Correlation between photoreceptor layer integrity and visual function in patients with Stargardt disease:...

Area of Science:

• Ophthalmology
• Genetics
• Retinal Diseases

Background:

• Stargardt disease (STGD) is an inherited macular dystrophy characterized by progressive vision loss.
• Mutations in the ABCA4 gene are a primary cause of STGD.
• Understanding the clinical manifestations and genotype-phenotype correlations is essential for patient management and therapeutic development.

Purpose of the Study:

• To clinically characterize Stargardt disease patients with ABCA4 gene mutations.
• To investigate the correlation between inner-outer segment (IS/OS) junction morphology and key visual parameters.
• To assess the relationship between IS/OS junction integrity and disease severity markers.

Main Methods:

• Comprehensive ophthalmic examinations were performed on 61 STGD patients.
• Spectral-domain optical coherence tomography (SD-OCT) was used to evaluate IS/OS junction morphology.
• Correlations were analyzed between IS/OS morphology, visual acuity, fundus lesions, electroretinography (ERG), and macular sensitivity. ABCA4 gene sequencing was conducted.

Main Results:

• Significant differences in visual acuity and microperimetry sensitivity were found across different IS/OS junction morphology groups.
• IS/OS abnormalities correlated significantly with the extent of fundus lesions and ERG/multifocal ERG results.
• The G1961E mutation was associated with a milder STGD phenotype, showing less extensive IS/OS junction loss.

Conclusions:

• IS/OS junction morphology is a sensitive indicator of visual function and disease severity in STGD patients.
• A comprehensive examination approach, including IS/OS junction assessment, can improve understanding of vision loss in STGD.
• This approach may serve as a valuable tool for evaluating the efficacy of future STGD therapies.