Discovering hematopoietic mechanisms through genome-wide analysis of GATA factor chromatin occupancy.

Discovering hematopoietic mechanisms through genome-wide analysis of GATA factor chromatin occupancy.
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DOI:
10.1016/j.molcel.2009.11.001
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发表时间:
2009-11-25
期刊:
影响因子:
16
通讯作者:
Bresnick EH
Bresnick EH
中科院分区:
生物学1区
文献类型:
--
作者:
Fujiwara T;O'Geen H;Keles S;Blahnik K;Linnemann AK;Kang YA;Choi K;Farnham PJ;Bresnick EH

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GATA factors interact with simple DNA motifs (WGATAR) to regulate critical processes, including hematopoiesis, but very few WGATAR motifs are occupied in genomes. Given the rudimentary knowledge of mechanisms underlying this restriction, and how GATA factors establish genetic networks, we used ChIP-seq to define GATA-1 and GATA-2 occupancy genome-wide in erythroid cells. Coupled with genetic complementation analysis and transcriptional profiling, these studies revealed a rich collection of targets containing a characteristic binding motif of greater complexity than WGATAR. GATA factors occupied loci encoding multiple components of the Scl/TAL1 complex, a master regulator of hematopoiesis and leukemogenic target. Mechanistic analyses provided evidence for cross-regulatory and autoregulatory interactions among components of this complex, including GATA-2 induction of the hematopoietic corepressor ETO-2 and an ETO-2 negative autoregulatory loop. These results establish fundamental principles underlying GATA factor mechanisms in chromatin and illustrate a complex network of considerable importance for the control of hematopoiesis.
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