特定物种的SP110替代拼接驱动了牛的结核病易感性
Ajiao Fan1,2,3,4, Ying Guo2,3, Zhunan Li2,3
1Hainan Institute of Northwest A&F University, Sanya, 572025, Hainan, China.
Veterinary research
|December 11, 2025
概括
乳牛对牛结核病 (bTB) 的敏感性与牛SP110 (bSP110) 基因有关. 替代拼接产生一个bSP110c变体,降低对Mycobacterium bovis的抵抗力.
科学领域:
- 兽医免疫学 兽医免疫学
- 分子遗传学 分子遗传学
- 动物育种 动物育种
背景情况:
- 由Mycobacterium bovis (M. bovis) 引起的牛结核病 (bTB) 是一种影响乳牛的重大动物性疾病.
- SP110基因与宿主对结核病的易感性有关,但其在乳牛bTB易感性中的作用仍然未被描述.
研究的目的:
- 调查牛SP110 (bSP110) 基因与乳牛对M. bovis感染的敏感性之间的相关性.
- 阐明与bSP110基因相关的乳牛中bTB易感性的分子机制.
主要方法:
- 在乳牛中分析牛SP110 (bSP110) 基因的替代拼接模式.
- 不同的bSP110拼接变体 (bSP110a,bSP110b,bSP110c) 的抗bTB功能的比较.
- 调查在bSP110替代拼接中一个反动物特异性的前SAND外子序列的作用.
主要成果:
- 乳牛对bTB的敏感性增加与bSP110基因的特定物种替代拼接有关.
- 一个截断的bSP110c变体,缺乏对抗bTB功能至关重要的SAND域,主要表达.
- 与bSP110a和bSP110b变种相比,bSP110c变种对M. bovis的耐药性显著降低.
- 类动物特异性缺失前SAND外基因促进bSP110c的产生,而人类/马类序列抑制bSP110c并增强bSP110a/b的表达.
结论:
- 对bSP110基因的特定物种替代拼接导致bSP110c变体表达增加,导致奶牛对bTB的易感性.
- 前SAND外子区域是bSP110替代拼接和抗bTB功能的关键决定因素.
- bSP110基因是基因编辑策略的潜在目标,用于培养抗结核的乳牛.
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