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Regulation of active DNA Demethylation by an α-crystallin domain protein in arabidopsis

机译:拟南芥中α-晶状体结构域蛋白对活性DNA去甲基化的调控

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摘要

DNA methylation patterns are dynamically controlled by DNA methylation and active DNA demethylation, but the mechanisms of regulation of active DNA demethylation are not well understood. Through forward genetic screens for Arabidopsis mutants showing DNA hypermethylation at specific loci and increased silencing of reporter genes, we identified IDM2 (increased DNA methylation 2) as a regulator of DNA demethylation and gene silencing. IDM2 dysfunction causes DNA hypermethylation and silencing of reporter genes and some endogenous genes. These effects of idm2 mutations are similar to those of mutations in IDM1, a regulator of active DNA demethylation. IDM2 encodes an α-crystallin domain protein in the nucleus. IDM2 and IDM1 interact physically and partially colocalize at discrete subnuclear foci. IDM2 is required for the full activity of H3K18 acetylation but not H3K23 acetylation of IDM1 in planta. Our results suggest that IDM2 functions in active DNA demethylation and in antisilencing by regulating IDM1.
机译:DNA甲基化模式是由DNA甲基化和活性DNA脱甲基化动态控制的,但对活性DNA脱甲基化调节的机制尚不清楚。通过对拟南芥突变体进行正向遗传筛选,显示其在特定基因座处的DNA甲基化程度较高,而报告基因的沉默水平升高,我们确定IDM2(DNA甲基化程度2的升高)是DNA去甲基化和基因沉默的调节剂。 IDM2功能异常会导致DNA超甲基化,并使报告基因和某些内源基因沉默。 idm2突变的这些作用类似于IDM1(活性DNA脱甲基调节剂)的那些作用。 IDM2在细胞核中编码一个α-晶状体结构域蛋白。 IDM2和IDM1在离散的亚核灶上发生物理相互作用并部分共定位。 IDM2是植物中IDM1的H3K18乙酰化的全部活性所必需的,而不是H3K23乙酰化的全部活性。我们的结果表明IDM2通过调节IDM1在主动DNA脱甲基和抗沉默中起作用。

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