在尼罗河鱼 (Oreochromis niloticus) 中发现了两种IgM子类,这为远鱼IgM进化提供了洞察力
Yuan-Yuan Yao1, Chen-Xi Pan2, Yu-Dong Hao2
1Natioanl Key Laboratory of Agricultural Microbiology, Hubei Hongshan Laboratory, Engineering Research Center of Green Development for Conventional Aquatic Biological Industry in the Yangtze River Economic Belt, Ministry of Education, College of Fisheries, Huazhong Agricultural University, Wuhan, China; Institute of Hydrobiology, Chinese Academy of Sciences, Wuhan, China.
Fish & shellfish immunology
|August 3, 2025
概括
鱼有两个不同的免疫球蛋白M (IgM) 亚类,具有独特的重链基因,Ighμ1和Ighμ2. 这些基因在细菌和病毒免疫反应中表现不同,突出显示了鱼类的IgM复杂性.
科学领域:
- 免疫学 免疫学 免疫学
- 鱼类生物学 鱼类生物学
- 分子生物学分子生物学
背景情况:
- 免疫球蛋白M (IgM) 是一种在鱼类免疫力中至关重要的古老抗体.
- 了解IgM多样性是远距离鱼类免疫系统研究的关键.
研究的目的:
- 研究尼罗河鱼 (Oreochromis niloticus) 中多个IgM重链基因的存在和特征.
- 分析这些IgM基因的基因组,转录和蛋白质表达模式.
- 了解IgM子类在免疫反应中的不同作用.
主要方法:
- 克隆和测序两个尼罗河鱼IgM重链基因 (Ighμ1和Ighμ2).
- 氨基酸身份和保存残留物的生物信息分析.
- 质谱测量用于蛋白质检测.
- 在各种组织和刺激后进行基因表达分析的定量PCR.
- 用于单个B细胞分析的流细胞计.
主要成果:
- 在尼罗河鱼中发现了两个相邻的IgM重链基因Ighμ1和Ighμ2,它们在常数区域中具有82.58%的氨基酸同一性.
- 发现了对Ig结构至关重要的保存的氨酸和氨酸残留物.
- 这两种基因都在系统和粘膜组织中构成性表达,并在单个IgM+B细胞中共同表达.
- 在与Poly I:C,Aeromonas hydrophila或Streptococcus agalactiae进行刺激时,Ighμ1和Ighμ2表现出不同的表达特征,这表明它们具有特殊的作用.
结论:
- 尼罗河鱼具有两种IgM子类,它们的重链基因有所区别.
- 这些IgM子类在应对各种免疫刺激时表现出不同的表达模式.
- 这些发现揭示了鱼IgM系统的复杂性,并有助于理解鱼类IgM进化.
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