835-生态演化：绿弯菌门的跨生境扩张与基因组精简化

这项研究探讨了Chloroflexota门下名为Limnocylindria的细菌谱系如何跨越生态边界，从陆地环境成功殖民至淡水系统。研究发现，该谱系中的两个姐妹科采取了截然不同的进化策略：CSP1-4通过获取特定功能的基因实现了基因组扩张，而Limnocylindraceae则经历了显著的基因组缩减和代谢简化。在Limnocylindraceae中，关键DNA糖苷酶的缺失导致其处于高变异状态，这种突变压力而非自然选择驱动了其基因组的缩小和GC含量的下降。与此同时，尽管基因组整体趋于简约，该谱系在蛋白质水平上表现出对碳和氮利用效率的选择性优化。总之，这些发现揭示了适应性精简与非适应性突变动力学共同作用，推动了自由生活细菌的生态位专业化与跨生态系统转变。References: Serra Moncadas L, Shakurova A, Hofer C, et al. Deep-branching Chloroflexota lineages illuminate the eco-evolutionary foundation of cross-ecosystem colonization[J]. Nature Communications, 2026.前往小宇宙评论区与主播互动

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835-生态演化：绿弯菌门的跨生境扩张与基因组精简化

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