[Molecular genetic diagnosis of Stargardt disease].

N L Sheremet N V Zhorzholadze I A Ronzina I G Grushke S A Kurbatov A L Chukhrova A N Loginova P O Shcherbakova A S Tanas A V Polyakov V V Strel'nikov

Vestn Oftalmol

Research Centre of Medical Genetics, 1 Moskvorech'e St., Moscow, Russia, 115478.

Published: April 2018

The study aimed to compare the effectiveness of genetic screening for Stargardt disease using both a targeted panel for common ABCA4 mutations and comprehensive sequencing of multiple related genes.
In a sample of 54 patients, MLPA analysis confirmed that 50% had one ABCA4 mutation, while massive parallel sequencing showed that 84% of 25 patients had two pathogenic alleles, emphasizing the ABCA4 gene's significance in this condition.
The findings highlight that advanced genetic diagnostics can confirm Stargardt disease in a large majority of patients, with specific mutations like p.L541P, p.A1038V, and p.G1961E being particularly prevalent among those tested.

Aim: To comparatively evaluate the efficacy of genetic screening in patients with Stargardt disease (SD) by using an express panel of 5 most common ABCA4 mutations and performing massive parallel sequencing of all coding regions of the ABCA4, ELOVL4, PROM1, and CNGB3 genes.

Material And Methods: MLPA analysis for 5 ABCA4 mutations, namely p.G863A, p.L541P, p.A1038V, p.G1961E, and p.P1380L, was done in 54 patients with SD. In 25 patients, massive parallel sequencing of coding regions (exons) and neighboring introns of the ABCA4, ELOVL4, PROM1, and CNGB3 genes was also performed.

Results: Gene testing for 5 ABCA4 mutations showed that 50% of patients (27 patients) harbored one mutation and 13% - two mutations. At massive parallel sequencing (25 patients), two pathogenic alleles were found in 21 patients (84%), one mutation - in 23 patients (91.7%). The majority of mutations was accounted for by the ABCA4 gene (83% of all mutation-positive patients).

Conclusion: Sequencing of exons and neighboring introns of the ABCA4, ELOVL4, PROM1, and CNGB3 genes with the new molecular genetic diagnostic system enabled confirmation of the diagnosis of SD in 84% of patients. High prevalence of p.L541P, p.A1038V, and p.G1961E mutations of the ABCA4 gene has been established.

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http://dx.doi.org/10.17116/oftalma201713344-11	DOI Listing

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