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. 1978 Dec;28(3):885–894. doi: 10.1128/jvi.28.3.885-894.1978

Extent of Transcription of the E Strand of Polyoma Virus DNA During the Early Phase of Productive Infection

Nicholas H Acheson 1, Françoise Miéville 1
PMCID: PMC525813  PMID: 215784

Abstract

Early polyoma virus-specific RNA, in nuclei and cytoplasm of cells labeled with [3H]uridine, was analyzed by hybridization with filter-bound Hpa II fragments of polyoma DNA. About 40% of labeled cytoplasmic virus-specific RNA hybridized with Hpa II fragment 2, which represents about 40% of the region coding for E-strand mRNA's; less than 5% hybridized with fragments 1 or 3, which lie outside this region. A somewhat lower proportion (about 30%) of labeled nuclear virus-specific RNA hybridized with fragment 2, and a small but significant fraction (7 to 14%) hybridized with fragments 1 and 3. About two-thirds of the nuclear RNA which hybridized to fragment 1 was complementary to the E strand, and one-third was complementary to the L strand. Results did not vary greatly in samples labeled for periods of from 15 min to 3 h. The major species of pulse-labeled nuclear polyoma-specific RNA sedimented at 22S and thus is slightly larger than the 19S cytoplasmic mRNA. These results show that most early nuclear RNA (∼75%) is transcribed from the region of the E strand, which codes for early mRNA's, and that there is probably a site at which transcription is terminated at the end of this region. However, a small amount of early nuclear RNA (∼15%) is transcribed from the remainder of the E strand, perhaps by readthrough of this termination signal. In addition, there is a small amount of transcription from the L strand, whose significance is unclear. Neither the L-strand transcripts nor the nonmessenger E-strand transcripts are transported to the cytoplasm.

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Selected References

These references are in PubMed. This may not be the complete list of references from this article.

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