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GATA‐1 forms distinct activating and repressive complexes in erythroid cells
Author(s) -
Rodriguez Patrick,
Bonte Edgar,
Krijgsveld Jeroen,
Kolodziej Katarzyna E,
Guyot Boris,
Heck Albert JR,
Vyas Paresh,
de Boer Ernie,
Grosveld Frank,
Strouboulis John
Publication year - 2005
Publication title -
the embo journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 7.484
H-Index - 392
eISSN - 1460-2075
pISSN - 0261-4189
DOI - 10.1038/sj.emboj.7600702
Subject(s) - biology , gata2 , erythropoiesis , chromatin , haematopoiesis , microbiology and biotechnology , gene , gata1 , repressor , activator (genetics) , gata transcription factor , genetics , transcription factor , gene expression , stem cell , promoter , medicine , anemia
GATA‐1 is essential for the generation of the erythroid, megakaryocytic, eosinophilic and mast cell lineages. It acts as an activator and repressor of different target genes, for example, in erythroid cells it represses cell proliferation and early hematopoietic genes while activating erythroid genes, yet it is not clear how both of these functions are mediated. Using a biotinylation tagging/proteomics approach in erythroid cells, we describe distinct GATA‐1 interactions with the essential hematopoietic factor Gfi‐1b, the repressive MeCP1 complex and the chromatin remodeling ACF/WCRF complex, in addition to the known GATA‐1/FOG‐1 and GATA‐1/TAL‐1 complexes. Importantly, we show that FOG‐1 mediates GATA‐1 interactions with the MeCP1 complex, thus providing an explanation for the overlapping functions of these two factors in erythropoiesis. We also show that subsets of GATA‐1 gene targets are bound in vivo by distinct complexes, thus linking specific GATA‐1 partners to distinct aspects of its functions. Based on these findings, we suggest a model for the different roles of GATA‐1 in erythroid differentiation.