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. 1985 Nov;56(2):639–643. doi: 10.1128/jvi.56.2.639-643.1985

Neurotropic Cas-BR-E murine leukemia virus harbors several determinants of leukemogenicity mapping in different regions of the genome.

P Jolicoeur, L DesGroseillers
PMCID: PMC252625  PMID: 2997484

Abstract

The infectious virus derived from the molecularly cloned genome of the neurotropic ecotropic murine Cas-BR-E retrovirus was previously shown to have retained the ability to induce hind-limb paralysis and leukemia when inoculated into susceptible mice (P. Jolicoeur, N. Nicolaiew, L. DesGroseillers, and E. Rassart, J. Virol. 45:1159-1163, 1983). To map the viral sequences encoding the leukemogenic determinant(s) of this virus, we used chimeric viral genomes constructed in vitro between cloned viral DNAs from the leukemogenic Cas-BR-E murine leukemia virus (MuLV) and from the related nonleukemogenic amphotropic 4070-A MuLV. Infectious chimeric MuLVs, recovered from NIH 3T3 cells microinjected with these DNAs, were inoculated into newborn NIH Swiss, SIM.S, and SWR/J mice to test their leukemogenic potential. We found that each chimeric MuLV, harboring either the long terminal repeat, the gag-pol, or the pol-env region of the Cas-BR-E MuLV genome, was leukemogenic, indicating that this virus harbors several determinants of leukemogenicity mapping in different regions of its genome. This result suggests that the amphotropic 4070-A MuLV has multiple regions along its genome which prevent the expression of its leukemogenic phenotype, and it also shows that substitution of only one of these regions for Cas-BR-E MuLV sequences is sufficient to make it leukemogenic.

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Selected References

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