rs118192135

Positions:

• chr19-38572185-G-A

Variant summary

Our verdict is Uncertain significance. Variant got 3 ACMG points: 3P and 0B. PP3_Moderate 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 aspartic acid at codon 4638 of the RYR1 protein, p.(Gly4638Asp). This variant was not present in a large population database (gnomAD) at the time this variant was interpreted.This variant has been reported in one individual with a personal or family history of a malignant hyperthermia reaction. This individual did not have an in vitro contracture test (IVCT) or a caffeine halothane contracture test (CHCT) result, PS4 not implemented (PMID:16732084). No functional studies were identified for this variant. This variant resides in a region of RYR1 considered to be a hotspot for pathogenic variants that contribute to MHS, PM1_Supporting (PMID:21118704). A REVEL score >0.85 (0.917) supports a pathogenic status for this variant, PP3_Moderate. This variant has been classified as a Variant of Unknown Significance. Criteria implemented: PM1_Supporting, PP3_Moderate. LINK:https://erepo.genome.network/evrepo/ui/classification/CA024084/MONDO:0018493/012

• Frequency:
  • Genomes: not found (cov: 32)
  • Exomes 𝑓: 6.8e-7 (0 hom.)
• Consequence: RYR1 NM_000540.3 missense
• Clinical Significance: Uncertain significance reviewed by expert panel P:5 U:1 O:1
• Conservation: PhyloP100: 9.97

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 Uncertain_significance. Variant got 3 ACMG points.

• PM1: For more information check the summary or visit ClinGen Evidence Repository.
• PP3: For more information check the summary or visit ClinGen Evidence Repository.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
RYR1	NM_000540.3	c.13913G>A	p.Gly4638Asp	missense_variant	95/106	ENST00000359596.8	NP_000531.2

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
RYR1	ENST00000359596.8	c.13913G>A	p.Gly4638Asp	missense_variant	95/106	5	NM_000540.3	ENSP00000352608.2

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome AF: 6.84e-7 AC: 1 AN: 1461888 Hom.: 0 Cov.: 33 AF XY: 0.00 AC XY: 0 AN XY: 727246

Gnomad4 AFR exome AF: 0.00

Gnomad4 AMR exome AF: 0.00

Gnomad4 ASJ exome AF: 0.00

Gnomad4 EAS exome AF: 0.00

Gnomad4 SAS exome AF: 0.00

Gnomad4 FIN exome AF: 0.00

Gnomad4 NFE exome AF: 0.00

Gnomad4 OTH exome AF: 0.0000166

GnomAD4 genome Cov.: 32

ClinVar

Significance: Uncertain significance

Submissions summary: Pathogenic:5 Uncertain:1 Other:1

Revision: reviewed by expert panel

Submissions by phenotype

not provided Pathogenic:2 Other:1

not provided, no classification provided	literature only	Leiden Muscular Dystrophy (RYR1)	-	- -
Pathogenic, criteria provided, single submitter	clinical testing	PreventionGenetics, part of Exact Sciences	Nov 22, 2013	- -
Likely pathogenic, criteria provided, single submitter	clinical testing	Revvity Omics, Revvity	Sep 28, 2022	- -

RYR1-related disorder Pathogenic:1

Pathogenic, criteria provided, single submitter

clinical testing

Labcorp Genetics (formerly Invitae), Labcorp

Dec 31, 2022

This variant is not present in population databases (gnomAD no frequency). This sequence change replaces glycine, which is neutral and non-polar, with aspartic acid, which is acidic and polar, at codon 4638 of the RYR1 protein (p.Gly4638Asp). This missense change has been observed in individual(s) with clinical features of autosomal dominant RYR1-related conditions (PMID: 12565913, 14985404, 28357410). For these reasons, this variant has been classified as Pathogenic. This variant disrupts the p.Gly4638Ser amino acid residue in RYR1. Other variant(s) that disrupt this residue have been determined to be pathogenic (PMID: 16621918, 23394784). This suggests that this residue is clinically significant, and that variants that disrupt this residue are likely to be disease-causing. 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. ClinVar contains an entry for this variant (Variation ID: 65941). -

Congenital myopathy with fiber type disproportion Pathogenic:1

Likely pathogenic, criteria provided, single submitter

clinical testing

Centre for Mendelian Genomics, University Medical Centre Ljubljana

Jan 09, 2019

This variant was classified as: Likely pathogenic. The following ACMG criteria were applied in classifying this variant: PM2,PP2,PP3,PS1,PM6. -

Central core myopathy Pathogenic:1

Pathogenic, no assertion criteria provided

curation

GeneReviews

May 11, 2010

- -

Malignant hyperthermia of anesthesia Uncertain:1

Uncertain significance, reviewed by expert panel

curation

ClinGen Malignant Hyperthermia Susceptibility Variant Curation Expert Panel, ClinGen

Apr 06, 2023

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 aspartic acid at codon 4638 of the RYR1 protein, p.(Gly4638Asp). This variant was not present in a large population database (gnomAD) at the time this variant was interpreted. This variant has been reported in one individual with a personal or family history of a malignant hyperthermia reaction. This individual did not have an in vitro contracture test (IVCT) or a caffeine halothane contracture test (CHCT) result, PS4 not implemented (PMID: 16732084). No functional studies were identified for this variant. This variant resides in a region of RYR1 considered to be a hotspot for pathogenic variants that contribute to MHS, PM1_Supporting (PMID: 21118704). A REVEL score >0.85 (0.917) supports a pathogenic status for this variant, PP3_Moderate. This variant has been classified as a Variant of Unknown Significance. Criteria implemented: PM1_Supporting, PP3_Moderate. -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Pathogenic	0.97
BayesDel_addAF	Pathogenic	0.51	D
BayesDel_noAF	Pathogenic	0.49
CADD	Uncertain	23
DANN	Benign	0.95
DEOGEN2	Pathogenic	0.86	.;D
Eigen	Pathogenic	0.87
Eigen_PC	Pathogenic	0.84
FATHMM_MKL	Pathogenic	1.0	D
LIST_S2	Pathogenic	0.98	D;D
M_CAP	Pathogenic	0.64	D
MetaRNN	Pathogenic	0.98	D;D
MetaSVM	Pathogenic	0.90	D
MutationAssessor	Pathogenic	3.1	.;M
PrimateAI	Pathogenic	0.89	D
PROVEAN	Pathogenic	-5.1	D;D
REVEL	Pathogenic	0.92
Sift	Benign	0.19	T;T
Polyphen		1.0	D;D
Vest4		0.79
MutPred		0.93		.;Gain of solvent accessibility (P = 0.039);
MVP		1.0
MPC		0.75
ClinPred		1.0	D
GERP RS		5.2
Varity_R		0.64
gMVP		0.96

Splicing

Name	Calibrated prediction	Score	Prediction
SpliceAI score (max)		0.0		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: rs118192135; hg19: chr19-39062825;