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. 1986 Feb;6(2):477–487. doi: 10.1128/mcb.6.2.477

Multiple regulatory elements in the intergenic region between the alpha-fetoprotein and albumin genes.

R Godbout, R Ingram, S M Tilghman
PMCID: PMC367536  PMID: 2431269

Abstract

Three enhancer elements spanning a distance of 7 kilobases have been found at the 5' end of the alpha-fetoprotein (AFP) gene. These elements were identified by transient expression assay after the introduction of a modified mouse AFP gene with variable amounts of 5' flanking sequence into a human hepatoma cell line, Hep G2. These regulatory elements function in a position-independent and orientation-independent manner that is typical of enhancers. All three elements will stimulate transcription from the promoter of the herpes simplex virus thymidine kinase gene. In Hep G2 cells, transcriptional activation from the heterologous promoter was approximately 25- to 50-fold higher than the basal levels obtained in the absence of AFP enhancer elements. In HeLa cells, the increase in thymidine kinase gene transcription varied from 6- to 14-fold, indicating that the enhancer elements exhibit some cell type specificity. Deletion analysis of the region proximal to the AFP transcription initiation site identified an essential region between 85 and 52 bases upstream of the site of initiation of transcription whose removal resulted in almost complete extinction of transcriptional activity. This region, which has been shown to be dispensable for transcription in HeLa cells, defines a second tissue-specific regulatory region in the gene.

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