The PAF complex synergizes with MLL fusion proteins at HOX loci to promote leukemogenesis.

The PAF complex synergizes with MLL fusion proteins at HOX loci to promote leukemogenesis.
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DOI:
10.1016/j.ccr.2010.04.012
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发表时间:
2010-06-15
期刊:
影响因子:
50.3
通讯作者:
Hess JL
Hess JL
中科院分区:
医学1区
文献类型:
--
作者:
Muntean AG;Tan J;Sitwala K;Huang Y;Bronstein J;Connelly JA;Basrur V;Elenitoba-Johnson KS;Hess JL

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MLL参与染色体重排,产生转录活性不受调节的融合蛋白。MLL融合蛋白介导的转录激活机制尚不清楚。在这里,我们发现MLL通过CxxC结构域两侧的序列直接与聚合酶相关因子复合物(PAFc)相互作用。PAFc与RNA聚合酶II相互作用,刺激翻译后组蛋白修饰。PAFc增强了MLL和MLL- af9介导的Hoxa9的转录激活。相反,敲低PAFc会破坏MLL融合蛋白介导的转录激活和MLL向靶位点的募集。PAFc基因在造血过程中表达下调,可能调节MLL功能。MLL的缺失消除了与PAFc的相互作用,也消除了MLL- af9介导的永生化,表明这种相互作用在白血病发生中的重要功能。
MLL is involved in chromosomal rearrangements that generate fusion proteins with deregulated transcriptional activity. The mechanisms of MLL fusion protein-mediated transcriptional activation are poorly understood. Here we show MLL interacts directly with the Polymerase Associated Factor complex (PAFc) through sequences flanking the CxxC domain. PAFc interacts with RNA polymerase II and stimulates post-translational histone modifications. PAFc augments MLL and MLL-AF9 mediated transcriptional activation of Hoxa9. Conversely, knock down of PAFc disrupts MLL fusion protein-mediated transcriptional activation and MLL recruitment to target loci. PAFc gene expression is down regulated during hematopoiesis and likely serves to regulate MLL function. Deletions of MLL that abolish interactions with PAFc also eliminate MLL-AF9 mediated immortalization indicating an essential function for this interaction in leukemogenesis.
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