19-38483293-A-G

Variant names:

• chr19-38483293-A-G
• rs146429605
• NM_000540.3:c.4711A>G

Variant summary

Our verdict is Likely benign. The variant received -4 ACMG points: 0P and 4B. BS1

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 Isoleucine with Valine at codon 1571 of the RYR1 protein, p.(Ile1571Val). The maximum allele frequency for this variant among the six major gnomAD populations is NFE: 0.0014, this is considered to be more common than expected for a pathogenic variant causing autosomal dominantly inherited MHS, BS1. This variant has been reported in five unrelated individuals who have a personal or family history of a malignant hyperthermia reaction, all 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), (PMID:25958340, PMID:20681998, PMID:25658027, PMID:25735680). However, the high MAF in the NFE population in gnomAD precludes the use of PS4. No functional studies were identified for this variant. This variant does not reside in a hotspot for pathogenic variants that contribute to MHS. A REVEL score of 0.56 supports neither a pathogenic nor a benign status for this variant. Based on using Bayes to combine criteria this variant is assessed as Likely Benign, (PMID:29300386). Criteria implemented: BS1.  LINK:https://erepo.genome.network/evrepo/ui/classification/CA024455/MONDO:0007783/012

• Frequency:
  • Genomes: 𝑓 0.0011 (1 hom., cov: 31)
  • Exomes 𝑓: 0.0012 (3 hom.)
• Consequence: RYR1 NM_000540.3 missense
• Clinical Significance: Likely benign reviewed by expert panel P:1 U:16 B:8
• Conservation: PhyloP100: 2.60
• Publications: 18 publications found

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 Gene-Disease associations (from GenCC):

• malignant hyperthermia, susceptibility to, 1

  Inheritance: AD Classification: DEFINITIVE, STRONG Submitted by: Labcorp Genetics (formerly Invitae), ClinGen, Genomics England PanelApp, Ambry Genetics
• congenital multicore myopathy with external ophthalmoplegia

  Inheritance: AR Classification: DEFINITIVE, STRONG Submitted by: G2P, Genomics England PanelApp
• RYR1-related myopathy

  Inheritance: AR, AD Classification: DEFINITIVE Submitted by: ClinGen
• central core myopathy

  Inheritance: AD, AR Classification: STRONG, SUPPORTIVE Submitted by: Labcorp Genetics (formerly Invitae), Orphanet, Genomics England PanelApp
• King-Denborough syndrome

  Inheritance: AD Classification: SUPPORTIVE Submitted by: Orphanet
• malignant hyperthermia of anesthesia

  Inheritance: AD Classification: SUPPORTIVE Submitted by: Orphanet
• autosomal recessive centronuclear myopathy

  Inheritance: AR Classification: SUPPORTIVE Submitted by: Orphanet
• benign Samaritan congenital myopathy

  Inheritance: AR Classification: SUPPORTIVE Submitted by: Orphanet
• congenital myopathy with myasthenic-like onset

  Inheritance: AR Classification: SUPPORTIVE Submitted by: Orphanet
• lethal multiple pterygium syndrome

  Inheritance: AR Classification: SUPPORTIVE Submitted by: Orphanet

ACMG classification

Our verdict: Likely_benign. The variant received -4 ACMG points.

• BS1: For more information check the summary or visit ClinGen Evidence Repository.

Variant Effect in Transcripts

ACMG analysis was done for transcript: NM_000540.3. You can select a different transcript below to see updated ACMG assignments.

RefSeq Transcripts

Selected	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	RYR1	NM_000540.3	MANE Select	c.4711A>G	p.Ile1571Val	missense	Exon 33 of 106	NP_000531.2
	RYR1	NM_001042723.2		c.4711A>G	p.Ile1571Val	missense	Exon 33 of 105	NP_001036188.1

Ensembl Transcripts

Selected	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	RYR1	ENST00000359596.8	TSL:5 MANE Select	c.4711A>G	p.Ile1571Val	missense	Exon 33 of 106	ENSP00000352608.2
	RYR1	ENST00000355481.8	TSL:1	c.4711A>G	p.Ile1571Val	missense	Exon 33 of 105	ENSP00000347667.3
	RYR1	ENST00000594335.6	TSL:1	n.4711A>G		non_coding_transcript_exon	Exon 33 of 103	ENSP00000470927.2

Frequencies

GnomAD3 genomes AF: 0.00109 AC: 166 AN: 152128 Hom.: 1 Cov.: 31

Gnomad AFR AF: 0.0000966

Gnomad AMI AF: 0.00

Gnomad AMR AF: 0.00268

Gnomad ASJ AF: 0.00144

Gnomad EAS AF: 0.00

Gnomad SAS AF: 0.000828

Gnomad FIN AF: 0.00

Gnomad MID AF: 0.00

Gnomad NFE AF: 0.00162

Gnomad OTH AF: 0.000955

GnomAD2 exomes AF: 0.000895 AC: 150 AN: 167524 AF XY: 0.000934

Gnomad AFR exome AF: 0.000102

Gnomad AMR exome AF: 0.00102

Gnomad ASJ exome AF: 0.000575

Gnomad EAS exome AF: 0.00

Gnomad FIN exome AF: 0.00

Gnomad NFE exome AF: 0.00146

Gnomad OTH exome AF: 0.000642

GnomAD4 exome AF: 0.00121 AC: 1705 AN: 1408196 Hom.: 3 Cov.: 32 AF XY: 0.00125 AC XY: 869 AN XY: 695748

African (AFR) AF: 0.0000929 AC: 3 AN: 32306

American (AMR) AF: 0.00102 AC: 37 AN: 36308

Ashkenazi Jewish (ASJ) AF: 0.000554 AC: 14 AN: 25268

East Asian (EAS) AF: 0.00 AC: 0 AN: 36874

South Asian (SAS) AF: 0.000584 AC: 47 AN: 80466

European-Finnish (FIN) AF: 0.0000207 AC: 1 AN: 48372

Middle Eastern (MID) AF: 0.00176 AC: 10 AN: 5686

European-Non Finnish (NFE) AF: 0.00142 AC: 1540 AN: 1084496

Other (OTH) AF: 0.000907 AC: 53 AN: 58420

GnomAD4 genome AF: 0.00109 AC: 166 AN: 152246 Hom.: 1 Cov.: 31 AF XY: 0.00109 AC XY: 81 AN XY: 74440

African (AFR) AF: 0.0000963 AC: 4 AN: 41548

American (AMR) AF: 0.00268 AC: 41 AN: 15296

Ashkenazi Jewish (ASJ) AF: 0.00144 AC: 5 AN: 3470

East Asian (EAS) AF: 0.00 AC: 0 AN: 5180

South Asian (SAS) AF: 0.000829 AC: 4 AN: 4828

European-Finnish (FIN) AF: 0.00 AC: 0 AN: 10610

Middle Eastern (MID) AF: 0.00 AC: 0 AN: 294

European-Non Finnish (NFE) AF: 0.00162 AC: 110 AN: 67992

Other (OTH) AF: 0.000945 AC: 2 AN: 2116

Alfa AF: 0.00138 Hom.: 1

Bravo AF: 0.00105

ESP6500AA AF: 0.000229 AC: 1

ESP6500EA AF: 0.00129 AC: 11

ExAC AF: 0.000603 AC: 71

Asia WGS AF: 0.000289 AC: 1 AN: 3478

ClinVar

Significance: Likely benign

Submissions summary: Pathogenic:1 Uncertain:16 Benign:8

Revision: reviewed by expert panel

Submissions by phenotype

not provided Uncertain:6 Benign:2

Feb 15, 2018

Eurofins Ntd Llc (ga)

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

Aug 15, 2016

PreventionGenetics, part of Exact Sciences

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

Apr 29, 2014

Genetic Services Laboratory, University of Chicago

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

Sep 01, 2025

CeGaT Center for Human Genetics Tuebingen

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

RYR1: PM3:Strong, PM2:Supporting, PP3, BS2

Feb 12, 2020

Mayo Clinic Laboratories, Mayo Clinic

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

Breakthrough Genomics, Breakthrough Genomics

Significance: Likely benign

Review Status: criteria provided, single submitter

Collection Method: not provided

Mar 25, 2021

GeneDx

Significance: Likely benign

Review Status: criteria provided, single submitter

Collection Method: clinical testing

In silico analysis supports that this missense variant does not alter protein structure/function; This variant is associated with the following publications: (PMID: 30611313, 28259615, 28269792, 20681998, 25214167, 25958340, 23919265, 25735680, 24950660, 25960145, 25637381, 24055113, 22473935, 26332594, 31517061)

Dec 15, 2024

Revvity Omics, Revvity

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

Malignant hyperthermia, susceptibility to, 1 Uncertain:1 Benign:5

Jun 01, 2014

CSER _CC_NCGL, University of Washington

Significance: Likely benign

Review Status: no assertion criteria provided

Collection Method: research

Jul 27, 2022

MGZ Medical Genetics Center

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

Sep 27, 2024

All of Us Research Program, National Institutes of Health

Significance: Likely benign

Review Status: criteria provided, single submitter

Collection Method: clinical testing

Mar 18, 2021

ClinGen Malignant Hyperthermia Susceptibility Variant Curation Expert Panel, ClinGen

Significance: Likely benign

Review Status: reviewed by expert panel

Collection Method: curation

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 Isoleucine with Valine at codon 1571 of the RYR1 protein, p.(Ile1571Val). The maximum allele frequency for this variant among the six major gnomAD populations is NFE: 0.0014, this is considered to be more common than expected for a pathogenic variant causing autosomal dominantly inherited MHS, BS1. This variant has been reported in five unrelated individuals who have a personal or family history of a malignant hyperthermia reaction, all 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), (PMID:25958340, PMID:20681998, PMID:25658027, PMID:25735680). However, the high MAF in the NFE population in gnomAD precludes the use of PS4. No functional studies were identified for this variant. This variant does not reside in a hotspot for pathogenic variants that contribute to MHS. A REVEL score of 0.56 supports neither a pathogenic nor a benign status for this variant. Based on using Bayes to combine criteria this variant is assessed as Likely Benign, (PMID: 29300386). Criteria implemented: BS1.

May 28, 2019

Mendelics

Significance: Benign

Review Status: criteria provided, single submitter

Collection Method: clinical testing

Mar 01, 2023

Color Diagnostics, LLC DBA Color Health

Significance: Likely benign

Review Status: criteria provided, single submitter

Collection Method: clinical testing

not specified Uncertain:2 Benign:1

Feb 16, 2025

Laboratory of Genetics, Children's Clinical University Hospital Latvia

Significance: Likely benign

Review Status: criteria provided, single submitter

Collection Method: clinical testing

Apr 25, 2016

Laboratory for Molecular Medicine, Mass General Brigham Personalized Medicine

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

Variant identified in a genome or exome case(s) and assessed due to predicted null impact of the variant or pathogenic assertions in the literature or databases. Disclaimer: This variant has not undergone full assessment. The following are preliminary notes: 2 papers describe as LB; ExAC: 0.5% (3/608) Latino chromosomes; ClinVar: 1 LB, 1 VUS; ML: Frequent for disease. 0.2% Eur

May 05, 2025

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

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

Variant summary: RYR1 c.4711A>G (p.Ile1571Val) results in a conservative amino acid change in the encoded protein sequence. Algorithms developed to predict the effect of missense changes on protein structure and function are either unavailable or do not agree on the potential impact of this missense change. The variant allele was found at a frequency of 0.0009 in 167524 control chromosomes. This frequency is not significantly higher than estimated for a pathogenic variant in RYR1 causing Myopathy, RYR1-Associated, allowing no conclusion about variant significance. c.4711A>G has been reported in the literature in cis with c.10097G>A and c.11798A>G in individuals affected with RYR1-Associated Myopathy (malignant hyperthermia (MH), congenital myopathy, central core disease (CCD), and multi minicore disease (MmD) (examples: Rocha_2014, Savarese_2014, Fiszer_2015, Snoeck_2015, Gillies_2015, Kraeva_2015, Garibaldi_2019, Granger_ 2023, Sarkozy_2023)). It is unclear if one of the three variants or the combined effect of these mutations are causative for the RYR1-associated diseases in reported individuals. To our knowledge, no experimental evidence demonstrating an impact on protein function has been reported. The following publications have been ascertained in the context of this evaluation (PMID: 25658027, 30611313, 25735680, 36628841, 25958340, 24950660, 37643885, 25214167, 25960145). ClinVar contains an entry for this variant (Variation ID: 159851). Based on the evidence outlined above, the variant was classified as uncertain significance.

Central core myopathy Pathogenic:1 Uncertain:1

Oct 09, 2023

Zotz-Klimas Genetics Lab, MVZ Zotz Klimas

Significance: Uncertain significance

Review Status: no assertion criteria provided

Collection Method: clinical testing

Oct 01, 2021

Laboratory of Medical Genetics, National & Kapodistrian University of Athens

Significance: Likely pathogenic

Review Status: criteria provided, single submitter

Collection Method: clinical testing

PM1, PM2, PM3, PP2, PP4, PP5

RYR1-related disorder Uncertain:2

Jan 31, 2024

Labcorp Genetics (formerly Invitae), Labcorp

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

This sequence change replaces isoleucine, which is neutral and non-polar, with valine, which is neutral and non-polar, at codon 1571 of the RYR1 protein (p.Ile1571Val). This variant is present in population databases (rs146429605, gnomAD 0.1%), and has an allele count higher than expected for a pathogenic variant. Three missense variants, p.Ile1571Val, p.Arg3366His, and p.Tyr3933Cys, which includes this variant (p.Ile1571Val), have been reported together in multiple individuals and families affected with RYR1-related disorders including malignant hyperthermia (MH) syndrome, congenital myopathy, central core disease (CCD), and multi minicore disease (MmD). In some cases, the phase of the three variants along with additional RYR1 variants was established, while in other cases it could not be determined. It is therefore unclear if one of the three variants or the additive effect of some or all of these mutations are causative for the RYR1-associated diseases in reported individuals (PMID: 25958340, 25735680, 25214167, 24950660, 25960145, 25658027, 22473935, 20681998, 28259615, 30611313). ClinVar contains an entry for this variant (Variation ID: 159851). 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 not expected to disrupt RYR1 protein function with a negative predictive value of 95%. 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.

Feb 28, 2023

Undiagnosed Diseases Network, NIH

Significance: Uncertain significance

Review Status: no assertion criteria provided

Collection Method: clinical testing

Anterior segment dysgenesis 7 Uncertain:1

Apr 11, 2023

Molecular Genetics, Royal Melbourne Hospital

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

This sequence change in RYR1 is predicted to replace isoleucine with valine at codon 1571, p.(Ile1571Val). The isoleucine residue is moderately conserved (100 vertebrates, UCSC), and is located in exon 33. There is a small physicochemical difference between isoleucine and valine. The highest population minor allele frequency in the population database gnomAD v2.1 is 0.14% (114/83,130 alleles) in the European (non-Finnish) population. This variant is almost always reported in a haplotype with two other RYR1 missense variants, p.[(Ile1571Val);(Arg3366His);(Tyr3933Cys)]. The haplotype has been detected in at least 19 individuals with a phenotype consistent with RYR1-related myopathy with/without malignant hyperthermia susceptibility (MHS). Of those individuals, 14 were compound heterozygous for the variant and a pathogenic or likely pathogenic variant and 8 of those were confirmed in trans by parental/family testing (PMID: 22473935, 23394784, 24950660, 25958340, 25960145, 30611313, 32236737, 35428369). The haplotype segregates with myopathy in a recessive mode of inheritance in at least one family, and there is conflicting evidence for segregation with MHS (PMID: 22473935, 23394784, 25958340). There is limited evidence that the monoallelic haplotype is associated with RYR1-related disease, it has been detected in individuals that unaffected, with MHS, and symptomatic hyperCKaemia (PMID: 25958340, 28259615, 31517061, 32236737). The variant has been detected alone in at least 2 individuals with muscle-related phenotypes, one was compound heterozygous with a pathogenic variant (PMID: 29701772, 35428369). Multiple lines of computational evidence have conflicting predictions for the missense substitution (2/5 algorithms predict deleterious). Based on the classification scheme RMH Modified ACMG Guidelines v1.5.1, this variant is classified as a VARIANT OF UNCERTAIN SIGNIFICANCE. Following criteria are met: PM3_Supporting. The haplotype is classified as LIKELY PATHOGENIC. Following criteria are met: PM3_VeryStrong, PP1.

RYR1-related myopathy Uncertain:1

Oct 19, 2020

Victorian Clinical Genetics Services, Murdoch Childrens Research Institute

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

Based on the classification scheme VCGS_Germline_v1.1.1, this variant is classified as a VUS. Following criteria are met: 0103 - Both loss- and gain-of-function are known mechanisms of disease for this gene (PMID: 23919265) (N) 0108 - This gene is known to be associated with both recessive and dominant disease (OMIM) (N) 0112 - Variants in this gene are known to have reduced penetrance (PMID: 31206373). (N) 0200 - Variant is predicted to result in a missense amino acid change from isoleucine to valine (exon 33). (N) 0251 - Variant is heterozygous. (N) 0304 - Variant is present in gnomAD <0.01 for a recessive condition (170 heterozygotes, 0 homozygotes). (P) 0502 - Missense variant with conflicting in silico predictions and/or uninformative conservation. (N) 0604 - Variant is not located in an established domain, motif, hotspot or informative constraint region. (N) 0705 - No comparable variants have previous evidence for pathogenicity. (N) 0808 - Previous reports of pathogenicity are conflicting. This variant has been reported as VUS (7x), likely benign (1x) and benign (1x) in ClinVar. It has also previously been reported in cis with two additional RYR1 variants (p.(Tyr3933Cys) and p.(Arg3366His)) in MH susceptible individuals (PMID: 25958340). In addition, these three RYR1 variants have been reported in trans with the pathogenic p.(Val4849Ile) variant in patients with CCD, multiminicore disease, as well as in a patient with core myopathy and MH susceptibility (PMID: 25960145). (N) 0905 - No segregation evidence has been identified for this variant. (N) 1007 - No published functional evidence has been identified for this variant. (N) 1208 - Inheritance information for this variant is not currently available. (N) Legend: (P) - Pathogenic, (N) - Neutral, (B) - Benign

See cases Uncertain:1

Jul 11, 2020

Laboratorio de Genetica e Diagnostico Molecular, Hospital Israelita Albert Einstein

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

ACMG classification criteria: PS4, PM3

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

Oct 31, 2018

Fulgent Genetics, Fulgent Genetics

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

Computational scores

Source: dbNSFP v4.9

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Benign	0.12
BayesDel_addAF	Benign	-0.038	T
BayesDel_noAF	Pathogenic	0.14
CADD	Benign	19
DANN	Benign	0.94
DEOGEN2	Benign	0.29	T
Eigen	Benign	-0.15
Eigen_PC	Benign	-0.050
FATHMM_MKL	Uncertain	0.93	D
LIST_S2	Benign	0.74	T
M_CAP	Benign	0.080	D
MetaRNN	Benign	0.016	T
MetaSVM	Uncertain	0.18	D
MutationAssessor	Benign	0.49	N
PhyloP100		2.6
PrimateAI	Benign	0.44	T
PROVEAN	Benign	0.27	N
REVEL	Uncertain	0.56
Sift	Benign	0.73	T
Polyphen		0.99	D
Vest4		0.65
MVP		0.94
MPC		0.32
ClinPred		0.022	T
GERP RS		4.0
Varity_R		0.061
gMVP		0.21
Mutation Taster		=41/59	disease causing

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

Other links and lift over

dbSNP: rs146429605; hg19: chr19-38973933;