ClinVar Miner

Submissions for variant NM_000089.4(COL1A2):c.973G>C (p.Gly325Arg)

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Total submissions: 2
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Submitter RCV SCV Clinical significance Condition Last evaluated Review status Method Comment
Revvity Omics, Revvity RCV003141651 SCV003827477 likely pathogenic not provided 2023-01-19 criteria provided, single submitter clinical testing
Labcorp Genetics (formerly Invitae), Labcorp RCV003778824 SCV004592725 likely pathogenic Osteogenesis imperfecta type I; Ehlers-Danlos syndrome, classic type, 1 2023-03-26 criteria provided, single submitter clinical testing In summary, the currently available evidence indicates that the variant is pathogenic, but additional data are needed to prove that conclusively. Therefore, this variant has been classified as Likely Pathogenic. This variant disrupts the p.Gly325 amino acid residue in COL1A2. Other variant(s) that disrupt this residue have been observed in individuals with COL1A2-related conditions (PMID: 16705691; Invitae), which suggests that this may be a clinically significant amino acid residue. This variant disrupts the triple helix domain of COL1A2. Glycine residues within the Gly-Xaa-Yaa repeats of the triple helix domain are required for the structure and stability of fibrillar collagens (PMID: 7695699, 8218237, 19344236). In COL1A2, variants affecting these glycine residues are significantly enriched in individuals with disease (PMID: 9016532, 17078022) compared to the general population (ExAC). Advanced modeling of protein sequence and biophysical properties (such as structural, functional, and spatial information, amino acid conservation, physicochemical variation, residue mobility, and thermodynamic stability) performed at Invitae indicates that this missense variant is expected to disrupt COL1A2 protein function. ClinVar contains an entry for this variant (Variation ID: 2439316). This variant has not been reported in the literature in individuals affected with COL1A2-related conditions. This variant is not present in population databases (gnomAD no frequency). This sequence change replaces glycine, which is neutral and non-polar, with arginine, which is basic and polar, at codon 325 of the COL1A2 protein (p.Gly325Arg).

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