chr11-47333231-C-T

Position:

• chr11-47333231-C-T

Variant summary

Our verdict is Pathogenic. Variant got 18 ACMG points: 18P and 0B. PVS1 PM2 PP5_Very_Strong

The NM_000256.3(MYBPC3):​c.3293G>A​(p.Trp1098*) variant causes a stop gained change involving the alteration of a non-conserved nucleotide. The variant was absent in control chromosomes in GnomAD project. In-silico tool predicts a pathogenic outcome for this variant. Variant has been reported in ClinVar as Pathogenic (★★). Variant results in nonsense mediated mRNA decay.

• Frequency: Genomes: not found (cov: 32)
• Consequence: MYBPC3 NM_000256.3 stop_gained
• Clinical Significance: Pathogenic criteria provided, multiple submitters, no conflicts P:4
• Conservation: PhyloP100: 0.414

Genes affected

MYBPC3 (HGNC:7551): (myosin binding protein C3) MYBPC3 encodes the cardiac isoform of myosin-binding protein C. Myosin-binding protein C is a myosin-associated protein found in the cross-bridge-bearing zone (C region) of A bands in striated muscle. MYBPC3 is expressed exclusively in heart muscle and is a key regulator of cardiac contraction. Mutations in this gene are a frequent cause of familial hypertrophic cardiomyopathy. [provided by RefSeq, May 2022]

ACMG classification

Verdict is Pathogenic. Variant got 18 ACMG points.

• PVS1: Loss of function variant, product undergoes nonsense mediated mRNA decay. LoF is a known mechanism of disease.
• PM2: Very rare variant in population databases, with high coverage
• PP5: Variant 11-47333231-C-T is Pathogenic according to our data. Variant chr11-47333231-C-T is described in ClinVar as [Pathogenic]. Clinvar id is 42701.Status of the report is criteria_provided_multiple_submitters_no_conflicts, 2 stars. Variant chr11-47333231-C-T is described in Lovd as [Pathogenic].

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
MYBPC3	NM_000256.3	c.3293G>A	p.Trp1098*	stop_gained	30/35	ENST00000545968.6	NP_000247.2

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
MYBPC3	ENST00000545968.6	c.3293G>A	p.Trp1098*	stop_gained	30/35	5	NM_000256.3	ENSP00000442795.1
MYBPC3	ENST00000399249.6	c.3293G>A	p.Trp1098*	stop_gained	29/34	5		ENSP00000382193.2

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome Cov.: 34

GnomAD4 genome Cov.: 32

ClinVar

Significance: Pathogenic

Submissions summary: Pathogenic:4

Revision: criteria provided, multiple submitters, no conflicts

Submissions by phenotype

Hypertrophic cardiomyopathy Pathogenic:2

Pathogenic, criteria provided, single submitter	clinical testing	Laboratory for Molecular Medicine, Mass General Brigham Personalized Medicine	Sep 20, 2011	The Trp1098X variant has been reported in one individual with HCM (Millat 2010) and has been identified in 1 proband with HCM tested by our laboratory. This va riant leads to a premature stop at codon 1098 and is predicted to lead to a trun cated or absent protein. Loss of function of the MYBPC3 gene is an established disease mechanism in HCM patients, which makes it highly likely that the Trp1098 X variant is pathogenic. -
Pathogenic, criteria provided, single submitter	clinical testing	Labcorp Genetics (formerly Invitae), Labcorp	Mar 16, 2017	For these reasons, this variant has been classified as Pathogenic. Loss-of-function variants in MYBPC3 are known to be pathogenic (PMID: 19574547). This variant has been reported in several individuals affected with hypertrophic cardiomyopathy (PMID: 25031304, 23233322, 20624503). This sequence change creates a premature translational stop signal at codon 1098 (p.Trp1098*) of the MYBPC3 gene. It is expected to result in an absent or disrupted protein product. -

Hypertrophic cardiomyopathy 4;C3715165:Left ventricular noncompaction 10 Pathogenic:1

Pathogenic, criteria provided, single submitter

clinical testing

Center for Genomics, Ann and Robert H. Lurie Children's Hospital of Chicago

Mar 30, 2021

MYBPC3 NM_000256.3 exon 29 p.Trp1098* (c.3293G>A): This variant has been reported in the literature in at least 7 individuals with hypertrophic cardiomyopathy (HCM) (Millat 2010 PMID:20624503, Harris 2011 PMID:21415409, Kassem 2012 PMID:23233322, Helms 2014 PMID:25031304). This variant is not present in large control databases but is present in ClinVar (Variation ID:42701). Evolutionary conservation and computational predictive tools for this variant are limited or unavailable. This variant creates a premature stop at this codon which results in an absent or abnormal protein. Loss of function variants are a known mechanism of disease for this gene (Marston 2009 PMID:19574547). In summary, this variant is classified as pathogenic based on the data above. -

not provided Pathogenic:1

Pathogenic, criteria provided, single submitter

clinical testing

Molecular Diagnostic Laboratory for Inherited Cardiovascular Disease, Montreal Heart Institute

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Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
BayesDel_addAF	Pathogenic	0.55	D
BayesDel_noAF	Pathogenic	0.55
CADD	Pathogenic	36
DANN	Uncertain	0.98
Eigen	Uncertain	0.39
Eigen_PC	Benign	0.10
FATHMM_MKL	Benign	0.36	N
Vest4		0.92
GERP RS		-0.50

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: rs397516013; hg19: chr11-47354782;