GIGANTEA作为冷压应激反应的联合抑制剂,与基因素修饰复合物一起起作用
Myung Geun Ji1, Jin-Sung Huh1, Chae Jin Lim2
1Division of Applied Life Science (BK21 four), Plant Biological Rhythm Research Center, Plant Molecular Biology and Biotechnology Research Center, Gyeongsang National University, Jinju, 52828, Republic of Korea; Research Institute of Life Science, Institute of Agriculture & Life Sciences, Gyeongsang National University, Jinju, 52828, Republic of Korea.
Plant physiology and biochemistry : PPB
|March 29, 2025
概括
生物钟蛋白GIGANTEA (GI) 通过与HOS15和HD2C合作,帮助植物耐受寒冷. 胃肠道抑制了对寒冷反应的基因,增强了植物的抗寒性.
科学领域:
- 植物生物学 植物生物学
- 分子生物学分子生物学
- 时间生物学 时间生物学
背景情况:
- 植物的昼夜时钟调节压力反应,包括耐寒性.
- 高度表达的奥斯莫性响应基因15 (HOS15) - - 基因组脱乙酶2C (HD2C) 复合物调节了对寒冷耐受性的冷调节基因 (COR) 的基因脱乙.
研究的目的:
- 为了研究昼夜振荡器GIGANTEA (GI) 在植物耐寒性中的作用.
- 阐明GI与HOS15-HD2C复合体相互作用的分子机制,以调节对冷反应的基因表达.
主要方法:
- 使用双重突变 (hos15-2 gi-2) 的基因分析.
- 染色体免疫沉 (ChIP) 来评估在COR基因促进体中的基因乙化和转录因子结合 (CBF).
- 在寒冷压力下对COR基因的基因表达分析.
主要成果:
- GIGANTEA (GI) 调节了基因素脱乙酶复合体在COR基因促进体上的关联,控制了耐寒性.
- 胃肠道功能是HOS15的下游,而hos15-2gi-2双突变体表现出增强的冷耐受性和COR基因表达.
- 在寒冷压力下,GI减少了基因组乙化和C-REPEAT结合因子 (CBF) 在COR15A促进体的结合,从而抑制了COR15A的表达.
- 胃肠道与HOS15和HD2C形成一个共抑制器复合体,抑制CBF结合和COR基因激活.
结论:
- 胃肠道在植物寒冷应激反应中发挥着关键作用,通过调节COR基因位点的染色质状态.
- GI-HOS15-HD2C复合体在正常条件下和在寒冷压力时,作为冷反应基因的抑制剂.
- 这些发现揭示了一种新的染色质介导的调节途径,用于植物耐寒性,涉及到昼夜时钟.
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