Differential transcription inducibility by interferon of the HLA-A3 and HLA-B7 class-I genes

✍ Scribed by Razqallah Hakem; Anne Jezo-Brémond; Philippe le Bouteiller; Katherine Harper; François A. Lemonnier

• Publisher: John Wiley and Sons
• Year: 1991
• Tongue: French
• Weight: 680 KB
• Volume: 47
• Category: Article
• ISSN: 0020-7136
• DOI: 10.1002/ijc.2910470703

✦ Synopsis

HLA-A3 and HLA-B7 class-I genes are differentially regulated in human T lymphoma Jurkat cells, at the trancriptional level, the expression of the HLA-B7 gene being selectively increased following a, p or y interferon (IFN) treatment. Using a series of hybrid CAT constructs, associating HLA-A3 and HLA-67 complete or fragmented promoters, the differential regulation was shown to be associated with 2 nucleotide differences at positions -I76 and -I75 in the interferon regulatory sequence (IRS) of the HLA-A3 and the HLA-B7 genes. Replacement, using site-directed mutagenesis, of the 2 thymidine in the HLA-A3-IRS by adenine and cytidine found at the same positions in the HLA-B7-IRS was sufficient to restore IFN inducibility of the HLA-A3 promotor and efficient interaction with HeLa nuclear factors. Since the same nucleotide differences are shared by all sequenced HLA-A and HLA-6 class-I genes, the differential induction by IFN of the transcription of the HLA-A3 and B7 genes might be a general locus-related property.