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. 1988 Jun;62(6):2143–2149. doi: 10.1128/jvi.62.6.2143-2149.1988

Use of recombinant retroviruses to study the regulation of integrated adenovirus early promoters.

R K Strair 1, J S Miller 1, B E Roberts 1
PMCID: PMC253313  PMID: 2966866

Abstract

Adenovirus E1A gene products are capable of modulating the expression of a variety of integrated genes. To study the mechanisms by which this regulation occurs, recombinant retroviruses have been utilized to establish cell lines containing an integrated copy of either the adenovirus E2 or E3 promoter adjacent to the bacterial guanine phosphoribosyl transferase (GPT) gene. These cell lines have been characterized with respect to both basal and E1A-induced levels of GPT gene expression. Cell lines with low levels of GPT gene expression showed increased expression in the presence of E1A, whereas cell lines with high basal levels of GPT gene expression had decreased GPT RNA levels in the presence of E1A. Further characterization of these cell lines revealed E1A modulation of the accumulation of RNA initiating at a retrovirus promoter adjacent to the E2 or E3 promoter. The use of the GPT gene as a marker of E2 or E3 promoter activity has allowed the isolation of cell lines which have spontaneously increased their levels of GPT RNA. A preliminary characterization of four of these cell lines has indicated that GPT gene expression is increased as a result of cis activation of the E2 promoter.

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