The mouse gene for hypoxia-inducible factor-1alpha--genomic organization, expression and characterization of an alternative first exon and 5' flanking sequence.
The ubiquitously expressed hypoxia-inducible factor-1 (HIF-1) is involved in expression of a large number of oxygen-regulated genes. HIF-1 is a heterodimer consisting of an alpha and a beta subunit, both belonging to the basic-helix-loop-helix Per-aryl hydrocarbon receptor nuclear translocator-Sim (PAS) family of transcription factors. Whereas HIF-1alpha is a novel member of this family, HIF-1beta is identical to the aryl hydrocarbon receptor nuclear translocator, previously recognized to be involved in xenobiotic metabolism. cDNA cloning revealed that mouse HIF-1alpha can be expressed as two mRNA isoforms containing alternative 5' untranslated regions and two different predicted translational start sites. We cloned and characterized 20.5 kb of the mouse HIF-1alpha gene (Hif1a) containing exon II-XV. The two alternative first exons, I.1 and I.2, are separated from exon II by approximately 24 kb and 17 kb, respectively. We also sequenced Hif1a exon I.1 and flanking regions, and mapped a single exon I.1 transcription initiation site. Reverse transcription PCR analysis of total RNA derived from normoxic and hypoxic mouse hepatoma and fibroblast cell lines suggested that the two alternative mRNA isoforms are constitutively coexpressed in these cells, and that two different promoters drive transcription of HIF-1alpha. A minimal exon I.1 promoter was identified which moderately activated heterologous gene expression, indicating that additional cis-elements are required for efficient HIF-1alpha transcription in vivo.
Wenger
R H
RH
Institute of Physiology, University of Zürich-Irchel, Switzerland.
Rolfs
A
A
Kvietikova
I
I
Spielmann
P
P
Zimmermann
D R
DR
Gassmann
M
M
D000818:Animals; D001483:Base Sequence; D051792:Basic Helix-Loop-Helix Proteins; D001665:Binding Sites; D015687:Cell Hypoxia; D002460:Cell Line; D003001:Cloning, Molecular; D018076:DNA, Complementary / Q000737:chemistry; D004268:DNA-Binding Proteins / Q000737:chemistry / Q000235:genetics*; D029721:Drosophila Proteins; D004742:Enhancer Elements, Genetic; D005091:Exons / Q000235:genetics; D005786:Gene Expression Regulation; D017930:Genes, Reporter; D018257:Helix-Loop-Helix Motifs / Q000235:genetics; D051793:Hypoxia-Inducible Factor 1; D051795:Hypoxia-Inducible Factor 1, alpha Subunit; D051379:Mice; D008969:Molecular Sequence Data; D009687:Nuclear Proteins / Q000737:chemistry / Q000235:genetics*; D011401:Promoter Regions, Genetic / Q000235:genetics; D012326:RNA Splicing / Q000235:genetics; D012333:RNA, Messenger / Q000737:chemistry; D017422:Sequence Analysis, DNA; D015719:Single-Strand Specific DNA and RNA Endonucleases / Q000378:metabolism; D014157:Transcription Factors / Q000737:chemistry / Q000235:genetics*; D014407:Tumor Cells, Cultured
D051792:Basic Helix-Loop-Helix Proteins; D018076:DNA, Complementary; D004268:DNA-Binding Proteins; D029721:Drosophila Proteins; D051793:Hypoxia-Inducible Factor 1; D051795:Hypoxia-Inducible Factor 1, alpha Subunit; D009687:Nuclear Proteins; D012333:RNA, Messenger; D015719:Single-Strand Specific DNA and RNA Endonucleases; D014157:Transcription Factors; C497443:Hif1a protein, mouse; C089449:sim protein, Drosophila