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NM_000257.4(MYH7):c.764C>A (p.Thr255Lys) AND Hypertrophic cardiomyopathy

Germline classification:
Uncertain significance (1 submission)
Last evaluated:
Jan 26, 2019
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:
RCV001053505.8

Allele description [Variation Report for NM_000257.4(MYH7):c.764C>A (p.Thr255Lys)]

NM_000257.4(MYH7):c.764C>A (p.Thr255Lys)

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.764C>A (p.Thr255Lys)
HGVS:
  • NC_000014.9:g.23431450G>T
  • NG_007884.1:g.9212C>A
  • NM_000257.4:c.764C>AMANE SELECT
  • NP_000248.2:p.Thr255Lys
  • LRG_384:g.9212C>A
  • NC_000014.8:g.23900659G>T
  • NM_000257.3:c.764C>A
Protein change:
T255K
Links:
dbSNP: rs1892933875
NCBI 1000 Genomes Browser:
rs1892933875
Molecular consequence:
  • NM_000257.4:c.764C>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

Assertion and evidence details

Help
Submission AccessionSubmitterReview Status
(Assertion method)		Clinical Significance
(Last evaluated)		OriginMethodCitations
SCV001217771Labcorp Genetics (formerly Invitae), Labcorp
criteria provided, single submitter

(Invitae Variant Classification Sherloc (09022015))		Uncertain significance
(Jan 26, 2019) 		germlineclinical testing

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

Help

Summary from all submissions

EthnicityOriginAffectedIndividualsFamiliesChromosomes testedNumber TestedFamily historyMethod
not providedgermlineunknownnot providednot providednot providednot providednot providedclinical testing

Citations

PubMed

Reassessment of Mendelian gene pathogenicity using 7,855 cardiomyopathy cases and 60,706 reference samples.

Walsh R, Thomson KL, Ware JS, Funke BH, Woodley J, McGuire KJ, Mazzarotto F, Blair E, Seller A, Taylor JC, Minikel EV, Exome Aggregation Consortium, MacArthur DG, Farrall M, Cook SA, Watkins H.

Genet Med. 2017 Feb;19(2):192-203. doi: 10.1038/gim.2016.90. Epub 2016 Aug 17.

PubMed [citation]
PMID:
27532257
PMCID:
PMC5116235

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, SCV001217771.5

#EthnicityIndividualsChromosomes TestedFamily HistoryMethodCitations
1not providednot providednot providednot providedclinical testing PubMed (2)

Description

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. This variant is found within a region of MYH7 between codons 181 and 937 that contains the majority of the myosin head domain. Missense variants in this region have been shown to be significantly overrepresented in individuals with hypertrophic cardiomyopathy (PMID: 27532257). Algorithms developed to predict the effect of missense changes on protein structure and function (SIFT, PolyPhen-2, Align-GVGD) all suggest that this variant is likely to be tolerated, but these predictions have not been confirmed by published functional studies and their clinical significance is uncertain. This variant has not been reported in the literature in individuals with MYH7-related conditions. This variant is not present in population databases (ExAC no frequency). This sequence change replaces threonine with lysine at codon 255 of the MYH7 protein (p.Thr255Lys). The threonine residue is highly conserved and there is a moderate physicochemical difference between threonine and lysine.

#SampleMethodObservation
OriginAffectedNumber testedTissuePurposeMethodIndividualsAllele frequencyFamiliesCo-occurrences
1germlineunknownnot providednot providednot providednot providednot providednot providednot provided

Last Updated: Sep 29, 2024