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Nucleic Acids Res. Feb 25, 1990; 18(4): 937–947.
PMCID: PMC330348

Intervening sequences increase efficiency of RNA 3' processing and accumulation of cytoplasmic RNA.

Abstract

Two expression vectors were constructed that differ only in the presence (+) or absence (-) of an intervening sequence (IVS) in their 5'-untranslated leaders. Transient transfection into four mammalian cell lines resulted in higher levels of the indicator protein (CAT) from the IVS(+) vector (6 to 50-fold). Cytoplasmic RNA concentrations in 293s and HeLa cell lines corresponded directly to resultant protein levels; measurements in 293s cells of transcription initiation and elongation, steady-state total nuclear RNA, and cytoplasmic RNA stability, were equivalent for the two vectors. Surprisingly, the amount of poly(A)+ nuclear RNA was greater from the IVS(+) vector. Since this difference matches the ratio seen with polyadenylated cytoplasmic RNA, our results imply that splicing is coupled to a polyadenylation/transport pathway.

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Selected References

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