在Patescibacteria的tRNA基因中的I组内子
Yuna Nakagawa1,2, Kazuaki Amikura2, Kimiho Omae2
1Department of Integrated Biosciences, Graduate School of Frontier Sciences, The University of Tokyo, Kashiwa, Chiba, Japan.
mSystems
|January 30, 2026
概括
内子虽然在细菌中很少见,但在Patescibacteria中很常见. 在Patescibacteria中,I组内子,特别是tRNA内子,表现出独特的特征,并且可能在减少的基因组中充当调节元件.
科学领域:
- 微生物学 微生物学
- 分子生物学分子生物学
- 基因组学就是基因组学.
背景情况:
- 内子在细菌基因组中通常是罕见的.
- 病菌具有高度缩小的基因组,使其内核含量不寻常.
- 标准注释工具往往错过了某些细菌内核,特别是tRNA基因中的I组内核.
研究的目的:
- 为了研究Patescibacteria中的内子的多样性,功能和进化.
- 在Patescibacteria中识别以前未被检测到的tRNA内核.
- 分析细菌中I组和II组内基子的遗传分布和特征.
主要方法:
- 对95个Patescibacteria基因组的生物信息分析.
- 在反子循环中,在异常位置 (35/36) 的tRNA内子的识别.
- 在体外拼接测试以确认内核自拼接.
- 跨细菌族群的大规模比较基因组调查.
主要成果:
- 在Patescibacteria中发现了以前未被检测到的tRNAAsn和tRNAAsp基因,这是由于I组子位于35/36位置.
- 在实验室中证实了这些不寻常的I组内的精确自我拼接.
- 在Patescibacteria中发现了在35/36位置的内部插入,高度丰富,其中亚组IA内部插入占主导地位.
- 在Patescibacteria和Cyanobacteriota中观察到I组内的高发病率 (~40%),但在Patescibacteria中没有II组内.
结论:
- 帕特西细菌表现出独特的内形状,与其他细菌类不同.
- 在Patescibacteria中,I组内子可以作为基于RNA的调节元素,补偿基因组减少.
- 这项研究突出了细菌中被忽视的内子的遗传分布.
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