Welcome to Chinese Agricultural Science Bulletin,

Chinese Agricultural Science Bulletin ›› 2021, Vol. 37 ›› Issue (9): 95-102.doi: 10.11924/j.issn.1000-6850.casb2020-0268

Special Issue: 生物技术

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Sn-hsc70 Gene in Sipunculus nudus: Cloning and Expression Analysis

Huang Jianqiang1(), Wei Wenlu1, Zhong Ruzhuo1, Zhang Jiawei1, Yang Chuangye1,2(), Wang Qingheng1,2   

  1. 1Fisheries College Guangdong Ocean University, Zhanjiang Guangdong 524088
    2Guangdong Provincial Engineering Laboratory for Mariculture Organism Breeding, Zhanjiang Guangdong 524088
  • Received:2020-07-20 Revised:2020-09-28 Online:2021-03-25 Published:2021-04-09
  • Contact: Yang Chuangye E-mail:1204987259@qq.com;yangcy@gdou.edu.cn

Abstract:

The purpose is to explore the role of heat shock protein 70 (Hsc70) from Sipunculus nudus in the process of oogenesis, and to accumulate basic data for understanding the molecular mechanism of S. nudus oocyte development. With S. nudus as the samples, the full-length cDNA of Sn-hsc70 gene was obtained with the method of RACE technology. According to the bioinformatics analysis, Sn-hsc70 held the full-length of 2508 bp and encoded 656 amino acids; Sn-Hsc70 protein was a hydrophilic protein with molecular weight of 71.65 kDa. The conserved sequence, nuclear localization sequence, cytoplasmic localization sequence, continuous repeating tetrapeptide sequence, advanced structure, phylogenetic tree and domain of the protein were also analyzed. RT-PCR results showed that the expression level of Sn-hsc70 was significantly different in various stages of oocyte development (P <0.05) and showed a single peak. During the development of coelomic fluid (O1-O4), the expression of Sn-hsc70 increased rapidly, especially in the vigorous synthesis stage and mature stage of yolk (O3-O4). The expression of Sn-hsc70 was significantly down-regulated after leaving the coelomic fluid (O5-O6). The study indicates that Sn-hsc70 might play an important role in the accumulation of yolk, which is related to the weakening of oocyte transcription and protein synthesis.

Key words: Sipunculus nudus, heat shock response, heat shock protein 70, gene cloning, expression analysis, oocytes

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