The NM_000329.3(RPE65):c.302C>T (p.Thr101Ile) variant is a missense variant in RPE65 causing a substitution of threonine with isoleucine at position 101. This variant is present in gnomAD v.4.1.0 at a Grpmax allele frequency of 8.474e-7, with 1 / 1180026 alleles in the European (Non-Finnish) population, which is lower than the ClinGen LCA/eoRD VCEP PM2_Supporting threshold of <0.0002 (PM2_Supporting). The computational predictor REVEL gives a score of 0.88, which is above the ClinGen LCA/eoRD VCEP threshold of ≥ 0.773 and predicts a damaging effect on RPE65 function (PP3_Moderate). The variant exhibited 1.27% enzymatic activity in a retinoid isomerase assay relative to the wild-type control, which is lower than the ClinGen LCA/eoRD PS3_Supporting threshold of <10% activity, indicating that it triggers a severe defect in protein function (PS3_Supporting, PMID: 19431183). This variant has been reported in at least 1 proband with early-onset severe retinal dystrophy who was compound heterozygous with the c.271C>T p.Arg91Trp variant confirmed in trans by next-generation sequencing data (1 point, VCEP member-provided data), which was previously classified pathogenic by the ClinGen LCA/eoRD VCEP (1 total point, PM3). In summary, this variant meets the criteria to be classified as Likely Pathogenic for RPE65-related recessive retinopathy based on the ACMG/AMP criteria applied, as specified by the ClinGen LCA/eoRD VCEP: PM2_Supporting, PP3_Moderate, PS3_Supporting, PM3 (VCEP specifications version 1.0.0; date of approval 09/21/2023).