Description
The c.754G>A variant in MYOC is a missense variant predicted to cause substitution of Glycine by Arginine at amino acid 252 (p.Gly252Arg). 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 = 0.798, which met the >= 0.7 threshold for PP3, predicting a damaging effect on MYOC function. A previous study (PMID: 16466712) demonstrated that the Gly252Arg protein had reduced secretion levels compared to wild type myocilin protein and met the OddsPath threshold for PS3_Moderate (> 4.3), indicating that this variant did impact protein function. 17 segregations in 3 families, with juvenile or primary open angle glaucoma (JOAG or POAG), have been reported (PMIDs: 17210859, 10873982, 15326130), which fulfilled PP1_Strong (>= 7 meioses in > 1 family). 4 probands with JOAG or POAG have been reported carrying this variant (PMIDs: 17210859, 10873982, 9772276, 15326130), which met PS4_Supporting (>= 2 probands). In summary, this variant met the criteria to receive a score of 9 and to be classified as likely pathogenic (likely pathogenic classification range 6 to 9) for juvenile open angle glaucoma based on the ACMG/AMP criteria met, as specified by the ClinGen Glaucoma VCEP (v1, 12 Oct 2021): PP1_Strong, PS3_Moderate, PP3, PM2_Supporting, PS4_Supporting.
# | Sample | Method | Observation |
---|
Origin | Affected | Number tested | Tissue | Purpose | Method | Individuals | Allele frequency | Families | Co-occurrences |
---|
1 | germline | unknown | not provided | not provided | not provided | | not provided | not provided | not provided | not provided |