NM_000257.4(MYH7):c.3743T>A (p.Met1248Lys) AND Hypertrophic cardiomyopathy

Germline classification:: Uncertain significance (1 submission)
Last evaluated:: Jan 29, 2024
Review status:: 1 star out of maximum of 4 stars
criteria provided, single submitter

Somatic classification of clinical impact:: None
Review status:: (0/4) 0 stars out of maximum of 4 stars
no assertion criteria provided

Somatic classification of oncogenicity:: None
Review status:: (0/4) 0 stars out of maximum of 4 stars
no assertion criteria provided

Record status:: current
Accession:: RCV000471791.8

Allele description [Variation Report for NM_000257.4(MYH7):c.3743T>A (p.Met1248Lys)]

NM_000257.4(MYH7):c.3743T>A (p.Met1248Lys)

Gene:

MYH7:myosin heavy chain 7 [Gene - OMIM - HGNC]

Variant type:

single nucleotide variant

Cytogenetic location:

14q11.2

Genomic location:

Preferred name:

NM_000257.4(MYH7):c.3743T>A (p.Met1248Lys)

HGVS:

NC_000014.9:g.23419593A>T
NG_007884.1:g.21069T>A
NM_000257.4:c.3743T>AMANE SELECT
NP_000248.2:p.Met1248Lys
LRG_384t1:c.3743T>A
LRG_384:g.21069T>A
NC_000014.8:g.23888802A>T
NM_000257.2:c.3743T>A
NM_000257.3:c.3743T>A

Protein change:

M1248K

Links:

dbSNP: rs1060501434

NCBI 1000 Genomes Browser:

rs1060501434

Molecular consequence:

NM_000257.4:c.3743T>A - missense variant - [Sequence Ontology: SO:0001583]

Condition(s)

Name:: Hypertrophic cardiomyopathy
Synonyms:: HYPERTROPHIC MYOCARDIOPATHY
Identifiers:: MONDO: MONDO:0005045; MeSH: D002312; MedGen: C0007194; Human Phenotype Ontology: HP:0001639

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Submission Accession	Submitter	Review Status (Assertion method)	Clinical Significance (Last evaluated)	Origin	Method	Citations
SCV000546191	Labcorp Genetics (formerly Invitae), Labcorp	criteria provided, single submitter (Invitae Variant Classification Sherloc (09022015))	Uncertain significance (Jan 29, 2024)	germline	clinical testing	PubMed (2) [See all records that cite these PMIDs] 32815737, 28492532

Submission Accession

Submitter

Review Status
(Assertion method)

Clinical Significance
(Last evaluated)

Origin

Method

Citations

SCV000546191

Labcorp Genetics (formerly Invitae), Labcorp

criteria provided, single submitter

(Invitae Variant Classification Sherloc (09022015))

Uncertain significance
(Jan 29, 2024)

germline

clinical testing

PubMed (2)
[See all records that cite these PMIDs]

Help

Summary from all submissions

Ethnicity	Origin	Affected	Individuals	Families	Chromosomes tested	Number Tested	Family history	Method
not provided	germline	unknown	not provided	not provided	not provided	not provided	not provided	clinical testing

Citations

PubMed

Genetic Studies of Hypertrophic Cardiomyopathy in Singaporeans Identify Variants in TNNI3 and TNNT2 That Are Common in Chinese Patients.

Pua CJ, Tham N, Chin CWL, Walsh R, Khor CC, Toepfer CN, Repetti GG, Garfinkel AC, Ewoldt JF, Cloonan P, Chen CS, Lim SQ, Cai J, Loo LY, Kong SC, Chiang CWK, Whiffin N, de Marvao A, Lio PM, Hii AA, Yang CX, Le TT, et al.

Circ Genom Precis Med. 2020 Oct;13(5):424-434. doi: 10.1161/CIRCGEN.119.002823. Epub 2020 Aug 20.

PubMed [citation]

PMID:: 32815737
PMCID:: PMC7676617

Sherloc: a comprehensive refinement of the ACMG-AMP variant classification criteria.

Nykamp K, Anderson M, Powers M, Garcia J, Herrera B, Ho YY, Kobayashi Y, Patil N, Thusberg J, Westbrook M; Invitae Clinical Genomics Group., Topper S.

Genet Med. 2017 Oct;19(10):1105-1117. doi: 10.1038/gim.2017.37. Epub 2017 May 11. Erratum in: Genet Med. 2020 Jan;22(1):240. doi: 10.1038/s41436-019-0624-9.

PubMed [citation]

PMID:: 28492532
PMCID:: PMC5632818

Details of each submission

From Labcorp Genetics (formerly Invitae), Labcorp, SCV000546191.6

#	Ethnicity	Individuals	Chromosomes Tested	Family History	Method	Citations
1	not provided	not provided	not provided	not provided	clinical testing	PubMed (2)

Description

This sequence change replaces methionine, which is neutral and non-polar, with lysine, which is basic and polar, at codon 1248 of the MYH7 protein (p.Met1248Lys). This variant is not present in population databases (gnomAD no frequency). This missense change has been observed in individual(s) with hypertrophic cardiomyopathy (PMID: 32815737). ClinVar contains an entry for this variant (Variation ID: 407169). 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) has been performed at Invitae for this missense variant, however the output from this modeling did not meet the statistical confidence thresholds required to predict the impact of this variant on MYH7 protein function. In summary, the available evidence is currently insufficient to determine the role of this variant in disease. Therefore, it has been classified as a Variant of Uncertain Significance.

#	Sample				Method		Observation
#	Origin	Affected	Number tested	Tissue	Purpose	Method	Individuals	Allele frequency	Families	Co-occurrences
1	germline	unknown	not provided	not provided	not provided		not provided	not provided	not provided	not provided

Last Updated: Sep 29, 2024

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