染色质
生物
表观遗传学
染色质免疫沉淀
嘉雅宠物
细胞生物学
拟南芥
遗传学
转录组
基因
染色质重塑
基因表达调控
基因表达
突变体
发起人
作者
Yan Wang,Wang Fei,Hong Lü,Rongbin Lin,Jiaming Liu,Yu Liu,Jiming Xu,Yinshan Wu,Zhiye Wang,Ming Zhou,Xiaoning Mo,Zhongchang Wu,Huixia Shou,Shao Jian Zheng,Chuanzao Mao
摘要
Summary Although phosphorus is one of the most important essential elements for plant growth and development, the epigenetic regulation of inorganic phosphate (Pi) signaling is poorly understood. In this study, we investigated the biological function and mode of action of the high‐mobility‐group box 1 protein OsHMGB1 in rice ( Oryza sativa ), using molecular and genetic approaches. We determined that OsHMGB1 expression is induced by Pi starvation and encodes a nucleus‐localized protein. Phenotypic analysis of Oshmgb1 mutant and OsHMGB1 overexpression transgenic plants showed that OsHMGB1 positively regulates Pi homeostasis and plant growth. Transcriptome deep sequencing and chromatin immunoprecipitation followed by sequencing indicated that OsHMGB1 regulates the expression of a series of phosphate starvation–responsive (PSR) genes by binding to their promoters. Furthermore, an assay for transposase‐accessible chromatin followed by sequencing revealed that OsHMGB1 is involved in maintaining chromatin accessibility. Indeed, OsHMGB1 occupancy positively correlated with genome‐wide chromatin accessibility and gene expression levels. Our results demonstrate that OsHMGB1 is a transcriptional facilitator that regulates the expression of a set of PSR genes to maintain Pi homeostasis in rice by increasing the chromatin accessibility, revealing a key epigenetic mechanism that fine‐tune plant acclimation responses to Pi‐limited environments.
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