Identification of sequences responsible for positive and negative regulation by E1A in the promoter of H-2Kbm1 class I MHC gene - PubMed

Identification of sequences responsible for positive and negative regulation by E1A in the promoter of H-2Kbm1 class I MHC gene

S Katoh et al. EMBO J. 1990 Jan.

Abstract

The mechanism of transcriptional regulation of the H-2Kbm1 major histocompatibility complex (MHC) class I gene by adenovirus type 12 E1A (Ad12-E1A) was studied in transfected rat embryonal fibroblasts. Results of long-term expression of the chloramphenicol acetyl transferase (CAT) gene placed under the control of the 5'-flanking region of the mouse MHC class I gene. H-2Kbm1, and the results of nuclear run-on transcription assays, yield evidence for both positive and negative regulation of H-2Kbm1 by E1A gene product. Deletion studies in the H-2Kbm1 promoter region revealed that a proximal 58 bp upstream sequence (-194 to -136, relative to the cap site) and a distal 316 bp sequence (-1837 to -1521) respectively contribute to positive and negative regulation mediated by the E1A gene product. Both regulatory elements of MHC class I gene promoter region are responsible for the differential expression of the H-2Kbm1 gene in Ad12 transformed cells. A nuclear factor binding to the negative element has been detected only in extracts derived from cells expressing Ad12-E1A.

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