Muscle-specific regulation of tropomyosin gene expression and myofibrillogenesis differs among muscle systems examined at metamorphosis of the gastropod Haliotis rufescens.

摘要: The spatial and temporal association of muscle-specific tropomyosin gene expression, myofibril assembly degradation during metamorphosis is analyzed in the gastropod mollusc, Haliotis rufescens. Metamorphosis planktonic larva to benthic juvenile includes rearrangement atrophy specific larval muscles, biogenesis new muscle system. major – retractor reorganizes at metamorphosis, with two suites cells having different fates. ventral degenerate, while dorsal become part developing mantle musculature. Prior these changes myofibrillar structure, mRNA prevalence declines until undetectable cells, increasing markedly cells. In foot right shell muscle, levels remain relatively stable, even though content increases. a population median mesoderm destined form de novo adult (the columellar muscle), expression initiated 45 h after induction metamorphosis. Myofibrillar filamentous actin not detected about 7 days later. Given that patterns accumulation relation disassembly differ significantly among four systems examined, we suggest regulatory mechanisms, probably operating both transcriptional post-transcriptional levels, control postlarval muscles