The methyltransferase SETDB1 regulates a large neuron-specific topological chromatin domain.

The methyltransferase SETDB1 regulates a large neuron-specific topological chromatin domain.
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DOI:
10.1038/ng.3906
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发表时间:
2017-08
期刊:
影响因子:
30.8
通讯作者:
Akbarian S
Akbarian S
中科院分区:
生物学1区
文献类型:
--
作者:
Jiang Y;Loh YE;Rajarajan P;Hirayama T;Liao W;Kassim BS;Javidfar B;Hartley BJ;Kleofas L;Park RB;Labonte B;Ho SM;Chandrasekaran S;Do C;Ramirez BR;Peter CJ;C W JT;Safaie BM;Morishita H;Roussos P;Nestler EJ;Schaefer A;Tycko B;Brennand KJ;Yagi T;Shen L;Akbarian S

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We report locus-specific disintegration of megabase-scale chromosomal conformations in brain after neuronal ablation of Kmt1e/Setdb1 histone H3-lysine 9 methyltransferase, including a large topologically associated 1.2Mb domain conserved in human and mouse and encompassing >70 genes at the clustered Protocadherin (cPcdh) locus. TADcPcdh in mutant neurons showed abnormal accumulations of CTCF transcriptional regulator and 3D genome organizer at cryptic binding sites, converted into permissive state with DNA cytosine hypomethylation and histone hyperacetylation. Broadly upregulated expression across cPcdh included defective S-type Protocadherin single-cell stochastic constraint. Setdb1-dependent loop formations, bypassing 0.2–1Mb of linear genome, radiated from TADPcdh fringes towards cPcdh cis-regulatory sequences, counterbalanced shorter-range facilitative promoter-enhancer contacts and carried loop-bound polymorphisms associated with genetic risk for schizophrenia. We show that KRAB-zinc finger Setdb1 repressor complex, shielding neuronal 3D genomes from excess CTCF binding, is critically required for structural maintenance of TADcPcdh.
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