酶性DNA去甲基化使番茄中形成稳定的表皮转化
Javier Antunez-Sanchez1, Julia Engelhorn1, Sara Lopez-Gomollon2
1School of Life Sciences, University of Warwick, Coventry, United Kingdom.
Journal of experimental botany
|March 10, 2026
概括
番茄中人类TET3的宫外表达稳定地改变了几代人的DNA甲基化. 这种表观遗传修饰影响了基因表达和可转移元素活性,揭示了脱甲基和植物表观遗传调节之间的相互作用.
科学领域:
- 植物表观遗传学 植物表观遗传学
- DNA甲基化动态的动态
- 表观遗传遗传 表观遗传遗传是一种表观遗传.
背景情况:
- 基因甲基化对植物基因调节,发育和沉默可转移元素 (TE) 至关重要.
- 目前用于诱导植物遗传性表皮转移的方法缺乏精度和稳定性.
- 番茄的大型,富含TE的基因组为研究表观遗传修饰带来了独特的挑战.
研究的目的:
- 通过异位表达人类TEN-ELEVEN TRANSLOCATION3催化域 (hTET3cd) 来研究番茄全球改变DNA甲基化的效应.
- 评估hTET3cd.诱导的DNA甲基化变化的稳定性和遗传性.
- 探索向DNA脱甲基化和内生植物表观遗传通路之间的相互作用.
主要方法:
- 在番茄植物中hTET3cd的异胎表达.
- 全基因组双硫酸盐测序用于分析DNA甲基化模式 (CG,CHG,CHH).
- 不同甲基化区域 (DMR) 分析和转录基因分析 (RNA-seq).
主要成果:
- hTET3cd表达诱导了稳定,可遗传的CG和CHG位点的低甲基化.
- 在色素中脱甲基化通常与CHH甲基化增长相结合,这表明RNA导向DNA甲基化 (RdDM) 途径的激活.
- 观察到广泛的CG/CHG甲基化损失和复杂的CHH DMRs,影响TET3和非转基因后代的TE和基因表达.
结论:
- 使用hTET3cd对甲基组的酶性操纵可以在植物中产生稳定,可遗传的表观遗传变异.
- 向的DNA脱甲基化与内源性机制动态相互作用,以维持表观遗传恒常性.
- 这项研究提供了一种用于植物研究和育种的稳定表生成的新工具.
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