rs149460065

Positions:

chr14-23386368-G-A

Variant summary

Our verdict is Benign. Variant got -19 ACMG points: 1P and 20B. PP2BP4_StrongBP6_Very_StrongBS1BS2

The NM_002471.4(MYH6):c.4906C>T(p.Arg1636Cys) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.000221 in 1,614,170 control chromosomes in the GnomAD database, including 3 homozygotes. In-silico tool predicts a benign outcome for this variant. Variant has been reported in ClinVar as Likely benign (★★). Another variant affecting the same amino acid position, but resulting in a different missense (i.e. R1636H) has been classified as Uncertain significance.

Frequency

Genomes: 𝑓 0.0011 ( 0 hom., cov: 32)

Exomes 𝑓: 0.00013 ( 3 hom. )

Consequence

MYH6
NM_002471.4 missense

Scores

Clinical Significance

Benign/Likely benign criteria provided, multiple submitters, no conflicts B:8

Conservation

PhyloP100: -0.382

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 Benign. Variant got -19 ACMG points.

PP2

Missense variant where missense usually causes diseases, MYH6

BP4

Computational evidence support a benign effect (MetaRNN=0.023067027).

BP6

Variant 14-23386368-G-A is Benign according to our data. Variant chr14-23386368-G-A is described in ClinVar as [Likely_benign]. Clinvar id is 44525.Status of the report is criteria_provided_multiple_submitters_no_conflicts, 2 stars. Variant chr14-23386368-G-A is described in Lovd as [Benign].

BS1

Variant frequency is greater than expected in population afr. gnomad4 allele frequency = 0.00111 (169/152306) while in subpopulation AFR AF= 0.00395 (164/41564). AF 95% confidence interval is 0.00345. There are 0 homozygotes in gnomad4. There are 84 alleles in male gnomad4 subpopulation. Median coverage is 32. This position pass quality control queck.

BS2

High AC in GnomAd4 at 169 AD gene.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
MYH6	NM_002471.4 linkuse as main transcript	c.4906C>T	p.Arg1636Cys	missense_variant	33/39	ENST00000405093.9

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
MYH6	ENST00000405093.9 linkuse as main transcript	c.4906C>T	p.Arg1636Cys	missense_variant	33/39	5	NM_002471.4	P1

Frequencies

GnomAD3 genomes

AF:

0.00108

AC:

165

AN:

152188

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.00386

Gnomad AMI

AF:

0.00

Gnomad AMR

AF:

0.000262

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:

0.00

Gnomad OTH

AF:

0.000478

GnomAD3 exomes

AF:

0.000306

AC:

AN:

251400

Hom.:

AF XY:

0.000272

AC XY:

AN XY:

135890

show subpopulations

Gnomad AFR exome

AF:

0.00431

Gnomad AMR exome

AF:

0.000145

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:

0.00000880

Gnomad OTH exome

AF:

0.000163

GnomAD4 exome

AF:

0.000128

AC:

187

AN:

1461864

Hom.:

Cov.:

AF XY:

0.000117

AC XY:

AN XY:

727230

show subpopulations

Gnomad4 AFR exome

AF:

0.00460

Gnomad4 AMR exome

AF:

0.000157

Gnomad4 ASJ exome

AF:

0.00

Gnomad4 EAS exome

AF:

0.00

Gnomad4 SAS exome

AF:

0.0000232

Gnomad4 FIN exome

AF:

0.00

Gnomad4 NFE exome

AF:

0.00000540

Gnomad4 OTH exome

AF:

0.000298

GnomAD4 genome

AF:

0.00111

AC:

169

AN:

152306

Hom.:

Cov.:

AF XY:

0.00113

AC XY:

AN XY:

74484

show subpopulations

Gnomad4 AFR

AF:

0.00395

Gnomad4 AMR

AF:

0.000261

Gnomad4 ASJ

AF:

0.00

Gnomad4 EAS

AF:

0.00

Gnomad4 SAS

AF:

0.00

Gnomad4 FIN

AF:

0.00

Gnomad4 NFE

AF:

0.00

Gnomad4 OTH

AF:

0.000473

Alfa

AF:

0.000424

Hom.:

Bravo

AF:

0.00121

ESP6500AA

AF:

0.00409

AC:

ESP6500EA

AF:

0.00

AC:

ExAC

AF:

0.000428

AC:

ClinVar

Significance: Benign/Likely benign

Submissions summary: Benign:8

Revision: criteria provided, multiple submitters, no conflicts

LINK: link

Submissions by phenotype

not specified

Benign:5

Benign, no assertion criteria provided	clinical testing	Clinical Genetics, Academic Medical Center	-	- -
Benign, no assertion criteria provided	clinical testing	Clinical Genetics DNA and cytogenetics Diagnostics Lab, Erasmus MC, Erasmus Medical Center	-	- -
Benign, no assertion criteria provided	clinical testing	Genome Diagnostics Laboratory, University Medical Center Utrecht	-	- -
Likely benign, criteria provided, single submitter	clinical testing	Laboratory for Molecular Medicine, Mass General Brigham Personalized Medicine	Mar 06, 2013	Arg1636Cys in exon 33 of MYH6: This variant is not expected to have clinical sig nificance because it has been identified in 0.4% (18/4406) of African American c hromosomes from a broad population by the NHLBI Exome Sequencing Project (http:/ /evs.gs.washington.edu/EVS/; dbSNP rs149460065). Arg1636Cys in exon 33 of MYH6 (rs149460065; allele frequency = 0.4%, 18/4406) ** -
Likely benign, criteria provided, single submitter	clinical testing	Women's Health and Genetics/Laboratory Corporation of America, LabCorp	Nov 11, 2019	Variant summary: MYH6 c.4906C>T (p.Arg1636Cys) results in a non-conservative amino acid change located in the Myosin tail domain (IPR002928) of the encoded protein sequence. Five of five in-silico tools predict a damaging effect of the variant on protein function. The variant allele was found at a frequency of 0.00037 in 282768 control chromosomes, predominantly at a frequency of 0.004 within the African or African-American subpopulation in the gnomAD database. The observed variant frequency within African or African-American control individuals in the gnomAD database is approximately 160 fold the estimated maximal expected allele frequency for a pathogenic variant in MYH6 causing Cardiomyopathy phenotype (2.5e-05), strongly suggesting that the variant is a benign polymorphism found primarily in populations of African or African-American origin. c.4906C>T has been reported in the literature in an individual affected with sudden cardiac death (Seidelmann_2017). This report however, does not provide unequivocal conclusions about association of the variant with Cardiomyopathy. To our knowledge, no experimental evidence demonstrating an impact on protein function has been reported. Three ClinVar submitters (evaluation after 2014) cite the variant as likely benign (n=2) and uncertain significance (n=1). Based on the evidence outlined above, the variant was classified as likely benign. -

Hypertrophic cardiomyopathy 14

Benign:1

Likely benign, criteria provided, single submitter

clinical testing

Invitae

Jan 13, 2024

- -

not provided

Benign:1

Likely benign, criteria provided, single submitter

clinical testing

GeneDx

May 15, 2020

- -

Cardiovascular phenotype

Benign:1

Benign, criteria provided, single submitter

clinical testing

Ambry Genetics

Nov 30, 2018

This alteration is classified as 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

AlphaMissense

Benign

0.27

BayesDel_addAF

Benign

-0.014

BayesDel_noAF

Pathogenic

0.21

CADD

Benign

DANN

Uncertain

1.0

DEOGEN2

Pathogenic

0.85

D;D

Eigen

Benign

-0.25

Eigen_PC

Benign

-0.60

FATHMM_MKL

Benign

0.18

LIST_S2

Uncertain

0.95

D;.

M_CAP

Uncertain

0.15

MetaRNN

Benign

0.023

T;T

MetaSVM

Uncertain

0.53

MutationAssessor

Pathogenic

3.0

M;M

MutationTaster

Benign

1.0

D;D

PrimateAI

Uncertain

0.55

PROVEAN

Pathogenic

-5.6

D;D

REVEL

Uncertain

0.58

Sift

Uncertain

0.0040

D;D

Sift4G

Pathogenic

0.0

D;D

Polyphen

1.0

D;D

Vest4

0.59

MVP

0.90

MPC

1.1

ClinPred

0.23

GERP RS

-6.4

Varity_R

0.27

gMVP

0.66

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