ClinVar

Description

This sequence change replaces arginine, which is basic and polar, with histidine, which is basic and polar, at codon 2508 of the RYR1 protein (p.Arg2508His). This variant is present in population databases (rs193922818, gnomAD 0.01%). This missense change has been observed in individual(s) with central core myopathy, King Denborough syndrome, malignant hyperthermia, and/or muscle weakness (PMID: 16621918, 16732084, 16835904, 17483490, 20142353, 21282829, 23558838, 25960145). In at least one individual the variant was observed to be de novo. ClinVar contains an entry for this variant (Variation ID: 133207). 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 RYR1 protein function. Experimental studies have shown that this missense change affects RYR1 function (PMID: 26381711). This variant disrupts the p.Arg2508 amino acid residue in RYR1. Other variant(s) that disrupt this residue have been determined to be pathogenic (PMID: 16621918, 19685112, 26381711). This suggests that this residue is clinically significant, and that variants that disrupt this residue are likely to be disease-causing. For these reasons, this variant has been classified as Pathogenic.