He Xin-Jian, Hsu Yi-Feng, Zhu Shihua, Liu Hai-Liang, Pontes Olga, Zhu Jianhua, Cui Xinping, Wang Co-Shine, Zhu Jian-Kang
Institute for Integrative Genome Biology and Department of Botany and Plant Sciences, University of California at Riverside, Riverside, California 92521, USA.
Genes Dev. 2009 Dec 1;23(23):2717-22. doi: 10.1101/gad.1851809. Epub 2009 Nov 10.
RNA-directed DNA methylation (RdDM) is a conserved mechanism for epigenetic silencing of transposons and other repetitive elements. We report that the rdm4 (RNA-directed DNA Methylation4) mutation not only impairs RdDM, but also causes pleiotropic developmental defects in Arabidopsis. Both RNA polymerase II (Pol II)- and Pol V-dependent transcripts are affected in the rdm4 mutant. RDM4 encodes a novel protein that is conserved from yeast to humans and interacts with Pol II and Pol V in plants. Our results suggest that RDM4 functions in epigenetic regulation and plant development by serving as a transcriptional regulator for RNA Pol V and Pol II, respectively.
RNA 指导的 DNA 甲基化(RdDM)是转座子和其他重复元件表观遗传沉默的保守机制。我们报道,rdm4(RNA 指导的 DNA 甲基化 4)突变不仅损害 RdDM,还在拟南芥中导致多效性发育缺陷。rdm4 突变体中依赖 RNA 聚合酶 II(Pol II)和 Pol V 的转录本均受到影响。RDM4 编码一种从酵母到人类都保守的新型蛋白质,并在植物中与 Pol II 和 Pol V 相互作用。我们的结果表明,RDM4 分别作为 RNA Pol V 和 Pol II 的转录调节因子,在表观遗传调控和植物发育中发挥作用。