在苗的光和激素反应中改变了染色质可访问性
Haoxuan Li1,2,3, Xiaozheng Li2, Jianhua Zhang1,3
1School of Life Sciences, AoE Centre for Plant Vacuole Biology and Biotechnology, and State Key Laboratory of Agrobiotechnology, The Chinese University of Hong Kong, Shatin, Hong Kong.
Plant physiology
|September 26, 2025
概括
光极大地重塑了大米苗的表观基因组,改变了光合作用至关重要的过渡期间控制基因表达的染色质可访问性. 这种表观遗传重编程对于植物的适应和生存至关重要.
科学领域:
- 植物生物学 植物生物学
- 表观遗传学 在表观遗传学中,表观遗传学是指表观遗传学.
- 分子生物学分子生物学
背景情况:
- 光对于植物的发育至关重要,它可以使植物从 skotomorphogenesis (黑暗生长) 转向光形生长 (光生长).
- 控制大米 (Oryza sativa) 幼苗中这种光感应过渡的表观遗传机制尚不清楚.
研究的目的:
- 为了研究光线如何改变苗光形生成期间的染色质可访问性和基因表达.
- 探索像GOLDEN2-LIKE (GLKs) 这样的转录因子在光介导基因调节中的作用.
- 为了检查植物激素的印醇-3-酸 (IAA) 和酸 (ABA) 对染色质可访问性和转录性的影响.
主要方法:
- 使用ATAC-seq.进行全基因组对染色质可访问性的分析.
- 评估RNA聚合酶II (Pol II) 占用率以测量转录活性.
- 对染色质可访问性和Pol II占用数据的综合分析.
- 外源IAA和ABA的应用用于研究激素效应.
主要成果:
- 光线显著改变了大米苗的全基因组染色质可访问性.
- 与光合作用相关的基因显示染色体可访问性增加,而整体染色体在暴露于光线时倾向于关闭,与减少的Pol II占用相关.
- GLK转录因子与光诱导的开放色素区域结合,促进叶绿体的发展.
- IAA和ABA不同调节染色体的开放性和转录活动,IAA促进开放性,ABA促进抑制性.
结论:
- 染色质可访问性的光诱导的表观遗传变化对苗光形生成至关重要.
- GLKs通过与光敏感的开放色素结合,在建立光自增殖中发挥关键作用.
- IAA和ABA具有不同的表观遗传效应,影响米苗中的染色质结构和基因转录.
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