rs201051663

Variant summary

Our verdict is Likely benign. Variant got -2 ACMG points: 2P and 4B. PP2PP3BS2

The NM_002471.4(MYH6):c.3758C>T(p.Thr1253Met) variant causes a missense change. The variant allele was found at a frequency of 0.000026 in 1,614,032 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 (★★). Synonymous variant affecting the same amino acid position (i.e. T1253T) has been classified as Likely benign.

Frequency

Genomes: 𝑓 0.000013 ( 0 hom., cov: 32)

Exomes 𝑓: 0.000027 ( 0 hom. )

Consequence

MYH6
NM_002471.4 missense

Scores

Clinical Significance

Uncertain significance criteria provided, multiple submitters, no conflicts U:5

Conservation

PhyloP100: 4.76

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 -2 ACMG points.

PP2

Missense variant where missense usually causes diseases, MYH6

PP3

MetaRNN computational evidence supports a deleterious effect, 0.795

BS2

High AC in GnomAdExome at 7 AD gene.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
MYH6	NM_002471.4 linkuse as main transcript	c.3758C>T	p.Thr1253Met	missense_variant	27/39	ENST00000405093.9

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
MYH6	ENST00000405093.9 linkuse as main transcript	c.3758C>T	p.Thr1253Met	missense_variant	27/39	5	NM_002471.4	P1

Frequencies

GnomAD3 genomes

AF:

0.0000131

AC:

AN:

152140

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.0000241

Gnomad AMI

AF:

0.00

Gnomad AMR

AF:

0.00

Gnomad ASJ

AF:

0.00

Gnomad EAS

AF:

0.000193

Gnomad SAS

AF:

0.00

Gnomad FIN

AF:

0.00

Gnomad MID

AF:

0.00

Gnomad NFE

AF:

0.00

Gnomad OTH

AF:

0.00

GnomAD3 exomes

AF:

0.0000278

AC:

AN:

251458

Hom.:

AF XY:

0.0000221

AC XY:

AN XY:

135914

show subpopulations

Gnomad AFR exome

AF:

0.00

Gnomad AMR exome

AF:

0.00

Gnomad ASJ exome

AF:

0.00

Gnomad EAS exome

AF:

0.0000544

Gnomad SAS exome

AF:

0.0000653

Gnomad FIN exome

AF:

0.00

Gnomad NFE exome

AF:

0.0000352

Gnomad OTH exome

AF:

0.00

GnomAD4 exome

AF:

0.0000274

AC:

AN:

1461892

Hom.:

Cov.:

AF XY:

0.0000261

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:

0.000126

Gnomad4 SAS exome

AF:

0.0000348

Gnomad4 FIN exome

AF:

0.00

Gnomad4 NFE exome

AF:

0.0000279

Gnomad4 OTH exome

AF:

0.0000166

GnomAD4 genome

AF:

0.0000131

AC:

AN:

152140

Hom.:

Cov.:

AF XY:

0.0000135

AC XY:

AN XY:

74322

show subpopulations

Gnomad4 AFR

AF:

0.0000241

Gnomad4 AMR

AF:

0.00

Gnomad4 ASJ

AF:

0.00

Gnomad4 EAS

AF:

0.000193

Gnomad4 SAS

AF:

0.00

Gnomad4 FIN

AF:

0.00

Gnomad4 NFE

AF:

0.00

Gnomad4 OTH

AF:

0.00

Bravo

AF:

0.00000756

ExAC

AF:

0.0000494

AC:

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:5

Revision: criteria provided, multiple submitters, no conflicts

LINK: link

Submissions by phenotype

not specified

Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Laboratory for Molecular Medicine, Mass General Brigham Personalized Medicine

Oct 22, 2014

Variant classified as Uncertain Significance - Favor Benign. The p.Thr1253Met va riant in MHY6 has not been previously reported in individuals with cardiomyopath y or in large population studies. Threonine (Thr) at position 1253 is not conser ved in mammals or in evolutionarily distant species and 2 mammals (macaque and m anatee) have a methionine (Met) at this position, suggesting that this change ma y be tolerated. Additional computational prediction tools suggest that the p.Thr 1253Met variant may impact the protein, though this information is not predictiv e enough to determine pathogenicity. In summary, while the clinical significance of the p.Thr1253Met variant is uncertain, the presence of the variant amino aci d in other mammals suggests that it is more likely to be benign. -

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

Uncertain significance, criteria provided, single submitter

clinical testing

Fulgent Genetics, Fulgent Genetics

Sep 07, 2021

- -

not provided

Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

GeneDx

Feb 02, 2017

The T1253M variant in the MYH6 gene has been reported previously in an individual with sporadic dilated cardiomyopathy (Zhao et al., 2015). The T1253M variant is not observed at a significant frequency in large population cohorts (Lek et al., 2016; 1000 Genomes Consortium et al., 2015; Exome Variant Server). The T1253M variant is a non-conservative amino acid substitution, which is likely to impact secondary protein structure as these residues differ in polarity, charge, size and/or other properties. This substitution occurs at a position that is conserved in mammals. In silico analysis predicts this variant is probably damaging to the protein structure/function. We interpret T1253M as a variant of uncertain significance. -

MYH6-related disorder

Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

PreventionGenetics, part of Exact Sciences

Dec 26, 2023

The MYH6 c.3758C>T variant is predicted to result in the amino acid substitution p.Thr1253Met. This variant was reported in an individual with dilated cardiomyopathy (Zhao et al. 2015. PubMed ID: 26458567) and an individual with left ventricular noncompaction (Table S2, Mazzarotto et al. 2021. PubMed ID: 33500567). This variant is reported in 0.010% of alleles in individuals of East Asian descent in gnomAD and has been interpreted as uncertain in ClinVar (https://www.ncbi.nlm.nih.gov/clinvar/variation/164229/). 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

Uncertain significance, criteria provided, single submitter

clinical testing

Ambry Genetics

Feb 17, 2021

The p.T1253M variant (also known as c.3758C>T), located in coding exon 25 of the MYH6 gene, results from a C to T substitution at nucleotide position 3758. The threonine at codon 1253 is replaced by methionine, an amino acid with similar properties. This variant was reported in a dilated cardiomyopathy (DCM) cohort in China, with limited clinical details provided (Zhao Y et al. Int J Mol Med, 2015 Dec;36:1479-86). This amino acid position is well conserved in available vertebrate species; however, methionine is the reference amino acid in other vertebrate species. In addition, the in silico prediction for this alteration is inconclusive. 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

0.091

BayesDel_addAF

Benign

-0.082

BayesDel_noAF

Benign

-0.17

Cadd

Uncertain

Dann

Pathogenic

1.0

DEOGEN2

Uncertain

0.66

D;D

Eigen

Uncertain

0.62

Eigen_PC

Uncertain

0.56

FATHMM_MKL

Pathogenic

0.97

LIST_S2

Benign

0.80

T;.

M_CAP

Benign

0.067

MetaRNN

Pathogenic

0.79

D;D

MetaSVM

Uncertain

0.44

MutationAssessor

Uncertain

2.1

M;M

MutationTaster

Benign

1.0

D;D

PrimateAI

Benign

0.48

PROVEAN

Uncertain

-3.2

D;D

REVEL

Uncertain

0.48

Sift

Uncertain

0.026

D;D

Sift4G

Benign

0.12

T;T

Polyphen

1.0

D;D

Vest4

0.68

MutPred

0.45

Gain of catalytic residue at T1253 (P = 6e-04);Gain of catalytic residue at T1253 (P = 6e-04);

MVP

0.97

MPC

0.81

ClinPred

0.87

GERP RS

4.5

Varity_R

0.083

gMVP

0.43

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