Comparative biochemistry and physiology. Part A, Molecular & integrative physiology

Changes in egg yolk protein gene activity and blood levels during egg development and laying in female kuruma prawns

Circadian Biology Weekly Brief ↗PubMed ↗DOI ↗

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Abstract

Hemolymph vitellogenin (VTG) levels and VTG mRNA levels in the ovary and hepatopancreas were high during vitellogenesis and decreased after oviposition.

  • VTG synthesis activity appears to increase during vitellogenesis and decrease after oviposition.
  • No significant increase in ovary size during final maturation indicates low VTG synthesis activity despite high VTG mRNA levels.
  • VTG mRNA levels in the ovary and hepatopancreas are highly correlated during vitellogenesis, suggesting similar contributions to yolk accumulation.
  • VTG mRNA levels in the hepatopancreas increase more slowly at the start of vitellogenesis and decline more sharply after oviposition compared to the ovary.
  • These findings suggest different regulatory mechanisms for VTG synthesis in the ovary versus the hepatopancreas.

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