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Expression of the myeloid transcription factor GATA1 is required for early stages of eosinophil differentiation. Defining mechanisms regulating eosinophil GATA1 expression will be important to understand development of this lineage. However, the cis-elements required for eosinophil GATA1 expression are not fully characterized. Previous work identified HS 1 as a major GATA1 enhancer, but its role in eosinophil GATA1 expression is unclear. Here, we show that mouse HS 1 deletion leaves eosinophil GATA1 mRNA expression and eosinophil differentiation unaffected. Chromatin isolated from eosinophils and encompassing HS 1 is weakly enriched for acetylated histones H3/H4. HS 1 deletion does not alter eosinophil GATA1 locus histone acetylation. In eosinophils, GATA1 and CCAAT/enhancer binding protein epsilon (C/EBP epsilon) do not bind HS 1 but bind selectively a cis-element in the first GATA1 intron. Thus, HS 1 is not required for eosinophil GATA1 expression. Instead, this study suggests a previously unsuspected role for the GATA1 intron element for this function.

Original publication

DOI

10.1182/blood-2004-01-0108

Type

Journal article

Journal

Blood

Publication Date

01/07/2004

Volume

104

Pages

89 - 91

Keywords

Acetylation, Animals, Blood Proteins, CCAAT-Enhancer-Binding Proteins, Cell Differentiation, Cell Line, Tumor, DNA-Binding Proteins, Enhancer Elements, Genetic, Eosinophils, Erythroid-Specific DNA-Binding Factors, Female, GATA1 Transcription Factor, Gene Deletion, Gene Expression, Hemoglobins, Histones, Interleukin-5, Leukocyte Count, Male, Megakaryocytes, Mice, Platelet Count, Transcription Factors, Transgenes