Summary
Actin synthesis was observed in early embryos of the chironomid midgeSmittia spec. The criteria used to identify newly synthesized actin include comigration with purified actin in two-dimensional gel electrophoresis, and peptide mapping after limited proteolysis. Actin was also identified after in vitro translation of RNA or salt washed RNP-particles isolated from newly deposited eggs. While intact RNP-particles stimulated protein synthesis only poorly, the rate of synthesis increased considerably after partial or complete removal of proteins from RNP-particles. Actin was synthesized both during advanced stages of oogenesis and during early embryogenesis. In embryos during intravitelline cleavage actin synthesis was insensitive to inhibitors of transcription (actinomycin D, α-amanitin). Actin was found everywhere along the longitudinal axis of the embryo using a procedure which allowed simultaneous sectioning of a large number of embryos.
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Jäckle, H. Actin messenger in maternal RNP particles from an insect embryo (Smittia spec., Chironomidae, Diptera). Wilhelm Roux' Archiv 188, 225–233 (1980). https://doi.org/10.1007/BF00849052
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DOI: https://doi.org/10.1007/BF00849052