Regulation of two interferon-inducible human genes by interferon, poly(rI).poly(rC) and viruses.
The IFI-56K and IFI-54K genes are transcriptionally stimulated when cells are treated by interferon. We have previously shown that the IFI-56K gene is in addition directly induced by poly(rI).poly(rC), and inducer of interferon-beta. Since the regulation of the IFI-56K and IFI-54K genes by interferon are very much alike, we tested whether the IFI-54K gene is also directly regulated by poly(rI).poly(rC). Treatment of various cell lines with poly(rI).poly(rC) leads to a clear accumulation of the IFI-54K mRNA to a level which sometimes even exceeds that obtained with high doses of interferon. Several interferon-resistant cell lines were investigated for the inducibility of both the IFI-56K and IFI-54K genes by interferons, poly(rI).poly(rC) and viruses (which are the natural inducers of interferon-alpha and -beta). Both genes appear to be coordinately regulated by these inducers. It was thus interesting to search for common regulatory element(s) in the control region of these two genes. The IFI-54K gene promoter region was isolated, from which a 520-base-pair segment was sequenced and compared with the promoter region of the IFI-56K gene that we had previously sequenced. The only homology was found is a well conserved 19-bp segment located just upstream of the TATA box of these genes; interestingly, this sequence is also homologous to the minimal region needed for the inducibility by poly(rI).poly(rC) of the interferon-beta gene. This conserved sequence might be responsible for the coordinate induction of the IFI-56K and IFI-54K genes by interferon, poly(rI).poly(rC) and viruses.
Wathelet
M G
MG
Département de Biologie Moléculaire, Université Libre de Bruxelles, Rhode-St-Genèse, Belgium.
Clauss
I M
IM
Content
J
J
Huez
G A
GA
D001483:Base Sequence; D004247:DNA / Q000032:analysis; D005786:Gene Expression Regulation / Q000187:drug effects; D007372:Interferons / Q000096:biosynthesis / Q000494:pharmacology*; D008969:Molecular Sequence Data; D009522:Newcastle disease virus / Q000502:physiology; D011070:Poly I-C / Q000494:pharmacology*; D011401:Promoter Regions, Genetic; D012333:RNA, Messenger / Q000032:analysis / Q000096:biosynthesis; D012689:Sequence Homology, Nucleic Acid; D014721:Vesicular stomatitis Indiana virus / Q000502:physiology
D012333:RNA, Messenger; D004247:DNA; D007372:Interferons; D011070:Poly I-C