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. 1986 May;58(2):651–654. doi: 10.1128/jvi.58.2.651-654.1986

Mapping 5' termini of JC virus early RNAs.

S Kenney, V Natarajan, G Selzer, N P Salzman
PMCID: PMC252956  PMID: 3009875

Abstract

Within its enhancer promoter region, the MAD-1 strain of JC virus (JCV) has two 98-base-pair tandem repeats, each containing a TATA box-like sequence. In the present study, polyadenylated early JCV mRNAs were isolated 5 or 29 days after infection of primary human fetal glial (PHFG) cells. By using S1 nuclease, the 5' termini of the early mRNAs were mapped to nucleotide position(s) (np) 122 through 125, which lies within an AT rich region (at np 113 through 127). In contrast, when JCV DNA was transcribed in vitro, we observed a single major cluster of 5' start sites at np 94 through 97, which is approximately 25 base pairs downstream from one of the TATA boxes. By day 5, the earliest time at which JCV RNA was detected, viral DNA replication had begun; it continued for at least an additional 20 days. Since more late than early RNA was present at 5 days postinfection, the early RNAs whose synthesis began at np 122 through 125 may be analogous to SV40 late early mRNA (Ghosh and Lebowitz, J. Virol. 40:224-240, 1981). However, we have not detected RNAs with 5' termini 25 to 30 bp downstream from the TATA box at earlier times. While JCV contains two identical TATA boxes, one in each of the 98-bp repeats, only the upstream TATA box functions as an early promoter element.

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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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