The NM_000350.3(ABCA4):c.3386G>T variant in ABCA4 is a missense variant predicted to cause substitution of arginine by leucine at amino acid 1129 (p.Arg1129Leu). The computational predictor REVEL gives a score of 0.848 which is above the threshold of >0.772, evidence that predicts a damaging effect on ABCA4 function (PP3_Moderate). The prevalence of the variant in affected individuals is significantly increased compared with the prevalence in controls. The OR is 82.6 and the CI is 57.49 to 122.45, which is above the ABCA4 VCEP threshold of >5, where the CI does not contain 1 (PS4; PMID: 35120629). This variant is reported to be a founder variant in Spanish patients with ABCA4-related retinopathy, accounting for 24% of the disease-associated alleles in the cohort (PMID: 16917483). Of those individuals, five were compound heterozygous for the variant and a pathogenic or likely pathogenic variant and two of those were confirmed in trans by parental testing. Five individuals were homozygous for the variant (PM3_Strong, PMID:16917483). In summary, this variant meets the criteria to be classified as pathogenic for ABCA4-related retinopathy based on the ACMG/AMP criteria applied, as specified by the ClinGen ABCA4 VCEP (Specification Version 1.0): PM3_Strong, PS4, PP3_Moderate.