A sequence motif within chromatin entry sites directs MSL establishment on the Drosophila X chromosome.

A sequence motif within chromatin entry sites directs MSL establishment on the Drosophila X chromosome.
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DOI:
10.1016/j.cell.2008.06.033
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发表时间:
2008-08-22
期刊:
影响因子:
64.5
通讯作者:
Kuroda MI
Kuroda MI
中科院分区:
生物学1区
文献类型:
--
作者:
Alekseyenko AA;Peng S;Larschan E;Gorchakov AA;Lee OK;Kharchenko P;McGrath SD;Wang CI;Mardis ER;Park PJ;Kuroda MI

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果蝇MSL复合物特异性地与雄性X染色体上的活性基因结合,使组蛋白H4的赖氨酸16乙酰化,并使表达量增加约两倍。到目前为止,尚未发现能够解释MSL结合特异性的DNA序列。我们假设序列特异性靶向发生在“染色质进入位点”,但大多数位点是不依赖序列的。在这里,我们通过ChIP - chip和ChIP - seq对150个潜在的进入位点进行了表征,并发现了一个富含GA的MSL识别元件(MRE)。该基序在X染色体上仅略微富集(约2倍),但考虑到它在活性基因内部或3’端的优先位置时,富集倍数会翻倍(>4倍富集)。当插入常染色体时,一个新鉴定的位点可以引导局部MSL扩散到侧翼的活性基因。这些结果为MSL将剂量补偿靶向雄性X染色体过程中依赖序列和不依赖序列的步骤都提供了有力证据。
The Drosophila MSL complex associates with active genes specifically on the male X chromosome to acetylate histone H4 at lysine 16, and increase expression approximately two-fold. To date, no DNA sequence has been discovered to explain the specificity of MSL binding. We hypothesized that sequence-specific targeting occurs at “chromatin entry sites”, but the majority of sites are sequence-independent. Here we characterize 150 potential entry sites by ChIP-chip and ChIP-seq and discover a GA-rich MSL recognition element (MRE). The motif is only slightly enriched on the X chromosome (~2 fold), but this is doubled when considering its preferential location within or 3’ to active genes (>4 fold enrichment). When inserted on an autosome, a newly identified site can direct local MSL spreading to flanking active genes. These results provide strong evidence for both sequence-dependent and -independent steps in MSL targeting of dosage compensation to the male X chromosome.
DOI: 10.1038/386275a0
发表时间: 1997-03-20
期刊: NATURE
影响因子: 64.8
作者:
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通讯作者: Jaenisch, R
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发表时间: 1999-08-20
期刊: CELL
影响因子: 64.5
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