11-47343126-C-T

Variant names:

• chr11-47343126-C-T
• rs371513491
• NM_000256.3:c.1246G>A

Variant summary

Our verdict is Likely benign. The variant received -1 ACMG points: 0P and 1B. BP6

The NM_000256.3(MYBPC3):​c.1246G>A​(p.Gly416Ser) variant causes a missense change involving the alteration of a conserved nucleotide. The variant allele was found at a frequency of 0.0000645 in 1,611,444 control chromosomes in the GnomAD database, with no homozygous occurrence. 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. G416C) has been classified as Uncertain significance.

• Frequency:
  • Genomes: 𝑓 0.00039 (0 hom., cov: 33)
  • Exomes 𝑓: 0.000030 (0 hom.)
• Consequence: MYBPC3 NM_000256.3 missense
• Clinical Significance: Conflicting classifications of pathogenicity criteria provided, conflicting classifications U:8 B:4
• Conservation: PhyloP100: 7.47
• Publications: 12 publications found

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 Gene-Disease associations (from GenCC):

• hypertrophic cardiomyopathy

  Inheritance: AD Classification: DEFINITIVE Submitted by: ClinGen
• hypertrophic cardiomyopathy 4

  Inheritance: AD, AR Classification: DEFINITIVE, STRONG Submitted by: Ambry Genetics, G2P, Labcorp Genetics (formerly Invitae)
• left ventricular noncompaction 10

  Inheritance: AR, AD Classification: DEFINITIVE, MODERATE, LIMITED Submitted by: Ambry Genetics
• familial isolated dilated cardiomyopathy

  Inheritance: AD Classification: SUPPORTIVE Submitted by: Orphanet
• arrhythmogenic right ventricular cardiomyopathy

  Inheritance: AD Classification: LIMITED Submitted by: ClinGen
• atrial fibrillation

  Inheritance: AD Classification: LIMITED Submitted by: Ambry Genetics
• dilated cardiomyopathy

  Inheritance: AD Classification: LIMITED Submitted by: ClinGen

ACMG classification

Our verdict: Likely_benign. The variant received -1 ACMG points.

• BP6: Variant 11-47343126-C-T is Benign according to our data. Variant chr11-47343126-C-T is described in ClinVar as Conflicting_classifications_of_pathogenicity. ClinVar VariationId is 42515.

Variant Effect in Transcripts

ACMG analysis was done for transcript: NM_000256.3. You can select a different transcript below to see updated ACMG assignments.

RefSeq Transcripts

Selected	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	MYBPC3	NM_000256.3	MANE Select	c.1246G>A	p.Gly416Ser	missense	Exon 15 of 35	NP_000247.2

Ensembl Transcripts

Selected	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	MYBPC3	ENST00000545968.6	TSL:5 MANE Select	c.1246G>A	p.Gly416Ser	missense	Exon 15 of 35	ENSP00000442795.1
	MYBPC3	ENST00000399249.6	TSL:5	c.1246G>A	p.Gly416Ser	missense	Exon 14 of 34	ENSP00000382193.2
	MYBPC3	ENST00000544791.1	TSL:5	n.1246G>A		non_coding_transcript_exon	Exon 15 of 27	ENSP00000444259.1

Frequencies

GnomAD3 genomes AF: 0.000394 AC: 60 AN: 152206 Hom.: 0 Cov.: 33

Gnomad AFR AF: 0.00116

Gnomad AMI AF: 0.00

Gnomad AMR AF: 0.000720

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: 0.00

Gnomad OTH AF: 0.000478

GnomAD2 exomes AF: 0.0000616 AC: 15 AN: 243452 AF XY: 0.0000302

Gnomad AFR exome AF: 0.000745

Gnomad AMR exome AF: 0.0000589

Gnomad ASJ exome AF: 0.00

Gnomad EAS exome AF: 0.0000566

Gnomad FIN exome AF: 0.00

Gnomad NFE exome AF: 0.00000907

Gnomad OTH exome AF: 0.00

GnomAD4 exome AF: 0.0000302 AC: 44 AN: 1459238 Hom.: 0 Cov.: 31 AF XY: 0.0000303 AC XY: 22 AN XY: 725698

African (AFR) AF: 0.000778 AC: 26 AN: 33408

American (AMR) AF: 0.000113 AC: 5 AN: 44356

Ashkenazi Jewish (ASJ) AF: 0.00 AC: 0 AN: 26070

East Asian (EAS) AF: 0.0000505 AC: 2 AN: 39582

South Asian (SAS) AF: 0.00 AC: 0 AN: 85746

European-Finnish (FIN) AF: 0.00 AC: 0 AN: 53078

Middle Eastern (MID) AF: 0.00 AC: 0 AN: 5768

European-Non Finnish (NFE) AF: 0.00000270 AC: 3 AN: 1110946

Other (OTH) AF: 0.000133 AC: 8 AN: 60284

GnomAD4 genome AF: 0.000394 AC: 60 AN: 152206 Hom.: 0 Cov.: 33 AF XY: 0.000403 AC XY: 30 AN XY: 74356

African (AFR) AF: 0.00116 AC: 48 AN: 41446

American (AMR) AF: 0.000720 AC: 11 AN: 15288

Ashkenazi Jewish (ASJ) AF: 0.00 AC: 0 AN: 3472

East Asian (EAS) AF: 0.00 AC: 0 AN: 5194

South Asian (SAS) AF: 0.00 AC: 0 AN: 4834

European-Finnish (FIN) AF: 0.00 AC: 0 AN: 10618

Middle Eastern (MID) AF: 0.00 AC: 0 AN: 316

European-Non Finnish (NFE) AF: 0.00 AC: 0 AN: 68034

Other (OTH) AF: 0.000478 AC: 1 AN: 2092

Alfa AF: 0.000276 Hom.: 0

Bravo AF: 0.000457

ESP6500AA AF: 0.000710 AC: 3

ESP6500EA AF: 0.00 AC: 0

ExAC AF: 0.0000248 AC: 3

ClinVar

Significance: Conflicting classifications of pathogenicity

Submissions summary: Uncertain:8 Benign:4

Revision: criteria provided, conflicting classifications

Submissions by phenotype

not provided Uncertain:2

Clinical Genetics, Academic Medical Center

Significance: Uncertain significance

Review Status: no assertion criteria provided

Collection Method: clinical testing

Jul 14, 2024

GeneDx

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

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: 21310275, 24503780, 25637381, 21415409, 16858239, 22958901, 25351510, 15519027, 23299917, 28166811, 27532257, 27841901, 30847666, 35130036, 35284542, 32420109, 36166435, 15563892)

not specified Uncertain:1 Benign:1

Apr 14, 2016

Laboratory for Molecular Medicine, Mass General Brigham Personalized Medicine

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

proposed classification - variant undergoing re-assessment, contact laboratory

Mar 24, 2025

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

Significance: Likely benign

Review Status: criteria provided, single submitter

Collection Method: clinical testing

Variant summary: MYBPC3 c.1246G>A (p.Gly416Ser) results in a non-conservative amino acid change in the encoded protein sequence. Three of four in-silico tools predict a damaging effect of the variant on protein function. The variant allele was found at a frequency of 6.5e-05 in 1611444 control chromosomes, predominantly at a frequency of 0.00099 within the African or African-American subpopulation in the gnomAD database. This frequency is essentially equivalent to the maximum estimated frequency for a pathogenic variant in MYBPC3 causing Hypertrophic Cardiomyopathy (6.5e-05 vs 0.001). c.1246G>A has been reported in the presumed heterozygous state in the literature in at least 2 related individuals segregating with hypertrophic cardiomyopathy (example, Shen_2022), however it has also been reported in several isolated individuals with other MYBPC3-related cardiomyopathies without strong evidence for causality (example, Walsh_2017, Tomar_2022, Trachoo_2022, Pugh_2014, vanWaning_2018, vanLint_2019, Ntusi_2016). These data do not allow any conclusion about variant significance. To our knowledge, no experimental evidence demonstrating an impact on protein function has been reported. The following publications have been ascertained in the context of this evaluation (PMID: 15519027, 16858239, 18273486, 27841901, 24503780, 35284542, 15563892, 35130036, 36166435, 27532257, 30847666, 29447731). ClinVar contains an entry for this variant (Variation ID: 42515). Based on the evidence outlined above, the variant was classified as likely benign.

Hypertrophic cardiomyopathy 4 Uncertain:1 Benign:1

May 31, 2017

Clinical Genetics DNA and cytogenetics Diagnostics Lab, Erasmus MC, Erasmus Medical Center

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

May 28, 2019

Mendelics

Significance: Benign

Review Status: criteria provided, single submitter

Collection Method: clinical testing

Hypertrophic cardiomyopathy Uncertain:1 Benign:1

Jul 20, 2024

All of Us Research Program, National Institutes of Health

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

This missense variant replaces glycine with serine at codon 416 of the MYBPC3 protein. Computational prediction tool suggests that this variant may not impact protein structure and function (internally defined REVEL score threshold <=0.5, PMID: 27666373). To our knowledge, functional assays have not been performed for this variant. This variant has been reported in individuals affected with hypertrophic cardiomyopathy (PMID: 15519027, 15563892, 27841901), in individuals affected with dilated cardiomyopathy (PMID: 24503780, 35284542, 36166435), as well as in two unaffected individuals (PMID: 15519027). This variant has also been identified in 29/274848 chromosomes (24/23472 African chromosomes) in the general population by the Genome Aggregation Database (gnomAD). The relatively high frequency of this variant in the general population suggests that this variant is unlikely to be disease-causing. However, additional studies are necessary to determine the role of this variant in disease conclusively. Therefore, this variant is classified as a Variant of Uncertain Significance.

Feb 04, 2025

Labcorp Genetics (formerly Invitae), Labcorp

Significance: Likely benign

Review Status: criteria provided, single submitter

Collection Method: clinical testing

Cardiovascular phenotype Uncertain:1 Benign:1

Mar 17, 2023

Ambry Genetics

Significance: Likely benign

Review Status: criteria provided, single submitter

Collection Method: clinical testing

This alteration is classified as likely benign based on a combination of the following: seen in unaffected individuals, population frequency, intact protein function, lack of segregation with disease, co-occurrence, RNA analysis, in silico models, amino acid conservation, lack of disease association in case-control studies, and/or the mechanism of disease or impacted region is inconsistent with a known cause of pathogenicity.

Apr 09, 2025

Molecular Diagnostic Laboratory for Inherited Cardiovascular Disease, Montreal Heart Institute

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

PP3

Cardiomyopathy Uncertain:1

Mar 05, 2024

Color Diagnostics, LLC DBA Color Health

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

This missense variant replaces glycine with serine at codon 416 of the MYBPC3 protein. Computational prediction tools indicate that this variant's impact on protein structure and function is inconclusive. To our knowledge, functional studies have not been performed for this variant. This variant has been reported in individuals affected with hypertrophic cardiomyopathy (PMID: 15519027, 15563892, 27841901), in individuals affected with dilated cardiomyopathy (PMID: 24503780, 35284542, 36166435), as well as in two unaffected individuals (PMID: 15519027). This variant has also been identified in 29/274848 chromosomes (24/23472 African chromosomes) in the general population by the Genome Aggregation Database (gnomAD). The elevated variant allele frequency in the general population indicates that this variant may not be disease-causing. However, additional studies are necessary to determine the role of this variant in disease conclusively. Therefore, this variant is classified as a Variant of Uncertain Significance.

Primary familial hypertrophic cardiomyopathy Uncertain:1

Jun 01, 2014

CSER _CC_NCGL, University of Washington

Significance: Uncertain significance

Review Status: no assertion criteria provided

Collection Method: research

Computational scores

Source: dbNSFP v4.9

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Benign	0.21
CardioboostCm	Benign	0.069
BayesDel_addAF	Benign	-0.032	T
BayesDel_noAF	Pathogenic	0.16
CADD	Pathogenic	26
DANN	Uncertain	1.0
DEOGEN2	Uncertain	0.75	D
Eigen	Uncertain	0.63
Eigen_PC	Uncertain	0.49
FATHMM_MKL	Pathogenic	0.98	D
LIST_S2	Uncertain	0.97	D
M_CAP	Uncertain	0.14	D
MetaRNN	Uncertain	0.74	D
MetaSVM	Uncertain	-0.16	T
MutationAssessor	Uncertain	2.6	M
PhyloP100		7.5
PrimateAI	Uncertain	0.59	T
PROVEAN	Pathogenic	-5.6	D
REVEL	Uncertain	0.48
Sift	Uncertain	0.0030	D
Sift4G	Pathogenic	0.0	D
Vest4		0.85
MVP		0.83
MPC		0.76
ClinPred		0.83	D
GERP RS		4.7
Varity_R		0.66
gMVP		0.71
Mutation Taster		=10/90	disease causing

Splicing

Name	Calibrated prediction	Score	Prediction
SpliceAI score (max)		0.14		Details are displayed if max score is > 0.2

Find out detailed SpliceAI scores and Pangolin per-transcript scores at spliceailookup.broadinstitute.org

Other links and lift over

dbSNP: rs371513491; hg19: chr11-47364677;