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J Biol Chem, Vol. 273, Issue 40, 26042-26051, October 2, 1998
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From the Two mRNA species were observed for the
Drosophila E2F (dE2F) gene, differing with
regard to the first exons (exon 1-a and exon 1-b), which were expressed
differently during development. A single transcription initiation site
for mRNA containing exon 1-b was mapped by primer extension
analysis and numbered +1. We found three tandemly aligned sequences,
similar to the DNA replication-related element (DRE; 5'-TATCGATA),
which is commonly required for transcription of genes related to DNA
replication and cell proliferation, in the region upstream of this
site. Band mobility shift analyses using oligonucleotides containing
the DRE-related sequences with or without various base substitutions
revealed that two out of three DRE-related sequences are especially
important for binding to the DRE-binding factor (DREF). On footprinting
analysis with Kc cell nuclear extracts and a glutathione
S-transferase fusion protein with the N-terminal fragment
(1-125 amino acid residues) of DREF, all three DRE-related sequences
were found to be protected. Transient luciferase expression assays in
Kc cells demonstrated that the region containing the three DRE-related
sequences is required for high promoter activity. We have established
transgenic lines of Drosophila in which ectopic expression
of DREF was targeted to the eye imaginal disc cells. Overexpression of
DREF in eye imaginal disc cells enhanced the promoter activity of
dE2F. The obtained results indicate that the DRE/DREF
system activates transcription of the dE2F gene.
Laboratory of Cell Biology,
Mitsubishi Kasei
Institute of Life Sciences,
Copyright © 1998 by The American Society for Biochemistry and Molecular Biology, Inc.
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