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Mouse Hypoxia-Inducible Factor-1 Is Encoded by Two Different mRNA
Isoforms: Expression From a Tissue-Specific and a Housekeeping-Type
Promoter
Roland H. Wenger,
Andreas Rolfs,
Patrick Spielmann,
Dieter R. Zimmermann, and
Max Gassmann
From the Institute of Physiology, University of Zürich-Irchel,
Zürich; and the Department of Pathology, University of
Zürich, Zürich, Switzerland.
Hypoxic induction of erythropoietin (Epo) and other oxygen-dependent
genes is mediated by the hypoxia-inducible factor-1 (HIF-1), a
heterodimeric transactivator consisting of an and a subunit. We
previously found that the mouse gene encoding HIF-1 harbors two
alternative first exons (I.1 and I.2), giving rise to two different
HIF-1 mRNA isoforms. Here, we show by RNase
protection analysis that the exon I.1-derived mRNA isoform is
differentially expressed in mouse tissues, being highest in kidney,
tongue, stomach, and testis, but undetectable in liver, whereas the
exon I.2 mRNA isoform is ubiquitously expressed. Sequence and
methylation analysis showed that, in contrast to exon I.1, exon I.2
resides within a region showing typical features of a CpG island, known
to be associated with the 5 end of housekeeping genes. We
identified a 232-bp minimal exon I.2 promoter that strongly induced
reporter gene expression in mouse L929 fibroblasts and Hepa1 hepatoma
cells. In contrast to L929 cells, the exon I.1 promoter was inactive in
Hepa1 cells and hypoxic exposure (1% O2) markedly reduced
exon I.2 promoter activity in Hepa1 cells. Prolonged exposure of mice to hypoxia (7.5% O2 for up to 72 hours) also caused a
decrease in liver HIF-1 mRNA, whereas aldolase mRNA levels
increased. These findings might be related to the relatively low Epo
levels in the adult liver.
Blood, Vol. 91 No. 9 (May 1), 1998:
pp. 3471-3480
© 1998 by The American Society of Hematology.

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