Drosophila H1 regulates the genetic activity of heterochromatin by recruitment of Su(var)3-9.

Drosophila H1 regulates the genetic activity of heterochromatin by recruitment of Su(var)3-9.
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DOI:
10.1126/science.1234654
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发表时间:
2013-04-05
期刊:
Science (New York, N.Y.)
影响因子:
--
通讯作者:
Skoultchi AI
Skoultchi AI
中科院分区:
其他
文献类型:
--
作者:
Lu X;Wontakal SN;Kavi H;Kim BJ;Guzzardo PM;Emelyanov AV;Xu N;Hannon GJ;Zavadil J;Fyodorov DV;Skoultchi AI

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真核基因组含有转座因子和其他必须沉默的重复序列。小RNA干扰途径在其抑制中起主要作用。在这里,我们揭示了在果蝇中沉默这些序列的另一种机制。在体内耗尽连接体组蛋白H1导致这些元件的强烈活化。H1介导的沉默与异染色质特异性组蛋白H3赖氨酸9甲基转移酶Su(var)3-9结合发生。H1与Su(var)3-9物理相互作用,并在体外将其招募到染色质,这促进了H3甲基化。我们认为H1通过将Su(var)3-9连接到异染色质上而在沉默中起关键作用。H1的拴系功能增加了其作为染色质致密化和可接近性调节剂的既定作用。
Eukaryotic genomes harbor transposable elements and other repetitive sequences that must be silenced. Small RNA interference pathways play a major role in their repression. Here, we reveal another mechanism for silencing these sequences in Drosophila. Depleting the linker histone H1 in vivo leads to strong activation of these elements. H1-mediated silencing occurs in combination with the heterochromatin-specific histone H3 lysine 9 methyltransferase Su(var)3-9. H1 physically interacts with Su(var)3-9 and recruits it to chromatin in vitro, which promotes H3 methylation. We propose that H1 plays a key role in silencing by tethering Su(var)3-9 to heterochromatin. The tethering function of H1 adds to its established role as a regulator of chromatin compaction and accessibility.
DOI: 10.1016/s1097-2765(01)00218-0
发表时间: 2001-04-01
期刊: MOLECULAR CELL
影响因子: 16
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