11-47346303-C-T

Variant names:

Variant summary

Our verdict is Uncertain significance. Variant got 1 ACMG points: 1P and 0B. PP3

The NM_000256.3(MYBPC3):c.994G>A(p.Glu332Lys) variant causes a missense change involving the alteration of a conserved nucleotide. The variant allele was found at a frequency of 0.0000329 in 1,613,086 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a pathogenic outcome for this variant. Variant has been reported in ClinVar as Uncertain significance (★★).

Frequency

Genomes: 𝑓 0.0000066 ( 0 hom., cov: 32)

Exomes 𝑓: 0.000036 ( 0 hom. )

Consequence

MYBPC3
NM_000256.3 missense

Scores

Clinical Significance

Uncertain significance criteria provided, multiple submitters, no conflicts U:8

Conservation

PhyloP100: 7.53

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 1 ACMG points.

PP3

MetaRNN computational evidence supports a deleterious effect, 0.812

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
MYBPC3	NM_000256.3 link	c.994G>A	p.Glu332Lys	missense_variant	Exon 12 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.994G>A	p.Glu332Lys	missense_variant	Exon 12 of 35	5	NM_000256.3	ENSP00000442795.1	Q14896-1
MYBPC3	ENST00000399249.6 link	c.994G>A	p.Glu332Lys	missense_variant	Exon 11 of 34	5		ENSP00000382193.2	A8MXZ9
MYBPC3	ENST00000544791.1 link	n.994G>A		non_coding_transcript_exon_variant	Exon 12 of 27	5		ENSP00000444259.1	F5GZR4

Frequencies

GnomAD3 genomes

AF:

0.00000657

AC:

AN:

152216

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.00

Gnomad AMI

AF:

0.00

Gnomad AMR

AF:

0.0000654

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:

0.0000324

AC:

AN:

246592

Hom.:

AF XY:

0.0000299

AC XY:

AN XY:

133988

show subpopulations

Gnomad AFR exome

AF:

0.00

Gnomad AMR exome

AF:

0.000204

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:

0.00000897

Gnomad OTH exome

AF:

0.00

GnomAD4 exome

AF:

0.0000356

AC:

AN:

1460752

Hom.:

Cov.:

AF XY:

0.0000289

AC XY:

AN XY:

726580

show subpopulations

Gnomad4 AFR exome

AF:

0.00

Gnomad4 AMR exome

AF:

0.000179

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:

0.0000387

Gnomad4 OTH exome

AF:

0.0000166

GnomAD4 genome

AF:

0.00000656

AC:

AN:

152334

Hom.:

Cov.:

AF XY:

0.00

AC XY:

AN XY:

74486

show subpopulations

Gnomad4 AFR

AF:

0.00

Gnomad4 AMR

AF:

0.0000653

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

ExAC

AF:

0.00000825

AC:

EpiCase

AF:

0.00

EpiControl

AF:

0.0000595

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:8

Revision: criteria provided, multiple submitters, no conflicts

LINK: link

Submissions by phenotype

not provided

Uncertain:2

Dec 21, 2017

Stanford Center for Inherited Cardiovascular Disease, Stanford University

Significance: Uncertain significance

Review Status: no assertion criteria provided

Collection Method: provider interpretation

We identified this variant in a patient with DCM. Testing was performed at Invitae. SCICD Classification: variant of uncertain significance based on relatively high frequency in the general population, weak case data (and different phenotypes), and variant type. We do not feel it is suitable for assessing risk in healthy relatives ("predictive genetic testing"). Case data (not including our patient): 1 DCM, 1 HCM Pugh et al 2014 - redundant with LMM Clinvar data. Zimmerman 2010 - technical paper on sequencing chip; redundant with LMM ClinVar data. Walsh et al 2016 - reports an additional patient with this variant with HCM tested at Oxford laboratory. Classified as VUS. The supplement also includes the previously reported two LMM DCM cases. Segregation data: none reported Functional data: none reported In silico data (missense variants only): Per the test report, "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." Conservation data: Glu is highly conserved. Nearby pathogenic variants at this codon or neighboring codons: There are other nearby pathogenic variants, but they are nonsense variants, not missense. Population data: Highest MAF in Latino population: 0.02096%. The variant was reported online in 8 of 121912 individuals in the Genome Aggregation Consortium Dataset (gnomAD; http://gnomad.broadinstitute.org/), which currently includes variant calls on >140,000 unrelated individuals of African, Asian, European, Ashkenazi, Latino descent. Specifically, the variant was observed in 7 of 16700 individuals of Latino descent (MAF=0.02%). 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. -

Oct 07, 2016

GeneDx

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

The E332K variant in the MYBPC3 gene has been reported as a variant of uncertain significance in association with DCM (Pugh et al., 2014). Pugh et al. (2014) identified the E332K variant in two unrelated individuals with a clinical and family history of DCM, one of whom also harbored a likely pathogenic variant in the MYH7 gene. The E332K variant has been also reported as a pathogenic variant, but clinical information was not provided (Zimmerman R et al., 2010). The E332K variant was not observed in approximately 6,400 individuals of European and African American ancestry in the NHLBI Exome Sequencing Project, indicating it is not a common benign variant in these populations. The E332K variant is a non-conservative amino acid substitution, which is likely to impact secondary protein structure as these residues differ in polarity, charge, size and/or other properties. This substitution occurs at a position that is conserved across mammals. In silico analysis predicts this variant is probably damaging to the protein structure/function. Therefore, based on the currently available information, it is unclear whether this variant is pathogenic or rare benign. -

Hypertrophic cardiomyopathy

Uncertain:2

Aug 27, 2023

Labcorp Genetics (formerly Invitae), Labcorp

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

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. An algorithm developed to predict the effect of missense changes on protein structure and function (PolyPhen-2) suggests that this variant is likely to be disruptive. ClinVar contains an entry for this variant (Variation ID: 42815). This missense change has been observed in individuals with hypertrophic cardiomyopathy and dilated cardiomyopathy (PMID: 27532257). This variant is present in population databases (rs397516086, gnomAD 0.02%). This sequence change replaces glutamic acid, which is acidic and polar, with lysine, which is basic and polar, at codon 332 of the MYBPC3 protein (p.Glu332Lys). -

Jul 20, 2024

All of Us Research Program, National Institutes of Health

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

This missense variant replaces glutamic acid with lysine at codon 332 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 an individual affected with hypertrophic cardiomyopathy (PMID: 27532257). It has also been reported in individuals affected with dilated cardiomyopathy; one of these individuals also carried a pathogenic variant in the MYH7 gene (PMID: 24503780, 27532257). This variant has been identified in 8/246592 chromosomes in the general population by the Genome Aggregation Database (gnomAD). The available evidence is insufficient to determine the role of this variant in disease conclusively. Therefore, this variant is classified as a Variant of Uncertain Significance. -

not specified

Uncertain:1

Aug 29, 2019

Laboratory for Molecular Medicine, Mass General Brigham Personalized Medicine

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

Variant classified as Uncertain Significance - Favor Benign. The p.Glu332Lys variant in MYBPC3 has been reported in 2 individuals with DCM and 1 individual with HCM, one of whom carried an additional pathogenic variant in MYBPC3 (Walsh 2017, LMM data). It did not segregate with disease in 1 affected family member with DCM (LMM data). It has also been identified in 0.02% (7/34248) of Latino chromosomes by gnomAD (http://gnomad.broadinstitute.org) and reported in ClinVar (Variation ID #42815). Computational prediction tools and conservation analyses suggest that this variant may impact the protein, though this information is not predictive enough to determine pathogenicity. In summary, while the clinical significance of this variant is uncertain, these data suggest that it is more likely to be benign. ACMG/AMP Criteria applied: PP3, BS1_Supporting, BS4. -

Cardiomyopathy

Uncertain:1

Oct 02, 2023

Color Diagnostics, LLC DBA Color Health

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

Hypertrophic cardiomyopathy 4

Uncertain:1

May 28, 2019

Mendelics

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

- -

Cardiovascular phenotype

Uncertain:1

Aug 01, 2021

Ambry Genetics

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

The c.994G>A (p.E332K) alteration is located in exon 12 (coding exon 12) of the MYBPC3 gene. This alteration results from a G to A substitution at nucleotide position 994, causing the glutamic acid (E) at amino acid position 332 to be replaced by a lysine (K). Based on insufficient or conflicting evidence, the clinical significance of this alteration remains unclear. -

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

AlphaMissense

Pathogenic

0.86

CardioboostCm

Uncertain

0.22

BayesDel_addAF

Benign

-0.11

BayesDel_noAF

Benign

-0.12

CADD

Pathogenic

DANN

Pathogenic

1.0

DEOGEN2

Uncertain

0.70

D;T;T

Eigen

Uncertain

0.64

Eigen_PC

Uncertain

0.60

FATHMM_MKL

Pathogenic

0.99

LIST_S2

Pathogenic

0.99

D;D;D

M_CAP

Pathogenic

0.78

MetaRNN

Pathogenic

0.81

D;D;D

MetaSVM

Uncertain

-0.17

MutationAssessor

Pathogenic

3.2

M;.;.

PrimateAI

Pathogenic

0.85

PROVEAN

Uncertain

-3.4

D;D;D

REVEL

Uncertain

0.35

Sift

Uncertain

0.0020

D;D;D

Sift4G

Uncertain

0.0030

D;D;D

Polyphen

0.98

D;.;.

Vest4

0.91

MutPred

0.50

Gain of sheet (P = 0.0085);Gain of sheet (P = 0.0085);Gain of sheet (P = 0.0085);

MVP

0.91

MPC

0.63

ClinPred

0.80

GERP RS

4.7

Varity_R

0.52

gMVP

0.53

Splicing

Name

Calibrated prediction

Score

Prediction

SpliceAI score (max)

0.060

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