chr19-38499997-G-A

Variant names:

• chr19-38499997-G-A
• rs28933396
• NM_000540.3:c.7304G>A

Variant summary

Our verdict is Pathogenic. The variant received 14 ACMG points: 14P and 0B. PS4 PS3_Moderate PM1 PP3_Moderate PP1_Strong

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 histidine at codon 2435 of the RYR1 protein, p.(Arg2435His). This variant was not present in a large population database (gnomAD) at the time this variant was interpreted. This variant has been reported in 26 unrelated individuals who have a personal or family history of a malignant hyperthermia reaction, 24 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 (PMID:30236257, 16163667, 21965348, 23842196, 12059893, 17081152, 17710899, 20681998, 31559918, 16732084, 19513315). Functional studies in HEK293 cells shows an increased sensitivity to RYR1 agonists, PS3_Moderate (PMID:9334205, 27586648). This variant resides in a region of RYR1 considered to be a hotspot for pathogenic variants that contribute to MHS, PM1 (PMID:21118704). This variant segregates with MHS in at least 10 families individuals, PP1_Strong (PMID:12059893, 30236257, 32919876). A REVEL score >0.85 (0.944) supports a pathogenic status for this variant, PP3_Moderate. This variant has been classified as Pathogenic. Criteria implemented: PS3_Moderate, PS4, PM1, PP1_Strong, PP3_Moderate. LINK:https://erepo.genome.network/evrepo/ui/classification/CA024750/MONDO:0007783/012

• Frequency:
  • Genomes: not found (cov: 32)
  • Exomes 𝑓: 6.8e-7 (0 hom.)
• Consequence: RYR1 NM_000540.3 missense
• Clinical Significance: Pathogenic; drug response reviewed by expert panel P:8 O:9
• Conservation: PhyloP100: 9.98
• Publications: 36 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: Pathogenic. The variant received 14 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.
• PP3: 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.7304G>A	p.Arg2435His	missense	Exon 45 of 106	NP_000531.2	P21817-1
	RYR1	NM_001042723.2		c.7304G>A	p.Arg2435His	missense	Exon 45 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.7304G>A	p.Arg2435His	missense	Exon 45 of 106	ENSP00000352608.2	P21817-1
	RYR1	ENST00000355481.8	TSL:1	c.7304G>A	p.Arg2435His	missense	Exon 45 of 105	ENSP00000347667.3	P21817-2
	RYR1	ENST00000594335.6	TSL:1	n.7304G>A		non_coding_transcript_exon	Exon 45 of 103	ENSP00000470927.2	M0R014

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome AF: 6.84e-7 AC: 1 AN: 1461798 Hom.: 0 Cov.: 36 AF XY: 0.00 AC XY: 0 AN XY: 727198

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

American (AMR) AF: 0.00 AC: 0 AN: 44718

Ashkenazi Jewish (ASJ) AF: 0.00 AC: 0 AN: 26134

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

South Asian (SAS) AF: 0.00 AC: 0 AN: 86254

European-Finnish (FIN) AF: 0.00 AC: 0 AN: 53388

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

European-Non Finnish (NFE) AF: 8.99e-7 AC: 1 AN: 1111968

Other (OTH) AF: 0.00 AC: 0 AN: 60388

GnomAD4 genome Cov.: 32

Alfa AF: 0.00 Hom.: 0

Bravo AF: 0.00000378

ClinVar

ClinVar submissions

Significance: Pathogenic; drug response

Revision: reviewed by expert panel

Pathogenic	VUS	Benign	Condition
3	-	-	not provided (4)
1	-	-	Central core myopathy (2)
1	-	-	Malignant hyperthermia of anesthesia (1)
1	-	-	Malignant hyperthermia, susceptibility to, 1 (1)
1	-	-	Malignant hyperthermia, susceptibility to, 1;C5830701:Central core myopathy (1)
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	0.79
BayesDel_addAF	Pathogenic	0.52	D
BayesDel_noAF	Pathogenic	0.51
CADD	Pathogenic	27
DANN	Uncertain	1.0
DEOGEN2	Pathogenic	0.85	D
Eigen	Uncertain	0.63
Eigen_PC	Uncertain	0.52
FATHMM_MKL	Pathogenic	0.99	D
LIST_S2	Pathogenic	1.0	D
M_CAP	Pathogenic	0.69	D
MetaRNN	Pathogenic	0.99	D
MetaSVM	Pathogenic	1.1	D
MutationAssessor	Uncertain	2.6	M
PhyloP100		10
PrimateAI	Pathogenic	0.83	D
PROVEAN	Pathogenic	-4.8	D
REVEL	Pathogenic	0.94
Sift	Uncertain	0.0010	D
Polyphen		1.0	D
Vest4		0.81
MutPred		0.94		Gain of catalytic residue at R2435 (P = 0.1093)
MVP		1.0
MPC		0.38
ClinPred		1.0	D
GERP RS		4.0
Varity_R		0.63
gMVP		0.87
Mutation Taster		=3/97	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: rs28933396; hg19: chr19-38990637; COSMIC: COSV106107828;