The promoter of the salmon insulin-like growth factor I gene is activated by hepatocyte nuclear factor 1.
Hepatocyte nuclear factor 1 (HNF-1) was found to have a potent stimulatory action on the activity of the promoter of the salmon insulin-like growth factor I (IGF-I) gene in transient transfection experiments. This liver-enriched transcription factor was shown to bind to an element in the proximal region of the promoter with distinct nucleotide sequence homology to the HNF-1 consensus binding sequence. Mutating this sequence to a variant no longer capable of HNF-1 binding resulted in the loss of the stimulatory effect. Since the sequence of the HNF-1 binding site is conserved in all mammalian, avian, and amphibian species from which the IGF-I promoter sequences have been derived to date, we propose that HNF-1 may be an important regulator of IGF-I gene expression in all of these species.
Kulik
V P
VP
Department of Biosynthesis of Nucleic Acids, Ukrainian Academy of Sciences, Kiev.
Kavsan
V M
VM
van Schaik
F M
FM
Nolten
L A
LA
Steenbergh
P H
PH
Sussenbach
J S
JS
D000818:Animals; D001483:Base Sequence; D002460:Cell Line; D004247:DNA; D004268:DNA-Binding Proteins; D051537:Hepatocyte Nuclear Factor 1; D051538:Hepatocyte Nuclear Factor 1-alpha; D051539:Hepatocyte Nuclear Factor 1-beta; D006801:Humans; D007334:Insulin-Like Growth Factor I / Q000235:genetics*; D008969:Molecular Sequence Data; D009154:Mutation; D009687:Nuclear Proteins; D011401:Promoter Regions, Genetic; D011485:Protein Binding; D012474:Salmon; D014157:Transcription Factors / Q000494:pharmacology*; D015533:Transcriptional Activation; D014162:Transfection; D014407:Tumor Cells, Cultured
D004268:DNA-Binding Proteins; C496487:HNF1A protein, human; C496495:HNF1B protein, human; D051538:Hepatocyte Nuclear Factor 1-alpha; D009687:Nuclear Proteins; D014157:Transcription Factors; D051537:Hepatocyte Nuclear Factor 1; D051539:Hepatocyte Nuclear Factor 1-beta; D007334:Insulin-Like Growth Factor I; D004247:DNA