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J Biol Chem, Vol. 273, Issue 6, 3625-3634, February 6, 1998
From the Transcription factor GATA-2 has been shown to be
a key regulator in hematopoietic progenitor cells. To elucidate how the
expression of the GATA-2 gene is controlled, we isolated the
mouse GATA-2 (mGATA-2) gene. Transcription of mGATA-2
mRNAs was found to initiate from two distinct first exons, both of
which encode entirely untranslated regions, while the remaining five
exons are shared by each of the two divergent mRNAs. Reverse
transcriptase-polymerase chain reaction analysis revealed that GATA-2
mRNA initiated at the upstream first exon (IS) in
Sca-1+/c-kit+ hematopoietic progenitor
cells, whereas mRNA that initiates at the downstream first exon
(IG) is expressed in all tissues and cell lines that express GATA-2.
While the structure of the IG exon/promoter shows high similarity to
those of the Xenopus and human GATA-2 genes, the IS
exon/promoter has not been described previously. When we examined the
regulation contributing to IS transcription using transient
transfection assays, we found that sequences lying between
Alternative Promoters Regulate Transcription of the Mouse
GATA-2 Gene
§,
,
,
,
Center for Tsukuba Advanced Research
Alliance and Institute of Basic Medical Sciences,
79 and
61 are critical for the cell type-specific activity of the IS
promoter. DNase I footprinting experiments and electrophoretic mobility
shift assays demonstrated the binding of transcription factors to this
region. These data indicate that the proximal 80 base pair region of IS
promoter is important for the generation of cell type-specific
expression of mGATA-2 from the IS exon.
Copyright © 1998 by The American Society for Biochemistry and Molecular Biology, Inc.
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