A mouse linkage testing stock possessing multiple copies of the endogenous ecotropic murine leukemia virus genome
1989; Elsevier BV; Volume: 5; Issue: 2 Linguagem: Inglês
10.1016/0888-7543(89)90050-5
ISSN1089-8646
AutoresBenjamin A. Taylor, Lucy B. Rowe,
Tópico(s)HIV Research and Treatment
ResumoA new linkage testing stock of the laboratory mouse has been constructed. The stock, designated MEV (multiple ecotropic provvirus), was developed by inbreeding and selection beginning with the cross of strains C58J and AKXD-14. Eleven different murine leukemia virus (MuLV) proviruses have been fixed in the MEV1Ty strain. Nine of these can be uniquely identified by Southern blotting of PvuII-digested DNA and probing with a cloned fragment of the ecotropic viral genome. Two proviruses had been mapped previously to chromosome 7, while single proviruses had been mapped to chromosomes 2, 9, and 11. The mapping of six additional proviruses, derived from C58J, to chromosomes 1, 3, 5, 10, 18, and 19 is described. Another C58J provirus was mapped to chromosome 8 and proved to be identical to the previously mapped C58v-1 virus inducibility gene of strain C58Lw. Three dominant visible markers, hammer-toe (Hm), steel (Sl), and caracul-J (CaJ), located on chromosomes 5, 10, and 15, respectively, have been introduced onto the MEV genetic background by repeated backcrosses to provide additional linkage markers. It is estimated that approximately 50% of the genome can be screened by scoring 50 fully informative gametes from a linkage cross of the MEV-Hm, -Sl, -CaJ stock for the combination of viral and visible markers. A strategy for efficiently mapping new recessive visible mutations by pooling tissues for DNA extraction from mutant homozygotes among F2 progeny is described. Ways of further improving the MEV stock are discussed. The location of the Myb proto-oncogene is defined relative to Sl and one of the C58J proviruses on chromosome 10.
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