Coregulator-dependent facilitation of chromatin occupancy by GATA-1.
Coregulator recruitment by DNA-bound factors results in chromatin modification and protein-protein interactions, which regulate transcription. However, the mechanism by which the Friend of GATA (FOG) coregulator mediates GATA factor-dependent transcription is unknown. We showed previously that GATA-1 replaces GATA-2 at an upstream region of the GATA-2 locus, and that this GATA switch represses GATA-2. Genetic complementation analysis in FOG-1-null hematopoietic precursors revealed that FOG-1 is not required for establishment or maintenance of the active GATA-2 domain, but is critical for the GATA switch. Analysis of GATA factor binding to additional loci also revealed FOG-1-dependent GATA switches. Thus, FOG-1 facilitates chromatin occupancy by GATA-1 at sites bound by GATA-2. We propose that FOG-1 is a prototype of a new class of coregulators termed chromatin occupancy facilitators, which confer coregulation in certain contexts via enhancing trans-acting factor binding to chromatin in vivo.[1]References
- Coregulator-dependent facilitation of chromatin occupancy by GATA-1. Pal, S., Cantor, A.B., Johnson, K.D., Moran, T.B., Boyer, M.E., Orkin, S.H., Bresnick, E.H. Proc. Natl. Acad. Sci. U.S.A. (2004) [Pubmed]
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