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. 1985 May;54(2):364–373. doi: 10.1128/jvi.54.2.364-373.1985

A 1.6-kilobase-pair fragment in the genome of the ts1 mutant of Moloney murine leukemia virus TB that is associated with temperature sensitivity, nonprocessing of Pr80env, and paralytogenesis.

P H Yuen, D Malehorn, C Knupp, P K Wong
PMCID: PMC254806  PMID: 3989910

Abstract

ts1 and ts7, two temperature-sensitive mutants of Moloney murine leukemia virus strain TB induce hind-limb paralysis in 100% of CFW/D mice injected. These two paralytogenic mutants also share a defect in their inability to process the env precursor protein, Pr80env, at the restrictive temperature. To identify the mutation(s) in the genomes of the paralytogenic mutants which cause the inability to process Pr80env efficiently and confer the ability to cause hind-limb paralysis instead of lymphoma, we constructed chimeric genomes between ts1 and Moloney murine leukemia virus or the TB strain of the virus. We identified a 3.9-kilobase-pair HindIII-PstI sequence from nucleotides 4895 through 8264 and 1 through 567 of ts1, comprising the 3' end of the pol and all of the env genes, the long terminal repeat, and the 5' noncoding sequence, as being responsible for the temperature sensitivity, the inefficiency in processing Pr80env, and the induction of paralysis. We extended these findings by demonstrating that the 1.6-kilobase-pair pol-gp70 HindIII-BamHI DNA sequence from nucleotides 4895 through 6537 of ts1 within the 3.9-kilobase-pair HindIII-PstI fragment is necessary for ts1 to induce paralysis. In addition, we showed that this 1.6-kilobase-pair fragment also controls the processing of Pr80env and the temperature sensitivity of ts1.

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Selected References

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