title: Molecular hallmarks of endogenous chromatin complexes containing master regulators of hematopoiesis.
abstract: Combinatorial interactions among trans-acting factors establish transcriptional circuits that orchestrate cellular differentiation, survival, and development. Unlike circuits instigated by individual factors, efforts to identify gene ensembles controlled by multiple factors simultaneously are in their infancy. A paradigm has emerged in which the important regulators of hematopoiesis GATA-1 and GATA-2 function combinatorially with Scl/TAL1, another key regulator of hematopoiesis. The underlying mechanism appears to involve preferential assembly of a multimeric complex on a composite DNA element containing WGATAR and E-box motifs. Based on this paradigm, one would predict that GATA-2 and Scl/TAL1 would commonly co-occupy such composite elements in cells. However, chromosome-wide analyses indicated that the vast majority of conserved composite elements were occupied by neither GATA-2 nor Scl/TAL1. Intriguingly, the highly restricted set of GATA-2-occupied composite elements had characteristic molecular hallmarks, specifically Scl/TAL1 occupancy, a specific epigenetic signature, specific neighboring cis elements, and preferential enhancer activity in GATA-2-expressing cells. Genes near the GATA-2-Scl/TAL1-occupied composite elements were regulated by GATA-2 or GATA-1, and therefore these fundamental studies on combinatorial transcriptional mechanisms were also leveraged to discover novel GATA factor-mediated cell regulatory pathways.
authors.affiliation: University of Wisconsin School of Medicine and Public Health, Department of Pharmacology, Madison, WI 53706, USA.
authors.forename: Ryan J
authors.initials: RJ
authors.lastname: Wozniak
authors.forename: Sunduz
authors.initials: S
authors.lastname: Keles
authors.forename: Jesse J
authors.initials: JJ
authors.lastname: Lugus
authors.forename: Ken H
authors.initials: KH
authors.lastname: Young
authors.forename: Meghan E
authors.initials: ME
authors.lastname: Boyer
authors.forename: Tuan M
authors.initials: TM
authors.lastname: Tran
authors.forename: Kyunghee
authors.initials: K
authors.lastname: Choi
authors.forename: Emery H
authors.initials: EH
authors.lastname: Bresnick
mesh_terms: D000818:Animals; D001483:Base Sequence; D051792:Basic Helix-Loop-Helix Proteins / Q000378:metabolism; D016466:CHO Cells; D002460:Cell Line; D002843:Chromatin / Q000378:metabolism*; D033481:Chromosomes, Mammalian / Q000378:metabolism; D017124:Conserved Sequence; D006224:Cricetinae; D003412:Cricetulus; D044127:Epigenesis, Genetic; D050989:GATA2 Transcription Factor / Q000378:metabolism; D006410:Hematopoiesis / Q000235:genetics*; D051379:Mice; D008969:Molecular Sequence Data; D012045:Regulatory Sequences, Nucleic Acid / Q000235:genetics; D014158:Transcription, Genetic
chemical_list: D051792:Basic Helix-Loop-Helix Proteins; D002843:Chromatin; D050989:GATA2 Transcription Factor
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