NM_001034853.2(RPGR):c.2236_2237del (p.Glu746ArgfsTer23) is a frameshift variant that introduces a premature stop codon into exon 15 of 15 before amino acid 1132, which is predicted not to trigger nonsense-mediated decay but rather to disrupt a critical C-terminal region required for proper glutamylation of RPGR (PVS1, PMID: 36445968). This variant is absent from hemizygous individuals in gnomAD v4.1.0 (PM2_supporting). At least one proband harboring this variant exhibits a phenotype including family history consistent with X-linked inheritance (2 pts), with delayed or milder phenotype in females (1 pt), and rod involvement greater than cone (1 pt), which together are specific for RPGR-related retinopathy (4 points, PP4). This variant has been reported in at least 33 apparently unrelated probands meeting the PS4 requirement of some functional vision impairment in affected males by age 30 years, or decreased / absent cone and/or rod electroretinogram responses (PMIDs: 20021257, 11950860, 16086276, 17093403, 34745198, 33247286, 33576794, 33090715, 23681342, 31213501, 22807293, 32531858, PS4). The variant has been reported to segregate with retinal dystrophy through at least 4 affected meioses from at least 2 families (PP1_strong; PMID: 21857984, 20021257, 11950860, 16086276, 17093403, 34745198). In summary, this variant is classified as pathogenic for RPGR-related retinopathy based on the ClinGen X-linked Inherited Retinal Disease Expert Panel Specifications to the ACMG/AMP Variant Interpretation Guidelines for RPGR Version 1.0.0; PVS1, PS4, PM2_supporting, PP1_strong, and PP4. (date of approval 05/16/2025).