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. 1985 May;5(5):1084–1092. doi: 10.1128/mcb.5.5.1084

Nuclei of adenovirus 2-infected cells contain an RNA species that corresponds to an intron excised intact from mRNA precursors.

R Rosenthal, H J Raskas
PMCID: PMC366825  PMID: 2987675

Abstract

We used Northern and S1 nuclease analyses to identify a nuclear RNA species of the structure predicted for an intron excised from the precursor of adenovirus 2 E2A early mRNA. The structure of this excised intron demonstrated that the splicing of E2A mRNA can involve the removal of the intron sequences as single intact molecules. The concentration of the excised intron is 30 copies per nuclei, comparable to the levels of E2A polyadenylated splicing precursors, but 30-fold less than nuclear E2A mRNA. Late in infection, when the production of E2A early mRNA is dramatically elevated (Goldenberg et al., J. Virol. 38:932-939, 1981), the excess intron was not detected, indicating that either its stability or the mechanism of splicing is altered. We also identified a spliced nonpolyadenylated E2A nuclear RNA species with a structure similar to the mRNA, indicating that splicing may normally occur in the absence of polyadenylation.

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