miR159b是RSI1/FLD的表观遗传标,对系统性获得性耐药性的负面调节
Ranjan Kumar1, Reena Saini1, Deepjyoti Singh1
1School of Life Sciences, Jawaharlal Nehru University, New Delhi, 110067, India.
The Plant journal : for cell and molecular biology
|October 15, 2025
概括
植物通过表观遗传调节来发展系统性获得性耐药性 (SAR). 这项研究揭示了RSI1/FLD如何控制miR159b,影响植物免疫力和防御记忆的关键基因.
科学领域:
- 植物免疫力和防御机制
- 表观遗传学和基因调控
- 分子植物病理学 分子植物病理学
背景情况:
- 植物拥有一种称为系统性获得性抵抗 (SAR) 的防御记忆,可以抵抗病原体的重新入侵.
- 感染组织的移动信号启动SAR,但下游的分子事件仍然不清楚.
- 已知表观遗传调节器RSI1/FLD对于SAR激活至关重要.
研究的目的:
- 阐明在移动信号感知后SAR激活的下游分子机制.
- 调查RSI1/FLD在调节SAR中涉及的基因中的作用.
- 确定微RNA 159b (miR159b) 的标及其对SAR的贡献.
主要方法:
- 研究了RSI1/FLD和MIR159B位点之间的相互作用.
- 分析了对RSI1/FLD和miR159b操纵的反应中的基因表达变化.
- 利用生物信息学和表达分析来确定miR159的目标.
- 在野生型,突变型和转基因Arabidopsis thaliana系中评估SAR表型.
主要成果:
- RSI1/FLD负面调节miR159b表达,并与MIR159B位点的脱甲基化有关.
- 过度表达miR159b抑制SAR,而其缺乏则增强SAR.
- 确定了多个miR159目标,这些目标正面 (例如SDG14,RD19A) 和负面 (例如MYB97) 调节SAR发展.
结论:
- RSI1/FLD在miR159b的上游作用,为SAR建立了一个新的表观遗传调节途径.
- miR159b通过准参与植物防御的基因网络来微调SAR.
- 这项研究揭示了一种功能性基因网络,该基因网络可以激活和调节Arabidopsis.
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