Clinical and Genetic Spectrum of Stargardt Disease in Argentinean Patients

MENA, MARCELA; MORESCO, ANGELICA; VIDAL, SOFIA; AGUILAR-CORTES, DIANA; OBREGÓN, MARIA GABRIELA; FANDIÑO, ADRIANA; SENDOYA, JUAN M.; LLERA, ANDREA S.; PODHAJCER, OSVALDO L.

Frontiers in Genetics

Frontiers Media

Año: 2021

1664-8021

Purpose: To describe the clinical and molecular spectrum of Stargardt disease (STGD) in a cohort of Argentinean patientsMethods: This retrospective study included 132 subjects comprising 95 probands clinically diagnosed with STGD and relatives from 16 of them. Targeted next-generation sequencing of the coding and splicing regions of ABCA4 and other phenocopying genes (ELOVL4, PROM1, and CNGB3) was performed in 97 STGD patients.Results: We found two or more disease-causing variants in the ABCA4 gene in 69/95 (73%) probands, a single ABCA4 variant in 9/95 (9.5%) probands, and no ABCA4 variants in 17/95 (18%) probands. The final analysis identified 173 variants in ABCA4. Seventy-nine ABCA4 variants were unique, of which nine were novel. No significant findings were seen in the other evaluated genes.Conclusion: This study describes the phenotypic and genetic features of STGD1 in an Argentinean cohort. The mutations p.(Gly1961Glu) and p.(Arg1129Leu) were the most frequent, representing almost 20% of the mutated alleles. We also expanded the ABCA4 mutational spectrum with nine novel disease-causing variants, of which eight might be associated with South American natives.