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The Vitellogenin and Its Function during Oogenesis in Teleost Fishs
Zhou Yang, Hou Congcong, Zhu Junquan*
Key Laboratory of Applied Marine Biotechnology of Ministry of Education, Ningbo University, Zhejiang Province Collaborative Innovation Center of Marine Efficient and Healthy Aquaculture, Ningbo 315211, China
Abstract: Vitellogenin (Vtg)， as the precursor of yolk protein (YP)， involved in the oogenesis in oviparous animals. The structure of teleost fishes’ Vtg is the homodimer and present different subtypes. The Vtg monomer is consist of five different domains. During the oogenesis in teleost， the Vtg plays two functions. On the one hand， the Vtg is hydrolyzed into yolk protein and store in the oocyte to provide the necessary nutrition for the oocyte development. On the other hand， the yolk protein is hydrolyzed into free amino acid with the development of oocyte. These free amino acids can regulate the osmotic pressure of oocyte to ensure the hydration. In this review， we described the types and structural characteristics of teleost Vtg， summarized the recent advances on the expression， uptake， proteolysis， and the role in hydration of Vtg. We hope this review can provide the basic data for the molecular mechanism of teleost fish oogenesis.
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