NM_000257.4:c.5342G>A

Variant names:

Variant summary

Our verdict is Uncertain significance. Variant got 5 ACMG points: 5P and 0B. PS4_ModeratePM2PP3

This summary comes from the ClinGen Evidence Repository: The c.5342G>A (p.Arg1781His) variant in MYH7 has been identified in at least 12 individuals with HCM (PS4_Moderate; Lopes 2015 PMID:25351510; Walsh 2017 PMID:27532257; GeneDx pers comm; Invitae pers comm; LMM pers comm; OMGL pers comm). This variant was identified in 0.00116% (FAF 95% CI; 2/30616) of South Asian chromosomes by gnomAD v2.1.1 (PM2; https://gnomad.broadinstitute.org). Computational prediction tools and conservation analysis suggest that this variant may impact the protein (PP3). In summary, due to a lack of evidence, this variant is classified as uncertain significance for hypertrophic cardiomyopathy in an autosomal dominant manner. MYH7-specific ACMG/AMP criteria applied (Kelly 2018 PMID:29300372): PS4_Moderate, PM2, PP3. LINK:https://erepo.genome.network/evrepo/ui/classification/CA015985/MONDO:0005045/002

Frequency

Genomes: 𝑓 0.000026 ( 0 hom., cov: 32)

Exomes 𝑓: 0.000016 ( 0 hom. )

Consequence

MYH7
NM_000257.4 missense

Scores

Clinical Significance

Uncertain significance reviewed by expert panel P:1U:6

Conservation

PhyloP100: 5.90

Variant links:

Genes affected

MYH7 (HGNC:7577): (myosin heavy chain 7) Muscle myosin is a hexameric protein containing 2 heavy chain subunits, 2 alkali light chain subunits, and 2 regulatory light chain subunits. This gene encodes the beta (or slow) heavy chain subunit of cardiac myosin. It is expressed predominantly in normal human ventricle. It is also expressed in skeletal muscle tissues rich in slow-twitch type I muscle fibers. Changes in the relative abundance of this protein and the alpha (or fast) heavy subunit of cardiac myosin correlate with the contractile velocity of cardiac muscle. Its expression is also altered during thyroid hormone depletion and hemodynamic overloading. Mutations in this gene are associated with familial hypertrophic cardiomyopathy, myosin storage myopathy, dilated cardiomyopathy, and Laing distal myopathy. [provided by RefSeq, May 2022]

MYH7 links:

ENSG00000258444 (HGNC:):

ENSG00000258444 links:

MHRT (HGNC:51291): (myosin heavy chain associated RNA transcript) This gene encodes a spliced long non-coding RNA that may act as a cardioprotective agent in the heart. Based on a study of a similar gene in mouse, the encoded transcript may regulate chromatin remodeling by acting as a decoy to the BRG1 chromatin repressor complex thus preventing it from binding to its genomic targets. Blocking the actions of BRG1 could be crucial in protecting the heart from pathological hypertrophy. [provided by RefSeq, Dec 2014]

MHRT links:

Genome browser will be placed here

ACMG classification

Classification made for transcript

Verdict is Uncertain_significance. Variant got 5 ACMG points.

PS4

For more information check the summary or visit ClinGen Evidence Repository.

PM2

For more information check the summary or visit ClinGen Evidence Repository.

PP3

For more information check the summary or visit ClinGen Evidence Repository.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
MYH7	NM_000257.4 link	c.5342G>A	p.Arg1781His	missense_variant	Exon 37 of 40	ENST00000355349.4	NP_000248.2	P12883
MYH7	NM_001407004.1 link	c.5342G>A	p.Arg1781His	missense_variant	Exon 36 of 39		NP_001393933.1
MHRT	NR_126491.1 link	n.-238C>T		upstream_gene_variant

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
MYH7	ENST00000355349.4 link	c.5342G>A	p.Arg1781His	missense_variant	Exon 37 of 40	1	NM_000257.4	ENSP00000347507.3		P12883
ENSG00000258444	ENST00000557368.1 link	n.-127C>T		upstream_gene_variant		3

Frequencies

GnomAD3 genomes

AF:

0.0000263

AC:

AN:

152232

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.0000241

Gnomad AMI

AF:

0.00

Gnomad AMR

AF:

0.0000654

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:

0.0000294

Gnomad OTH

AF:

0.00

GnomAD3 exomes

AF:

0.0000119

AC:

AN:

251492

Hom.:

AF XY:

0.00000736

AC XY:

AN XY:

135922

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:

0.0000653

Gnomad FIN exome

AF:

0.00

Gnomad NFE exome

AF:

0.00000879

Gnomad OTH exome

AF:

0.00

GnomAD4 exome

AF:

0.0000157

AC:

AN:

1461890

Hom.:

Cov.:

AF XY:

0.0000110

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:

0.0000348

Gnomad4 FIN exome

AF:

0.00

Gnomad4 NFE exome

AF:

0.0000171

Gnomad4 OTH exome

AF:

0.0000166

GnomAD4 genome

AF:

0.0000263

AC:

AN:

152350

Hom.:

Cov.:

AF XY:

0.0000268

AC XY:

AN XY:

74500

show subpopulations

Gnomad4 AFR

AF:

0.0000241

Gnomad4 AMR

AF:

0.0000653

Gnomad4 ASJ

AF:

0.00

Gnomad4 EAS

AF:

0.00

Gnomad4 SAS

AF:

0.00

Gnomad4 FIN

AF:

0.00

Gnomad4 NFE

AF:

0.0000294

Gnomad4 OTH

AF:

0.00

Alfa

AF:

0.0000868

Hom.:

Bravo

AF:

0.0000227

ExAC

AF:

0.00000824

AC:

ClinVar

Significance: Uncertain significance

Submissions summary: Pathogenic:1Uncertain:6

Revision: reviewed by expert panel

LINK: link

Submissions by phenotype

Hypertrophic cardiomyopathy

Pathogenic:1Uncertain:2

Aug 25, 2021

ClinGen Cardiomyopathy Variant Curation Expert Panel

Significance: Uncertain significance

Review Status: reviewed by expert panel

Collection Method: curation

The c.5342G>A (p.Arg1781His) variant in MYH7 has been identified in at least 12 individuals with HCM (PS4_Moderate; Lopes 2015 PMID: 25351510; Walsh 2017 PMID: 27532257; GeneDx pers comm; Invitae pers comm; LMM pers comm; OMGL pers comm). This variant was identified in 0.00116% (FAF 95% CI; 2/30616) of South Asian chromosomes by gnomAD v2.1.1 (PM2; https://gnomad.broadinstitute.org). Computational prediction tools and conservation analysis suggest that this variant may impact the protein (PP3). In summary, due to a lack of evidence, this variant is classified as uncertain significance for hypertrophic cardiomyopathy in an autosomal dominant manner. MYH7-specific ACMG/AMP criteria applied (Kelly 2018 PMID:29300372): PS4_Moderate, PM2, PP3. -

Jan 21, 2014

Centre for Mendelian Genomics, University Medical Centre Ljubljana

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

- -

Dec 04, 2024

Labcorp Genetics (formerly Invitae), Labcorp

Significance: Pathogenic

Review Status: criteria provided, single submitter

Collection Method: clinical testing

This sequence change replaces arginine, which is basic and polar, with histidine, which is basic and polar, at codon 1781 of the MYH7 protein (p.Arg1781His). This variant is present in population databases (rs397516246, gnomAD 0.003%). This missense change has been observed in individuals with hypertrophic cardiomyopathy (PMID: 17125710, 27532257; internal data). ClinVar contains an entry for this variant (Variation ID: 43064). 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 expected to disrupt MYH7 protein function with a positive predictive value of 95%. For these reasons, this variant has been classified as Pathogenic. -

not provided

Uncertain:2

Aug 07, 2023

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 -

Jan 19, 2022

GeneDx

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

Variant reported in multiple unrelated individuals with HCM in the published literature or referred for genetic testing at GeneDx; however, few clinical details were provided and some individuals harbor additional cardiogenetic variants (Laredo et al., 2006; Kaski et al., 2009; Lopes et al., 2015; Homburger et al., 2016; Alamo et al., 2017; Mademont-Soler et al., 2017; Walsh et al., 2017); Not observed at a significant frequency in large population cohorts (gnomAD); In silico analysis, which includes protein predictors and evolutionary conservation, supports a deleterious effect; Reported in ClinVar (ClinVar Variant ID# 43064; ClinVar); This variant is associated with the following publications: (PMID: 27532257, 17125710, 20031618, 25351510, 28606303, 28771489, 27247418, 29687901, 24111713, 32531501) -

Congenital myopathy with fiber type disproportion;C1834481:Dilated cardiomyopathy 1S;C1842160:Myosin storage myopathy;C1850709:Myopathy, myosin storage, autosomal recessive;C3495498:Hypertrophic cardiomyopathy 1;C4552004:MYH7-related skeletal myopathy

Uncertain:1

Sep 04, 2021

Fulgent Genetics, Fulgent Genetics

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

- -

Cardiovascular phenotype

Uncertain:1

Apr 09, 2024

Ambry Genetics

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

The p.R1781H variant (also known as c.5342G>A), located in coding exon 35 of the MYH7 gene, results from a G to A substitution at nucleotide position 5342. The arginine at codon 1781 is replaced by histidine, an amino acid with highly similar properties. This variant has been detected in individuals from hypertrophic cardiomyopathy (HCM) cohorts; however, in some instances clinical detail was limited and co-occurring variants were present, and some reports may overlap (Laredo R et al. Rev Esp Cardiol, 2006 Oct;59:1008-18; Lopes LR et al. J. Med. Genet., 2013 Apr;50:228-39; Walsh R et al. Genet. Med., 2017 02;19:192-203; Mademont-Soler I et al. PLoS ONE, 2017 Aug;12:e0181465; Mazzarotto F et al. Genet. Med., 2019 02;21:284-292; Azevedo O et al. Am. Heart J., 2020 Apr;226:114-126). 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

Pathogenic

0.88

CardioboostCm

Pathogenic

0.95

BayesDel_addAF

Pathogenic

0.21

BayesDel_noAF

Pathogenic

0.15

CADD

Pathogenic

DANN

Pathogenic

1.0

DEOGEN2

Pathogenic

0.85

Eigen

Pathogenic

0.91

Eigen_PC

Pathogenic

0.83

FATHMM_MKL

Pathogenic

0.99

LIST_S2

Pathogenic

0.98

M_CAP

Pathogenic

0.96

MetaRNN

Pathogenic

0.92

MetaSVM

Uncertain

0.67

MutationAssessor

Pathogenic

4.1

PrimateAI

Pathogenic

0.86

PROVEAN

Uncertain

-3.4

REVEL

Pathogenic

0.75

Sift

Pathogenic

0.0

Sift4G

Uncertain

0.0050

Polyphen

1.0

Vest4

0.77

MutPred

0.49

Loss of MoRF binding (P = 0.0071);

MVP

0.98

MPC

1.7

ClinPred

1.0

GERP RS

5.1

Varity_R

0.72

gMVP

0.84

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