rs778241277

Positions:

chr19-38466144-G-A

Variant summary

Our verdict is Uncertain significance. Variant got 0 ACMG points: 1P and 1B. PS4_SupportingBP4

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 glutamine at codon 975 of the RYR1 protein, (p.Arg975Gln). The maximum allele frequency for this variant among the six major gnomAD populations is NFE: 0.00002, a frequency consistent with pathogenicity for MHS. 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), PS4_Supporting (PMID:30236257). 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 <0.5 (0.329) supports a benign status for this variant, BP4. This variant has been classified as a Variant of Unknown Significance. Criteria implemented: PS4_supporting, BP4. LINK:https://erepo.genome.network/evrepo/ui/classification/CA064203/MONDO:0007783/012

Frequency

Genomes: 𝑓 0.0000066 ( 0 hom., cov: 32)

Exomes 𝑓: 0.0000055 ( 0 hom. )

Consequence

RYR1
NM_000540.3 missense

Scores

Clinical Significance

Uncertain significance reviewed by expert panel U:7

Conservation

PhyloP100: 4.43

Variant links:

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 links:

Genome browser will be placed here

ACMG classification

Classification made for transcript

Verdict is Uncertain_significance. Variant got 0 ACMG points.

PS4

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

BP4

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 linkuse as main transcript	c.2924G>A	p.Arg975Gln	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 linkuse as main transcript	c.2924G>A	p.Arg975Gln	missense_variant	24/106	5	NM_000540.3	ENSP00000352608	A2	P21817-1
RYR1	ENST00000355481.8 linkuse as main transcript	c.2924G>A	p.Arg975Gln	missense_variant	24/105	1		ENSP00000347667	P4	P21817-2
RYR1	ENST00000594111.1 linkuse as main transcript	n.17G>A		non_coding_transcript_exon_variant	1/2	2
RYR1	ENST00000599547.6 linkuse as main transcript	c.2924G>A	p.Arg975Gln	missense_variant, NMD_transcript_variant	24/80	2		ENSP00000471601

Frequencies

GnomAD3 genomes

AF:

0.00000657

AC:

AN:

152160

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.00

Gnomad AMI

AF:

0.00

Gnomad AMR

AF:

0.00

Gnomad ASJ

AF:

0.00

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:

0.0000122

AC:

AN:

246568

Hom.:

AF XY:

0.00000747

AC XY:

AN XY:

133942

show subpopulations

Gnomad AFR exome

AF:

0.00

Gnomad AMR exome

AF:

0.00

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:

0.0000180

Gnomad OTH exome

AF:

0.000166

GnomAD4 exome

AF:

0.00000548

AC:

AN:

1461004

Hom.:

Cov.:

AF XY:

0.00000688

AC XY:

AN XY:

726820

show subpopulations

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:

0.0000189

Gnomad4 NFE exome

AF:

0.00000540

Gnomad4 OTH exome

AF:

0.00

GnomAD4 genome

AF:

0.00000657

AC:

AN:

152160

Hom.:

Cov.:

AF XY:

0.00

AC XY:

AN XY:

74330

show subpopulations

Gnomad4 AFR

AF:

0.00

Gnomad4 AMR

AF:

0.00

Gnomad4 ASJ

AF:

0.00

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:

0.00000378

ExAC

AF:

0.0000165

AC:

EpiCase

AF:

0.0000545

EpiControl

AF:

0.00

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:7

Revision: reviewed by expert panel

LINK: link

Submissions by phenotype

Malignant hyperthermia, susceptibility to, 1

Uncertain:3

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 glutamine at codon 975 of the RYR1 protein, (p.Arg975Gln). The maximum allele frequency for this variant among the six major gnomAD populations is NFE: 0.00002, a frequency consistent with pathogenicity for MHS. 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), PS4_Supporting (PMID:30236257). 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 <0.5 (0.329) supports a benign status for this variant, BP4. This variant has been classified as a Variant of Unknown Significance. Criteria implemented: PS4_supporting, BP4. -
Uncertain significance, criteria provided, single submitter	clinical testing	Baylor Genetics	Apr 26, 2023	- -
Uncertain significance, criteria provided, single submitter	clinical testing	All of Us Research Program, National Institutes of Health	Nov 20, 2023	This missense variant replaces arginine with glutamine at codon 975 of the RYR1 protein. Computational prediction suggests that this variant may not impact protein structure and function (internally defined REVEL score threshold <= 0.5, PMID: 27666373). To our knowledge, functional studies have not been reported for this variant. This variant has been reported in at least one individual affected with malignant hyperthermia susceptibility (PMID: 30236257). This variant has been identified in 3/246568 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. -

not provided

Uncertain:2

Uncertain significance, criteria provided, single submitter	clinical testing	PreventionGenetics, part of Exact Sciences	Aug 17, 2015	- -
Uncertain significance, criteria provided, single submitter	clinical testing	Revvity Omics, Revvity	Sep 02, 2019	- -

not specified

Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

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

Sep 03, 2024

Variant summary: RYR1 c.2924G>A (p.Arg975Gln) results in a conservative amino acid change located in the Ryanodine receptor Ryr (IPR003032) of the encoded protein sequence. Five of five in-silico tools predict a benign effect of the variant on protein function. The variant allele was found at a frequency of 1.2e-05 in 246568 control chromosomes (gnomAD). The available data on variant occurrences in the general population are insufficient to allow any conclusion about variant significance. c.2924G>A has been reported in the literature in at least an individual affected with malignant hyperthermia (example: Miller_2018). This report does not provide unequivocal conclusions about association of the variant with Malignant Hyperthermia Susceptibility. 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: 35849058, 30236257). ClinVar contains an entry for this variant (Variation ID: 590508). 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

Sep 19, 2022

This sequence change replaces arginine, which is basic and polar, with glutamine, which is neutral and polar, at codon 975 of the RYR1 protein (p.Arg975Gln). This variant is present in population databases (rs778241277, gnomAD 0.002%). This variant has not been reported in the literature in individuals affected with RYR1-related conditions. ClinVar contains an entry for this variant (Variation ID: 590508). 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. 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. -

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

AlphaMissense

Benign

0.10

BayesDel_addAF

Benign

-0.014

BayesDel_noAF

Benign

-0.24

CADD

Benign

DANN

Uncertain

1.0

DEOGEN2

Benign

0.40

.;T

Eigen

Uncertain

0.20

Eigen_PC

Benign

0.22

FATHMM_MKL

Benign

0.69

LIST_S2

Pathogenic

0.98

D;D

M_CAP

Uncertain

0.20

MetaRNN

Uncertain

0.50

T;T

MetaSVM

Uncertain

-0.27

MutationAssessor

Benign

0.76

N;N

MutationTaster

Benign

0.96

N;N;N

PrimateAI

Uncertain

0.52

PROVEAN

Benign

-1.3

N;N

REVEL

Uncertain

0.33

Sift

Benign

0.23

T;T

Polyphen

0.99

D;P

Vest4

0.47

MutPred

0.41

Gain of helix (P = 0.062);Gain of helix (P = 0.062);

MVP

0.95

MPC

0.99

ClinPred

0.79

GERP RS

2.7

Varity_R

0.080

gMVP

0.26

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

Below is the list of publications found by LitVar. It may be empty.

Variant summary

Frequency

Consequence

Scores

Clinical Significance

Conservation

ACMG classification

Transcripts

RefSeq

Ensembl

Frequencies

ClinVar

Submissions by phenotype

Computational scores

Splicing

Publications

LitVar

Other links and lift over