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(Received for publication, September 14, 1994; and in revised form, November 4, 1994) Erythroid Kruppel-like factor (EKLF) is an erythroid-specific
transcription factor that contains zinc finger domains similar to the
Kruppel protein of Drosophila melanogaster. Previous studies
demonstrated that EKLF binds to the CACCC box in the human
Volume 270,
Number 4,
Issue of January 27, 1995 pp. 1955-1959
©1995 by The American Society for Biochemistry and Molecular Biology, Inc.
- to
-Globin Gene
Switching
-globin
gene promoter and activates transcription. CACCC box mutations that
cause severe
-thalassemias in humans inhibit EKLF binding. Results
described in this paper suggest that EKLF functions predominately in
adult erythroid tissue. The EKLF gene is expressed at a 3-fold higher
level in adult erythroid tissue than in fetal erythroid tissue, and the
EKLF protein binds to the human
-globin promoter 8-fold more
efficiently than to the human -globin promoter. Co-transfection
experiments in the human fetal-like erythroleukemia cell line K562
demonstrate that over-expression of EKLF activates a
-globin
reporter construct 1000-fold; a linked -globin reporter is
activated only 3-fold. Mutation of the
-globin CACCC box severely
inhibits activation. These results demonstrate that EKLF is a
developmental stage-enriched protein that preferentially activates
human
-globin gene expression. The data strongly suggest that EKLF
is an important factor involved in human - to
-globin gene
switching.
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