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Turkish Journal of Medical Sciences

Abstract

Background/aim: The aim of the study was to analyze the genotype and phenotype characteristics of Turkish patients with a clinical diagnosis of Stargardt disease and to evaluate how collaboration between the departments of medical genetics and ophthalmology contributes to patient management.

Materials and methods: The clinical findings, genetic testing workflow in the medical genetics department, and the genetic testing results of patients clinically diagnosed with Stargardt disease in the ophthalmology department were retrospectively analyzed.

Results: The study included 50 patients from 46 families. The genetic test reports confirmed the clinical diagnosis of Stargardt disease type 1 (STGD1) in 27 patients (54%), led to revision of the clinical diagnosis in five patients (10%), and were inconclusive in 18 patients (36%). A total of 26 pathogenic ABCA4 variants were reported in 39 patients, three of which were novel: c.466_467dupAT, p.Leu157SerTer2; c.4540-1G>C; c.878delC, p.Met293SerfsTer7. The most recurrent ABCA4 variant was c.5882G>A, p.Gly1961Glu detected in 10 unrelated patients. Patients with biallelic severe ABCA4 variants or biallelic loss of function variants had an earlier age of ascertainment (p = 0.024 and p = 0.008, respectively). The mean interval between the referral of patients from the ophthalmology clinic and the first visit with the medical geneticist was 13.8 days, and the mean time to receive genetic test results with posttest counseling was 6.9 months after the first visit.

Conclusion: This study serves as a representative example of how genetic testing and a multidisciplinary approach can contribute to management of inherited eye diseases. It also reports three novel ABCA4 variants in Turkish patients with Stargardt disease and describes genotype–phenotype correlations. However, conducting multicenter studies with larger sample sizes from Türkiye will be essential to broaden the spectrum of ABCA4 variants and enhance our understanding of genotype–phenotype relationships.

Author ORCID Identifier

FULYA YAYLACIOĞLU TUNCAY: 0000-0002-2088-3416

ŞENGÜL ÖZDEK: 0000-0002-7494-4106

BURAK ACAR: 0000-0003-1312-438X

GÜLSÜM KAYHAN: 0000-0002-4286-243X

MURAT YÜKSEL: 0000-0002-3603-5024

HÜSEYİNHÜSEYİN BARAN ÖZDEMİR: 0000-0002-5585-253X

İHSANİHSAN GÖKHAN GÜRELİK: 0000-0001-9478-494X

MEHMETMEHMET ALİ ERGÜN: 0000-0001-9696-0433

DOI

10.55730/1300-0144.6077

Keywords

ABCA4, genetic testing, inherited eye diseases, multidisciplinary approach, Stargardt disease

First Page

1235

Last Page

1248

Publisher

The Scientific and Technological Research Council of Türkiye (TÜBİTAK)

Creative Commons License

Creative Commons Attribution 4.0 International License
This work is licensed under a Creative Commons Attribution 4.0 International License.

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