The fit-1 locus was originally identified as a common insertion site for feline leukemia virus (FeLV) in thymic lymphosarcomas induced by FeLV-myc recombinant viruses, suggesting that it harbors a gene that cooperates with Myc in T-cell leukemogenesis. We have previously mapped the fit-1 locus to feline Chromosome (Chr) B2. We have now identified conserved sequences that allow the mapping of the murine homolog using the European Interspecific Backcross (EUCIB). This shows that fit-1 is located on mouse Chr 10, 1cM proximal to Ahi-1, a murine retroviral integration locus that is closely linked to Myb. Moreover, the physical linkage to MYB is maintained in the human genome, as shown by cloning of the human homolog of fit-1 from a Chr 6 cosmid library and a series of overlapping PAC clones. Generation of a contig map around the human homolog of fit-1 reveals that it is approximately 100-kb upstream of MYB. In addition to fit-1 and Ahi-1, two other common insertion sites, Mis-2 and Mml-1, have also been mapped adjacent to Myb on mouse Chr 10. Previous analysis of tumors carrying insertions at fit-1, Mml-1, Mis-2 and Ahi-1 showed no obvious abnormalities in Myb expression. However, the cluster of viral insertion loci in this region suggests either the presence of a closely linked activation target or that subtle effects on Myb have been overlooked.
Mammalian Genome – Springer Journals
Published: Mar 11, 2014
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