Requirement for flap endonuclease 1 (FEN1) to maintain genomic stability and transcriptional gene silencing in Arabidopsis.

Requirement for flap endonuclease 1 (FEN1) to maintain genomic stability and transcriptional gene silencing in Arabidopsis.
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拟南芥中需要瓣状核酸内切酶 1 (FEN1) 来维持基因组稳定性和转录基因沉默

DOI:
10.1111/tpj.13224
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发表时间:
2016-09
期刊:
The Plant journal : for cell and molecular biology
影响因子:
--
通讯作者:
Gong Z
Gong Z
中科院分区:
其他
文献类型:
--
作者:
Zhang J;Xie S;Zhu JK;Gong Z

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作为Okazaki片段成熟的中心成分,FEN1(FEN1)去除5‘-FAP并维持基因组的稳定性。在这里,FEN1被克隆为正向遗传筛查中转录基因沉默(TGS)的抑制因子。FEN1在根和地上部顶端分生组织中含量丰富,FEN1-GFP在烟草细胞中显示核仁定位信号。拟南芥fen1-1突变体对甲烷磺酸甲酯高度敏感,端粒长度缩短。有趣的是,全基因组染色质免疫沉淀和RNA测序结果表明,FEN1突变导致H3K27me3水平下降,标记为H3K27me3的基因子集表达增加。总体而言,这些结果揭示了FEN1在介导TGS以及维持拟南芥基因组稳定性方面的作用。
As a central component in the maturation of Okazaki fragments, flap endonuclease 1 (FEN1) removes the 5′-flap and maintains genomic stability. Here, FEN1 was cloned as a suppressor of transcriptional gene silencing (TGS) from a forward genetic screen. FEN1 is abundant in the root and shoot apical meristems and FEN1-GFP shows a nucleolus-localized signal in tobacco cells. The Arabidopsis fen1-1 mutant is hypersensitive to methyl methanesulfonate and shows reduced telomere length. Interestingly, genome-wide chromatin immunoprecipitation and RNA sequencing results demonstrate that FEN1 mutation leads to a decrease in the level of H3K27me3 and an increase in the expression of a subset of genes marked with H3K27me3. Overall, these results uncover a role for FEN1 in mediating TGS as well as maintaining genome stability in Arabidopsis.
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