19-38455528-C-T

Variant names:

• chr19-38455528-C-T
• rs193922770
• NM_000540.3:c.1654C>T

Variant summary

Our verdict is Likely pathogenic. The variant received 7 ACMG points: 7P and 0B. PS4_Moderate PS3_Moderate PM1 PP1

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 Tryptophan at codon 552 of the RYR1 protein, p.(Arg552Trp). The maximum allele frequency for this variant among the six major gnomAD populations is AMR: 0.00003, a frequency consistent with pathogenicity for MHS. This variant has been reported in 6 unrelated individuals who have a personal or family history of a malignant hyperthermia reaction, 5 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), PS4_Moderate (PMID:30236257, PMID:9138151, PMID:16244001). This variant segregates with MHS in three families, PP1 (PMID:30236257). Functional studies in HEK293 cells show an increased sensitivity to RYR1 agonists, PS3_Moderate (PMID:9334205). 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 0.83 supports neither a pathogenic nor a benign status for this variant.implemented: PS4_Moderate, PS3_Moderate, PM1, PP1. LINK:https://erepo.genome.network/evrepo/ui/classification/CA024299/MONDO:0007783/012

• Frequency:
  • Genomes: not found (cov: 31)
  • Exomes 𝑓: 0.0000027 (0 hom.)
• Consequence: RYR1 NM_000540.3 missense
• Clinical Significance: Likely pathogenic; drug response reviewed by expert panel P:4 O:8
• Conservation: PhyloP100: 0.910
• Publications: 14 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), PanelApp Australia, Genomics England PanelApp, Ambry Genetics, ClinGen
• RYR1-related myopathy

  Inheritance: AD, AR Classification: DEFINITIVE, STRONG Submitted by: ClinGen, PanelApp Australia
• congenital multicore myopathy with external ophthalmoplegia

  Inheritance: AR Classification: DEFINITIVE, STRONG Submitted by: G2P, Genomics England PanelApp
• central core myopathy

  Inheritance: AD, AR Classification: STRONG, SUPPORTIVE Submitted by: Orphanet, Labcorp Genetics (formerly Invitae), 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_pathogenic. The variant received 7 ACMG points.

• PS3: For more information check the summary or visit ClinGen Evidence Repository.
• PS4: For more information check the summary or visit ClinGen Evidence Repository.
• PM1: For more information check the summary or visit ClinGen Evidence Repository.
• PP1: 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

Sel.	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	RYR1	NM_000540.3	MANE Select	c.1654C>T	p.Arg552Trp	missense	Exon 15 of 106	NP_000531.2	P21817-1
	RYR1	NM_001042723.2		c.1654C>T	p.Arg552Trp	missense	Exon 15 of 105	NP_001036188.1	P21817-2

Ensembl Transcripts

Sel.	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	RYR1	ENST00000359596.8	TSL:5 MANE Select	c.1654C>T	p.Arg552Trp	missense	Exon 15 of 106	ENSP00000352608.2	P21817-1
	RYR1	ENST00000355481.8	TSL:1	c.1654C>T	p.Arg552Trp	missense	Exon 15 of 105	ENSP00000347667.3	P21817-2
	RYR1	ENST00000594335.6	TSL:1	n.1654C>T		non_coding_transcript_exon	Exon 15 of 103	ENSP00000470927.2	M0R014

Frequencies

GnomAD3 genomes Cov.: 31

GnomAD2 exomes AF: 0.00000398 AC: 1 AN: 251466 AF XY: 0.00

Gnomad AFR exome AF: 0.00

Gnomad AMR exome AF: 0.0000289

Gnomad ASJ exome AF: 0.00

Gnomad EAS exome AF: 0.00

Gnomad FIN exome AF: 0.00

Gnomad NFE exome AF: 0.00

Gnomad OTH exome AF: 0.00

GnomAD4 exome AF: 0.00000274 AC: 4 AN: 1461866 Hom.: 0 Cov.: 55 AF XY: 0.00000138 AC XY: 1 AN XY: 727238

African (AFR) AF: 0.00 AC: 0 AN: 33480

American (AMR) AF: 0.0000224 AC: 1 AN: 44718

Ashkenazi Jewish (ASJ) AF: 0.00 AC: 0 AN: 26136

East Asian (EAS) AF: 0.00 AC: 0 AN: 39700

South Asian (SAS) AF: 0.0000232 AC: 2 AN: 86254

European-Finnish (FIN) AF: 0.00 AC: 0 AN: 53418

Middle Eastern (MID) AF: 0.00 AC: 0 AN: 5768

European-Non Finnish (NFE) AF: 8.99e-7 AC: 1 AN: 1111996

Other (OTH) AF: 0.00 AC: 0 AN: 60396

GnomAD4 genome Cov.: 31

Alfa AF: 0.00000534 Hom.: 0

ClinVar

ClinVar submissions

Significance: Likely pathogenic; drug response

Revision: reviewed by expert panel

Pathogenic	VUS	Benign	Condition
1	-	-	Central core myopathy (1)
1	-	-	Malignant hyperthermia, susceptibility to, 1 (1)
1	-	-	not provided (2)
1	-	-	RYR1-related disorder (1)
-	-	-	desflurane response - Toxicity (1)
-	-	-	enflurane response - Toxicity (1)
-	-	-	halothane response - Toxicity (1)
-	-	-	isoflurane response - Toxicity (1)
-	-	-	methoxyflurane response - Toxicity (1)
-	-	-	sevoflurane response - Toxicity (1)
-	-	-	succinylcholine response - Toxicity (1)

Computational scores

Source: dbNSFP v4.9

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Pathogenic	0.97
BayesDel_addAF	Pathogenic	0.42	D
BayesDel_noAF	Pathogenic	0.37
CADD	Uncertain	24
DANN	Uncertain	1.0
DEOGEN2	Pathogenic	0.90	D
Eigen	Uncertain	0.22
Eigen_PC	Benign	0.087
FATHMM_MKL	Benign	0.0068	N
LIST_S2	Pathogenic	0.98	D
M_CAP	Pathogenic	0.58	D
MetaRNN	Pathogenic	0.97	D
MetaSVM	Pathogenic	0.92	D
MutationAssessor	Uncertain	2.1	M
PhyloP100		0.91
PrimateAI	Uncertain	0.77	T
PROVEAN	Pathogenic	-6.5	D
REVEL	Pathogenic	0.83
Sift	Benign	0.045	D
Polyphen		1.0	D
Vest4		0.79
MutPred		0.86		Gain of catalytic residue at L550 (P = 0.0026)
MVP		1.0
MPC		0.94
ClinPred		0.96	D
GERP RS		2.9
Varity_R		0.40
gMVP		0.85
Mutation Taster		=1/99	disease causing

Splicing

Name	Calibrated prediction	Score	Prediction
SpliceAI score (max)		0.010		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: rs193922770; hg19: chr19-38946168; COSMIC: COSV62102500;