在营养应激下,大米中的染色体外圆形DNA的适应动态
Hanfang Ni1,2, Lenin Yong-Villalobos3, Mian Gu1,2
1National Key Laboratory of Crop Genetics & Germplasm Enhancement and Utilization, Nanjing Agricultural University, Nanjing, China.
Nature communications
|May 4, 2025
概括
米的染色体外圆形DNA (eccDNA) 随着发育和对营养压力的反应而发生变化. 这些eccDNAs,重叠的基因和TE,在和缺乏的情况下,有助于大米基因组的可塑性.
科学领域:
- 基因组学就是基因组学.
- 植物生物学 植物生物学
- 分子生物学分子生物学
背景情况:
- 众所周知,外染色体圆形DNA (eccDNA) 影响了真核生物的基因组可塑性.
- 农作物中eccDNAs的作用,特别是在环境压力下,基本上是未知的.
- 米 (Oryza sativa) 是植物基因组学的模型生物,也是全球重要的粮食来源.
研究的目的:
- 研究大米eccDNA的分布,序列和对营养压力的反应.
- 了解eccDNAs对大米基因组可塑性的贡献.
- 为了探索大米中的多片段eccDNAs的起源.
主要方法:
- 在大米发育阶段对eccDNA景观的全面分析.
- 识别与基因 (ecGenes),可转移元素 (ecTEs) 和重复单元 (ecRepeatUnits) 重叠的eccDNA.
- 研究eccDNA对 (N) 和 (P) 缺乏的反应.
主要成果:
- 在不同发育阶段,大米中的eccDNA格局会发生变化.
- 由于N和P缺乏,ecGenes,ecte和ecRepeatUnits的患病率发生了变化.
- 提出了一种TE介导的同源重组机制,用于形成多片段eccDNAs.
结论:
- 在营养压力下,大米eccDNA在基因组可塑性中发挥作用.
- 在N和P缺乏下,eccDNA的丰度和特异性是显著的.
- 这项研究为作物植物的eccDNA功能提供了新的见解.
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