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Vitellogenin gene expression and hemolymph vitellogenin during vitellogenesis, final maturation, and oviposition in female kuruma prawn, Marsupenaeus japonicus
Changes in egg yolk protein gene activity and blood levels during egg development and laying in female kuruma prawns
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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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