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  • Title: A locus that enhances the induction of endogenous ecotropic murine leukemia viruses is distinct from genome-length ecotropic proviruses.
    Author: Horowitz JM, Risser R.
    Journal: J Virol; 1982 Dec; 44(3):950-7. PubMed ID: 6294342.
    Abstract:
    The segregation of genes that enhance the induction of ecotropic murine leukemia viruses (In loci) has been compared with the segregation of ecotropic-specific nucleotide sequences in 12 low-leukemic mouse strains and 18 recombinant inbred strains. Endogenous ecotropic viruses of these strains are of genome length and structurally similar to AKR ecotropic proviruses. Low-leukemic strains of related pedigree contain ecotropic proviruses at common integration sites. Loci previously identified which enhance induction of ecotropic viruses (In genes) were correlated with the inheritance of ecotropic viral sequences in inbred low-leukemic mouse strains and in CXB recombinant inbred mouse strains. However, four BXH recombinant inbred strains were observed to possess an In gene(s) yet lack the probed envelope gene region for the corresponding endogenous ecotropic virus. These observations indicate that at least one gene that enhances ecotropic virus expression in vitro is encoded by DNA sequences outside ecotropic proviruses or by subgenomic viral sequences.
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