rs2754155

Variant names:

• chr14-23416946-A-G
• rs2754155
• NM_000257.4:c.4566T>C

Variant summary

Our verdict is Benign. Variant got -8 ACMG points: 0P and 8B. BA1

This summary comes from the ClinGen Evidence Repository: The filtering allele frequency of the c.4566T>C (p.Thr1522=) variant in the MYH7 gene is 2.98% (376/11574) of Latino chromosomes by the Exome Aggregation Consortium (http://exac.broadinstitute.org), which is a high enough frequency to be classified as benign based on thresholds defined by the ClinGen Inherited Cardiomyopathy Expert Panel (BA1; PMID:29300372). LINK:https://erepo.genome.network/evrepo/ui/classification/CA015116/MONDO:0004994/002

• Frequency:
  • Genomes: 𝑓 0.0089 (16 hom., cov: 33)
  • Exomes 𝑓: 0.0095 (132 hom.)
• Consequence: MYH7 NM_000257.4 synonymous
• Clinical Significance: Benign reviewed by expert panel B:21
• Conservation: PhyloP100: -0.423

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]

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]

ACMG classification

Verdict is Benign. Variant got -8 ACMG points.

• BA1: For more information check the summary or visit ClinGen Evidence Repository.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
MYH7	NM_000257.4	c.4566T>C	p.Thr1522Thr	synonymous_variant	Exon 33 of 40	ENST00000355349.4	NP_000248.2
MYH7	NM_001407004.1	c.4566T>C	p.Thr1522Thr	synonymous_variant	Exon 32 of 39		NP_001393933.1
MHRT	NR_126491.1	n.589A>G		non_coding_transcript_exon_variant	Exon 4 of 6

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
MYH7	ENST00000355349.4	c.4566T>C	p.Thr1522Thr	synonymous_variant	Exon 33 of 40	1	NM_000257.4	ENSP00000347507.3

Frequencies

GnomAD3 genomes AF: 0.00893 AC: 1360 AN: 152212 Hom.: 16 Cov.: 33

Gnomad AFR AF: 0.00217

Gnomad AMI AF: 0.00

Gnomad AMR AF: 0.0174

Gnomad ASJ AF: 0.00864

Gnomad EAS AF: 0.000193

Gnomad SAS AF: 0.0265

Gnomad FIN AF: 0.0149

Gnomad MID AF: 0.0158

Gnomad NFE AF: 0.00967

Gnomad OTH AF: 0.0115

GnomAD3 exomes AF: 0.0134 AC: 3367 AN: 251480 Hom.: 53 AF XY: 0.0139 AC XY: 1883 AN XY: 135916

Gnomad AFR exome AF: 0.00240

Gnomad AMR exome AF: 0.0319

Gnomad ASJ exome AF: 0.00813

Gnomad EAS exome AF: 0.000109

Gnomad SAS exome AF: 0.0281

Gnomad FIN exome AF: 0.0120

Gnomad NFE exome AF: 0.00833

Gnomad OTH exome AF: 0.0117

GnomAD4 exome AF: 0.00955 AC: 13954 AN: 1461882 Hom.: 132 Cov.: 34 AF XY: 0.0103 AC XY: 7483 AN XY: 727236

Gnomad4 AFR exome AF: 0.00203

Gnomad4 AMR exome AF: 0.0295

Gnomad4 ASJ exome AF: 0.00715

Gnomad4 EAS exome AF: 0.0000504

Gnomad4 SAS exome AF: 0.0293

Gnomad4 FIN exome AF: 0.0125

Gnomad4 NFE exome AF: 0.00771

Gnomad4 OTH exome AF: 0.00831

GnomAD4 genome AF: 0.00891 AC: 1358 AN: 152330 Hom.: 16 Cov.: 33 AF XY: 0.00932 AC XY: 694 AN XY: 74496

Gnomad4 AFR AF: 0.00216

Gnomad4 AMR AF: 0.0174

Gnomad4 ASJ AF: 0.00864

Gnomad4 EAS AF: 0.000193

Gnomad4 SAS AF: 0.0261

Gnomad4 FIN AF: 0.0149

Gnomad4 NFE AF: 0.00967

Gnomad4 OTH AF: 0.0113

Alfa AF: 0.00899 Hom.: 1

Bravo AF: 0.00872

Asia WGS AF: 0.00982 AC: 34 AN: 3478

EpiCase AF: 0.00774

EpiControl AF: 0.00741

ClinVar

Significance: Benign

Submissions summary: Benign:21

Revision: reviewed by expert panel

Submissions by phenotype

not specified Benign:6

-

Clinical Genetics, Academic Medical Center

Significance: Benign

Review Status: no assertion criteria provided

Collection Method: clinical testing

- -

-

PreventionGenetics, part of Exact Sciences

Significance: Benign

Review Status: criteria provided, single submitter

Collection Method: clinical testing

- -

Mar 25, 2008

Laboratory for Molecular Medicine, Mass General Brigham Personalized Medicine

Significance: Benign

Review Status: criteria provided, single submitter

Collection Method: clinical testing

- -

-

Genetic Services Laboratory, University of Chicago

Significance: Likely benign

Review Status: no assertion criteria provided

Collection Method: clinical testing

Likely benign based on allele frequency in 1000 Genomes Project or ESP global frequency and its presence in a patient with a rare or unrelated disease phenotype. NOT Sanger confirmed. -

-

Clinical Genetics DNA and cytogenetics Diagnostics Lab, Erasmus MC, Erasmus Medical Center

Significance: Benign

Review Status: no assertion criteria provided

Collection Method: clinical testing

- -

-

Joint Genome Diagnostic Labs from Nijmegen and Maastricht, Radboudumc and MUMC+

Significance: Benign

Review Status: no assertion criteria provided

Collection Method: clinical testing

- -

not provided Benign:5

-

Breakthrough Genomics, Breakthrough Genomics

Significance: Benign

Review Status: criteria provided, single submitter

Collection Method: not provided

- -

-

Diagnostic Laboratory, Department of Genetics, University Medical Center Groningen

Significance: Likely benign

Review Status: no assertion criteria provided

Collection Method: clinical testing

- -

-

Laboratory of Diagnostic Genome Analysis, Leiden University Medical Center (LUMC)

Significance: Likely benign

Review Status: no assertion criteria provided

Collection Method: clinical testing

- -

Mar 03, 2015

GeneDx

Significance: Benign

Review Status: criteria provided, single submitter

Collection Method: clinical testing

- -

Oct 21, 2024

ARUP Laboratories, Molecular Genetics and Genomics, ARUP Laboratories

Significance: Benign

Review Status: criteria provided, single submitter

Collection Method: clinical testing

- -

Cardiomyopathy Benign:2

Mar 05, 2018

Color Diagnostics, LLC DBA Color Health

Significance: Benign

Review Status: criteria provided, single submitter

Collection Method: clinical testing

- -

Dec 15, 2016

ClinGen Cardiomyopathy Variant Curation Expert Panel

Significance: Benign

Review Status: reviewed by expert panel

Collection Method: curation

The filtering allele frequency of the c.4566T>C (p.Thr1522=) variant in the MYH7 gene is 2.98% (376/11574) of Latino chromosomes by the Exome Aggregation Consortium (http://exac.broadinstitute.org), which is a high enough frequency to be classified as benign based on thresholds defined by the ClinGen Inherited Cardiomyopathy Expert Panel (BA1; PMID:29300372). -

Hypertrophic cardiomyopathy Benign:2

Oct 10, 2022

Cohesion Phenomics

Significance: Benign

Review Status: criteria provided, single submitter

Collection Method: clinical testing

- -

Feb 04, 2025

Labcorp Genetics (formerly Invitae), Labcorp

Significance: Benign

Review Status: criteria provided, single submitter

Collection Method: clinical testing

- -

MYH7-related skeletal myopathy Benign:1

Jan 12, 2018

Illumina Laboratory Services, Illumina

Significance: Benign

Review Status: criteria provided, single submitter

Collection Method: clinical testing

This variant was observed in the ICSL laboratory as part of a predisposition screen in an ostensibly healthy population. It had not been previously curated by ICSL or reported in the Human Gene Mutation Database (HGMD: prior to June 1st, 2018), and was therefore a candidate for classification through an automated scoring system. Utilizing variant allele frequency, disease prevalence and penetrance estimates, and inheritance mode, an automated score was calculated to assess if this variant is too frequent to cause the disease. Based on the score and internal cut-off values, a variant classified as benign is not then subjected to further curation. The score for this variant resulted in a classification of benign for this disease. -

Myosin storage myopathy Benign:1

Jan 12, 2018

Illumina Laboratory Services, Illumina

Significance: Benign

Review Status: criteria provided, single submitter

Collection Method: clinical testing

This variant was observed in the ICSL laboratory as part of a predisposition screen in an ostensibly healthy population. It had not been previously curated by ICSL or reported in the Human Gene Mutation Database (HGMD: prior to June 1st, 2018), and was therefore a candidate for classification through an automated scoring system. Utilizing variant allele frequency, disease prevalence and penetrance estimates, and inheritance mode, an automated score was calculated to assess if this variant is too frequent to cause the disease. Based on the score and internal cut-off values, a variant classified as benign is not then subjected to further curation. The score for this variant resulted in a classification of benign for this disease. -

Dilated Cardiomyopathy, Dominant Benign:1

Jun 14, 2016

Illumina Laboratory Services, Illumina

Significance: Likely benign

Review Status: criteria provided, single submitter

Collection Method: clinical testing

- -

Left ventricular noncompaction cardiomyopathy Benign:1

Jun 14, 2016

Illumina Laboratory Services, Illumina

Significance: Likely benign

Review Status: criteria provided, single submitter

Collection Method: clinical testing

- -

Cardiovascular phenotype Benign:1

Jun 19, 2015

Ambry Genetics

Significance: Benign

Review Status: criteria provided, single submitter

Collection Method: clinical testing

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. -

Hypertrophic cardiomyopathy 1 Benign:1

Jan 12, 2018

Illumina Laboratory Services, Illumina

Significance: Likely benign

Review Status: criteria provided, single submitter

Collection Method: clinical testing

This variant was observed in the ICSL laboratory as part of a predisposition screen in an ostensibly healthy population. It had not been previously curated by ICSL or reported in the Human Gene Mutation Database (HGMD: prior to June 1st, 2018), and was therefore a candidate for classification through an automated scoring system. Utilizing variant allele frequency, disease prevalence and penetrance estimates, and inheritance mode, an automated score was calculated to assess if this variant is too frequent to cause the disease. Based on the score and internal cut-off values, a variant classified as likely benign is not then subjected to further curation. The score for this variant resulted in a classification of likely benign for this disease. -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
BayesDel_noAF	Benign	-0.71
CADD	Benign	5.5
DANN	Benign	0.62

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

Other links and lift over

dbSNP: rs2754155; hg19: chr14-23886155;