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Factors Influencing Eukaryotic Transcription Came From Studies Using Viruses

Decent Essays

Much of the early insight into the mechanisms regulating eukaryotic transcription came from studies using viruses. Viruses utilize the machinery of the infected cell to transcribe the viral genome and synthesize more viral particles. Therefore, in the 1970s and 1980s several groups were using viral gene systems as a convenient tool to investigate eukaryotic transcription. The members of the ATF family of transcription factors were similarly discovered in the late 1980s by researchers trying to identify cellular factor(s) involved in the coordinated regulation of a set of adenoviral genes.
At the time, it was known that transcription of adenoviral early genes (such as E1B, E2A/B, E3 and E4), requires the product of the viral immediate early gene, E1A which encodes a 289aa protein. Additionally, promoter-deletion studies had demonstrated that transcription of the early genes required a minimal cis-acting DNA region in the target promoters. However, certain observations made at the time suggested that other factors were also involved in E1A-mediated induction of these genes– 1) E1A protein did not bind to the cis-acting regions of the viral genes; and 2) the cis-acting regions in the different E1A-inducible viral gene promoters were very diverse and lacked sequence similarities denoting the binding site for a single protein (such as E1A). Thus, the underlying mechanism of E1A-inducibility of these viral genes was not clear. It was hypothesized that E1A interacted with the

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