rs771831848

Positions:

chr14-23427885-T-C

Variant summary

Our verdict is Likely pathogenic. Variant got 7 ACMG points: 7P and 0B. PM1PM2PP2PP3_Moderate

The NM_000257.4(MYH7):c.1588A>G(p.Ile530Val) variant causes a missense change involving the alteration of a conserved nucleotide. The variant allele was found at a frequency of 0.00000137 in 1,461,876 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 Conflicting classifications of pathogenicity (no stars).

Frequency

Genomes: not found (cov: 32)

Exomes 𝑓: 0.0000014 ( 0 hom. )

Consequence

MYH7
NM_000257.4 missense

Scores

Clinical Significance

Conflicting classifications of pathogenicity criteria provided, conflicting classifications P:1U:4

Conservation

PhyloP100: 7.84

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.

PM1

In a hotspot region, there are 7 aminoacids with missense pathogenic changes in the window of +-8 aminoacids around while only 0 benign, 10 uncertain in NM_000257.4

PM2

Very rare variant in population databases, with high coverage;

PP2

Missense variant in gene, where missense usually causes diseases (based on misZ statistic), MYH7. . Gene score misZ 3.9329 (greater than the threshold 3.09). Trascript score misZ 6.7889 (greater than threshold 3.09). GenCC has associacion of gene with hyaline body myopathy, MYH7-related skeletal myopathy, dilated cardiomyopathy 1S, congenital myopathy 7A, myosin storage, autosomal dominant, dilated cardiomyopathy, left ventricular noncompaction, myopathy, myosin storage, autosomal dominant, hypertrophic cardiomyopathy, congenital heart disease, Ebstein anomaly, arrhythmogenic right ventricular cardiomyopathy, myopathy, myosin storage, autosomal recessive, hypertrophic cardiomyopathy 1, familial isolated dilated cardiomyopathy.

PP3

MetaRNN computational evidence supports a deleterious effect, 0.899

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
MYH7	NM_000257.4 linkuse as main transcript	c.1588A>G	p.Ile530Val	missense_variant	16/40	ENST00000355349.4
MYH7	NM_001407004.1 linkuse as main transcript	c.1588A>G	p.Ile530Val	missense_variant	15/39

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
MYH7	ENST00000355349.4 linkuse as main transcript	c.1588A>G	p.Ile530Val	missense_variant	16/40	1	NM_000257.4	P1

Frequencies

GnomAD3 genomes

Cov.:

GnomAD3 exomes

AF:

0.00000398

AC:

AN:

251226

Hom.:

AF XY:

0.00000736

AC XY:

AN XY:

135804

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:

0.0000327

Gnomad FIN exome

AF:

0.00

Gnomad NFE exome

AF:

0.00

Gnomad OTH exome

AF:

0.00

GnomAD4 exome

AF:

0.00000137

AC:

AN:

1461876

Hom.:

Cov.:

AF XY:

0.00000138

AC XY:

AN XY:

727238

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:

0.0000116

Gnomad4 FIN exome

AF:

0.00

Gnomad4 NFE exome

AF:

8.99e-7

Gnomad4 OTH exome

AF:

0.00

GnomAD4 genome

Cov.:

Bravo

AF:

0.00000378

ExAC

AF:

0.00000824

AC:

ClinVar

Significance: Conflicting classifications of pathogenicity

Submissions summary: Pathogenic:1Uncertain:4

Revision: criteria provided, conflicting classifications

LINK: link

Submissions by phenotype

Hypertrophic cardiomyopathy

Pathogenic:1

Pathogenic, criteria provided, single submitter

clinical testing

Invitae

Nov 01, 2022

For these reasons, this variant has been classified as Pathogenic. 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. ClinVar contains an entry for this variant (Variation ID: 520309). This missense change has been observed in individual(s) with hypertrophic cardiomyopathy (PMID: 26162782). In at least one individual the variant was observed to be de novo. This variant is present in population databases (rs771831848, gnomAD 0.003%). This sequence change replaces isoleucine, which is neutral and non-polar, with valine, which is neutral and non-polar, at codon 530 of the MYH7 protein (p.Ile530Val). -

not specified

Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Women's Health and Genetics/Laboratory Corporation of America, LabCorp

Dec 04, 2017

Variant summary: The c.1588A>G (p.Ile530Val) in MYH7 gene is a missense variant involves a highly conserved nucleotide located within theMyosin motor domain of beta (or slow) type I cardiac muscle myosin heavy chain 7. The 4/5 in silico tools predict deleterious outcome for this variant, however no functional studies supporting these predictions were published at the time of evaluation. The c.1588A>G was identified in the control population dataset of gnomAD at a low frequency of 0.000004 (1/ 246008 chrs tested). The observed frequency does not exceed the maximum expected allele frequency for a pathogenic variant of 0.001, suggesting that it is not a common polymorphism. The variant has been reported in at least two individuals with clinical findings suggestive of sarcomeric HCM (Kabed_2015; Homburger_2016), one being a de novo event. Taken together, the variant was classified as VUS-possibly pathogenic, until new information becomes available. -

Cardiomyopathy

Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Color Diagnostics, LLC DBA Color Health

Oct 21, 2019

This missense variant replaces isoleucine with valine at codon 530 of the MYH7 protein. Computational prediction suggests that this variant may have deleterious impact on protein structure and function (internally defined REVEL score threshold >= 0.7, PMID: 27666373). Splice site prediction tools suggest that this variant may not impact RNA splicing. To our knowledge, functional studies have not been performed for this variant. This variant has been reported in individuals affected with hypertrophic cardiomyopathy (PMID: 26162782, 26914223). This variant has been identified in 1/251226 chromosomes in the general population by the Genome Aggregation Database (gnomAD). The available evidence is insufficient to determine the role of this variant in disease conclusively. Therefore, this variant is classified as a Variant of Uncertain Significance. -

not provided

Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

GeneDx

Jan 14, 2020

Reported in ClinVar as a variant of uncertain significance (ClinVar Variant ID# 520309; Landrum et al., 2016); Not observed at a significant frequency in large population cohorts (Lek et al., 2016); In silico analysis, which includes protein predictors and evolutionary conservation, supports that this variant does not alter protein structure/function; This variant is associated with the following publications: (PMID: 26914223, 27247418, 26162782) -

Cardiovascular phenotype

Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Ambry Genetics

Oct 24, 2022

The p.I530V variant (also known as c.1588A>G), located in coding exon 14 of the MYH7 gene, results from an A to G substitution at nucleotide position 1588. The isoleucine at codon 530 is replaced by valine, an amino acid with highly similar properties. This alteration was reported in one individual from a hypertrophic cardiomyopathy (HCM) patient cohort, but clinical details were limited (Murphy SL et al. J Cardiovasc Transl Res 2016;9:153-61). It was also reported in an apparently de novo case in which a patient with characteristics of HCM and athlete's heart exhibited regression of clinical presentation following the cessation of rigorous athletic training (Kebed KY et al. Circ Cardiovasc Imaging, 2015;8:e003312); it is unclear whether this patient was included in the Murphy SL et al. 2016 study. This alteration is located in the myosin head domain, which contains a statistically significant clustering of pathogenic missense variants (Homburger JR et al. Proc Natl Acad Sci U S A, 2016 06;113:6701-6; Walsh R et al. Genet Med, 2017 02;19:192-203; Ambry internal data). 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 variant remains unclear. -

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

AlphaMissense

Benign

0.21

CardioboostCm

Pathogenic

0.91

BayesDel_addAF

Pathogenic

0.32

BayesDel_noAF

Pathogenic

0.32

CADD

Uncertain

DANN

Uncertain

1.0

DEOGEN2

Uncertain

0.62

Eigen

Uncertain

0.32

Eigen_PC

Uncertain

0.41

FATHMM_MKL

Pathogenic

0.98

LIST_S2

Uncertain

0.96

M_CAP

Pathogenic

0.92

MetaRNN

Pathogenic

0.90

MetaSVM

Pathogenic

0.96

MutationAssessor

Uncertain

2.3

MutationTaster

Benign

1.0

PrimateAI

Uncertain

0.76

PROVEAN

Benign

-0.90

REVEL

Pathogenic

0.76

Sift

Pathogenic

0.0

Sift4G

Benign

0.14

Polyphen

0.032

Vest4

0.84

MutPred

0.62

Gain of catalytic residue at I530 (P = 0);

MVP

0.79

MPC

1.5

ClinPred

0.93

GERP RS

4.9

Varity_R

0.75

gMVP

0.92

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