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Function of normal and mutated gamma-globin gene promoters in
electroporated K562 erythroleukemia cells
MJ Ulrich and TJ Ley
Department of Medicine, Jewish Hospital at Washington University Medical
Center, St Louis, MO 63110.
We examined the importance of cis-acting regulatory elements of the human
gamma-globin gene promoter in a cell line (K562) where this gene normally
functions. A gamma-Globin promoter fragments were fused to the neomycin
phosphotransferase (neoR) gene in a plasmid-based vector and transiently
transfected by electroporation into K562 cells. Correctly initiated "A
gamma-neo" transcripts were detected with an S1 nuclease protection assay
that was internally controlled for transfection efficiency and RNA content.
We first optimized the conditions for electroporation, and then determined
input DNA concentrations that permitted study of gamma-promoter function in
the linear range of the assay. We discovered that a gamma-globin promoter
fragment extending from -299 to +36 (with respect to the transcription
initiation site) was active in this transient transfection assay, and that
the expression of this promoter was increased by the SV40 enhancer.
Deletion of the gamma-globin promoter to position -199 did not
significantly affect gamma-globin promoter function. However, deletion to
-160 reduced gamma promoter strength to 70% that of control, deletion to
position -130 to 19% that of control, and deletion to position -61 to 8.7%
that of control. Three gamma-globin promoters containing mutations
associated with hereditary persistence of fetal hemoglobin (-202 C----G,
-196 C----T, and -117 G----A) were not overexpressed in the K562 cell
environment, consistent with the hypothesis that these promoters are not
overexpressed in fetal erythroblasts, only adult erythroid cells. This
system will allow us to further dissect the roles of regulatory globin
cis-acting DNA elements in fetal erythroid cells.
Volume 75,
Issue 4,
pp. 990-999,
02/15/1990
Copyright © 1990 by The American Society of Hematology

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