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Epigenetic regulation of transcription in intermediate heterochromatin

机译:表观遗传调控转录的中间异染色质

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Constitutive heterochromatin is a compact, transcriptionally inert structure formed in gene-poor and repeat- and transposon-rich regions. In Arabidopsis, constitutive heterochromatin is characterized by hypermethylated DNA and histone H3 dimethylated at lysine (K) 9 (H3K9me2) together with depletion of histone H3 dimethylated at lysine 4 (H3K4me2). Here, we describe loci with intermediate properties of heterochromatin in which transcription downregulation is inherited in a manner similar to constitutive heterochromatin, although the loci are associated with opposing histone marks—H3K4me2 and H3K9me2. In the ddm1 (decrease in DNA methylation 1) mutants, their transcriptional activation is accompanied by the expected shift in the H3 modifications—depletion of H3K9me2 and enrichment in H3K4me2. In mom1 (Morpheus' molecule 1) mutants, however, a marked increase in transcription is not accompanied by detectable changes in the levels of H3K4me2 and H3K9me2. Therefore, transcriptional regulation in the intermediate heterochromatin involves two distinct epigenetic mechanisms. Interestingly, silent transgenic inserts seem to acquire properties characteristic of the intermediate heterochromatin.
机译:结构异染色质是一个紧凑,转录惰性结构形成gene-poor和重复,transposon-rich地区。异染色质的特点是hypermethylated DNA和组蛋白H3 dimethylated在赖氨酸(K) 9 (H3K9me2)与损耗的组蛋白H3 dimethylated赖氨酸4 (H3K4me2)。在这里,我们描述与中间位点属性的异染色质是遗传差别转录对这些的方式类似于结构异染色质,虽然基因座与对方相关联组蛋白marks-H3K4me2 H3K9me2。(减少DNA甲基化1)突变体,他们转录激活是伴随着H3 modifications-depletion预期的转变在H3K4me2 H3K9me2和浓缩。(睡眠的分子1)突变体,然而,一个标志增加转录并不是伴随着可检测H3K4me2的水平和变化H3K9me2。中间异染色质包含两个不同的表观遗传机制。沉默的转基因插入似乎获得中间的属性特征异染色质。

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