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
中科院分区:
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
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.
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