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Proceedings of the National Academy of Sciences of the United States of America logoLink to Proceedings of the National Academy of Sciences of the United States of America
. 1982 Sep;79(17):5230–5234. doi: 10.1073/pnas.79.17.5230

Sarcomeric myosin heavy chain is coded by a highly conserved multigene family.

H T Nguyen, R M Gubits, R M Wydro, B Nadal-Ginard
PMCID: PMC346869  PMID: 6291033

Abstract

pMHC25, a recombinant plasmid containing myosin heavy chain (MHC) cDNA sequences from differentiated myotubes of the L6E9 rat cell line, has been shown to hybridize to all sarcomeric MHC mRNAs so far tested but not to nonsarcomeric MHC mRNAs. In addition, pMHC25 hybridizes to multiple restriction endonuclease-digested fragments of rat genomic DNA corresponding to different MHC genomic sequences. Thus, the MHC gene represented by pMHC25 is a member of a sarcomeric MHC multigene family that has regions of sequence homology shared among its members. This sarcomeric MHC multigene family has been estimated to be composed of a minimum of seven genes, some of which are polymorphic in the rat. We have also determined that pMHC25 hybridizes to MHC gene sequences in genomic DNA of all species that have striated muscle, ranging from nematodes to man. Sarcomeric MHC genes, therefore, have been horizontally and vertically conserved in evolution. Additionally, we have used the pMHC25 plasmid to demonstrate that MHC genes do not undergo rearrangement or amplification during muscle cell differentiation.

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Selected References

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