大口黑鲈糖稳态基因的克隆、分子特征及其营养调控的分析
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雷彩霞(1990-),女,助理研究员,研究方向为水生动物种质资源及遗传育种.E-mail:leicaixia0703@sina.com

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S917

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2022 年省级乡村振兴战略专项资金种业振兴项目资金(2022-SPY-00-003); 广东省基础与应用基础研究基金项目(2023A1515010215); 中国水产科学研究院中央级公益性科研院所基本科研业务费专项资金(2022SJ-XK4); 广州市科技计划项目(2023A04J0092).


Molecular cloning, characterization, and nutritional regulation of glucose homeostasis genes in largemouth bass (Micropterus salmoides)
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    摘要:

    为进一步研究大口黑鲈(Micropterus salmoides)糖稳态调控特性, 本研究克隆了糖稳态调控基因 gp1gp2pepck1pepck2hkpfkg6p, 分别编码 878、842、635、624、918、780 和 338 个氨基酸序列, 并进行了进化树、空间分布和禁食对其基因表达影响的分析。多序列比对和进化树分析显示, 这些基因与其他脊椎动物的同源序列具有较高相似性。组织表达分析结果显示这些基因主要集中分布于肝脏和肌肉, 但呈现出组织表达差异性。 其中, gp1 在肌肉表达量最高, 肝脏次之, 在脾脏表达量最低。gp2 在肌肉中的 mRNA 水平也最高, 在心脏、肝脏表达也较为丰富。pepck1 主要分布在肝脏和肠, 在脑、脾脏、肾脏和脂肪中分布较少。pepck2 在肝脏和脑中高表达, 而在脾脏和鳃中表达量最低。对于 hk, 其在肝脏、肌肉和心脏的 mRNA 水平显著高于其余组织。肝脏中 g6p 的表达也显著高于其余组织。除此之外, 其在肌肉、肠和脂肪中分布也较为丰富。pfk 的 mRNA 水平在肝脏和心脏最高, 其次是肠和鳃。对实验大口黑鲈禁食后发现, 肝脏 gp2pepck2g6p 的表达从禁食第 6 小时开始上调并持续到 24 h。而 gp1hkpfK 的表达则随禁食延长先上升后下降, 并在第 6 小时时达到峰值。然而, 肝脏 pepck1 基因在整个禁食阶段均趋于稳定。肌肉组织中, gp1 的转录随禁食延长而持续增强, 至 24 h 达到最高值。gp2g6p 表达均在禁食第 12 小时出现明显升高, 并在 24 h 达到峰值。pepck1 在禁食第 0 小时的 mRNA 水平最低, 在 12 和 24 h 时最高。禁食第 24 小时 pepck2 的表达显著最高。hkpfk 则随禁食延长呈现先升后降的模式, 其最高和最低值分别出现在禁食第 6 和第 0 小时。综上, 本研究获得了糖稳态调控关键基因的完整编码序列, 并研究了其在应对饥饿状态时的不同分子应答, 研究结果将为后期进一步研究大口黑鲈糖稳态调控提供重要基础资料。

    Abstract:

    To investigate the regulation of glucose homeostasis in Micropterus salmoides, we cloned genes gp1, gp2, pepck1, pepck2, hk, pfk, and g6p encoding 878, 842, 635, 624, 918, 780, and 338 amino acid residues. We also examined the phylogenetic tree, tissue distribution, and effect of fasting on the expression of these genes. Results from multiple protein sequence alignments and phylogenetic analysis showed that these genes shared high levels of identity with their orthologs in other vertebrates. Tissue profiles of these genes revealed enrichment in the liver and muscle, but with unique tissue expression differences. For example, gp1 was highly expressed in the muscle, followed by the liver, and the lowest expression level was observed in the spleen. gp2 was also highly expressed in the muscle and abundant in the heart and liver. pepeck1 was mainly expressed in the liver and intestines, with the lowest mRNA levels in the brain, spleen, kidney, and adipose tissue. pepck2 was more significantly expressed in the liver and brain than in the other tissues, whereas the lowest mRNA levels were found in the spleen and gills. Additionally, hk and g6p were most abundantly expressed in the liver, and pfk in the liver and heart. The g6p gene was also the most abundantly expressed in the liver. The muscle, intestines, and adipose tissue were also enriched with an abundance of g6p. The highest expression levels of pfk were found in the liver and heart, followed by the intestines and gills. We examined the effect of fasting on the mRNA levels of these genes in Micropterus salmoides. The results showed that hepatic gp2, pepck2, and g6p mRNA levels were gradually up-regulated with increasing fasting time, peaking at 24 h after fasting. However, gp1, hk, and pfk exhibited diverse gene expression patterns, with transcription first increasing and then decreasing with the extension of fasting time, peaking at 6 h. Hepatic pepck1 was not significantly affected throughout the fasting period. In the muscle, gp1, gp2, and g6p mRNA expression increased significantly at 12 h, with pepck1 showing the lowest expression at 0 h and the highest expression at 12 and 24 h. After fasting for 24 h, pepck2 showed the highest mRNA level. Muscular hk and pfk showed a similar expression pattern with hepatic gp1, hk, and pfk, increasing and then decreasing with fasting time. Overall, these findings provide groundwork for future studies focusing on glucose homeostasis regulation in Micropterus salmoides.

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雷彩霞,宋含茹,付豪,谢玉净,李胜杰.大口黑鲈糖稳态基因的克隆、分子特征及其营养调控的分析[J].中国水产科学,2023,30(5):604-616
LEI Caixia, SONG Hanru, FU Hao, XIE Yujing, LI Shengjie. Molecular cloning, characterization, and nutritional regulation of glucose homeostasis genes in largemouth bass (Micropterus salmoides)[J]. Journal of Fishery Sciences of China,2023,30(5):604-616

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  • 收稿日期:2023-02-20
  • 最后修改日期:2023-03-31
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  • 在线发布日期: 2023-08-07
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