MYH7

From Wikipedia, the free encyclopedia

Myosin, heavy chain 7, cardiac muscle, beta

PDB rendering based on 2fxm.

Available structures: 2fxm, 2fxo

Identifiers

Symbol(s)

MYH7; CMD1S; CMH1; MGC138376; MGC138378; MPD1; MYHCB

External IDs

OMIM: 160760 MGI: 2155600 HomoloGene: 68044

Gene ontology
Molecular Function:	• microfilament motor activity • nucleotide binding • actin binding • calmodulin binding • ATP binding • structural constituent of muscle • ATPase activity • actin-dependent ATPase activity
Cellular Component:	• muscle myosin complex • striated muscle thick filament • myosin complex
Biological Process:	• cardiac chronotropy • striated muscle contraction • adult heart development • muscle filament sliding • ventricular cardiac muscle morphogenesis

RNA expression pattern

More reference expression data

Orthologs

Human

Mouse

n/a

n/a

Refseq

NM_000257 (mRNA)
NP_000248 (protein)

NM_080728 (mRNA)
NP_542766 (protein)

Location

Chr 14: 22.95 - 22.97 Mb

n/a

Pubmed search

[1]

[2]

MYH7 is a gene encoding a myosin heavy chain beta (MHC-β) isoform (slow twitch) expressed primarily in the heart.

Changes in the relative abundance of MHC-β and MHC-α (MYH6, the fast isoform of cardiac myosin heavy chain) correlate with the contractile velocity of cardiac muscle.^[1] In early fetal development, MHC-β is predominately expressed in the ventricles, while MHC-α is predominantly expressed in the atria. In healthy adult hearts, MHC-α is predominantly expressed in the atria (>90%), while MHC-β (~50%) is expressed in the atria of failing adult hearts. In vitro studies have demonstrated that newly formed cardiac myocytes express MHC-β, and after prolonged (1-5 weeks) contractile activity MHC-α becomes detectable. An allelic variant of this gene is associated with approximately 40% of the cases of Hypertrophic cardiomyopathy (HCM). This condition is an autosomal-dominant disease, in which a single copy of the variant gene causes enlargement of the left ventricle of the heart. Disease onset usually occurs later in life, perhaps triggered by changes in thyroid hormone function and/or physical stress.

[edit] References

^ Entrez Gene: MYH7 myosin, heavy chain 7, cardiac muscle, beta.

[edit] Further reading

Jääskeläinen P, Miettinen R, Kärkkäinen P, et al. (2004). "Genetics of hypertrophic cardiomyopathy in eastern Finland: few founder mutations with benign or intermediary phenotypes.". Ann. Med. 36 (1): 23–32. PMID 15000344.
Kamisago M, Schmitt JP, McNamara D, et al. (2007). "Sarcomere protein gene mutations and inherited heart disease: a beta-cardiac myosin heavy chain mutation causing endocardial fibroelastosis and heart failure.". Novartis Found. Symp. 274: 176–89; discussion 189–95, 272–6. PMID 17019812.