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Myosin expression in the developing ascidian embryo.

T H Meedel1

  • 1Boston University Marine Program, Marine Biological Laboratory, WoodsHole, Massachusetts 0254,. USA.

The Journal of Experimental Zoology
|August 24, 2012
PubMed
Summary
This summary is machine-generated.

Myosin accumulation in ascidian embryos, particularly muscle myosin, increased significantly during development. Its expression appears to be independently controlled compared to acetylcholinesterase.

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Area of Science:

  • Developmental Biology
  • Molecular Biology
  • Biochemistry

Background:

  • Myosin is a crucial protein for muscle contraction.
  • Understanding myosin accumulation provides insights into muscle development.

Purpose of the Study:

  • To investigate the accumulation patterns of myosin during ascidian embryonic development.
  • To compare the developmental timing of myosin expression with that of acetylcholinesterase.

Main Methods:

  • Preparation of a myosin-enriched fraction from ascidian embryos.
  • Assessing myosin ATPase activity.
  • Resolving myosin heavy chains using polyacrylamide gel electrophoresis.
  • Investigating the effects of actinomycin D on myosin accumulation.

Main Results:

  • Myosin ATPase activity was first detected at neurulation and increased 25- to 50-fold by larval hatching.
  • Approximately two-thirds of the myosin ATPase activity was localized to the larval tail, suggesting it is primarily muscle myosin.
  • Gel analysis confirmed ATPase assay findings but was less sensitive.
  • Actinomycin D interfered with myosin ATPase accumulation only during early developmental stages.

Conclusions:

  • Myosin accumulation in ascidian embryos follows a developmental trajectory similar to muscle acetylcholinesterase.
  • Myosin expression appears to be independently regulated compared to acetylcholinesterase, with acetylcholinesterase expression initiating approximately one hour earlier.
  • These findings contribute to understanding the independent control mechanisms of muscle cell protein expression during development.