19-38448712-G-C

Position:

• chr19-38448712-G-C

Variant summary

Our verdict is Pathogenic. Variant got 13 ACMG points: 13P and 0B. PP3_Moderate PP1_Moderate PS3_Moderate PS4_Moderate PS1 PM1_Supporting

This summary comes from the ClinGen Evidence Repository: 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.  LINK:https://erepo.genome.network/evrepo/ui/classification/CA023828/MONDO:0007783/012

• Frequency: Genomes: not found (cov: 31)
• Consequence: RYR1 NM_000540.3 missense
• Clinical Significance: Pathogenic reviewed by expert panel P:1 O:1
• Conservation: PhyloP100: 8.04

Genes affected

RYR1 (HGNC:10483): (ryanodine receptor 1) This gene encodes a ryanodine receptor found in skeletal muscle. The encoded protein functions as a calcium release channel in the sarcoplasmic reticulum but also serves to connect the sarcoplasmic reticulum and transverse tubule. Mutations in this gene are associated with malignant hyperthermia susceptibility, central core disease, and minicore myopathy with external ophthalmoplegia. Alternatively spliced transcripts encoding different isoforms have been described. [provided by RefSeq, Jul 2008]

ACMG classification

Verdict is Pathogenic. Variant got 13 ACMG points.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
RYR1	NM_000540.3	c.1021G>C	p.Gly341Arg	missense_variant	11/106	ENST00000359596.8

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
RYR1	ENST00000359596.8	c.1021G>C	p.Gly341Arg	missense_variant	11/106	5	NM_000540.3	A2
RYR1	ENST00000355481.8	c.1021G>C	p.Gly341Arg	missense_variant	11/105	1		P4
RYR1	ENST00000599547.6	c.1021G>C	p.Gly341Arg	missense_variant, NMD_transcript_variant	11/80	2

Frequencies

GnomAD3 genomes Cov.: 31

GnomAD4 exome Cov.: 31

GnomAD4 genome Cov.: 31

ClinVar

Significance: Pathogenic

Submissions summary: Pathogenic:1 Other:1

Revision: reviewed by expert panel

Submissions by phenotype

Malignant hyperthermia, susceptibility to, 1 Pathogenic:1

Pathogenic, reviewed by expert panel

curation

ClinGen Malignant Hyperthermia Susceptibility Variant Curation Expert Panel, ClinGen

Mar 14, 2022

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, PP1_Moderate, PP3_Moderate. -

not provided Other:1

not provided, no classification provided

literature only

Leiden Muscular Dystrophy (RYR1)

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- -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Pathogenic	0.96
BayesDel_addAF	Pathogenic	0.43	D
BayesDel_noAF	Pathogenic	0.38
CADD	Uncertain	25
DANN	Uncertain	1.0
DEOGEN2	Uncertain	0.78	.;D
Eigen	Uncertain	0.62
Eigen_PC	Uncertain	0.56
FATHMM_MKL	Pathogenic	0.97	D
LIST_S2	Pathogenic	1.0	D;D
M_CAP	Pathogenic	0.50	D
MetaRNN	Pathogenic	0.97	D;D
MetaSVM	Uncertain	0.48	D
MutationAssessor	Uncertain	2.2	M;M
MutationTaster	Benign	1.0	D;D;D
PrimateAI	Uncertain	0.77	T
PROVEAN	Pathogenic	-6.6	D;D
REVEL	Pathogenic	0.88
Sift	Pathogenic	0.0	D;D
Polyphen		1.0	D;D
Vest4		0.77
MutPred		0.87		Loss of sheet (P = 0.0457);Loss of sheet (P = 0.0457);
MVP		0.98
MPC		1.1
ClinPred		1.0	D
GERP RS		3.6
RBP_binding_hub_radar		0.0
RBP_regulation_power_radar		1.7
Varity_R		0.87
gMVP		0.69

Splicing

Name	Calibrated prediction	Score	Prediction
SpliceAI score (max)		0.010		Details are displayed if max score is > 0.2

Find out detailed SpliceAI scores and Pangolin per-transcript scores at spliceailookup.broadinstitute.org

Publications

LitVar

Other links and lift over

dbSNP: rs121918592; hg19: chr19-38939352;