Abstract
The simian virus 40 (SV40) origin region includes the viral replication origin and the early and late promoters and consists of a few palindromes, a 17-base-pair (bp) A + T-rich sequence, three copies of a G + C-rich 21-bp repeat, and two copies of a 72-bp repeat. We have made sequential deletions in the SV40 origin region and determined the early promoter efficiencies of these truncated DNA segments by connecting them in the correct orientation with the coding regions of selectable marker genes and assaying the expression of the chimeric marker genes in vivo in different host cell lines. A truncated SV40 early promoter segment containing only the TATA box and the major in vivo mRNA initiation sites has essentially no promoter efficiency. We have located the major component of the SV40 early promoter within the 21-bp repeated sequences, which consist of an alternating and mutually overlapping array of two C-rich oligonucleotides having the consensus sequences Y-Y-C-C-G-C-C-C (Y = pyrimidine nucleoside) and G-C-C-C-(C)-TA-AT-A(T)-C-T. Between one and two copies of the 21-bp repeat were adequate for gene expression under conditions in which the enhancement effect of the 72-bp repeat was minimal. We also find that the SV40 72-bp repeat exhibits a pronounced host range in its enhancement of gene expression; the enhancement is only 2-fold in the nonpermissive mouse cells but amounts to 10- or 20-fold in the permissive monkey cells or the semipermissive human cells, respectively.
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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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