1
|
Kaylor JJ, Frederiksen R, Bedrosian CK, Huang M, Stennis-Weatherspoon D, Huynh T, Ngan T, Mulamreddy V, Sampath AP, Fain GL, Travis GH. RDH12 allows cone photoreceptors to regenerate opsin visual pigments from a chromophore precursor to escape competition with rods. Curr Biol 2024; 34:3342-3353.e6. [PMID: 38981477 PMCID: PMC11303097 DOI: 10.1016/j.cub.2024.06.031] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/20/2024] [Revised: 05/11/2024] [Accepted: 06/10/2024] [Indexed: 07/11/2024]
Abstract
Capture of a photon by an opsin visual pigment isomerizes its 11-cis-retinaldehyde (11cRAL) chromophore to all-trans-retinaldehyde (atRAL), which subsequently dissociates. To restore light sensitivity, the unliganded apo-opsin combines with another 11cRAL to make a new visual pigment. Two enzyme pathways supply chromophore to photoreceptors. The canonical visual cycle in retinal pigment epithelial cells supplies 11cRAL at low rates. The photic visual cycle in Müller cells supplies cones with 11-cis-retinol (11cROL) chromophore precursor at high rates. Although rods can only use 11cRAL to regenerate rhodopsin, cones can use 11cRAL or 11cROL to regenerate cone visual pigments. We performed a screen in zebrafish retinas and identified ZCRDH as a candidate for the enzyme that converts 11cROL to 11cRAL in cone inner segments. Retinoid analysis of eyes from Zcrdh-mutant zebrafish showed reduced 11cRAL and increased 11cROL levels, suggesting impaired conversion of 11cROL to 11cRAL. By microspectrophotometry, isolated Zcrdh-mutant cones lost the capacity to regenerate visual pigments from 11cROL. ZCRDH therefore possesses all predicted properties of the cone 11cROL dehydrogenase. The human protein most similar to ZCRDH is RDH12. By immunocytochemistry, ZCRDH was abundantly present in cone inner segments, similar to the reported distribution of RDH12. Finally, RDH12 was the only mammalian candidate protein to exhibit 11cROL-oxidase catalytic activity. These observations suggest that RDH12 in mammals is the functional ortholog of ZCRDH, which allows cones, but not rods, to regenerate visual pigments from 11cROL provided by Müller cells. This capacity permits cones to escape competition from rods for visual chromophore in daylight-exposed retinas.
Collapse
Affiliation(s)
- Joanna J Kaylor
- University of California, Los Angeles, David Geffen School of Medicine, Department of Ophthalmology, 405 Hilgard Avenue, Los Angeles, CA 90095, USA
| | - Rikard Frederiksen
- University of California, Los Angeles, David Geffen School of Medicine, Department of Ophthalmology, 405 Hilgard Avenue, Los Angeles, CA 90095, USA
| | - Christina K Bedrosian
- University of California, Los Angeles, David Geffen School of Medicine, Department of Ophthalmology, 405 Hilgard Avenue, Los Angeles, CA 90095, USA
| | - Melody Huang
- University of California, Los Angeles, David Geffen School of Medicine, Department of Ophthalmology, 405 Hilgard Avenue, Los Angeles, CA 90095, USA
| | - David Stennis-Weatherspoon
- University of California, Los Angeles, David Geffen School of Medicine, Department of Ophthalmology, 405 Hilgard Avenue, Los Angeles, CA 90095, USA
| | - Theodore Huynh
- University of California, Los Angeles, David Geffen School of Medicine, Department of Ophthalmology, 405 Hilgard Avenue, Los Angeles, CA 90095, USA
| | - Tiffany Ngan
- University of California, Los Angeles, David Geffen School of Medicine, Department of Ophthalmology, 405 Hilgard Avenue, Los Angeles, CA 90095, USA
| | - Varsha Mulamreddy
- University of California, Los Angeles, David Geffen School of Medicine, Department of Ophthalmology, 405 Hilgard Avenue, Los Angeles, CA 90095, USA
| | - Alapakkam P Sampath
- University of California, Los Angeles, David Geffen School of Medicine, Department of Ophthalmology, 405 Hilgard Avenue, Los Angeles, CA 90095, USA
| | - Gordon L Fain
- University of California, Los Angeles, David Geffen School of Medicine, Department of Ophthalmology, 405 Hilgard Avenue, Los Angeles, CA 90095, USA
| | - Gabriel H Travis
- University of California, Los Angeles, David Geffen School of Medicine, Department of Ophthalmology, 405 Hilgard Avenue, Los Angeles, CA 90095, USA; University of California Los Angeles, Department of Biological Chemistry, 405 Hilgard Avenue, Los Angeles, CA 90095, USA.
| |
Collapse
|
2
|
Cerolini S, Bennett J, Leroy BP, Durham T, Coates C, Pletcher MT, Lacey S, Aleman TS. Report From the Second Global Scientific Conference on Clinical Trial Design and Outcome Measures for RDH12-Associated Inherited Retinal Degeneration. Transl Vis Sci Technol 2024; 13:17. [PMID: 39120885 PMCID: PMC11318357 DOI: 10.1167/tvst.13.8.17] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/30/2024] [Accepted: 06/22/2024] [Indexed: 08/10/2024] Open
Abstract
Translational Relevance A multi-stakeholder, patient centric approach will be critical to the design of future successful clinical trials with outcome measures relevant to the RDH12-IRD population.
Collapse
Affiliation(s)
| | - Jean Bennett
- Scheie Eye Institute, Department of Ophthalmology, Perelman School of Medicine, University of Pennsylvania, Philadelphia, PA, USA
| | - Bart P. Leroy
- Department of Ophthalmology and Center for Medical Genetics, Ghent University Hospital and Department of Head & Skin, Ghent University, Ghent, Belgium
| | - Todd Durham
- Foundation Fighting Blindness, Columbia, MD, USA
| | | | | | - Sue Lacey
- Astraea Medical Consulting, Hindhead, UK
| | - Tomas S. Aleman
- Scheie Eye Institute, Department of Ophthalmology, Perelman School of Medicine, University of Pennsylvania, Philadelphia, PA, USA
| |
Collapse
|
3
|
Daich Varela M, Moya R, Azevedo Souza Amaral R, Schlottmann PG, Álvarez Mendiara A, Francone A, Guazi Resende R, Capalbo L, Gelvez N, López G, Morales-Acevedo AM, Ossa RH, Arno G, Michaelides M, Tamayo ML, Ferraz Sallum JM. Clinical and Genetic Characterization of RDH12-Retinal Dystrophy in a South American Cohort. Ophthalmol Retina 2024; 8:163-173. [PMID: 37714431 DOI: 10.1016/j.oret.2023.09.007] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/27/2023] [Revised: 08/30/2023] [Accepted: 09/06/2023] [Indexed: 09/17/2023]
Abstract
PURPOSE To characterize the largest cohort of individuals with retinol dehydrogenase 12 (RDH12)-retinal dystrophy to date, and the first one from South America. DESIGN Retrospective multicenter international study. SUBJECTS Seventy-eight patients (66 families) with an inherited retinal dystrophy and biallelic variants in RDH12. METHODS Review of clinical notes, ophthalmic images, and molecular diagnosis. MAIN OUTCOME MEASURES Visual function, retinal imaging, and characteristics were evaluated and correlated. RESULTS Thirty-seven individuals self-identified as Latino (51%) and 34 as White (47%). Sixty-nine individuals (88%) had Leber congenital amaurosis (LCA)/early-onset severe retinal dystrophy. Macular and midperipheral atrophy were seen in all patients from 3 years of age. A novel retinal finding was a hyperautofluorescent ring in 2 young children with LCA. Thirty-nine patients (50%) had subsequent visits, with mean follow-up of 6.8 ± 7.3 (range, 0-29) years. Eight variants (21%) were previously unreported, and the most frequent variant was c.295C>A, p.Leu99Ile, present in 52 alleles of 32 probands. Individuals with LCA homozygous for p.Leu99Ile (31%) had a later age of onset, a slower rate of best-corrected visual acuity decrease, the largest percentage of patients with mild visual impairment, and were predicted to reach legal blindness at an older age than the rest of the cohort. CONCLUSIONS By describing the largest molecularly confirmed cohort to date, improved understanding of disease progression was possible. Our detailed characterization aims to support research and the development of novel therapies that may have the potential to reduce or prevent vision loss in individuals with RDH12-associated retinal dystrophy. FINANCIAL DISCLOSURE(S) Proprietary or commercial disclosure may be found in the Footnotes and Disclosures.
Collapse
Affiliation(s)
- Malena Daich Varela
- Moorfields Eye Hospital, London, United Kingdom; UCL Institute of Ophthalmology, University College London, London, United Kingdom.
| | - Rene Moya
- Departamento de Retina y Departamento de Genética Ocular, Hospital del Salvador, Universidad de Chile, Santiago, Chile
| | - Rebeca Azevedo Souza Amaral
- Ophthalmology Department, Federal University of São Paulo (UNIFESP), São Paulo, Brazil; Instituto de Genética Ocular, São Paulo, Brazil
| | | | | | | | | | | | - Nancy Gelvez
- Instituto de Genética Humana, Pontificia Universidad Javeriana, Bogotá, Colombia
| | - Greizy López
- Instituto de Genética Humana, Pontificia Universidad Javeriana, Bogotá, Colombia
| | | | - Rafael H Ossa
- Instituto de Genética Humana, Pontificia Universidad Javeriana, Bogotá, Colombia
| | - Gavin Arno
- Moorfields Eye Hospital, London, United Kingdom; UCL Institute of Ophthalmology, University College London, London, United Kingdom
| | - Michel Michaelides
- Moorfields Eye Hospital, London, United Kingdom; UCL Institute of Ophthalmology, University College London, London, United Kingdom
| | - Martha L Tamayo
- Instituto de Genética Humana, Pontificia Universidad Javeriana, Bogotá, Colombia
| | - Juliana Maria Ferraz Sallum
- Ophthalmology Department, Federal University of São Paulo (UNIFESP), São Paulo, Brazil; Instituto de Genética Ocular, São Paulo, Brazil
| |
Collapse
|
4
|
Dueñas Rey A, Del Pozo Valero M, Bouckaert M, Wood KA, Van den Broeck F, Daich Varela M, Thomas HB, Van Heetvelde M, De Bruyne M, Van de Sompele S, Bauwens M, Lenaerts H, Mahieu Q, Josifova D, Rivolta C, O'Keefe RT, Ellingford J, Webster AR, Arno G, Ayuso C, De Zaeytijd J, Leroy BP, De Baere E, Coppieters F. Combining a prioritization strategy and functional studies nominates 5'UTR variants underlying inherited retinal disease. Genome Med 2024; 16:7. [PMID: 38184646 PMCID: PMC10771650 DOI: 10.1186/s13073-023-01277-1] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/16/2023] [Accepted: 12/15/2023] [Indexed: 01/08/2024] Open
Abstract
BACKGROUND 5' untranslated regions (5'UTRs) are essential modulators of protein translation. Predicting the impact of 5'UTR variants is challenging and rarely performed in routine diagnostics. Here, we present a combined approach of a comprehensive prioritization strategy and functional assays to evaluate 5'UTR variation in two large cohorts of patients with inherited retinal diseases (IRDs). METHODS We performed an isoform-level re-analysis of retinal RNA-seq data to identify the protein-coding transcripts of 378 IRD genes with highest expression in retina. We evaluated the coverage of their 5'UTRs by different whole exome sequencing (WES) kits. The selected 5'UTRs were analyzed in whole genome sequencing (WGS) and WES data from IRD sub-cohorts from the 100,000 Genomes Project (n = 2397 WGS) and an in-house database (n = 1682 WES), respectively. Identified variants were annotated for 5'UTR-relevant features and classified into seven categories based on their predicted functional consequence. We developed a variant prioritization strategy by integrating population frequency, specific criteria for each category, and family and phenotypic data. A selection of candidate variants underwent functional validation using diverse approaches. RESULTS Isoform-level re-quantification of retinal gene expression revealed 76 IRD genes with a non-canonical retina-enriched isoform, of which 20 display a fully distinct 5'UTR compared to that of their canonical isoform. Depending on the probe design, 3-20% of IRD genes have 5'UTRs fully captured by WES. After analyzing these regions in both cohorts, we prioritized 11 (likely) pathogenic variants in 10 genes (ARL3, MERTK, NDP, NMNAT1, NPHP4, PAX6, PRPF31, PRPF4, RDH12, RD3), of which 7 were novel. Functional analyses further supported the pathogenicity of three variants. Mis-splicing was demonstrated for the PRPF31:c.-9+1G>T variant. The MERTK:c.-125G>A variant, overlapping a transcriptional start site, was shown to significantly reduce both luciferase mRNA levels and activity. The RDH12:c.-123C>T variant was found in cis with the hypomorphic RDH12:c.701G>A (p.Arg234His) variant in 11 patients. This 5'UTR variant, predicted to introduce an upstream open reading frame, was shown to result in reduced RDH12 protein but unaltered mRNA levels. CONCLUSIONS This study demonstrates the importance of 5'UTR variants implicated in IRDs and provides a systematic approach for 5'UTR annotation and validation that is applicable to other inherited diseases.
Collapse
Affiliation(s)
- Alfredo Dueñas Rey
- Center for Medical Genetics Ghent (CMGG), Ghent University Hospital, Ghent, Belgium
- Department of Biomolecular Medicine, Ghent University, Corneel Heymanslaan 10, Ghent, 9000, Belgium
| | - Marta Del Pozo Valero
- Center for Medical Genetics Ghent (CMGG), Ghent University Hospital, Ghent, Belgium
- Department of Biomolecular Medicine, Ghent University, Corneel Heymanslaan 10, Ghent, 9000, Belgium
- Department of Genetics, Instituto de Investigación Sanitaria-Fundación Jiménez Díaz, University Hospital, Universidad Autónoma de Madrid (IIS-FJD, UAM), Madrid, Spain
| | - Manon Bouckaert
- Center for Medical Genetics Ghent (CMGG), Ghent University Hospital, Ghent, Belgium
- Department of Biomolecular Medicine, Ghent University, Corneel Heymanslaan 10, Ghent, 9000, Belgium
| | - Katherine A Wood
- Division of Evolution, Infection and Genomics, School of Biological Sciences, Faculty of Biology, Medicines and Health, University of Manchester, Manchester, UK
| | - Filip Van den Broeck
- Department of Ophthalmology, Ghent University Hospital, Ghent, Belgium
- Department of Head & Skin, Ghent University, Ghent, Belgium
| | - Malena Daich Varela
- UCL Institute of Ophthalmology, University College London, London, UK
- Moorfields Eye Hospital, London, UK
| | - Huw B Thomas
- Division of Evolution, Infection and Genomics, School of Biological Sciences, Faculty of Biology, Medicines and Health, University of Manchester, Manchester, UK
| | - Mattias Van Heetvelde
- Center for Medical Genetics Ghent (CMGG), Ghent University Hospital, Ghent, Belgium
- Department of Biomolecular Medicine, Ghent University, Corneel Heymanslaan 10, Ghent, 9000, Belgium
| | - Marieke De Bruyne
- Center for Medical Genetics Ghent (CMGG), Ghent University Hospital, Ghent, Belgium
- Department of Biomolecular Medicine, Ghent University, Corneel Heymanslaan 10, Ghent, 9000, Belgium
| | - Stijn Van de Sompele
- Center for Medical Genetics Ghent (CMGG), Ghent University Hospital, Ghent, Belgium
- Department of Biomolecular Medicine, Ghent University, Corneel Heymanslaan 10, Ghent, 9000, Belgium
| | - Miriam Bauwens
- Center for Medical Genetics Ghent (CMGG), Ghent University Hospital, Ghent, Belgium
- Department of Biomolecular Medicine, Ghent University, Corneel Heymanslaan 10, Ghent, 9000, Belgium
| | - Hanne Lenaerts
- Center for Medical Genetics Ghent (CMGG), Ghent University Hospital, Ghent, Belgium
- Department of Biomolecular Medicine, Ghent University, Corneel Heymanslaan 10, Ghent, 9000, Belgium
| | - Quinten Mahieu
- Center for Medical Genetics Ghent (CMGG), Ghent University Hospital, Ghent, Belgium
- Department of Biomolecular Medicine, Ghent University, Corneel Heymanslaan 10, Ghent, 9000, Belgium
| | | | - Carlo Rivolta
- Department of Ophthalmology, University of Basel, Basel, Switzerland
- Institute of Molecular and Clinical Ophthalmology Basel (IOB), Basel, Switzerland
- Department of Genetics and Genome Biology, University of Leicester, Leicester, UK
| | - Raymond T O'Keefe
- Division of Evolution, Infection and Genomics, School of Biological Sciences, Faculty of Biology, Medicines and Health, University of Manchester, Manchester, UK
| | - Jamie Ellingford
- Division of Evolution, Infection and Genomics, School of Biological Sciences, Faculty of Biology, Medicines and Health, University of Manchester, Manchester, UK
- Genomics England, London, UK
- Manchester Centre for Genomic Medicine, St Mary's Hospital, Manchester University NHS Foundation Trust, Manchester, UK
| | - Andrew R Webster
- UCL Institute of Ophthalmology, University College London, London, UK
- Moorfields Eye Hospital, London, UK
| | - Gavin Arno
- UCL Institute of Ophthalmology, University College London, London, UK
- Moorfields Eye Hospital, London, UK
| | - Carmen Ayuso
- Department of Genetics, Instituto de Investigación Sanitaria-Fundación Jiménez Díaz, University Hospital, Universidad Autónoma de Madrid (IIS-FJD, UAM), Madrid, Spain
- Center for Biomedical Network Research on Rare Diseases (CIBERER), Instituto de Salud Carlos III, Madrid, Spain
| | - Julie De Zaeytijd
- Department of Ophthalmology, Ghent University Hospital, Ghent, Belgium
- Department of Head & Skin, Ghent University, Ghent, Belgium
| | - Bart P Leroy
- Center for Medical Genetics Ghent (CMGG), Ghent University Hospital, Ghent, Belgium
- Department of Ophthalmology, Ghent University Hospital, Ghent, Belgium
- Department of Head & Skin, Ghent University, Ghent, Belgium
- Division of Ophthalmology, Children's Hospital of Philadelphia, Philadelphia, PA, USA
| | - Elfride De Baere
- Center for Medical Genetics Ghent (CMGG), Ghent University Hospital, Ghent, Belgium
- Department of Biomolecular Medicine, Ghent University, Corneel Heymanslaan 10, Ghent, 9000, Belgium
| | - Frauke Coppieters
- Center for Medical Genetics Ghent (CMGG), Ghent University Hospital, Ghent, Belgium.
- Department of Biomolecular Medicine, Ghent University, Corneel Heymanslaan 10, Ghent, 9000, Belgium.
- Department of Pharmaceutics, Ghent University, Ghent, Belgium.
| |
Collapse
|
5
|
Kuo CY, Chung MY, Chen SJ. Pseudocoloboma-like maculopathy with biallelic RDH12 missense mutations. J Med Genet 2023; 60:859-865. [PMID: 36690427 PMCID: PMC10447408 DOI: 10.1136/jmg-2022-108918] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/04/2022] [Accepted: 01/02/2023] [Indexed: 01/25/2023]
Abstract
BACKGROUND Hereditary maculopathy is a group of clinically and genetically heterogeneous disorders. With distinctive clinical features, subtypes of macular atrophy may correlate with their genetic defects. METHODS Seven patients from six families with adolescent/adult-onset maculopathy were examined in this clinical case series. A detailed medical history and eye examination were performed. Genomic DNA sequencing was performed using whole exome sequencing or direct sequencing of retinol dehydrogenase 12 (RDH12) coding exons. RESULTS Seven patients, including one male and six female patients, with pseudocoloboma-like maculopathy had biallelic missense RDH12 mutations. The most common mutant allele found in six of the seven patients was p.Ala269Gly. The average disease onset was at age 19.3 years, and visual acuity ranged from count fingers to 1.0. Most of the patients had mild myopic refraction. Common findings on fundus examination and spectral-domain optical coherence tomography include discrete margins of pseudocoloboma-like macular lesions with variable degrees of chorioretinal atrophy, excavation of retinal tissue and pigmentary changes mainly in the macular area. The electroretinograms were relatively normal to subnormal in all participants. CONCLUSIONS Progressive macular degeneration with a relatively normal peripheral retina and subsequent development of a pseudocoloboma-like appearance were the main clinical features in patients with compound heterozygous RDH12 missense mutations. Genetic testing may be crucial for early diagnosis and may play a key role in the development of future treatment strategies.
Collapse
Affiliation(s)
- Che-Yuan Kuo
- Department of Ophthalmology, Taipei Veterans General Hospital, Taipei, Taiwan
- Department of Ophthalmology, National Yang Ming Chiao Tung University, Taipei, Taiwan
| | - Ming-Yi Chung
- Department of Life Sciences & Institute of Genome Sciences, National Yang Ming Chiao Tung University, Taipei, Taiwan
- Department of Medical Research, Taipei Veterans General Hospital, Taipei, Taiwan
| | - Shih-Jen Chen
- Department of Ophthalmology, Taipei Veterans General Hospital, Taipei, Taiwan
- Department of Ophthalmology, National Yang Ming Chiao Tung University, Taipei, Taiwan
| |
Collapse
|
6
|
Parmann R, Tsang SH, Sparrow JR. Primary versus Secondary Elevations in Fundus Autofluorescence. Int J Mol Sci 2023; 24:12327. [PMID: 37569703 PMCID: PMC10419315 DOI: 10.3390/ijms241512327] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/08/2023] [Revised: 07/25/2023] [Accepted: 07/31/2023] [Indexed: 08/13/2023] Open
Abstract
The method of quantitative fundus autofluorescence (qAF) can be used to assess the levels of bisretinoids in retinal pigment epithelium (RPE) cells so as to aid the interpretation and management of a variety of retinal conditions. In this review, we focused on seven retinal diseases to highlight the possible pathways to increased fundus autofluorescence. ABCA4- and RDH12-associated diseases benefit from known mechanisms whereby gene malfunctioning leads to elevated bisretinoid levels in RPE cells. On the other hand, peripherin2/RDS-associated disease (PRPH2/RDS), retinitis pigmentosa (RP), central serous chorioretinopathy (CSC), acute zonal occult outer retinopathy (AZOOR), and ceramide kinase like (CERKL)-associated retinal degeneration all express abnormally high fundus autofluorescence levels without a demonstrated pathophysiological pathway for bisretinoid elevation. We suggest that, while a known link from gene mutation to increased production of bisretinoids (as in ABCA4- and RDH12-associated diseases) causes primary elevation in fundus autofluorescence, a secondary autofluorescence elevation also exists, where an impairment and degeneration of photoreceptor cells by various causes leads to an increase in bisretinoid levels in RPE cells.
Collapse
Affiliation(s)
- Rait Parmann
- Departments of Ophthalmology, Columbia University, 635 W. 165th Street, New York, NY 10032, USA
| | - Stephen H. Tsang
- Departments of Ophthalmology, Columbia University, 635 W. 165th Street, New York, NY 10032, USA
- Departments of Pathology and Cell Biology, Columbia University, 635 W. 165th Street, New York, NY 10032, USA
| | - Janet R. Sparrow
- Departments of Ophthalmology, Columbia University, 635 W. 165th Street, New York, NY 10032, USA
- Departments of Pathology and Cell Biology, Columbia University, 635 W. 165th Street, New York, NY 10032, USA
| |
Collapse
|
7
|
Wang J, Wang Y, Li S, Xiao X, Yi Z, Jiang Y, Li X, Jia X, Wang P, Jin C, Sun W, Zhang Q. Clinical and Genetic Analysis of RDH12-Associated Retinopathy in 27 Chinese Families: A Hypomorphic Allele Leads to Cone-Rod Dystrophy. Invest Ophthalmol Vis Sci 2022; 63:24. [PMID: 35994252 PMCID: PMC9419460 DOI: 10.1167/iovs.63.9.24] [Citation(s) in RCA: 8] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022] Open
Abstract
Purpose The purpose of this study was to elucidate the genetic basis of 2 distinct phenotypes associated with biallelic variants in RDH12. Methods Patients with biallelic variants in RDH12 were recruited from our genetic eye clinic. Ocular phenotypes were evaluated. Genotype-phenotype correlations were further clarified using in-house and existing databases. Results In total, 22 biallelic RDH12 variants, including 5 novel variants, were identified in 29 patients from 27 families. Two distinct phenotypes were observed: early-onset and generalized retinal dystrophy with severe impairment of rods and cones in 24 patients (82.8%, 24/29), and late-onset cone-rod dystrophy (CORD) with central macular atrophy in 5 patients from 5 unrelated families (17.2%, 5/29), in which a hypomorphic allele (c.806C>G/p.Ala269Gly) was shared by all 5 patients. During follow-up, patients with late-onset CORD were relatively stable and did not progress to the severe form, which was considered to be an independent manifestation of RDH12-associated retinopathy caused by specific genotypes. Conclusions The hypomorphic allele is responsible for the unique late-onset CORD in 5 families with recessive RDH12-associated retinopathy, in contrast to the well-known severe and generalized retinopathy. Determining the therapeutic value of interventions may depend on understanding the molecular mechanisms underlying manifestation of this hypomorphic variant only in the central macular region, with relative preservation of the peripheral retina.
Collapse
Affiliation(s)
- Junwen Wang
- State Key Laboratory of Ophthalmology, Zhongshan Ophthalmic Center, Sun Yat-sen University, Guangdong Provincial Key Laboratory of Ophthalmology and Visual Science, Guangzhou, China
| | - Yingwei Wang
- State Key Laboratory of Ophthalmology, Zhongshan Ophthalmic Center, Sun Yat-sen University, Guangdong Provincial Key Laboratory of Ophthalmology and Visual Science, Guangzhou, China
| | - Shiqiang Li
- State Key Laboratory of Ophthalmology, Zhongshan Ophthalmic Center, Sun Yat-sen University, Guangdong Provincial Key Laboratory of Ophthalmology and Visual Science, Guangzhou, China
| | - Xueshan Xiao
- State Key Laboratory of Ophthalmology, Zhongshan Ophthalmic Center, Sun Yat-sen University, Guangdong Provincial Key Laboratory of Ophthalmology and Visual Science, Guangzhou, China
| | - Zhen Yi
- State Key Laboratory of Ophthalmology, Zhongshan Ophthalmic Center, Sun Yat-sen University, Guangdong Provincial Key Laboratory of Ophthalmology and Visual Science, Guangzhou, China
| | - Yi Jiang
- State Key Laboratory of Ophthalmology, Zhongshan Ophthalmic Center, Sun Yat-sen University, Guangdong Provincial Key Laboratory of Ophthalmology and Visual Science, Guangzhou, China
| | - Xueqing Li
- State Key Laboratory of Ophthalmology, Zhongshan Ophthalmic Center, Sun Yat-sen University, Guangdong Provincial Key Laboratory of Ophthalmology and Visual Science, Guangzhou, China
| | - Xiaoyun Jia
- State Key Laboratory of Ophthalmology, Zhongshan Ophthalmic Center, Sun Yat-sen University, Guangdong Provincial Key Laboratory of Ophthalmology and Visual Science, Guangzhou, China
| | - Panfeng Wang
- State Key Laboratory of Ophthalmology, Zhongshan Ophthalmic Center, Sun Yat-sen University, Guangdong Provincial Key Laboratory of Ophthalmology and Visual Science, Guangzhou, China
| | - Chenjin Jin
- State Key Laboratory of Ophthalmology, Zhongshan Ophthalmic Center, Sun Yat-sen University, Guangdong Provincial Key Laboratory of Ophthalmology and Visual Science, Guangzhou, China
| | - Wenmin Sun
- State Key Laboratory of Ophthalmology, Zhongshan Ophthalmic Center, Sun Yat-sen University, Guangdong Provincial Key Laboratory of Ophthalmology and Visual Science, Guangzhou, China
| | - Qingjiong Zhang
- State Key Laboratory of Ophthalmology, Zhongshan Ophthalmic Center, Sun Yat-sen University, Guangdong Provincial Key Laboratory of Ophthalmology and Visual Science, Guangzhou, China
| |
Collapse
|
8
|
Bouzidi A, Charoute H, Charif M, Amalou G, Kandil M, Barakat A, Lenaers G. Clinical and genetic spectrums of 413 North African families with inherited retinal dystrophies and optic neuropathies. Orphanet J Rare Dis 2022; 17:197. [PMID: 35551639 PMCID: PMC9097391 DOI: 10.1186/s13023-022-02340-7] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/18/2021] [Accepted: 04/26/2022] [Indexed: 11/26/2022] Open
Abstract
Background Inherited retinal dystrophies (IRD) and optic neuropathies (ION) are the two major causes world-wide of early visual impairment, frequently leading to legal blindness. These two groups of pathologies are highly heterogeneous and require combined clinical and molecular diagnoses to be securely identified. Exact epidemiological studies are lacking in North Africa, and genetic studies of IRD and ION individuals are often limited to case reports or to some families that migrated to the rest of the world. In order to improve the knowledge of their clinical and genetic spectrums in North Africa, we reviewed published data, to illustrate the most prevalent pathologies, genes and mutations encountered in this geographical region, extending from Morocco to Egypt, comprising 200 million inhabitants. Main body We compiled data from 413 families with IRD or ION together with their available molecular diagnosis. The proportion of IRD represents 82.8% of index cases, while ION accounted for 17.8%. Non-syndromic IRD were more frequent than syndromic ones, with photoreceptor alterations being the main cause of non-syndromic IRD, represented by retinitis pigmentosa, Leber congenital amaurosis, and cone-rod dystrophies, while ciliopathies constitute the major part of syndromic-IRD, in which the Usher and Bardet Biedl syndromes occupy 41.2% and 31.1%, respectively. We identified 71 ION families, 84.5% with a syndromic presentation, while surprisingly, non-syndromic ION are scarcely reported, with only 11 families with autosomal recessive optic atrophies related to OPA7 and OPA10 variants, or with the mitochondrial related Leber ION. Overall, consanguinity is a major cause of these diseases within North African countries, as 76.1% of IRD and 78.8% of ION investigated families were consanguineous, explaining the high rate of autosomal recessive inheritance pattern compared to the dominant one. In addition, we identified many founder mutations in small endogamous communities. Short conclusion As both IRD and ION diseases constitute a real public health burden, their under-diagnosis in North Africa due to the absence of physicians trained to the identification of inherited ophthalmologic presentations, together with the scarcity of tools for the molecular diagnosis represent major political, economic and health challenges for the future, to first establish accurate clinical diagnoses and then treat patients with the emergent therapies. Supplementary Information The online version contains supplementary material available at 10.1186/s13023-022-02340-7.
Collapse
Affiliation(s)
- Aymane Bouzidi
- Equipe MitoLab, Unité MitoVasc, INSERM U1083, CHU d'Angers, CNRS 6015, Université d'Angers, 49933, Angers, France.,Genomics and Human Genetics Laboratory, Institut Pasteur du Maroc, Casablanca, Morocco.,Team of Anthropogenetics and Biotechnologies, Faculty of Sciences, Chouaïb Doukkali University, Eljadida, Morocco
| | - Hicham Charoute
- Research Unit of Epidemiology, Biostatistics and Bioinformatics, Institut Pasteur du Maroc, Casablanca, Morocco
| | - Majida Charif
- Genetics, and Immuno-Cell Therapy Team, Mohamed First University, Oujda, Morocco
| | - Ghita Amalou
- Equipe MitoLab, Unité MitoVasc, INSERM U1083, CHU d'Angers, CNRS 6015, Université d'Angers, 49933, Angers, France.,Genomics and Human Genetics Laboratory, Institut Pasteur du Maroc, Casablanca, Morocco.,Team of Anthropogenetics and Biotechnologies, Faculty of Sciences, Chouaïb Doukkali University, Eljadida, Morocco
| | - Mostafa Kandil
- Team of Anthropogenetics and Biotechnologies, Faculty of Sciences, Chouaïb Doukkali University, Eljadida, Morocco
| | - Abdelhamid Barakat
- Genomics and Human Genetics Laboratory, Institut Pasteur du Maroc, Casablanca, Morocco
| | - Guy Lenaers
- Equipe MitoLab, Unité MitoVasc, INSERM U1083, CHU d'Angers, CNRS 6015, Université d'Angers, 49933, Angers, France. .,Service de Neurologie, CHU d'Angers, Angers, France.
| |
Collapse
|
9
|
Daich Varela M, Michaelides M. RDH12 retinopathy: clinical features, biology, genetics and future directions. Ophthalmic Genet 2022; 43:1-6. [PMID: 35491887 PMCID: PMC10479312 DOI: 10.1080/13816810.2022.2062392] [Citation(s) in RCA: 6] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/03/2022] [Revised: 03/14/2022] [Accepted: 03/22/2022] [Indexed: 10/18/2022]
Abstract
Retinol dehydrogenase 12 (RDH12) is a small gene located on chromosome 14, encoding an enzyme capable of metabolizing retinoids. It is primarily located in photoreceptor inner segments and thereby is believed to have an important role in clearing excessive retinal and other toxic aldehydes produced by light exposure. Clinical features: RDH12-associated retinopathy has wide phenotypic variability; including early-onset severe retinal dystrophy/Leber Congenital Amaurosis (EOSRD/LCA; most frequent presentation), retinitis pigmentosa, cone-rod dystrophy, and macular dystrophy. It can be inherited in an autosomal recessive and dominant fashion. RDH12-EOSRD/LCA's key features are early visual impairment, petal-shaped, coloboma-like macular atrophy with variegated watercolour-like pattern, peripapillary sparing, and often dense bone spicule pigmentation. Future directions: There is currently no treatment available for RDH12-retinopathy. However, extensive preclinical investigations and an ongoing prospective natural history study are preparing the necessary foundation to design and establish forthcoming clinical trials. Herein, we will concisely review pathophysiology, molecular genetics, clinical features, and discuss therapeutic approaches.
Collapse
Affiliation(s)
- Malena Daich Varela
- UCL Institute of Ophthalmology, University College London, London, UK
- Moorfields Eye Hospital, London, UK
| | - Michel Michaelides
- UCL Institute of Ophthalmology, University College London, London, UK
- Moorfields Eye Hospital, London, UK
| |
Collapse
|
10
|
Molina Romero M, Yoldi Chaure A, Gañán Parra M, Navas Bastida P, del Pico Sánchez JL, Vaquero Argüelles Á, de la Fuente Vaquero P, Ramírez López JP, Castilla Alcalá JA. Probability of high-risk genetic matching with oocyte and semen donors: complete gene analysis or genotyping test? J Assist Reprod Genet 2022; 39:341-355. [PMID: 35091964 PMCID: PMC8956772 DOI: 10.1007/s10815-021-02381-0] [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: 03/29/2021] [Accepted: 12/17/2021] [Indexed: 02/03/2023] Open
Abstract
PURPOSE To estimate the probability of high-risk genetic matching when assisted reproductive techniques (ART) are applied with double gamete donation, following an NGS carrier test based on a complete study of the genes concerned. We then determine the results that would have been obtained if the genotyping tests most widely used in Spanish gamete banks had been applied. METHODS In this descriptive observational study, 1818 gamete donors were characterised by NGS. The pathogenic variants detected were analysed to estimate the probability of high-risk genetic matching and to determine the results that would have been obtained if the three most commonly used genotyping tests in ART had been applied. RESULTS The probability of high-risk genetic matching with gamete donation, screened by NGS and complete gene analysis, was 5.5%, versus the 0.6-2.7% that would have been obtained with the genotyping test. A total of 1741 variants were detected, including 607 different variants, of which only 22.6% would have been detected by all three genotyping tests considered and 44.7% of which would not have been detected by any of these tests. CONCLUSION Our study highlights the considerable heterogeneity of the genotyping tests, which present significant differences in their ability to detect pathogenic variants. The complete study of the genes by NGS considerably reduces reproductive risks when genetic matching is performed with gamete donors. Accordingly, we recommend that carrier screening in gamete donors be carried out using NGS and a complete study with nontargeted analysis of the variants of the screened genes.
Collapse
Affiliation(s)
- Marta Molina Romero
- CEIFER Biobanco - NextClinics, Calle Maestro Bretón, 1, 18004 Granada, Spain
| | | | | | | | | | | | | | | | - José Antonio Castilla Alcalá
- CEIFER Biobanco - NextClinics, Calle Maestro Bretón, 1, 18004 Granada, Spain ,U. Reproducción, UGC Obstetricia y Ginecología, HU Virgen de Las Nieves, Granada, Spain ,Instituto de Investigación Biosanitaria Ibs.Granada, Granada, Spain
| |
Collapse
|
11
|
Rehman AU, Sepahi N, Bedoni N, Ravesh Z, Salmaninejad A, Cancellieri F, Peter VG, Quinodoz M, Mojarrad M, Pasdar A, Asad AG, Ghalamkari S, Piran M, Piran M, Superti-Furga A, Rivolta C. Whole exome sequencing in 17 consanguineous Iranian pedigrees expands the mutational spectrum of inherited retinal dystrophies. Sci Rep 2021; 11:19332. [PMID: 34588515 PMCID: PMC8481312 DOI: 10.1038/s41598-021-98677-3] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/22/2021] [Accepted: 09/06/2021] [Indexed: 11/24/2022] Open
Abstract
Inherited retinal dystrophies (IRDs) constitute one of the most heterogeneous groups of Mendelian human disorders. Using autozygome-guided next-generation sequencing methods in 17 consanguineous pedigrees of Iranian descent with isolated or syndromic IRD, we identified 17 distinct genomic variants in 11 previously-reported disease genes. Consistent with a recessive inheritance pattern, as suggested by pedigrees, variants discovered in our study were exclusively bi-allelic and mostly in a homozygous state (in 15 families out of 17, or 88%). Out of the 17 variants identified, 5 (29%) were never reported before. Interestingly, two mutations (GUCY2D:c.564dup, p.Ala189ArgfsTer130 and TULP1:c.1199G > A, p.Arg400Gln) were also identified in four separate pedigrees (two pedigrees each). In addition to expanding the mutational spectrum of IRDs, our findings confirm that the traditional practice of endogamy in the Iranian population is a prime cause for the appearance of IRDs.
Collapse
Affiliation(s)
- Atta Ur Rehman
- Division of Genetic Medicine, Lausanne University Hospital and University of Lausanne, Lausanne, Switzerland
| | - Neda Sepahi
- Noncommunicable Diseases Research Center, Fasa University of Medical Sciences, Fasa, Iran
| | - Nicola Bedoni
- Division of Genetic Medicine, Lausanne University Hospital and University of Lausanne, Lausanne, Switzerland
| | - Zeinab Ravesh
- Department of Genetics and Genome Biology, University of Leicester, Leicester, UK
| | - Arash Salmaninejad
- Department of Medical Genetics and Molecular Medicine, Faculty of Medicine, Mashhad University of Medical Sciences, Mashhad, Iran
| | - Francesca Cancellieri
- Institute of Molecular and Clinical Ophthalmology Basel (IOB), Basel, Switzerland.,Department of Ophthalmology, University of Basel, Basel, Switzerland
| | - Virginie G Peter
- Department of Genetics and Genome Biology, University of Leicester, Leicester, UK.,Institute of Molecular and Clinical Ophthalmology Basel (IOB), Basel, Switzerland.,Department of Ophthalmology, University of Basel, Basel, Switzerland.,Institute of Experimental Pathology, Lausanne University Hospital, University of Lausanne, Lausanne, Switzerland
| | - Mathieu Quinodoz
- Department of Genetics and Genome Biology, University of Leicester, Leicester, UK.,Institute of Molecular and Clinical Ophthalmology Basel (IOB), Basel, Switzerland.,Department of Ophthalmology, University of Basel, Basel, Switzerland
| | - Majid Mojarrad
- Department of Medical Genetics and Molecular Medicine, Faculty of Medicine, Mashhad University of Medical Sciences, Mashhad, Iran
| | - Alireza Pasdar
- Department of Medical Genetics and Molecular Medicine, Faculty of Medicine, Mashhad University of Medical Sciences, Mashhad, Iran.,Medical Genetics Research Centre, Faculty of Medicine, Mashhad University of Medical Sciences, Mashhad, Iran.,Division of Applied Medicine, Medical School, University of Aberdeen, Aberdeen, UK
| | - Ali Ghanbari Asad
- Noncommunicable Diseases Research Center, Fasa University of Medical Sciences, Fasa, Iran
| | | | - Mehran Piran
- Noncommunicable Diseases Research Center, Fasa University of Medical Sciences, Fasa, Iran
| | - Mehrdad Piran
- Noncommunicable Diseases Research Center, Fasa University of Medical Sciences, Fasa, Iran
| | - Andrea Superti-Furga
- Division of Genetic Medicine, Lausanne University Hospital and University of Lausanne, Lausanne, Switzerland
| | - Carlo Rivolta
- Department of Genetics and Genome Biology, University of Leicester, Leicester, UK. .,Institute of Molecular and Clinical Ophthalmology Basel (IOB), Basel, Switzerland. .,Department of Ophthalmology, University of Basel, Basel, Switzerland.
| |
Collapse
|
12
|
Sarkar H, Toms M, Moosajee M. Involvement of Oxidative and Endoplasmic Reticulum Stress in RDH12-Related Retinopathies. Int J Mol Sci 2021; 22:ijms22168863. [PMID: 34445569 PMCID: PMC8396253 DOI: 10.3390/ijms22168863] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/20/2021] [Revised: 08/12/2021] [Accepted: 08/15/2021] [Indexed: 12/16/2022] Open
Abstract
Retinol dehydrogenase 12 (RDH12) is expressed in photoreceptor inner segments and catalyses the reduction of all-trans retinal (atRAL) to all-trans retinol (atROL), as part of the visual cycle. Mutations in RDH12 are primarily associated with autosomal recessive Leber congenital amaurosis. To further our understanding of the disease mechanisms, HEK-293 cell lines expressing wildtype (WT) and mutant RDH12 were created. The WT cells afforded protection from atRAL-induced toxicity and oxidative stress. Mutant RDH12 cells displayed reduced protein expression and activity, with an inability to protect cells from atRAL toxicity, inducing oxidative and endoplasmic reticulum (ER) stress, with upregulation of sXBP1, CHOP, and ATF4. Pregabalin, a retinal scavenger, attenuated atRAL-induced ER stress in the mutant RDH12 cell lines. A zebrafish rdh12 mutant model (rdh12u533 c.17_23del; p.(Val6AlafsTer5)) was generated through CRISPR-Cas9 gene editing. Mutant fish showed disrupted phagocytosis through transmission electron microscopy, with increased phagosome size at 12 months post-fertilisation. Rhodopsin mislocalisation and reduced expression of atg12 and sod2 indicated early signs of a rod-predominant degeneration. A lack of functional RDH12 results in ER and oxidative stress representing key pathways to be targeted for potential therapeutics.
Collapse
Affiliation(s)
- Hajrah Sarkar
- Institute of Ophthalmology, University College London, London EC1V 9EL, UK; (H.S.); (M.T.)
- The Francis Crick Institute, London NW1 1AT, UK
| | - Maria Toms
- Institute of Ophthalmology, University College London, London EC1V 9EL, UK; (H.S.); (M.T.)
- The Francis Crick Institute, London NW1 1AT, UK
| | - Mariya Moosajee
- Institute of Ophthalmology, University College London, London EC1V 9EL, UK; (H.S.); (M.T.)
- The Francis Crick Institute, London NW1 1AT, UK
- Moorfields Eye Hospital NHS Foundation Trust, London EC1V 2PD, UK
- Great Ormond Street Hospital for Children NHS Foundation Trust, London WC1N 3JH, UK
- Correspondence:
| |
Collapse
|
13
|
Duzkale N, Arslan U. Investigation of genotype-phenotype relationship in Turkish patients with inherited retinal disease by next generation sequencing. Ophthalmic Genet 2021; 42:674-684. [PMID: 34315337 DOI: 10.1080/13816810.2021.1952616] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
Abstract
BACKGROUND Inherited retinal dystrophies (IRDs) are a group of retinal diseases genetically and clinically highly heterogeneous and associated with more than 300 genes. This study aims to investigate the genetic basis of Turkish patients with IRDs. MATERIALS AND METHODS In the study, genes related to retinal diseases in 86 IRDs patients were analyzed using the Next Generations Sequencing method (NGS). RESULTS The mean age of 86 patients was 35 and the mean age at diagnosis was 18. There was consanguinity between the parents of 62% of these patients. Fifty-six retinal disease-associated genes of 46 patients and 230 retinal disease-associated genes of 40 patients were examined. Genetic analysis provides a molecular diagnosis in a total of 53 (61.6%) patients. The genes responsible for the IRDs phenotype were frequently identified as ABCA4 (25%), EYS (11%), and RDH12 (9%). There was no significant difference between those with and without a molecular diagnosis in terms of demographic characteristics and family history. CONCLUSIONS Determination of genetic cause by NGS method in IRDs subgroups that are difficult to define by ophthalmic examination ensures that patients receive accurate diagnosis, treatment and counseling. This study contributed to the understanding of the genotype-phenotype relationship of Turkish patients with IRDs.
Collapse
Affiliation(s)
- Neslihan Duzkale
- Department of Medical Genetic, Diskapi Yildirim Beyazit Training and Research Hospital, Ankara, Turkey
| | - Umut Arslan
- Department of Bioretina, Ankara University Technopolis, Ankara, Turkey
| |
Collapse
|
14
|
De Zaeytijd J, Van Cauwenbergh C, De Bruyne M, Van Heetvelde M, De Baere E, Coppieters F, Leroy BP. ISOLATED MACULOPATHY AND MODERATE ROD-CONE DYSTROPHY REPRESENT THE MILDER END OF THE RDH12-RELATED RETINAL DYSTROPHY SPECTRUM. Retina 2021; 41:1346-1355. [PMID: 34001834 DOI: 10.1097/iae.0000000000003028] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
Abstract
PURPOSE To describe an isolated maculopathy and an intermediate rod-cone dystrophy phenotype as the milder end of the RDH12-related retinal dystrophy spectrum. METHODS Seven patients (17-34 years of age) underwent an extensive ophthalmic workup including psychophysical and electrophysiological testing and multimodal imaging. RESULTS Three patients have isolated macular disease. Best-corrected visual acuity (BCVA) ranges from 20/125 to 20/40 with normal visual fields or only limited central, relative scotomata, and normal full-field ERGs. Both optical coherence tomography scans and autofluorescent imaging hint at relatively better-preserved foveal quality initially. An intermediate rod-cone phenotype in four patients is characterized by a central retinal dystrophy extending just beyond the vascular arcades, characteristic peripapillary sparing, and additional scattered atrophic patches. Again, foveal quality is initially better on optical coherence tomography scans. Best-corrected visual acuity ranges from counting fingers to 20/32. Goldmann visual fields vary from central scotomata to severe generalized abnormalities. ERGs range between mild and severe rod-cone dysfunction. Nine distinct RDH12 pathogenic variants, two of which are novel, are identified. CONCLUSION The classic phenotype of RDH12-related early-onset retinal dystrophy is expanded to include an isolated maculopathy and intermediate dystrophy phenotype, characterized by its later onset and milder course with a fair visual potential until much later in life, emphasizing the phenotypic heterogeneity of RDH12-related retinopathy.
Collapse
Affiliation(s)
- Julie De Zaeytijd
- Department of Ophthalmology, Ghent University Hospital, Ghent, Belgium
| | - Caroline Van Cauwenbergh
- Department of Ophthalmology, Ghent University Hospital, Ghent, Belgium
- Department of Head & Skin, Ghent University, Ghent, Belgium
- Center for Medical Genetics Ghent, Ghent University Hospital, Ghent, Belgium
| | - Marieke De Bruyne
- Center for Medical Genetics Ghent, Ghent University Hospital, Ghent, Belgium
- Department of Biomolecular Medicine, Ghent University, Ghent, Belgium
| | - Mattias Van Heetvelde
- Center for Medical Genetics Ghent, Ghent University Hospital, Ghent, Belgium
- Department of Biomolecular Medicine, Ghent University, Ghent, Belgium
| | - Elfride De Baere
- Center for Medical Genetics Ghent, Ghent University Hospital, Ghent, Belgium
- Department of Biomolecular Medicine, Ghent University, Ghent, Belgium
| | - Frauke Coppieters
- Center for Medical Genetics Ghent, Ghent University Hospital, Ghent, Belgium
- Department of Biomolecular Medicine, Ghent University, Ghent, Belgium
| | - Bart P Leroy
- Department of Ophthalmology, Ghent University Hospital, Ghent, Belgium
- Department of Head & Skin, Ghent University, Ghent, Belgium
- Center for Medical Genetics Ghent, Ghent University Hospital, Ghent, Belgium
- Division of Ophthalmology, The Children's Hospital of Philadelphia, Philadelphia, Pennsylvania; and
- Center for Cellular and Molecular Therapeutics, The Children's Hospital of Philadelphia, Philadelphia, Pennsylvania
| |
Collapse
|
15
|
Muthiah MN, Kalitzeos A, Oprych K, Singh N, Georgiou M, Wright GA, Robson AG, Arno G, Khan K, Michaelides M. Novel disease-causing variant in RDH12 presenting with autosomal dominant retinitis pigmentosa. Br J Ophthalmol 2021; 106:1274-1281. [PMID: 34031043 PMCID: PMC9411907 DOI: 10.1136/bjophthalmol-2020-318034] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/29/2020] [Revised: 03/06/2021] [Accepted: 03/23/2021] [Indexed: 12/02/2022]
Abstract
Aim To describe the clinical and molecular features of a novel, autosomal dominant RDH12-retinopathy. Methods Retrospective cross-sectional study. Twelve individuals from a four-generation British pedigree underwent ophthalmic examination, genotyping using next generation sequencing, including whole genome sequencing and multimodal retinal imaging including fundus photography, optical coherence tomography (OCT), autofluorescence imaging and adaptive optics (AO) scanning light ophthalmoscopy were performed. Visual electrophysiology was performed in a subset. Results Eight family members were confirmed as affected by genotyping heterozygous for RDH12 c.763delG. Visual acuity ranged from −0.1 to 0.2 logMAR. Affected individuals had constricted visual fields. A parafoveal and peripapillary ring of hyper-autofluorescence was seen initially, and with progression the area of perifoveal hypo-autofluorescence increased to involve the parafoveal area. Mild retinal thinning was identified on OCT imaging with reduction in both foveal total retinal and outer nuclear layer thickness. Cone densities along the temporal meridian were reduced in affected individuals compared with normative values at all temporal eccentricities studied. One individual with incomplete penetrance, was identified as clinically affected primarily on the basis of AO imaging. Full-field electroretinography demonstrated a rod-cone pattern of dysfunction and large-field pattern electroretinography identified peripheral macular dysfunction. Conclusions This novel heterozygous variant RDH12 c.763delG is associated with a rod-cone dystrophy with variable expression. Determination of the degree of penetrance may depend on the modality employed to phenotypically characterise an individual. This rare and specific heterozygous (dominant) variant is predicted to result in a gain of function, that causes disease in a gene typically associated with biallelic (recessive) variants.
Collapse
Affiliation(s)
- Manickam Nick Muthiah
- Cell and Gene Therapy, University College London Institute of Ophthalmology, London, UK .,Vitreoretinal Research, Moorfields Eye Hospital NHS Foundation Trust, London, UK
| | - Angelos Kalitzeos
- Cell and Gene Therapy, University College London Institute of Ophthalmology, London, UK.,Moorfields Eye Hospital NHS Foundation Trust, London, UK
| | - Kate Oprych
- Great Ormond Street Hospital For Children NHS Trust, London, UK
| | - Navjit Singh
- Cell and Gene Therapy, University College London Institute of Ophthalmology, London, UK.,Moorfields Eye Hospital NHS Foundation Trust, London, UK
| | - Michalis Georgiou
- Cell and Gene Therapy, University College London Institute of Ophthalmology, London, UK.,Moorfields Eye Hospital NHS Foundation Trust, London, UK
| | - Genevieve Ann Wright
- National Institute for Health Research Biomedical Research Centre at Moorfields Eye Hospital NHS Foundation Trust and UCL Institute of Ophthalmology, London, Greater London, UK
| | - Anthony G Robson
- National Institute for Health Research Biomedical Research Centre at Moorfields Eye Hospital NHS Foundation Trust and UCL Institute of Ophthalmology, London, Greater London, UK.,Electrophysiology, Moorfields Eye Hospital NHS Foundation Trust, London, UK
| | - Gavin Arno
- Cell and Gene Therapy, University College London Institute of Ophthalmology, London, UK.,Great Ormond Street Hospital For Children NHS Trust, London, UK
| | - Kamron Khan
- Department of Ophthalmology, Leeds Teaching Hospitals NHS Trust, Leeds, UK.,Department of Ophthalmology, Calderdale and Huddersfield NHS Foundation Trust, Huddersfield, West Yorkshire, UK
| | - Michel Michaelides
- Cell and Gene Therapy, University College London Institute of Ophthalmology, London, UK .,Moorfields Eye Hospital NHS Foundation Trust, London, UK
| |
Collapse
|
16
|
Unique Variant Spectrum in a Jordanian Cohort with Inherited Retinal Dystrophies. Genes (Basel) 2021; 12:genes12040593. [PMID: 33921607 PMCID: PMC8074154 DOI: 10.3390/genes12040593] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/20/2021] [Revised: 04/07/2021] [Accepted: 04/14/2021] [Indexed: 12/12/2022] Open
Abstract
Whole Exome Sequencing (WES) is a powerful approach for detecting sequence variations in the human genome. The aim of this study was to investigate the genetic defects in Jordanian patients with inherited retinal dystrophies (IRDs) using WES. WES was performed on proband patients' DNA samples from 55 Jordanian families. Sanger sequencing was used for validation and segregation analysis of the detected, potential disease-causing variants (DCVs). Thirty-five putatively causative variants (6 novel and 29 known) in 21 IRD-associated genes were identified in 71% of probands (39 of the 55 families). Three families showed phenotypes different from the typically reported clinical findings associated with the causative genes. To our knowledge, this is the largest genetic analysis of IRDs in the Jordanian population to date. Our study also confirms that WES is a powerful tool for the molecular diagnosis of IRDs in large patient cohorts.
Collapse
|
17
|
Ma DJ, Lee HS, Kim K, Choi S, Jang I, Cho SH, Yoon CK, Lee EK, Yu HG. Whole-exome sequencing in 168 Korean patients with inherited retinal degeneration. BMC Med Genomics 2021; 14:74. [PMID: 33691693 PMCID: PMC7945660 DOI: 10.1186/s12920-021-00874-6] [Citation(s) in RCA: 23] [Impact Index Per Article: 7.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/15/2020] [Accepted: 01/13/2021] [Indexed: 11/16/2022] Open
Abstract
BACKGROUND To date, no genetic analysis of inherited retinal disease (IRD) using whole-exome sequencing (WES) has been conducted in a large-scale Korean cohort. The aim of this study was to characterise the genetic profile of IRD patients in Korea using WES. METHODS We performed comprehensive molecular testing in 168 unrelated Korean IRD patients using WES. The potential pathogenicity of candidate variants was assessed using the American College of Medical Genetics and Genomics and the Association for Molecular Pathology variant interpretation guidelines, in silico prediction tools, published literature, and compatibility with known phenotypes or inheritance patterns. RESULTS Causative variants were detected in 86/168 (51.2%) IRD patients, including 58/107 (54.2%) with retinitis pigmentosa, 7/15 (46.7%) with cone and cone-rod dystrophy, 2/3 (66.6%) with Usher syndrome, 1/2 (50.0%) with congenital stationary night blindness, 2/2 (100.0%) with Leber congenital amaurosis, 1/1 (100.0%) with Bietti crystalline dystrophy, 1/1 (100.0%) with Joubert syndrome, 9/10 (90.0%) with Stargardt macular dystrophy, 1/10 (10.0%) with vitelliform macular dystrophy, 1/11 (9.1%) with other forms of macular dystrophy, and 3/4 (75.0%) with choroideraemia. USH2A, ABCA4, and EYS were the most common causative genes associated with IRD. For retinitis pigmentosa, variants of USH2A and EYS were the most common causative gene mutations. CONCLUSIONS This study demonstrated the distribution of causative genetic mutations in Korean IRD patients. The data will serve as a reference for future genetic screening and development of treatment modalities for Korean IRD patients.
Collapse
Affiliation(s)
- Dae Joong Ma
- Retinal Degeneration Research Lab, Biomedical Research Institute, Seoul National University Hospital, Seoul, Republic of Korea
- Department of Ophthalmology, Hallym University Kangnam Sacred Heart Hospital, Seoul, Republic of Korea
| | - Hyun-Seob Lee
- Genomics Core Facility, Translational Research Institute, Biomedical Research Institute, Seoul National University Hospital, Seoul, Republic of Korea
| | - Kwangsoo Kim
- Transdisciplinary Department of Medicine and Advanced Technology, Seoul National University Hospital, Seoul, Republic of Korea
| | - Seongmin Choi
- Biomedical Research Institute, Seoul National University Hospital, Seoul, Republic of Korea
| | - Insoon Jang
- Biomedical Research Institute, Seoul National University Hospital, Seoul, Republic of Korea
| | - Seo-Ho Cho
- Biomedical Research Institute, Seoul National University Hospital, Seoul, Republic of Korea
| | - Chang Ki Yoon
- Retinal Degeneration Research Lab, Biomedical Research Institute, Seoul National University Hospital, Seoul, Republic of Korea
- Department of Ophthalmology, College of Medicine, Seoul National University, Seoul, Republic of Korea
| | - Eun Kyoung Lee
- Retinal Degeneration Research Lab, Biomedical Research Institute, Seoul National University Hospital, Seoul, Republic of Korea
- Department of Ophthalmology, College of Medicine, Seoul National University, Seoul, Republic of Korea
| | - Hyeong Gon Yu
- Retinal Degeneration Research Lab, Biomedical Research Institute, Seoul National University Hospital, Seoul, Republic of Korea.
- Department of Ophthalmology, College of Medicine, Seoul National University, Seoul, Republic of Korea.
| |
Collapse
|
18
|
Gao J, Xu G, Xu P. Comparative transcriptome analysis reveals metabolism transformation in Coilia nasus larvae during the mouth-open period. COMPARATIVE BIOCHEMISTRY AND PHYSIOLOGY D-GENOMICS & PROTEOMICS 2020; 36:100712. [DOI: 10.1016/j.cbd.2020.100712] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/24/2020] [Revised: 07/07/2020] [Accepted: 07/08/2020] [Indexed: 01/23/2023]
|
19
|
Abstract
PURPOSE To characterize the phenotypic variability and report the genetic defects in a cohort of Chinese patients with biallelic variants of the retinol dehydrogenase 12 (RDH12) gene. METHODS The study included 38 patients from 38 unrelated families with biallelic pathogenic RDH12 variants. Systematic next-generation sequencing data analysis, Sanger sequencing validation, and segregation analysis were used to identify the pathogenic mutations. Detailed ophthalmic examinations, including electroretinogram, fundus photography, fundus autofluorescence and optical coherence tomography, and statistical analysis were performed to evaluate phenotype variability. RESULTS Twenty-five different mutations of RDH12 were identified in the 38 families. Six of these variants were novel. Val146Asp was observed at the highest frequency (23.7%), and it was followed by Arg62Ter (14.5%) and Thr49Met (9.2%). Twenty-three probands were diagnosed with early-onset severe retinal dystrophy, 6 with Leber congenital amaurosis, 7 with autosomal recessive retinitis pigmentosa, and 2 with cone-rod dystrophy. Self-reported nyctalopia occurred in about a half of patients (55.3%) and was significantly more common among older patients (P < 0.01). Nyctalopia was not significantly associated with best-corrected visual acuity (P = 0.72), but older patients had significantly greater best-corrected visual acuity loss (P < 0.01). Only 15.8% of the patients had nystagmus, which was significantly more likely to occur among 36.8% of the patients with hyperopia >3D (P < 0.01) and/or in cases of reduced best-corrected visual acuity (P = 0.01), but was not associated with age (P = 0.87). CONCLUSION Several high-frequency RDH12 variants were identified in patients with inherited retinal dystrophies, most of which were missense mutations. Variable but characteristic phenotypes of a progressive nature was observed. Overall, the findings indicated that biallelic RDH12 mutations are a common cause of early-onset retinal dystrophy and a rare cause of cone-rod dystrophy.
Collapse
|
20
|
Ba-Abbad R, Arno G, Robson AG, Bouras K, Georgiou M, Wright G, Webster AR, Michaelides M. Macula-predominant retinopathy associated with biallelic variants in RDH12. Ophthalmic Genet 2020; 41:612-615. [PMID: 32790509 DOI: 10.1080/13816810.2020.1802763] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
Abstract
PURPOSE To describe the clinical, electrophysiological, and molecular features of an unusual macula-predominant retinopathy in two unrelated probands with biallelic variants in RDH12. METHODS Retrospective case series. RESULTS A 29-year-old female presented with visual loss since the age of 14 years. Retinal examination revealed symmetric outer retinal atrophy in the posterior pole with peripapillary sparing. Fundus autofluorescence (AF) showed patchy loss of AF in the posterior pole, with hyper-autofluorescent borders. Optical coherence tomography (OCT) showed loss of the macular outer retinal layers. Pattern electroretinography (PERG) showed macular dysfunction and full-field ERG indicated mild loss of photoreceptor function. Next-generation sequencing (NGS) identified two variants in RDH12: p.(Arg234His) and c.448 + 1 G > A in trans. The second patient was a 10-year-old male with bilateral macular changes and visual loss. Retinal examination showed bilateral macular cloverleaf-like outer retinal changes, with relative foveal sparing. Fundus AF showed bilateral macular hypo-autofluorescent patches with a border of increased signal and preserved foveal AF. OCT showed attenuation of the perifoveal outer retinal layers in the regions of reduced AF signal. PERG showed macular dysfunction, but the full-field ERG was normal. NGS and whole-genome sequencing identified two variants in RDH12: p.(Arg234His) and p.(Cys245_Leu247deI) in trans. CONCLUSIONS Disease-causing variants in RDH12 are typically associated with early-onset severe retinal dystrophy with significant macular involvement. Hypomorphic alleles of this gene cause relatively mild retinopathy with predominant macular involvement. This phenotype demonstrates the vulnerability of the macular photoreceptors to certain perturbations of RDH12.
Collapse
Affiliation(s)
- Rola Ba-Abbad
- UCL Institute of Ophthalmology, University College London , London, UK.,Genetics Department, Moorfields Eye Hospital , London, UK.,Vitreoretinal Division, King Khaled Eye Specialist Hospital , Riyadh, Saudi Arabia
| | - Gavin Arno
- UCL Institute of Ophthalmology, University College London , London, UK.,Genetics Department, Moorfields Eye Hospital , London, UK
| | - Anthony G Robson
- UCL Institute of Ophthalmology, University College London , London, UK.,Genetics Department, Moorfields Eye Hospital , London, UK
| | | | - Michalis Georgiou
- UCL Institute of Ophthalmology, University College London , London, UK.,Genetics Department, Moorfields Eye Hospital , London, UK
| | - Genevieve Wright
- UCL Institute of Ophthalmology, University College London , London, UK
| | - Andrew R Webster
- UCL Institute of Ophthalmology, University College London , London, UK.,Genetics Department, Moorfields Eye Hospital , London, UK
| | - Michel Michaelides
- UCL Institute of Ophthalmology, University College London , London, UK.,Genetics Department, Moorfields Eye Hospital , London, UK
| |
Collapse
|
21
|
Ernst DA, Fitak RR, Schmidt M, Derby CD, Johnsen S, Lohmann KJ. Pulse magnetization elicits differential gene expression in the central nervous system of the Caribbean spiny lobster, Panulirus argus. J Comp Physiol A Neuroethol Sens Neural Behav Physiol 2020; 206:725-742. [PMID: 32607762 DOI: 10.1007/s00359-020-01433-7] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/17/2019] [Revised: 05/18/2020] [Accepted: 06/15/2020] [Indexed: 12/12/2022]
Abstract
Diverse animals use Earth's magnetic field to guide their movements, but the neural and molecular mechanisms underlying the magnetic sense remain enigmatic. One hypothesis is that particles of the mineral magnetite (Fe3O4) provide the basis of magnetoreception. Here we examined gene expression in the central nervous system of a magnetically sensitive invertebrate, the Caribbean spiny lobster (Panulirus argus), after applying a magnetic pulse known to alter magnetic orientation behavior. Numerous genes were differentially expressed in response to the pulse, including 647 in the brain, 1256 in the subesophageal ganglion, and 712 in the thoracic ganglia. Many such genes encode proteins linked to iron regulation, oxidative stress, and immune response, consistent with possible impacts of a magnetic pulse on magnetite-based magnetoreceptors. Additionally, however, altered expression also occurred for numerous genes with no apparent link to magnetoreception, including genes encoding proteins linked to photoreception, carbohydrate and hormone metabolism, and other physiological processes. Overall, the results are consistent with the magnetite hypothesis of magnetoreception, yet also reveal that in spiny lobsters, a strong pulse altered expression of > 10% of all expressed genes, including many seemingly unrelated to sensory processes. Thus, caution is required when interpreting the effects of magnetic pulses on animal behavior.
Collapse
Affiliation(s)
- David A Ernst
- Department of Biology, University of North Carolina, Chapel Hill, NC, 27599, USA. .,Department of Biological Sciences, University of Arkansas, Fayetteville, AR, 72701, USA.
| | - Robert R Fitak
- Genomics and Bioinformatics Cluster, Department of Biology, University of Central Florida, Orlando, FL, 32816, USA
| | - Manfred Schmidt
- Neuroscience Institute and Department of Biology, Georgia State University, Atlanta, GA, 30303, USA
| | - Charles D Derby
- Neuroscience Institute and Department of Biology, Georgia State University, Atlanta, GA, 30303, USA
| | - Sönke Johnsen
- Department of Biology, Duke University, Durham, NC, 27708, USA
| | - Kenneth J Lohmann
- Department of Biology, University of North Carolina, Chapel Hill, NC, 27599, USA
| |
Collapse
|
22
|
Cherry TJ, Yang MG, Harmin DA, Tao P, Timms AE, Bauwens M, Allikmets R, Jones EM, Chen R, De Baere E, Greenberg ME. Mapping the cis-regulatory architecture of the human retina reveals noncoding genetic variation in disease. Proc Natl Acad Sci U S A 2020; 117:9001-9012. [PMID: 32265282 PMCID: PMC7183164 DOI: 10.1073/pnas.1922501117] [Citation(s) in RCA: 57] [Impact Index Per Article: 14.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022] Open
Abstract
The interplay of transcription factors and cis-regulatory elements (CREs) orchestrates the dynamic and diverse genetic programs that assemble the human central nervous system (CNS) during development and maintain its function throughout life. Genetic variation within CREs plays a central role in phenotypic variation in complex traits including the risk of developing disease. We took advantage of the retina, a well-characterized region of the CNS known to be affected by pathogenic variants in CREs, to establish a roadmap for characterizing regulatory variation in the human CNS. This comprehensive analysis of tissue-specific regulatory elements, transcription factor binding, and gene expression programs in three regions of the human visual system (retina, macula, and retinal pigment epithelium/choroid) reveals features of regulatory element evolution that shape tissue-specific gene expression programs and defines regulatory elements with the potential to contribute to Mendelian and complex disorders of human vision.
Collapse
Affiliation(s)
- Timothy J Cherry
- Department of Pediatrics, University of Washington School of Medicine, Seattle, WA 98101;
- Department of Ophthalmology, University of Washington School of Medicine, Seattle, WA 98101
- Department of Biological Structure, University of Washington School of Medicine, Seattle, WA 98101
- Center for Developmental Biology and Regenerative Medicine, Seattle Children's Research Institute, Seattle, WA 98101
| | - Marty G Yang
- Department of Neurobiology, Harvard Medical School, Boston, MA 02115
- Program in Neuroscience, Harvard Medical School, Boston, MA 02115
| | - David A Harmin
- Department of Neurobiology, Harvard Medical School, Boston, MA 02115
| | - Peter Tao
- Department of Neurobiology, Harvard Medical School, Boston, MA 02115
| | - Andrew E Timms
- Center for Developmental Biology and Regenerative Medicine, Seattle Children's Research Institute, Seattle, WA 98101
| | - Miriam Bauwens
- Center for Medical Genetics, Ghent University and Ghent University Hospital, 9000 Ghent, Belgium
| | - Rando Allikmets
- Department of Ophthalmology, Columbia University, New York, NY 10032
- Department of Pathology and Cell Biology, Columbia University, New York, NY 10032
| | - Evan M Jones
- Human Genome Sequencing Center, Baylor College of Medicine, Houston, TX 77030-3411
- Department of Molecular and Human Genetics, Baylor College of Medicine, Houston, TX 77030-3411
| | - Rui Chen
- Human Genome Sequencing Center, Baylor College of Medicine, Houston, TX 77030-3411
- Department of Molecular and Human Genetics, Baylor College of Medicine, Houston, TX 77030-3411
| | - Elfride De Baere
- Center for Medical Genetics, Ghent University and Ghent University Hospital, 9000 Ghent, Belgium
| | | |
Collapse
|
23
|
Natural History and Genotype-Phenotype Correlations in RDH12-Associated Retinal Degeneration. ADVANCES IN EXPERIMENTAL MEDICINE AND BIOLOGY 2020. [PMID: 31884613 DOI: 10.1007/978-3-030-27378-1_34] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 09/17/2023]
Abstract
Mutations in retinol dehydrogenase 12 (RDH12) cause a severe early-onset retinal degeneration, for which there is no treatment. RDH12 is involved in photoreceptor retinoid metabolism and is a potential target for gene therapy, which has been successful in treating RPE65-associated LCA. RDH12-associated retinal degeneration is particularly devastating due to early macular atrophy, which will likely impact therapeutic outcomes. Defining the unique features and natural history of disease associated with RDH12 mutations is a critical first step in developing treatments. The purpose of this review is to aggregate and summarize the body of literature on phenotypes in RDH12-associated retinal degeneration to help map the natural history of disease and identify phenotypic milestones in disease progression. The results reveal a severe blinding disorder with onset in early childhood and frequent retention of reduced yet useful vision until adolescence. The severity is associated with genotype in some cases. Distinct phenotypic features include macular atrophy followed by bone spicule pigment early in life, in contrast to other forms of LCA which often have a relatively normal fundus appearance in childhood despite severe visual dysfunction. Formal natural history studies are needed to define milestones in disease progression and identify appropriate outcome measures for future therapy trials.
Collapse
|
24
|
Scott HA, Place EM, Ferenchak K, Zampaglione E, Wagner NE, Chao KR, DiTroia SP, Navarro-Gomez D, Mukai S, Huckfeldt RM, Pierce EA, Bujakowska KM. Expanding the phenotypic spectrum in RDH12-associated retinal disease. Cold Spring Harb Mol Case Stud 2020; 6:mcs.a004754. [PMID: 32014858 PMCID: PMC6996522 DOI: 10.1101/mcs.a004754] [Citation(s) in RCA: 18] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/11/2019] [Accepted: 12/05/2019] [Indexed: 11/25/2022] Open
Abstract
Retinol dehydrogenase 12, RDH12, plays a pivotal role in the visual cycle to ensure the maintenance of normal vision. Alterations in activity of this protein result in photoreceptor death and decreased vision beginning at an early age and progressing to substantial vision loss later in life. Here we describe 11 patients with retinal degeneration that underwent next-generation sequencing (NGS) with a targeted panel of all currently known inherited retinal degeneration (IRD) genes and whole-exome sequencing to identify the genetic causality of their retinal disease. These patients display a range of phenotypic severity prompting clinical diagnoses of macular dystrophy, cone-rod dystrophy, retinitis pigmentosa, and early-onset severe retinal dystrophy all attributed to biallelic recessive mutations in RDH12. We report 15 causal alleles and expand the repertoire of known RDH12 mutations with four novel variants: c.215A > G (p.Asp72Gly); c.362T > C (p.Ile121Thr); c.440A > C (p.Asn147Thr); and c.697G > A (p.Val233Ille). The broad phenotypic spectrum observed with biallelic RDH12 mutations has been observed in other genetic forms of IRDs, but the diversity is particularly notable here given the prior association of RDH12 primarily with severe early-onset disease. This breadth emphasizes the importance of broad genetic testing for inherited retinal disorders and extends the pool of individuals who may benefit from imminent gene-targeted therapies.
Collapse
Affiliation(s)
- Hilary A Scott
- Ocular Genomics Institute, Department of Ophthalmology, Massachusetts Eye and Ear, Harvard Medical School, Boston, Massachusetts 02114, USA
| | - Emily M Place
- Ocular Genomics Institute, Department of Ophthalmology, Massachusetts Eye and Ear, Harvard Medical School, Boston, Massachusetts 02114, USA
| | - Kevin Ferenchak
- Ocular Genomics Institute, Department of Ophthalmology, Massachusetts Eye and Ear, Harvard Medical School, Boston, Massachusetts 02114, USA
| | - Erin Zampaglione
- Ocular Genomics Institute, Department of Ophthalmology, Massachusetts Eye and Ear, Harvard Medical School, Boston, Massachusetts 02114, USA
| | - Naomi E Wagner
- Ocular Genomics Institute, Department of Ophthalmology, Massachusetts Eye and Ear, Harvard Medical School, Boston, Massachusetts 02114, USA
| | - Katherine R Chao
- Center for Mendelian Genetics, Broad Institute of MIT and Harvard, Cambridge, Massachusetts 02142, USA
| | - Stephanie P DiTroia
- Center for Mendelian Genetics, Broad Institute of MIT and Harvard, Cambridge, Massachusetts 02142, USA
| | - Daniel Navarro-Gomez
- Ocular Genomics Institute, Department of Ophthalmology, Massachusetts Eye and Ear, Harvard Medical School, Boston, Massachusetts 02114, USA
| | - Shizuo Mukai
- Retina Service, Department of Ophthalmology, Massachusetts Eye and Ear, Harvard Medical School, Boston, Massachusetts 02114, USA
| | - Rachel M Huckfeldt
- Ocular Genomics Institute, Department of Ophthalmology, Massachusetts Eye and Ear, Harvard Medical School, Boston, Massachusetts 02114, USA
| | - Eric A Pierce
- Ocular Genomics Institute, Department of Ophthalmology, Massachusetts Eye and Ear, Harvard Medical School, Boston, Massachusetts 02114, USA
| | - Kinga M Bujakowska
- Ocular Genomics Institute, Department of Ophthalmology, Massachusetts Eye and Ear, Harvard Medical School, Boston, Massachusetts 02114, USA
| |
Collapse
|
25
|
Sirbu IO, Chiş AR, Moise AR. Role of carotenoids and retinoids during heart development. Biochim Biophys Acta Mol Cell Biol Lipids 2020; 1865:158636. [PMID: 31978553 DOI: 10.1016/j.bbalip.2020.158636] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/03/2019] [Revised: 01/15/2020] [Accepted: 01/16/2020] [Indexed: 02/08/2023]
Abstract
The nutritional requirements of the developing embryo are complex. In the case of dietary vitamin A (retinol, retinyl esters and provitamin A carotenoids), maternal derived nutrients serve as precursors to signaling molecules such as retinoic acid, which is required for embryonic patterning and organogenesis. Despite variations in the composition and levels of maternal vitamin A, embryonic tissues need to generate a precise amount of retinoic acid to avoid congenital malformations. Here, we summarize recent findings regarding the role and metabolism of vitamin A during heart development and we survey the association of genes known to affect retinoid metabolism or signaling with various inherited disorders. A better understanding of the roles of vitamin A in the heart and of the factors that affect retinoid metabolism and signaling can help design strategies to meet nutritional needs and to prevent birth defects and disorders associated with altered retinoid metabolism. This article is part of a Special Issue entitled Carotenoids recent advances in cell and molecular biology edited by Johannes von Lintig and Loredana Quadro.
Collapse
Affiliation(s)
- Ioan Ovidiu Sirbu
- Biochemistry Department, Victor Babes University of Medicine and Pharmacy, Eftimie Murgu Nr. 2, 300041 Timisoara, Romania; Timisoara Institute of Complex Systems, V. Lucaciu 18, 300044 Timisoara, Romania.
| | - Aimée Rodica Chiş
- Biochemistry Department, Victor Babes University of Medicine and Pharmacy, Eftimie Murgu Nr. 2, 300041 Timisoara, Romania
| | - Alexander Radu Moise
- Medical Sciences Division, Northern Ontario School of Medicine, Sudbury, ON P3E 2C6, Canada; Department of Chemistry and Biochemistry, Biology and Biomolecular Sciences Program, Laurentian University, Sudbury, ON P3E 2C6, Canada.
| |
Collapse
|
26
|
Avela K, Salonen‐Kajander R, Laitinen A, Ramsden S, Barton S, Rudanko S. The genetic aetiology of retinal degeneration in children in Finland - new founder mutations identified. Acta Ophthalmol 2019; 97:805-814. [PMID: 31087526 DOI: 10.1111/aos.14128] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/18/2018] [Accepted: 04/10/2019] [Indexed: 01/22/2023]
Abstract
PURPOSE To study the genetic aetiology and phenotypes of retinal degeneration (RD) in Finnish children born during 1993-2009. METHODS Children with retinal degeneration (N = 68) were investigated during 2012-2014 with a targeted gene analysis or a next-generation sequencing (NGS) based gene panel. Also, a full clinical ophthalmological examination was performed. RESULTS The cohort covered 44% (68/153) of the Finnish children with inherited RD born 1993-2009. X-linked retinoschisis, retinitis pigmentosa, Leber congenital amaurosis and cone-rod dystrophy were the most common clinical diagnoses in the study group. Pathogenic mutations were found in 17 retinal genes. The molecular genetic aetiology was identified in 77% of the patients (in 77% of the families) analysed by NGS method. Several founder mutations were detected including three novel founder mutations c.148delG in TULP1, c.2314C>R (p.Gln772Ter) in RPGRIP1 and c.533G>A (Trp178Ter) in TYR. We also confirmed the previous tentative finding of c.2944 + 1delG in GYCU2D being the most frequent cause of Leber congenital amaurosis (LCA) in Finland. CONCLUSIONS Globally, RD is genetically heterogeneous with over 260 disease genes reported so far. This was shown not to be the case in Finland, where the genetic aetiology of RD is caused by a small group of genes, due to several founder mutations that are enriched in the population. We found that X-chromosomal retinoschisis constitutes the major group in Finnish paediatric RD population and is almost exclusively caused by two founder mutations. Several other founder mutations were detected including three novel founder mutations. All in all, the genetic aetiology of 77% of families was identified which is higher than previously reported from other populations, likely due to the specific genomic constitution of the Finns.
Collapse
Affiliation(s)
- Kristiina Avela
- The Department of Clinical Genetics Helsinki University Hospital, HUSLAB Helsinki Finland
| | | | - Arja Laitinen
- The Department of Ophthalmology Helsinki University Hospital Helsinki Finland
| | - Simon Ramsden
- St Mary′s Hospital Central Manchester University Hospitals and Manchester Centre for Genomic Medicine Manchester UK
| | - Stephanie Barton
- St Mary′s Hospital Central Manchester University Hospitals and Manchester Centre for Genomic Medicine Manchester UK
| | - Sirkka‐Liisa Rudanko
- Visio Low Vision Research Centre Finnish Federation of the Visually Impaired Helsinki Finland
- Finnish Register of Visual Impairment by National Institute for Health and Welfare Helsinki Finland
| |
Collapse
|
27
|
Sarkar H, Moosajee M. Retinol dehydrogenase 12 (RDH12): Role in vision, retinal disease and future perspectives. Exp Eye Res 2019; 188:107793. [PMID: 31505163 DOI: 10.1016/j.exer.2019.107793] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/16/2019] [Revised: 09/06/2019] [Accepted: 09/06/2019] [Indexed: 01/05/2023]
Abstract
Retinol dehydrogenase 12 (RDH12) is an NADPH-dependent retinal reductase, which is expressed in the inner segments of the photoreceptors. It functions as part of the visual cycle, which is a series of enzymatic reactions required for the regeneration of the visual pigment, and has also been implicated in detoxification of lipid peroxidation products. Mutations in RDH12 have been linked to Leber congenital amaurosis (LCA) and autosomal dominant retinitis pigmentosa. A number of in-vitro studies have shown that mutations in RDH12 result in little or no enzyme activity. Knockout mouse models however do not recapitulate the severe phenotype observed in patients, resulting in a limited understanding of the disease mechanisms. With gene replacement and small molecule drugs emerging for inherited retinal dystrophies, herein we provide a review of RDH12 structure, its role in vision and the current understanding of disease mechanisms linked to clinical phenotype to support therapeutic development.
Collapse
Affiliation(s)
- Hajrah Sarkar
- Development, Ageing and Disease, UCL Institute of Ophthalmology, London, EC1V 9EL, UK
| | - Mariya Moosajee
- Development, Ageing and Disease, UCL Institute of Ophthalmology, London, EC1V 9EL, UK; Department of Genetics, Moorfields Eye Hospital NHS Foundation Trust, London, EC1V 2PD, UK; Department of Ophthalmology, Great Ormond Street Hospital for Children NHS Foundation Trust, London, WC1N 3JH, UK.
| |
Collapse
|
28
|
Identification of CRB1 mutations in two Chinese consanguineous families exhibiting autosomal recessive retinitis pigmentosa. Mol Med Rep 2019; 20:2922-2928. [PMID: 31322236 DOI: 10.3892/mmr.2019.10495] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/24/2019] [Accepted: 06/12/2019] [Indexed: 11/05/2022] Open
|
29
|
Aleman TS, Uyhazi KE, Serrano LW, Vasireddy V, Bowman SJ, Ammar MJ, Pearson DJ, Maguire AM, Bennett J. RDH12 Mutations Cause a Severe Retinal Degeneration With Relatively Spared Rod Function. Invest Ophthalmol Vis Sci 2019; 59:5225-5236. [PMID: 30372751 DOI: 10.1167/iovs.18-24708] [Citation(s) in RCA: 35] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022] Open
Abstract
Purpose To describe the retinal phenotype of pediatric patients with mutations in the retinol dehydrogenase 12 (RDH12) gene. Methods Twenty-one patients from 14 families (ages 2-17 years) with RDH12-associated inherited retinal degeneration (RDH12-IRD) underwent a complete ophthalmic exam and imaging with spectral domain optical coherence tomography (SD-OCT) and near infrared and short-wavelength fundus autofluorescence. Visual field extent was measured with Goldmann kinetic perimetry, visual thresholds with dark-adapted static perimetry or with dark-adapted chromatic full-field stimulus testing (FST) and transient pupillometry. Results Visual acuity ranged from 20/40 to light perception. There was parafoveal depigmentation or atrophic maculopathies accompanied by midperipheral intraretinal pigment migration. SD-OCT revealed foveal thinning in all patients and detectable but thinned outer nuclear layer (ONL) at greater eccentricities from the fovea. Photoreceptor outer segment (POS) signals were only detectable in small pockets within the central retina. Measurable kinetic visual fields were limited to small (<5-10°) central islands of vision. Electroretinograms were reported as undetectable or severely reduced in amplitude. FST sensitivities to a 467 nm stimulus were rod-mediated and reduced on average by ∼2.5 log units. A thinned central ONL colocalized with severely reduced to nondetectable cone-mediated sensitivities. Pupillometry confirmed the psychophysically measured abnormalities. Conclusions RDH12-IRD causes an early-onset, retina-wide disease with particularly severe central retinal abnormalities associated with relatively less severe rod photoreceptor dysfunction, a pattern consistent with an early-onset cone-rod dystrophy. Severely abnormal POS but detectable ONL in the pericentral and peripapillary retina suggest these regions may become targets for gene therapy.
Collapse
Affiliation(s)
- Tomas S Aleman
- Scheie Eye Institute at the Perelman Center for Advanced Medicine, Philadelphia, Pennsylvania, United States.,Department of Ophthalmology, Center for Advanced Ocular and Retinal Therapeutics, Perelman School of Medicine, University of Pennsylvania, Philadelphia, Pennsylvania, United States
| | - Katherine E Uyhazi
- Scheie Eye Institute at the Perelman Center for Advanced Medicine, Philadelphia, Pennsylvania, United States
| | - Leona W Serrano
- Scheie Eye Institute at the Perelman Center for Advanced Medicine, Philadelphia, Pennsylvania, United States
| | - Vidyullatha Vasireddy
- Department of Ophthalmology, Center for Advanced Ocular and Retinal Therapeutics, Perelman School of Medicine, University of Pennsylvania, Philadelphia, Pennsylvania, United States
| | - Scott J Bowman
- Scheie Eye Institute at the Perelman Center for Advanced Medicine, Philadelphia, Pennsylvania, United States
| | - Michael J Ammar
- Scheie Eye Institute at the Perelman Center for Advanced Medicine, Philadelphia, Pennsylvania, United States
| | - Denise J Pearson
- Scheie Eye Institute at the Perelman Center for Advanced Medicine, Philadelphia, Pennsylvania, United States
| | - Albert M Maguire
- Scheie Eye Institute at the Perelman Center for Advanced Medicine, Philadelphia, Pennsylvania, United States.,Department of Ophthalmology, Center for Advanced Ocular and Retinal Therapeutics, Perelman School of Medicine, University of Pennsylvania, Philadelphia, Pennsylvania, United States
| | - Jean Bennett
- Scheie Eye Institute at the Perelman Center for Advanced Medicine, Philadelphia, Pennsylvania, United States.,Department of Ophthalmology, Center for Advanced Ocular and Retinal Therapeutics, Perelman School of Medicine, University of Pennsylvania, Philadelphia, Pennsylvania, United States
| |
Collapse
|
30
|
Fahim AT, Bouzia Z, Branham KH, Kumaran N, Vargas ME, Feathers KL, Perera ND, Young K, Khan NW, Heckenlively JR, Webster AR, Pennesi ME, Ali RR, Thompson DA, Michaelides M. Detailed clinical characterisation, unique features and natural history of autosomal recessive RDH12-associated retinal degeneration. Br J Ophthalmol 2019; 103:1789-1796. [PMID: 30979730 DOI: 10.1136/bjophthalmol-2018-313580] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/21/2018] [Revised: 01/28/2019] [Accepted: 02/05/2019] [Indexed: 12/21/2022]
Abstract
BACKGROUND Defects in retinol dehydrogenase 12 (RDH12) account for 3.4%-10.5 % of Leber congenital amaurosis and early-onset severe retinal dystrophy (EOSRD) and are a potential target for gene therapy. Clinical trials in inherited retinal diseases have unique challenges, and natural history studies are critical to successful trial design. The purpose of this study was to characterise the natural history of RDH12-associated retinal degeneration. METHODS A retrospective chart review was performed in individuals with retinal degeneration and two likely disease-causing variants in RDH12. RESULTS 57 subjects were enrolled from nine countries. 33 subjects had clinical records available from childhood. The data revealed an EOSRD, with average age of onset of 4.1 years. Macular atrophy was a universal clinical finding in all subjects, as young as 2 years of age. Scotopic and photopic electroretinography (ERG) responses were markedly reduced in all subjects, and a non-recordable ERG was documented as young as 1 year of age. Assessment of visual acuity, visual field and optical coherence tomography revealed severe loss of function and structure in the majority of subjects after the age of 10 years. Widefield imaging in 23 subjects revealed a unique, variegated watercolour-like pattern of atrophy in 13 subjects and sparing of the peripapillary area in 18 subjects. CONCLUSIONS This study includes the largest collection of phenotypic data from children with RDH12-associated EOSRD and provides a comprehensive description of the timeline of vision loss in this severe, early-onset condition. These findings will help identify patients with RDH12-associated retinal degeneration and will inform future design of therapeutic trials.
Collapse
Affiliation(s)
- Abigail T Fahim
- Department of Ophthalmology and Visual Sciences, University of Michigan, Ann Arbor, Michigan, USA
| | - Zaina Bouzia
- Moorfields Eye Hospital NHS Foundation Trust, London, UK.,Institute of Ophthalmology, University College London, London, UK
| | - Kari H Branham
- Department of Ophthalmology and Visual Sciences, University of Michigan, Ann Arbor, Michigan, USA
| | - Neruban Kumaran
- Moorfields Eye Hospital NHS Foundation Trust, London, UK.,Institute of Ophthalmology, University College London, London, UK
| | - Mauricio E Vargas
- Department of Ophthalmology, Oregon Health & Science University - Casey Eye Institute, Portland, Oregon, USA
| | - Kecia L Feathers
- Department of Ophthalmology and Visual Sciences, University of Michigan, Ann Arbor, Michigan, USA
| | - N Dayanthi Perera
- Department of Ophthalmology and Visual Sciences, University of Michigan, Ann Arbor, Michigan, USA
| | - Kelly Young
- Department of Ophthalmology and Visual Sciences, University of Michigan, Ann Arbor, Michigan, USA
| | - Naheed W Khan
- Department of Ophthalmology and Visual Sciences, University of Michigan, Ann Arbor, Michigan, USA
| | - John R Heckenlively
- Department of Ophthalmology and Visual Sciences, University of Michigan, Ann Arbor, Michigan, USA
| | - Andrew R Webster
- Moorfields Eye Hospital NHS Foundation Trust, London, UK.,Institute of Ophthalmology, University College London, London, UK
| | - Mark E Pennesi
- Department of Ophthalmology, Oregon Health & Science University - Casey Eye Institute, Portland, Oregon, USA
| | - Robin R Ali
- Department of Ophthalmology and Visual Sciences, University of Michigan, Ann Arbor, Michigan, USA.,Institute of Ophthalmology, University College London, London, UK
| | - Debra A Thompson
- Department of Ophthalmology and Visual Sciences, University of Michigan, Ann Arbor, Michigan, USA.,Department of Biological Chemistry, University of Michigan, Ann Arbor, Michigan, USA
| | - Michel Michaelides
- Moorfields Eye Hospital NHS Foundation Trust, London, UK.,Institute of Ophthalmology, University College London, London, UK
| |
Collapse
|
31
|
Navidi M, Yadav S, Struts AV, Brown MF, Nesnas N. Synthesis of 9-CD 3-9- cis-Retinal Cofactor of Isorhodopsin. Tetrahedron Lett 2018; 59:4521-4524. [PMID: 30692701 DOI: 10.1016/j.tetlet.2018.11.034] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
Abstract
We report the synthesis of 9-CD3-9-cis-retinal via a six-step procedure from β-ionone. The steps involve an initial deuteration of the methyl ketone of β-ionone followed by two consecutive Horner-Wadsworth-Emmons (HWE) coupling reactions and their corresponding DIBAL reductions. A final oxidation of the allylic alcohol of the retinol leads to the target compound. This deuterium labeled retinoid is an important cofactor for studying protein-retinoid interactions in isorhodopsin.
Collapse
Affiliation(s)
- Mozhgan Navidi
- Department of Biomedical & Chemical Engineering & Sciences, Florida Institute of Technology, Melbourne, Florida 32901, USA
| | - Shreya Yadav
- Department of Biomedical & Chemical Engineering & Sciences, Florida Institute of Technology, Melbourne, Florida 32901, USA
| | - Andrey V Struts
- Department of Chemistry, University of Arizona, Tucson, Arizona 85721, USA
| | - Michael F Brown
- Department of Chemistry, University of Arizona, Tucson, Arizona 85721, USA
| | - Nasri Nesnas
- Department of Biomedical & Chemical Engineering & Sciences, Florida Institute of Technology, Melbourne, Florida 32901, USA
| |
Collapse
|
32
|
Laíns I, Miller JB, Mukai R, Mach S, Vavvas D, Kim IK, Miller JW, Husain D. HEALTH CONDITIONS LINKED TO AGE-RELATED MACULAR DEGENERATION ASSOCIATED WITH DARK ADAPTATION. Retina 2018; 38:1145-1155. [PMID: 28452839 DOI: 10.1097/iae.0000000000001659] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/05/2023]
Abstract
PURPOSE To determine the association between dark adaption (DA) and different health conditions linked with age-related macular degeneration (AMD). METHODS Cross-sectional study, including patients with AMD and a control group. Age-related macular degeneration was graded according to the Age-Related Eye Disease Study (AREDS) classification. We obtained data on medical history, medications, and lifestyle. Dark adaption was assessed with the extended protocol (20 minutes) of AdaptDx (MacuLogix). For analyses, the right eye or the eye with more advanced AMD was selected. Multivariate linear and logistic regressions were performed, accounting for age and AMD stage. RESULTS Seventy-eight subjects (75.6% AMD; 24.4% controls) were included. Multivariate assessments revealed that body mass index (BMI; β = 0.30, P = 0.045), taking AREDS vitamins (β = 5.51, P < 0.001), and family history of AMD (β = 2.68, P = 0.039) were significantly associated with worse rod intercept times. Abnormal DA (rod intercept time ≥ 6.5 minutes) was significantly associated with family history of AMD (β = 1.84, P = 0.006), taking AREDS supplements (β = 1.67, P = 0.021) and alcohol intake (β = 0.07, P = 0.017). CONCLUSION Besides age and AMD stage, a higher body mass index, higher alcohol intake, and a family history of AMD seem to impair DA. In this cohort, the use of AREDS vitamins was also statistically linked with impaired DA, most likely because of an increased severity of disease in subjects taking them.
Collapse
Affiliation(s)
- Inês Laíns
- Retina Service, Massachusetts Eye and Ear, Department of Ophthalmology, Harvard Medical School, Boston, Massachusetts
- Department of Ophthalmology, Faculty of Medicine, University of Coimbra, Coimbra, Portugal
| | - John B Miller
- Retina Service, Massachusetts Eye and Ear, Department of Ophthalmology, Harvard Medical School, Boston, Massachusetts
| | - Ryo Mukai
- Retina Service, Massachusetts Eye and Ear, Department of Ophthalmology, Harvard Medical School, Boston, Massachusetts
| | - Steven Mach
- Retina Service, Massachusetts Eye and Ear, Department of Ophthalmology, Harvard Medical School, Boston, Massachusetts
| | - Demetrios Vavvas
- Retina Service, Massachusetts Eye and Ear, Department of Ophthalmology, Harvard Medical School, Boston, Massachusetts
| | - Ivana K Kim
- Retina Service, Massachusetts Eye and Ear, Department of Ophthalmology, Harvard Medical School, Boston, Massachusetts
| | - Joan W Miller
- Retina Service, Massachusetts Eye and Ear, Department of Ophthalmology, Harvard Medical School, Boston, Massachusetts
| | - Deeba Husain
- Retina Service, Massachusetts Eye and Ear, Department of Ophthalmology, Harvard Medical School, Boston, Massachusetts
| |
Collapse
|
33
|
Siddiqah IM, Manandhar SP, Cocca SM, Hsueh T, Cervantes V, Gharakhanian E. Yeast ENV9 encodes a conserved lipid droplet (LD) short-chain dehydrogenase involved in LD morphology. Curr Genet 2017; 63:1053-1072. [PMID: 28540421 DOI: 10.1007/s00294-017-0702-y] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/20/2017] [Revised: 04/24/2017] [Accepted: 05/05/2017] [Indexed: 12/31/2022]
Abstract
Lipid droplets (LDs) have emerged as dynamic and interactive organelles with important roles in lipid metabolism and membrane biogenesis. Here, we report that Saccharomyces cerevisiae Env9 is a novel conserved oxidoreductase involved in LD morphology. Microscopic and biochemical studies confirm localization of tagged Env9 to LDs and implicate its C-terminal hydrophobic domain (aa241-265) in its membrane association and stability. Confocal studies reveal a role for Env9 in LD morphology. Env9 positively affects both formation of large LDs upon overexpression and LD proliferation under poor carbon source. In silico bioinformatic and modeling approaches establish that ENV9 is a widely conserved member of the short-chain dehydrogenase (SDR) superfamily. Bayesian phylogenetic studies strongly support ENV9 as an ortholog of human SDR retinol dehydrogenase 12 (RDH12). Dehydrogenase activity of Env9 was confirmed by in vitro oxidoreductase assays. RDH12 mutations have been linked to Leber Congenital Amaurosis. Similar site-directed point mutations in the predicted Env9 oxidoreductase active site (N146L) or cofactor-binding site (G23-24A) abolished its reductase activity in vitro, consistent with those reported in other retinol dehydrogenases. The same residues were essential for affecting LD size and number in vivo. Taken together, our results implicate oxidoreductase activity of Env9 in its cellular role in LD morphology.
Collapse
Affiliation(s)
- Ikha M Siddiqah
- Department of Biological Sciences, California State University Long Beach, 1250 Bellflower Blvd., Long Beach, CA, 90840, USA
| | - Surya P Manandhar
- Department of Biological Sciences, California State University Long Beach, 1250 Bellflower Blvd., Long Beach, CA, 90840, USA
| | - Stephanie M Cocca
- Department of Biological Sciences, California State University Long Beach, 1250 Bellflower Blvd., Long Beach, CA, 90840, USA
| | - Teli Hsueh
- Department of Biological Sciences, California State University Long Beach, 1250 Bellflower Blvd., Long Beach, CA, 90840, USA
| | - Vanessa Cervantes
- Department of Biological Sciences, California State University Long Beach, 1250 Bellflower Blvd., Long Beach, CA, 90840, USA
| | - Editte Gharakhanian
- Department of Biological Sciences, California State University Long Beach, 1250 Bellflower Blvd., Long Beach, CA, 90840, USA.
| |
Collapse
|
34
|
Garg A, Lee W, Sengillo JD, Allikmets R, Garg K, Tsang SH. Peripapillary sparing in RDH12-associated Leber congenital amaurosis. Ophthalmic Genet 2017; 38:575-579. [PMID: 28513254 DOI: 10.1080/13816810.2017.1323339] [Citation(s) in RCA: 23] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
Abstract
BACKGROUND Peripapillary sparing is a characteristic that is traditionally described as pathognomonic for Stargardt disease. MATERIALS AND METHODS We present a multimodal assessment of four Leber congenital amaurosis (LCA) cases with congenital macular atrophy and severely attenuated electroretinogram findings caused by bilallelic mutations in RDH12. RESULTS Fundus autofluorescence imaging revealed a general loss of retinal pigment epithelium across the macula except for the peripapillary region in both eyes of all patients. Spectral domain-optical coherence tomography confirmed relative preservation in this area along with retinal thinning and excavation throughout the rest of the macula. LCA was diagnosed based on clinical exam and retinal imaging, and subsequently confirmed with genetic testing. CONCLUSIONS Peripapillary sparing is a novel phenotypic feature of RDH12-associated LCA.
Collapse
Affiliation(s)
- Aakriti Garg
- a Department of Ophthalmology , College of Physicians and Surgeons, Columbia University , New York , New York , USA
| | - Winston Lee
- a Department of Ophthalmology , College of Physicians and Surgeons, Columbia University , New York , New York , USA.,b Department of Pathology and Cell Biology , College of Physicians and Surgeons, Columbia University , New York , New York , USA.,c Jonas Children's Vision Care and Bernard & Shirlee Brown Glaucoma Laboratory , Columbia University Medical Center , New York , New York , USA
| | - Jesse D Sengillo
- a Department of Ophthalmology , College of Physicians and Surgeons, Columbia University , New York , New York , USA.,c Jonas Children's Vision Care and Bernard & Shirlee Brown Glaucoma Laboratory , Columbia University Medical Center , New York , New York , USA.,d State University of New York Downstate Medical Center , Brooklyn , New York , USA
| | - Rando Allikmets
- a Department of Ophthalmology , College of Physicians and Surgeons, Columbia University , New York , New York , USA.,b Department of Pathology and Cell Biology , College of Physicians and Surgeons, Columbia University , New York , New York , USA
| | - Kartik Garg
- c Jonas Children's Vision Care and Bernard & Shirlee Brown Glaucoma Laboratory , Columbia University Medical Center , New York , New York , USA
| | - Stephen H Tsang
- a Department of Ophthalmology , College of Physicians and Surgeons, Columbia University , New York , New York , USA.,b Department of Pathology and Cell Biology , College of Physicians and Surgeons, Columbia University , New York , New York , USA.,c Jonas Children's Vision Care and Bernard & Shirlee Brown Glaucoma Laboratory , Columbia University Medical Center , New York , New York , USA
| |
Collapse
|
35
|
Unravelling the genetic basis of simplex Retinitis Pigmentosa cases. Sci Rep 2017; 7:41937. [PMID: 28157192 PMCID: PMC5291209 DOI: 10.1038/srep41937] [Citation(s) in RCA: 55] [Impact Index Per Article: 7.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/27/2016] [Accepted: 01/04/2017] [Indexed: 12/20/2022] Open
Abstract
Retinitis Pigmentosa (RP) is the most common form of inherited retinal dystrophy (IRD) characterized ultimately by photoreceptors degeneration. Exhibiting great clinical and genetic heterogeneity, RP can be inherited as an autosomal dominant (ad), autosomal recessive (ar) and X-linked (xl) disorder. Although the relative prevalence of each form varies somewhat between populations, a major proportion (41% in Spain) of patients represent simplex cases (sRP) in which the mode of inheritance is unknown. Molecular genetic diagnostic is crucial, but also challenging, for sRP patients because any of the 81 RP genes identified to date may be causative. Herein, we report the use of a customized targeted gene panel consisting of 68 IRD genes for the molecular characterization of 106 sRP cases. The diagnostic rate was 62.26% (66 of 106) with a proportion of clinical refinements of 30.3%, demonstrating the high efficiency of this genomic approach even for clinically ambiguous cases. The high number of patients diagnosed here has allowed us to study in detail the genetic basis of the sRP. The solved sRP cohort is composed of 62.1% of arRP cases, 24.2% of adRP and 13.6% of xlRP, which implies consequences for counselling of patients and families.
Collapse
|
36
|
Hofmann L, Tsybovsky Y, Alexander NS, Babino D, Leung NY, Montell C, Banerjee S, von Lintig J, Palczewski K. Structural Insights into the Drosophila melanogaster Retinol Dehydrogenase, a Member of the Short-Chain Dehydrogenase/Reductase Family. Biochemistry 2016; 55:6545-6557. [PMID: 27809489 DOI: 10.1021/acs.biochem.6b00907] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/05/2023]
Abstract
The 11-cis-retinylidene chromophore of visual pigments isomerizes upon interaction with a photon, initiating a downstream cascade of signaling events that ultimately lead to visual perception. 11-cis-Retinylidene is regenerated through enzymatic transformations collectively called the visual cycle. The first and rate-limiting enzymatic reaction within this cycle, i.e., the reduction of all-trans-retinal to all-trans-retinol, is catalyzed by retinol dehydrogenases. Here, we determined the structure of Drosophila melanogaster photoreceptor retinol dehydrogenase (PDH) isoform C that belongs to the short-chain dehydrogenase/reductase (SDR) family. This is the first reported structure of a SDR that possesses this biologically important activity. Two crystal structures of the same enzyme grown under different conditions revealed a novel conformational change of the NAD+ cofactor, likely representing a change during catalysis. Amide hydrogen-deuterium exchange of PDH demonstrated changes in the structure of the enzyme upon dinucleotide binding. In D. melanogaster, loss of PDH activity leads to photoreceptor degeneration that can be partially rescued by transgenic expression of human RDH12. Based on the structure of PDH, we analyzed mutations causing Leber congenital amaurosis 13 in a homology model of human RDH12 to obtain insights into the molecular basis of RDH12 disease-causing mutations.
Collapse
Affiliation(s)
- Lukas Hofmann
- Department of Pharmacology and Cleveland Center for Membrane and Structural Biology, School of Medicine, Case Western Reserve University , 10900 Euclid Avenue, Cleveland, Ohio 44106, United States
| | - Yaroslav Tsybovsky
- Department of Pharmacology and Cleveland Center for Membrane and Structural Biology, School of Medicine, Case Western Reserve University , 10900 Euclid Avenue, Cleveland, Ohio 44106, United States
| | - Nathan S Alexander
- Department of Pharmacology and Cleveland Center for Membrane and Structural Biology, School of Medicine, Case Western Reserve University , 10900 Euclid Avenue, Cleveland, Ohio 44106, United States
| | - Darwin Babino
- Department of Pharmacology and Cleveland Center for Membrane and Structural Biology, School of Medicine, Case Western Reserve University , 10900 Euclid Avenue, Cleveland, Ohio 44106, United States
| | - Nicole Y Leung
- Neuroscience Research Institute and Department of Molecular, Cellular, and Developmental Biology, University of California, Santa Barbara , Santa Barbara, California 93106, United States
| | - Craig Montell
- Neuroscience Research Institute and Department of Molecular, Cellular, and Developmental Biology, University of California, Santa Barbara , Santa Barbara, California 93106, United States
| | - Surajit Banerjee
- Department of Chemistry and Chemical Biology, Cornell University , Ithaca, New York 14850, United States.,Northeastern Collaborative Access Team, Argonne National Laboratory , Argonne, Illinois 60439, United States
| | - Johannes von Lintig
- Department of Pharmacology and Cleveland Center for Membrane and Structural Biology, School of Medicine, Case Western Reserve University , 10900 Euclid Avenue, Cleveland, Ohio 44106, United States
| | - Krzysztof Palczewski
- Department of Pharmacology and Cleveland Center for Membrane and Structural Biology, School of Medicine, Case Western Reserve University , 10900 Euclid Avenue, Cleveland, Ohio 44106, United States
| |
Collapse
|
37
|
Sundaramurthy S, Swaminathan M, Sen P, Arokiasamy T, Deshpande S, John N, Gadkari RA, Mannan AU, Soumittra N. Homozygosity mapping guided next generation sequencing to identify the causative genetic variation in inherited retinal degenerative diseases. J Hum Genet 2016; 61:951-958. [DOI: 10.1038/jhg.2016.83] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/21/2016] [Revised: 05/27/2016] [Accepted: 06/03/2016] [Indexed: 11/09/2022]
|
38
|
Huang L, Xiao X, Li S, Jia X, Wang P, Sun W, Xu Y, Xin W, Guo X, Zhang Q. Molecular genetics of cone-rod dystrophy in Chinese patients: New data from 61 probands and mutation overview of 163 probands. Exp Eye Res 2016; 146:252-258. [DOI: 10.1016/j.exer.2016.03.015] [Citation(s) in RCA: 36] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/08/2015] [Revised: 12/27/2015] [Accepted: 03/14/2016] [Indexed: 01/17/2023]
|
39
|
Improving the management of Inherited Retinal Dystrophies by targeted sequencing of a population-specific gene panel. Sci Rep 2016; 6:23910. [PMID: 27032803 PMCID: PMC4817143 DOI: 10.1038/srep23910] [Citation(s) in RCA: 50] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/29/2015] [Accepted: 03/10/2016] [Indexed: 11/08/2022] Open
Abstract
Next-generation sequencing (NGS) has overcome important limitations to the molecular diagnosis of Inherited Retinal Dystrophies (IRD) such as the high clinical and genetic heterogeneity and the overlapping phenotypes. The purpose of this study was the identification of the genetic defect in 32 Spanish families with different forms of IRD. With that aim, we implemented a custom NGS panel comprising 64 IRD-associated genes in our population, and three disease-associated intronic regions. A total of 37 pathogenic mutations (14 novels) were found in 73% of IRD patients ranging from 50% for autosomal dominant cases, 75% for syndromic cases, 83% for autosomal recessive cases, and 100% for X-linked cases. Additionally, unexpected phenotype-genotype correlations were found in 6 probands, which led to the refinement of their clinical diagnoses. Furthermore, intra- and interfamilial phenotypic variability was observed in two cases. Moreover, two cases unsuccessfully analysed by exome sequencing were resolved by applying this panel. Our results demonstrate that this hypothesis-free approach based on frequently mutated, population-specific loci is highly cost-efficient for the routine diagnosis of this heterogeneous condition and allows the unbiased analysis of a miscellaneous cohort. The molecular information found here has aid clinical diagnosis and has improved genetic counselling and patient management.
Collapse
|
40
|
Singh KD, Roschitzki B, Snoek LB, Grossmann J, Zheng X, Elvin M, Kamkina P, Schrimpf SP, Poulin GB, Kammenga JE, Hengartner MO. Natural Genetic Variation Influences Protein Abundances in C. elegans Developmental Signalling Pathways. PLoS One 2016; 11:e0149418. [PMID: 26985669 PMCID: PMC4795773 DOI: 10.1371/journal.pone.0149418] [Citation(s) in RCA: 26] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/18/2015] [Accepted: 01/30/2016] [Indexed: 12/11/2022] Open
Abstract
Complex traits, including common disease-related traits, are affected by many different genes that function in multiple pathways and networks. The apoptosis, MAPK, Notch, and Wnt signalling pathways play important roles in development and disease progression. At the moment we have a poor understanding of how allelic variation affects gene expression in these pathways at the level of translation. Here we report the effect of natural genetic variation on transcript and protein abundance involved in developmental signalling pathways in Caenorhabditis elegans. We used selected reaction monitoring to analyse proteins from the abovementioned four pathways in a set of recombinant inbred lines (RILs) generated from the wild-type strains N2 (Bristol) and CB4856 (Hawaii) to enable quantitative trait locus (QTL) mapping. About half of the cases from the 44 genes tested showed a statistically significant change in protein abundance between various strains, most of these were however very weak (below 1.3-fold change). We detected a distant QTL on the left arm of chromosome II that affected protein abundance of the phosphatidylserine receptor protein PSR-1, and two separate QTLs that influenced embryonic and ionizing radiation-induced apoptosis on chromosome IV. Our results demonstrate that natural variation in C. elegans is sufficient to cause significant changes in signalling pathways both at the gene expression (transcript and protein abundance) and phenotypic levels.
Collapse
Affiliation(s)
- Kapil Dev Singh
- Institute of Molecular Life Sciences, University of Zurich, Zurich, Switzerland
| | - Bernd Roschitzki
- Functional Genomics Center Zurich, University of Zurich and ETH Zurich, Zurich, Switzerland
| | - L. Basten Snoek
- Laboratory of Nematology, Wageningen University, Wageningen, The Netherlands
| | - Jonas Grossmann
- Functional Genomics Center Zurich, University of Zurich and ETH Zurich, Zurich, Switzerland
| | - Xue Zheng
- Institute of Molecular Life Sciences, University of Zurich, Zurich, Switzerland
| | - Mark Elvin
- Faculty of Life Sciences, The University of Manchester, Manchester, United Kingdom
| | - Polina Kamkina
- Institute of Molecular Life Sciences, University of Zurich, Zurich, Switzerland
| | - Sabine P. Schrimpf
- Institute of Molecular Life Sciences, University of Zurich, Zurich, Switzerland
| | - Gino B. Poulin
- Faculty of Life Sciences, The University of Manchester, Manchester, United Kingdom
| | - Jan E. Kammenga
- Laboratory of Nematology, Wageningen University, Wageningen, The Netherlands
| | - Michael O. Hengartner
- Institute of Molecular Life Sciences, University of Zurich, Zurich, Switzerland
- * E-mail:
| |
Collapse
|
41
|
Chebil A, Falfoul Y, Habibi I, Munier F, Schorderet D, El Matri L. Corrélations phénotype–génotype de la rétinopathie pigmentaire non syndromique : à propos de dix familles tunisiennes. J Fr Ophtalmol 2016; 39:277-86. [DOI: 10.1016/j.jfo.2015.08.013] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/31/2015] [Revised: 07/31/2015] [Accepted: 08/28/2015] [Indexed: 11/29/2022]
|
42
|
Xin W, Xiao X, Li S, Zhang Q. Late-onset CORD in a patient with RDH12 mutations identified by whole exome sequencing. Ophthalmic Genet 2016; 37:345-8. [PMID: 26848971 DOI: 10.3109/13816810.2015.1059457] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
Affiliation(s)
- Wei Xin
- a State Key Laboratory of Ophthalmology, Zhongshan Ophthalmic Center, Sun Yat-sen University , Guangzhou , China
| | - Xueshan Xiao
- a State Key Laboratory of Ophthalmology, Zhongshan Ophthalmic Center, Sun Yat-sen University , Guangzhou , China
| | - Shiqiang Li
- a State Key Laboratory of Ophthalmology, Zhongshan Ophthalmic Center, Sun Yat-sen University , Guangzhou , China
| | - Qingjiong Zhang
- a State Key Laboratory of Ophthalmology, Zhongshan Ophthalmic Center, Sun Yat-sen University , Guangzhou , China
| |
Collapse
|
43
|
AlBakri A, Alkuraya FS, Khan AO. Elevation deficiency in children with recessive RDH12-related retinopathy. J AAPOS 2015; 19:568-70. [PMID: 26691045 DOI: 10.1016/j.jaapos.2015.07.281] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/18/2015] [Revised: 07/13/2015] [Accepted: 07/14/2015] [Indexed: 11/15/2022]
Abstract
Children with retinal dystrophies often have nonspecific strabismus, but vertical incomitant deviations are uncommon. We report 4 children from 3 consanguineous families with bilateral elevation deficiency in the context of retinal dystrophy. All were found to harbor recessive mutations in retinal dehydrogenase 12 (RDH12).
Collapse
Affiliation(s)
- Amani AlBakri
- Division of Pediatric Ophthalmology, King Khaled Eye Specialist Hospital, Riyadh, Saudi Arabia
| | - Fowzan S Alkuraya
- Department of Genetics, King Faisal Specialist Hospital and Research Center, Riyadh, Saudi Arabia; Department of Anatomy and Cell Biology, College of Medicine, Alfaisal University, Riyadh, Saudi Arabia
| | - Arif O Khan
- Division of Pediatric Ophthalmology, King Khaled Eye Specialist Hospital, Riyadh, Saudi Arabia; Department of Genetics, King Faisal Specialist Hospital and Research Center, Riyadh, Saudi Arabia.
| |
Collapse
|
44
|
Boulanger-Scemama E, El Shamieh S, Démontant V, Condroyer C, Antonio A, Michiels C, Boyard F, Saraiva JP, Letexier M, Souied E, Mohand-Saïd S, Sahel JA, Zeitz C, Audo I. Next-generation sequencing applied to a large French cone and cone-rod dystrophy cohort: mutation spectrum and new genotype-phenotype correlation. Orphanet J Rare Dis 2015; 10:85. [PMID: 26103963 PMCID: PMC4566196 DOI: 10.1186/s13023-015-0300-3] [Citation(s) in RCA: 79] [Impact Index Per Article: 8.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/15/2014] [Accepted: 06/15/2015] [Indexed: 12/21/2022] Open
Abstract
Background Cone and cone-rod dystrophies are clinically and genetically heterogeneous inherited retinal disorders with predominant cone impairment. They should be distinguished from the more common group of rod-cone dystrophies (retinitis pigmentosa) due to their more severe visual prognosis with early central vision loss. The purpose of our study was to document mutation spectrum of a large French cohort of cone and cone-rod dystrophies. Methods We applied Next-Generation Sequencing targeting a panel of 123 genes implicated in retinal diseases to 96 patients. A systematic filtering approach was used to identify likely disease causing variants, subsequently confirmed by Sanger sequencing and co-segregation analysis when possible. Results Overall, the likely causative mutations were detected in 62.1 % of cases, revealing 33 known and 35 novel mutations. This rate was higher for autosomal dominant (100 %) than autosomal recessive cases (53.8 %). Mutations in ABCA4 and GUCY2D were responsible for 19.2 % and 29.4 % of resolved cases with recessive and dominant inheritance, respectively. Furthermore, unexpected genotype-phenotype correlations were identified, confirming the complexity of inherited retinal disorders with phenotypic overlap between cone-rod dystrophies and other retinal diseases. Conclusions In summary, this time-efficient approach allowed mutation detection in the most important cohort of cone-rod dystrophies investigated so far covering the largest number of genes. Association of known gene defects with novel phenotypes and mode of inheritance were established. Electronic supplementary material The online version of this article (doi:10.1186/s13023-015-0300-3) contains supplementary material, which is available to authorized users.
Collapse
Affiliation(s)
- Elise Boulanger-Scemama
- INSERM, U968, Paris, F-75012, France.,Institut de la Vision, Sorbonne Universités, UPMC Univ Paris 06, UMR_S 968, 17, rue Moreau, Paris, F-75012, France.,CNRS, UMR_7210, Paris, F-75012, France
| | - Said El Shamieh
- INSERM, U968, Paris, F-75012, France.,Institut de la Vision, Sorbonne Universités, UPMC Univ Paris 06, UMR_S 968, 17, rue Moreau, Paris, F-75012, France.,CNRS, UMR_7210, Paris, F-75012, France
| | - Vanessa Démontant
- INSERM, U968, Paris, F-75012, France.,Institut de la Vision, Sorbonne Universités, UPMC Univ Paris 06, UMR_S 968, 17, rue Moreau, Paris, F-75012, France.,CNRS, UMR_7210, Paris, F-75012, France
| | - Christel Condroyer
- INSERM, U968, Paris, F-75012, France.,Institut de la Vision, Sorbonne Universités, UPMC Univ Paris 06, UMR_S 968, 17, rue Moreau, Paris, F-75012, France.,CNRS, UMR_7210, Paris, F-75012, France
| | - Aline Antonio
- INSERM, U968, Paris, F-75012, France.,Institut de la Vision, Sorbonne Universités, UPMC Univ Paris 06, UMR_S 968, 17, rue Moreau, Paris, F-75012, France.,CNRS, UMR_7210, Paris, F-75012, France.,Centre Hospitalier National d'Ophtalmologie des Quinze-Vingts, DHU ViewMaintain, INSERM-DHOS CIC 1423, Paris, F-75012, France
| | - Christelle Michiels
- INSERM, U968, Paris, F-75012, France.,Institut de la Vision, Sorbonne Universités, UPMC Univ Paris 06, UMR_S 968, 17, rue Moreau, Paris, F-75012, France.,CNRS, UMR_7210, Paris, F-75012, France
| | - Fiona Boyard
- INSERM, U968, Paris, F-75012, France.,Institut de la Vision, Sorbonne Universités, UPMC Univ Paris 06, UMR_S 968, 17, rue Moreau, Paris, F-75012, France.,CNRS, UMR_7210, Paris, F-75012, France
| | - Jean-Paul Saraiva
- IntegraGen SA, Genopole CAMPUS 1 bat G8 FR-91030 EVRY, Paris, France
| | - Mélanie Letexier
- IntegraGen SA, Genopole CAMPUS 1 bat G8 FR-91030 EVRY, Paris, France
| | - Eric Souied
- Centre Hospitalier Intercommunal de Créteil, Department of Ophthalmology, Université Paris-Est Créteil, 94000, Créteil, France
| | - Saddek Mohand-Saïd
- INSERM, U968, Paris, F-75012, France.,Institut de la Vision, Sorbonne Universités, UPMC Univ Paris 06, UMR_S 968, 17, rue Moreau, Paris, F-75012, France.,CNRS, UMR_7210, Paris, F-75012, France.,Centre Hospitalier National d'Ophtalmologie des Quinze-Vingts, DHU ViewMaintain, INSERM-DHOS CIC 1423, Paris, F-75012, France
| | - José-Alain Sahel
- INSERM, U968, Paris, F-75012, France.,Institut de la Vision, Sorbonne Universités, UPMC Univ Paris 06, UMR_S 968, 17, rue Moreau, Paris, F-75012, France.,CNRS, UMR_7210, Paris, F-75012, France.,Centre Hospitalier National d'Ophtalmologie des Quinze-Vingts, DHU ViewMaintain, INSERM-DHOS CIC 1423, Paris, F-75012, France.,Fondation Ophtalmologique Adolphe de Rothschild, 75019, Paris, France.,Académie des Sciences-Institut de France, 75006, Paris, France.,University College London Institute of Ophthalmology, 11-43 Bath Street, London, EC1V 9EL, UK
| | - Christina Zeitz
- INSERM, U968, Paris, F-75012, France. .,Institut de la Vision, Sorbonne Universités, UPMC Univ Paris 06, UMR_S 968, 17, rue Moreau, Paris, F-75012, France. .,CNRS, UMR_7210, Paris, F-75012, France.
| | - Isabelle Audo
- INSERM, U968, Paris, F-75012, France. .,Institut de la Vision, Sorbonne Universités, UPMC Univ Paris 06, UMR_S 968, 17, rue Moreau, Paris, F-75012, France. .,CNRS, UMR_7210, Paris, F-75012, France. .,Centre Hospitalier National d'Ophtalmologie des Quinze-Vingts, DHU ViewMaintain, INSERM-DHOS CIC 1423, Paris, F-75012, France. .,University College London Institute of Ophthalmology, 11-43 Bath Street, London, EC1V 9EL, UK.
| |
Collapse
|
45
|
Exome Sequencing Identified a Recessive RDH12 Mutation in a Family with Severe Early-Onset Retinitis Pigmentosa. J Ophthalmol 2015; 2015:942740. [PMID: 26124963 PMCID: PMC4466393 DOI: 10.1155/2015/942740] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/26/2014] [Revised: 04/08/2015] [Accepted: 04/10/2015] [Indexed: 01/11/2023] Open
Abstract
Retinitis pigmentosa (RP) is the most important hereditary retinal disease caused by progressive degeneration of the photoreceptor cells. This study is to identify gene mutations responsible for autosomal recessive retinitis pigmentosa (arRP) in a Chinese family using next-generation sequencing technology. A Chinese family with 7 members including two individuals affected with severe early-onset RP was studied. All patients underwent a complete ophthalmic examination. Exome sequencing was performed on a single RP patient (the proband of this family) and direct Sanger sequencing on other family members and normal controls was followed to confirm the causal mutations. A homozygous mutation c.437T<A (p.V146D) in the retinol dehydrogenase 12 (RDH12) gene, which encodes an NADPH-dependent retinal reductase, was identified as being related to the phenotype of this arRP family. This homozygous mutation was detected in the two affected patients, but not present in other family members and 600 normal controls. Another three normal members in the family were found to carry this heterozygous missense mutation. Our results emphasize the importance of c.437T<A (p.V146D) substitution in RDH12 and provide further support for the causative role of this mutation in the pathogenesis and clinical diagnosis of RP.
Collapse
|
46
|
Farooq A. Structural insights into the functional versatility of WW domain-containing oxidoreductase tumor suppressor. Exp Biol Med (Maywood) 2015; 240:361-74. [PMID: 25662954 DOI: 10.1177/1535370214561586] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022] Open
Abstract
Recent work on WW domain-containing oxidoreductase (WWOX) tumor suppressor is beginning to shed new light on both the molecular mechanism of action of its WW domains as well as the contiguous catalytic domain. Herein, the structural basis underlying the ability of WW1 domain to bind to various physiological ligands and how the orphan WW2 tandem partner synergizes its ligand binding in the context of WW1-WW2 tandem module of WWOX is discussed. Notably, the WW domains within the WW1-WW2 tandem module physically associate so as to adopt a fixed spatial orientation relative to each other. In this manner, the association of WW2 domain with WW1 hinders ligand binding to the latter. Consequently, ligand binding to WW1 domain not only results in the displacement of WW2 lid but also disrupts the fixed orientation of WW domains in the liganded conformation. Equally importantly, structure-guided functional approach suggests that the catalytic domain of WWOX likely serves as a retinal oxidoreductase that catalyzes the reversible oxidation and reduction of all-trans-retinal. Collectively, this review provides structural insights into the functional versatility of a key signaling protein with important implications on its biology.
Collapse
Affiliation(s)
- Amjad Farooq
- Department of Biochemistry & Molecular Biology, Leonard Miller School of Medicine, University of Miami, Miami, FL 33136, USA
| |
Collapse
|
47
|
Yücel-Yılmaz D, Tarlan B, Kıratlı H, Ozgül RK. Genome-wide homozygosity mapping in families with leber congenital amaurosis identifies mutations in AIPL1 and RDH12 genes. DNA Cell Biol 2015; 33:876-83. [PMID: 25148430 DOI: 10.1089/dna.2014.2554] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
Abstract
Leber congenital amaurosis (LCA) causes severe visual impairment and blindness very early in life. Mutant alleles of several genes acting in different pathways, of which all have critical roles for normal retinal function, were involved in LCA development. The purpose of this study was to use genome-wide genotyping to identify LCA-causing loci in two Turkish families. Genome-wide genotyping and haplotype analysis were performed for prioritization of candidate genes for mutation screening in families with LCA. Identified informative critical choromosomal regions obtained by homozygosity mapping from the families were searched for overlapping of any LCA causative genes. Corresponding clinical phenotypes of the patients with identified mutations were evaluated. In this study, two families were shown to be linked to two different LCA loci covering retinol dehydrogenase 12 (RDH12) and aryl-hydrocarbon-interacting protein-like1 (AIPL1) genes. Mutation screening revealed a novel p.Gln141* mutation in the AIPL1 gene and a previously described p.Thr49Met mutation in the RDH12 gene in a homozygous state. Our patients with the RDH12 mutation had the distinct macular coloboma sign, and the patient with the AIPL1 mutation developed microphthalmia and severe widespread retinal pigment epithelial atrophy, in contrast to previously reported cases. It is currently evident that mutation screening needs to be done in at least 18 genes known to be associated with LCA. Thus, homozygosity mapping is an alternative technique to improve the molecular diagnosis in LCA, which is a group of genetically and clinically heterogeneous diseases causing retinal degeneration. The patients without mutation in known genes may further be analyzed by using next-generation sequencing.
Collapse
Affiliation(s)
- Didem Yücel-Yılmaz
- 1 Metabolism Unit, Department of Pediatrics, Institute of Child Health, Hacettepe University , Ankara, Turkey
| | | | | | | |
Collapse
|
48
|
Lhor M, Salesse C. Retinol dehydrogenases: membrane-bound enzymes for the visual function. Biochem Cell Biol 2014; 92:510-23. [PMID: 25357265 DOI: 10.1139/bcb-2014-0082] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022] Open
Abstract
Retinoid metabolism is important for many physiological functions, such as differenciation, growth, and vision. In the visual context, after the absorption of light in rod photoreceptors by the visual pigment rhodopsin, 11-cis retinal is isomerized to all-trans retinal. This retinoid subsequently undergoes a series of modifications during the visual cycle through a cascade of reactions occurring in photoreceptors and in the retinal pigment epithelium. Retinol dehydrogenases (RDHs) are enzymes responsible for crucial steps of this visual cycle. They belong to a large family of proteins designated as short-chain dehydrogenases/reductases. The structure of these RDHs has been predicted using modern bioinformatics tools, which allowed to propose models with similar structures including a common Rossman fold. These enzymes undergo oxidoreduction reactions, whose direction is dictated by the preference and concentration of their individual cofactor (NAD(H)/NADP(H)). This review presents the current state of knowledge on functional and structural features of RDHs involved in the visual cycle as well as knockout models. RDHs are described as integral or peripheral enzymes. A topology model of the membrane binding of these RDHs via their N- and (or) C-terminal domain has been proposed on the basis of their individual properties. Membrane binding is a crucial issue for these enzymes because of the high hydrophobicity of their retinoid substrates.
Collapse
Affiliation(s)
- Mustapha Lhor
- a CUO-Recherche, Centre de recherche du CHU de Québec, Hôpital du Saint Sacrement, Département d'ophtalmologie, Faculté de médicine, Université Laval, Québec, QC G1S 4L8, Canada
| | | |
Collapse
|
49
|
Identity-by-descent-guided mutation analysis and exome sequencing in consanguineous families reveals unusual clinical and molecular findings in retinal dystrophy. Genet Med 2014; 16:671-80. [PMID: 24625443 DOI: 10.1038/gim.2014.24] [Citation(s) in RCA: 45] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/16/2013] [Accepted: 02/05/2014] [Indexed: 01/26/2023] Open
Abstract
PURPOSE Autosomal recessive retinal dystrophies are clinically and genetically heterogeneous, which hampers molecular diagnosis. We evaluated identity-by-descent-guided Sanger sequencing or whole-exome sequencing in 26 families with nonsyndromic (19) or syndromic (7) autosomal recessive retinal dystrophies to identify disease-causing mutations. METHODS Patients underwent genome-wide identity-by-descent mapping followed by Sanger sequencing (16) or whole-exome sequencing (10). Whole-exome sequencing data were filtered against identity-by-descent regions and known retinal dystrophy genes. The medical history was reviewed in mutation-positive families. RESULTS We identified mutations in 14 known retinal dystrophy genes in 20/26 (77%) families: ABCA4, CERKL, CLN3, CNNM4, C2orf71, IQCB1, LRAT, MERTK, NMNAT1, PCDH15, PDE6B, RDH12, RPGRIP1, and USH2A. Whole-exome sequencing in single individuals revealed mutations in either the largest or smaller identity-by-descent regions, and a compound heterozygous genotype in NMNAT1. Moreover, a novel deletion was found in PCDH15. In addition, we identified mutations in CLN3, CNNM4, and IQCB1 in patients initially diagnosed with nonsyndromic retinal dystrophies. CONCLUSION Our study emphasized that identity-by-descent-guided mutation analysis and/or whole-exome sequencing are powerful tools for the molecular diagnosis of retinal dystrophy. Our approach uncovered unusual molecular findings and unmasked syndromic retinal dystrophies, guiding future medical management. Finally, elucidating ABCA4, LRAT, and MERTK mutations offers potential gene-specific therapeutic perspectives.
Collapse
|
50
|
Exome sequencing identifies RDH12 compound heterozygous mutations in a family with severe retinitis pigmentosa. Gene 2013; 528:178-82. [PMID: 23900199 DOI: 10.1016/j.gene.2013.07.021] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/22/2013] [Revised: 06/26/2013] [Accepted: 07/02/2013] [Indexed: 11/24/2022]
Abstract
OBJECTIVE Retinitis pigmentosa (RP) is the most prevalent type of inherited retinal degeneration and one of the commonest causes of genetically determined visual dysfunction worldwide. To date, approximately 35 genes have been associated with nonsyndromic autosomal recessive RP (arRP), however the small contribution of each gene to the total prevalence of arRP and the lack of a clear genotype-phenotype correlation complicate the genetic analysis in affected patients. Next generation sequencing technologies are powerful and cost-effective methods for detecting causative mutations in both sporadic and familial RP cases. METHODS A Mexican family with 5 members affected from arRP was studied. All patients underwent a complete ophthalmologic examination. Molecular methods included genome-wide SNP homozygosity mapping, exome sequencing analysis, and Sanger-sequencing confirmation of causal mutations. RESULTS No regions of shared homozygosity among affected subjects were identified. Exome sequencing in a single patient allowed the detection of two missense mutations in the RDH12 gene: a c.446T>C transition predicting a novel p.L149P substitution, and a c.295C>A transversion predicting a previously reported p.L99I replacement. Sanger sequencing confirmed that all affected subjects carried both RDH12 mutations. CONCLUSIONS This study adds to the molecular spectrum of RDH12-related retinopathy and offers an additional example of the power of exome sequencing in the diagnosis of recessively inherited retinal degenerations.
Collapse
|