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Yang M, Peng L, Lv L, Dai E, He Y, Zhao R, Li S. Characterization of a novel heterozygous frameshift variant in NDP gene that causes familial exudative vitreoretinopathy in female patients. Mol Genet Genomics 2024; 299:32. [PMID: 38472449 DOI: 10.1007/s00438-024-02128-3] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/14/2023] [Accepted: 10/28/2023] [Indexed: 03/14/2024]
Abstract
Familial exudative vitreoretinopathy (FEVR) is a severe inherited disease characterized by defective retinal vascular development. With genetic and clinical heterogeneity, FEVR can be inherited in different patterns and characterized by phenotypes ranging from moderate visual defects to complete vision loss. This study was conducted to unravel the genetic and functional etiology of a 4-month-old female FEVR patient. Targeted gene panel and Sanger sequencing were utilized for genetic evaluation. Luciferase assays, western blot, quantitive real-time PCR, and immunocytochemistry were performed to verify the functional defects in the identified candidate variant. Here, we report a 4-month-old girl with bilateral retinal folds and peripheral avascularization, and identified a novel frameshift heterozygous variant c.37dup (p.Leu13ProfsTer13) in NDP. In vitro experiments revealed that the Leu13ProfsTer13 variant led to a prominent decrease in protein levels instead of mRNA levels, resulting in compromised Norrin/β-catenin signaling activity. Human androgen receptor assay further revealed that a slight skewing of X chromosome inactivation could partially cause FEVR. Thus, the pathogenic mechanism by which heterozygous frameshift or nonsense variants in female carriers cause FEVR might largely result from a loss-of-function variant in one X chromosome allele and a slightly skewed X-inactivation. Further recruitment of more FEVR-affected females carrying NDP variants and genotype-phenotype correlation analysis can ultimately offer valuable information for the prognosis prediction of FEVR.
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Affiliation(s)
- Mu Yang
- Sichuan Provincial Key Laboratory for Human Disease Gene Study, Department of Laboratory Medicine, Center for Medical Genetics, Sichuan Provincial People's Hospital, University of Electronic Science and Technology of China, 32 The First Ring Road West 2, Chengdu, 610072, Sichuan, China
- Research Unit of Blindness Prevention, Chinese Academy of Medical Sciences (No. 2019RU026), Sichuan Academy of Medical Sciences and Sichuan Provincial People's Hospital, Chengdu, China
| | - Li Peng
- Sichuan Provincial Key Laboratory for Human Disease Gene Study, Department of Laboratory Medicine, Center for Medical Genetics, Sichuan Provincial People's Hospital, University of Electronic Science and Technology of China, 32 The First Ring Road West 2, Chengdu, 610072, Sichuan, China
- Research Unit of Blindness Prevention, Chinese Academy of Medical Sciences (No. 2019RU026), Sichuan Academy of Medical Sciences and Sichuan Provincial People's Hospital, Chengdu, China
| | - Liting Lv
- Sichuan Provincial Key Laboratory for Human Disease Gene Study, Department of Laboratory Medicine, Center for Medical Genetics, Sichuan Provincial People's Hospital, University of Electronic Science and Technology of China, 32 The First Ring Road West 2, Chengdu, 610072, Sichuan, China
- Research Unit of Blindness Prevention, Chinese Academy of Medical Sciences (No. 2019RU026), Sichuan Academy of Medical Sciences and Sichuan Provincial People's Hospital, Chengdu, China
| | - Erkuan Dai
- Department of Ophthalmology, Xin Hua Hospital Affiliated to Shanghai Jiao Tong University School of Medicine, Shanghai, China
| | - Yunqi He
- Sichuan Provincial Key Laboratory for Human Disease Gene Study, Department of Laboratory Medicine, Center for Medical Genetics, Sichuan Provincial People's Hospital, University of Electronic Science and Technology of China, 32 The First Ring Road West 2, Chengdu, 610072, Sichuan, China
- Research Unit of Blindness Prevention, Chinese Academy of Medical Sciences (No. 2019RU026), Sichuan Academy of Medical Sciences and Sichuan Provincial People's Hospital, Chengdu, China
| | - Rulian Zhao
- Sichuan Provincial Key Laboratory for Human Disease Gene Study, Department of Laboratory Medicine, Center for Medical Genetics, Sichuan Provincial People's Hospital, University of Electronic Science and Technology of China, 32 The First Ring Road West 2, Chengdu, 610072, Sichuan, China
- Research Unit of Blindness Prevention, Chinese Academy of Medical Sciences (No. 2019RU026), Sichuan Academy of Medical Sciences and Sichuan Provincial People's Hospital, Chengdu, China
| | - Shujin Li
- Sichuan Provincial Key Laboratory for Human Disease Gene Study, Department of Laboratory Medicine, Center for Medical Genetics, Sichuan Provincial People's Hospital, University of Electronic Science and Technology of China, 32 The First Ring Road West 2, Chengdu, 610072, Sichuan, China.
- Research Unit of Blindness Prevention, Chinese Academy of Medical Sciences (No. 2019RU026), Sichuan Academy of Medical Sciences and Sichuan Provincial People's Hospital, Chengdu, China.
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Sen P, Sreenivasan J. Commentary: Familial exudative vitreoretinopathy-The masquerade in pediatric retinal disorders. Indian J Ophthalmol 2022; 70:2496-2497. [PMID: 35791143 PMCID: PMC9426098 DOI: 10.4103/ijo.ijo_216_22] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022] Open
Affiliation(s)
- Parveen Sen
- Department of Vitreo-Retina, Shri Bhagwan Mahavir Vitreoretinal Services, Sankara Nethralaya, Chennai, Tamil Nadu, India
| | - Janani Sreenivasan
- Department of Vitreo-Retina, Shri Bhagwan Mahavir Vitreoretinal Services, Sankara Nethralaya, Chennai, Tamil Nadu, India
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Huang L, Zhang L, Li X, Lu J, Sun L, Chen L, Ding X, Li Z. Ocular manifestations of Chinese patients with copy number variants in the NDP gene. Mol Vis 2022; 28:29-38. [PMID: 35656167 PMCID: PMC9108013] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/28/2021] [Accepted: 03/23/2022] [Indexed: 12/04/2022] Open
Abstract
PURPOSE Familial exudative vitreoretinopathy (FEVR) and Norrie disease (ND) are genetic disorders that can be caused by mutations in the NDP gene and affect retinal vasculature growth and development. This study aimed to describe the copy number variations (CNVs) in the NDP gene in Chinese FEVR families and the associated phenotypes. METHODS This study recruited 651 FEVR families. SeqCNV was used to analyze the CNVs in the families without mutations in known FEVR-associated genes. Multiplex ligation-dependent probe amplification and semiquantitative multiplex PCR were performed to verify the NDP CNVs. The probands and family members underwent complete ocular examinations. RESULTS NDP CNVs were identified in four patients from three unrelated families, accounting for 15% of the patients with NDP mutations and 0.46% of the entire FEVR cohort. Exon 2 deletions were detected in two families, and whole gene deletion was identified in one family. The affected individuals were born blind with total retinal detachment. CONCLUSIONS The findings confirm that CNVs are a common NDP mutation type. The CNV-associated phenotype is congenital blindness with total retinal detachment. Antenatal genetic analyses and fetal ultrasound can facilitate early diagnosis and interventions in patients with NDP mutations.
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Affiliation(s)
- Li Huang
- State Key Laboratory of Ophthalmology, Zhongshan Ophthalmic Center, Sun Yat-sen University, Guangzhou, China
| | - Linyan Zhang
- State Key Laboratory of Ophthalmology, Zhongshan Ophthalmic Center, Sun Yat-sen University, Guangzhou, China
| | - Xiaoyu Li
- State Key Laboratory of Ophthalmology, Zhongshan Ophthalmic Center, Sun Yat-sen University, Guangzhou, China
| | - Jinglin Lu
- State Key Laboratory of Ophthalmology, Zhongshan Ophthalmic Center, Sun Yat-sen University, Guangzhou, China
| | - Limei Sun
- State Key Laboratory of Ophthalmology, Zhongshan Ophthalmic Center, Sun Yat-sen University, Guangzhou, China
| | - Limei Chen
- State Key Laboratory of Ophthalmology, Zhongshan Ophthalmic Center, Sun Yat-sen University, Guangzhou, China
| | - Xiaoyan Ding
- State Key Laboratory of Ophthalmology, Zhongshan Ophthalmic Center, Sun Yat-sen University, Guangzhou, China
| | - Zhan Li
- Zhuhai Women and Children's Hospital, Zhuhai, China
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Cicerone AP, Dailey W, Sun M, Santos A, Jeong D, Jones L, Koustas K, Drekh M, Schmitz K, Haque N, Felisky JA, Guzman AE, Mellert K, Trese MT, Capone A, Drenser KA, Mitton KP. A Survey of Multigenic Protein-Altering Variant Frequency in Familial Exudative Vitreo-Retinopathy (FEVR) Patients by Targeted Sequencing of Seven FEVR-Linked Genes. Genes (Basel) 2022; 13:495. [PMID: 35328049 PMCID: PMC8953269 DOI: 10.3390/genes13030495] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/16/2021] [Revised: 03/04/2022] [Accepted: 03/09/2022] [Indexed: 02/06/2023] Open
Abstract
While Inherited Retinal Diseases (IRDs) are typically considered rare diseases, Familial Exudative Vitreo-Retinopathy (FEVR) and Norrie Disease (ND) are more rare than retinitis pigmentosa. We wanted to determine if multigenic protein-altering variants are common in FEVR subjects within a set of FEVR-related genes. The potential occurrence of protein-altering variants in two different genes has been documented in a very small percentage of patients, but potential multigenic contributions to FEVR remain unclear. Genes involved in these orphan pediatric retinal diseases are not universally included in available IRD targeted-sequencing panels, and cost is also a factor limiting multigenic-sequence-based testing for these rare conditions. To provide an accurate solution at lower cost, we developed a targeted-sequencing protocol that includes seven genes involved in Familial Exudative Vitreo-Retinopathy (FEVR) and Norrie disease. Seventy-six DNA samples from persons refered to clinic with possible FEVR and some close relatives were sequenced using a novel Oakland-ERI orphan pediatric retinal disease panel (version 2) providing 900 times average read coverage. The seven genes involved in FEVR/ND were: NDP (ChrX), CTNNB1 (Chr3); TSPAN12 (Chr7); KIF11 (Chr10), FZD4 (Chr11), LRP5 (Chr11), ZNF408 (Chr11). A total of 33 variants were found that alter protein sequence, with the following relative distribution: LRP5 13/33 (40%), FZD4 9/33 (27%), ZNF408 6/33 (18%), (KIF11 3/33 (9%), NDP 1/33 (3%), CTNNB1 1/33 (3%). Most protein-altering variants, 85%, were found in three genes: FZD4, LRP5, and ZNF408. Four previously known pathogenic variants were detected in five families and two unrelated individuals. Two novel, likely pathogenic variants were detected in one family (FZD4: Cys450ter), and a likely pathogenic frame shift termination variant was detected in one unrelated individual (LRP5: Ala919CysfsTer67). The average number of genes with protein-altering variants was greater in subjects with confirmed FEVR (1.46, n = 30) compared to subjects confirmed unaffected by FEVR (0.95, n = 20), (p = 0.009). Thirty-four percent of persons sequenced had digenic and trigenic protein-altering variants within this set of FEVR genes, which was much greater than expected in the general population (3.6%), as derived from GnomAD data. While the potential contributions to FEVR are not known for most of the variants in a multigenic context, the high multigenic frequency suggests that potential multigenic contributions to FEVR severity warrant future investigation. The targeted-sequencing format developed will support such exploration by reducing the testing cost to $250 (US) for seven genes and facilitating greater access to genetic testing for families with this very rare inherited retinal disease.
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Affiliation(s)
- Amanda Petrelli Cicerone
- Eye Research Institute, Rochester, MI 48309, USA; (A.P.C.); (W.D.); (M.S.); (A.S.); (D.J.); (L.J.); (K.K.); (M.D.); (K.S.); (N.H.); (J.A.F.); (A.E.G.)
| | - Wendy Dailey
- Eye Research Institute, Rochester, MI 48309, USA; (A.P.C.); (W.D.); (M.S.); (A.S.); (D.J.); (L.J.); (K.K.); (M.D.); (K.S.); (N.H.); (J.A.F.); (A.E.G.)
| | - Michael Sun
- Eye Research Institute, Rochester, MI 48309, USA; (A.P.C.); (W.D.); (M.S.); (A.S.); (D.J.); (L.J.); (K.K.); (M.D.); (K.S.); (N.H.); (J.A.F.); (A.E.G.)
- Oakland University William Beaumont School of Medicine, Rochester, MI 48309, USA
| | - Andrew Santos
- Eye Research Institute, Rochester, MI 48309, USA; (A.P.C.); (W.D.); (M.S.); (A.S.); (D.J.); (L.J.); (K.K.); (M.D.); (K.S.); (N.H.); (J.A.F.); (A.E.G.)
- Oakland University William Beaumont School of Medicine, Rochester, MI 48309, USA
| | - Daeun Jeong
- Eye Research Institute, Rochester, MI 48309, USA; (A.P.C.); (W.D.); (M.S.); (A.S.); (D.J.); (L.J.); (K.K.); (M.D.); (K.S.); (N.H.); (J.A.F.); (A.E.G.)
- Oakland University William Beaumont School of Medicine, Rochester, MI 48309, USA
| | - Lance Jones
- Eye Research Institute, Rochester, MI 48309, USA; (A.P.C.); (W.D.); (M.S.); (A.S.); (D.J.); (L.J.); (K.K.); (M.D.); (K.S.); (N.H.); (J.A.F.); (A.E.G.)
- Oakland University William Beaumont School of Medicine, Rochester, MI 48309, USA
| | - Konstaninos Koustas
- Eye Research Institute, Rochester, MI 48309, USA; (A.P.C.); (W.D.); (M.S.); (A.S.); (D.J.); (L.J.); (K.K.); (M.D.); (K.S.); (N.H.); (J.A.F.); (A.E.G.)
- Oakland University William Beaumont School of Medicine, Rochester, MI 48309, USA
| | - Mary Drekh
- Eye Research Institute, Rochester, MI 48309, USA; (A.P.C.); (W.D.); (M.S.); (A.S.); (D.J.); (L.J.); (K.K.); (M.D.); (K.S.); (N.H.); (J.A.F.); (A.E.G.)
- Oakland University William Beaumont School of Medicine, Rochester, MI 48309, USA
| | - Keaton Schmitz
- Eye Research Institute, Rochester, MI 48309, USA; (A.P.C.); (W.D.); (M.S.); (A.S.); (D.J.); (L.J.); (K.K.); (M.D.); (K.S.); (N.H.); (J.A.F.); (A.E.G.)
- Oakland University William Beaumont School of Medicine, Rochester, MI 48309, USA
| | - Naomi Haque
- Eye Research Institute, Rochester, MI 48309, USA; (A.P.C.); (W.D.); (M.S.); (A.S.); (D.J.); (L.J.); (K.K.); (M.D.); (K.S.); (N.H.); (J.A.F.); (A.E.G.)
- Oakland University William Beaumont School of Medicine, Rochester, MI 48309, USA
| | - Jennifer A. Felisky
- Eye Research Institute, Rochester, MI 48309, USA; (A.P.C.); (W.D.); (M.S.); (A.S.); (D.J.); (L.J.); (K.K.); (M.D.); (K.S.); (N.H.); (J.A.F.); (A.E.G.)
| | - Alvaro E. Guzman
- Eye Research Institute, Rochester, MI 48309, USA; (A.P.C.); (W.D.); (M.S.); (A.S.); (D.J.); (L.J.); (K.K.); (M.D.); (K.S.); (N.H.); (J.A.F.); (A.E.G.)
| | - Kendra Mellert
- Associated Retinal Consultants LLC, Royal Oak, MI 48073, USA; (K.M.); (M.T.T.); (A.C.)
| | - Michael T. Trese
- Associated Retinal Consultants LLC, Royal Oak, MI 48073, USA; (K.M.); (M.T.T.); (A.C.)
| | - Antonio Capone
- Associated Retinal Consultants LLC, Royal Oak, MI 48073, USA; (K.M.); (M.T.T.); (A.C.)
| | - Kimberly A. Drenser
- Associated Retinal Consultants LLC, Royal Oak, MI 48073, USA; (K.M.); (M.T.T.); (A.C.)
| | - Kenneth P. Mitton
- Eye Research Institute, Rochester, MI 48309, USA; (A.P.C.); (W.D.); (M.S.); (A.S.); (D.J.); (L.J.); (K.K.); (M.D.); (K.S.); (N.H.); (J.A.F.); (A.E.G.)
- Oakland University William Beaumont School of Medicine, Rochester, MI 48309, USA
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Thulasiram MR, Ogier JM, Dabdoub A. Hearing Function, Degeneration, and Disease: Spotlight on the Stria Vascularis. Front Cell Dev Biol 2022; 10:841708. [PMID: 35309932 PMCID: PMC8931286 DOI: 10.3389/fcell.2022.841708] [Citation(s) in RCA: 12] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/22/2021] [Accepted: 01/20/2022] [Indexed: 11/21/2022] Open
Abstract
The stria vascularis (SV) is a highly vascularized tissue lining the lateral wall of the cochlea. The SV maintains cochlear fluid homeostasis, generating the endocochlear potential that is required for sound transduction. In addition, the SV acts as an important blood-labyrinth barrier, tightly regulating the passage of molecules from the blood into the cochlea. A healthy SV is therefore vital for hearing function. Degeneration of the SV is a leading cause of age-related hearing loss, and has been associated with several hearing disorders, including Norrie disease, Meniere's disease, Alport syndrome, Waardenburg syndrome, and Cytomegalovirus-induced hearing loss. Despite the SV's important role in hearing, there is still much that remains to be discovered, including cell-specific function within the SV, mechanisms of SV degeneration, and potential protective or regenerative therapies. In this review, we discuss recent discoveries elucidating the molecular regulatory networks of SV function, mechanisms underlying degeneration of the SV, and otoprotective strategies for preventing drug-induced SV damage. We also highlight recent clinical developments for treating SV-related hearing loss and discuss future research trajectories in the field.
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Affiliation(s)
- Matsya R Thulasiram
- Department of Laboratory Medicine and Pathobiology, University of Toronto, Toronto, ON, Canada
| | - Jacqueline M Ogier
- Biological Sciences, Sunnybrook Research Institute, Sunnybrook Health Sciences Centre, Toronto, ON, Canada
| | - Alain Dabdoub
- Department of Laboratory Medicine and Pathobiology, University of Toronto, Toronto, ON, Canada
- Biological Sciences, Sunnybrook Research Institute, Sunnybrook Health Sciences Centre, Toronto, ON, Canada
- Department of Otolaryngology–Head and Neck Surgery, University of Toronto, Toronto, ON, Canada
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Idriss LT, Hussain M, Khan M, Ahmad T, Muhammad K, Baig M, Khan MM, Inamullah. Mapping of global research output in congenital cataracts from 1903 to 2021. Medicine (Baltimore) 2021; 100:e27756. [PMID: 35049169 PMCID: PMC9191315 DOI: 10.1097/md.0000000000027756] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/26/2021] [Accepted: 10/27/2021] [Indexed: 01/15/2023] Open
Abstract
BACKGROUND AND AIM Globally, congenital cataract remains one of the main causes of visual loss in children. This study was designed to plot the overall research output and evaluate some key bibliometric indicators in congenital cataracts research. METHODS Publications on congenital cataracts were retrieved from the Web of Science Core Collection database. The published literature was searched using the keywords "congenital cataract" OR "congenital cataracts" in the title filed with document types and language restrictions. The data were exported into HistCite to analyze; publication year, top authors, countries, institutions, journals, keywords, and most cited studies. VOSviewer software was used to construct network visualization mapping. RESULTS A total of 1427 publications (1903-2021) published in English language were included in this study. Over the past few decades, the total number of publications in congenital cataracts was found to be increased. The most productive year was 2016 (n = 72), while the most cited year was 1941 (1268 citations). The Investigative Ophthalmology & Visual Science (Impact Factor: 4.799) was the most attractive journal with 161 publications, and the Molecular Vision (Impact Factor : 2.367) was the most cited journal with 1915 citations and 161.723 citations per year. The most productive country was the United States of America (USA) (n = 325), while the most active institute was Sun Yat-sen University, China (n = 36). The most prolific author was Yao K (n = 27). The most studied Web of Science category was ophthalmology (n = 852). The most widely used keyword was congenital (n = 1427). The most cited paper in congenital cataracts was "Congenital cataract following German measles in the mother, cited 1268 times. The USA and author keyword congenital cataract had the highest total link strength. CONCLUSION These findings provide useful insights, current status, and trends in clinical research in congenital cataracts. This study can be used to identify future research areas and standard bibliography references for better diagnosis and disease control.
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Affiliation(s)
- Lujain Talaat Idriss
- Department of Ophthalmology, Faculty of Medicine, Rabigh, King Abdulaziz University, Jeddah, Saudi Arabia
| | - Maryam Hussain
- Department of Biotechnology and Genetic Engineering, Hazara University Mansehra, Mansehra, Khyber Pakhtunkhwa, Islamic Republic of Pakistan
| | - Muhammad Khan
- Department of Biotechnology and Genetic Engineering, Hazara University Mansehra, Mansehra, Khyber Pakhtunkhwa, Islamic Republic of Pakistan
| | - Tauseef Ahmad
- Department of Epidemiology and Health Statistics, School of Public Health, Southeast University, Nanjing, China
| | - Khushi Muhammad
- Department of Biotechnology and Genetic Engineering, Hazara University Mansehra, Mansehra, Khyber Pakhtunkhwa, Islamic Republic of Pakistan
| | - Mukhtiar Baig
- Department of Clinical Biochemistry, Faculty of Medicine Rabigh, King Abdulaziz University, Jeddah, Saudi Arabia
| | - Muhammad Mumtaz Khan
- Department of Microbiology, University of Haripur, Haripur, Khyber Pakhtunkhwa, Islamic Republic of Pakistan
| | - Inamullah
- Department of Biotechnology and Genetic Engineering, Hazara University Mansehra, Mansehra, Khyber Pakhtunkhwa, Islamic Republic of Pakistan
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Morris M, Kwon R, Chen L. Pediatric Idiopathic Basal Ganglia Calcification and Spherocytosis With Chromosome 8p11 Deletion. J Neuropathol Exp Neurol 2020; 79:238-241. [PMID: 31913475 DOI: 10.1093/jnen/nlz133] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/12/2019] [Indexed: 01/01/2023] Open
Abstract
Idiopathic basal ganglia calcification (IBGC), also known as Fahr disease, is a rare neurodegenerative disorder characterized by the accumulation of extensive parenchymal and vascular calcifications in the basal ganglia, with variable calcifications elsewhere in the brain. Typically, IBGC presents with neurologic and psychiatric symptoms in middle-aged adults. Recent genetic studies have identified alterations in 4 genes causing IBGC, including alterations in SLC20A2 on chromosome 8p11.2. Currently, there are no clinical descriptions of patients with IBGC occurring within the context of a complex genetic syndrome. Here, we present a case of pediatric 8p11 deletion with IBGC, hereditary spherocytosis, vitreoretinopathy, and focal cortical dysplasia. We review multiple cases of IBGC with pediatric onset due to SLC20A2 deletion in the literature, and raise the consideration of IBGC in the evaluation of pediatric patients with 8p11.2 deletion syndromes.
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Affiliation(s)
- Meaghan Morris
- From the Department of Pathology, Johns Hopkins University School of Medicine, Baltimore, Maryland
| | - Regina Kwon
- From the Department of Pathology, Johns Hopkins University School of Medicine, Baltimore, Maryland
| | - Liam Chen
- From the Department of Pathology, Johns Hopkins University School of Medicine, Baltimore, Maryland
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Liu J, Zhu J, Yang J, Zhang X, Zhang Q, Zhao P. Prenatal diagnosis of familial exudative vitreoretinopathy and Norrie disease. Mol Genet Genomic Med 2018; 7:e00503. [PMID: 30474316 PMCID: PMC6382493 DOI: 10.1002/mgg3.503] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/22/2018] [Revised: 06/10/2018] [Accepted: 10/10/2018] [Indexed: 11/27/2022] Open
Abstract
Background Both familial exudative vitreoretinopathy (FEVR) and Norrie disease (ND) are hereditary retinal disorders which can cause severe visual impairment and blindness at a young age. The present study aimed to report the use of antenatal genetic testing and ultrasound in the diagnosis and counseling of FEVR and ND. Methods Amniocentesis and ultrasonography were performed in high‐risk mothers, with children having FEVR or ND, to predict severe ocular abnormalities. Results Case 1: A homozygous NDP mutation (c.376T>C, NM_000266) was detected in the proband and his mother. Molecular prenatal analysis of the fetal DNA revealed no mutations. No ocular abnormalities were detected on ultrasonography. The pregnancy progressed uneventfully to a normal outcome. Case 2: A novel heterozygous FZD4 mutation (c.1010dupA, NM_012193) was detected in the proband and his mother. The same mutation was detected in the fetus, but ultrasonography showed no ocular abnormalities. A healthy baby boy with stage 1 FEVR was born after an uneventful pregnancy. Case 3: Deletions of exons 2 and 3 in the NDP were found in the proband and his mother. The same deletion mutation was detected in the female fetus, but the ultrasound scan was normal. The pregnancy progressed uneventfully to a normal outcome. Conclusions To our knowledge, antenatal genetic analyses were used in conjunction with ultrasound for the first time, to diagnose FEVR and ND, and predict the postnatal prognoses in at‐risk babies.
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Affiliation(s)
- Jingjing Liu
- Shanghai Jiao Tong University School of Medicine Affiliated Xinhua Hospital, Shanghai, China
| | - Jing Zhu
- Shanghai Jiao Tong University School of Medicine Affiliated Xinhua Hospital, Shanghai, China
| | - Jiyun Yang
- Sichuan Provincial People's Hospital, Chengdu, China
| | - Xiang Zhang
- Shanghai Jiao Tong University School of Medicine Affiliated Xinhua Hospital, Shanghai, China
| | - Qi Zhang
- Shanghai Jiao Tong University School of Medicine Affiliated Xinhua Hospital, Shanghai, China
| | - Peiquan Zhao
- Shanghai Jiao Tong University School of Medicine Affiliated Xinhua Hospital, Shanghai, China
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