11-47351437-C-T

Variant names:

Variant summary

Our verdict is Uncertain significance. Variant got 2 ACMG points: 2P and 0B. PM1

The NM_000256.3(MYBPC3):c.94G>A(p.Glu32Lys) variant causes a missense change. The variant allele was found at a frequency of 0.0000385 in 1,608,892 control chromosomes in the GnomAD database, including 1 homozygotes. Variant has been reported in ClinVar as Conflicting classifications of pathogenicity (no stars).

Frequency

Genomes: 𝑓 0.000059 ( 1 hom., cov: 32)

Exomes 𝑓: 0.000036 ( 0 hom. )

Consequence

MYBPC3
NM_000256.3 missense

Scores

Clinical Significance

Conflicting classifications of pathogenicity criteria provided, conflicting classifications U:3B:3

Conservation

PhyloP100: 4.58

Variant links:

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]

MYBPC3 links:

Genome browser will be placed here

ACMG classification

Classification made for transcript

Verdict is Uncertain_significance. Variant got 2 ACMG points.

PM1

In a strand (size 5) in uniprot entity MYPC3_HUMAN there are 4 pathogenic changes around while only 0 benign (100%) in NM_000256.3

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
MYBPC3	NM_000256.3 link	c.94G>A	p.Glu32Lys	missense_variant	Exon 2 of 35	ENST00000545968.6	NP_000247.2	Q14896-1A5YM48

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	UniProt
MYBPC3	ENST00000545968.6 link	c.94G>A	p.Glu32Lys	missense_variant	Exon 2 of 35	5	NM_000256.3	ENSP00000442795.1	Q14896-1
MYBPC3	ENST00000399249.6 link	c.94G>A	p.Glu32Lys	missense_variant	Exon 2 of 34	5		ENSP00000382193.2	A8MXZ9
MYBPC3	ENST00000544791.1 link	n.94G>A		non_coding_transcript_exon_variant	Exon 2 of 27	5		ENSP00000444259.1	F5GZR4

Frequencies

GnomAD3 genomes

AF:

0.0000591

AC:

AN:

152266

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.0000482

Gnomad AMI

AF:

0.00

Gnomad AMR

AF:

0.000458

Gnomad ASJ

AF:

0.00

Gnomad EAS

AF:

0.00

Gnomad SAS

AF:

0.00

Gnomad FIN

AF:

0.00

Gnomad MID

AF:

0.00

Gnomad NFE

AF:

0.00

Gnomad OTH

AF:

0.00

GnomAD3 exomes

AF:

0.000166

AC:

AN:

240644

Hom.:

AF XY:

0.000160

AC XY:

AN XY:

131328

show subpopulations

Gnomad AFR exome

AF:

0.000138

Gnomad AMR exome

AF:

0.00109

Gnomad ASJ exome

AF:

0.00

Gnomad EAS exome

AF:

0.00

Gnomad SAS exome

AF:

0.00

Gnomad FIN exome

AF:

0.00

Gnomad NFE exome

AF:

0.00000918

Gnomad OTH exome

AF:

0.00

GnomAD4 exome

AF:

0.0000364

AC:

AN:

1456626

Hom.:

Cov.:

AF XY:

0.0000373

AC XY:

AN XY:

724220

show subpopulations

Gnomad4 AFR exome

AF:

0.00

Gnomad4 AMR exome

AF:

0.00101

Gnomad4 ASJ exome

AF:

0.00

Gnomad4 EAS exome

AF:

0.00

Gnomad4 SAS exome

AF:

0.00

Gnomad4 FIN exome

AF:

0.00

Gnomad4 NFE exome

AF:

0.00000631

Gnomad4 OTH exome

AF:

0.0000166

GnomAD4 genome

AF:

0.0000591

AC:

AN:

152266

Hom.:

Cov.:

AF XY:

0.0000941

AC XY:

AN XY:

74386

show subpopulations

Gnomad4 AFR

AF:

0.0000482

Gnomad4 AMR

AF:

0.000458

Gnomad4 ASJ

AF:

0.00

Gnomad4 EAS

AF:

0.00

Gnomad4 SAS

AF:

0.00

Gnomad4 FIN

AF:

0.00

Gnomad4 NFE

AF:

0.00

Gnomad4 OTH

AF:

0.00

Alfa

AF:

0.0000294

Hom.:

Bravo

AF:

0.000147

ExAC

AF:

0.0000743

AC:

ClinVar

Significance: Conflicting classifications of pathogenicity

Submissions summary: Uncertain:3Benign:3

Revision: criteria provided, conflicting classifications

LINK: link

Submissions by phenotype

not specified

Uncertain:1Benign:1

Likely benign, criteria provided, single submitter	clinical testing	Women's Health and Genetics/Laboratory Corporation of America, LabCorp	Mar 11, 2021	Variant summary: MYBPC3 c.94G>A (p.Glu32Lys) results in a conservative amino acid change located in the Immunoglobulin I-set (IPR013098) of the encoded protein sequence. Three of five in-silico tools predict a damaging effect of the variant on protein function. The variant allele was found at a frequency of 0.00016 in 272046 control chromosomes, predominantly at a frequency of 0.0011 within the Latino subpopulation in the gnomAD database, including 1 homozygote. The observed variant frequency within Latino control individuals in the gnomAD database is approximately 1.1 fold of the estimated maximal expected allele frequency for a pathogenic variant in MYBPC3 causing Cardiomyopathy phenotype (0.001), strongly suggesting that the variant is a benign polymorphism found primarily in populations of Latino origin. c.94G>A has been reported in the literature (Claes_2016). This report however, does not provide unequivocal conclusions about association of the variant with Cardiomyopathy. To our knowledge, no experimental evidence demonstrating an impact on protein function has been reported. Co-occurrence with another likely pathogenic variant has been reported (TTN c.43732C>T, p.Gln14578Ter) in our internal database, providing supporting evidence for a benign role. Two other ClinVar submitters (evaluation after 2014) cite the variant as uncertain significance (n=1) or likely benign (n=1). Based on the evidence outlined above, the variant was classified as likely benign. -
Uncertain significance, no assertion criteria provided	clinical testing	Stanford Center for Inherited Cardiovascular Disease, Stanford University	Jul 05, 2014	Note this variant was found in clinical genetic testing performed by one or more labs who may also submit to ClinVar. Thus any internal case data may overlap with the internal case data of other labs. The interpretation reviewed below is that of the Stanford Center for Inherited Cardiovascular Disease. MYBPC3 p.Glu32Lys Based on the data reviewed below we consider this variant a variant of uncertain significance. The variant is novel. We could find no reports of the variant in association with disease (as of July 29, 2015). The variant is located in exon 2 of the MYBPC3 gene. It results in a non-conservative amino acid substitution of a negatively charged Glutamic acid with a positively charged Lysine. In silico analysis with PolyPhen-2 predicts the variant to be probably damaging. The glutamic acid at codon 32 is conserved across species, as are neighboring amino acids. Variant in nearby residues have been reported in association with cardiomyopathy (Ala27Val; Val28Met; Thr33Ala; Glu34Asp) (Stenson P et al., 2009), supporting the functional importance of this region. The variant was reported online in 7 of 44,769 individuals in the Exome Aggregation Consortium dataset (http://exac.broadinstitute.org/), which currently includes variant calls on ~64,000 individuals of European, African, Latino and Asian descent (as of July 29th, 2015). Specifically, the variant was observed in 6 of 4281 Latino individuals (MAF 0.07%) and 1 of 3350 African indidiuals. The phenotype of those individuals is not publicly available. The dataset is comprised of multiple cohorts, some of which were recruited from the general population, others were enriched for common cardiovascular disease. -

Hypertrophic cardiomyopathy

Uncertain:1Benign:1

Likely benign, criteria provided, single submitter	clinical testing	Labcorp Genetics (formerly Invitae), Labcorp	Dec 18, 2024	- -
Uncertain significance, criteria provided, single submitter	clinical testing	All of Us Research Program, National Institutes of Health	Sep 23, 2024	This missense variant replaces glutamic acid with lysine at codon 32 of the MYBPC3 protein. Computational prediction suggests that this variant may not impact protein structure and function (internally defined REVEL score threshold <= 0.5, PMID: 27666373). To our knowledge, functional studies have not been reported for this variant. This variant has been reported in three individuals affected with hypertrophic cardiomyopathy in one family (PMID: 26497160). Two of them also carried a pathogenic variant in the MYL2 gene that could explain the observed phenotype. This variant has been identified in 43/272046 chromosomes (40/34794 Latino chromosomes) in the general population by the Genome Aggregation Database (gnomAD). The relatively high frequency of this variant in the general population suggests that this variant is unlikely to be disease-causing. However, additional studies are necessary to determine the role of this variant in disease conclusively. Therefore, this variant is classified as a Variant of Uncertain Significance. -

Cardiomyopathy

Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Color Diagnostics, LLC DBA Color Health

Nov 15, 2023

This missense variant replaces glutamic acid with lysine at codon 32 of the MYBPC3 protein. Computational prediction tool indicates that this variant has an uncertain impact on protein structure and function. To our knowledge, functional studies have not been reported for this variant. This variant has been reported in three individuals affected with hypertrophic cardiomyopathy in one family (PMID: 26497160). Two of them also carried a pathogenic variant in the MYL2 gene that could explain the observed phenotype. This variant has been identified in 43/272046 chromosomes (40/34794 Latino chromosomes) in the general population by the Genome Aggregation Database (gnomAD). The relatively high frequency of this variant in the general population suggests that this variant is unlikely to be disease-causing. However, additional studies are necessary to determine the role of this variant in disease conclusively. Therefore, this variant is classified as a Variant of Uncertain Significance. -

Cardiovascular phenotype

Benign:1

Likely benign, criteria provided, single submitter

clinical testing

Ambry Genetics

Oct 25, 2022

This alteration is classified as likely benign based on a combination of the following: seen in unaffected individuals, population frequency, intact protein function, lack of segregation with disease, co-occurrence, RNA analysis, in silico models, amino acid conservation, lack of disease association in case-control studies, and/or the mechanism of disease or impacted region is inconsistent with a known cause of pathogenicity. -

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

AlphaMissense

Uncertain

0.39

CardioboostCm

Benign

0.040

BayesDel_addAF

Benign

-0.0082

BayesDel_noAF

Pathogenic

0.17

CADD

Benign

DANN

Pathogenic

1.0

DEOGEN2

Benign

0.23

T;T;T

Eigen

Uncertain

0.55

Eigen_PC

Uncertain

0.44

FATHMM_MKL

Uncertain

0.96

LIST_S2

Uncertain

0.95

D;D;D

M_CAP

Uncertain

0.27

MetaRNN

Uncertain

0.64

D;D;D

MetaSVM

Uncertain

-0.029

MutationAssessor

Uncertain

2.5

M;.;.

PrimateAI

Uncertain

0.71

PROVEAN

Benign

-1.6

N;N;N

REVEL

Uncertain

0.45

Sift

Uncertain

0.0070

D;D;D

Sift4G

Uncertain

0.0090

D;D;D

Polyphen

1.0

D;.;.

Vest4

0.93

MutPred

0.50

Gain of MoRF binding (P = 0.0053);Gain of MoRF binding (P = 0.0053);Gain of MoRF binding (P = 0.0053);

MVP

0.90

MPC

0.52

ClinPred

0.15

GERP RS

4.3

Varity_R

0.43

gMVP

0.73

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

Below is the list of publications found by LitVar. It may be empty.

Variant summary

Frequency

Consequence

Scores

Clinical Significance

Conservation

ACMG classification

Transcripts

RefSeq

Ensembl

Frequencies

ClinVar

Submissions by phenotype

Computational scores

Splicing

Publications

LitVar

Other links and lift over