基因组解析的长读测序扩大了已知的微生物多样性,跨越了陆地息地
Mantas Sereika1, Aaron James Mussig2, Chenjing Jiang1
1Center for Microbial Communities, Aalborg University, Aalborg, Denmark.
Nature microbiology
|July 24, 2025
概括
长期读取的DNA测序从土壤和沉积物中恢复了数千种新的微生物物种. 这一突破扩大了已知的微生物生命树,并改善了基因组数据分类.
科学领域:
- 微生物学 微生物学
- 基因组学就是基因组学.
- 生物信息学是一种生物信息学.
背景情况:
- 环境微生物基因组学对于理解生物多样性至关重要.
- 陆地生态系统拥有庞大的,在很大程度上没有特征的微生物多样性.
- 高通量测序技术正在推进微生物基因组恢复.
研究的目的:
- 利用长期阅读的纳米孔测序来从复杂的土壤和沉积物环境中深度恢复微生物基因组.
- 描述新型微生物物种,属和它们的遗传学多样性.
- 评估新发现的基因组对元基因组数据分析的影响.
主要方法:
- 154个土壤和沉积物样本的深度,长时间读取的纳米孔测序.
- 使用自定义的生物信息工作流 (mmlong2) 进行基因组组装和分析.
- 将新发现的基因组集成到公共基因组数据库中.
主要成果:
- 从15,314个以前未被描述的微生物物种中成功恢复了基因组.
- 扩大了微生物属的目录,增加了1086个新属.
- 增加了 prokaryotic 生命树的遗传多样性 8%.
- 能够恢复完整的核糖体RNA操作子,基因集群和CRISPR-Cas系统.
- 显著提高了土壤和沉积物元基因组数据集的物种级分类率.
结论:
- 长读测序提供了一种具有成本效益的方法,用于从复杂生态系统中高质量的微生物基因组恢复.
- 陆地环境是微生物生物多样性的重要,尚未开发的储存库.
- 扩展的基因组目录增强了我们对微生物进化和生态作用的理解.
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