rs770593660

Positions:

• chr19-38494381-G-C
• chr19-38494381-G-T

Variant summary

Our verdict is Uncertain significance. Variant got 2 ACMG points: 2P and 0B. PM1

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 valine with leucine at codon 2102 of the RYR1 protein, p.Val2102Leu. The maximum allele frequency for this variant among the six major gnomAD populations is NFE: 0.000018, 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), however, this variant was in cis to a second RYR1 variant that has been classified as a variant of uncertain significance (p.Arg1583Cys), for that reason PS4 was not implemented (PMID:23035052). The allele containing both variants segregated with MHS in four individuals in this family, however, since the effect of the two alleles cannot be separated PP1 was not implemented for this variant (PMID:23035052). 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 (PMID:21118704). A REVEL score of 0.515 supports neither a pathogenic nor a benign status for this variant. This variant has been classified as a Variant of Unknown Significance. Criteria implemented: PM1. LINK:https://erepo.genome.network/evrepo/ui/classification/CA068028/MONDO:0007783/012

• Frequency:
  • Genomes: not found (cov: 31)
  • Exomes 𝑓: 0.0000014 (0 hom.)
• Consequence: RYR1 NM_000540.3 missense
• Clinical Significance: Uncertain significance reviewed by expert panel U:3
• Conservation: PhyloP100: 4.48

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 2 ACMG points.

• PM1: 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.6304G>C	p.Val2102Leu	missense_variant	39/106	ENST00000359596.8	NP_000531.2

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
RYR1	ENST00000359596.8	c.6304G>C	p.Val2102Leu	missense_variant	39/106	5	NM_000540.3	ENSP00000352608.2
RYR1	ENST00000355481.8	c.6304G>C	p.Val2102Leu	missense_variant	39/105	1		ENSP00000347667.3
RYR1	ENST00000599547.6	n.6304G>C		non_coding_transcript_exon_variant	39/80	2		ENSP00000471601.2

Frequencies

GnomAD3 genomes Cov.: 31

GnomAD3 exomes AF: 0.00000807 AC: 2 AN: 247692 Hom.: 0 AF XY: 0.00000743 AC XY: 1 AN XY: 134640

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: 0.0000181

Gnomad OTH exome AF: 0.00

GnomAD4 exome AF: 0.00000137 AC: 2 AN: 1459404 Hom.: 0 Cov.: 32 AF XY: 0.00000138 AC XY: 1 AN XY: 726006

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: 0.00000180

Gnomad4 OTH exome AF: 0.00

GnomAD4 genome Cov.: 31

ExAC AF: 0.0000165 AC: 2

EpiCase AF: 0.00

EpiControl AF: 0.000119

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:3

Revision: reviewed by expert panel

Submissions by phenotype

Malignant hyperthermia, susceptibility to, 1 Uncertain:2

Uncertain significance, criteria provided, single submitter	clinical testing	All of Us Research Program, National Institutes of Health	May 09, 2024	- -
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 valine with leucine at codon 2102 of the RYR1 protein, p.Val2102Leu. The maximum allele frequency for this variant among the six major gnomAD populations is NFE: 0.000018, 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), however, this variant was in cis to a second RYR1 variant that has been classified as a variant of uncertain significance (p.Arg1583Cys), for that reason PS4 was not implemented (PMID:23035052). The allele containing both variants segregated with MHS in four individuals in this family, however, since the effect of the two alleles cannot be separated PP1 was not implemented for this variant (PMID:23035052). 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 (PMID: 21118704). A REVEL score of 0.515 supports neither a pathogenic nor a benign status for this variant. This variant has been classified as a Variant of Unknown Significance. Criteria implemented: PM1. -

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

Jul 26, 2021

- -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Uncertain	0.46
BayesDel_addAF	Pathogenic	0.27	D
BayesDel_noAF	Pathogenic	0.17
CADD	Benign	19
DANN	Benign	0.95
DEOGEN2	Benign	0.30	.;T
Eigen	Benign	-0.28
Eigen_PC	Benign	-0.075
FATHMM_MKL	Uncertain	0.90	D
LIST_S2	Uncertain	0.94	D;D
M_CAP	Benign	0.037	D
MetaRNN	Benign	0.24	T;T
MetaSVM	Uncertain	-0.047	T
MutationAssessor	Benign	0.81	L;L
PrimateAI	Uncertain	0.59	T
PROVEAN	Benign	-0.21	N;N
REVEL	Uncertain	0.52
Sift	Benign	0.34	T;T
Polyphen		0.0020	B;B
Vest4		0.53
MutPred		0.32		Gain of catalytic residue at V2102 (P = 0.0986);Gain of catalytic residue at V2102 (P = 0.0986);
MVP		0.90
MPC		0.30
ClinPred		0.31	T
GERP RS		3.7
RBP_binding_hub_radar		0.0
RBP_regulation_power_radar		1.7
Varity_R		0.046
gMVP		0.21

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: rs770593660; hg19: chr19-38985021;