rs118192113

Positions:

• chr19-38442395-C-A

Variant summary

Our verdict is Uncertain significance. Variant got 4 ACMG points: 4P and 0B. PM1 PP3_Moderate

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 serine with tyrosine at codon 71 of the RYR1 protein, p.(Ser71Tyr). This variant was not present in a large population database (gnomAD) at the time this variant was interpreted. This variant has been reported in the literature in individuals with autosomal recessive myopathies. It has also been described in individuals that were noted to be MHS but without a clear history of an MH reaction. These cases did not meet the criteria for PS4 according to the ClinGen RYR1 VCEP for MHS, (PMID:16835904, PMID:16940308, PMID:17365175). Functional studies published for this variant test the variant in trans with other variants and these studies were not considered for PS3/BS3, (PMID:16940308). This variant resides in a region of RYR1 considered to be a hotspot for pathogenic variants that contribute to MHS, PM1 (PMID:21118704). A REVEL score >0.85 (0.937) supports a pathogenic status for this variant, PP3_Moderate. This variant has been classified as a Variant of Unknown Significance. Criteria implemented: PM1, PP3_Moderate. LINK:https://erepo.genome.network/evrepo/ui/classification/CA024333/MONDO:0007783/012

• Frequency: Genomes: not found (cov: 31)
• Consequence: RYR1 NM_000540.3 missense
• Clinical Significance: Uncertain significance reviewed by expert panel P:3 U:3 O:1
• Conservation: PhyloP100: 7.84

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 4 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.212C>A	p.Ser71Tyr	missense_variant	3/106	ENST00000359596.8	NP_000531.2

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
RYR1	ENST00000359596.8	c.212C>A	p.Ser71Tyr	missense_variant	3/106	5	NM_000540.3	ENSP00000352608.2
RYR1	ENST00000355481.8	c.212C>A	p.Ser71Tyr	missense_variant	3/105	1		ENSP00000347667.3
RYR1	ENST00000599547.6	n.212C>A		non_coding_transcript_exon_variant	3/80	2		ENSP00000471601.2

Frequencies

GnomAD3 genomes Cov.: 31

GnomAD4 exome Cov.: 33

GnomAD4 genome Cov.: 31

ClinVar

Significance: Uncertain significance

Submissions summary: Pathogenic:3 Uncertain:3 Other:1

Revision: reviewed by expert panel

Submissions by phenotype

Malignant hyperthermia, susceptibility to, 1 Uncertain:2

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 serine with tyrosine at codon 71 of the RYR1 protein, p.(Ser71Tyr). This variant was not present in a large population database (gnomAD) at the time this variant was interpreted. This variant has been reported in the literature in individuals with autosomal recessive myopathies. It has also been described in individuals that were noted to be MHS but without a clear history of an MH reaction. These cases did not meet the criteria for PS4 according to the ClinGen RYR1 VCEP for MHS, (PMID:16835904, PMID:16940308, PMID:17365175). Functional studies published for this variant test the variant in trans with other variants and these studies were not considered for PS3/BS3, (PMID:16940308). This variant resides in a region of RYR1 considered to be a hotspot for pathogenic variants that contribute to MHS, PM1 (PMID:21118704). A REVEL score >0.85 (0.937) supports a pathogenic status for this variant, PP3_Moderate. This variant has been classified as a Variant of Unknown Significance. Criteria implemented: PM1, PP3_Moderate. -
Uncertain significance, criteria provided, single submitter	clinical testing	All of Us Research Program, National Institutes of Health	Feb 24, 2023	- -

not provided Uncertain:1 Other:1

not provided, no classification provided	literature only	Leiden Muscular Dystrophy (RYR1)	-	- -
Uncertain significance, criteria provided, single submitter	clinical testing	PreventionGenetics, part of Exact Sciences	Jun 22, 2015	- -

RYR1-related disorder Pathogenic:1

Likely pathogenic, criteria provided, single submitter

clinical testing

Labcorp Genetics (formerly Invitae), Labcorp

Mar 24, 2023

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. Experimental studies have shown that this missense change affects RYR1 function (PMID: 16940308). 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) has been performed at Invitae for this missense variant, however the output from this modeling did not meet the statistical confidence thresholds required to predict the impact of this variant on RYR1 protein function. ClinVar contains an entry for this variant (Variation ID: 65993). This missense change has been observed in individual(s) with dominant malignant hyperthermia (PMID: 16835904). This variant has been reported in individual(s) with recessive myopathies (PMID: 16940308, 30611313); however, the role of the variant in this condition is currently unclear. This variant is not present in population databases (gnomAD no frequency). This sequence change replaces serine, which is neutral and polar, with tyrosine, which is neutral and polar, at codon 71 of the RYR1 protein (p.Ser71Tyr). -

RYR1-related myopathy Pathogenic:1

Likely pathogenic, criteria provided, single submitter

research

Muscle and Diseases Team, Institut de Génétique et Biologie Moléculaire et Cellulaire

Mar 01, 2024

- -

Central core myopathy Pathogenic:1

Pathogenic, no assertion criteria provided

curation

GeneReviews

May 11, 2010

- -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Pathogenic	0.93
BayesDel_addAF	Pathogenic	0.52	D
BayesDel_noAF	Pathogenic	0.51
CADD	Uncertain	25
DANN	Benign	0.94
DEOGEN2	Pathogenic	0.91	.;D
Eigen	Uncertain	0.59
Eigen_PC	Uncertain	0.51
FATHMM_MKL	Uncertain	0.96	D
LIST_S2	Pathogenic	0.99	D;D
M_CAP	Pathogenic	0.51	D
MetaRNN	Pathogenic	0.97	D;D
MetaSVM	Pathogenic	1.1	D
MutationAssessor	Uncertain	2.5	M;M
PrimateAI	Pathogenic	0.82	D
PROVEAN	Uncertain	-3.9	D;D
REVEL	Pathogenic	0.94
Sift	Uncertain	0.0010	D;D
Polyphen		1.0	D;D
Vest4		0.71
MutPred		0.90		Loss of sheet (P = 0.0457);Loss of sheet (P = 0.0457);
MVP		0.99
MPC		1.2
ClinPred		0.99	D
GERP RS		3.7
Varity_R		0.62
gMVP		0.76

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: rs118192113; hg19: chr19-38933035;