rs727504418

Positions:

Variant summary

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

The NM_000256.3(MYBPC3):c.2671C>T(p.Arg891Trp) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.0000185 in 1,564,140 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 (★★). Another variant affecting the same amino acid position, but resulting in a different missense (i.e. R891Q) has been classified as Uncertain significance.

Frequency

Genomes: 𝑓 0.0000066 ( 0 hom., cov: 30)

Exomes 𝑓: 0.000020 ( 0 hom. )

Consequence

MYBPC3
NM_000256.3 missense

Scores

Clinical Significance

Uncertain significance criteria provided, multiple submitters, no conflicts U:9

Conservation

PhyloP100: 1.62

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, 0.824

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
MYBPC3	NM_000256.3 linkuse as main transcript	c.2671C>T	p.Arg891Trp	missense_variant	26/35	ENST00000545968.6

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
MYBPC3	ENST00000545968.6 linkuse as main transcript	c.2671C>T	p.Arg891Trp	missense_variant	26/35	5	NM_000256.3	P4	Q14896-1
MYBPC3	ENST00000399249.6 linkuse as main transcript	c.2671C>T	p.Arg891Trp	missense_variant	25/34	5		A2
MYBPC3	ENST00000544791.1 linkuse as main transcript	c.*176C>T		3_prime_UTR_variant, NMD_transcript_variant	26/27	5

Frequencies

GnomAD3 genomes

AF:

0.00000657

AC:

AN:

152182

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.00

Gnomad AMI

AF:

0.00

Gnomad AMR

AF:

0.00

Gnomad ASJ

AF:

0.00

Gnomad EAS

AF:

0.000193

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:

0.0000263

AC:

AN:

189998

Hom.:

AF XY:

0.0000193

AC XY:

AN XY:

103446

show subpopulations

Gnomad AFR exome

AF:

0.00

Gnomad AMR exome

AF:

0.00

Gnomad ASJ exome

AF:

0.00

Gnomad EAS exome

AF:

0.000148

Gnomad SAS exome

AF:

0.0000424

Gnomad FIN exome

AF:

0.00

Gnomad NFE exome

AF:

0.0000235

Gnomad OTH exome

AF:

0.00

GnomAD4 exome

AF:

0.0000198

AC:

AN:

1411958

Hom.:

Cov.:

AF XY:

0.0000186

AC XY:

AN XY:

698430

show subpopulations

Gnomad4 AFR exome

AF:

0.00

Gnomad4 AMR exome

AF:

0.00

Gnomad4 ASJ exome

AF:

0.00

Gnomad4 EAS exome

AF:

0.000406

Gnomad4 SAS exome

AF:

0.0000378

Gnomad4 FIN exome

AF:

0.00

Gnomad4 NFE exome

AF:

0.00000919

Gnomad4 OTH exome

AF:

0.00

GnomAD4 genome

AF:

0.00000657

AC:

AN:

152182

Hom.:

Cov.:

AF XY:

0.0000135

AC XY:

AN XY:

74338

show subpopulations

Gnomad4 AFR

AF:

0.00

Gnomad4 AMR

AF:

0.00

Gnomad4 ASJ

AF:

0.00

Gnomad4 EAS

AF:

0.000193

Gnomad4 SAS

AF:

0.00

Gnomad4 FIN

AF:

0.00

Gnomad4 NFE

AF:

0.00

Gnomad4 OTH

AF:

0.00

ExAC

AF:

0.0000166

AC:

Asia WGS

AF:

0.000289

AC:

AN:

3478

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:9

Revision: criteria provided, multiple submitters, no conflicts

LINK: link

Submissions by phenotype

not provided

Uncertain:3

Uncertain significance, criteria provided, single submitter	clinical testing	CeGaT Center for Human Genetics Tuebingen	Jun 01, 2020	- -
Uncertain significance, criteria provided, single submitter	clinical testing	GeneDx	Feb 06, 2024	In silico analysis supports that this missense variant has a deleterious effect on protein structure/function; This variant is associated with the following publications: (PMID: 27532257, 32183154, 31447099, Murakami2014, Maeda2009, 32600061, 25611685) -
Uncertain significance, criteria provided, single submitter	clinical testing	Revvity Omics, Revvity	Jun 27, 2023	- -

Hypertrophic cardiomyopathy

Uncertain:2

Uncertain significance, criteria provided, single submitter	clinical testing	Invitae	Aug 09, 2022	This sequence change replaces arginine, which is basic and polar, with tryptophan, which is neutral and slightly polar, at codon 891 of the MYBPC3 protein (p.Arg891Trp). The frequency data for this variant in the population databases is considered unreliable, as metrics indicate poor data quality at this position in the gnomAD database. This missense change has been observed in individual(s) with MYBPC3-related conditions (PMID: 25611685, 27532257, 32183154, 32600061). ClinVar contains an entry for this variant (Variation ID: 177949). 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. 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. -
Uncertain significance, criteria provided, single submitter	clinical testing	All of Us Research Program, National Institutes of Health	Feb 05, 2024	This missense variant replaces arginine with tryptophan at codon 891 of the MYBPC3 protein. Computational prediction is inconclusive regarding the impact of this variant on protein structure and function (internally defined REVEL score threshold 0.5 < inconclusive < 0.7, PMID: 27666373). To our knowledge, functional studies have not been reported for this variant. This variant has been reported in individuals affected with hypertrophic cardiomyopathy (PMID: 25611685, 27532257, 33495597), in individuals affected with dilated cardiomyopathy (PMID: 27532257, DOI:10.1016/j.fsigss.2009.08.094), and in an individual affected with left ventricular noncompaction cardiomyopathy (PMID: 32183154). This variant has been identified in 6/221382 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

Uncertain significance, criteria provided, single submitter

clinical testing

Laboratory for Molecular Medicine, Mass General Brigham Personalized Medicine

May 15, 2019

Variant classified as Uncertain Significance - Favor Pathogenic. The p.Arg891Trp variant in MYBPC3 has been reported in 1 individual with DCM (Maeda 2009) and as a de novo occurrence in 1 infant with HCM (Alfares 2015, LMM data). This variant has also been reported by other clinical laboratories in ClinVar (Variation ID: 177949) and has been identified in 3/14552 East Asian chromosomes by the Genome Aggregation Database (gnomAD, http://gnomad.broadinstitute.org). Computational prediction tools and conservation analysis suggest that the p.Arg891Trp variant may impact the protein, though this information is not predictive enough to determine pathogenicity. In summary, while there is some suspicion for a pathogenic role, the clinical significance of the p.Arg891Trp variant is uncertain. ACMG/AMP Criteria applied: PM2_Supporting, PM6, PP3. -

Cardiomyopathy

Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Color Diagnostics, LLC DBA Color Health

Mar 16, 2023

This missense variant replaces arginine with tryptophan at codon 891 of the MYBPC3 protein. Computational prediction is inconclusive regarding the impact of this variant on protein structure and function (internally defined REVEL score threshold 0.5 < inconclusive < 0.7, PMID: 27666373). To our knowledge, functional studies have not been reported for this variant. This variant has been reported in individuals affected with hypertrophic cardiomyopathy (PMID: 25611685, 27532257, 33495597), in individuals affected with dilated cardiomyopathy (PMID: 27532257, DOI:10.1016/j.fsigss.2009.08.094), and in an individual affected with left ventricular noncompaction cardiomyopathy (PMID: 32183154). This variant has been identified in 6/221382 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. -

Hypertrophic cardiomyopathy 4;C3715165:Left ventricular noncompaction 10

Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Fulgent Genetics, Fulgent Genetics

Apr 01, 2022

- -

Cardiovascular phenotype

Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Ambry Genetics

Apr 15, 2022

The p.R891W variant (also known as c.2671C>T), located in coding exon 26 of the MYBPC3 gene, results from a C to T substitution at nucleotide position 2671. The arginine at codon 891 is replaced by tryptophan, an amino acid with dissimilar properties. This variant has been detected in individuals from cohorts with or referred for genetic testing for dilated cardiomyopathy, hypertrophic cardiomyopathy, and non-compaction cardiomyopathy, and a cohort not selected for the presence of known cardiomyopathy; however details were limited (Maeda K et al. Forensic Sci Int Genetics Suppl Series 2, 2009 499-500, doi:10.1016/j.fsigss.2009.08.094; Alfares AA et al. Genet Med, 2015 Nov;17:880-8; Walsh R et al. Genet Med, 2017 02;19:192-203; Zouk et al. Am J Hum Genet, 2019 09;105:588-605; Hirono K et al. Circ Genom Precis Med, 2020 08;13:e002940; Harper AR et al. Nat Genet, 2021 02;53:135-142). This amino acid position is highly conserved in available vertebrate species. In addition, the in silico prediction for this alteration is inconclusive. Since supporting evidence is limited at this time, the clinical significance of this alteration remains unclear. -

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

AlphaMissense

Benign

0.31

CardioboostCm

Pathogenic

0.93

BayesDel_addAF

Uncertain

0.14

BayesDel_noAF

Uncertain

-0.040

CADD

Uncertain

DANN

Pathogenic

1.0

DEOGEN2

Uncertain

0.43

T;T;T

Eigen

Uncertain

0.47

Eigen_PC

Uncertain

0.31

FATHMM_MKL

Uncertain

0.80

LIST_S2

Pathogenic

0.99

D;D;D

M_CAP

Uncertain

0.21

MetaRNN

Pathogenic

0.82

D;D;D

MetaSVM

Uncertain

0.052

MutationAssessor

Pathogenic

3.4

M;.;.

MutationTaster

Benign

1.0

D;D;D

PrimateAI

Uncertain

0.74

PROVEAN

Pathogenic

-6.5

D;.;D

REVEL

Uncertain

0.51

Sift

Uncertain

0.0010

D;.;D

Sift4G

Pathogenic

0.0010

D;D;D

Vest4

0.96

MVP

0.87

MPC

0.84

ClinPred

0.94

GERP RS

-0.88

Varity_R

0.62

gMVP

0.74

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