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Martin-Merida I, Sanchez-Alcudia R, Fernandez-San Jose P, Blanco-Kelly F, Perez-Carro R, Rodriguez-Jacy da Silva L, Almoguera B, Garcia-Sandoval B, Lopez-Molina MI, Avila-Fernandez A, Carballo M, Corton M, Ayuso C. Analysis of the PRPF31 Gene in Spanish Autosomal Dominant Retinitis Pigmentosa Patients: A Novel Genomic Rearrangement. Invest Ophthalmol Vis Sci 2017; 58:1045-1053. [PMID: 28192796 DOI: 10.1167/iovs.16-20515] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022] Open
Abstract
Purpose The aim was to determine the prevalence of PRPF31 mutations in a cohort of Spanish autosomal dominant retinitis pigmentosa (adRP) families to deepen knowledge of the pathogenic mechanisms underlying the disease and to assess genotype-phenotype correlations. Methods A cohort of 211 adRP patients was screened for variants in PRPF31 by using a combined strategy comprising next-generation sequencing approaches and copy-number variation (CNV) analysis. Quantitative RT-PCR and CNV analysis of the regulatory MSR1 element were also performed to assess PRPF31 gene expression. Phenotype was assessed by using ophthalmologic examination protocols. Results Fifteen different causative mutations and genomic rearrangements were identified, revealing five novel mutations. Prevalence of PRPF31 mutations, genomic rearrangements, and lack of penetrance were 7.6%, 1.9%, and 66.7%, respectively. Interestingly, we identified a tandem duplication and a partial PRPF31 deletion in different affected individuals from the same family. PRPF31 gene expression was significantly decreased in symptomatic cases carrying either PRPF31 duplication or deletion as compared to controls. The 4 MSR1 allele in cis with the PRPF31 wild-type allele was apparently a protective factor. The mutated phenotype varied from no symptoms to typical retinitis pigmentosa with variable onset and course depending on the kind of mutation, with the duplication case the most severe. Conclusions In view of the high genetic heterogeneity of PRPF31 mutations, the screening must include the entire gene, as well as CNV assays, to detect large rearrangements. This is the first report of a variable phenotype correlation as well as a gross duplication and deletion within the same family.
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Affiliation(s)
- Inmaculada Martin-Merida
- Department of Genetics, Instituto de Investigacion Sanitaria-Fundacion Jimenez Diaz University Hospital-Universidad Autónoma de Madrid (IIS-FJD, UAM), Madrid, Spain 2Center for Biomedical Network Research on Rare Diseases (CIBERER), ISCIII, Madrid, Spain
| | - Rocio Sanchez-Alcudia
- Department of Genetics, Instituto de Investigacion Sanitaria-Fundacion Jimenez Diaz University Hospital-Universidad Autónoma de Madrid (IIS-FJD, UAM), Madrid, Spain 2Center for Biomedical Network Research on Rare Diseases (CIBERER), ISCIII, Madrid, Spain
| | - Patricia Fernandez-San Jose
- Department of Genetics, Instituto de Investigacion Sanitaria-Fundacion Jimenez Diaz University Hospital-Universidad Autónoma de Madrid (IIS-FJD, UAM), Madrid, Spain 2Center for Biomedical Network Research on Rare Diseases (CIBERER), ISCIII, Madrid, Spain
| | - Fiona Blanco-Kelly
- Department of Genetics, Instituto de Investigacion Sanitaria-Fundacion Jimenez Diaz University Hospital-Universidad Autónoma de Madrid (IIS-FJD, UAM), Madrid, Spain 2Center for Biomedical Network Research on Rare Diseases (CIBERER), ISCIII, Madrid, Spain
| | - Raquel Perez-Carro
- Department of Genetics, Instituto de Investigacion Sanitaria-Fundacion Jimenez Diaz University Hospital-Universidad Autónoma de Madrid (IIS-FJD, UAM), Madrid, Spain 2Center for Biomedical Network Research on Rare Diseases (CIBERER), ISCIII, Madrid, Spain
| | | | - Berta Almoguera
- Center for Applied Genomics, The Children's Hospital of Philadelphia, Philadelphia, Pennsylvania, United States
| | - Blanca Garcia-Sandoval
- Department of Ophthalmology, Instituto de Investigacion Sanitaria-Fundacion Jimenez Diaz University Hospital-Universidad Autónoma de Madrid (IIS-FJD, UAM), Madrid, Spain
| | - Maria Isabel Lopez-Molina
- Department of Ophthalmology, Instituto de Investigacion Sanitaria-Fundacion Jimenez Diaz University Hospital-Universidad Autónoma de Madrid (IIS-FJD, UAM), Madrid, Spain
| | - Almudena Avila-Fernandez
- Department of Genetics, Instituto de Investigacion Sanitaria-Fundacion Jimenez Diaz University Hospital-Universidad Autónoma de Madrid (IIS-FJD, UAM), Madrid, Spain 2Center for Biomedical Network Research on Rare Diseases (CIBERER), ISCIII, Madrid, Spain
| | - Miguel Carballo
- Molecular Genetics Unit, Hospital de Terrassa, Terrassa, Barcelona, Spain
| | - Marta Corton
- Department of Genetics, Instituto de Investigacion Sanitaria-Fundacion Jimenez Diaz University Hospital-Universidad Autónoma de Madrid (IIS-FJD, UAM), Madrid, Spain 2Center for Biomedical Network Research on Rare Diseases (CIBERER), ISCIII, Madrid, Spain
| | - Carmen Ayuso
- Department of Genetics, Instituto de Investigacion Sanitaria-Fundacion Jimenez Diaz University Hospital-Universidad Autónoma de Madrid (IIS-FJD, UAM), Madrid, Spain 2Center for Biomedical Network Research on Rare Diseases (CIBERER), ISCIII, Madrid, Spain
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