Animal reproduction science

Molecular details of a hormone that stops egg yolk production in mud crabs and how its gene levels change during egg development and after nerve chemical treatment

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Abstract

A full-length Scylla olivacea vitellogenesis-inhibiting hormone (Scyol-VIH) gene consists of 378 nucleotides encoding a 126-amino acid precursor protein.

  • Scyol-VIH is a neuropeptide hormone that regulates vitellogenesis during gonad maturation in crustaceans.
  • Expression of the Scyol-VIH gene was observed in immature female Scylla olivacea within the eyestalk, brain, and ventral nerve cord.
  • Higher levels of Scyol-VIH mRNA were found in the eyestalk of immature females, decreasing with ovarian maturation.
  • Scyol-VIH expression was localized to specific regions including the eyestalk X-organ and certain brain neuronal clusters.
  • Eyestalk Scyol-VIH levels increased following dopamine injection, suggesting a possible regulatory mechanism.

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