rs368035400

Positions:

• chr11-47349897-G-A
• chr11-47349897-G-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.531C>T​(p.Arg177=) variant causes a synonymous change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.000135 in 1,608,634 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. R177R) has been classified as Likely benign.

• Frequency:
  • Genomes: 𝑓 0.00011 (0 hom., cov: 32)
  • Exomes 𝑓: 0.00014 (1 hom.)
• Consequence: MYBPC3 NM_000256.3 synonymous
• Clinical Significance: Conflicting classifications of pathogenicity criteria provided, conflicting classifications U:1 B:10
• Conservation: PhyloP100: -3.08

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=-0.83).
• BP6: Variant 11-47349897-G-A is Benign according to our data. Variant chr11-47349897-G-A is described in ClinVar as [Conflicting_classifications_of_pathogenicity]. Clinvar id is 180923.We mark this variant Likely_benign, oryginal submissions are: {Likely_benign=7, Benign=1, Uncertain_significance=1}. Variant chr11-47349897-G-A is described in Lovd as [Likely_benign]. Variant chr11-47349897-G-A is described in Lovd as [Benign].
• BP7: Synonymous conserved (PhyloP=-3.08 with no splicing effect.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
MYBPC3	NM_000256.3	c.531C>T	p.Arg177=	synonymous_variant	5/35	ENST00000545968.6

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
MYBPC3	ENST00000545968.6	c.531C>T	p.Arg177=	synonymous_variant	5/35	5	NM_000256.3	P4
MYBPC3	ENST00000399249.6	c.531C>T	p.Arg177=	synonymous_variant	5/34	5		A2
MYBPC3	ENST00000544791.1	c.531C>T	p.Arg177=	synonymous_variant, NMD_transcript_variant	5/27	5

Frequencies

GnomAD3 genomes AF: 0.000112 AC: 17 AN: 152060 Hom.: 0 Cov.: 32

Gnomad AFR AF: 0.000121

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: 0.000176

Gnomad OTH AF: 0.00

GnomAD3 exomes AF: 0.000140 AC: 33 AN: 236538 Hom.: 0 AF XY: 0.000124 AC XY: 16 AN XY: 129042

Gnomad AFR exome AF: 0.000218

Gnomad AMR exome AF: 0.000270

Gnomad ASJ exome AF: 0.00

Gnomad EAS exome AF: 0.00

Gnomad SAS exome AF: 0.0000342

Gnomad FIN exome AF: 0.00

Gnomad NFE exome AF: 0.000178

Gnomad OTH exome AF: 0.000172

GnomAD4 exome AF: 0.000137 AC: 200 AN: 1456574 Hom.: 1 Cov.: 31 AF XY: 0.000127 AC XY: 92 AN XY: 724146

Gnomad4 AFR exome AF: 0.0000898

Gnomad4 AMR exome AF: 0.000204

Gnomad4 ASJ exome AF: 0.00

Gnomad4 EAS exome AF: 0.00

Gnomad4 SAS exome AF: 0.0000586

Gnomad4 FIN exome AF: 0.00

Gnomad4 NFE exome AF: 0.000162

Gnomad4 OTH exome AF: 0.0000499

GnomAD4 genome AF: 0.000112 AC: 17 AN: 152060 Hom.: 0 Cov.: 32 AF XY: 0.0000673 AC XY: 5 AN XY: 74282

Gnomad4 AFR AF: 0.000121

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: 0.000176

Gnomad4 OTH AF: 0.00

Alfa AF: 0.0000783 Hom.: 0

Bravo AF: 0.000147

ClinVar

Significance: Conflicting classifications of pathogenicity

Submissions summary: Uncertain:1 Benign:10

Revision: criteria provided, conflicting classifications

Submissions by phenotype

Hypertrophic cardiomyopathy 4 Uncertain:1 Benign:2

Likely benign, no assertion criteria provided	clinical testing	Diagnostic Laboratory, Department of Genetics, University Medical Center Groningen	-	- -
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	Apr 27, 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. -

not specified Benign:2

Benign, no assertion criteria provided	clinical testing	Clinical Genetics, Academic Medical Center	-	- -
Benign, criteria provided, single submitter	clinical testing	GeneDx	Apr 14, 2014	This variant is considered likely benign or benign based on one or more of the following criteria: it is a conservative change, it occurs at a poorly conserved position in the protein, it is predicted to be benign by multiple in silico algorithms, and/or has population frequency not consistent with disease. -

Cardiomyopathy Benign:2

Likely benign, criteria provided, single submitter	clinical testing	CHEO Genetics Diagnostic Laboratory, Children's Hospital of Eastern Ontario	Jul 04, 2022	- -
Likely benign, criteria provided, single submitter	clinical testing	Color Diagnostics, LLC DBA Color Health	Nov 03, 2018	- -

Hypertrophic cardiomyopathy Benign:2

Likely benign, criteria provided, single submitter	clinical testing	Invitae	Jan 15, 2024	- -
Likely benign, criteria provided, single submitter	clinical testing	All of Us Research Program, National Institutes of Health	Dec 01, 2023	- -

Left ventricular noncompaction 10 Benign:1

Likely benign, criteria provided, single submitter

clinical testing

Illumina Laboratory Services, Illumina

Apr 27, 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 allowed determination this variant is unlikely to cause disease. Therefore, this variant is classified as likely benign. -

Cardiovascular phenotype Benign:1

Likely benign, criteria provided, single submitter

clinical testing

Ambry Genetics

Aug 31, 2017

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	-0.83
CADD	Benign	0.065
DANN	Benign	0.88

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: rs368035400; hg19: chr11-47371448;