Genotype-Phenotype Correlations in a Spanish Cohort of 506 Families With Biallelic ABCA4 Pathogenic Variants
| Autor: | Marta Del Pozo-Valero, I. Lorda-Sánchez, Rosa Riveiro-Alvarez, Marta Corton, Fiona Blanco-Kelly, María José Trujillo-Tiebas, Belen Jimenez-Rolando, Blanca Garcia-Sandoval, Almudena Avila-Fernandez, Inmaculada Martin-Merida, Carmen Ayuso, Carlo Rivolta, Elvira Rodriguez-Pinilla, Jana Aguirre-Lamban, Ester Carreño, Ionut-Florin Iancu, Ignacio Mahillo-Fernández, Saoud Tahsin Swafiri |
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| Rok vydání: | 2020 |
| Předmět: |
Adult
Male Mutation Missense Visual Acuity ABCA4 Disease Polymorphism Single Nucleotide Cohort Studies 03 medical and health sciences Young Adult 0302 clinical medicine medicine Electroretinography Missense mutation Humans Stargardt Disease Medical history Age of Onset Alleles Genetic Association Studies 030304 developmental biology Genetics 0303 health sciences biology Variant type business.industry High-Throughput Nucleotide Sequencing Middle Aged medicine.disease Pedigree Stargardt disease Ophthalmology Spain Cohort 030221 ophthalmology & optometry biology.protein ATP-Binding Cassette Transporters Female business Cone-Rod Dystrophies Tomography Optical Coherence Cohort study Microsatellite Repeats |
| Zdroj: | American journal of ophthalmology. 219 |
| ISSN: | 1879-1891 |
| Popis: | Purpose To define genotype–phenotype correlations in the largest cohort study worldwide of patients with biallelic ABCA4 variants, including 434 patients with Stargardt disease (STGD1) and 72 with cone-rod dystrophy (CRD). Design Cohort study. Methods We characterized 506 patients with ABCA4 variants using conventional genetic tools and next-generation sequencing technologies. Medical history and ophthalmologic data were obtained from 372 patients. Genotype–phenotype correlation studies were carried out for the following variables: variant type, age at symptom onset (AO), and clinical phenotype. Results A total of 228 different pathogenic variants were identified in 506 ABCA4 patients, 50 of which were novel. Genotype–phenotype correlations showed that most of the patients with biallelic truncating variants presented with CRD and that these cases had a significantly earlier AO than patients with STGD1. Three missense variants are associated with CRD for the first time (c.1804C>T; p.[Arg602Trp], c.3056C>T; p.[Thr1019Met], and c.6320G>C; p.[Arg2107Pro]). Analysis of the most prevalent ABCA4 variant in Spain, c.3386G>T; p.(Arg1129Leu), revealed that is correlated to STGD1, later AO, and foveal sparing. Conclusions Our study, conducted in the largest ABCA4-associated disease cohort reported to date, updates the genotype–phenotype model established for ABCA4 variants and broadens the mutational spectrum of the gene. According to our observations, patients with ABCA4 presenting with 2 truncating variants may first present features of STGD1 but eventually develop rod dysfunction, and specific missense variants may be associated with a different phenotype, underscoring the importance of an accurate genetic diagnosis. Also, it is a prerequisite for enrollment in clinical trials, and to date, no other treatment has been approved for STGD1. |
| Databáze: | OpenAIRE |
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