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Human Molecular Genetics, Vol 5, 1631-1636, Copyright © 1996 by Oxford University Press

ARTICLES

A high resolution CEPH crossover mapping panel and integrated map of chromosome 11

PR Fain, EN Kort, C Yousry, MR James and M Litt
Department of Medicine, University of Colorado Health Sciences Center, Denver 80262, USA.

High resolution (0.1 cM) CEPH crossover mapping panels were constructed for chromosome 11. These panels will facilitate a transition from top- down physical and genetic mapping strategies to integrated breakpoint mapping strategies. Novel methods, which differ from other methods in overcoming the limitations of incomplete heterozygosity and variable marker density, were developed for creating the panels and integrated maps. This made it possible to identify and sublocalize the majority of crossovers in 61 families. The panels were used to map 139 microsatellite markers. A semi-integrated map and a fully-integrated map were constructed by combining these data with data from CEPH 7.1 and then integrating data from the radiation hybrid (RH) map. Genetic lengths estimated from the mapping panels were similar to the estimates obtained when all recombinant and non-recombinant offspring were included (189.4 cM in females and 126.1 cM in males), indicating that genetic distances are stable at this high marker density. The maps have a cM density of 0.62. The distance between ordered markers is 1.39-2.92 cM depending on the criterion for order and the extent of map integration. The 2D maps provide the resolution and flexibility needed to enhance current applications such as positional cloning and mapping complex disorders; while the mapping panels will greatly improve the resolution, reliability and efficiency of future genetic mapping.
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