Expression of several domains of twitchin and myorod in the ontogeny of the mussel <Emphasis Type="Italic">Mytilus trossulus</Emphasis> |
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| Authors: | O S Matusovsky V A Dyachuk K V Kiselev G G Matusovskaya N S Shelud’ko |
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| Institution: | 1.Zhirmunsky Institute of Marine Biology, Far Eastern Division,Russian Academy of Sciences,Vladivostok,Russia;2.Institute of Biology and Soil Sciences, Far Eastern Division,Russian Academy of Sciences,Vladivostok,Russia |
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| Abstract: | The expression of MLCK- and PEVK-domains of twitchin, as well as the unique N-terminal domain of myorod in early development
of the mussel Mytilus trossulus has been studied. The MLCK-domain of twitchin and the unique N-terminal domain of myorod appear at the early stages of development,
whereas the PEVK-domain of twitchin is present only in muscles of adult mussel. The sizes of genes of the N-terminal domain
of myorod, obtained at the blastula stage and from the adult animal are similar, but the proteins have significant differences
in the amino acid sequences. Consequently, myorod and twitchin appear at early stages of larval mussels before the formation
of “adult” muscles capable of catch contraction, and at these stages both proteins are isoforms, which differ from the isoforms
of adult animals. It is possible that the MLCK-domain in the “larval” isoform of twitchin is necessary for regulating the
formation of the contractile apparatus of molluscan smooth muscles, while the PEVK-domain is important for the regulation
of the catch state in muscles of adult animals. |
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