The appearance of muscle proteins in the contractile apparatus of the mussel Mytilus trossulus was subjected to comparative analysis during ontogenesis. It was established, with the use of Western blot analysis and electrophoresis in polyacrylamid gel in the presence of sodium dodecylsulfate, that proteins of the contractile apparatus of mussel muscles express long before the formation of the first functionally active muscle system of the veliger larvae. Paramyosin is present in egg cells; twitchin, myorod, and actin appear at the stage of blastula (12 h after fertilization), and myosin appears at the trochophore stage (17 h after fertilization). The quantitative relation of muscle proteins was studied in actomyosin extracts of larvae obtained from different developmental stages. It was shown that the ratios actin/myosin and paramyosin/myosin at the veliger stage (96 h after fertilization) were found to be similar to those in the striated muscles of invertebrates.
Russian Journal of Marine Biology – Springer Journals
Published: Nov 14, 2005
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