chr11-47337729-A-T

Variant names:

• chr11-47337729-A-T
• rs187830361
• NM_000256.3:c.2374T>A

Variant summary

Our verdict is Pathogenic. Variant got 14 ACMG points: 14P and 0B. PS1 PM1 PM2 PP3_Strong PP5_Moderate

The NM_000256.3(MYBPC3):​c.2374T>A​(p.Trp792Arg) variant causes a missense change. 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 Likely pathogenic (★). Another nucleotide change resulting in the same amino acid substitution has been previously reported as Pathogenic in Lovd.

• Frequency: Genomes: not found (cov: 31)
• Consequence: MYBPC3 NM_000256.3 missense
• Clinical Significance: Likely pathogenic criteria provided, single submitter P:1
• Conservation: PhyloP100: 5.82

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 14 ACMG points.

• PS1: Transcript NM_000256.3 (MYBPC3) is affected with MISSENSE_VARIANT having same AA change as one Pathogenic present in Lovd
• PM1: In a domain Fibronectin type-III 1 (size 96) in uniprot entity MYPC3_HUMAN there are 31 pathogenic changes around while only 3 benign (91%) in NM_000256.3
• PM2: Very rare variant in population databases, with high coverage
• PP3: MetaRNN computational evidence supports a deleterious effect, 0.991
• PP5: Variant 11-47337729-A-T is Pathogenic according to our data. Variant chr11-47337729-A-T is described in ClinVar as [Likely_pathogenic]. Clinvar id is 578612.Status of the report is criteria_provided_single_submitter, 1 stars. Variant chr11-47337729-A-T is described in Lovd as [Likely_pathogenic].

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
MYBPC3	NM_000256.3	c.2374T>A	p.Trp792Arg	missense_variant	Exon 24 of 35	ENST00000545968.6	NP_000247.2

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
MYBPC3	ENST00000545968.6	c.2374T>A	p.Trp792Arg	missense_variant	Exon 24 of 35	5	NM_000256.3	ENSP00000442795.1
MYBPC3	ENST00000399249.6	c.2374T>A	p.Trp792Arg	missense_variant	Exon 23 of 34	5		ENSP00000382193.2
MYBPC3	ENST00000544791.1	n.2374T>A		non_coding_transcript_exon_variant	Exon 24 of 27	5		ENSP00000444259.1

Frequencies

GnomAD3 genomes Cov.: 31

GnomAD4 exome Cov.: 33

GnomAD4 genome Cov.: 31

ClinVar

Significance: Likely pathogenic

Submissions summary: Pathogenic:1

Revision: criteria provided, single submitter

Submissions by phenotype

Hypertrophic cardiomyopathy Pathogenic:1

Aug 16, 2022

Labcorp Genetics (formerly Invitae), Labcorp

Significance: Likely pathogenic

Review Status: criteria provided, single submitter

Collection Method: clinical testing

Algorithms developed to predict the effect of missense changes on protein structure and function (SIFT, PolyPhen-2, Align-GVGD) all suggest that this variant is likely to be disruptive. ClinVar contains an entry for this variant (Variation ID: 578612). A different variant (c.2374T>C) giving rise to the same protein effect has been determined to be pathogenic (PMID: 15519027, 19808356, 23074333, 24793961, 27532257). This suggests that this variant is also likely to be causative of disease. This variant is not present in population databases (gnomAD no frequency). This sequence change replaces tryptophan, which is neutral and slightly polar, with arginine, which is basic and polar, at codon 792 of the MYBPC3 protein (p.Trp792Arg). In summary, the currently available evidence indicates that the variant is pathogenic, but additional data are needed to prove that conclusively. Therefore, this variant has been classified as Likely Pathogenic. -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Pathogenic	1.0
CardioboostCm	Pathogenic	0.99
BayesDel_addAF	Pathogenic	0.48	D
BayesDel_noAF	Pathogenic	0.45
CADD	Uncertain	25
DANN	Uncertain	1.0
DEOGEN2	Uncertain	0.54	D;T;T
Eigen	Pathogenic	0.91
Eigen_PC	Pathogenic	0.77
FATHMM_MKL	Pathogenic	0.98	D
LIST_S2	Uncertain	0.91	D;D;D
M_CAP	Pathogenic	0.38	D
MetaRNN	Pathogenic	0.99	D;D;D
MetaSVM	Pathogenic	0.89	D
MutationAssessor	Pathogenic	4.7	H;.;.
PrimateAI	Uncertain	0.62	T
PROVEAN	Pathogenic	-12	D;.;D
REVEL	Pathogenic	0.87
Sift	Pathogenic	0.0	D;.;D
Sift4G	Pathogenic	0.0	D;D;D
Vest4		0.99
MVP		0.97
MPC		1.1
ClinPred		1.0	D
GERP RS		4.0
Varity_R		0.98
gMVP		0.96

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: rs187830361; hg19: chr11-47359280;