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Updated: Jul 5, 2025

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植物细胞类型特定的 cis-regulatory 元素的演变
bioRxiv : the preprint server for biology
|January 23, 2024
概括
在植物中理解 cis-regulatory element (CRE) 演变是复杂的. 这项研究揭示了染色质可访问性如何因细胞类型和物种而异,揭示了对调控元件的保护和演变的见解.
科学领域:
- 植物基因组学 植物基因组学
- 进化生物学是进化的生物学.
- 基因调节 基因调节
背景情况:
- 基因调节元件 (CREs) 对于控制基因表达至关重要.
- 特别是在植物中,CREs的进化动态尚不清楚.
- 染色素可访问性在定义活性调节区域方面发挥着关键作用.
研究的目的:
- 构建一个全面的单细胞地图书,显示大米 (Oryza sativa) 中的染色质可访问性.
- 在多种草种中进行比较基因组学,以了解CRE进化.
- 为了研究染色质可访问性,保存性和细胞类型特异性之间的关系.
主要方法:
- 在103,911个米核上使用测序 (scATAC-seq) 进行转化酶可访问色素的单细胞测定.
- 比较基因组学整合了来自大米和四种其他草种 (Zea mays, Sorghum bicolor, Panicum miliaceum, Urochloa fusca) 的数据.
- 对可访问的染色体区域 (ACRs) 进行保护,细胞类型特异性的分析,并与基因素修饰重叠 (H3K27me3).
主要成果:
- 在9个大米器官中确定了126个离散的细胞状态.
- 发现不同水平的ACR保存与细胞类型特异性相关.
- 皮肤上ACRs的保护性较低,这表明该层的快速调节演变.
- 发现保存的ACR重叠H3K27me3,可能充当沉声器类元素.
结论:
- 对比基因组学揭示了植物细胞类型特定的CREs的动态进化.
- 染色体可访问性模式提供了对监管元素的保护和分歧的见解.
- 该研究强调了监管演变的潜在机制,包括特定细胞类型的快速变化和保存的沉声元件.
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