大菱鲆高温胁迫应答主效QTL候选基因的表达特性分析

Expression characteristics analysis of major QTL candidate genes inresponse to high temperature stress in turbot (Scophthalmus maximus)

  • 摘要: 为研究大菱鲆高温胁迫下相关应激基因的表达影响,采用Real-time PCR对本课题组已定位到的大菱鲆高温胁迫应答主效QTL中的4个候选基因(p53、UBE2HZNF469和MAGI2基因)在不同温度胁迫下的肝脏、鳃、脾脏、皮肤4个组织中的表达量进行检测。以大菱鲆正常生活水温14 °C为对照组,20 °C、23 °C、25 °C和28 °C为实验组,进行数据分析。结果显示,4个基因在各个组织中均有表达,且表达量具有组织和温度特异性。其中UBE2H的表达量在4个组织中均呈现出先上升后下降的趋势,在肝脏、脾脏、皮肤组织中20 °C时急剧上升并达到峰值且差异显著;在鳃组织中23 °C时达峰值,差异显著。p53在4个组织中的表达量均有先上升后下降的趋势,但在鳃和皮肤组织中28 °C时表达量急剧升高达到峰值且差异显著。ZNF469和MAGI2在4个组织中均在20 °C时大量表达,并远高于其他温度。研究表明,在大菱鲆高温胁迫应答过程中p53基因与DNA修复和细胞凋亡密切相关,而UBE2H基因参与的泛素-蛋白酶体途径对p53基因具有反馈调节作用,是维持细胞稳态的关键基因;ZNF469和MAGI2在作为鱼类应答高温胁迫的生物标志物方面具有重要研究价值。

     

    Abstract: Turbot (Scophthalmus maximus) is an important economic species extensively cultured in China. In this study, we exerted acute high temperature stress on turbot to identify the expression characteristics of four candidate genes including UBE2H, p53, ZNF469, and MAGI2 genes in the liver, gill, spleen and skin. These genes are derived from the QTL related to high temperature resistance located at high-density genetic linkage maps. The relative expressions of UBE2H, p53, ZNF469, and MAGI2 mRNA in four experimental groups (temperature 20 °C, 23 °C, 25 °C and 28 °C)and one control group (temperature 14 °C) were tested using real-time quantitative PCR. Data analysis demonstrated that the four genes were expressed in all tissues, and the expression levels were tissue and temperature specific. The relative expression of UBE2H mRNA firstly increased and then decreased in four tissues. The expression levels in the liver, spleen, and skin tissues increased rapidly at 20 °C and reached a peak value, and peaked at 23 °C in gill tissue. The expression of P53 mRNA increased first and then decreased in four tissues. However, the expression of p53 increased sharply at 28 °C and peaked significantly. It was speculated that the tissue was severely damaged and the cells are heavily apoptotic. ZNF469 and MAGI2 were abundantly expressed at 20 °C in four tissues, than other temperatures. Therefore, we think that both can serve as biomarkers for response to high temperature stress in turbot.

     

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