We have performed a high-resolution linkage analysis for the conserved segment on distal mouse Chromosome (Chr) 8 that is homologous to human Chr 16q. The interspecific backcross used involved M. m. molossinus and an M. m. domesticus line congenic for an M. spretus segment from Chr 8 flanked by phe-notypic markers Os (oligosyndactyly) and e, a coat colormarker. From a total of 682 N2 progeny, the 191 animals revealing a recombination event between these phenotypic markers were typed for 23 internal loci. The following locus order with distances in cM was obtained: (centromere)-Os-4.1-Mmp2-0.2-Ces1,Es1, Es22-1.2-Mt1,D8Mitl5-2.2-Got2, D8Mit11-3.7-Es30-0.3-Es2, Es7-0.9-Ctral,Lcat-0.3-Cdh1, Cadp, Nmor1, D8Mit12-0.2-Mov34-2.5-Hp, Tat-0.2-Zfp4-1.6-Zfpl,Ctrb-10.9-e. In a separate interspecific cross involving 62 meioses, Dpep1 was mapped together with Aprt and Cdh3 at 12.9 cM distal to Hp, Tat, to the vicinity of e. Our data give locus order for markers not previously resolved, add Mmp2 and Dpepl as new markers on mouse Chr 8, and indicate that Ctral is the mouse homolog for human CTRL. Comparison of the order of 17 mouse loci with that of their human homologs reveals that locus order is well conserved and that the conserved segment in the human apparently spans the whole long arm of Chr 16.
Mammalian Genome – Springer Journals
Published: Mar 23, 2009
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