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在古代植物的共生中,融合的极端减小进化.

Anna Michalik1, Diego C Franco2,3, Junchen Deng3,4

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植物,Sulcia和Vidania中的内共生细菌,由于宿主变化,进化了非常小的基因组,有些只有50kb. 这种极端的减少模糊了细菌和有机体之间的界限.

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科学领域:

  • 微生物学 微生物学
  • 进化生物学 进化生物学
  • 基因组学就是基因组学.

背景情况:

  • 可遗传的内共生细菌为吸水昆虫提供必要的营养.
  • 这些细菌通常具有高度减少和保存的基因组.
  • 数百万年来与宿主共同进化形成了细菌基因组的缩小.

研究的目的:

  • 调查植物内共生体Sulcia和Vidania的基因组变化.
  • 了解共感染和宿主生态转变对基因组减少的影响.
  • 描述已知最小的细菌基因组及其对共生体进化的影响.

主要方法:

  • 苏尔西亚和维达尼亚内共生体的比较基因组学.
  • 细菌基因组大小和基因含量的分析.
  • 遗传学分析来追踪进化的历史.
  • 研究影响基因组演变的环境和共感染因素.

主要成果:

  • 在Vidania endosymbionts.中确定了极度缩小的细菌基因组 (50-52kb).
  • 观察了不同植物种谱系中微小基因组的融合进化.
  • 在融合基因组中突出显示了基因含量的相似性,包括氨酸生物合成.
  • 证明宿主生态切换和共感染加速了基因组的减少.

结论:

  • 内生生物基因组的减少受到宿主因素的影响,而不仅仅是简单的共同多样化.
  • 极端的基因组缩小接近器官的依赖水平.
  • 细菌-有机体的界限进一步模糊,因为在共生体中极端的基因组精简.