopy images and genetic testing results, and performed genetic testing on eleven additional members of the family to investigate the penetrance of corneal dystrophy in asymptomatic members who carry the mutation.ResultsThe proband demonstrated a post-LASIK exacerbation of Granular Corneal Dystrophy type 2 (GCD2), identified as a TGFBI R124H mutation. Three of the 11 family members tested positive for the same R124H mutation as the proband.ConclusionThe lesson learned from this case is that the genetic screening of TGFBI mutations must be incorporated into the pre-operative screening procedures to prevent exacerbation and recurrence, which eventually could lead to the need for a corneal transplant.
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Affiliation(s)
- C Chao-Shern
- Biomedical Sciences Research Institute, University of Ulster, Coleraine, Northern Ireland, UK
- Avellino Lab USA, Inc., Menlo Park, CA, USA
| | - R Me
- Department of Ophthalmology, Shanghai First People's Hospital, Shanghai Jiaotong University School of Medicine, Shanghai, China
| | | | - B L Ke
- Department of Ophthalmology, Shanghai First People's Hospital, Shanghai Jiaotong University School of Medicine, Shanghai, China
| | - M A Nesbit
- Biomedical Sciences Research Institute, University of Ulster, Coleraine, Northern Ireland, UK
| | - J Marshall
- Institute of Ophthalmology, University College of London, London, UK
| | - C B T Moore
- Biomedical Sciences Research Institute, University of Ulster, Coleraine, Northern Ireland, UK
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Guan T, Zhang L, Xu D, Wu H, Zheng L. [Analysis of TGFBI gene mutation in a Chinese family affected with Reis-Bucklers corneal dystrophy]. Zhonghua Yi Xue Yi Chuan Xue Za Zhi 2017; 34:629-632. [PMID: 28981920 DOI: 10.3760/cma.j.issn.1003-9406.2017.05.001] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
OBJECTIVE To analyze the clinical features and TGFBI gene mutation in a Chinese family affected with Reis-Bucklers corneal dystrophy. METHODS Genomic DNA was extracted from 53 members including 9 patients from the family. The 17 exons and splice region of introns of the TGFBI gene were amplified by PCR and directly sequenced. All family members were subjected to ophthalmologic examination. RESULTS A heterozygous mutation (R124L) was found in exon 4 of the TGFBI gene among all patients from the family. The same mutation was not found among unaffected family members. The inheritance pattern of the family was identified as autosomal dominant, and the Reis-Bucklers corneal dystrophy in the family was diagnosed as the geographic type. CONCLUSION The R124L mutation of the TGFBI gene probably underlies the pathogenesis of Reis-Bucklers corneal dystrophy in this Chinese family. Molecular genetic approach is useful for the proper diagnosis of this type of corneal dystrophy.
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Affiliation(s)
- Tao Guan
- Department of Ophthalmology, Taizhou Municipal Hospital, Taizhou, Zhejiang 318000, China.
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Abstract
Retinal phenotypes of the PPCD1 mouse, a mouse model of posterior polymorphous corneal dystrophy, have been characterized. PPCD1 mice on the DBA/2J background (D2.Ppcd1) have previously been reported to develop an enlarged anterior chamber due to epithelialization and proliferation of the corneal endothelium and subsequent blockage of the iridocorneal angle. Results presented here show that D2.Ppcd1 mice develop increased intraocular pressure (IOP), with measurements at three months of age revealing significant increases in IOP. Significant retinal ganglion cell layer cell loss is observed at five months of age. D2.Ppcd1 animals also exhibit marked degeneration of the outer nuclear layer in association with hyperplasia of the retinal pigment epithelium. Evidence of retinal detachment is present as early as three weeks of age. By 3.5 months of age, focal areas of outer nuclear layer loss are observed. Although the GpnmbR150X mutation leads to increased IOP and glaucoma in DBA/2J mice, development of anterior segment and retinal defects in D2.Ppcd1 animals does not depend upon presence of the GpnmbR150X mutation.
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Affiliation(s)
- Anna L. Shen
- The McArdle Laboratory for Cancer Research, Department of Oncology, School of Medicine and Public Health, University of Wisconsin-Madison, Madison, Wisconsin, United States of America
- McPherson Eye Research Institute, University of Wisconsin-Madison, Madison, Wisconsin, United States of America
- * E-mail: (CAB); (ALS)
| | - Susan M. Moran
- The McArdle Laboratory for Cancer Research, Department of Oncology, School of Medicine and Public Health, University of Wisconsin-Madison, Madison, Wisconsin, United States of America
| | - Edward A. Glover
- The McArdle Laboratory for Cancer Research, Department of Oncology, School of Medicine and Public Health, University of Wisconsin-Madison, Madison, Wisconsin, United States of America
| | - Leandro B. Teixeira
- McPherson Eye Research Institute, University of Wisconsin-Madison, Madison, Wisconsin, United States of America
- Department of Pathobiological Sciences, School of Veterinary Medicine, University of Wisconsin-Madison, Madison, Wisconsin, United States of America
| | - Christopher A. Bradfield
- The McArdle Laboratory for Cancer Research, Department of Oncology, School of Medicine and Public Health, University of Wisconsin-Madison, Madison, Wisconsin, United States of America
- McPherson Eye Research Institute, University of Wisconsin-Madison, Madison, Wisconsin, United States of America
- Wisconsin Institute for Discovery, University of Wisconsin-Madison, Madison, Wisconsin, United States of America
- * E-mail: (CAB); (ALS)
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Venkatraman A, Dutta B, Murugan E, Piliang H, Lakshminaryanan R, Sook Yee AC, Pervushin KV, Sze SK, Mehta JS. Proteomic Analysis of Amyloid Corneal Aggregates from TGFBI-H626R Lattice Corneal Dystrophy Patient Implicates Serine-Protease HTRA1 in Mutation-Specific Pathogenesis of TGFBIp. J Proteome Res 2017; 16:2899-2913. [PMID: 28689406 DOI: 10.1021/acs.jproteome.7b00188] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
TGFBI-associated corneal dystrophies are inherited disorders caused by TGFBI gene variants that promote deposition of mutant protein (TGFBIp) as insoluble aggregates in the cornea. Depending on the type and position of amino acid substitution, the aggregates may be amyloid fibrillar, amorphous globular or both, but the molecular mechanisms that drive these different patterns of aggregation are not fully understood. In the current study, we report the protein composition of amyloid corneal aggregates from lattice corneal dystrophy patients of Asian origin with H626R and R124C mutation and compared it with healthy corneal tissues via LC-MS/MS. We identified several amyloidogenic, nonfibrillar amyloid associated proteins and TGFBIp as the major components of the deposits. Our data indicates that apolipoprotein A-IV, apolipoprotein E, and serine protease HTRA1 were significantly enriched in patient deposits compared to healthy controls. HTRA1 was also found to be 7-fold enriched in the amyloid deposits of patients compared to the controls. Peptides sequences (G511DNRFSMLVAAIQSAGLTETLNR533 and Y571HIGDEILVSGGIGALVR588) derived from the fourth FAS-1 domain of TGFBIp were enriched in the corneal aggregates in a mutation-specific manner. Biophysical studies of these two enriched sequences revealed high propensity to form amyloid fibrils under physiological conditions. Our data suggests a possible proteolytic processing mechanism of mutant TGFBIp by HTRA1 and peptides generated by mutant protein may form the β-amyloid core of corneal aggregates in dystrophic patients.
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Affiliation(s)
- Anandalakshmi Venkatraman
- Singapore Eye Research Institute , 11 Third Hospital Avenue, Singapore 168751
- School of Biological Sciences, Nanyang Technological University , Singapore 637551
| | - Bamaprasad Dutta
- School of Biological Sciences, Nanyang Technological University , Singapore 637551
| | - Elavazhagan Murugan
- Singapore Eye Research Institute , 11 Third Hospital Avenue, Singapore 168751
- Duke-NUS Graduate Medical School , Singapore 169857
| | - Hao Piliang
- School of Biological Sciences, Nanyang Technological University , Singapore 637551
| | - Rajamani Lakshminaryanan
- Singapore Eye Research Institute , 11 Third Hospital Avenue, Singapore 168751
- Duke-NUS Graduate Medical School , Singapore 169857
| | - Anita Chan Sook Yee
- Singapore National Eye Centre , 11 Third Hospital Avenue, Singapore 168751
- Department of Pathology, Singapore General Hospital , Singapore 169608
- Duke-NUS Graduate Medical School , Singapore 169857
| | | | - Siu Kwan Sze
- School of Biological Sciences, Nanyang Technological University , Singapore 637551
| | - Jodhbir S Mehta
- Singapore Eye Research Institute , 11 Third Hospital Avenue, Singapore 168751
- Department of Pathology, Singapore General Hospital , Singapore 169608
- Duke-NUS Graduate Medical School , Singapore 169857
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Lee J, Ji YW, Park SY, Seo KY, Kim TI, Kim EK. Delayed Onset of Lattice Corneal Dystrophy Type IIIA Due to a Novel T621P Mutation in TGFBI. J Refract Surg 2017; 32:356. [PMID: 27163623 DOI: 10.3928/1081597x-20160225-01] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
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Zeng L, Zhao J, Chen Y, Zhao F, Li M, Chao-Shern C, Moore T, Marshall J, Zhou X. TGFBI Gene Mutation Analysis of Clinically Diagnosed Granular Corneal Dystrophy Patients Prior to PTK: A Pilot Study from Eastern China. Sci Rep 2017; 7:596. [PMID: 28377594 PMCID: PMC5429662 DOI: 10.1038/s41598-017-00716-5] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/16/2016] [Accepted: 03/10/2017] [Indexed: 11/09/2022] Open
Abstract
This study investigated the TGFBI gene mutation types in outpatients clinically diagnosed with granular corneal dystrophy (GCD) prior to phototherapeutic keratectomy (PTK), also calculated the mutation rate of subjects with normal corneas, but positive family history. Clinical GCD outpatients and consanguineous family members were enrolled in this study. Among total 42 subjects: 24 patients from 23 unrelated families had typical signs of GCD on corneas; 5 patients from 5 unrelated families had atypical signs; 13 subjects from 11 unrelated families had no corneal signs but positive family history. Using Avellino gene test kit, the TGFBI mutation detection was performed on DNA samples from all subjects. 36 subjects were detected to carry heterozygous TGFBI gene mutations. Among 24 clinical GCD patients, the proportion of R124H, R555Q, R124L, R555W and R124C were 37.5%, 16.7%, 25.0%, 20.8% and 0%, respectively, and 2 patients had been diagnosed with GCD according to the opacities thriving after LASIK (R124H) and PRK (R555W). The mutation rate of 13 subjects having no signs but positive family history was 69.2%. R124H mutation is the most prominent mutation type among GCD outpatients in Eastern China. It is recommended to conduct gene detection for patients with positive family history prior to refractive surgeries.
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Affiliation(s)
- Li Zeng
- Eye and ENT Hospital of Fudan University, Myopia Key Laboratory of China Health Ministry, Shanghai, China
| | - Jing Zhao
- Eye and ENT Hospital of Fudan University, Myopia Key Laboratory of China Health Ministry, Shanghai, China
| | - Yingjun Chen
- Eye and ENT Hospital of Fudan University, Myopia Key Laboratory of China Health Ministry, Shanghai, China
| | - Feng Zhao
- Eye and ENT Hospital of Fudan University, Myopia Key Laboratory of China Health Ministry, Shanghai, China
| | - Meiyan Li
- Eye and ENT Hospital of Fudan University, Myopia Key Laboratory of China Health Ministry, Shanghai, China
| | | | | | | | - Xingtao Zhou
- Eye and ENT Hospital of Fudan University, Myopia Key Laboratory of China Health Ministry, Shanghai, China.
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Pan X, Wang Y, Lübke T, Hinek A, Pshezhetsky AV. Mice, double deficient in lysosomal serine carboxypeptidases Scpep1 and Cathepsin A develop the hyperproliferative vesicular corneal dystrophy and hypertrophic skin thickenings. PLoS One 2017; 12:e0172854. [PMID: 28234994 PMCID: PMC5325571 DOI: 10.1371/journal.pone.0172854] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/25/2016] [Accepted: 01/17/2017] [Indexed: 01/04/2023] Open
Abstract
Vasoactive and mitogenic peptide, endothelin-1 (ET-1) plays an important role in physiology of the ocular tissues by regulating the growth of corneal epithelial cells and maintaining the hemodynamics of intraocular fluids. We have previously established that ET-1 can be degraded in vivo by two lysosomal/secreted serine carboxypeptidases, Cathepsin A (CathA) and Serine Carboxypeptidase 1 (Scpep1) and that gene-targeted CathAS190A/Scpep1-/- mice, deficient in CathA and Scpep1 have a prolonged half-life of circulating ET-1 associated with systemic hypertension. In the current work we report that starting from 6 months of age, ~43% of CathAS190A/Scpep1-/- mice developed corneal clouding that eventually caused vision impairment. Histological evaluation of these mice demonstrated a selective fibrotic thickening and vacuolization of the corneas, resembling human hyperproliferative vesicular corneal stromal dystrophy and coexisting with a peculiar thickening of the skin epidermis. Moreover, we found that cultured corneal epithelial cells, skin fibroblasts and vascular smooth muscle cells derived from CathA/Scpep1-deficient mice, demonstrated a significantly higher proliferative response to treatment with exogenous ET-1, as compared with cells from wild type mice. We also detected increased activation level of ERK1/2 and AKT kinases involved in cell proliferation in the ET-1-treated cultured cells from CathA/Scpep1 deficient mice. Together, results from our experimental model suggest that; in normal tissues the tandem of serine carboxypeptidases, Scpep1 and CathA likely constitutes an important part of the physiological mechanism responsible for the balanced elimination of heightened levels of ET-1 that otherwise would accumulate in tissues and consequently contribute to development of the hyper-proliferative corneal dystrophy and abnormal skin thickening.
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Affiliation(s)
- Xuefang Pan
- Department of Medical Genetics, CHU Sainte-Justine Research Center, University of Montreal, Montreal, Quebec, Canada
| | - Yanting Wang
- Cardiovascular Research Program, the Hospital for Sick Children and Department of Laboratory Medicine and Pathobiology, University of Toronto, Ontario, Canada
| | - Torben Lübke
- Department of Chemistry, Biochemistry I, Bielefeld University, Bielefeld, Germany
| | - Aleksander Hinek
- Cardiovascular Research Program, the Hospital for Sick Children and Department of Laboratory Medicine and Pathobiology, University of Toronto, Ontario, Canada
| | - Alexey V. Pshezhetsky
- Department of Medical Genetics, CHU Sainte-Justine Research Center, University of Montreal, Montreal, Quebec, Canada
- Department of Anatomy and Cell Biology, Faculty of Medicine, McGill University, Montreal, Quebec, Canada
- * E-mail:
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Chung DD, Frausto RF, Cervantes AE, Gee KM, Zakharevich M, Hanser EM, Stone EM, Heon E, Aldave AJ. Confirmation of the OVOL2 Promoter Mutation c.-307T>C in Posterior Polymorphous Corneal Dystrophy 1. PLoS One 2017; 12:e0169215. [PMID: 28046031 PMCID: PMC5207508 DOI: 10.1371/journal.pone.0169215] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/04/2016] [Accepted: 12/13/2016] [Indexed: 01/28/2023] Open
Abstract
Purpose To identify the genetic basis of posterior polymorphous corneal dystrophy (PPCD) in families mapped to the PPCD1 locus and in affected individuals without ZEB1 coding region mutations. Methods The promoter, 5’ UTR, and coding regions of OVOL2 was screened in the PPCD family in which linkage analysis established the PPCD1 locus and in 26 PPCD probands who did not harbor a ZEB1 mutation. Copy number variation (CNV) analysis in the PPCD1 and PPCD3 intervals was performed on DNA samples from eight probands using aCGH. Luciferase reporter assays were performed in human corneal endothelial cells to determine the impact of the identified potentially pathogenic variants on OVOL2 promoter activity. Results OVOL2 mutation analysis in the first PPCD1-linked family demonstrated segregation of the c.-307T>C variant with the affected phenotype. In the other 26 probands screened, one heterozygous coding region variant and five promoter region heterozygous variants were identified, though none are likely pathogenic based on allele frequency. Array CGH in the PPCD1 and PPCD3 loci excluded the presence of CNV involving either OVOL2 or ZEB1, respectively. The c.-307T>C variant demonstrated increased promoter activity in corneal endothelial cells when compared to the wild-type sequence as has been demonstrated previously in another cell type. Conclusions Previously identified as the cause of PPCD1, the OVOL2 promoter variant c.-307T>C was herein identified in the original family that established the PPCD1 locus. However, the failure to identify presumed pathogenic coding or non-coding OVOL2 or ZEB1 variants, or CNV involving the PPCD1 and PPCD3 loci in 26 other PPCD probands suggests that other genetic loci may be involved in the pathogenesis of PPCD.
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Affiliation(s)
- Doug D. Chung
- Stein Eye Institute, David Geffen School of Medicine at the University of California Los Angeles, Los Angeles, California, United States of America
| | - Ricardo F. Frausto
- Stein Eye Institute, David Geffen School of Medicine at the University of California Los Angeles, Los Angeles, California, United States of America
| | - Aleck E. Cervantes
- Stein Eye Institute, David Geffen School of Medicine at the University of California Los Angeles, Los Angeles, California, United States of America
| | - Katherine M. Gee
- Stein Eye Institute, David Geffen School of Medicine at the University of California Los Angeles, Los Angeles, California, United States of America
| | - Marina Zakharevich
- Stein Eye Institute, David Geffen School of Medicine at the University of California Los Angeles, Los Angeles, California, United States of America
| | - Evelyn M. Hanser
- Stein Eye Institute, David Geffen School of Medicine at the University of California Los Angeles, Los Angeles, California, United States of America
| | - Edwin M. Stone
- Department of Ophthalmology, University of Iowa Carver College of Medicine, Iowa City, Iowa, United States of America
| | - Elise Heon
- Department of Ophthalmology and Vision Sciences, The Hospital for Sick Children, University of Toronto, Toronto, Ontario, Canada
| | - Anthony J. Aldave
- Stein Eye Institute, David Geffen School of Medicine at the University of California Los Angeles, Los Angeles, California, United States of America
- * E-mail:
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78
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Abstract
PURPOSE This study reports the presentation of 2 families with macular corneal dystrophy (MCD). The aim of this study was to show whether ultrasound biomicroscopy (UBM) can, based on posterior changes of the cornea in MCD, assist in the choice of surgery, either anterior lamellar keratoplasty (DALK) or penetrating keratoplasty (PK), compared with optical coherence tomography (OCT) and Scheimpflug. METHODS Six patients with MCD were examined for their best-corrected visual acuity, slit-lamp, OCT, UBM, and Scheimpflug findings. Blood samples for DNA and exons of the CHST6 gene were screened for mutations. RESULTS All 6 patients showed typical MCD signs at the slit lamp. Corneal transplantation was required in 2 patients in both eyes. Recurrence of MCD was observed in 2 eyes after the DALK procedure (patient A5, age 48 years, right eye and B1, 51 years, left eye), whereas the 2 eyes after PK (patient A5, age 48 years, left eye and patient B1, 51 years, right eye) remained clear (for 10 years of follow-up in patient A5 and 4 years in patient B1). In 2 patients (A1 and A3), corneal thinning could be evaluated by OCT. In 3 patients (A2, 3, and 4), UBM disclosed deeper pathologies including opacities, loss of continuity, and focal protrusions of the posterior cornea, which were not evident by other devices. In family A, a novel mutation was identified. CONCLUSIONS Our UBM examination of MCD shows alterations of the cornea's posterior layer and confirms the known clinical and histological findings of MCD that PK represents the therapy of choice, contrary to DALK. The novel CHST6 mutation shows the heterogeneity of MCD.
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Affiliation(s)
- Yair Rubinstein
- *The Matlow's Ophthalmo-Genetics Laboratory, Department of Ophthalmology, Assaf-Harofeh Medical Center, Zerifin, Israel;†Department of Ophthalmology, Assaf Harofeh Medical Center, Zerifin, Israel, affiliated to the Sackler Faculty of Medicine, Tel Aviv University, Tel Aviv, Israel; and‡Department of Ophthalmology, Sackler Faculty of Medicine, Tel Aviv University, Tel Aviv, Israel
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Lee KY, Park SY, Lee T, Lee BR, Kim T, Kim EK. The Value of Reliable Genetic Testing in Refractive Surgery Candidates. J Refract Surg 2016; 32:860-861. [PMID: 27930799 DOI: 10.3928/1081597x-20160923-01] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
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Tetas Pont R, Downs L, Pettitt L, Busse C, Mellersh CS. A Carbohydrate Sulfotransferase-6 (CHST6) gene mutation is associated with Macular Corneal Dystrophy in Labrador Retrievers. Vet Ophthalmol 2016; 19:488-492. [PMID: 26585178 DOI: 10.1111/vop.12332] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2023]
Abstract
PURPOSE To locate and identify variants associated with macular corneal dystrophy (MCD) in Labrador Retriever (LR) dogs, in the candidate gene carbohydrate sulfotransferase-6 (CHST6). METHODS The single coding exon of canine CHST6 was sequenced in one affected LR with MCD and one control LR clinically clear of ocular disease. A further 71 control LR with unknown clinical status were sequenced for the putative causal variant in CHST6. A TaqMan SNP genotyping assay was developed and used to screen an additional 84 dogs (five affected LR and 79 clinically clear LR). Finally, the variant was screened in a third cohort of 89 unrelated LR with unknown clinical status to estimate its allele frequency in the population of LR in the United Kingdom. RESULTS A single nucleotide polymorphism (SNP) was identified within the coding exon of CHST6, resulting in a missense mutation (c.814C>A, p.R272S). All six LR affected with MCD were homozygous for the mutant allele, while 140/151 control LR were homozygous for the wild-type allele and 11/151 were heterozygous for the mutation, indicating an association with MCD (P < 10-5 ). The mutant allele was present in the unrelated LR cohort at a frequency of 0.017, suggesting carrier and affection rates of 3.3% and 0.028%, respectively. CONCLUSIONS A missense mutation in the CHST6 gene is strongly associated with autosomal recessive MCD in the LR.
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Affiliation(s)
- Roser Tetas Pont
- Comparative Ophthalmology Unit, Animal Health Trust, Lanwades Park, Kentford, CB8 7UU, UK.
| | - Louise Downs
- Canine Genetics, Animal Health Trust, Lanwades Park, Kentford, CB8 7UU, UK
| | - Louise Pettitt
- Canine Genetics, Animal Health Trust, Lanwades Park, Kentford, CB8 7UU, UK
| | - Claudia Busse
- Comparative Ophthalmology Unit, Animal Health Trust, Lanwades Park, Kentford, CB8 7UU, UK
| | - Cathryn S Mellersh
- Canine Genetics, Animal Health Trust, Lanwades Park, Kentford, CB8 7UU, UK
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Yaylacioglu Tuncay F, Kayman Kurekci G, Guntekin Ergun S, Pasaoglu OT, Akata RF, Dincer PR. Genetic analysis of CHST6 and TGFBI in Turkish patients with corneal dystrophies: Five novel variations in CHST6. Mol Vis 2016; 22:1267-1279. [PMID: 27829782 PMCID: PMC5082643] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/15/2016] [Accepted: 10/24/2016] [Indexed: 12/04/2022] Open
Abstract
PURPOSE To identify pathogenic variations in carbohydrate sulfotransferase 6 (CHST6) and transforming growth factor, beta-induced (TGFBI) genes in Turkish patients with corneal dystrophy (CD). METHODS In this study, patients with macular corneal dystrophy (MCD; n = 18), granular corneal dystrophy type 1 (GCD1; n = 12), and lattice corneal dystrophy type 1 (LCD1; n = 4), as well as 50 healthy controls, were subjected to clinical and genetic examinations. The level of antigenic keratan sulfate (AgKS) in the serum samples of patients with MCD was determined with enzyme-linked immunosorbent assay (ELISA) to immunophenotypically subtype the patients as MCD type I and MCD type II. DNA was isolated from venous blood samples from the patients and controls. Variations were analyzed with DNA sequencing in the coding region of CHST6 in patients with MCD and exons 4 and 12 in TGFBI in patients with LCD1 and GCD1. Clinical characteristics and the detected variations were evaluated to determine any existing genotype-phenotype correlations. RESULTS The previously reported R555W mutation in TGFBI was detected in 12 patients with GCD1, and the R124C mutation in TGFBI was detected in four patients with LCD1. Serum AgKS levels indicated that 12 patients with MCD were in subgroup I, and five patients with MCD were in subgroup II. No genetic variation was detected in the coding region of CHST6 for three patients with MCD type II. In other patients with MCD, three previously reported missense variations (c. 1A>T, c.738C>G, and c.631 C>T), three novel missense variations (c.164 T>C, c.526 G>A, c. 610 C>T), and two novel frameshift variations (c.894_895 insG and c. 462_463 delGC) were detected. These variations did not exist in the control chromosomes, 1000 Genomes, and dbSNP. CONCLUSIONS This is the first molecular analysis of TGFBI and CHST6 in Turkish patients with different types of CD. We detected previously reported, well-known hot spot mutations in TGFBI in the patients with GCD1 and LCD1. Eight likely pathogenic variations in CHST6, five of them novel, were reported in patients with MCD, which enlarges the mutational spectrum of MCD.
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Affiliation(s)
- Fulya Yaylacioglu Tuncay
- Polatlı Duatepe State Hospital, Ophthalmology Department, Ankara. Turkey; Hacettepe Faculty of Medicine, Medical Biology Department, Ankara, Turkey
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Chung DWD, Frausto RF, Chiu S, Lin BR, Aldave AJ. Investigating the Molecular Basis of PPCD3: Characterization of ZEB1 Regulation of COL4A3 Expression. Invest Ophthalmol Vis Sci 2016; 57:4136-43. [PMID: 27537263 PMCID: PMC4991021 DOI: 10.1167/iovs.16-19533] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/09/2016] [Accepted: 06/06/2016] [Indexed: 12/13/2022] Open
Abstract
PURPOSE To investigate the role of the zinc finger e-box binding homeobox 1 (ZEB1) transcription factor in posterior polymorphous corneal dystrophy 3 by demonstrating its ability to regulate type IV collagen gene transcription via binding to putative E2 box motifs. METHODS Putative E2 box motifs were identified by in silico analysis within the promoter region of collagen, type IV, alpha3 (COL4A3) and collagen, type IV, alpha4 (COL4A4). To test the ability of ZEB1 to bind to each identified E2 box, electrophoretic mobility shift assays were performed by incubating ZEB1-enriched nuclear extracts with DIG-labeled probes containing one of each of the identified E2 box motifs. Dual-luciferase reporter assays were performed to test the effects of ZEB1 on the luciferase activity of COL4A3 and cadherin 1 (CDH1) promoter constructs, and to determine the effect of a ZEB1 truncating mutation on CDH1 promoter activity. RESULTS ZEB1 exhibited binding to six of the nine COL4A3 E2 box probes, whereas no binding was observed for either of the two COL4A4 E2 box probes. ZEB1 overexpression resulted in reduced activity of the COL4A3 promoter construct containing all identified E2 box motifs, whereas a truncating ZEB1 mutation led to the loss of ZEB1-dependent repression of the CDH1 promoter. CONCLUSIONS COL4A3 gene expression is negatively regulated by ZEB1 binding to E2 box motifs in the COL4A3 promoter region. Therefore, the altered expression of type IV collagens, particularly COL4A3, in the corneal endothelium in individuals with PPCD3 is likely due to reduced transcriptional repression in the setting of a single functional ZEB1 allele.
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Affiliation(s)
- Duk-Won D. Chung
- Stein Eye Institute David Geffen School of Medicine at UCLA, Los Angeles, California, United States
| | - Ricardo F. Frausto
- Stein Eye Institute David Geffen School of Medicine at UCLA, Los Angeles, California, United States
| | - Stephan Chiu
- Stein Eye Institute David Geffen School of Medicine at UCLA, Los Angeles, California, United States
| | - Benjamin R. Lin
- Stein Eye Institute David Geffen School of Medicine at UCLA, Los Angeles, California, United States
| | - Anthony J. Aldave
- Stein Eye Institute David Geffen School of Medicine at UCLA, Los Angeles, California, United States
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Carstens N, Williams S, Goolam S, Carmichael T, Cheung MS, Büchmann-Møller S, Sultan M, Staedtler F, Zou C, Swart P, Rice DS, Lacoste A, Paes K, Ramsay M. Novel mutation in the CHST6 gene causes macular corneal dystrophy in a black South African family. BMC Med Genet 2016; 17:47. [PMID: 27439461 PMCID: PMC4955246 DOI: 10.1186/s12881-016-0308-0] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 08/06/2015] [Accepted: 06/23/2016] [Indexed: 12/30/2022]
Abstract
BACKGROUND Macular corneal dystrophy (MCD) is a rare autosomal recessive disorder that is characterized by progressive corneal opacity that starts in early childhood and ultimately progresses to blindness in early adulthood. The aim of this study was to identify the cause of MCD in a black South African family with two affected sisters. METHODS A multigenerational South African Sotho-speaking family with type I MCD was studied using whole exome sequencing. Variant filtering to identify the MCD-causal mutation included the disease inheritance pattern, variant minor allele frequency and potential functional impact. RESULTS Ophthalmologic evaluation of the cases revealed a typical MCD phenotype and none of the other family members were affected. An average of 127 713 variants per individual was identified following exome sequencing and approximately 1.2 % were not present in any of the investigated public databases. Variant filtering identified a homozygous E71Q mutation in CHST6, a known MCD-causing gene encoding corneal N-acetyl glucosamine-6-O-sulfotransferase. This E71Q mutation results in a non-conservative amino acid change in a highly conserved functional domain of the human CHST6 that is essential for enzyme activity. CONCLUSION We identified a novel E71Q mutation in CHST6 as the MCD-causal mutation in a black South African family with type I MCD. This is the first description of MCD in a black Sub-Saharan African family and therefore contributes valuable insights into the genetic aetiology of this disease, while improving genetic counselling for this and potentially other MCD families.
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Affiliation(s)
- Nadia Carstens
- />Sydney Brenner Institute for Molecular Bioscience, University of the Witwatersrand, 2050 Johannesburg, Gauteng South Africa
| | - Susan Williams
- />Division of Ophthalmology, Department of Neurosciences, University of the Witwatersrand, Johannesburg, South Africa
| | - Saadiah Goolam
- />Division of Ophthalmology, Department of Neurosciences, University of the Witwatersrand, Johannesburg, South Africa
| | - Trevor Carmichael
- />Division of Ophthalmology, Department of Neurosciences, University of the Witwatersrand, Johannesburg, South Africa
| | - Ming Sin Cheung
- />Biomarker Development, Novartis Institutes for BioMedical Research, Basel, Switzerland
| | - Stine Büchmann-Møller
- />Biomarker Development, Novartis Institutes for BioMedical Research, Basel, Switzerland
| | - Marc Sultan
- />Biomarker Development, Novartis Institutes for BioMedical Research, Basel, Switzerland
| | - Frank Staedtler
- />Biomarker Development, Novartis Institutes for BioMedical Research, Basel, Switzerland
| | - Chao Zou
- />Center for Proteomic Chemistry, Novartis Institutes for BioMedical Research, Basel, Switzerland
| | - Peter Swart
- />Division of Anatomical Pathology, National Health Laboratory Services and University of the Witwatersrand, Johannesburg, South Africa
| | - Dennis S. Rice
- />Novartis Institutes for Biomedical Research, Cambridge, USA
| | - Arnaud Lacoste
- />Novartis Institutes for Biomedical Research, Cambridge, USA
| | - Kim Paes
- />Novartis Institutes for Biomedical Research, Cambridge, USA
| | - Michèle Ramsay
- />Sydney Brenner Institute for Molecular Bioscience, University of the Witwatersrand, 2050 Johannesburg, Gauteng South Africa
- />Division of Human Genetics, National Health Laboratory Service and Faculty of Health Sciences, University of the Witwatersrand, 2050 Johannesburg, Gauteng South Africa
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84
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Abstract
Corneal dystrophies are a group of inherited disorders affecting the cornea, many of which lead to visual impairment. The International Committee for Classification of Corneal Dystrophies has established criteria to clarify the status of the various corneal dystrophies, which include the knowledge of the underlying genetics. In this review, we discuss the International Committee for Classification of Corneal Dystrophies category 1 (second edition) corneal dystrophies, for which a clear genetic link has been established. We highlight the various mechanisms underlying corneal dystrophy pathology, including structural disorganization, instability or maladhesion, aberrant protein stability and deposition, abnormal cellular proliferation or apoptosis, and dysfunction of normal enzymatic processes. Understanding these genetic mechanisms is essential for designing targets for therapeutic intervention, especially in the age of gene therapy and gene editing.
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Affiliation(s)
- Verity Frances Oliver
- From the *Department of Ophthalmology, New Zealand National Eye Centre, Faculty of Medical and Health Sciences, The University of Auckland, Auckland, New Zealand; and †Eye Department, Greenlane Clinical Centre, Auckland District Health Board, Auckland, New Zealand
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85
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Abstract
Bietti crystalline dystrophy (BCD) is an inherited retinal degenerative disease characterized by crystalline deposits in the retina, followed by progressive atrophy of the retinal pigment epithelium (RPE), choriocapillaris, and photoreceptors. CYP4V2 has been identified as the causative gene for BCD. The CYP4V2 gene belongs to the cytochrome P450 superfamily and encodes for fatty acid ω-hydroxylase of both saturated and unsaturated fatty acids. The CYP4V2 protein is localized most abundantly within the endoplasmic reticulum in the RPE and is postulated to play a role in the physiological lipid recycling system between the RPE and photoreceptors to maintain visual function. Electroretinographic assessments have revealed progressive dysfunction of rod and cone photoreceptors in patients with BCD. Several genotypes have been associated with more severe phenotypes based on clinical and electrophysiological findings. With the advent of multimodal imaging with spectral domain optical coherence tomography, fundus autofluorescence, and adaptive optics scanning laser ophthalmoscopy, more precise delineation of BCD severity and progression is now possible, allowing for the potential future development of targets for gene therapy.
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Affiliation(s)
- Danny S C Ng
- From the *Department of Ophthalmology and Visual Sciences, The Chinese University of Hong Kong; and †2010 Retina and Macula Centre, Kowloon, Hong Kong
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86
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Abstract
Despite ever-increasing understanding of the genetic underpinnings of many corneal dystrophies, gene therapy designed to ameliorate disease has not yet been reported in any human patient. In this review, we explore the likely reasons for this apparent failure of translation. We identify the requirements for success: the genetic defect involved must have been identified and mapped, vision in the affected patient must be significantly impaired or likely to be impaired, no better or equivalently effective treatment must be available, the treatment must be capable of modulating corneal pathology, and delivery of the construct to the appropriate cell must be practicable. We consider which of the corneal dystrophies might be amenable to treatment by genetic manipulations, summarize existing therapeutic options for treatment, and explore gene editing using clustered regularly interspaced short palindromic repeat/Cas and other similar transformative technologies as the way of the future. We then summarize recent laboratory-based advances in gene delivery and the development of in vitro and in vivo models of the corneal dystrophies. Finally, we review recent experimental work that has increased our knowledge of the pathobiology of these conditions.
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Affiliation(s)
- Keryn A Williams
- From the Department of Ophthalmology, Flinders University, Adelaide, Australia
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87
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Le DJ, Chung DWD, Frausto RF, Kim MJ, Aldave AJ. Identification of Potentially Pathogenic Variants in the Posterior Polymorphous Corneal Dystrophy 1 Locus. PLoS One 2016; 11:e0158467. [PMID: 27355326 PMCID: PMC4927100 DOI: 10.1371/journal.pone.0158467] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/31/2015] [Accepted: 06/16/2016] [Indexed: 12/13/2022] Open
Abstract
Posterior polymorphous corneal dystrophy 1 (PPCD1) is a genetic disorder that affects corneal endothelial cell function and leads to loss of visual acuity. PPCD1 has been linked to a locus on chromosome 20 in multiple families; however, Sanger sequencing of protein-coding genes in the consensus region failed to identify any causative missense mutations. In this study, custom capture probes were utilized for targeted next-generation sequencing of the linked region in a previously reported family with PPCD1. Variants were detected through two bioinformatics pipelines and filtered according to multiple criteria. Additionally, a high-resolution microarray was used to detect copy number variations. No non-synonymous variants in the protein-coding region of annotated genes were identified. However, 12 single nucleotide variants in 10 genes, and 9 indels in 7 genes met the filtering criteria and were considered candidate variants for PPCD1. Eleven single nucleotide variants were confirmed by Sanger sequencing, including 2 synonymous variants and 9 non-coding variants, in 9 genes. One microdeletion was detected in an intron of OVOL2 by microarray but was subsequently not identified by PCR. Using a comprehensive next-generation sequencing approach, a total of 16 genes containing single nucleotide variants or indels that segregated with the affected phenotype in an affected family previously mapped to the PPCD1 locus were identified. Screening of these candidate genes in other families previously mapped to the PPCD1 locus will likely result in the identification of the genetic basis of PPCD1.
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Affiliation(s)
- Derek J. Le
- Stein Eye Institute, David Geffen School of Medicine at UCLA, Los Angeles, California, United States of America
| | - Duk-Won D. Chung
- Stein Eye Institute, David Geffen School of Medicine at UCLA, Los Angeles, California, United States of America
| | - Ricardo F. Frausto
- Stein Eye Institute, David Geffen School of Medicine at UCLA, Los Angeles, California, United States of America
| | - Michelle J. Kim
- Stein Eye Institute, David Geffen School of Medicine at UCLA, Los Angeles, California, United States of America
| | - Anthony J. Aldave
- Stein Eye Institute, David Geffen School of Medicine at UCLA, Los Angeles, California, United States of America
- * E-mail:
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88
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Lin BR, Le DJ, Chen Y, Wang Q, Chung DD, Frausto RF, Croasdale C, Yee RW, Hejtmancik FJ, Aldave AJ. Whole Exome Sequencing and Segregation Analysis Confirms That a Mutation in COL17A1 Is the Cause of Epithelial Recurrent Erosion Dystrophy in a Large Dominant Pedigree Previously Mapped to Chromosome 10q23-q24. PLoS One 2016; 11:e0157418. [PMID: 27309958 PMCID: PMC4911149 DOI: 10.1371/journal.pone.0157418] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/28/2015] [Accepted: 05/31/2016] [Indexed: 12/04/2022] Open
Abstract
PURPOSE To report identification of a COL17A1 mutation in a family with a corneal dystrophy previously mapped to chromosome 10q23-q24. METHODS Whole-exome sequencing was performed on DNA samples from five affected family members and two unrelated, unaffected individuals. Identified variants were filtered for those that were: located in the linked interval on chromosome 10q23-q24; novel or rare (minor allele frequency ≤0.01); heterozygous; present in all affected individuals and not in controls; and present in genes that encode proteins expressed in human corneal epithelial cells (reads per kilobase per million ≥1). Sanger sequencing of identified variants (SNVs) was performed in additional family members. In silico analysis was used to predict the functional impact of non-synonymous variants. RESULTS Three SNVs located in two genes were identified that met the filtering criteria: one rare synonymous c.3156C>T variant in the collagen, type XVII, alpha I (COL17A1) gene; and two rare variants, one synonymous and one missense, in the dynamin binding protein (DNMBP) gene. Sanger sequencing of additional family members determined that only the COL17A1 variant segregates with the affected phenotype. In silico analysis predicts that the missense variant in DNMBP would be tolerated. CONCLUSIONS The corneal dystrophy mapped to chromosome 10q23-q24 is associated with the c.3156C>T variant in COL17A1. As this variant has recently been identified in five other families with early onset recurrent corneal erosions, and has been shown in vitro to introduce a cryptic splice donor site, this dystrophy is likely caused by aberrant splicing of COL17A1 and should be classified as epithelial recurrent erosion dystrophy.
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MESH Headings
- Aged
- Alleles
- Alternative Splicing
- Autoantigens/genetics
- Autoantigens/metabolism
- Case-Control Studies
- Chromosome Mapping
- Chromosomes, Human, Pair 10/chemistry
- Corneal Dystrophies, Hereditary/diagnosis
- Corneal Dystrophies, Hereditary/genetics
- Corneal Dystrophies, Hereditary/metabolism
- Corneal Dystrophies, Hereditary/pathology
- Cytoskeletal Proteins/genetics
- Epithelial Cells/metabolism
- Epithelial Cells/pathology
- Epithelium, Corneal/metabolism
- Epithelium, Corneal/pathology
- Exome
- Female
- Gene Expression
- Gene Frequency
- Genes, Dominant
- Genome-Wide Association Study
- Heterozygote
- Humans
- Male
- Mutation
- Non-Fibrillar Collagens/genetics
- Non-Fibrillar Collagens/metabolism
- Pedigree
- Phenotype
- Polymorphism, Single Nucleotide
- Sequence Analysis, DNA
- Collagen Type XVII
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Affiliation(s)
- Benjamin R. Lin
- Stein Eye Institute, David Geffen School of Medicine at UCLA, Los Angeles, California, United States of America
| | - Derek J. Le
- Stein Eye Institute, David Geffen School of Medicine at UCLA, Los Angeles, California, United States of America
| | - Yabin Chen
- Ophthalmic Genetics and Visual Function Branch, National Eye Institute, National Institutes of Health, Bethesda, Maryland, United States of America
| | - Qiwei Wang
- Ophthalmic Genetics and Visual Function Branch, National Eye Institute, National Institutes of Health, Bethesda, Maryland, United States of America
| | - D. Doug Chung
- Stein Eye Institute, David Geffen School of Medicine at UCLA, Los Angeles, California, United States of America
| | - Ricardo F. Frausto
- Stein Eye Institute, David Geffen School of Medicine at UCLA, Los Angeles, California, United States of America
| | | | - Richard W. Yee
- Cross Ophthalmology Associates, Houston, Texas, United States of America
| | - Fielding J. Hejtmancik
- Ophthalmic Genetics and Visual Function Branch, National Eye Institute, National Institutes of Health, Bethesda, Maryland, United States of America
| | - Anthony J. Aldave
- Stein Eye Institute, David Geffen School of Medicine at UCLA, Los Angeles, California, United States of America
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89
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Shen AL, Moran SA, Glover EA, Drinkwater NR, Swearingen RE, Teixeira LB, Bradfield CA. Association of a Chromosomal Rearrangement Event with Mouse Posterior Polymorphous Corneal Dystrophy and Alterations in Csrp2bp, Dzank1, and Ovol2 Gene Expression. PLoS One 2016; 11:e0157577. [PMID: 27310661 PMCID: PMC4910986 DOI: 10.1371/journal.pone.0157577] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/23/2015] [Accepted: 06/01/2016] [Indexed: 12/26/2022] Open
Abstract
We have previously described a mouse model of human posterior polymorphous corneal dystrophy (PPCD) and localized the causative mutation to a 6.2 Mbp region of chromosome 2, termed Ppcd1. We now show that the gene rearrangement linked to mouse Ppcd1 is a 3.9 Mbp chromosomal inversion flanked by 81 Kbp and 542 bp deletions. This recombination event leads to deletion of Csrp2bp Exons 8 through 11, Dzank1 Exons 20 and 21, and the pseudogene Znf133. In addition, we identified translocation of novel downstream sequences to positions adjacent to Csrp2bp Exon 7 and Dzank1 Exon 20. Twelve novel fusion transcripts involving Csrp2bp or Dzank1 linked to downstream sequences have been identified. Eight are expressed at detectable levels in PPCD1 but not wildtype eyes. Upregulation of two Csrp2bp fusion transcripts, as well as upregulation of the adjacent gene, Ovol2, was observed. Absence of the PPCD1 phenotype in animals haploinsufficient for Csrp2bp or both Csrp2bp and Dzank1 rules out haploinsufficiency of these genes as a cause of mouse PPCD1. Complementation experiments confirm that PPCD1 embryonic lethality is due to disruption of Csrp2bp expression. The ocular expression pattern of Csrp2bp is consistent with a role for this protein in corneal development and pathogenesis of PPCD1.
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Affiliation(s)
- Anna L. Shen
- The McArdle Laboratory for Cancer Research, Department of Oncology, School of Medicine and Public Health, University of Wisconsin-Madison, Madison, WI, United States of America
- McPherson Eye Research Institute, University of Wisconsin, Madison, Wisconsin, United States of America
- * E-mail: (CAB); (ALS)
| | - Susan A. Moran
- The McArdle Laboratory for Cancer Research, Department of Oncology, School of Medicine and Public Health, University of Wisconsin-Madison, Madison, WI, United States of America
| | - Edward A. Glover
- The McArdle Laboratory for Cancer Research, Department of Oncology, School of Medicine and Public Health, University of Wisconsin-Madison, Madison, WI, United States of America
| | - Norman R. Drinkwater
- The McArdle Laboratory for Cancer Research, Department of Oncology, School of Medicine and Public Health, University of Wisconsin-Madison, Madison, WI, United States of America
| | - Rebecca E. Swearingen
- The McArdle Laboratory for Cancer Research, Department of Oncology, School of Medicine and Public Health, University of Wisconsin-Madison, Madison, WI, United States of America
| | - Leandro B. Teixeira
- Department of Pathobiological Sciences, School of Veterinary Medicine, University of Wisconsin-Madison, Madison, WI, United States of America
- McPherson Eye Research Institute, University of Wisconsin, Madison, Wisconsin, United States of America
| | - Christopher A. Bradfield
- The McArdle Laboratory for Cancer Research, Department of Oncology, School of Medicine and Public Health, University of Wisconsin-Madison, Madison, WI, United States of America
- Wisconsin Institute for Discovery, University of Wisconsin-Madison, Madison, WI, United States of America
- McPherson Eye Research Institute, University of Wisconsin, Madison, Wisconsin, United States of America
- * E-mail: (CAB); (ALS)
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90
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Chae H, Kim M, Kim Y, Kim J, Kwon A, Choi H, Park J, Jang W, Lee YS, Park SH, Kim MS. Mutational spectrum of Korean patients with corneal dystrophy. Clin Genet 2016; 89:678-89. [PMID: 26748743 DOI: 10.1111/cge.12726] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/12/2015] [Revised: 12/29/2015] [Accepted: 01/04/2016] [Indexed: 11/29/2022]
Abstract
Corneal dystrophy typically refers to a group of rare hereditary disorders with a heterogeneous genetic background. A comprehensive molecular genetic analysis was performed to characterize the genetic spectrum of corneal dystrophies in Korean patients. Patients with various corneal dystrophies underwent thorough ophthalmic examination, histopathologic examination, and Sanger sequencing. A total of 120 probands were included, with a mean age of 50 years (SD = 18 years) and 70% were female. A total of 26 mutations in five genes (14 clearly pathogenic and 12 likely pathogenic) were identified in 49 probands (41%). Epithelial-stromal TGFBI dystrophies, macular corneal dystrophy and Schnyder corneal dystrophy (SCD) showed 100% mutation detection rates, while endothelial corneal dystrophies showed lower detection rates of 3%. Twenty six non-duplicate mutations including eight novel mutations were identified and mutations associated with SCD were identified genetically for the first time in this population. This study provides a comprehensive characterization of the genetic aberrations in Korean patients and also highlights the diagnostic value of molecular genetic analysis in corneal dystrophies.
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Affiliation(s)
- H Chae
- Department of Laboratory Medicine, College of Medicine, The Catholic University of Korea, Seoul, Republic of Korea
- Catholic Genetic Laboratory Center, Seoul St. Mary's Hospital, College of Medicine, The Catholic University of Korea, Seoul, Republic of Korea
| | - M Kim
- Department of Laboratory Medicine, College of Medicine, The Catholic University of Korea, Seoul, Republic of Korea
- Catholic Genetic Laboratory Center, Seoul St. Mary's Hospital, College of Medicine, The Catholic University of Korea, Seoul, Republic of Korea
| | - Y Kim
- Department of Laboratory Medicine, College of Medicine, The Catholic University of Korea, Seoul, Republic of Korea
- Catholic Genetic Laboratory Center, Seoul St. Mary's Hospital, College of Medicine, The Catholic University of Korea, Seoul, Republic of Korea
| | - J Kim
- Catholic Genetic Laboratory Center, Seoul St. Mary's Hospital, College of Medicine, The Catholic University of Korea, Seoul, Republic of Korea
| | - A Kwon
- Catholic Genetic Laboratory Center, Seoul St. Mary's Hospital, College of Medicine, The Catholic University of Korea, Seoul, Republic of Korea
| | - H Choi
- Catholic Genetic Laboratory Center, Seoul St. Mary's Hospital, College of Medicine, The Catholic University of Korea, Seoul, Republic of Korea
| | - J Park
- Department of Laboratory Medicine, College of Medicine, The Catholic University of Korea, Seoul, Republic of Korea
- Catholic Genetic Laboratory Center, Seoul St. Mary's Hospital, College of Medicine, The Catholic University of Korea, Seoul, Republic of Korea
| | - W Jang
- Catholic Genetic Laboratory Center, Seoul St. Mary's Hospital, College of Medicine, The Catholic University of Korea, Seoul, Republic of Korea
| | - Y S Lee
- Department of Hospital Pathology, College of Medicine, The Catholic University of Korea, Seoul, Republic of Korea
| | - S H Park
- Department of Ophthalmology, College of Medicine, The Catholic University of Korea, Seoul, Republic of Korea
| | - M S Kim
- Department of Ophthalmology, College of Medicine, The Catholic University of Korea, Seoul, Republic of Korea
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91
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Oliver VF, van Bysterveldt KA, Cadzow M, Steger B, Romano V, Markie D, Hewitt AW, Mackey DA, Willoughby CE, Sherwin T, Crosier PS, McGhee CN, Vincent AL. A COL17A1 Splice-Altering Mutation Is Prevalent in Inherited Recurrent Corneal Erosions. Ophthalmology 2016; 123:709-22. [PMID: 26786512 DOI: 10.1016/j.ophtha.2015.12.008] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/20/2015] [Revised: 11/06/2015] [Accepted: 12/05/2015] [Indexed: 12/28/2022] Open
Abstract
PURPOSE Corneal dystrophies are a genetically heterogeneous group of disorders. We previously described a family with an autosomal dominant epithelial recurrent erosion dystrophy (ERED). We aimed to identify the underlying genetic cause of ERED in this family and 3 additional ERED families. We sought to characterize the potential function of the candidate genes using the human and zebrafish cornea. DESIGN Case series study of 4 white families with a similar ERED. An experimental study was performed on human and zebrafish tissue to examine the putative biological function of candidate genes. PARTICIPANTS Four ERED families, including 28 affected and 17 unaffected individuals. METHODS HumanLinkage-12 arrays (Illumina, San Diego, CA) were used to genotype 17 family members. Next-generation exome sequencing was performed on an uncle-niece pair. Segregation of potential causative mutations was confirmed using Sanger sequencing. Protein expression was determined using immunohistochemistry in human and zebrafish cornea. Gene expression in zebrafish was assessed using whole-mount in situ hybridization. Morpholino-induced transient gene knockdown was performed in zebrafish embryos. MAIN OUTCOME MEASURES Linkage microarray, exome analysis, DNA sequence analysis, immunohistochemistry, in situ hybridization, and morpholino-induced genetic knockdown results. RESULTS Linkage microarray analysis identified a candidate region on chromosome chr10:12,576,562-112,763,135, and exploration of exome sequencing data identified 8 putative pathogenic variants in this linkage region. Two variants segregated in 06NZ-TRB1 with ERED: COL17A1 c.3156C→T and DNAJC9 c.334G→A. The COL17A1 c.3156C→T variant segregated in all 4 ERED families. We showed biologically relevant expression of these proteins in human cornea. Both proteins are expressed in the cornea of zebrafish embryos and adults. Zebrafish lacking Col17a1a and Dnajc9 during development show no gross corneal phenotype. CONCLUSIONS The COL17A1 c.3156C→T variant is the likely causative mutation in our recurrent corneal erosion families, and its presence in 4 independent families suggests that it is prevalent in ERED. This same COL17A1 c.3156C→T variant recently was identified in a separate pedigree with ERED. Our study expands the phenotypic spectrum of COL17A1 disease from autosomal recessive epidermolysis bullosa to autosomal dominant ERED and identifies COL17A1 as a key protein in maintaining integrity of the corneal epithelium.
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Affiliation(s)
- Verity F Oliver
- Department of Ophthalmology, New Zealand National Eye Centre, Faculty of Medical and Health Sciences, The University of Auckland, Auckland, New Zealand
| | - Katherine A van Bysterveldt
- Department of Ophthalmology, New Zealand National Eye Centre, Faculty of Medical and Health Sciences, The University of Auckland, Auckland, New Zealand
| | - Murray Cadzow
- Department of Biochemistry, Dunedin School of Medicine, Otago University, Dunedin, New Zealand
| | - Bernhard Steger
- Department of Corneal and External Eye Diseases, St. Paul's Eye Unit, Royal Liverpool University Hospital, Liverpool, United Kingdom
| | - Vito Romano
- Department of Corneal and External Eye Diseases, St. Paul's Eye Unit, Royal Liverpool University Hospital, Liverpool, United Kingdom
| | - David Markie
- Pathology Department, Dunedin School of Medicine, Otago University, Dunedin, New Zealand
| | - Alex W Hewitt
- Menzies Institute for Medical Research, University of Tasmania, Hobart, Australia; Lions Eye Institute, University of Western Australia, Perth, Australia
| | - David A Mackey
- Menzies Institute for Medical Research, University of Tasmania, Hobart, Australia; Lions Eye Institute, University of Western Australia, Perth, Australia
| | - Colin E Willoughby
- Department of Corneal and External Eye Diseases, St. Paul's Eye Unit, Royal Liverpool University Hospital, Liverpool, United Kingdom; Department of Eye and Vision Science, Institute of Ageing and Chronic Disease, University of Liverpool, Liverpool, United Kingdom
| | - Trevor Sherwin
- Department of Ophthalmology, New Zealand National Eye Centre, Faculty of Medical and Health Sciences, The University of Auckland, Auckland, New Zealand
| | - Philip S Crosier
- Department of Molecular Medicine and Pathology, Faculty of Medical and Health Sciences, The University of Auckland, Auckland, New Zealand
| | - Charles N McGhee
- Department of Ophthalmology, New Zealand National Eye Centre, Faculty of Medical and Health Sciences, The University of Auckland, Auckland, New Zealand; Eye Department, Greenlane Clinical Centre, Auckland District Health Board, Auckland, New Zealand
| | - Andrea L Vincent
- Department of Ophthalmology, New Zealand National Eye Centre, Faculty of Medical and Health Sciences, The University of Auckland, Auckland, New Zealand; Eye Department, Greenlane Clinical Centre, Auckland District Health Board, Auckland, New Zealand.
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92
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Park SH, Ahn YJ, Chae H, Kim Y, Kim MS, Kim M. Molecular analysis of the CHST6 gene in Korean patients with macular corneal dystrophy: Identification of three novel mutations. Mol Vis 2015; 21:1201-9. [PMID: 26604660 PMCID: PMC4626780] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/03/2015] [Accepted: 10/22/2015] [Indexed: 11/02/2022] Open
Abstract
PURPOSE To identify the underlying genetic defect in Korean patients with macular corneal dystrophy (MCD). METHODS Genomic DNA was isolated from peripheral blood leukocytes of seven patients from six unrelated families with MCD (three men and four women). Polymerase chain reaction was performed for coding regions of the carbohydrate sulfotransferase (CHST6), gene followed by bidirectional sequencing. Targeted mutational analysis (exons 4, 11-12, 14) of the transforming growth factor, beta-induced (TGFBI) gene was performed for all patients. RESULTS All seven patients were found to have compound heterozygous mutations in the CHST6 gene. In addition to six previously reported mutations, c.95C>A (p.Ser32*), c.521A>G (p.Lys174Arg), c.557C>G (p.Pro186Arg), c.613C>T (p.Arg205Trp), c.820G>A (p.Glu274Lys), and c.1072T>C (p.Tyr358His), three novel mutations were identified in this study, including two missense mutations, c.353C>T (p.Ser118Phe) and c.922C>T (p.His308Tyr), and one frameshift mutation, c.786delC (p.L264Cfs*117). Among the three novel mutations, only the c.353C>T mutation had been reported in the Exon Aggregation Consortium database at an extremely low frequency of 0.00005072. In addition, these three novel mutations were absent from controls in 1,000 genomes, dbSNP, and the TIARA genome database, which is a Korean personal genome database. The most frequent mutation was c.613C>T (p.Arg205Trp), revealed in four unrelated Korean families, which has not previously been reported in other populations. No mutations were detected in the TGFBI gene. DISCUSSION This is the first report on genetic analysis of Korean MCD patients. Three novel and six previously reported disease-causing CHST6 mutations were identified, which expands the mutational spectrum of MCD.
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Affiliation(s)
- Shin Hae Park
- Department of Ophthalmology and Visual Science, College of Medicine, Seoul St. Mary’s Hospital, The Catholic University of Korea, Seoul, Republic of Korea
| | - Ye Jin Ahn
- Department of Ophthalmology and Visual Science, College of Medicine, Seoul St. Mary’s Hospital, The Catholic University of Korea, Seoul, Republic of Korea
| | - Hyojin Chae
- Department of Laboratory Medicine, College of Medicine, Seoul St, Mary’s Hospital, The Catholic University of Korea, Seoul, Republic of Korea
| | - Yonggoo Kim
- Department of Laboratory Medicine, College of Medicine, Seoul St, Mary’s Hospital, The Catholic University of Korea, Seoul, Republic of Korea
| | - Man Soo Kim
- Department of Ophthalmology and Visual Science, College of Medicine, Seoul St. Mary’s Hospital, The Catholic University of Korea, Seoul, Republic of Korea
| | - Myungshin Kim
- Department of Laboratory Medicine, College of Medicine, Seoul St, Mary’s Hospital, The Catholic University of Korea, Seoul, Republic of Korea
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93
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Jonsson F, Byström B, Davidson AE, Backman LJ, Kellgren TG, Tuft SJ, Koskela T, Rydén P, Sandgren O, Danielson P, Hardcastle AJ, Golovleva I. Mutations in collagen, type XVII, alpha 1 (COL17A1) cause epithelial recurrent erosion dystrophy (ERED). Hum Mutat 2015; 36:463-73. [PMID: 25676728 DOI: 10.1002/humu.22764] [Citation(s) in RCA: 29] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/07/2014] [Accepted: 02/02/2015] [Indexed: 01/04/2023]
Abstract
Corneal dystrophies are a clinically and genetically heterogeneous group of inherited disorders that bilaterally affect corneal transparency. They are defined according to the corneal layer affected and by their genetic cause. In this study, we identified a dominantly inherited epithelial recurrent erosion dystrophy (ERED)-like disease that is common in northern Sweden. Whole-exome sequencing resulted in the identification of a novel mutation, c.2816C>T, p.T939I, in the COL17A1 gene, which encodes collagen type XVII alpha 1. The variant segregated with disease in a genealogically expanded pedigree dating back 200 years. We also investigated a unique COL17A1 synonymous variant, c.3156C>T, identified in a previously reported unrelated dominant ERED-like family linked to a locus on chromosome 10q23-q24 encompassing COL17A1. We show that this variant introduces a cryptic donor site resulting in aberrant pre-mRNA splicing and is highly likely to be pathogenic. Bi-allelic COL17A1 mutations have previously been associated with a recessive skin disorder, junctional epidermolysis bullosa, with recurrent corneal erosions being reported in some cases. Our findings implicate presumed gain-of-function COL17A1 mutations causing dominantly inherited ERED and improve understanding of the underlying pathology.
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Affiliation(s)
- Frida Jonsson
- Department of Medical Biosciences/Medical and Clinical Genetics, Umeå University, Umeå, Sweden
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Halford S, Liew G, Mackay DS, Sergouniotis PI, Holt R, Broadgate S, Volpi EV, Ocaka L, Robson AG, Holder GE, Moore AT, Michaelides M, Webster AR. Author reply: To PMID 24480711. Ophthalmology 2015; 122:e22. [PMID: 25797088 DOI: 10.1016/j.ophtha.2014.08.041] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/26/2014] [Accepted: 08/27/2014] [Indexed: 11/16/2022] Open
Affiliation(s)
- Stephanie Halford
- Nuffield Laboratory of Ophthalmology, Nuffield Department of Clinical Neuroscience, University of Oxford, Oxford, UK.
| | - Gerald Liew
- Centre for Vision Research, Westmead Millennium Institute, University of Sydney, Sydney, Australia; Moorfields Eye Hospital, London, UK
| | | | - Panagiotis I Sergouniotis
- Moorfields Eye Hospital, London, UK; University College London, Institute of Ophthalmology, Bath Street, London, UK
| | - Richard Holt
- Nuffield Laboratory of Ophthalmology, Nuffield Department of Clinical Neuroscience, University of Oxford, Oxford, UK
| | - Suzanne Broadgate
- Nuffield Laboratory of Ophthalmology, Nuffield Department of Clinical Neuroscience, University of Oxford, Oxford, UK
| | - Emanuela V Volpi
- Molecular Cytogenetics and Microscopy Core, Wellcome Trust Centre for Human Genetics, University of Oxford, Oxford, UK
| | | | - Anthony G Robson
- Moorfields Eye Hospital, London, UK; University College London, Institute of Ophthalmology, Bath Street, London, UK
| | - Graham E Holder
- Moorfields Eye Hospital, London, UK; University College London, Institute of Ophthalmology, Bath Street, London, UK
| | - Anthony T Moore
- Moorfields Eye Hospital, London, UK; University College London, Institute of Ophthalmology, Bath Street, London, UK
| | - Michel Michaelides
- Moorfields Eye Hospital, London, UK; University College London, Institute of Ophthalmology, Bath Street, London, UK
| | - Andrew R Webster
- Moorfields Eye Hospital, London, UK; University College London, Institute of Ophthalmology, Bath Street, London, UK
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95
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McDougall ARA, Tolcos M, Hooper SB, Cole TJ, Wallace MJ. Trop2: from development to disease. Dev Dyn 2015; 244:99-109. [PMID: 25523132 DOI: 10.1002/dvdy.24242] [Citation(s) in RCA: 72] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/07/2014] [Revised: 12/08/2014] [Accepted: 12/11/2014] [Indexed: 11/08/2022] Open
Abstract
BACKGROUND Trop2 was first discovered as a biomarker of invasive trophoblast cells. Since then most research has focused on its role in tumourigenesis because it is highly expressed in the vast majority of human tumours and animal models of cancer. It is also highly expressed in stem cells and in many organs during development. RESULTS We review the multifaceted role of Trop2 during development and tumourigenesis, including its role in regulating cell proliferation and migration, self-renewal, and maintenance of basement membrane integrity. We discuss the evolution of Trop2 and its related protein Epcam (Trop1), including their distinct roles. Mutation of Trop2 leads to gelatinous drop-like corneal dystrophy, whereas over-expression of Trop2 in human tumours promotes tumour aggressiveness and increases mortality. Although Trop2 expression is sufficient to promote tumour growth, the surprising discovery that Trop2-null mice have an increased risk of tumour development has highlighted the complexity of Trop2 signaling. Recently, studies have begun to identify the mechanisms underlying TROP2’s functions, including regulated intramembrane proteolysis or specific interactions with integrin b1 and claudin proteins. CONCLUSIONS Understanding the mechanisms underlying TROP2 signaling will clarify its role during development, aid in the development of better cancer treatments and unlock a promising new direction in regenerative medicine.
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96
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Sohn EH, Wang K, Thompson S, Riker MJ, Hoffmann JM, Stone EM, Mullins RF. Comparison of drusen and modifying genes in autosomal dominant radial drusen and age-related macular degeneration. Retina 2015; 35:48-57. [PMID: 25077532 PMCID: PMC5513174 DOI: 10.1097/iae.0000000000000263] [Citation(s) in RCA: 28] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Abstract
BACKGROUND Autosomal dominant radial drusen (ADRD), also termed Malattia Leventinese and Doyne honeycomb retinal dystrophy, causes early-onset vision loss because of mutation in EFEMP1. Drusen in an exceedingly rare ADRD human donor eye was compared with eyes affected with age-related macular degeneration (AMD). This study also elucidated whether variations in high-risk AMD genotypes modify phenotypic severity of ADRD. METHODS Morphologic and histochemical analyses of drusen in one ADRD donor and seven AMD donors. Evaluation of complement factor H (CFH) and ARMS2/HTRA1 alleles in a cohort of 25 subjects with ADRD. RESULTS Autosomal dominant radial drusen had unique onion skin-like lamination but otherwise shared many compositional features with hard, nodular drusen and/or diffuse soft drusen with basal deposits. Autosomal dominant radial drusen also possessed collagen type IV, an extracellular matrix protein that is absent in age-related drusen. Antibodies directed against the membrane attack complex showed robust labeling of ADRD. Vitronectin and amyloid P were present in drusen of both types. High-risk alleles in the CFH and ARMS2/HTRA1 genes were not associated with increasing ADRD severity. CONCLUSION Drusen from ADRD and AMD exhibit overlap of some major constituents, but ADRD exhibit distinct alterations in the extracellular matrix that are absent in AMD.
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Affiliation(s)
- Elliott H Sohn
- *Stephen A. Wynn Institute for Vision Research, University of Iowa, Iowa City, Iowa; Departments of †Ophthalmology and Visual Sciences, and ‡Biostatistics, University of Iowa, Iowa City, Iowa; and §The Howard Hughes Medical Institute, University of Iowa, Iowa City, Iowa
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Nowinska AK, Wylegala E, Teper S, Wróblewska-Czajka E, Aragona P, Roszkowska AM, Micali A, Pisani A, Puzzolo D. Phenotype and genotype analysis in patients with macular corneal dystrophy. Br J Ophthalmol 2014; 98:1514-21. [PMID: 24926691 DOI: 10.1136/bjophthalmol-2014-305098] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/04/2022]
Abstract
AIM The aim of this study was to analyse corneal morphological organisation and identify mutations in the carbohydrate sulfotransferase 6 gene (CHST6) in patients with macular corneal dystrophy originating in a Polish population. METHODS Macular corneal dystrophy was diagnosed in 24 patients based on the slit-lamp exam, confocal microscopy, 1310 nm time domain and 840 nm spectral domain optical coherence tomography. 10 corneal buttons obtained from penetrating keratoplasty were processed for light microscopy. Genetic analysis of the CHST6 gene was performed, followed by a study of the sequencing results. RESULTS Highly reflective, diffuse corneal deposits and a general increase in reflectivity were revealed with optical coherence tomography and confocal microscopy. The deposits extended from the Bowman layer to the Descemet membrane and correlated with the Alcian blue-positive granular-filamentous material into and around the stromal keratocytes confirmed by structural analysis of the corneal buttons. The genetic analysis of the blood samples identified the following mutations and single nucleotide polymorphisms: novel P64L (heterozygous), Y110C (homozygous), R162G and L200R, and M1L (heterozygous and homozygous). CONCLUSIONS Genetic mutation heterogeneity was revealed. No phenotype heterogeneity was revealed among patients with in vivo corneal morphology assessment or histological analysis.
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Affiliation(s)
- Anna K Nowinska
- II Ophthalmology Clinic, Silesian Medical University, Katowice, Poland
| | - Edward Wylegala
- II Ophthalmology Clinic, Silesian Medical University, Katowice, Poland
| | - Sławomir Teper
- II Ophthalmology Clinic, Silesian Medical University, Katowice, Poland
| | | | - Pasquale Aragona
- Department of Experimental Medical-Surgical Sciences, Ocular Surface Diseases Unit, University of Messina, Messina, Italy
| | - Anna M Roszkowska
- Department of Experimental Medical-Surgical Sciences, Ocular Surface Diseases Unit, University of Messina, Messina, Italy
| | - Antonio Micali
- Department of Biomedical Sciences and Morphofunctional Imaging, University of Messina, Messina, Italy
| | - Antonina Pisani
- Department of Biomedical Sciences and Morphofunctional Imaging, University of Messina, Messina, Italy
| | - Domenico Puzzolo
- Department of Biomedical Sciences and Morphofunctional Imaging, University of Messina, Messina, Italy
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Dudakova L, Palos M, Svobodova M, Bydzovsky J, Huna L, Jirsova K, Hardcastle AJ, Tuft SJ, Liskova P. Macular corneal dystrophy and associated corneal thinning. Eye (Lond) 2014; 28:1201-5. [PMID: 25081284 PMCID: PMC4194335 DOI: 10.1038/eye.2014.164] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/02/2013] [Accepted: 05/31/2014] [Indexed: 11/08/2022] Open
Abstract
PURPOSE To identify the molecular genetic cause of macular corneal dystrophy (MCD) in four probands, and characterize phenotypic similarities between MCD and keratoconus. METHODS We performed ophthalmological examination, Scheimpflug imaging (Pentacam, Oculus Inc.), histopathological examination of excised corneal buttons, and direct sequencing of the CHST6 coding region. RESULTS Pentacam measurements were taken in six eyes of three probands. All showed diffuse corneal thinning with paracentral steepening of the anterior corneal surface that was graded as keratoconus by the integrated software, but without associated ectasia of the posterior corneal surface or regional thinning. Homozygous or compound heterozygous CHST6 mutations were identified in all cases, including two novel mutations, c.13C>T; p.(Arg5Cys) and c.289C>T; p.(Arg97Cys). DISCUSSION Localized elevation of the anterior corneal curvature can occur in MCD in the absence of other features of keratoconus. The identification of a further two Czech probands with the compound allele c.[484C>G; 599T>G] supports the enrichment of this allele in the study population.
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Affiliation(s)
- L Dudakova
- Laboratory of the Biology and Pathology of the Eye, Institute of Inherited Metabolic Disorders, First Faculty of Medicine, Charles University in Prague and General University Hospital in Prague, Prague, Czech Republic
| | - M Palos
- Department of Ophthalmology, First Faculty of Medicine, Charles University in Prague and General University Hospital in Prague, Prague, Czech Republic
| | - M Svobodova
- Department of Ophthalmology, First Faculty of Medicine, Charles University in Prague and General University Hospital in Prague, Prague, Czech Republic
| | - J Bydzovsky
- Department of Ophthalmology, First Faculty of Medicine, Charles University in Prague and General University Hospital in Prague, Prague, Czech Republic
| | - L Huna
- Department of Ophthalmology, First Faculty of Medicine, Charles University in Prague and General University Hospital in Prague, Prague, Czech Republic
| | - K Jirsova
- Laboratory of the Biology and Pathology of the Eye, Institute of Inherited Metabolic Disorders, First Faculty of Medicine, Charles University in Prague and General University Hospital in Prague, Prague, Czech Republic
| | - A J Hardcastle
- Department of Ocular Biology and Therapeutics, UCL Institute of Ophthalmology, London, UK
| | - S J Tuft
- Department of Ocular Biology and Therapeutics, UCL Institute of Ophthalmology, London, UK
- Corneal Service, Moorfields Eye Hospital NHS Foundation Trust, London, UK
| | - P Liskova
- Laboratory of the Biology and Pathology of the Eye, Institute of Inherited Metabolic Disorders, First Faculty of Medicine, Charles University in Prague and General University Hospital in Prague, Prague, Czech Republic
- Department of Ophthalmology, First Faculty of Medicine, Charles University in Prague and General University Hospital in Prague, Prague, Czech Republic
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99
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Gonzalez-Rodriguez J, Ramirez-Miranda A, Hernandez-Da Mota SE, Zenteno JC. TGFBI, CHST6, and GSN gene analysis in Mexican patients with stromal corneal dystrophies. Graefes Arch Clin Exp Ophthalmol 2014; 252:1267-72. [PMID: 24801599 DOI: 10.1007/s00417-014-2648-9] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/22/2014] [Revised: 04/07/2014] [Accepted: 04/11/2014] [Indexed: 10/25/2022] Open
Abstract
OBJECTIVES The purpose of our study was to describe the results of molecular screening of TGFBI, CHST6, and GSN genes in a group of Mexican patients with different stromal corneal dystrophies (CD). MATERIAL AND METHODS A total of 16 CD Mexican patients pertaining to nine different pedigrees were subjected to a complete ophthalmological investigation. A clinical diagnosis of lattice CD was performed in 10 patients from five pedigrees. Three patients from two pedigrees were diagnosed with granular CD type 2, two patients with unrelated probands had Finnish-type corneal amyloidosis, and one patient had macular CD. Genetic analysis included DNA isolation from blood leukocytes and polymerase chain reaction (PCR) amplification and direct nucleotide sequencing of TGFBI, CHST6, and GSN genes. RESULTS Seven lattice CD patients from four unrelated families had an identical p.H626R mutation in TGFBI, three patients from a single lattice CD family carried a p.R124C substitution in TGFBI, and a granular type 2 CD pedigree was demonstrated to carry a heterozygous TGFBI p.M619K substitution. A patient having Finnish-type corneal amyloidosis had a p.D187N mutation in GSN. Finally, molecular analysis of CHST6 in a patient with macular CD disclosed the presence of a homozygous p.Y110C change. CONCLUSIONS This study improves the knowledge of the genetic features of Mexican patients with corneal stromal dystrophies by identifying mutations in the TGFBI, CHST6, and GSN genes. Genetic screening of larger samples of patients from distinct ethnic groups would be of great importance for a better understanding of the mutational spectrum of stromal CD.
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Affiliation(s)
- Johanna Gonzalez-Rodriguez
- Department of Genetics-Research Unit, Institute of Ophthalmology "Conde de Valenciana", Mexico City, Mexico
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Lakshminarayanan R, Chaurasia SS, Anandalakshmi V, Chai SM, Murugan E, Vithana EN, Beuerman RW, Mehta JS. Clinical and genetic aspects of the TGFBI-associated corneal dystrophies. Ocul Surf 2014; 12:234-51. [PMID: 25284770 DOI: 10.1016/j.jtos.2013.12.002] [Citation(s) in RCA: 54] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/02/2013] [Revised: 12/05/2013] [Accepted: 12/05/2013] [Indexed: 11/16/2022]
Abstract
Corneal dystrophies are a group of inherited disorders localized to various layers of the cornea that affect corneal transparency and visual acuity. The deposition of insoluble protein materials in the form of extracellular deposits or intracellular cysts is pathognomic. Mutations in TGFBI are responsible for superficial and stromal corneal dystrophies. The gene product, transforming growth factor β induced protein (TGFBIp) accumulates as insoluble deposits in various forms. The severity, clinicopathogenic variations, age of the onset, and location of the deposits depend on the type of amino acid alterations in the protein. Until 2006, 38 different pathogenic mutants were reported for the TGFBI-associated corneal dystrophies. This number has increased to 63 mutants, reported in more than 30 countries. There is no effective treatment to prevent, halt, or reverse the deposition of TGFBIp. This review presents a complete mutation update, classification of phenotypes, comprehensive reported incidents of various mutations, and current treatment options and their shortcomings. Future research directions and possible approaches to inhibiting disease progression are discussed.
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Affiliation(s)
- R Lakshminarayanan
- Singapore Eye Research Institute, Singapore; SRP Neuroscience and Behavioral Disorders, Duke-NUS Graduate Medical School, Singapore
| | - Shyam S Chaurasia
- Singapore Eye Research Institute, Singapore; SRP Neuroscience and Behavioral Disorders, Duke-NUS Graduate Medical School, Singapore; Department of Ophthalmology, Yong Loo Lin School of Medicine, National University of Singapore, Singapore
| | | | - Shu-Ming Chai
- Singapore Eye Research Institute, Singapore; Singapore National Eye Centre, Singapore
| | | | - Eranga N Vithana
- Singapore Eye Research Institute, Singapore; SRP Neuroscience and Behavioral Disorders, Duke-NUS Graduate Medical School, Singapore; Department of Ophthalmology, Yong Loo Lin School of Medicine, National University of Singapore, Singapore
| | - Roger W Beuerman
- Singapore Eye Research Institute, Singapore; SRP Neuroscience and Behavioral Disorders, Duke-NUS Graduate Medical School, Singapore; Department of Ophthalmology, Yong Loo Lin School of Medicine, National University of Singapore, Singapore
| | - Jodhbir S Mehta
- Singapore Eye Research Institute, Singapore; Department of Ophthalmology, Yong Loo Lin School of Medicine, National University of Singapore, Singapore; Singapore National Eye Centre, Singapore; Department of Clinical Sciences, Duke-NUS Graduate Medical School, Singapore.
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