萨克西托克辛生物合成基因在海洋恐龙亚历山大体中的多细胞起源通过比较转录组学揭示了
Quynh Thi Nhu Bui1, Han-Sol Kim1, Jang-Seu Ki1
1Department of Life Science, Sangmyung University, Seoul 03016, South Korea.
Harmful algae
|May 5, 2024
概括
有毒的亚历山大恐龙可能通过从蓝藻细菌的水平基因转移获得saxitoxin (STX) 基因. 非有毒物种已经失去了关键的STX生物合成基因,影响了毒素的产生.
科学领域:
- 海洋生物学 海洋生物学
- 基因组学就是基因组学.
- 微生物生态学 微生物生态学
背景情况:
- 海洋恐龙,特别是亚历山大物种,以引起有害的藻类繁殖而闻名.
- 亚历山大中的撒西托克辛 (STX) 生产与特定的生物合成基因 (sxt) 有关,但它们的进化起源仍在争论中.
研究的目的:
- 在有毒和无毒的亚历山大物种中研究STX生物合成基因的进化史.
- 了解恐龙鞭状动物中萨克西毒素生产和损失的遗传基础.
主要方法:
- 毒性 (A. catenella,A. pacificum) 和无毒性 (A. fraterculus,A. fragae) 的亚历山大物种的转录组测序.
- 对sxt基因同质性,表达水平和家族遗传关系的比较分析.
- 检查使用28S rDNA作为参考的进化模式.
主要成果:
- 有毒的亚历山德里亚物种在sxt基因中表现出较高的同质性,与非有毒的相比.
- 非有毒的亚历山大已经失去了关键的sxtA4和sxtG基因.
- 遗传学分析表明,从蓝藻细菌和其他来源的sxt基因的独立水平基因转移到亚历山大.
结论:
- 失去特定的sxt基因解释了亚历山大物种之间的萨克西托克素生产差异.
- 横向基因转移是一个重要的机制,塑造了恐龙虫中STX生物合成的进化.
- 亚历山大体表现为sxt基因的单体基因转录.
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