rs773819168

chr11-47335164-G-Achr11-47335164-G-T

Variant summary

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

The NM_000256.3(MYBPC3):c.2783C>T(p.Ser928Leu) variant causes a missense change involving the alteration of a conserved nucleotide. The variant allele was found at a frequency of 0.0000552 in 1,612,436 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 (★★). Synonymous variant affecting the same amino acid position (i.e. S928S) has been classified as Likely benign.

• Frequency:
  • Genomes: 𝑓 0.000033 (0 hom., cov: 33)
  • Exomes 𝑓: 0.000058 (0 hom.)
• Consequence: MYBPC3 NM_000256.3 missense
• Clinical Significance: Uncertain significance criteria provided, multiple submitters, no conflicts U:13
• Conservation: PhyloP100: 9.58

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]

ACMG classification

Verdict is Uncertain_significance. Variant got 1 ACMG points.

• PP3: MetaRNN computational evidence supports a deleterious effect, 0.784

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
MYBPC3	NM_000256.3	c.2783C>T	p.Ser928Leu	missense_variant	27/35	ENST00000545968.6

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
MYBPC3	ENST00000545968.6	c.2783C>T	p.Ser928Leu	missense_variant	27/35	5	NM_000256.3	P4
MYBPC3	ENST00000399249.6	c.2783C>T	p.Ser928Leu	missense_variant	26/34	5		A2

Frequencies

GnomAD3 genomes AF: 0.0000329 AC: 5 AN: 152204 Hom.: 0 Cov.: 33

Gnomad AFR AF: 0.00

Gnomad AMI AF: 0.00

Gnomad AMR AF: 0.00

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: 0.0000588

Gnomad OTH AF: 0.000478

GnomAD3 exomes AF: 0.0000242 AC: 6 AN: 247572 Hom.: 0 AF XY: 0.0000223 AC XY: 3 AN XY: 134426

Gnomad AFR exome AF: 0.00

Gnomad AMR exome AF: 0.0000583

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: 0.0000357

Gnomad OTH exome AF: 0.00

GnomAD4 exome AF: 0.0000575 AC: 84 AN: 1460232 Hom.: 0 Cov.: 31 AF XY: 0.0000578 AC XY: 42 AN XY: 726358

Gnomad4 AFR exome AF: 0.00

Gnomad4 AMR exome AF: 0.0000448

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: 0.0000738

Gnomad4 OTH exome AF: 0.00

GnomAD4 genome AF: 0.0000329 AC: 5 AN: 152204 Hom.: 0 Cov.: 33 AF XY: 0.0000404 AC XY: 3 AN XY: 74346

Gnomad4 AFR AF: 0.00

Gnomad4 AMR AF: 0.00

Gnomad4 ASJ AF: 0.00

Gnomad4 EAS AF: 0.00

Gnomad4 SAS AF: 0.00

Gnomad4 FIN AF: 0.00

Gnomad4 NFE AF: 0.0000588

Gnomad4 OTH AF: 0.000478

Alfa AF: 0.0000565 Hom.: 0

Bravo AF: 0.0000151

ExAC AF: 0.00000827 AC: 1

EpiCase AF: 0.000110

EpiControl AF: 0.00

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:13

Revision: criteria provided, multiple submitters, no conflicts

Submissions by phenotype

not provided Uncertain:4

Uncertain significance, no assertion criteria provided	clinical testing	Clinical Genetics, Academic Medical Center	-	- -
Uncertain significance, criteria provided, single submitter	clinical testing	GeneDx	Sep 21, 2022	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: 24111713, 22857948, 25214167, 33782553, 29853478, 31323898, 32369506, 16335287, 30847666) -
Uncertain significance, no assertion criteria provided	clinical testing	Genome Diagnostics Laboratory, University Medical Center Utrecht	-	- -
Uncertain significance, no assertion criteria provided	clinical testing	Joint Genome Diagnostic Labs from Nijmegen and Maastricht, Radboudumc and MUMC+	-	- -

Hypertrophic cardiomyopathy Uncertain:2

Uncertain significance, criteria provided, single submitter	clinical testing	Invitae	Aug 23, 2022	This sequence change replaces serine, which is neutral and polar, with leucine, which is neutral and non-polar, at codon 928 of the MYBPC3 protein (p.Ser928Leu). 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 individuals with hypertrophic cardiomyopathy (PMID: 16335287, 22857948, 24111713, 33782553; Invitae). ClinVar contains an entry for this variant (Variation ID: 427958). Algorithms developed to predict the effect of missense changes on protein structure and function are either unavailable or do not agree on the potential impact of this missense change (SIFT: "Deleterious"; PolyPhen-2: "Possibly Damaging"; Align-GVGD: "Class C15"). 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	Nov 30, 2023	This missense variant replaces serine with leucine at codon 928 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 individuals affected with hypertrophic cardiomyopathy (PMID: 24111713, 22857948, 31323898). One of these individuals also carried a pathogenic variant in the MYH7 gene that could explain the observed phenotype (PMID: 22857948). This variant has been identified in 6/247572 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

Women's Health and Genetics/Laboratory Corporation of America, LabCorp

Feb 12, 2019

Variant summary: MYBPC3 c.2783C>T (p.Ser928Leu) results in a non-conservative amino acid change located in the Fibronectin type III domain of the encoded protein sequence. Three of five in-silico tools predict a benign effect of the variant on protein function. The variant allele was found at a frequency of 2.5e-05 in 244814 control chromosomes (gnomAD). The available data on variant occurrences in the general population are insufficient to allow any conclusion about variant significance. c.2783C>T has been reported in the literature in affected individuals (Berge_2014, Brito_2012, Brito_2005). These reports do not provide unequivocal conclusions about association of the variant with Cardiomyopathy. Co-occurrences with other pathogenic variants have been reported (MYBPC3 c.2373dupG, p.W792VfsX41; MYH7 c.788T>C, p.Ile263Thr) (Berge_2014, Brito_2012). To our knowledge, no experimental evidence demonstrating an impact on protein function has been reported. Two ClinVar submissions from clinical diagnostic laboratories (evaluation after 2014) cite the variant as uncertain significance. Based on the evidence outlined above, the variant was classified as VUS-possibly benign. -

Prolonged QT interval Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Center for Human Genetics, University of Leuven

Apr 30, 2017

- -

Left ventricular noncompaction 10 Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Illumina Laboratory Services, Illumina

Apr 28, 2017

This variant was observed as part of a predisposition screen in an ostensibly healthy population. A literature search was performed for the gene, cDNA change, and amino acid change (where applicable). No publications were found based on this search. Allele frequency data from public databases did not allow this variant to be ruled in or out of causing disease. Therefore, this variant is classified as a variant of unknown significance. -

Hypertrophic cardiomyopathy 4;C3715165:Left ventricular noncompaction 10 Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Fulgent Genetics, Fulgent Genetics

Oct 11, 2021

- -

Cardiomyopathy Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Color Diagnostics, LLC DBA Color Health

Mar 16, 2023

This missense variant replaces serine with leucine at codon 928 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 individuals affected with hypertrophic cardiomyopathy (PMID: 24111713, 22857948, 31323898). One of these individuals also carried a pathogenic variant in the MYH7 gene that could explain the observed phenotype (PMID: 22857948). This variant has been identified in 6/247572 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 Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Illumina Laboratory Services, Illumina

Apr 28, 2017

This variant was observed as part of a predisposition screen in an ostensibly healthy population. A literature search was performed for the gene, cDNA change, and amino acid change (where applicable). Publications were found based on this search. However, the evidence from the literature, in combination with allele frequency data from public databases where available, was not sufficient to rule this variant in or out of causing disease. Therefore, this variant is classified as a variant of unknown significance. -

Cardiovascular phenotype Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Ambry Genetics

Apr 18, 2023

The p.S928L variant (also known as c.2783C>T), located in coding exon 27 of the MYBPC3 gene, results from a C to T substitution at nucleotide position 2783. The serine at codon 928 is replaced by leucine, an amino acid with dissimilar properties. This variant has been detected in hypertrophic cardiomyopathy (HCM) cohorts and individuals with HCM; however, it co-occurred with pathogenic mutations in cardiomyopathy-related genes in at least two cases, and cohort reports may overlap (Brito D et al. Rev Port Cardiol, 2005 Sep;24:1137-46; Brito D et al. Rev Port Cardiol, 2012 Sep;31:577-87; Berge KE et al. Clin. Genet., 2014 Oct;86:355-60; Nijenkamp LLAM et al. Circ Heart Fail. 2018 06;11(6):e004133; Helms AS et al. Circ Genom Precis Med. 2020 Oct;13(5):396-405; Harper AR et al. Nat Genet. 2021 Feb;53(2):135-142). This variant has also been detected in an individual reported to have long QT syndrome, and in an individual who underwent genetic testing for dilated cardiomyopathy; however, clinical details were limited (Robyns T et al. Eur. J. Hum. Genet. 2017 12;25(12):1313-1323; van Lint FHM et al. Neth Heart J, 2019 Jun;27:304-309). This amino acid position is well 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	Uncertain	0.49
CardioboostCm	Benign	0.0029
BayesDel_addAF	Uncertain	0.037	T
BayesDel_noAF	Uncertain	-0.010
Cadd	Uncertain	25
Dann	Uncertain	1.0
DEOGEN2	Benign	0.36	T;T;T
Eigen	Uncertain	0.26
Eigen_PC	Uncertain	0.29
FATHMM_MKL	Pathogenic	0.99	D
LIST_S2	Uncertain	0.88	D;D;D
M_CAP	Uncertain	0.23	D
MetaRNN	Pathogenic	0.78	D;D;D
MetaSVM	Benign	-0.55	T
MutationAssessor	Pathogenic	3.2	M;.;.
MutationTaster	Benign	1.0	D;D;D
PrimateAI	Uncertain	0.52	T
PROVEAN	Uncertain	-3.9	D;.;D
REVEL	Uncertain	0.39
Sift	Benign	0.10	T;.;T
Sift4G	Benign	0.13	T;T;T
Vest4		0.76
MVP		0.91
MPC		0.63
ClinPred		0.89	D
GERP RS		5.3
Varity_R		0.48
gMVP		0.64

Splicing

Name	Calibrated prediction	Score	Prediction
SpliceAI score (max)		0.070		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

Other links and lift over

dbSNP: rs773819168; hg19: chr11-47356715; COSMIC: COSV57027914; COSMIC: COSV57027914;