Genetic Variant MYH7:p.Arg1712Trp (chr14-23415652-G-A) – ACMG Classification: Likely_pathogenic (7 pts)

Variant summary

Our verdict is Likely pathogenic. The variant received 7 ACMG points: 7P and 0B. PS4_ModeratePP1_ModeratePM2PP3

This summary comes from the ClinGen Evidence Repository: The c.5134C>T (p.Arg1712Trp) variant in MYH7 has been reported in the heterozygous state in at least 13 individuals with HCM, 2 of whom also had additional variants in other HCM-associated genes (PS4_Moderate; Hougs 2005 PMID:15483641; Gruner 2011 PMID:21511876; Jensen 2013 PMID:23197161; Hagen 2013 PMID:24498601; Mu 2019 https://www.actamedicamediterranea.com/archive/2019/medica-5/pathogenic-mutation-detection-and-correlation-analysis-between-genotype-and-phenotype-of-familial-hypertrophic-cardiomyopathy-in-chinese-han-nationality/pdf; Ambry pers. comm.; Centenary Institute Sydney pers. comm.; CHEO pers. comm.; GeneDx pers. comm.; Invitae pers. comm.; LMM pers. comm.; OMGL pers. comm.). This variant segregated with HCM in at least 6 affected relatives from 4 families (PP1_Moderate; Hougs 2005 PMID:15483641; Mu 2019; Ambry pers comm.; Centenary Institute Sydney pers comm.). This variant has also been identified in the homozygous state in 2 siblings from a consanguineous family with myopathy and normal cardiac function (Beecroft 2019 PMID:31130376). Data from the gnomAD population database (v2.1.1) is insufficient to assess the frequency of this variant; however, this variant is absent from the ExAC database (PM2; http://gnomad.broadinstitute.org; http://exac.broadinstitute.org). Computational prediction tools and conservation analysis suggest that this variant may impact the protein (PP3). In summary, this variant meets criteria to be classified as likely pathogenic for hypertrophic cardiomyopathy in an autosomal dominant manner. ACMG/AMP Criteria applied: PS4_Moderate; PP1_Moderate; PM2; PP3. LINK:https://erepo.genome.network/evrepo/ui/classification/CA015719/MONDO:0005045/002

Frequency

Genomes: 𝑓 0.0000066 ( 0 hom., cov: 32)

Exomes 𝑓: 0.0000062 ( 0 hom. )

Consequence

MYH7
NM_000257.4 missense

Scores

Clinical Significance

Likely pathogenic reviewed by expert panel P:11

Conservation

PhyloP100: 0.178

Publications

20 publications found

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 was made for transcript

Our verdict: Likely_pathogenic. The variant received 7 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.

PP1

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

PP3

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

Variant Effect in Transcripts

ACMG analysis was done for transcript: NM_000257.4. You can select a different transcript below to see updated ACMG assignments.

RefSeq Transcripts

Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
MYH7	NM_000257.4	MANE Select	c.5134C>T	p.Arg1712Trp	missense	Exon 35 of 40	NP_000248.2	P12883
MYH7	NM_001407004.1		c.5134C>T	p.Arg1712Trp	missense	Exon 34 of 39	NP_001393933.1	P12883
MHRT	NR_126491.1		n.84G>A		non_coding_transcript_exon	Exon 2 of 6

Ensembl Transcripts

Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
MYH7	ENST00000355349.4	TSL:1 MANE Select	c.5134C>T	p.Arg1712Trp	missense	Exon 35 of 40	ENSP00000347507.3	P12883
MYH7	ENST00000858540.1		c.5134C>T	p.Arg1712Trp	missense	Exon 35 of 40	ENSP00000528599.1
MYH7	ENST00000965955.1		c.5134C>T	p.Arg1712Trp	missense	Exon 35 of 40	ENSP00000636014.1

Frequencies

GnomAD3 genomes

AF:

0.00000657

AC:

AN:

152184

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.00

Gnomad AMI

AF:

0.00

Gnomad AMR

AF:

0.00

Gnomad ASJ

AF:

0.00

Gnomad EAS

AF:

0.00

Gnomad SAS

AF:

0.000207

Gnomad FIN

AF:

0.00

Gnomad MID

AF:

0.00

Gnomad NFE

AF:

0.00

Gnomad OTH

AF:

0.00

GnomAD2 exomes

AF:

0.00

AC:

AN:

250888

AF XY:

0.00

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 FIN exome

AF:

0.00

Gnomad NFE exome

AF:

0.00

Gnomad OTH exome

AF:

0.00

GnomAD4 exome

AF:

0.00000616

AC:

AN:

1461454

Hom.:

Cov.:

AF XY:

0.00000825

AC XY:

AN XY:

727022

show subpopulations

African (AFR)

AF:

0.00

AC:

AN:

33476

American (AMR)

AF:

0.00

AC:

AN:

44724

Ashkenazi Jewish (ASJ)

AF:

0.00

AC:

AN:

26136

East Asian (EAS)

AF:

0.00

AC:

AN:

39700

South Asian (SAS)

AF:

0.00

AC:

AN:

86256

European-Finnish (FIN)

AF:

0.00

AC:

AN:

53098

Middle Eastern (MID)

AF:

0.00

AC:

AN:

5690

European-Non Finnish (NFE)

AF:

0.00000719

AC:

AN:

1112000

Other (OTH)

AF:

0.0000166

AC:

AN:

60374

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.464

Heterozygous variant carriers

0.00

0.20

0.40

0.60

0.80

0.95

Allele balance

Age Distribution

Exome Het

Variant carriers

<30

30-35

35-40

40-45

45-50

50-55

55-60

60-65

65-70

70-75

75-80

>80

Age

GnomAD4 genome

AF:

0.00000657

AC:

AN:

152184

Hom.:

Cov.:

AF XY:

0.0000135

AC XY:

AN XY:

74338

show subpopulations

African (AFR)

AF:

0.00

AC:

AN:

41450

American (AMR)

AF:

0.00

AC:

AN:

15280

Ashkenazi Jewish (ASJ)

AF:

0.00

AC:

AN:

3470

East Asian (EAS)

AF:

0.00

AC:

AN:

5188

South Asian (SAS)

AF:

0.000207

AC:

AN:

4824

European-Finnish (FIN)

AF:

0.00

AC:

AN:

10612

Middle Eastern (MID)

AF:

0.00

AC:

AN:

316

European-Non Finnish (NFE)

AF:

0.00

AC:

AN:

68038

Other (OTH)

AF:

0.00

AC:

AN:

2094

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.525

Heterozygous variant carriers

0.00

0.20

0.40

0.60

0.80

0.95

Allele balance

Age Distribution

Genome Het

Variant carriers

<30

30-35

35-40

40-45

45-50

50-55

55-60

60-65

65-70

70-75

75-80

>80

Age

Alfa

AF:

0.00

Hom.:

ClinVar

ClinVar submissions

Significance:Likely pathogenic

Revision:reviewed by expert panel

View on ClinVar

Pathogenic

VUS

Benign

Condition

Hypertrophic cardiomyopathy (4)

not provided (2)

Cardiovascular phenotype (1)

Hypertrophic cardiomyopathy 1 (1)

MYH7-related disorder (1)

Myopathy, myosin storage, autosomal recessive (1)

Primary familial hypertrophic cardiomyopathy (1)

Computational scores

Source: dbNSFP v4.9

Name

Calibrated prediction

Score

Prediction

AlphaMissense

Pathogenic

0.76

CardioboostCm

Pathogenic

0.99

BayesDel_addAF

Pathogenic

0.31

BayesDel_noAF

Pathogenic

0.20

CADD

Pathogenic

(source)

DANN

Pathogenic

1.0

DEOGEN2

Pathogenic

0.91

Eigen

Uncertain

0.67

Eigen_PC

Uncertain

0.54

FATHMM_MKL

Uncertain

0.85

LIST_S2

Pathogenic

0.99

M_CAP

Pathogenic

0.87

MetaRNN

Pathogenic

0.92

MetaSVM

Uncertain

0.78

MutationAssessor

Pathogenic

4.2

PhyloP100

0.18

PrimateAI

Pathogenic

0.88

PROVEAN

Pathogenic

-4.9

REVEL

Pathogenic

0.81

Sift

Pathogenic

0.0

Sift4G

Pathogenic

0.0

Polyphen

1.0

Vest4

0.89

MutPred

0.58

Loss of disorder (P = 0.0615)

MVP

0.97

MPC

1.1

ClinPred

1.0

GERP RS

4.5

Varity_R

0.54

gMVP

0.84

Mutation Taster

=12/88

disease causing (ClinVar)

(source)

Splicing

Name

Calibrated prediction

Score

Prediction

SpliceAI score (max)

0.38

Details are displayed if max score is > 0.2

DS_DG_spliceai

0.38

Position offset: 6

Find out detailed SpliceAI scores and Pangolin per-transcript scores at spliceailookup.broadinstitute.org

Publications

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Variant summary

Frequency

Consequence

Scores

Clinical Significance

Conservation

Publications

ACMG classification

Variant Effect in Transcripts

RefSeq Transcripts

Ensembl Transcripts

Frequencies

Age Distribution

Age Distribution

ClinVar

Computational scores

Splicing

Publications

Other links and lift over