Adenovirus Mutants with DNA Sequence Perturbations in the Intragenic Promoter of VAI RNA Gene Allow the Enhanced Transcription of VAII RNA Gene in HeLa Cells

Overview

Journal Nucleic Acids Res

Publisher Oxford University Press

Specialty Biochemistry

Date 1984 Oct 11

PMID 6493978

Citations 39

Authors

R A Bhat

B Thimmappaya

Affiliations

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Abstract

Ad2 VAI gene strongly competes for transcription with VAII gene in vitro. It has been suggested that this competition may be a basis for the large excess of VAI gene transcription in virus infected cells at late times. We have studied the effect of the DNA sequence perturbations of the intragenic promoter of the VAI gene on transcription of VAII gene at the level of viral chromosome. Several Ad5 mutants with mutations in the promoter of VAI gene were constructed and transcription of their VAI and VAII genes were analyzed in the infected cells. It was found that transcription of VAII gene increased dramatically when either Box A or Box B promoter sequences of VAI gene were mutated or when the entire VAI gene was replaced by a DNA segment with an unrelated DNA sequence. Thus, at late times, active transcription of VAI gene appears to partially repress transcription of VAII gene. Those mutants which synthesized large quantities of VAII RNA only grew more slowly yielding a titer which was 1/10 of that of their parent but 5 to 6 fold higher than that of an Ad5 mutant lacking both VAI and VAII genes.

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