Functional activity of HERV-K-T47D-related long terminal repeats
The human genome contains a family of endogenous retroviruses, HERV-K(HML-4), that comprises the full-length provirus HERV-K-T47D, five related elements, and hundreds of solitary long terminal repeats (LTRs). We here show that HERV-K-T47D-related LTRs are dispersed over all human chromosomes and hav...
Gespeichert in:
| Hauptverfasser: | , , , , |
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| Dokumenttyp: | Article (Journal) |
| Sprache: | Englisch |
| Veröffentlicht: |
2001
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| In: |
Virology
Year: 2001, Jahrgang: 283, Heft: 2, Pages: 262-272 |
| ISSN: | 1096-0341 |
| DOI: | 10.1006/viro.2001.0898 |
| Online-Zugang: | Verlag, lizenzpflichtig, Volltext: https://doi.org/10.1006/viro.2001.0898 Verlag, lizenzpflichtig, Volltext: https://www.sciencedirect.com/science/article/pii/S0042682201908980 
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| Verfasserangaben: | Corinna Baust, Wolfgang Seifarth, Ulrike Schön, Rüdiger Hehlmann, and Christine Leib-Mösch |
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| 520 | |a The human genome contains a family of endogenous retroviruses, HERV-K(HML-4), that comprises the full-length provirus HERV-K-T47D, five related elements, and hundreds of solitary long terminal repeats (LTRs). We here show that HERV-K-T47D-related LTRs are dispersed over all human chromosomes and have arisen after the divergence of Old and New World monkeys. By screening a cDNA library derived from the human mammary carcinoma cell line T47D with a HERV-K-T47D LTR probe, we isolated several clones containing LTR/cellular gene chimeras and assessed the transcriptional activity of these LTRs in transient transfection experiments. All LTRs were able to drive the expression of a reporter gene, thereby displaying distinct activities in different cell lines. We found that sequences located downstream of the LTR-U3 region modulate the level of gene expression. Based on the impact of the R region we distinguished between three different LTR types; the activity of type I LTRs was enhanced in the presence of the LTR-R region in all cell lines tested, whereas a type II LTR was downregulated. Type III LTRs are characterized by lacking or having a varying influence of the R region that was dependent on the cell line used. Finally, our results attribute to LTR-U5-gag sequences a role in determining LTR activity. | ||
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