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. 1979 Apr;76(4):1938–1942. doi: 10.1073/pnas.76.4.1938

Germ line integration of Moloney leukemia virus: Identification of the chromosomal integration site

Michael Breindl *, Johannes Doehmer †, Klaus Willecke †, Jessica Dausman *, Rudolf Jaenisch *
PMCID: PMC383508  PMID: 287034

Abstract

The chromosomal integration site of the structural gene of Moloney murine leukemia virus (M-MuLV) in the genome of BALB/Mo mice was mapped genetically. These mice transmit the exogenous M-MuLV as an endogenous virus at a single Mendelian locus. Two independent experimental approaches were used: (i) Non-virus-producing fibroblasts prepared from homozygous BALB/Mo embryos were fused to Chinese hamster Wg3-h-o cells. In an analysis of 30 independent mouse-Chinese hamster cell hybrid clones, the segregation of the viral genome measured by molecular hybridization and enzymes assigned to 16 different mouse chromosomes were compared. We found a highly concordant segregation of M-MuLV sequences and the mouse enzyme triosephosphate isomerase (TPI, EC 5.3.1.1), whose gene has been assigned to chromosome 6. A further karyotype analysis of 9 clones, in which the chromosomes were identified cytochemically, supported this result. (ii) The segregation of the viral genome was studied in backcrosses of BALB/Mo with ABP/J mice. In the backcross ABP/J×(ABP/J×BALB/Mo) a linkage of the M-MuLV genome to the morphological marker wa-1 on mouse chromosome 6 was found. This confirmed the conclusion that the M-MuLV genome is integrated in mouse chromosome 6. These experiments define the genetic locus Mov-1, denoting the genetically transmitted structural gene of M-MuLV in BALB/Mo mice.

Keywords: genetic transmission, structural gene, segregation analysis, somatic cell hybrids, backcross animals

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Selected References

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