ClinVar

Description

This sequence change replaces arginine, which is basic and polar, with glycine, which is neutral and non-polar, at codon 284 of the SGCA protein (p.Arg284Gly). This variant is present in population databases (rs137852623, gnomAD 0.006%). This variant has not been reported in the literature in individuals affected with SGCA-related conditions. ClinVar contains an entry for this variant (Variation ID: 972430). 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 SGCA protein function with a positive predictive value of 95%. This variant disrupts the p.Arg284 amino acid residue in SGCA. Other variant(s) that disrupt this residue have been determined to be pathogenic (PMID: 9192266, 18285821, 18421900, 25135358, 26404900, 26453141). This suggests that this residue is clinically significant, and that variants that disrupt this residue are likely to be disease-causing. 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.