19-38440796-A-G

Variant names:

• chr19-38440796-A-G
• rs193922746
• NM_000540.3:c.97A>G

Variant summary

Our verdict is Likely pathogenic. Variant got 6 ACMG points: 6P and 0B. PM1 PS4_Supporting PP3_Moderate PM6_Supporting

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 lysine with glutamic acid at codon 33 of the RYR1 protein, p.(Lys33Glu). This variant was not present in a large population database (gnomAD) at the time this variant was interpreted. This variant has been reported in an individual diagnosed with King-Denborough syndrome with a personal history of an MH episode and a positive caffeine halothane contracture test (CHCT) result, PS4_Supporting (PMID:18765655). In this individual the variant was determined to be de novo without confirmed parentage PM6_Supporting. 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 >0.85 (0.92) supports a pathogenic status for this variant, PP3_Moderate. This variant has been classified as Likely Pathogenic: PM6_Supporting, PS4_Supporting, PM1, PP3_Moderate. LINK:https://erepo.genome.network/evrepo/ui/classification/CA025005/MONDO:0007783/012

• Frequency: Genomes: not found (cov: 32)
• Consequence: RYR1 NM_000540.3 missense
• Clinical Significance: Likely pathogenic reviewed by expert panel P:2 U:2 O:1
• Conservation: PhyloP100: 9.18

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 Likely_pathogenic. Variant got 6 ACMG points.

• PS4: For more information check the summary or visit ClinGen Evidence Repository.
• PM1: For more information check the summary or visit ClinGen Evidence Repository.
• PM6: 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 rank	MANE	Protein	UniProt
RYR1	NM_000540.3	c.97A>G	p.Lys33Glu	missense_variant	Exon 2 of 106	ENST00000359596.8	NP_000531.2

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
RYR1	ENST00000359596.8	c.97A>G	p.Lys33Glu	missense_variant	Exon 2 of 106	5	NM_000540.3	ENSP00000352608.2
RYR1	ENST00000355481.8	c.97A>G	p.Lys33Glu	missense_variant	Exon 2 of 105	1		ENSP00000347667.3
RYR1	ENST00000599547.6	n.97A>G		non_coding_transcript_exon_variant	Exon 2 of 80	2		ENSP00000471601.2

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome Cov.: 31

GnomAD4 genome Cov.: 32

ClinVar

Significance: Likely pathogenic

Submissions summary: Pathogenic:2 Uncertain:2 Other:1

Revision: reviewed by expert panel

Submissions by phenotype

not provided Uncertain:1 Other:1

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RYR1 database

Significance: not provided

Review Status: no classification provided

Collection Method: literature only

- -

Nov 19, 2013

PreventionGenetics, part of Exact Sciences

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

- -

Malignant hyperthermia, susceptibility to, 1 Pathogenic:1

Apr 06, 2023

ClinGen Malignant Hyperthermia Susceptibility Variant Curation Expert Panel, ClinGen

Significance: Likely pathogenic

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 lysine with glutamic acid at codon 33 of the RYR1 protein, p.(Lys33Glu). This variant was not present in a large population database (gnomAD) at the time this variant was interpreted. This variant has been reported in an individual diagnosed with King-Denborough syndrome with a personal history of an MH episode and a positive caffeine halothane contracture test (CHCT) result, PS4_Supporting (PMID:18765655). In this individual the variant was determined to be de novo without confirmed parentage PM6_Supporting. 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 >0.85 (0.92) supports a pathogenic status for this variant, PP3_Moderate. This variant has been classified as Likely Pathogenic: PM6_Supporting, PS4_Supporting, PM1, PP3_Moderate. -

King Denborough syndrome Pathogenic:1

Sep 02, 2008

OMIM

Significance: Pathogenic

Review Status: no assertion criteria provided

Collection Method: literature only

- -

RYR1-related disorder Uncertain:1

Apr 11, 2023

Labcorp Genetics (formerly Invitae), Labcorp

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

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. ClinVar contains an entry for this variant (Variation ID: 55831). This sequence change replaces lysine, which is basic and polar, with glutamic acid, which is acidic and polar, at codon 33 of the RYR1 protein (p.Lys33Glu). This variant is not present in population databases (gnomAD no frequency). This missense change has been observed in individual(s) with autosomal dominant RYR1-related conditions (PMID: 18765655). -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Pathogenic	0.90
BayesDel_addAF	Pathogenic	0.40	D
BayesDel_noAF	Pathogenic	0.34
CADD	Uncertain	25
DANN	Uncertain	1.0
DEOGEN2	Pathogenic	0.83	.;D
Eigen	Pathogenic	0.77
Eigen_PC	Pathogenic	0.72
FATHMM_MKL	Pathogenic	0.99	D
LIST_S2	Pathogenic	1.0	D;D
M_CAP	Pathogenic	0.96	D
MetaRNN	Pathogenic	0.97	D;D
MetaSVM	Pathogenic	1.1	D
MutationAssessor	Uncertain	2.8	M;M
PrimateAI	Uncertain	0.76	T
PROVEAN	Uncertain	-2.9	D;D
REVEL	Pathogenic	0.92
Sift	Uncertain	0.0030	D;D
Polyphen		1.0	D;D
Vest4		0.69
MutPred		0.83		Gain of helix (P = 0.0078);Gain of helix (P = 0.0078);
MVP		1.0
MPC		1.2
ClinPred		0.99	D
GERP RS		4.9
RBP_binding_hub_radar		0.0
RBP_regulation_power_radar		1.7
Varity_R		0.72
gMVP		0.77

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: rs193922746; hg19: chr19-38931436;