rs111272095

Positions:

• chr19-38466347-C-T

Variant summary

Our verdict is Uncertain significance. Variant got 2 ACMG points: 2P and 0B. 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 arginine with cysteine at codon 1043 of the RYR1 protein, p.Arg1043Cys. This variant has been reported in an individual with a personal or family history of an MH episode and 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), however, this individual also had a second RYR1 variant classified as pathogenic p.Arg2336His (PMID:19191329). Both the presence of a pathogenic RYR1 variant and the high MAF in the AMR population in gnomAD preclude the use of PS4. No functional studies were identified for this variant. A REVEL score >0.85 (0.936) supports a pathogenic status for this variant, PP3_Moderate. This variant has been classified as a Variant of Unknown Significance. Criteria implemented: PP3_Moderate. LINK:https://erepo.genome.network/evrepo/ui/classification/CA024388/MONDO:0007783/012

• Frequency:
  • Genomes: 𝑓 0.000020 (0 hom., cov: 31)
  • Exomes 𝑓: 0.0000069 (0 hom.)
• Consequence: RYR1 NM_000540.3 missense
• Clinical Significance: Uncertain significance reviewed by expert panel U:8 B:1 O:1
• Conservation: PhyloP100: 4.12

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]

RYR1 (HGNC:):

ACMG classification

Verdict is Uncertain_significance. Variant got 2 ACMG points.

• 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.3127C>T	p.Arg1043Cys	missense_variant	24/106	ENST00000359596.8	NP_000531.2

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
RYR1	ENST00000359596.8	c.3127C>T	p.Arg1043Cys	missense_variant	24/106	5	NM_000540.3	ENSP00000352608.2
RYR1	ENST00000355481.8	c.3127C>T	p.Arg1043Cys	missense_variant	24/105	1		ENSP00000347667.3
RYR1	ENST00000594111.1	n.220C>T		non_coding_transcript_exon_variant	1/2	2
RYR1	ENST00000599547.6	n.3127C>T		non_coding_transcript_exon_variant	24/80	2		ENSP00000471601.2

Frequencies

GnomAD3 genomes AF: 0.0000197 AC: 3 AN: 152168 Hom.: 0 Cov.: 31

Gnomad AFR AF: 0.0000241

Gnomad AMI AF: 0.00

Gnomad AMR AF: 0.00

Gnomad ASJ AF: 0.000288

Gnomad EAS AF: 0.00

Gnomad SAS AF: 0.00

Gnomad FIN AF: 0.00

Gnomad MID AF: 0.00

Gnomad NFE AF: 0.0000147

Gnomad OTH AF: 0.00

GnomAD3 exomes AF: 0.0000295 AC: 6 AN: 203518 Hom.: 0 AF XY: 0.0000452 AC XY: 5 AN XY: 110508

Gnomad AFR exome AF: 0.00

Gnomad AMR exome AF: 0.000100

Gnomad ASJ exome AF: 0.00

Gnomad EAS exome AF: 0.00

Gnomad SAS exome AF: 0.00

Gnomad FIN exome AF: 0.00

Gnomad NFE exome AF: 0.0000338

Gnomad OTH exome AF: 0.00

GnomAD4 exome AF: 0.00000695 AC: 10 AN: 1439426 Hom.: 0 Cov.: 38 AF XY: 0.00000700 AC XY: 5 AN XY: 714780

Gnomad4 AFR exome AF: 0.00

Gnomad4 AMR exome AF: 0.0000722

Gnomad4 ASJ exome AF: 0.00

Gnomad4 EAS exome AF: 0.00

Gnomad4 SAS exome AF: 0.0000120

Gnomad4 FIN exome AF: 0.0000200

Gnomad4 NFE exome AF: 0.00000453

Gnomad4 OTH exome AF: 0.00

GnomAD4 genome AF: 0.0000197 AC: 3 AN: 152168 Hom.: 0 Cov.: 31 AF XY: 0.0000269 AC XY: 2 AN XY: 74332

Gnomad4 AFR AF: 0.0000241

Gnomad4 AMR AF: 0.00

Gnomad4 ASJ AF: 0.000288

Gnomad4 EAS AF: 0.00

Gnomad4 SAS AF: 0.00

Gnomad4 FIN AF: 0.00

Gnomad4 NFE AF: 0.0000147

Gnomad4 OTH AF: 0.00

Bravo AF: 0.0000340

ESP6500AA AF: 0.00 AC: 0

ESP6500EA AF: 0.000117 AC: 1

ExAC AF: 0.00000829 AC: 1

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:8 Benign:1 Other:1

Revision: reviewed by expert panel

Submissions by phenotype

Malignant hyperthermia, susceptibility to, 1 Uncertain:3 Benign:1

Uncertain significance, criteria provided, single submitter	clinical testing	All of Us Research Program, National Institutes of Health	May 30, 2024	This missense variant replaces arginine with cysteine at codon 1043 of the RYR1 protein. Computational prediction suggests that this variant may have deleterious impact on protein structure and function (internally defined REVEL score threshold >= 0.7, PMID: 27666373). To our knowledge, functional studies have not been reported for this variant. This variant has been reported in two families/individuals affected with malignant hyperthermia susceptibility, these individuals also carried a known pathogenic variant in the RYR1 gene that could explain the observed phenotype (PMID: 19191329, 23558838). This variant has been identified in 6/203518 chromosomes in the general population by the Genome Aggregation Database (gnomAD). The available evidence is insufficient to determine the role of this variant in disease conclusively. Therefore, this variant is classified as a Variant of Uncertain Significance. -
Likely benign, no assertion criteria provided	research	CSER _CC_NCGL, University of Washington	Jun 01, 2014	- -
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 arginine with cysteine at codon 1043 of the RYR1 protein, p.Arg1043Cys. This variant has been reported in an individual with a personal or family history of an MH episode and 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), however, this individual also had a second RYR1 variant classified as pathogenic p.Arg2336His (PMID:19191329). Both the presence of a pathogenic RYR1 variant and the high MAF in the AMR population in gnomAD preclude the use of PS4. No functional studies were identified for this variant. A REVEL score >0.85 (0.936) supports a pathogenic status for this variant, PP3_Moderate. This variant has been classified as a Variant of Unknown Significance. Criteria implemented: PP3_Moderate. -
Uncertain significance, criteria provided, single submitter	clinical testing	Mendelics	Jun 02, 2023	- -

not provided Uncertain:2 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	Nov 19, 2013	- -
Uncertain significance, criteria provided, single submitter	clinical testing	Eurofins Ntd Llc (ga)	Jul 11, 2014	- -

not specified Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Women's Health and Genetics/Laboratory Corporation of America, LabCorp

Jan 19, 2022

Variant summary: RYR1 c.3127C>T (p.Arg1043Cys) results in a non-conservative amino acid change located in the Ryanodine receptor Ryr domain (IPR003032) of the encoded protein sequence. Five of five in-silico tools predict a damaging effect of the variant on protein function. The variant allele was found at a frequency of 2.9e-05 in 203518 control chromosomes (gnomAD). The available data on variant occurrences in the general population are insufficient to allow any conclusion about variant significance. c.3127C>T has been reported in the literature in individuals affected with Malignant Hyperthermia Susceptibility and other RYR1-related myopathy, however it was shown co-occuring with other RYR1 pathogenic variants: c.7007G>A, p.Arg2336His (ClinVar:133174, pathogenic) (Levano_2009, Brandom_2013, Kushnir_2020, internal testing) or c.1589G>A, p.Arg530His (ClinVar:133101, VUS/likely pathogenic/pathogenic)(Herman_2021, Kushnir_2020), providing supporting evidence for a benign role. To our knowledge, no experimental evidence demonstrating an impact on protein function has been reported. Three ClinVar submitters, including one expert panel, have assessed this variant since 2014: two have classified the variant as of uncertain significance and one as benign. Based on the evidence outlined above, the variant was classified as uncertain significance. -

RYR1-related disorder Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Labcorp Genetics (formerly Invitae), Labcorp

Jul 19, 2022

This sequence change replaces arginine, which is basic and polar, with cysteine, which is neutral and slightly polar, at codon 1043 of the RYR1 protein (p.Arg1043Cys). The frequency data for this variant in the population databases is considered unreliable, as metrics indicate poor data quality at this position in the gnomAD database. This missense change has been observed to co-occur in individuals with a different variant in RYR1 that has been determined to be pathogenic (PMID: 19191329, 23558838, 30155738), but the significance of this finding is unclear. ClinVar contains an entry for this variant (Variation ID: 133124). 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. In summary, the available evidence is currently insufficient to determine the role of this variant in disease. Therefore, it has been classified as a Variant of Uncertain Significance. -

Congenital myopathy with fiber type disproportion;C1840365:King Denborough syndrome;C1850674:Congenital multicore myopathy with external ophthalmoplegia;C2930980:Malignant hyperthermia, susceptibility to, 1;C5830701:Central core myopathy Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Fulgent Genetics, Fulgent Genetics

Feb 08, 2022

- -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Pathogenic	0.67
BayesDel_addAF	Pathogenic	0.42	D
BayesDel_noAF	Pathogenic	0.37
CADD	Pathogenic	29
DANN	Uncertain	1.0
DEOGEN2	Pathogenic	0.81	.;D
Eigen	Uncertain	0.54
Eigen_PC	Uncertain	0.42
FATHMM_MKL	Uncertain	0.91	D
LIST_S2	Pathogenic	0.99	D;D
M_CAP	Pathogenic	0.77	D
MetaRNN	Pathogenic	0.94	D;D
MetaSVM	Pathogenic	0.87	D
MutationAssessor	Uncertain	2.4	M;M
PrimateAI	Pathogenic	0.90	D
PROVEAN	Pathogenic	-5.8	D;D
REVEL	Pathogenic	0.94
Sift	Uncertain	0.025	D;D
Polyphen		1.0	D;D
Vest4		0.85
MVP		0.99
MPC		0.98
ClinPred		0.92	D
GERP RS		2.9
Varity_R		0.43
gMVP		0.74

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: rs111272095; hg19: chr19-38956987; COSMIC: COSV62110706;