rs375675796

Positions:

Variant summary

Our verdict is Likely pathogenic. Variant got 9 ACMG points: 9P and 0B. PM1PM2PM5PP3_ModeratePP5

The NM_000256.3(MYBPC3):c.2429G>T(p.Arg810Leu) variant causes a missense change involving the alteration of a conserved nucleotide. The variant allele was found at a frequency of 0.00000124 in 1,613,848 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 Conflicting classifications of pathogenicity (no stars). Another variant affecting the same amino acid position, but resulting in a different missense (i.e. R810H) has been classified as Pathogenic.

Frequency

Genomes: 𝑓 0.0000066 ( 0 hom., cov: 31)

Exomes 𝑓: 6.8e-7 ( 0 hom. )

Consequence

MYBPC3
NM_000256.3 missense

Scores

Clinical Significance

Conflicting classifications of pathogenicity criteria provided, conflicting classifications P:2U:2

Conservation

PhyloP100: 7.57

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 Likely_pathogenic. Variant got 9 ACMG points.

PM1

In a domain Fibronectin type-III 1 (size 96) in uniprot entity MYPC3_HUMAN there are 31 pathogenic changes around while only 3 benign (91%) in NM_000256.3

PM2

Very rare variant in population databases, with high coverage;

PM5

Other missense variant is known to change same aminoacid residue: Variant chr11-47337564-C-T is described in Lovd as [Pathogenic].

PP3

MetaRNN computational evidence supports a deleterious effect, 0.883

PP5

Variant 11-47337564-C-A is Pathogenic according to our data. Variant chr11-47337564-C-A is described in ClinVar as [Conflicting_classifications_of_pathogenicity]. Clinvar id is 181127.We mark this variant Likely_pathogenic, oryginal submissions are: {Likely_pathogenic=2, Uncertain_significance=2}. Variant chr11-47337564-C-A is described in Lovd as [Pathogenic].

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
MYBPC3	NM_000256.3 linkuse as main transcript	c.2429G>T	p.Arg810Leu	missense_variant	25/35	ENST00000545968.6	NP_000247.2

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
MYBPC3	ENST00000545968.6 linkuse as main transcript	c.2429G>T	p.Arg810Leu	missense_variant	25/35	5	NM_000256.3	ENSP00000442795	P4	Q14896-1
MYBPC3	ENST00000399249.6 linkuse as main transcript	c.2429G>T	p.Arg810Leu	missense_variant	24/34	5		ENSP00000382193	A2
MYBPC3	ENST00000544791.1 linkuse as main transcript	c.2414-53G>T		intron_variant, NMD_transcript_variant		5		ENSP00000444259

Frequencies

GnomAD3 genomes

AF:

0.00000657

AC:

AN:

152184

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

GnomAD4 exome

AF:

6.84e-7

AC:

AN:

1461664

Hom.:

Cov.:

AF XY:

0.00000138

AC XY:

AN XY:

727108

show subpopulations

Gnomad4 AFR exome

AF:

0.00

Gnomad4 AMR exome

AF:

0.00

Gnomad4 ASJ exome

AF:

0.00

Gnomad4 EAS exome

AF:

0.00

Gnomad4 SAS exome

AF:

0.00

Gnomad4 FIN exome

AF:

0.00

Gnomad4 NFE exome

AF:

8.99e-7

Gnomad4 OTH exome

AF:

0.00

GnomAD4 genome

AF:

0.00000657

AC:

AN:

152184

Hom.:

Cov.:

AF XY:

0.00

AC XY:

AN XY:

74334

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

Bravo

AF:

0.00000378

ClinVar

Significance: Conflicting classifications of pathogenicity

Submissions summary: Pathogenic:2Uncertain:2

Revision: criteria provided, conflicting classifications

LINK: link

Submissions by phenotype

Primary familial hypertrophic cardiomyopathy

Pathogenic:1

Likely pathogenic, criteria provided, single submitter

clinical testing

Molecular Diagnostic Laboratory for Inherited Cardiovascular Disease, Montreal Heart Institute

Jun 16, 2017

- -

Cardiovascular phenotype

Pathogenic:1

Likely pathogenic, criteria provided, single submitter

clinical testing

Ambry Genetics

Feb 13, 2018

The p.R810L variant (also known as c.2429G>T), located in coding exon 25 of the MYBPC3 gene, results from a G to T substitution at nucleotide position 2429. The arginine at codon 810 is replaced by leucine, an amino acid with dissimilar properties. This variant has been reported in several unrelated individuals with hypertrophic cardiomyopathy (HCM), although in one case other alterations were also detected (Millat G et al. Eur J Med Genet 2010 Jul; 53(5):261-7; Olivotto I et al. J. Am. Coll. Cardiol. 2011 Aug; 58(8):839-48). Additionally, another variant affecting the same amino acid, p.R810H (c.2429G>A), has also been identified in multiple HCM cases, though some individuals were positive for other cardiac variants as well (Nanni et al. Biochem Biophys Res Commun. 2003;309(2):391-8; Maron et al. Am J Cardiol. 2011;107(4):604-8; Roncarati et al. Cell Physiol. 2011;226(11):2894-900). This amino acid position is highly conserved in available vertebrate species. In addition, this alteration is predicted to be deleterious by in silico analysis. Based on the majority of available evidence to date, this variant is likely to be pathogenic. -

not provided

Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

GeneDx

Jan 17, 2024

The R810L likely pathogenic variant in the MYBPC3 gene has been previously published in association with HCM (Millat et al., 2010; Olivotto et al., 2011). Millat et al. (2010) originally reported R810L in an individual with HCM who also harbored a second variant (R1022P) in the MYBPC3 gene. Olivotto et al. (2011) identified R810L independently in an individual with HCM. The R810L variant is not observed in large population cohorts (Lek et al., 2016; 1000 Genomes Consortium et al., 2015; Exome Variant Server). R810L 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. Moreover, this substitution occurs at a position that is conserved across species, and in silico analysis predicts this variant is probably damaging to the protein structure/function. Lastly, a missense variant in the same residue (R810H) and missense variants in nearby residues (G805S, I807N, K811R) have been reported in Human Gene Mutation Database in association with HCM (Stenson et al., 2014), further supporting the functional importance of this residue and region of the protein. -

Hypertrophic cardiomyopathy

Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Labcorp Genetics (formerly Invitae), Labcorp

Jul 07, 2023

This sequence change replaces arginine, which is basic and polar, with leucine, which is neutral and non-polar, at codon 810 of the MYBPC3 protein (p.Arg810Leu). This variant is not present in population databases (gnomAD no frequency). This missense change has been observed in individual(s) with hypertrophic cardiomyopathy (HCM) (PMID: 20624503, 21835320). ClinVar contains an entry for this variant (Variation ID: 181127). 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. This variant disrupts the p.Arg810 amino acid residue in MYBPC3. Other variant(s) that disrupt this residue have been determined to be pathogenic (PMID: 15519027, 25524337, 27483260, 28615295; Invitae). This suggests that this residue is clinically significant, and that variants that disrupt this residue are likely to be disease-causing. 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. -

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

AlphaMissense

Pathogenic

0.76

CardioboostCm

Pathogenic

0.98

BayesDel_addAF

Pathogenic

0.31

BayesDel_noAF

Pathogenic

0.21

CADD

Pathogenic

DANN

Uncertain

1.0

DEOGEN2

Uncertain

0.47

T;T;T

Eigen

Pathogenic

0.80

Eigen_PC

Pathogenic

0.74

FATHMM_MKL

Uncertain

0.95

LIST_S2

Pathogenic

1.0

D;D;D

M_CAP

Pathogenic

0.32

MetaRNN

Pathogenic

0.88

D;D;D

MetaSVM

Uncertain

-0.19

MutationAssessor

Uncertain

2.8

M;.;.

MutationTaster

Benign

1.0

D;D;D

PrimateAI

Uncertain

0.72

PROVEAN

Pathogenic

-6.4

D;.;D

REVEL

Pathogenic

0.67

Sift

Uncertain

0.0010

D;.;D

Sift4G

Uncertain

0.0040

D;D;D

Vest4

0.95

MVP

0.87

MPC

0.93

ClinPred

1.0

GERP RS

4.6

Varity_R

0.71

gMVP

0.86

Splicing

Name

Calibrated prediction

Score

Prediction

SpliceAI score (max)

0.020

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