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Lisbjerg K, Bertelsen M, Grønskov K, Kessel L. Clinical characterization of patients with PRPF31-related retinitis pigmentosa and asymptomatic carriers: a cross-sectional study. Ophthalmic Genet 2023; 44:456-464. [PMID: 37293790 DOI: 10.1080/13816810.2023.2219732] [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: 12/29/2022] [Revised: 04/27/2023] [Accepted: 05/25/2023] [Indexed: 06/10/2023]
Abstract
BACKGROUND/AIM To describe the clinical phenotype of retinitis pigmentosa (RP) caused by PRPF31-variants and clinical characterization of asymptomatic PRPF31 carriers. MATERIALS AND METHODS We conducted a descriptive cross-sectional deep phenotyping study. We included subjects with PRPF31 variants predicted to be disease-causing, both individuals with RP and asymptomatic carriers. Participants underwent a comprehensive clinical examination of standard visual function parameters (visual acuity, contrast sensitivity, Goldmann visual field), full-field stimulus threshold (FST), full-field electroretinogram (ff-ERG), and a structural investigation with slit lamp and multimodal imaging. We used Spearman correlation analyses to evaluate associations between quantitative outcomes. RESULTS We included 21 individuals with disease-causing PRPF31-variants: 16 symptomatic and 5 asymptomatic subjects. The symptomatic subjects demonstrated a typical RP phenotype with constricted visual fields, extinguished ff-ERG, and disrupted outer retinal anatomy. FST was impaired and correlated significantly with other outcome measures in RP subjects. Structure-function correlations with Spearman correlation analysis showed moderate correlation coefficients due to a few outliers in each analysis. The asymptomatic individuals had normal best-corrected visual acuity and visual fields, but showed reduced ff-ERG amplitudes, borderline FST sensitivity, and structural abnormalities on OCT and fundoscopy. CONCLUSIONS RP11 has a typical RP phenotype but varies in terms of severity. FST measurements correlated well with other functional and structural metrics and may be a reliable outcome measure in future trials as it is sensitive to a broad range of disease severities. Asymptomatic carriers showed sub-clinical disease manifestations, and our findings underline that reported non-penetrance in PRPF31-related RP is not an all-or-none phenomenon.
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Affiliation(s)
- Kristian Lisbjerg
- Department of Ophthalmology, Copenhagen University Hospital - Rigshospitalet, Copenhagen, Denmark
| | - Mette Bertelsen
- Department of Clinical Genetics, Copenhagen University Hospital - Rigshospitalet, Copenhagen, Denmark
| | - Karen Grønskov
- Department of Clinical Genetics, Copenhagen University Hospital - Rigshospitalet, Copenhagen, Denmark
| | - Line Kessel
- Department of Ophthalmology, Copenhagen University Hospital - Rigshospitalet, Copenhagen, Denmark
- Department of Clinical Medicine, University of Copenhagen, Copenhagen, Denmark
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Duncan JL, Liang W, Maguire MG, Porco TC, Wong J, Audo I, Cava JA, Grieve K, Kalitzeos A, Kreis J, Michaelides M, Norberg N, Paques M, Carroll J. Change in Cone Structure Over 24 Months in USH2A-Related Retinal Degeneration. Am J Ophthalmol 2023; 252:77-93. [PMID: 36948373 PMCID: PMC11087021 DOI: 10.1016/j.ajo.2023.03.006] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/22/2022] [Revised: 03/01/2023] [Accepted: 03/07/2023] [Indexed: 03/24/2023]
Abstract
PURPOSE To describe cone structure changes using adaptive optics scanning laser ophthalmoscopy (AOSLO) in the Rate of Progression of USH2A-related Retinal Degeneration (RUSH2A) study. DESIGN Multicenter, longitudinal natural history study. METHODS AOSLO images were acquired at 4 centers, twice at baseline and annually for 24 months in this natural history study. For each eye, at least 10 regions of interest (ROIs) with ≥50 contiguous cones were analyzed by masked, independent graders. Cone spacing Z-scores, standard deviations from the normal mean at the measured location, were compared between graders and tests at baseline. The association of cone spacing with clinical characteristics was assessed using linear mixed effects regression models weighted by image quality score. Annual rates of change were calculated based on differences between visits. RESULTS Fourteen eyes of 14 participants were imaged, with 192 ROIs selected at baseline. There was variability among graders, which was greater in images with lower image quality score (P < .001). Cone spacing was significantly correlated with eccentricity, quality score, and disease duration (P < .02). On average, the cone spacing Z-score increased 0.14 annually (about 9%, P < .001). We observed no significant differences in rate of change between disease type (Usher syndrome or retinitis pigmentosa), imaging site, or grader. CONCLUSIONS Using current methods, the analysis of quantitative measures of cone structure showed some challenges, yet showed promise that AOSLO images can be used to characterize progressive change over 24 months. Additional multicenter studies using AOSLO are needed to advance cone mosaic metrics as sensitive outcome measures for clinical trials. NOTE: Publication of this article is sponsored by the American Ophthalmological Society.
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Affiliation(s)
| | - Wendi Liang
- Jaeb Center for Health Research, Tampa, FL, USA
| | | | | | - Jessica Wong
- University of California, San Francisco, CA, USA
| | - Isabelle Audo
- Quinze Vingts National Ophthalmology Hospital, Paris, France
| | - Jenna A Cava
- Medical College of Wisconsin, Milwaukee, WI, USA
| | - Kate Grieve
- Quinze Vingts National Ophthalmology Hospital, Paris, France
| | | | - Joseph Kreis
- Medical College of Wisconsin, Milwaukee, WI, USA
| | | | | | - Michel Paques
- Quinze Vingts National Ophthalmology Hospital, Paris, France
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Lisbjerg K, Bertelsen M, Lyng Forman J, Grønskov K, Prener Holtan J, Kessel L. Disease progression of retinitis pigmentosa caused by PRPF31 variants in a Nordic population: a retrospective study with up to 36 years follow-up. Ophthalmic Genet 2023; 44:139-146. [PMID: 36164253 DOI: 10.1080/13816810.2022.2123006] [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: 10/14/2022]
Abstract
BACKGROUND/AIMS To investigate the natural history of PRPF31-related retinitis pigmentosa (RP11). MATERIALS AND METHODS We identified individuals with RP11 and collected retrospective data from disease onset to present date including genetics, demographic data, Goldmann visual field areas, and visual acuity measurements. Visual fields were evaluated as summed squared degrees and best-corrected visual acuity was converted to logMAR. We performed linear mixed model regression analysis to evaluate annual disease progression, and survival analysis to evaluate the age of legal blindness. RESULTS We included 46 subjects with RP11. Median age of disease onset was 10 years (range 5-65). Follow-up spanned from 0 to 36 years with a median of 8 years. Median Goldmann visual field areas decreased by 10.0% per year (95% CI 7.5%-12.4%) with target IV4e, 7.9% (95% CI 4.5% - 11.2%) with target III4e, and 9.3% (95% CI: 7.0% -11.5%) when combining target sizes. Individuals with RP11 maintained good visual acuity until late stage of disease. Legal blindness was reached at a median age of 57 years (95% CI 50-75 years). CONCLUSIONS PRPF31 variants cause autosomal dominant retinitis pigmentosa that most commonly manifests in childhood with a variable disease progression. Visual field area deteriorates faster than visual acuity and was the major cause of legal blindness in our study population. This study characterizes disease progression in retinitis pigmentosa caused by PRPF31-variants and demonstrates the importance of differentiation between specific genotypes when counselling patients and conducting natural history studies of RP.
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Affiliation(s)
- Kristian Lisbjerg
- Department of Ophthalmology, Copenhagen University Hospital - Rigshospitalet-Glostrup, Copenhagen, Denmark
| | - Mette Bertelsen
- Department of Clinical Genetics, Copenhagen University Hospital - Rigshospitalet, Copenhagen, Denmark
| | - Julie Lyng Forman
- Section of Biostatistics, Department of Public Health, University of Copenhagen, Copenhagen, Denmark
| | - Karen Grønskov
- Department of Clinical Genetics, Copenhagen University Hospital - Rigshospitalet, Copenhagen, Denmark
| | | | - Line Kessel
- Department of Ophthalmology, Copenhagen University Hospital - Rigshospitalet-Glostrup, Copenhagen, Denmark
- Department of Clinical Medicine, University of Copenhagen, Copenhagen, Denmark
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Lisbjerg K, Grønskov K, Bertelsen M, Møller LB, Kessel L. Genetic Modifiers of Non-Penetrance and RNA Expression Levels in PRPF31-Associated Retinitis Pigmentosa in a Danish Cohort. Genes (Basel) 2023; 14:435. [PMID: 36833363 PMCID: PMC9956082 DOI: 10.3390/genes14020435] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/29/2022] [Revised: 02/03/2023] [Accepted: 02/07/2023] [Indexed: 02/11/2023] Open
Abstract
(1) Background/aims: To examine potential genetic modifiers of disease penetrance in PRPF31-associated retinitis pigmentosa 11 (RP11). (2) Methods: Blood samples from individuals (n = 37) with PRPF31 variants believed to be disease-causing were used for molecular genetic testing and, in some cases (n = 23), also for mRNA expression analyses. Medical charts were used to establish if individuals were symptomatic (RP) or asymptomatic non-penetrant carriers (NPC). RNA expression levels of PRPF31 and CNOT3 were measured on peripheral whole blood using quantitative real-time PCR normalized to GAPDH. Copy number variation of minisatellite repeat element 1 (MSR1) was performed with DNA fragment analysis. (3) Results: mRNA expression analyses on 22 individuals (17 with RP and 5 non-penetrant carriers) revealed no statistically significant differences in PRPF31 or CNOT3 mRNA expression levels between individuals with RP and non-penetrant carriers. Among 37 individuals, we found that all three carriers of a 4-copy MSR1 sequence on their wild-type (WT) allele were non-penetrant carriers. However, copy number variation of MSR1 is not the sole determinant factor of non-penetrance, as not all non-penetrant carriers carried a 4-copy WT allele. A 4-copy MSR1 mutant allele was not associated with non-penetrance. (4) Conclusions: In this Danish cohort, a 4-copy MSR1 WT allele was associated with non-penetrance of retinitis pigmentosa caused by PRPF31 variants. The level of PRPF31 mRNA expression in peripheral whole blood was not a useful indicator of disease status.
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Affiliation(s)
- Kristian Lisbjerg
- Department of Ophthalmology, Copenhagen University Hospital-Rigshospitalet, 2600 Glostrup, Denmark
| | - Karen Grønskov
- Department of Clinical Genetics, Copenhagen University Hospital-Rigshospitalet, 2100 Copenhagen, Denmark
| | - Mette Bertelsen
- Department of Clinical Genetics, Copenhagen University Hospital-Rigshospitalet, 2100 Copenhagen, Denmark
| | - Lisbeth Birk Møller
- Department of Clinical Genetics, Copenhagen University Hospital-Rigshospitalet, 2100 Copenhagen, Denmark
| | - Line Kessel
- Department of Ophthalmology, Copenhagen University Hospital-Rigshospitalet, 2600 Glostrup, Denmark
- Department of Clinical Medicine, University of Copenhagen, 2200 Copenhagen, Denmark
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Chen Z, Chen J, Gao M, Liu Y, Wu Y, Wang Y, Gong Y, Yu S, Liu W, Wan X, Sun X. Comprehensive analysis of the PRPF31 gene in retinitis pigmentosa patients: Four novel Alu-mediated copy number variations at the PRPF31 locus. Hum Mutat 2022; 43:2279-2294. [PMID: 36317469 DOI: 10.1002/humu.24494] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/07/2022] [Revised: 10/10/2022] [Accepted: 10/24/2022] [Indexed: 11/11/2022]
Abstract
Retinitis pigmentosa (RP) is a monogenic disease characterized by irreversible degeneration of the retina. PRPF31, the second most common causative gene of autosomal dominant RP, frequently harbors copy number variations (CNVs), but the underlying mechanism is unclear. In this study, we summarized the phenotypic and genotypic characteristics of 18 RP families (F01-F18) with variants in PRPF31. The prevalence of PRPF31 variants in our cohort of Chinese RP families was 1.7% (18/1024). Seventeen different variants in PRPF31 were detected, including eight novel variants. Notably, four novel CNVs encompassing PRPF31, with a proportion of 22.2% (4/18), were validated to harbor gross deletions involving Alu/Alu-mediated rearrangements (AAMRs) in the same orientation. Among a total of 12 CNVs of PRPF31 with breakpoints mapped on nucleotide-resolution, 10 variants (83.3%) were presumably mediated by Alu elements. Furthermore, we described the correlation between the genotypes and phenotypes in PRPF31-related RP. Our findings expand the mutational spectrum of the PRPF31 gene and provide strong evidence that Alu elements of PRPF31 probably contribute to the susceptibility to genomic rearrangement in this locus.
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Affiliation(s)
- Zhixuan Chen
- Department of Ophthalmology, School of Medicine, Shanghai General Hospital (Shanghai First People's Hospital), Shanghai Jiao Tong University, Shanghai, China.,Department of Ophthalmology, National Clinical Research Center for Eye Diseases, Shanghai, China.,Department of Ophthalmology, Shanghai Key Laboratory of Fundus Diseases, Shanghai, China.,Department of Ophthalmology, Shanghai Engineering Center for Visual Science and Photomedicine, Shanghai, China
| | - Jieqiong Chen
- Department of Ophthalmology, School of Medicine, Shanghai General Hospital (Shanghai First People's Hospital), Shanghai Jiao Tong University, Shanghai, China.,Department of Ophthalmology, National Clinical Research Center for Eye Diseases, Shanghai, China.,Department of Ophthalmology, Shanghai Key Laboratory of Fundus Diseases, Shanghai, China.,Department of Ophthalmology, Shanghai Engineering Center for Visual Science and Photomedicine, Shanghai, China
| | - Min Gao
- Department of Ophthalmology, School of Medicine, Shanghai General Hospital (Shanghai First People's Hospital), Shanghai Jiao Tong University, Shanghai, China.,Department of Ophthalmology, National Clinical Research Center for Eye Diseases, Shanghai, China.,Department of Ophthalmology, Shanghai Key Laboratory of Fundus Diseases, Shanghai, China.,Department of Ophthalmology, Shanghai Engineering Center for Visual Science and Photomedicine, Shanghai, China
| | - Yang Liu
- Department of Ophthalmology, School of Medicine, Shanghai General Hospital (Shanghai First People's Hospital), Shanghai Jiao Tong University, Shanghai, China.,Department of Ophthalmology, National Clinical Research Center for Eye Diseases, Shanghai, China.,Department of Ophthalmology, Shanghai Key Laboratory of Fundus Diseases, Shanghai, China.,Department of Ophthalmology, Shanghai Engineering Center for Visual Science and Photomedicine, Shanghai, China
| | - Yidong Wu
- Department of Ophthalmology, School of Medicine, Shanghai General Hospital (Shanghai First People's Hospital), Shanghai Jiao Tong University, Shanghai, China.,Department of Ophthalmology, National Clinical Research Center for Eye Diseases, Shanghai, China.,Department of Ophthalmology, Shanghai Key Laboratory of Fundus Diseases, Shanghai, China.,Department of Ophthalmology, Shanghai Engineering Center for Visual Science and Photomedicine, Shanghai, China
| | - Yafang Wang
- Department of Ophthalmology, School of Medicine, Shanghai General Hospital (Shanghai First People's Hospital), Shanghai Jiao Tong University, Shanghai, China.,Department of Ophthalmology, National Clinical Research Center for Eye Diseases, Shanghai, China.,Department of Ophthalmology, Shanghai Key Laboratory of Fundus Diseases, Shanghai, China.,Department of Ophthalmology, Shanghai Engineering Center for Visual Science and Photomedicine, Shanghai, China
| | - Yuanyuan Gong
- Department of Ophthalmology, School of Medicine, Shanghai General Hospital (Shanghai First People's Hospital), Shanghai Jiao Tong University, Shanghai, China.,Department of Ophthalmology, National Clinical Research Center for Eye Diseases, Shanghai, China.,Department of Ophthalmology, Shanghai Key Laboratory of Fundus Diseases, Shanghai, China.,Department of Ophthalmology, Shanghai Engineering Center for Visual Science and Photomedicine, Shanghai, China
| | - Suqin Yu
- Department of Ophthalmology, School of Medicine, Shanghai General Hospital (Shanghai First People's Hospital), Shanghai Jiao Tong University, Shanghai, China.,Department of Ophthalmology, National Clinical Research Center for Eye Diseases, Shanghai, China.,Department of Ophthalmology, Shanghai Key Laboratory of Fundus Diseases, Shanghai, China.,Department of Ophthalmology, Shanghai Engineering Center for Visual Science and Photomedicine, Shanghai, China
| | - Wenjia Liu
- Department of Ophthalmology, School of Medicine, Shanghai General Hospital (Shanghai First People's Hospital), Shanghai Jiao Tong University, Shanghai, China.,Department of Ophthalmology, National Clinical Research Center for Eye Diseases, Shanghai, China.,Department of Ophthalmology, Shanghai Key Laboratory of Fundus Diseases, Shanghai, China.,Department of Ophthalmology, Shanghai Engineering Center for Visual Science and Photomedicine, Shanghai, China
| | - Xiaoling Wan
- Department of Ophthalmology, School of Medicine, Shanghai General Hospital (Shanghai First People's Hospital), Shanghai Jiao Tong University, Shanghai, China.,Department of Ophthalmology, National Clinical Research Center for Eye Diseases, Shanghai, China.,Department of Ophthalmology, Shanghai Key Laboratory of Fundus Diseases, Shanghai, China.,Department of Ophthalmology, Shanghai Engineering Center for Visual Science and Photomedicine, Shanghai, China
| | - Xiaodong Sun
- Department of Ophthalmology, School of Medicine, Shanghai General Hospital (Shanghai First People's Hospital), Shanghai Jiao Tong University, Shanghai, China.,Department of Ophthalmology, National Clinical Research Center for Eye Diseases, Shanghai, China.,Department of Ophthalmology, Shanghai Key Laboratory of Fundus Diseases, Shanghai, China.,Department of Ophthalmology, Shanghai Engineering Center for Visual Science and Photomedicine, Shanghai, China
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