考古限制修改系统的调查
Brian P Anton1, Richard J Roberts1
1New England Biolabs, Ipswich, MA 02127, USA.
Microorganisms
|October 28, 2023
概括
考古物具有与细菌相似的限制-修饰系统,DNA甲基转移酶 (MTases) 如m6A,m4C和m5C发挥关键的表观遗传作用. 在Crenarchaea中,C ((m5C) WGG位点的甲基化显著.
科学领域:
- 微生物学 微生物学
- 基因组学就是基因组学.
- 表观遗传学 在表观遗传学中,表观遗传学是指表观遗传学.
背景情况:
- 限制-修改 (RM) 系统在细菌中得到了很好的研究,但在古生物中不太了解,特别是在 haloarchaea 外.
- 古代生物和细菌共享一个共同的遗传库RM系统,通过横向基因转移获得.
研究的目的:
- 通过对REBASE数据库进行调查,对已知的考古RM系统进行编目.
- 调查 DNA 甲基转移酶 (MTases) 在考古基因组中的流行和功能.
- 探索古生物中的特定甲基化模式的表观遗传作用.
主要方法:
- 在REBASE数据库中对RM系统基因进行了519个考古基因组的调查.
- 利用单分子实时测序 (SMRT) 对49个古人类基因组的甲基组数据.
- 一个持久的MTase组的实验验证的同类成员.
主要成果:
- 古生物中的RM系统与细菌对应物具有组织和序列的相似性.
- 识别了许多"持久"的DNAMTases,在古老的种类中保存.
- 证实C) WGG位点甲基化可能在Crenarchaea中具有表观遗传学意义.
- 观察到m6A,m4C和m5CDNAMTase基因的比例约为4:2:1,分别分布在古生物中.
结论:
- 古生物拥有多样化的RM系统,与细菌系统具有显著的功能重叠.
- 持久的DNAMTases是古生物中保存的特征,这表明它们扮演着重要的角色.
- 特定的DNA甲基化模式,如C(m5C) WGG,可能在古生物中发挥关键的表观遗传功能.
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