rs376041792

chr11-47342636-C-T

Variant summary

Our verdict is Likely benign. Variant got -6 ACMG points: 0P and 6B. BP4_Strong BP6 BP7

The NM_000256.3(MYBPC3):c.1566G>A(p.Ala522=) variant causes a synonymous change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.000182 in 1,613,956 control chromosomes in the GnomAD database, including 1 homozygotes. In-silico tool predicts a benign outcome for this variant. Variant has been reported in ClinVar as Conflicting classifications of pathogenicity (no stars). Synonymous variant affecting the same amino acid position (i.e. A522A) has been classified as Likely benign.

• Frequency:
  • Genomes: 𝑓 0.00016 (0 hom., cov: 33)
  • Exomes 𝑓: 0.00018 (1 hom.)
• Consequence: MYBPC3 NM_000256.3 synonymous
• Clinical Significance: Conflicting classifications of pathogenicity criteria provided, conflicting classifications U:1 B:13
• Conservation: PhyloP100: -5.18

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 Likely_benign. Variant got -6 ACMG points.

• BP4: Computational evidence support a benign effect (BayesDel_noAF=-0.69).
• BP6: Variant 11-47342636-C-T is Benign according to our data. Variant chr11-47342636-C-T is described in ClinVar as [Conflicting_classifications_of_pathogenicity]. Clinvar id is 42546.We mark this variant Likely_benign, oryginal submissions are: {Benign=2, Likely_benign=9, Uncertain_significance=1}. Variant chr11-47342636-C-T is described in Lovd as [Benign]. Variant chr11-47342636-C-T is described in Lovd as [Likely_benign].
• BP7: Synonymous conserved (PhyloP=-5.18 with no splicing effect.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
MYBPC3	NM_000256.3	c.1566G>A	p.Ala522=	synonymous_variant	17/35	ENST00000545968.6

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
MYBPC3	ENST00000545968.6	c.1566G>A	p.Ala522=	synonymous_variant	17/35	5	NM_000256.3	P4
MYBPC3	ENST00000399249.6	c.1566G>A	p.Ala522=	synonymous_variant	16/34	5		A2
MYBPC3	ENST00000544791.1	c.1566G>A	p.Ala522=	synonymous_variant, NMD_transcript_variant	17/27	5

Frequencies

GnomAD3 genomes AF: 0.000164 AC: 25 AN: 152204 Hom.: 0 Cov.: 33

Gnomad AFR AF: 0.000169

Gnomad AMI AF: 0.00

Gnomad AMR AF: 0.00

Gnomad ASJ AF: 0.000288

Gnomad EAS AF: 0.00

Gnomad SAS AF: 0.000415

Gnomad FIN AF: 0.0000942

Gnomad MID AF: 0.00

Gnomad NFE AF: 0.000206

Gnomad OTH AF: 0.00

GnomAD3 exomes AF: 0.000221 AC: 55 AN: 249084 Hom.: 0 AF XY: 0.000222 AC XY: 30 AN XY: 135152

Gnomad AFR exome AF: 0.000194

Gnomad AMR exome AF: 0.000174

Gnomad ASJ exome AF: 0.000299

Gnomad EAS exome AF: 0.00

Gnomad SAS exome AF: 0.0000980

Gnomad FIN exome AF: 0.0000465

Gnomad NFE exome AF: 0.000345

Gnomad OTH exome AF: 0.00

GnomAD4 exome AF: 0.000183 AC: 268 AN: 1461634 Hom.: 1 Cov.: 31 AF XY: 0.000186 AC XY: 135 AN XY: 727098

Gnomad4 AFR exome AF: 0.0000896

Gnomad4 AMR exome AF: 0.000134

Gnomad4 ASJ exome AF: 0.000115

Gnomad4 EAS exome AF: 0.0000252

Gnomad4 SAS exome AF: 0.000128

Gnomad4 FIN exome AF: 0.0000937

Gnomad4 NFE exome AF: 0.000190

Gnomad4 OTH exome AF: 0.000199

GnomAD4 genome AF: 0.000164 AC: 25 AN: 152322 Hom.: 0 Cov.: 33 AF XY: 0.000148 AC XY: 11 AN XY: 74492

Gnomad4 AFR AF: 0.000168

Gnomad4 AMR AF: 0.00

Gnomad4 ASJ AF: 0.000288

Gnomad4 EAS AF: 0.00

Gnomad4 SAS AF: 0.000415

Gnomad4 FIN AF: 0.0000942

Gnomad4 NFE AF: 0.000206

Gnomad4 OTH AF: 0.00

Alfa AF: 0.000244 Hom.: 0

Bravo AF: 0.000144

EpiCase AF: 0.000491

EpiControl AF: 0.000533

ClinVar

Significance: Conflicting classifications of pathogenicity

Submissions summary: Uncertain:1 Benign:13

Revision: criteria provided, conflicting classifications

Submissions by phenotype

not specified Benign:3

Likely benign, criteria provided, single submitter	clinical testing	Women's Health and Genetics/Laboratory Corporation of America, LabCorp	Aug 19, 2023	- -
Benign, no assertion criteria provided	clinical testing	Clinical Genetics, Academic Medical Center	-	- -
Likely benign, criteria provided, single submitter	clinical testing	Laboratory for Molecular Medicine, Mass General Brigham Personalized Medicine	Dec 04, 2015	p.Ala522Ala in exon 17 of MYBPC3: This variant is not expected to have clinical significance because it does not alter an amino acid residue and is not located within the splice consensus sequence. It has been identified in 23/66374 Europea n chromosomes by the Exome Aggregation Consortium (ExAC, http://exac.broadinstit ute.org; dbSNP rs376041792). -

not provided Benign:3

Likely benign, no assertion criteria provided	clinical testing	Joint Genome Diagnostic Labs from Nijmegen and Maastricht, Radboudumc and MUMC+	-	- -
Benign, criteria provided, single submitter	clinical testing	GeneDx	Mar 03, 2015	- -
Likely benign, criteria provided, single submitter	clinical testing	CeGaT Center for Human Genetics Tuebingen	Sep 01, 2023	MYBPC3: BP4, BP7 -

Hypertrophic cardiomyopathy 4 Uncertain:1 Benign:1

Likely benign, criteria provided, single submitter	clinical testing	Clinical Genetics DNA and cytogenetics Diagnostics Lab, Erasmus MC, Erasmus Medical Center	Jun 28, 2017	- -
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. -

Cardiomyopathy Benign:2

Likely benign, criteria provided, single submitter	clinical testing	CHEO Genetics Diagnostic Laboratory, Children's Hospital of Eastern Ontario	Feb 12, 2019	- -
Likely benign, criteria provided, single submitter	clinical testing	Color Diagnostics, LLC DBA Color Health	Oct 16, 2018	- -

Hypertrophic cardiomyopathy Benign:2

Likely benign, criteria provided, single submitter	clinical testing	Invitae	Jan 24, 2024	- -
Likely benign, criteria provided, single submitter	clinical testing	All of Us Research Program, National Institutes of Health	Dec 14, 2023	- -

Left ventricular noncompaction 10 Benign:1

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 benign is not then subjected to further curation. The score for this variant resulted in a classification of benign for this disease. -

Cardiovascular phenotype Benign:1

Likely benign, criteria provided, single submitter

clinical testing

Ambry Genetics

Mar 07, 2018

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. -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
BayesDel_noAF	Benign	-0.69
Cadd	Benign	0.0050
Dann	Benign	0.39

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

Other links and lift over

dbSNP: rs376041792; hg19: chr11-47364187;