在Pyricularia oryzae的染色体中,中间体序列的异步进化
Atsumi Morimoto1, Thach An Dang1, Ken-Ichi Ikeda1
1Graduate School of Agricultural Science, Kobe University.
Genes & genetic systems
|February 2, 2025
概括
Pyricularia oryzae 中心体很大,富含AT,重复性很强. 发现了一种新元素,CenIR,其序列变化表明由突变驱动的快速,不均的进化.
科学领域:
- 基因组学就是基因组学.
- 菌类生物学 菌类生物学
- 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:
- 中介质对于染色体分离至关重要,但其发展速度很快.
- 驱动中心分子进化的机制仍然不清楚.
- 皮里库拉里亚 (Pyricularia oryzae) 是一个重要的小麦病原体.
研究的目的:
- 为了识别和描述Pyricularia oryzae (株Br48) 中心层序列.
- 为了研究重复的元素和表观遗传修饰在这些中心体内.
- 为了比较不同P. oryzae菌株的中间体进化.
主要方法:
- CENP-A染色体免疫沉,随后进行高通量测序 (ChIP-seq).
- 对序列组成,重复内容和表观遗传标记的生物信息分析.
- 跨P. oryzae菌株的比较基因组学.
主要成果:
- Br48的中间体是71-101kb,富含AT (72.1-75.5%) 和重复 (63.4-85.0%) 的.
- 中心体富含H3K9me3和5-甲基细胞因,缺少H3K4me2和H3K27me3.
- 发现了一种新型的~530bp元素,CenIR (中微粒相关的IR元素),经常形成反转的重复.
- 中心层序列进化是不均的,并不严格遵循真菌的基因组.
- 类似于重复诱导的点突变 (RIP) 的过渡可能是驱动基替代.
结论:
- Pyricularia oryzae 中心体具有独特的序列和表观遗传特征.
- 这种CenIR元素是与P. oryzae中位素相关的关键组成部分.
- 在P. oryzae中,快速且不均的中粒体进化受到像RIP.这样的序列组成和突变过程的影响.
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