Eucaryotic chromosome transfer: production of a murine-specific cosmid library from a neor-linked fragment of murine chromosome 17

We recently developed a procedure for the molecular analysis of specific mammalian chromosomal fragments. This procedure allows for the transfer of contiguous chromosomal fragments, varying in size from a fraction to several centimorgans in length, from the donor cell of one species into a recipient cell of a different species. Specifically, we inserted a neor gene, encoded by a recombinant retrovirus, into the murine major histocompatibility complex (MHC). Metaphase chromosome transfers with this neor-tagged chromosome into recipient hamster, primate, and canine fibroblasts produced a panel of primary neor transferents, each containing a portion of, or all of, the murine MHC. A cosmid library was made from one such transferent, CHMD(D)B1. Cosmid clones were divided, using species-specific repeat probes, into those containing murine (donor) DNA sequences and those containing sequences derived from the recipient cell. The murine-specific cosmids were clustered into overlapping DNA segments by restriction enzyme digest analysis of the cosmid DNAs coupled with Southern blot analysis with, as probes, murine-specific repeat sequences and nick-translated murine genomic DNA. These cosmid clusters were analyzed for their position within or outside of the MHC, using recombinant mouse strains, and for the presence within them of known murine MHC genes.

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