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. 1986 Dec;60(3):910–919. doi: 10.1128/jvi.60.3.910-919.1986

Cas-Br-E murine leukemia virus: sequencing of the paralytogenic region of its genome and derivation of specific probes to study its origin and the structure of its recombinant genomes in leukemic tissues.

E Rassart, L Nelbach, P Jolicoeur
PMCID: PMC253320  PMID: 3023680

Abstract

The ecotropic Cas-Br-E murine leukemia virus (MuLV) and its molecularly cloned derivative pBR-NE-8 MuLV are capable of inducing hind-limb paralysis and leukemia after inoculation into susceptible mice. T1 oligonucleotide fingerprinting, molecular hybridization, and restriction enzyme analysis previously showed that the env gene of Cas-Br-E MuLV diverged the most from that of other ecotropic MuLVs. To analyze proviruses in leukemic tissues, we derived DNA probes specific to Cas-Br-E sequences: two from the env region and one from the U3 long terminal repeat. With these probes, we found that this virus induced clonal (or oligoclonal) tumors and we documented the presence of typical mink cell focus-forming-type proviruses in leukemic tissues and the possible presence of other recombinant MuLV proviruses. Since the region harboring the determinant of paralysis was mapped within the pol-env region of the virus (L. DesGroseillers, M. Barrette, and P. Jolicoeur, J. Virol. 52:356-363, 1984), we performed the complete nucleotide sequence of this region covering the 3' end of the genome. We compared the deduced amino acid sequences of the pol carboxy-terminal domain and of the env gene products with those of other nonparalytogenic, ecotropic, and mink cell focus-forming MuLVs. This amino acid comparison revealed that this part of the pol gene product and the p15E diverged very little from homologous proteins of other MuLVs. However, the Cas-Br-E gp70 sequence was found to be quite divergent from that of other MuLVs, and the amino acid changes were distributed all along the protein. Therefore, gp70 remains the best candidate for harboring the determinant of paralysis.

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Selected References

These references are in PubMed. This may not be the complete list of references from this article.

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