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Molecular characteristics of the HSP70 gene and its differential expression in female and male golden apple snails (Pomacea canaliculata) under temperature stimulation

文献类型： 外文期刊

作者： Song, Hong-Mei 1 ; Mu, Xi-Dong 1 ; Gu, Dang-En 1 ; Luo, Du 1 ; Yang, Ye-Xin 1 ; Xu, Meng 1 ; Luo, Jian-Ren 2 ; Zhang, Jia 1 ;

作者机构： 1.Chinese Acad Fishery Sci, Pearl River Fisheries Res Inst, Key Lab Trop & Subtrop Fishery Resource Applicat, Minist Agr, Guangzhou 510380, Guangdong, Peoples R China

2.Chinese Acad Fishery Sci, Pe

关键词： Gene expression;HSP70;Pomacea canaliculata;Temperature stress

期刊名称：CELL STRESS & CHAPERONES （ 影响因子：3.667； 五年影响因子：3.717 ）

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收录情况： SCI

摘要： Heat-shock protein 70 (HSP70) is one of the most important heat-shock proteins that helps organisms to modulate stress response via over-expression. The HSP70 gene from Pomacea canaliculata was cloned using the RACE approach; the gene is 2,767 bp in length and contains an open reading frame of 1,932 bp, which is encoded by a polypeptide of 643 amino acids. BLAST analysis showed that the predicted amino acid sequence of the P. canaliculata HSP70 gene shared a relatively high similarity with that of other known eukaryotic species that display conserved HSP characteristics. The phylogeny demonstrated a separate clustering of the apple snail HSP70 with other constitutive members from other mollusk species. Quantitative real-time RT-PCR was used to detect the differential expression of HSP70 in both sexes of P. canaliculata at different temperature conditions. These results showed that HSP70 transcript levels decreased slightly under cold shock and increased significantly under heat-shock conditions in both sexes compared to normal temperatures (26°C). Under cold-shock treatment, the sex effect was not significant. With heat treatment, HSP70 expression could be induced at 36°C in both females and males, and it peaked at 42 and 39°C in females and males, respectively. In addition, a clear time-dependent HSP70 expression pattern of the apple snail exposed to the same high temperature (36°C) was observed at different time points. The maximal induction of HSP70 expression appeared at 12 and 48 h in males and females after heat shock, respectively. The maximal induction in females was significantly higher compared to males under heat stimulus. Taken together, these results strongly suggested that males were more susceptible to heat than females and provided useful molecular information for the ecological adaptability of P. canaliculata against extreme environmental stress.

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