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相关概念视频

The Tree of Life - Bacteria, Archaea, and Eukaryotes02:40

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The “tree of life” describes the evolution of life and the evolutionary relationships between organisms. The root of the tree is the common ancestor to all life on Earth. All other species radiate from this point, much like the branches of a tree. The numerous tips of these branches on the tree of life represent every living, or extant, species. Extinct species, which are species that no longer exist, can be found towards the center of the tree. Currently, these organisms, both...
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Prokaryotic Cells01:51

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Prokaryotes are small unicellular organisms that include the domains—Archaea and Bacteria. Bacteria include many common organisms, such as Salmonella and E. coli, while the Archaea include extremophiles that live in harsh environments, such as volcanic springs.
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The genome of most prokaryotic organisms consists of double-stranded DNA organized into one circular chromosome in a region of cytoplasm called the nucleoid. The chromosome is tightly wound, or supercoiled, for efficient storage. Prokaryotes also contain other circular pieces of DNA called plasmids. These plasmids are smaller than the chromosome and often carry genes that confer adaptive functions, such as antibiotic resistance.
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While every living organism has a genome of some kind (be it RNA, or DNA), there is considerable variation in the sizes of these blueprints. One major factor that impacts genome size is whether the organism is prokaryotic or eukaryotic. In prokaryotes, the genome contains little to no non-coding sequence, such that genes are tightly clustered in groups or operons sequentially along the chromosome. Conversely, the genes in eukaryotes are punctuated by long stretches of non-coding sequence.
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地细菌:重新定义细菌包膜的多样性,生物发生和进化.

Basile Beaud Benyahia1, Najwa Taib1,2, Christophe Beloin3

  • 1Evolutionary Biology of the Microbial Cell Laboratory, Institut Pasteur, Université Paris Cité, Paris, France.

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细菌外从双膜结构进化,外膜 (OM) 多次丢失,特别是在Terrabacteria类中. 这挑战了传统的格拉姆阳性/格拉姆阴性分类.

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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
  • 细胞生物学 细胞生物学

背景情况:

  • 对于细胞生存至关重要的细菌外,传统上被分为格兰阳性 (单体) 和格兰阴性 (双体) 类型.
  • 最近的研究表明,最后一个细菌共同祖先拥有双皮膜,单皮细胞由外膜 (OM) 损失引起.

研究的目的:

  • 审查当前关于Terrabacteria类的知识,重点关注它们的细胞包膜多样性.
  • 探索从古典细菌包膜模型和OM生物发生的洞察的偏差.
  • 讨论细菌包裹的演变,包括OM损失和出现.

主要方法:

  • 审查现有的文献和关于细菌菌株和细胞外结构的里程碑式研究.
  • 在Terrabacteria中对OM生物发生系统的比较分析与经典模型.
  • 遗传学分析,以了解细菌包裹类型的进化轨迹.

主要成果:

  • 地细菌在细胞外中表现出显著的表型多样性,挑战了经典的格拉姆阳性/格拉姆阴性二分法.
  • 在Terrabacteria中OM生物发生的独特系统为包裹多样性提供了新的视角.
  • 证据表明,在Terrabacteria类中,OM的多个独立损失.

结论:

  • 陆地细菌分类表现出显著的细胞外变异性,需要重新评估传统的细菌分类.
  • 了解Terrabacteria的OM生物生成为细菌包裹的进化和多样性提供了关键的见解.
  • 细菌包裹的进化历史可能涉及OM在最后一个细菌共同祖先之前的出现以及随后的多次损失.