Genetics, Vol 147, 787-799, Copyright © 1997

INVESTIGATIONS

Murine Albino-Deletion Complex: High-Resolution Microsatellite Map and Genetically Anchored YAC Framework Map

B. A. Rikke, D. K. Johnson and T. E. Johnson
Institute for Behavioral Genetics, University of Colorado, Boulder, Colorado 80309-0447

The murine albino-deletion complex developed as part of the Oak Ridge specific-locus test covers 6-11 cM of chromosome 7. This complex has proven to be a valuable resource for localizing traits to a small target region suitable for positional cloning. In this study, we mapped the endpoints of deletions in this complex using all of the available Mit simple-sequence length polymorphism (SSLP) markers. Concurrently, this mapping has determined the map order of nearly all of the SSLP markers, most of which were previously unresolved. The SSLP-based deletion map was confirmed and genetic distances were determined using the European Collaborative Interspecific Backcross panel of nearly a thousand mice. The average SSLP marker resolution is 0.3-0.4 cM, comparable to the cloning capacity of yeast artificial chromosomes (YACs). The SSLP markers were then used to construct a genetically anchored YAC framework map that further confirms the deletion map. We find that the largest deleted region distal to Tyr is about two to three times larger than the largest proximal deleted region, and the original C3H/101 regions flanking the deletions (moved to an St2A c(ch)/c(ch) background) are smaller than anticipated, which we suggest may result from increased recombination rates immediately flanking the deleted regions.

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