chr19-38455247-A-G

Variant names:

• chr19-38455247-A-G
• rs147723844
• NM_000540.3:c.1453A>G

Variant summary

Our verdict is Uncertain significance. The variant received 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 Methionine with Valine at codon 485 of the RYR1 protein, p.(Met485Val). The maximum allele frequency for this variant among the six major gnomAD populations is NFE: 0.00061, a frequency consistent with pathogenicity for MHS. This variant has been reported in individuals with central core disease and other myopathies inherited in a recessive pattern. No functional studies were identified for this variant that fulfilled the criteria for functional data as put forth by the ClinGen RYR1 VCEP for MHS (one study tested this variant in myotubes in the presence of other variants (PMID:16940308)). 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 0.551 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/CA024169/MONDO:0007783/012

• Frequency:
  • Genomes: 𝑓 0.00035 (0 hom., cov: 31)
  • Exomes 𝑓: 0.00028 (0 hom.)
• Consequence: RYR1 NM_000540.3 missense
• Clinical Significance: Uncertain significance reviewed by expert panel U:15 B:8 O:2
• Conservation: PhyloP100: 0.655
• Publications: 18 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

Specifications for RYR1 are available in the ClinGen Criteria Specification Registry and recommended for reference when assigning criteria.

Our verdict: Uncertain_significance. The variant received 2 ACMG points.

• PM1: 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.1453A>G	p.Met485Val	missense	Exon 14 of 106	NP_000531.2	P21817-1
	RYR1	NM_001042723.2		c.1453A>G	p.Met485Val	missense	Exon 14 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.1453A>G	p.Met485Val	missense	Exon 14 of 106	ENSP00000352608.2	P21817-1
	RYR1	ENST00000355481.8	TSL:1	c.1453A>G	p.Met485Val	missense	Exon 14 of 105	ENSP00000347667.3	P21817-2
	RYR1	ENST00000594335.6	TSL:1	n.1453A>G		non_coding_transcript_exon	Exon 14 of 103	ENSP00000470927.2	M0R014

Frequencies

GnomAD3 genomes AF: 0.000349 AC: 53 AN: 152072 Hom.: 0 Cov.: 31

Gnomad AFR AF: 0.000193

Gnomad AMI AF: 0.00

Gnomad AMR AF: 0.000328

Gnomad ASJ AF: 0.00

Gnomad EAS AF: 0.000193

Gnomad SAS AF: 0.00

Gnomad FIN AF: 0.00

Gnomad MID AF: 0.00316

Gnomad NFE AF: 0.000559

Gnomad OTH AF: 0.00

GnomAD2 exomes AF: 0.000342 AC: 86 AN: 251488 AF XY: 0.000346

Gnomad AFR exome AF: 0.000185

Gnomad AMR exome AF: 0.000231

Gnomad ASJ exome AF: 0.00

Gnomad EAS exome AF: 0.0000544

Gnomad FIN exome AF: 0.00

Gnomad NFE exome AF: 0.000624

Gnomad OTH exome AF: 0.000489

GnomAD4 exome AF: 0.000284 AC: 415 AN: 1461874 Hom.: 0 Cov.: 54 AF XY: 0.000271 AC XY: 197 AN XY: 727242

African (AFR) AF: 0.0000597 AC: 2 AN: 33480

American (AMR) AF: 0.000224 AC: 10 AN: 44724

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

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

South Asian (SAS) AF: 0.0000116 AC: 1 AN: 86256

European-Finnish (FIN) AF: 0.0000374 AC: 2 AN: 53420

Middle Eastern (MID) AF: 0.000693 AC: 4 AN: 5768

European-Non Finnish (NFE) AF: 0.000347 AC: 386 AN: 1111996

Other (OTH) AF: 0.000166 AC: 10 AN: 60396

GnomAD4 genome AF: 0.000348 AC: 53 AN: 152190 Hom.: 0 Cov.: 31 AF XY: 0.000282 AC XY: 21 AN XY: 74408

African (AFR) AF: 0.000193 AC: 8 AN: 41518

American (AMR) AF: 0.000327 AC: 5 AN: 15284

Ashkenazi Jewish (ASJ) AF: 0.00 AC: 0 AN: 3468

East Asian (EAS) AF: 0.000193 AC: 1 AN: 5182

South Asian (SAS) AF: 0.00 AC: 0 AN: 4818

European-Finnish (FIN) AF: 0.00 AC: 0 AN: 10612

Middle Eastern (MID) AF: 0.00340 AC: 1 AN: 294

European-Non Finnish (NFE) AF: 0.000559 AC: 38 AN: 67992

Other (OTH) AF: 0.00 AC: 0 AN: 2110

Alfa AF: 0.000462 Hom.: 0

Bravo AF: 0.000306

TwinsUK AF: 0.00108 AC: 4

ALSPAC AF: 0.000519 AC: 2

ESP6500AA AF: 0.000227 AC: 1

ESP6500EA AF: 0.000116 AC: 1

ExAC AF: 0.000469 AC: 57

EpiCase AF: 0.000545

EpiControl AF: 0.000652

ClinVar

ClinVar submissions

Significance: Uncertain significance

Revision: reviewed by expert panel

Pathogenic	VUS	Benign	Condition
-	4	2	Malignant hyperthermia, susceptibility to, 1 (6)
-	6	-	not provided (7)
-	-	2	Central core myopathy (2)
-	1	1	not specified (2)
-	1	1	RYR1-related disorder (3)
-	-	1	Congenital multicore myopathy with external ophthalmoplegia (1)
-	1	-	Congenital myopathy with fiber type disproportion (1)
-	1	-	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 (1)
-	1	-	Malignant hyperthermia of anesthesia (1)
-	-	1	Neuromuscular disease, congenital, with uniform type 1 fiber (1)

Computational scores

Source: dbNSFP v4.9

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Benign	0.081
BayesDel_addAF	Benign	-0.048	T
BayesDel_noAF	Uncertain	0.060
CADD	Benign	13
DANN	Benign	0.66
DEOGEN2	Uncertain	0.64	D
Eigen	Benign	-0.87
Eigen_PC	Benign	-0.83
FATHMM_MKL	Pathogenic	0.99	D
LIST_S2	Benign	0.81	T
M_CAP	Uncertain	0.14	D
MetaRNN	Benign	0.048	T
MetaSVM	Uncertain	-0.25	T
MutationAssessor	Benign	0.69	N
PhyloP100		0.66
PrimateAI	Uncertain	0.51	T
PROVEAN	Benign	-1.1	N
REVEL	Uncertain	0.55
Sift	Uncertain	0.0040	D
Polyphen		0.045	B
Vest4		0.39
MVP		0.78
MPC		0.34
ClinPred		0.030	T
GERP RS		-2.1
Varity_R		0.16
gMVP		0.57
Mutation Taster		=2/98	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: rs147723844; hg19: chr19-38945887;