title: Comparative analysis of sequence feature and expression of two heat shock cognate 70 genes in mandarin fish Siniperca chuatsi.
abstract: Heat shock cognate protein 70 (HSC70) is a molecular chaperone that plays essential roles in maintaining the cellular protein homeostasis. In this study, two HSC70 isoforms were identified and characterized from mandarin fish Siniperca chuatsi. They have similar sequence structures, containing seven introns in their coding regions and sharing 94% similarity of their deduced amino acid sequences with 38 substitutions. Transcripts of both isoforms were detected throughout the embryogenesis, at low levels during the early developmental stages and up-regulated at blastula for ScHSC70-1 and appearance of myomere stage for ScHSC70-2. They were ubiquitously expressed in tissues under normal conditions, whereas with tissue-specific variation. Following acute heat shock at 34°C, the expression of ScHSC70-1 showed no significant changes in the liver, and just a modest increase in the heart and head kidney, while the ScHSC70-2 mRNA levels were markedly up-regulated in these tissues. Compared with their expression under gradual heat shock, the ScHSC70-2 mRNA was rising at a higher rate under fast heat shock, whereas the ScHSC70-1 mRNA increasing rate was lower under fast heat shock. Under hypoxia, transcripts of ScHSC70-1 were not significantly changed, while the expression of ScHSC70-2 was suppressed. Aeromonas hydrophila infection significantly increased the ScHSC70-1 mRNA levels in the head kidney and spleen on early infective stages, while failed to have any significant impact on the expression of ScHSC70-2 in both immune tissues. These results suggest that ScHSC70-1 and ScHSC70-2 are differently involved in the embryogenesis and the stress responses of high temperature, hypoxia and bacterial infection. This study will contribute to further study on enhancing stress tolerance and disease resistance of mandarin fish.
authors: Institute of Aquatic Economic Animals and Guangdong Province Key Laboratory for Aquatic Economic Animals, School of Life Sciences, Sun Yat-sen University, Guangzhou 510006, China; South China Sea Fisheries Research Institute, Chinese Academy of Fishery Science, Guangzhou 510300, China.
authors: Pengfei
authors: P
authors: Wang
authors: Institute of Aquatic Economic Animals and Guangdong Province Key Laboratory for Aquatic Economic Animals, School of Life Sciences, Sun Yat-sen University, Guangzhou 510006, China.
authors: Peng
authors: P
authors: Xu
authors: Institute of Aquatic Economic Animals and Guangdong Province Key Laboratory for Aquatic Economic Animals, School of Life Sciences, Sun Yat-sen University, Guangzhou 510006, China.
authors: Shuang
authors: S
authors: Zeng
authors: Institute of Aquatic Economic Animals and Guangdong Province Key Laboratory for Aquatic Economic Animals, School of Life Sciences, Sun Yat-sen University, Guangzhou 510006, China.
authors: Lei
authors: L
authors: Zhou
authors: Institute of Aquatic Economic Animals and Guangdong Province Key Laboratory for Aquatic Economic Animals, School of Life Sciences, Sun Yat-sen University, Guangzhou 510006, China.
authors: Lei
authors: L
authors: Zeng
authors: Institute of Aquatic Economic Animals and Guangdong Province Key Laboratory for Aquatic Economic Animals, School of Life Sciences, Sun Yat-sen University, Guangzhou 510006, China. Electronic address: liguif@mail.sysu.edu.cn.
authors: Guifeng
authors: G
authors: Li
mesh_terms: D016980:Aeromonas hydrophila / Q000502:physiology; D000595:Amino Acid Sequence; D000818:Animals; D015687:Cell Hypoxia; D004625:Embryo, Nonmammalian / Q000378:metabolism; D005260:Female; D005393:Fish Diseases / Q000378:metabolism* / Q000382:microbiology; D029941:Fish Proteins / Q000737:chemistry / Q000235:genetics / Q000378:metabolism*; D015870:Gene Expression; D016905:Gram-Negative Bacterial Infections / Q000378:metabolism / Q000382:microbiology / Q000662:veterinary*; D050883:HSC70 Heat-Shock Proteins / Q000737:chemistry / Q000235:genetics / Q000378:metabolism*; D008969:Molecular Sequence Data; D009928:Organ Specificity; D010473:Perciformes / Q000235:genetics / Q000378:metabolism*; D010802:Phylogeny; D017386:Sequence Homology, Amino Acid; D015533:Transcriptional Activation
chemical_list: D029941:Fish Proteins; D050883:HSC70 Heat-Shock Proteins
keywords: Aeromonas hydrophila; HSC70; Heat shock; Hypoxia; Siniperca chuatsi