ClinVar

Description

The c.1364C>A variant in MYOC is a missense variant predicted to cause substitution of Threonine by Lysine at amino acid 455 (p.Thr455Lys). This variant was not found in any population of gnomAD (v2.1.1), meeting the <= 0.0001 threshold set for PM2_Supporting in a population of at least 10,000 alleles. The REVEL score = 0.938, which met the >= 0.7 threshold for PP3, predicting a damaging effect on MYOC function. There was no functional evidence predicting a damaging or benign impact of this variant on MYOC function. 10 segregations in 1 family, with juvenile or primary open angle glaucoma (JOAG or POAG), have been reported (PMID: 18067072), which fulfilled PP1_Moderate (5-6 meioses). Only 1 proband with JOAG had been reported (PMID: 18067072), not meeting the >= 2 probands threshold required to meet PS4_Supporting. In summary, this variant met the criteria to receive a score of 4 and to be classified as a variant of uncertain significance (uncertain significance classification range -1 to 5) for juvenile open angle glaucoma based on the ACMG/AMP criteria met, as specified by the ClinGen Glaucoma VCEP (v1, 12 Oct 2021): PP1_Moderate, PP3, PM2_Supporting.