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. 1984 Oct;4(10):2128–2135. doi: 10.1128/mcb.4.10.2128

The long terminal repeat of an endogenous intracisternal A-particle gene functions as a promoter when introduced into eucaryotic cells by transfection.

K K Lueders, J W Fewell, E L Kuff, T Koch
PMCID: PMC369031  PMID: 6095042

Abstract

We describe experiments designed to determine whether an endogenous intracisternal A-particle (IAP) gene randomly selected from a mouse embryo library has the potential to be transcriptionally active. Assays for IAP gene transcription were done with permanently transformed rat cells and transiently transfected monkey and mouse cells. The rat cells, which had integrated IAP gene copies, contained IAP RNA. A start site within the IAP 5' long terminal repeat (LTR) was localized by S1 mapping. The promoter activity of the IAP LTR was also measured in cells 48 h after the introduction of recombinant plasmids in which bacterial chloramphenicol acetyl transferase (CAT) encoding sequences were under the control of the LTR. The IAP LTR promoted CAT activity in mouse and monkey cells. In mouse L-cells, the levels of CAT activity were 10 to 25% of those promoted by an analogous recombinant containing the Moloney murine sarcoma virus LTR as the promoter. In contrast to the Moloney murine sarcoma virus LTR, the IAP LTR was five- to eightfold more active in monkey cells than in mouse cells. The 5' and 3' LTRs were equally active, and promoter activity was dependent on having the orientation of the LTRs with respect to the CAT gene the same as their orientation with respect to the IAP gene. A 5'-flanking sequence containing a member of the highly repetitive R-sequence family increased CAT activity in COS cells 11-fold when present along with the LTR. Our results indicate that the LTR of an endogenous mouse IAP gene can function as an efficient promoter in heterologous as well as homologous cells.

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Selected References

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