NM_000256.3:c.2048G>A

Variant names:

Variant summary

Our verdict is Pathogenic. The variant received 18 ACMG points: 18P and 0B. PVS1PM2PP5_Very_Strong

The NM_000256.3(MYBPC3):c.2048G>A(p.Trp683*) variant causes a stop gained change involving the alteration of a conserved nucleotide. The variant allele was found at a frequency of 0.000000687 in 1,455,614 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 Pathogenic (★★). Variant results in nonsense mediated mRNA decay.

Frequency

Genomes: not found (cov: 33)

Exomes 𝑓: 6.9e-7 ( 0 hom. )

Consequence

MYBPC3
NM_000256.3 stop_gained

Scores

Clinical Significance

Pathogenic criteria provided, multiple submitters, no conflicts P:3

Conservation

PhyloP100: 7.39

Publications

5 publications found

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 Gene-Disease associations (from GenCC):

hypertrophic cardiomyopathy
Inheritance: AD Classification: DEFINITIVE Submitted by: ClinGen
hypertrophic cardiomyopathy 4
Inheritance: AD, AR Classification: DEFINITIVE, STRONG Submitted by: Ambry Genetics, G2P, Labcorp Genetics (formerly Invitae)
left ventricular noncompaction 10
Inheritance: AR, AD Classification: DEFINITIVE, MODERATE, LIMITED Submitted by: Ambry Genetics
familial isolated dilated cardiomyopathy
Inheritance: AD Classification: SUPPORTIVE Submitted by: Orphanet
arrhythmogenic right ventricular cardiomyopathy
Inheritance: AD Classification: LIMITED Submitted by: ClinGen
atrial fibrillation
Inheritance: AD Classification: LIMITED Submitted by: Ambry Genetics
dilated cardiomyopathy
Inheritance: AD Classification: LIMITED Submitted by: ClinGen

MYBPC3 links:

Genome browser will be placed here

ACMG classification

Classification was made for transcript

Our verdict: Pathogenic. The variant received 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 11-47339670-C-T is Pathogenic according to our data. Variant chr11-47339670-C-T is described in ClinVar as Pathogenic. ClinVar VariationId is 42591.Status of the report is criteria_provided_multiple_submitters_no_conflicts, 2 stars.

Variant Effect in Transcripts

ACMG analysis was done for transcript: NM_000256.3. You can select a different transcript below to see updated ACMG assignments.

RefSeq Transcripts

Selected	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	MYBPC3	NM_000256.3	MANE Select	c.2048G>A	p.Trp683*	stop_gained	Exon 21 of 35	NP_000247.2

Ensembl Transcripts

Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein
MYBPC3	ENST00000545968.6	TSL:5 MANE Select	c.2048G>A	p.Trp683*	stop_gained	Exon 21 of 35	ENSP00000442795.1
MYBPC3	ENST00000399249.6	TSL:5	c.2048G>A	p.Trp683*	stop_gained	Exon 20 of 34	ENSP00000382193.2
MYBPC3	ENST00000544791.1	TSL:5	n.2048G>A		non_coding_transcript_exon	Exon 21 of 27	ENSP00000444259.1

Frequencies

GnomAD3 genomes

Cov.:

GnomAD4 exome

AF:

6.87e-7

AC:

AN:

1455614

Hom.:

Cov.:

AF XY:

0.00000138

AC XY:

AN XY:

723470

show subpopulations

African (AFR)

AF:

0.00

AC:

AN:

33392

American (AMR)

AF:

0.00

AC:

AN:

43608

Ashkenazi Jewish (ASJ)

AF:

0.00

AC:

AN:

25928

East Asian (EAS)

AF:

0.00

AC:

AN:

39520

South Asian (SAS)

AF:

0.00

AC:

AN:

85532

European-Finnish (FIN)

AF:

0.00

AC:

AN:

53198

Middle Eastern (MID)

AF:

0.00

AC:

AN:

5754

European-Non Finnish (NFE)

AF:

9.02e-7

AC:

AN:

1108548

Other (OTH)

AF:

0.00

AC:

AN:

60134

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.575

Heterozygous variant carriers

0.00

0.20

0.40

0.60

0.80

0.95

Allele balance

Age Distribution

Exome Het

Variant carriers

<30

30-35

35-40

40-45

45-50

50-55

55-60

60-65

65-70

70-75

75-80

>80

Age

GnomAD4 genome

Cov.:

Alfa

AF:

0.00

Hom.:

ClinVar

Significance: Pathogenic

Submissions summary: Pathogenic:3

Revision: criteria provided, multiple submitters, no conflicts

LINK: link

Submissions by phenotype

Hypertrophic cardiomyopathy

Pathogenic:2

Dec 09, 2011

Laboratory for Molecular Medicine, Mass General Brigham Personalized Medicine

Significance:Pathogenic

Review Status:criteria provided, single submitter

Collection Method:clinical testing

The Trp683X variant has been reported in 1 individual with HCM and was absent fr om 200 control chromosomes (Richard 2003). This variant leads to a premature sto p at codon 683. This alteration is predicted to lead to a truncated or absent pr otein. Loss of function of the MYBPC3 gene is an established disease mechanism i n HCM patients, which makes it highly likely that the Trp683X variant is pathoge nic.

Nov 21, 2020

Labcorp Genetics (formerly Invitae), Labcorp

Significance:Pathogenic

Review Status:criteria provided, single submitter

Collection Method:clinical testing

This variant has been observed in several individuals affected with hypertrophic cardiomyopathy (PMID: 12707239, 27532257, 25228707). ClinVar contains an entry for this variant (Variation ID: 42591). Algorithms developed to predict the effect of sequence changes on RNA splicing suggest that this variant may create or strengthen a splice site, but this prediction has not been confirmed by published transcriptional studies. For these reasons, this variant has been classified as Pathogenic. This variant is not present in population databases (ExAC no frequency). This sequence change creates a premature translational stop signal (p.Trp683*) in the MYBPC3 gene. It is expected to result in an absent or disrupted protein product. Loss-of-function variants in MYBPC3 are known to be pathogenic (PMID: 19574547).

not provided

Pathogenic:1

Jan 18, 2012

Stanford Center for Inherited Cardiovascular Disease, Stanford University

Significance:Likely pathogenic

Review Status:no assertion criteria provided

Collection Method:clinical testing

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. p.Trp683X ( c.2048G>A) in MYBPC3 Given the strong evidence that nonsense variants in MYBPC3 cause HCM, we consider this variant likely disease-causing, with sufficient confidence to use it for predictive genetic testing in the family. The variant has been seen in at least one case of HCM (not including the patient's family). There is no segregation data available. Richard et al (2003) reported the variant in a patient with HCM from their French cohort. Nonsense variants in the MYBPC3 gene are a frequent cause of HCM (ex. p.Gln76Stop, p.Tyr79Stop, p.Gly115Stop, p.Pro161Stop, p.Gln425Stop) as are splicing and frameshift variants (see http://genepath.med.harvard.edu, www.biobaseinternational.com/pages). In total the variant has not been seen in ~6000 published controls and publicly available population datasets. This variant is not listed in the NHLBI Exome Sequencing Project dataset, which currently includes variant calls on ~6000 Caucasian and African American individuals (as of 6/20/2012). Of note, there is only one frameshift or nonsense variant listed in that entire cohort. The variant was not observed in the following published control samples: 100 (Richard et al 2003).

Computational scores

Source: dbNSFP v4.9

Name

Calibrated prediction

Score

Prediction

BayesDel_addAF

Pathogenic

0.62

BayesDel_noAF

Pathogenic

0.65

CADD

Pathogenic

(source)

DANN

Uncertain

0.99

Eigen

Pathogenic

0.90

Eigen_PC

Pathogenic

0.76

FATHMM_MKL

Pathogenic

0.98

PhyloP100

7.4

Vest4

0.81

GERP RS

4.9

Mutation Taster

=0/200

disease causing (ClinVar)

(source)

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

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Variant summary

Frequency

Consequence

Scores

Clinical Significance

Conservation

Publications

ACMG classification

Variant Effect in Transcripts

RefSeq Transcripts

Ensembl Transcripts

Frequencies

Age Distribution

ClinVar

Submissions by phenotype

Computational scores

Splicing

Publications

Other links and lift over