W N Frankel — Page 5 | PubMed Health

PubMed1989

Effect of proviral insertion on transcription of the murine B2mb gene.

We describe three B2mb mutants caused by integration of retroviral proviruses into the B2m gene. All three insertions occurred within 500 base pairs of each other in the 5' end of the first intron of the B2mb gene. Mutant cell line i1 contained a nonfunctional Abelson murine leukemia virus-initiated transcript that spliced into B2mb exon II; mutant cell lines i7 and i18 contained transcripts complementary to B2mb exon 1. Both i1 and i7 also contained small amounts of wild-type B2mb transcript. The implications of these studies for the development of retroviral insertional mutagenesis as a strategy for cloning previously uncloned genes are discussed.

Abelson murine leukemia virus↗

PubMed1989

Genetic identification of endogenous polytropic proviruses by using recombinant inbred mice.

Forty-seven endogenous polytropic murine viruses (Pmv) were identified by examination of proviral-cellular DNA junction fragment segregation in recombinant inbred (RI) mice. Most Pmv loci were found in more than one of the seven RI progenitor strains analyzed, but only four were present in all strains. Chromosomal assignments for 41 Pmv loci were determined by comparing their RI strain distribution patterns with those of known genetic markers. Pmv loci were found dispersed throughout the genome, with chromosomes 1, 3, 4, 5, 7, 11, 12, 15, and 16 each carrying three or more proviruses. Linkage analysis in the AKXD RI set suggested that the gene encoding mink cell focus-forming virus resistance (Rcmfr) of DBA/2J mice is probably not a Pmv provirus. It was also deduced that no single, AKR/J-specific Pmv provirus is required as an env gene donor for thymomagenic mink cell focus-forming viruses. In addition, a Pmv provirus was very closely associated with the albino mutation on chromosome 7.

Animals↗