This pathogenicity assessment is relevant only for malignant hyperthermia susceptibility (MHS) inherited in an autosomal dominant pattern. Variants in RYR1 can also cause other myopathies inherited in an autosomal dominant pattern or in an autosomal recessive pattern. Some of these disorders may predispose individuals to malignant hyperthermia. RYR1 variants may also contribute to a malignant hyperthermia reaction in combination with other genetic and non-genetic factors and the clinician needs to consider such factors in making management decisions. This sequence variant predicts a substitution of Glycine with Arginine at codon 341 of the RYR1 protein, p.(Gly341Arg), c.1021G>C. This variant was not present in a large population database (gnomAD) at the time this variant was interpreted. This variant has been reported in five unrelated individuals who have a personal or family history of a malignant hyperthermia reaction, four of these individuals had a positive in vitro contracture test (IVCT) or caffeine halothane contracture test (CHCT) result (if the proband was unavailable for testing, a positive diagnostic test result in a mutation-positive relative was counted), PS4_Moderate (PMID:12059893, PMID:16163667, PMID:30236257 ). This variant segregates with MHS in five individuals/families, PP1_Moderate (PMID:12059893, PMID:12411788). Functional studies in HEK293 cells show an increased sensitivity to RYR1 agonists, PS3_Moderate (PMID:9334205). This variant resides in a region of RYR1 considered to be a hotspot for pathogenic variants that contribute to MHS, use PM1_Supporting to avoid overweighting with PS1 (PMID: 21118704). Another variant has been assessed as pathogenic occurs at this codon, p.(Gly341Arg, c.1021G>A), PS1. This variant segregates with MHS in two individuals (PMID:12059893). A REVEL score >0.85 (0.876) supports a pathogenic status for this variant, PP3_Moderate. This variant has been classified as Pathogenic. Criteria implemented: PS4_Moderate, PS3_Moderate, PM1_Supporting, PS1, PP3_Moderate.