rs551119259

Variant summary

Our verdict is Uncertain significance. Variant got 4 ACMG points: 4P and 0B. PM5PP3_Moderate

The NM_000256.3(MYBPC3):c.817C>T(p.Arg273Cys) variant causes a missense change involving the alteration of a conserved nucleotide. The variant allele was found at a frequency of 0.0000121 in 1,566,504 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. R273H) has been classified as Uncertain significance.

Frequency

Genomes: 𝑓 0.000020 ( 0 hom., cov: 32)

Exomes 𝑓: 0.000011 ( 0 hom. )

Consequence

MYBPC3
NM_000256.3 missense

Scores

Clinical Significance

Uncertain significance criteria provided, multiple submitters, no conflicts U:6

Conservation

PhyloP100: 7.75

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 4 ACMG points.

PM5

Other missense variant is known to change same aminoacid residue: Variant chr11-47347860-C-T is described in Lovd as [Likely_pathogenic].

PP3

MetaRNN computational evidence supports a deleterious effect, 0.863

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
MYBPC3	NM_000256.3 linkuse as main transcript	c.817C>T	p.Arg273Cys	missense_variant	7/35	ENST00000545968.6

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
MYBPC3	ENST00000545968.6 linkuse as main transcript	c.817C>T	p.Arg273Cys	missense_variant	7/35	5	NM_000256.3	P4	Q14896-1
MYBPC3	ENST00000399249.6 linkuse as main transcript	c.817C>T	p.Arg273Cys	missense_variant	7/34	5		A2
MYBPC3	ENST00000544791.1 linkuse as main transcript	c.817C>T	p.Arg273Cys	missense_variant, NMD_transcript_variant	7/27	5

Frequencies

GnomAD3 genomes

AF:

0.0000197

AC:

AN:

152182

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.0000241

Gnomad AMI

AF:

0.00

Gnomad AMR

AF:

0.0000655

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:

0.0000147

Gnomad OTH

AF:

0.00

GnomAD3 exomes

AF:

0.0000114

AC:

AN:

175154

Hom.:

AF XY:

0.0000107

AC XY:

AN XY:

93884

show subpopulations

Gnomad AFR exome

AF:

0.00

Gnomad AMR exome

AF:

0.0000378

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:

0.0000136

Gnomad OTH exome

AF:

0.00

GnomAD4 exome

AF:

0.0000113

AC:

AN:

1414204

Hom.:

Cov.:

AF XY:

0.0000143

AC XY:

AN XY:

698950

show subpopulations

Gnomad4 AFR exome

AF:

0.00

Gnomad4 AMR exome

AF:

0.0000268

Gnomad4 ASJ exome

AF:

0.00

Gnomad4 EAS exome

AF:

0.0000272

Gnomad4 SAS exome

AF:

0.0000125

Gnomad4 FIN exome

AF:

0.0000200

Gnomad4 NFE exome

AF:

0.00000735

Gnomad4 OTH exome

AF:

0.0000682

GnomAD4 genome

AF:

0.0000197

AC:

AN:

152300

Hom.:

Cov.:

AF XY:

0.0000134

AC XY:

AN XY:

74466

show subpopulations

Gnomad4 AFR

AF:

0.0000241

Gnomad4 AMR

AF:

0.0000654

Gnomad4 ASJ

AF:

0.00

Gnomad4 EAS

AF:

0.00

Gnomad4 SAS

AF:

0.00

Gnomad4 FIN

AF:

0.00

Gnomad4 NFE

AF:

0.0000147

Gnomad4 OTH

AF:

0.00

Alfa

AF:

0.0000277

Hom.:

Bravo

AF:

0.0000113

ExAC

AF:

0.0000171

AC:

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:6

Revision: criteria provided, multiple submitters, no conflicts

LINK: link

Submissions by phenotype

Hypertrophic cardiomyopathy 4

Uncertain:2

Uncertain significance, criteria provided, single submitter	clinical testing	Centre for Mendelian Genomics, University Medical Centre Ljubljana	Mar 13, 2020	This variant was classified as: Uncertain significance. The available evidence on this variant's pathogenicity is insufficient or conflicting. The following ACMG criteria were applied in classifying this variant: PM2,PP3,BS2. -
Uncertain significance, criteria provided, single submitter	clinical testing	Mendelics	May 28, 2019	- -

Hypertrophic cardiomyopathy

Uncertain:2

Uncertain significance, criteria provided, single submitter	clinical testing	Invitae	Aug 17, 2023	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: 454334). This missense change has been observed in individuals with hypertrophic cardiomyopathy (PMID: 21425739, 28356264). 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 sequence change replaces arginine, which is basic and polar, with cysteine, which is neutral and slightly polar, at codon 273 of the MYBPC3 protein (p.Arg273Cys). -
Uncertain significance, criteria provided, single submitter	clinical testing	All of Us Research Program, National Institutes of Health	Nov 28, 2023	This missense variant replaces arginine with cysteine at codon 273 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 two individuals affected with hypertrophic cardiomyopathy (PMID: 21425739, 28356264) and in an individual affected with sudden cardiac death (PMID: 26688388). This variant has been identified in 2/175154 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. -

Cardiomyopathy

Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Color Diagnostics, LLC DBA Color Health

Apr 24, 2023

This missense variant replaces arginine with cysteine at codon 273 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 two individuals affected with hypertrophic cardiomyopathy (PMID: 21425739, 28356264) and in an individual affected with sudden cardiac death (PMID: 26688388). It has also been reported in an individual affected with long QT syndrome (PMID: 34395343); this individual also carried variant in the KCNQ1 gene. This variant has been identified in 2/175154 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. -

Cardiovascular phenotype

Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Ambry Genetics

Apr 21, 2022

The p.R273C variant (also known as c.817C>T), located in coding exon 7 of the MYBPC3 gene, results from a C to T substitution at nucleotide position 817. The arginine at codon 273 is replaced by cysteine, an amino acid with highly dissimilar properties. This alteration has been reported alone and with alterations in other cardiac-related genes in subjects with hypertrophic cardiomyopathy (HCM), dilated cardiomyopathy (DCM) and prolonged QT (Santos S et al. Rev Port Cardiol, 2011 Jan;30:7-18; Chanavat V et al. Clin Chim Acta, 2016 Jan;453:80-5; Girolami F et al. J Cardiovasc Med (Hagerstown), 2006 Aug;7:601-7; Girolami F et al. J Am Coll Cardiol, 2010 Apr;55:1444-53; Chida A et al. Heart Vessels, 2017 Jun;32:700-707; Sarquella-Brugada G et al. Front Pediatr, 2021 Jul;9:704580). This amino acid position is highly conserved in available vertebrate species. In addition, this alteration is predicted to be deleterious by in silico analysis. 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

Uncertain

0.37

CardioboostCm

Uncertain

0.32

BayesDel_addAF

Pathogenic

0.39

BayesDel_noAF

Pathogenic

0.32

Cadd

Pathogenic

Dann

Pathogenic

1.0

DEOGEN2

Uncertain

0.67

D;T;T

Eigen

Pathogenic

0.71

Eigen_PC

Uncertain

0.66

FATHMM_MKL

Pathogenic

0.99

LIST_S2

Uncertain

0.94

D;D;D

M_CAP

Pathogenic

0.37

MetaRNN

Pathogenic

0.86

D;D;D

MetaSVM

Uncertain

-0.14

MutationAssessor

Pathogenic

3.1

M;.;.

MutationTaster

Benign

1.0

D;D;D

PrimateAI

Uncertain

0.61

PROVEAN

Pathogenic

-4.8

D;D;D

REVEL

Pathogenic

0.69

Sift

Uncertain

0.0010

D;D;D

Sift4G

Pathogenic

0.0

D;D;D

Polyphen

1.0

D;.;.

Vest4

0.80

MutPred

0.77

Loss of disorder (P = 0.0266);Loss of disorder (P = 0.0266);Loss of disorder (P = 0.0266);

MVP

0.90

MPC

0.94

ClinPred

0.99

GERP RS

4.6

Varity_R

0.38

gMVP

0.63

Splicing

Name

Calibrated prediction

Score

Prediction

SpliceAI score (max)

0.030

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