chr14-23422291-C-A

Position:

chr14-23422291-C-A

Variant summary

Our verdict is Likely pathogenic. Variant got 7 ACMG points: 7P and 0B. PM2PP3PS4_ModeratePP1_Moderate

This summary comes from the ClinGen Evidence Repository: The c.3134G>T (p.Arg1045Leu) variant in MYH7 has been reported in at least 15 individuals with HCM (PS4_Moderate; Cann 2017 PMID:27000522; Sheikh 2018 PMID:29764897, Walsh 2017 PMID:27532257; GeneDx pers. comm., Invitae pers. comm., LMM pers. comm., OMGL pers. comm.), 4 of whom also had additional variants in other HCM-associated genes (GeneDx pers. comm., Invitae pers. comm., LMM pers. comm.). Because of the additional variants observed in multiple cases, PS4 was downgraded to Moderate. This variant also segregated with HCM in 6 affected relatives from 3 families (PP1_Moderate; Cann 2017 PMID:27000522; GeneDx pers. comm., LMM pers. comm., OMGL pers. comm.). This variant has also been identified in 0.001% (FAF 95% CI, 4/113744) of European chromosomes in gnomAD v2.1.1 (https://gnomad.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. MYH7-specific ACMG/AMP criteria applied (Kelly 2018 PMID:29300372): PS4_Moderate; PP1_Moderate; PM2; PP3. LINK:https://erepo.genome.network/evrepo/ui/classification/CA013375/MONDO:0005045/002

Frequency

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

Exomes 𝑓: 0.000016 ( 0 hom. )

Consequence

MYH7
NM_000257.4 missense

Scores

Clinical Significance

Likely pathogenic reviewed by expert panel P:9

Conservation

PhyloP100: 7.76

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:

Genome browser will be placed here

ACMG classification

Classification made for transcript

Verdict is Likely_pathogenic. Variant got 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.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
MYH7	NM_000257.4 linkuse as main transcript	c.3134G>T	p.Arg1045Leu	missense_variant	25/40	ENST00000355349.4	NP_000248.2	P12883
MYH7	NM_001407004.1 linkuse as main transcript	c.3134G>T	p.Arg1045Leu	missense_variant	24/39		NP_001393933.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
MYH7	ENST00000355349.4 linkuse as main transcript	c.3134G>T	p.Arg1045Leu	missense_variant	25/40	1	NM_000257.4	ENSP00000347507.3		P12883

Frequencies

GnomAD3 genomes

AF:

0.00000657

AC:

AN:

152164

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:

0.00

Gnomad FIN

AF:

0.00

Gnomad MID

AF:

0.00

Gnomad NFE

AF:

0.0000147

Gnomad OTH

AF:

0.00

GnomAD3 exomes

AF:

0.0000159

AC:

AN:

251460

Hom.:

AF XY:

0.0000147

AC XY:

AN XY:

135904

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:

0.0000352

Gnomad OTH exome

AF:

0.00

GnomAD4 exome

AF:

0.0000157

AC:

AN:

1461888

Hom.:

Cov.:

AF XY:

0.0000165

AC XY:

AN XY:

727246

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:

0.0000171

Gnomad4 OTH exome

AF:

0.0000662

GnomAD4 genome

AF:

0.00000657

AC:

AN:

152164

Hom.:

Cov.:

AF XY:

0.00

AC XY:

AN XY:

74324

show subpopulations

Gnomad4 AFR

AF:

0.00

Gnomad4 AMR

AF:

0.00

Gnomad4 ASJ

AF:

0.00

Gnomad4 EAS

AF:

0.00

Gnomad4 SAS

AF:

0.00

Gnomad4 FIN

AF:

0.00

Gnomad4 NFE

AF:

0.0000147

Gnomad4 OTH

AF:

0.00

Alfa

AF:

0.0000236

Hom.:

Bravo

AF:

0.00000756

ExAC

AF:

0.0000165

AC:

EpiCase

AF:

0.00

EpiControl

AF:

0.0000593

ClinVar

Significance: Likely pathogenic

Submissions summary: Pathogenic:9

Revision: reviewed by expert panel

LINK: link

Submissions by phenotype

Hypertrophic cardiomyopathy

Pathogenic:4

Likely pathogenic, reviewed by expert panel	curation	ClinGen Cardiomyopathy Variant Curation Expert Panel	Aug 25, 2021	The c.3134G>T (p.Arg1045Leu) variant in MYH7 has been reported in at least 15 individuals with HCM (PS4_Moderate; Cann 2017 PMID:27000522; Sheikh 2018 PMID:29764897, Walsh 2017 PMID:27532257; GeneDx pers. comm., Invitae pers. comm., LMM pers. comm., OMGL pers. comm.), 4 of whom also had additional variants in other HCM-associated genes (GeneDx pers. comm., Invitae pers. comm., LMM pers. comm.). Because of the additional variants observed in multiple cases, PS4 was downgraded to Moderate. This variant also segregated with HCM in 6 affected relatives from 3 families (PP1_Moderate; Cann 2017 PMID:27000522; GeneDx pers. comm., LMM pers. comm., OMGL pers. comm.). This variant has also been identified in 0.001% (FAF 95% CI, 4/113744) of European chromosomes in gnomAD v2.1.1 (https://gnomad.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. MYH7-specific ACMG/AMP criteria applied (Kelly 2018 PMID:29300372): PS4_Moderate; PP1_Moderate; PM2; PP3. -
Likely pathogenic, criteria provided, single submitter	clinical testing	Laboratory for Molecular Medicine, Mass General Brigham Personalized Medicine	Dec 18, 2019	The p.Arg1045Leu variant in MYH7 has been identified in at least 11 individuals with hypertrophic cardiomyopathy (HCM) and segregated with disease in 4 affected relatives from 3 families (Cann 2017, Walsh 2017, Invitae pers. comm., GeneDx pers. comm., LMM data). It has also been identified in 1 individual with HCM who carried an additional pathogenic variant in MYH7 (LMM data). This variant has also reported by other clinical laboratories in ClinVar (Variation ID#42948) and has been identified in 0.004% (4/113744) of European chromosomes by gnomAD (http://gnomad.broadinstitute.org). Computational prediction tools and conservation analyses suggest that this variant may impact the protein, though this information is not predictive enough to determine pathogenicity. Another variant involving this codon (p.Arg1045Cys) has been identified in individuals with HCM and is classified as likely pathogenic by this laboratory. In summary, although additional studies are required to fully establish its clinical significance, this variant meets criteria to be classified as likely pathogenic for autosomal dominant HCM. ACMG/AMP Criteria applied: PM2, PP1, PP3, PS4_Moderate, PM5_Supporting. -
Pathogenic, criteria provided, single submitter	clinical testing	Labcorp Genetics (formerly Invitae), Labcorp	Dec 31, 2023	This sequence change replaces arginine, which is basic and polar, with leucine, which is neutral and non-polar, at codon 1045 of the MYH7 protein (p.Arg1045Leu). This variant is present in population databases (rs397516178, gnomAD 0.004%). This missense change has been observed in individuals with hypertrophic cardiomyopathy and dilated cardiomyopathy (PMID: 27532257). ClinVar contains an entry for this variant (Variation ID: 42948). Advanced modeling of protein sequence and biophysical properties (such as structural, functional, and spatial information, amino acid conservation, physicochemical variation, residue mobility, and thermodynamic stability) performed at Invitae indicates that this missense variant is expected to disrupt MYH7 protein function with a positive predictive value of 95%. This variant disrupts the p.Arg1045 amino acid residue in MYH7. Other variant(s) that disrupt this residue have been determined to be pathogenic (PMID: 18533079, 20215591, 24793961, 26914223, 27247418, 27532257). This suggests that this residue is clinically significant, and that variants that disrupt this residue are likely to be disease-causing. For these reasons, this variant has been classified as Pathogenic. -
Likely pathogenic, criteria provided, single submitter	clinical testing	All of Us Research Program, National Institutes of Health	Sep 27, 2024	This missense variant replaces arginine with leucine at codon 1045 in the neck and hinge domain of the MYH7 protein. Computational prediction tools indicate that this variant has a deleterious impact on protein structure and function. To our knowledge, functional studies have not been reported for this variant. This variant has been reported in over 10 individuals affected with hypertrophic cardiomyopathy (PMID: 27000522, 27532257, 29764897, 33495596, 33495597; ClinVar SCV001976477.1). Several of these individuals also carried variants in other genes associated with hypertrophic cardiomyopathy (ClinVar SCV001976477.1). It has been shown that this variant segregates with disease in 6 affected individuals across 3 families (ClinVar SCV001976477.1). This variant has also been reported in one individual affected with dilated cardiomyopathy (PMID: 35732239). This variant has been identified in 4/251460 chromosomes in the general population by the Genome Aggregation Database (gnomAD). A different variant affecting the same codon, p.Arg1045Cys, is considered to be disease-causing (ClinVar variation ID: 177753), suggesting that arginine at this position is important for MYH7 protein function. Based on the available evidence, this variant is classified as Likely Pathogenic. -

Cardiomyopathy

Pathogenic:1

Likely pathogenic, criteria provided, single submitter

clinical testing

Color Diagnostics, LLC DBA Color Health

Dec 13, 2023

This missense variant replaces arginine with leucine at codon 1045 in the neck and hinge domain of the MYH7 protein. Computational prediction tools indicate that this variant has a deleterious impact on protein structure and function. To our knowledge, functional studies have not been reported for this variant. This variant has been reported in over 10 individuals affected with hypertrophic cardiomyopathy (PMID: 27000522, 27532257, 29764897, 33495596, 33495597; ClinVar SCV001976477.1). Several of these individuals also carried variants in other genes associated with hypertrophic cardiomyopathy (ClinVar SCV001976477.1). It has been shown that this variant segregates with disease in 6 affected individuals across 3 families (ClinVar SCV001976477.1). This variant has also been reported in one individual affected with dilated cardiomyopathy (PMID: 35732239). This variant has been identified in 4/251460 chromosomes in the general population by the Genome Aggregation Database (gnomAD). A different variant affecting the same codon, p.Arg1045Cys, is considered to be disease-causing (ClinVar variation ID: 177753), suggesting that arginine at this position is important for MYH7 protein function. Based on the available evidence, this variant is classified as Likely Pathogenic. -

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

Pathogenic:1

Likely pathogenic, criteria provided, single submitter

clinical testing

Fulgent Genetics, Fulgent Genetics

Sep 23, 2021

- -

not provided

Pathogenic:1

Likely pathogenic, criteria provided, single submitter

clinical testing

GeneDx

Aug 12, 2024

Reported in patients with HCM in published literature (PMID: 34503678, 27000522, 25611685, 27532257); Identified in patient with DCM and LVNC requiring heart transplant who harbored a second variant in MYH7 (PMID: 35732239); Not observed at significant frequency in large population cohorts (gnomAD); 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: 25611685, 27532257, 27247418, 34503678, 27000522, 1976477, 31447099, 34636345, 35653365, 26914223, 37652022, 34542152, 29764897, 19659763, 33495596, 33495597, 35732239) -

Cardiovascular phenotype

Pathogenic:1

Likely pathogenic, criteria provided, single submitter

clinical testing

Ambry Genetics

Dec 12, 2022

The p.R1045L variant (also known as c.3134G>T), located in coding exon 23 of the MYH7 gene, results from a G to T substitution at nucleotide position 3134. The arginine at codon 1045 is replaced by leucine, an amino acid with dissimilar properties. This variant was reported in numerous hypertrophic cardiomyopathy cohorts and has been reported to segregate with disease in several families (Alfares AA et al. Genet. Med., 2015 Nov;17:880-8; Walsh R et al. Genet. Med., 2017 02;19:192-203; Sheikh N et al. Circulation, 2018 Sep;138:1184-1194; GeneDx pers comm; Invitae pers comm; LMM pers comm; OMGL pers comm). An alternate amino acid substitution at this position, p.R1045C, has also been reported in HCM cases (Olivotto I et al. Mayo Clin. Proc., 2008 Jun;83:630-8). This amino acid position is highly conserved in available vertebrate species. In addition, this alteration is predicted to be deleterious by in silico analysis. Based on the majority of available evidence to date, this variant is likely to be pathogenic. -

Hypertrophic cardiomyopathy 1

Pathogenic:1

Likely pathogenic, criteria provided, single submitter

clinical testing

Human Genome Sequencing Center Clinical Lab, Baylor College of Medicine

Oct 12, 2018

This c.3134G>T (p.Arg1045Leu) variant in the MYH7 gene has been reported in at least three unrelated patients with hypertrophic cardiomyopathy (PMID 25611685, 26914223, 27247418) and is extremely rare in general population databases. A second variant in the same codon, p. Arg1045His was classified likely pathogenic by our laboratory. A third variant at this codon, p.Arg1045Cys was classified as likely pathogenic by expert panel in the Clinvar database, suggesting this arginine residue is critical for MYH7 protein function. Multiple lines of prediction algorithms support the deleterious effect of the c.3134G>T (p.Arg1045Leu) variant. Therefore, this c.3134G>T (p.Arg1045Leu) variant in the MYH7 gene is classified as likely pathogenic. -

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

AlphaMissense

Pathogenic

0.78

CardioboostCm

Pathogenic

0.99

BayesDel_addAF

Pathogenic

0.47

BayesDel_noAF

Pathogenic

0.54

CADD

Pathogenic

DANN

Uncertain

1.0

DEOGEN2

Pathogenic

0.84

Eigen

Pathogenic

1.0

Eigen_PC

Pathogenic

0.89

FATHMM_MKL

Pathogenic

0.98

LIST_S2

Pathogenic

0.99

M_CAP

Pathogenic

0.97

MetaRNN

Pathogenic

0.93

MetaSVM

Pathogenic

1.1

MutationAssessor

Pathogenic

4.1

PrimateAI

Pathogenic

0.80

PROVEAN

Pathogenic

-5.5

REVEL

Pathogenic

0.93

Sift

Pathogenic

0.0

Sift4G

Pathogenic

0.0010

Polyphen

1.0

Vest4

0.86

MutPred

0.64

Loss of MoRF binding (P = 0.0262);

MVP

0.98

MPC

1.2

ClinPred

1.0

GERP RS

4.6

Varity_R

0.69

gMVP

0.95

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