rs199893357

Positions:

Variant summary

Our verdict is Uncertain significance. Variant got 1 ACMG points: 2P and 1B. PM1BP4

The NM_000256.3(MYBPC3):c.2210C>T(p.Thr737Met) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.000174 in 1,613,854 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. Variant has been reported in ClinVar as Conflicting classifications of pathogenicity (no stars).

Frequency

Genomes: 𝑓 0.00016 ( 0 hom., cov: 32)

Exomes 𝑓: 0.00018 ( 0 hom. )

Consequence

MYBPC3
NM_000256.3 missense

Scores

Clinical Significance

Conflicting classifications of pathogenicity criteria provided, conflicting classifications U:11B:1

Conservation

PhyloP100: 3.09

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.

PM1

In a strand (size 4) in uniprot entity MYPC3_HUMAN there are 4 pathogenic changes around while only 0 benign (100%) in NM_000256.3

BP4

Computational evidence support a benign effect (MetaRNN=0.3763353).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
MYBPC3	NM_000256.3 linkuse as main transcript	c.2210C>T	p.Thr737Met	missense_variant	23/35	ENST00000545968.6	NP_000247.2	Q14896-1A5YM48

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	UniProt
MYBPC3	ENST00000545968.6 linkuse as main transcript	c.2210C>T	p.Thr737Met	missense_variant	23/35	5	NM_000256.3	ENSP00000442795.1	Q14896-1
MYBPC3	ENST00000399249.6 linkuse as main transcript	c.2210C>T	p.Thr737Met	missense_variant	22/34	5		ENSP00000382193.2	A8MXZ9
MYBPC3	ENST00000544791.1 linkuse as main transcript	n.2210C>T		non_coding_transcript_exon_variant	23/27	5		ENSP00000444259.1	F5GZR4

Frequencies

GnomAD3 genomes

AF:

0.000158

AC:

AN:

152196

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.000145

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:

0.000250

Gnomad OTH

AF:

0.000478

GnomAD3 exomes

AF:

0.0000603

AC:

AN:

248960

Hom.:

AF XY:

0.0000666

AC XY:

AN XY:

135128

show subpopulations

Gnomad AFR exome

AF:

0.0000646

Gnomad AMR exome

AF:

0.00

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:

0.000124

Gnomad OTH exome

AF:

0.00

GnomAD4 exome

AF:

0.000176

AC:

257

AN:

1461658

Hom.:

Cov.:

AF XY:

0.000166

AC XY:

121

AN XY:

727120

show subpopulations

Gnomad4 AFR exome

AF:

0.0000299

Gnomad4 AMR exome

AF:

0.0000224

Gnomad4 ASJ exome

AF:

0.00

Gnomad4 EAS exome

AF:

0.00

Gnomad4 SAS exome

AF:

0.00

Gnomad4 FIN exome

AF:

0.0000187

Gnomad4 NFE exome

AF:

0.000201

Gnomad4 OTH exome

AF:

0.000497

GnomAD4 genome

AF:

0.000158

AC:

AN:

152196

Hom.:

Cov.:

AF XY:

0.000161

AC XY:

AN XY:

74334

show subpopulations

Gnomad4 AFR

AF:

0.000145

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:

0.000250

Gnomad4 OTH

AF:

0.000478

Alfa

AF:

0.000135

Hom.:

Bravo

AF:

0.000106

ESP6500AA

AF:

0.00

AC:

ESP6500EA

AF:

0.000238

AC:

ExAC

AF:

0.0000496

AC:

EpiCase

AF:

0.000382

EpiControl

AF:

0.000119

ClinVar

Significance: Conflicting classifications of pathogenicity

Submissions summary: Uncertain:11Benign:1

Revision: criteria provided, conflicting classifications

LINK: link

Submissions by phenotype

not provided

Uncertain:3

Uncertain significance, criteria provided, single submitter	clinical testing	GeneDx	Apr 11, 2024	Identified in patients with cardiomyopathy in published literature (PMID: 22958901, 31983221, 27532257, 33782553, 23861362, Rippert et al., 2023, 37652022, 32841044, 33495597); In silico analysis indicates that this missense variant does not alter protein structure/function; This variant is associated with the following publications: (PMID: 22958901, 23861362, 21310275, 31983221, 32746448, 33782553, 27532257, 32841044, Rippert2023[article], 37652022, 33495597) -
Uncertain significance, criteria provided, single submitter	clinical testing	Mayo Clinic Laboratories, Mayo Clinic	Feb 10, 2022	BP4 -
Uncertain significance, criteria provided, single submitter	research	Biesecker Lab/Clinical Genomics Section, National Institutes of Health	Jun 24, 2013	- -

not specified

Uncertain:2

Uncertain significance, no assertion criteria provided	clinical testing	Stanford Center for Inherited Cardiovascular Disease, Stanford University	Jan 31, 2014	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.Thr737Met in MYBPC3 The p.Thr737Met variant is novel. The c.2210C>T substitution was identified in exon 23 of MYBPC3, resulting in a non-conservative amino acid substitution of a polar neutral threonine with non-polar neutral methionine. The threonine residue is conserved across other mammalian species. In silico analysis with PolyPhen2 predicts the variant to be probably damaging. A variant has been reported in association with HCM at a nearby codon (p.Arg733Cys, Van Driest et al 2004). In total the variant has not been seen in ~4 of ~7,134 laboratory controls and individuals from publicly available population datasets. The variant was recently reported online in 2 of 4197 Caucasian individuals and 0 of 2077 African-American individuals in the NHLBI Exome Sequencing Project dataset (as of April 9th, 2012). The phenotype of those individuals is not publicly available, however the cohorts that were merged to create this dataset were all either general population samples or samples recruited for common cardiovascular disease such as hypertension. Of note, other variants with strong evidence for pathogenicity have been seen in this dataset at a similar frequency, so this does not necessarily mean that the variant is not pathogenic. The variant is also listed in dbSNP (rs199893357) with note that it was observed in 2 of ~560 individuals in the NHGRI ClinSeq cohort. 1000 genomes lists the variant, but only in reference to the dbSNP entry. The p.Thr737Met variant was not detected in up to 300 individuals of Caucasian and African American ancestry tested at GeneDx. The pathogenicity of this novel variant is currently uncertain. It may contribute to the patient’s cardiomyopathy or it may be a rare benign variant. -
Uncertain significance, criteria provided, single submitter	clinical testing	Laboratory for Molecular Medicine, Mass General Brigham Personalized Medicine	Jul 28, 2011	The Thr737Met variant in MYBPC3 has not been reported in the literature though i t has been identified in 1 individual with HCM out of >1900 Caucasian probands ( 3800 chromosomes) tested by our laboratory. This low frequency is consistent wit h a pathogenic role. However, threonine (Thr) at position 737 is not completely conserved in evolution, suggesting that a change may be tolerated. Furthermore, this variant was predicted to be benign using a novel computational tool, which was validated by our laboratory using a set of cardiomyopathy variants with well -established clinical significance. This tool's benign interpretation is estimat ed to be correct 89% of the time, which suggests but does not prove that this va riant is benign (Jordan 2011). In summary, the clinical significance of this var iant cannot be determined without additional studies. -

Cardiomyopathy

Uncertain:2

Uncertain significance, criteria provided, single submitter	clinical testing	Color Diagnostics, LLC DBA Color Health	Nov 20, 2023	This missense variant replaces threonine with methionine at codon 737 of the MYBPC3 protein. Computational prediction suggests that this variant may have a neutral impact protein structure and function. To our knowledge, functional studies have not been reported for this variant. This variant has been reported in five individuals affected with hypertrophic cardiomyopathy (PMID: 27532257, 32841044, 33495597). This variant has also been reported in two individuals affected with dilated cardiomyopathy (PMID: 31983221 and 32746448). This variant has also been identified in 21/280356 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. -
Uncertain significance, criteria provided, single submitter	clinical testing	CHEO Genetics Diagnostic Laboratory, Children's Hospital of Eastern Ontario	May 31, 2021	- -

Hypertrophic cardiomyopathy

Uncertain:2

Uncertain significance, criteria provided, single submitter	clinical testing	All of Us Research Program, National Institutes of Health	Sep 23, 2024	This missense variant replaces threonine with methionine at codon 737 of the MYBPC3 protein. Computational prediction suggests that this variant may have a neutral impact protein structure and function. To our knowledge, functional studies have not been reported for this variant. This variant has been reported in five individuals affected with hypertrophic cardiomyopathy (PMID: 27532257, 32841044, 33495597). This variant has also been reported in two individuals affected with dilated cardiomyopathy (PMID: 31983221 and 32746448). This variant has also been identified in 21/280356 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. -
Uncertain significance, criteria provided, single submitter	clinical testing	Labcorp Genetics (formerly Invitae), Labcorp	Jan 31, 2024	This sequence change replaces threonine, which is neutral and polar, with methionine, which is neutral and non-polar, at codon 737 of the MYBPC3 protein (p.Thr737Met). This variant is present in population databases (rs199893357, gnomAD 0.01%). This missense change has been observed in individuals with clinical features of MYBPC3-related conditions (PMID: 27532257, 31983221, 32746448, 33782553; Invitae). ClinVar contains an entry for this variant (Variation ID: 42608). 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 tolerated. 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. -

Hypertrophic cardiomyopathy 4

Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Illumina Laboratory Services, Illumina

Jan 12, 2018

This variant was observed in the ICSL laboratory as part of a predisposition screen in an ostensibly healthy population. It had not been previously curated by ICSL or reported in the Human Gene Mutation Database (HGMD: prior to June 1st, 2018), and was therefore a candidate for classification through an automated scoring system. Utilizing variant allele frequency, disease prevalence and penetrance estimates, and inheritance mode, an automated score was calculated to assess if this variant is too frequent to cause the disease. Based on the score, this variant could not be ruled out of causing disease and therefore its association with disease required further investigation. A literature search was performed for the gene, cDNA change, and amino acid change (if applicable). No publications were found based on this search. This variant was therefore classified as a variant of unknown significance for this disease. -

Cardiovascular phenotype

Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Ambry Genetics

Nov 27, 2021

The c.2210C>T (p.T737M) alteration is located in exon 23 (coding exon 23) of the MYBPC3 gene. This alteration results from a C to T substitution at nucleotide position 2210, causing the threonine (T) at amino acid position 737 to be replaced by a methionine (M). Based on insufficient or conflicting evidence, the clinical significance of this alteration remains unclear. -

Left ventricular noncompaction 10

Benign:1

Likely benign, criteria provided, single submitter

clinical testing

Illumina Laboratory Services, Illumina

Jan 12, 2018

This variant was observed in the ICSL laboratory as part of a predisposition screen in an ostensibly healthy population. It had not been previously curated by ICSL or reported in the Human Gene Mutation Database (HGMD: prior to June 1st, 2018), and was therefore a candidate for classification through an automated scoring system. Utilizing variant allele frequency, disease prevalence and penetrance estimates, and inheritance mode, an automated score was calculated to assess if this variant is too frequent to cause the disease. Based on the score and internal cut-off values, a variant classified as likely benign is not then subjected to further curation. The score for this variant resulted in a classification of likely benign for this disease. -

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

AlphaMissense

Benign

0.15

CardioboostCm

Benign

0.0030

BayesDel_addAF

Benign

-0.15

BayesDel_noAF

Benign

-0.23

CADD

Benign

DANN

Uncertain

1.0

DEOGEN2

Benign

0.30

T;T;T

Eigen

Uncertain

0.41

Eigen_PC

Uncertain

0.39

FATHMM_MKL

Uncertain

0.86

LIST_S2

Benign

0.86

D;D;D

M_CAP

Uncertain

0.089

MetaRNN

Benign

0.38

T;T;T

MetaSVM

Benign

-0.40

MutationAssessor

Uncertain

2.1

M;.;.

PrimateAI

Benign

0.47

PROVEAN

Benign

-1.4

N;.;N

REVEL

Uncertain

0.30

Sift

Uncertain

0.017

D;.;D

Sift4G

Uncertain

0.025

D;D;D

Vest4

0.35

MVP

0.94

MPC

0.36

ClinPred

0.15

GERP RS

4.4

Varity_R

0.035

gMVP

0.55

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