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. 1984 Dec;52(3):945–952. doi: 10.1128/jvi.52.3.945-952.1984

The tandem direct repeats within the long terminal repeat of murine leukemia viruses are the primary determinant of their leukemogenic potential.

L DesGroseillers, P Jolicoeur
PMCID: PMC254618  PMID: 6092722

Abstract

To map the viral sequences encoding the leukemogenic determinant(s) of nondefective murine leukemia viruses (MuLVs), we constructed chimeric viral genomes in vitro between cloned viral DNAs from the highly leukemogenic Gross passage A (Gross A) MuLV and from the related nonleukemogenic BALB/c N-tropic MuLV. Infectious chimeric MuLVs, recovered from murine cells microinjected with these DNAs, were inoculated into newborn mice to test the leukemogenic potential of these viruses. We found that the U3 long terminal repeat region from Gross A genomes was sufficient to confer an intermediate leukemogenic potential to chimeric MuLVs. Sequencing data indicated that the U3 tandem direct repeat was responsible for this effect. Adding most of the Gross A p15E-coding sequences to the Gross A U3 long terminal repeat enhanced the leukemogenic potential of chimeric viruses significantly. Adding a larger 3'-end env region (all p15E-coding sequences and 345 base pairs of the carboxy terminus of gp70) to the Gross A U3 long terminal repeat restored the full leukemogenic potential of Gross A MuLV. Chimeric viruses harboring only the Gross A 3'-end env region were, however, nonleukemogenic. Similar chimeric MuLVs, constructed with genomes from the parental weakly leukemogenic BALB/c B-tropic MuLVs and nonleukemogenic BALB/c N-tropic MuLVs, were also studied. Our data indicate that the U3 tandem direct repeat sequences appear to be necessary and sufficient to confer some leukemogenic potential to MuLV. However, env 3'-end sequences, mostly the p15E-encoding sequences, are required for the expression of fully leukemic phenotypes.

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Selected References

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