rs1553474619

Positions:

• chr1-237500839-A-G

Variant summary

Our verdict is Uncertain significance. Variant got 3 ACMG points: 3P and 0B. PM2 PP2

The ENST00000366574.7(RYR2):​c.2332A>G​(p.Met778Val) variant causes a missense change involving the alteration of a conserved nucleotide. The variant was absent in control chromosomes in GnomAD project. Variant has been reported in ClinVar as Uncertain significance (★). Another variant affecting the same amino acid position, but resulting in a different missense (i.e. M778I) has been classified as Uncertain significance.

• Frequency: Genomes: not found (cov: 32)
• Consequence: RYR2 ENST00000366574.7 missense
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: 7.50

Genes affected

RYR2 (HGNC:10484): (ryanodine receptor 2) This gene encodes a ryanodine receptor found in cardiac muscle sarcoplasmic reticulum. The encoded protein is one of the components of a calcium channel, composed of a tetramer of the ryanodine receptor proteins and a tetramer of FK506 binding protein 1B proteins, that supplies calcium to cardiac muscle. Mutations in this gene are associated with stress-induced polymorphic ventricular tachycardia and arrhythmogenic right ventricular dysplasia. [provided by RefSeq, Jul 2008]

ACMG classification

Verdict is Uncertain_significance. Variant got 3 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• PP2: Missense variant in gene, where missense usually causes diseases (based on misZ statistic), RYR2. . Gene score misZ 5.7809 (greater than the threshold 3.09). Trascript score misZ 6.4158 (greater than threshold 3.09). GenCC has associacion of gene with hypertrophic cardiomyopathy, arrhythmogenic right ventricular cardiomyopathy, catecholaminergic polymorphic ventricular tachycardia 1, arrhythmogenic right ventricular dysplasia 2, catecholaminergic polymorphic ventricular tachycardia.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
RYR2	NM_001035.3	c.2332A>G	p.Met778Val	missense_variant	21/105	ENST00000366574.7	NP_001026.2

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
RYR2	ENST00000366574.7	c.2332A>G	p.Met778Val	missense_variant	21/105	1	NM_001035.3	ENSP00000355533	P1
RYR2	ENST00000660292.2	c.2332A>G	p.Met778Val	missense_variant	21/106			ENSP00000499787
RYR2	ENST00000659194.3	c.2332A>G	p.Met778Val	missense_variant	21/105			ENSP00000499653
RYR2	ENST00000609119.2	c.2332A>G	p.Met778Val	missense_variant, NMD_transcript_variant	21/104	5		ENSP00000499659

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome Cov.: 31

GnomAD4 genome Cov.: 32

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

Submissions by phenotype

Catecholaminergic polymorphic ventricular tachycardia 1 Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Labcorp Genetics (formerly Invitae), Labcorp

Nov 27, 2017

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. Algorithms developed to predict the effect of missense changes on protein structure and function do not agree on the potential impact of this missense change (SIFT: "Deleterious"; PolyPhen-2: "Benign"; Align-GVGD: "Class C15"). This variant has not been reported in the literature in individuals with RYR2-related disease. This variant is not present in population databases (ExAC no frequency). This sequence change replaces methionine with valine at codon 778 of the RYR2 protein (p.Met778Val). The methionine residue is highly conserved and there is a small physicochemical difference between methionine and valine. A different missense substitution at this codon (p.Met778Ile) has been reported in an individual affected with dilated cardiomyopathy (PMID: 27532257). This variant is also known as p.M778I in the literature. -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Uncertain	0.49
BayesDel_addAF	Pathogenic	0.20	D
BayesDel_noAF	Uncertain	0.050
CADD	Benign	21
DANN	Uncertain	0.99
DEOGEN2	Uncertain	0.49	T;T
Eigen	Uncertain	0.22
Eigen_PC	Uncertain	0.41
FATHMM_MKL	Uncertain	0.95	D
LIST_S2	Benign	0.81	T;T
M_CAP	Benign	0.012	T
MetaRNN	Uncertain	0.63	D;D
MetaSVM	Benign	-0.94	T
MutationAssessor	Benign	1.8	L;.
MutationTaster	Benign	1.0	D
PrimateAI	Uncertain	0.75	T
PROVEAN	Uncertain	-2.5	D;.
REVEL	Uncertain	0.31
Sift	Benign	0.58	T;.
Polyphen		0.28	B;.
Vest4		0.87
MutPred		0.55		Gain of sheet (P = 0.1208);.;
MVP		0.80
MPC		0.65
ClinPred		0.84	D
GERP RS		6.0
Varity_R		0.35
gMVP		0.56

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: rs1553474619; hg19: chr1-237664139;