七彩神仙鱼C型凝集素家族成员CD302MBL的克隆及在病原刺激下的免疫应答

Molecular cloning and characterization in immune response of two C-type lectin genes (SaCD302 andSaMBL) from Symphysodon aequifasciatus

  • 摘要: 七彩神仙鱼 (Symphysodon aequifasciatus) 具独特的亲代抚育行为,前期研究发现2种C型凝集素在育幼亲本皮肤中高表达,但表达模式不同,预示着潜在的功能分化。为探究两者潜在免疫功能的差异性,克隆获得了七彩神仙鱼C型凝集素基因 SaCD302SaMBL,并分析了病原刺激下的免疫应答模式。结果显示,SaCD302SaMBL 的开放阅读框 (ORF) 长度分别为741和795 bp,分别编码246和264个氨基酸。SaCD302的氨基酸序列包含一个信号肽 (aa 1—29),一个CTL结构域 (aa 32—169)和一个跨膜结构域 (aa 184—206)。SaMBL的氨基酸序列包含两个低复杂度区域 (aa 32—92和 aa 104—121) 和一个典型的CTL结构域 (aa 137—263)。SaCD302SaMBL 的氨基酸序列与尼加拉瓜湖始丽鱼 (Archocentrus centrarchus) 对应氨基酸序列的同源性最高。SaCD302 在各组织中均有表达,头肾中表达量最高,其次为肝脏和鳃;SaMBL 在皮肤中高表达,在肠道、肝脏、脾脏和性腺中低表达。嗜水气单胞菌 (Aeromonas hydrophila) 感染后,SaCD302 在脾脏、头肾、肠道和皮肤中的表达量均显著上调,SaMBL 仅在头肾、肠道和皮肤中表达上调,且时序性不同,表明二者可能在七彩神仙鱼免疫防御中发挥不同作用。

     

    Abstract: Symphysodon aequifasciatus has a unique parental rearing behavior. In the previous study, two C-type lectins (CTLs) were found to be highly expressed in the skin of parent fish, but with different expression patterns. In order to investigate the difference in the potential immune functions of the specific CTLs, we cloned two CTL genes (SaCD302 and SaMBL), then simulated and analyzed their immune esponse patterns under pathological infection. The results show that the ORF region ofSaCD302 and SaMBL were 741 and 795 bp in length, encoding 246 and 264 amino acids (aa), respectively. The SaCD302 sequence contained a signal peptide (aa 1–29), a C-type lectin-like domain (CTLD) (aa 32–169) and a transmembrane domain (aa 184–206). Two low complexity regions (aa 32–92 and aa 104–121) and a CTLD (aa 137–263) were expressed in SaMBL sequence. Moreover, SaCD302 and SaMBL shared the highest similarity with that of Archocentrus centrarchus. SaCD302 was highly expressed in the head kidney, followed by the liver and gill. Compared with the intestine, liver, spleen and gonads, the skin had the higher expression of SaMBL. After Aeromonas hydrophila infection, SaCD302 expression was significantly upregulated in the spleen, head kidney, intestine and skin, whileSaMBL was only upregulated in the head kidney, intestine and skin, and these two genes were expressed in different temporal manners, indicating that they might play different roles in the immune defense of S. aequifasciatus.

     

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