chr14-23398991-T-C

Variant names:

Variant summary

Our verdict is Likely benign. Variant got -3 ACMG points: 1P and 4B. PP3BS2

The NM_002471.4(MYH6):c.1628A>G(p.Lys543Arg) variant causes a missense change involving the alteration of a conserved nucleotide. The variant allele was found at a frequency of 0.0000471 in 1,613,992 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 (★★).

Frequency

Genomes: 𝑓 0.000059 ( 0 hom., cov: 31)

Exomes 𝑓: 0.000046 ( 0 hom. )

Consequence

MYH6
NM_002471.4 missense

Scores

Clinical Significance

Uncertain significance criteria provided, multiple submitters, no conflicts U:7

Conservation

PhyloP100: 7.79

Variant links:

Genes affected

MYH6 (HGNC:7576): (myosin heavy chain 6) Cardiac muscle myosin is a hexamer consisting of two heavy chain subunits, two light chain subunits, and two regulatory subunits. This gene encodes the alpha heavy chain subunit of cardiac myosin. The gene is located approximately 4kb downstream of the gene encoding the beta heavy chain subunit of cardiac myosin. Mutations in this gene cause familial hypertrophic cardiomyopathy and atrial septal defect 3. [provided by RefSeq, Feb 2017]

MYH6 links:

Genome browser will be placed here

ACMG classification

Classification made for transcript

Verdict is Likely_benign. Variant got -3 ACMG points.

PP3

MetaRNN computational evidence supports a deleterious effect, 0.801

BS2

High AC in GnomAd4 at 9 AD gene.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
MYH6	NM_002471.4 link	c.1628A>G	p.Lys543Arg	missense_variant	Exon 15 of 39	ENST00000405093.9	NP_002462.2

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
MYH6	ENST00000405093.9 link	c.1628A>G	p.Lys543Arg	missense_variant	Exon 15 of 39	5	NM_002471.4	ENSP00000386041.3		P13533

Frequencies

GnomAD3 genomes

AF:

0.0000592

AC:

AN:

152100

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.00

Gnomad AMI

AF:

0.00

Gnomad AMR

AF:

0.0000655

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:

0.000118

Gnomad OTH

AF:

0.00

GnomAD3 exomes

AF:

0.0000398

AC:

AN:

251030

Hom.:

AF XY:

0.0000368

AC XY:

AN XY:

135718

show subpopulations

Gnomad AFR exome

AF:

0.00

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:

0.0000882

Gnomad OTH exome

AF:

0.00

GnomAD4 exome

AF:

0.0000458

AC:

AN:

1461892

Hom.:

Cov.:

AF XY:

0.0000481

AC XY:

AN XY:

727248

show subpopulations

Gnomad4 AFR exome

AF:

0.00

Gnomad4 AMR exome

AF:

0.00

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:

0.0000603

Gnomad4 OTH exome

AF:

0.00

GnomAD4 genome

AF:

0.0000592

AC:

AN:

152100

Hom.:

Cov.:

AF XY:

0.0000673

AC XY:

AN XY:

74318

show subpopulations

Gnomad4 AFR

AF:

0.00

Gnomad4 AMR

AF:

0.0000655

Gnomad4 ASJ

AF:

0.00

Gnomad4 EAS

AF:

0.00

Gnomad4 SAS

AF:

0.00

Gnomad4 FIN

AF:

0.00

Gnomad4 NFE

AF:

0.000118

Gnomad4 OTH

AF:

0.00

Alfa

AF:

0.000102

Hom.:

Bravo

AF:

0.0000453

ESP6500AA

AF:

0.00

AC:

ESP6500EA

AF:

0.000116

AC:

ExAC

AF:

0.0000494

AC:

EpiCase

AF:

0.000109

EpiControl

AF:

0.00

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:7

Revision: criteria provided, multiple submitters, no conflicts

LINK: link

Submissions by phenotype

not provided

Uncertain:2

Aug 01, 2023

CeGaT Center for Human Genetics Tuebingen

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

- -

Oct 06, 2020

GeneDx

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

Reported previously in a family with atrial septal defects (Posch et al., 2011); Identified in a cohort of DCM patients (Dal Ferro et al., 2017) and was identified in a patient with LVNC who also harbored other cardiogenetic variants (Miszalski et al., 2017); Reported in ClinVar as a variant of uncertain significance (ClinVar Variant ID# 228888; Landrum et al., 2016); 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: 30847666, 28798025, 28416588, 26014430, 22194935) -

not specified

Uncertain:1

Apr 03, 2015

Laboratory for Molecular Medicine, Mass General Brigham Personalized Medicine

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

The p.Lys543Arg variant in MYH6 has been reported in one individual with atriove ntricular septal defect (AVSD) and segregated with disease in one affected relat ive. Two additional relatives also carried this variant; however these individua ls were unavailable for clinical evaluation (Posch 2011). In addition, this vari ant has been identified in 6/66734 European chromosomes by the Exome Aggregation Consortium (ExAC, http://exac.broadinstitute.org; dbSNP rs367663906). Computati onal prediction tools and conservation analysis do not provide strong support fo r or against an impact to the protein. In summary, the clinical significance of the p.Lys543Arg variant is uncertain. -

Hypertrophic cardiomyopathy 14

Uncertain:1

Dec 16, 2024

Labcorp Genetics (formerly Invitae), Labcorp

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

This sequence change replaces lysine, which is basic and polar, with arginine, which is basic and polar, at codon 543 of the MYH6 protein (p.Lys543Arg). This variant is present in population databases (rs367663906, gnomAD 0.01%). This missense change has been observed in individual(s) with MYH6-related conditions (PMID: 22194935, 28416588, 28798025, 30847666). ClinVar contains an entry for this variant (Variation ID: 228888). Invitae Evidence Modeling of protein sequence and biophysical properties (such as structural, functional, and spatial information, amino acid conservation, physicochemical variation, residue mobility, and thermodynamic stability) indicates that this missense variant is not expected to disrupt MYH6 protein function with a negative predictive value of 80%. 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. -

Dilated cardiomyopathy 1EE;C2750467:Hypertrophic cardiomyopathy 14;C3279790:Atrial septal defect 3;C3279791:Sick sinus syndrome 3, susceptibility to;C3495498:Hypertrophic cardiomyopathy 1

Uncertain:1

Sep 15, 2021

Fulgent Genetics, Fulgent Genetics

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

- -

MYH6-related disorder

Uncertain:1

Jan 12, 2024

PreventionGenetics, part of Exact Sciences

Significance: Uncertain significance

Review Status: no assertion criteria provided

Collection Method: clinical testing

The MYH6 c.1628A>G variant is predicted to result in the amino acid substitution p.Lys543Arg. This variant has been reported in a family with atrial septal defects (Posch et al. 2011. PubMed ID: 22194935) and in patients with dilated cardiomyopathy, hypertrophic cardiomyopathy, or left ventricular noncompaction (Table S1, Dal Ferro et al. 2017. PubMed ID: 28416588; Table S3, Miszalski-Jamka et al. 2017. PubMed ID: 28798025; Table S2, van Lint et al. 2019. PubMed ID: 30847666). This variant is reported in 0.0085% of alleles in individuals of European (Non-Finnish) descent in gnomAD. At this time, the clinical significance of this variant is uncertain due to the absence of conclusive functional and genetic evidence. -

Cardiovascular phenotype

Uncertain:1

May 04, 2021

Ambry Genetics

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

The p.K543R variant (also known as c.1628A>G), located in coding exon 13 of the MYH6 gene, results from an A to G substitution at nucleotide position 1628. The lysine at codon 543 is replaced by arginine, an amino acid with highly similar properties. This alteration has been reported in affected and unaffected family members in a family with atrial septal defect (Posch MG et al. PLoS One, 2011 Dec;6:e28872). This variant was detected in a cardiomyopathy genetic testing cohort and in a subject with left ventricular non-compaction (LVNC); however, clinical details were limited, and additional cardiac variants were detected in some cases (Miszalski-Jamka K et al. Circ Cardiovasc Genet, 2017 Aug;10:; van Lint FHM et al. Neth Heart J, 2019 Jun;27:304-309). This amino acid position is highly conserved in available vertebrate species. In addition, this alteration is predicted to be deleterious by in silico analysis. 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

Benign

0.28

BayesDel_addAF

Pathogenic

0.22

BayesDel_noAF

Pathogenic

0.29

CADD

Pathogenic

DANN

Uncertain

1.0

DEOGEN2

Uncertain

0.74

D;D

Eigen

Uncertain

0.56

Eigen_PC

Uncertain

0.53

FATHMM_MKL

Uncertain

0.97

LIST_S2

Uncertain

0.97

D;.

M_CAP

Uncertain

0.13

MetaRNN

Pathogenic

0.80

D;D

MetaSVM

Uncertain

0.74

MutationAssessor

Uncertain

2.1

M;M

PrimateAI

Uncertain

0.65

PROVEAN

Uncertain

-2.6

D;D

REVEL

Pathogenic

0.87

Sift

Uncertain

0.0090

D;D

Sift4G

Uncertain

0.032

D;D

Polyphen

0.64

P;P

Vest4

0.68

MVP

0.90

MPC

0.70

ClinPred

0.60

GERP RS

4.2

Varity_R

0.58

gMVP

0.63

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