基因组变异的模式揭示了野生全四动物Mimulus sookensis的单一进化起源
Makenzie R Whitener1, Hayley Mangelson2, Andrea L Sweigart1
1Department of Genetics, University of Georgia, Athens, GA 30602, United States.
概括
多倍体性,或拥有多组染色体,可以导致植物的瞬间物种化. 这项研究证实了Mimulus sookensis的单独多体的单一起源,突出了植物的快速进化.
科学领域:
- 进化生物学 进化生物学
- 基因组学就是基因组学.
- 植物科学 植物科学
背景情况:
- 多性是植物进化的重要驱动因素,经常导致快速物种化.
- 新形成的多倍体动物可以从其双倍体祖先中分离生殖,从而实现快速的血统分歧.
- 单个多体起源的频率和随后的建立仍然是一个活跃的研究领域.
研究的目的:
- 为了研究野生四类动物Mimulus sookensis的进化历史和起源.
- 使用染色体尺度参考组件来定义M. sookensis的不同亚基因组.
- 为了确定M. sookensis是否起源于单一的杂交事件或多个独立的起源.
主要方法:
- 对于Mimulus sookensis的染色体规模参考组件的生成.
- 对人口基因组变异的分析,以推断进化模式.
- 将M. sookensis亚基因组与相关的双胞胎Mimulus物种 (M. nasutus,M. decorus,M. guttatus) 的比较.
主要成果:
- 发现了一种单一起源的明确证据,即全四形M.sookensis的单一起源.
- 一个亚基因组来自自相容的双倍体Mimulus nasutus,通过器官变异被确定为母亲的祖先.
- 第二个亚基因组与Mimulus decorus和Mimulus guttatus共享变异,表明复杂的祖先.
结论:
- 蜜 (Mimulus sookensis) 是瞬间物种化的一个关键例子.
- 马氏苏肯斯 (M. sookensis) 倾向于自我施肥,这可能促进了其快速的建立和物种化.
- 这项研究提供了关于植物中多体物种化的机制和频率的关键见解.
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