Sequence-ready physical map of the mouse Chromosome 16 region with conserved synteny to the human Velocardiofacial syndrome region on 22q11.2

Proximal mouse Chromosome (Chr) 16 shows conserved synteny with human Chrs 16, 8, 22, and 3. The mouse Chr 16/human Chr 22 conserved synteny region in cludes the DiGeorge/Velocardiofacial syndrome region of human Chr 22q11.2. A physical map of the entire mouse Chr 16/human Chr 22 region of conserved synteny has been constructed to provide a substrate for gene discovery, gen omic sequencing, and animal model development. A YAC contig was constructed that extends ca. 5.4 Mb from a region of conserved synteny with human Chr 8 at Prkdc through the region conserved with human Chr 3 at DVL3. Sixty-one markers including 37 genes are mapped with average marker spacing of 90 kb . Physical distance was determined across the 2.6-Mb region from D16Mit74 t o Him with YAC fragmentation. The central region from D16Jhu28 to Igl-C1 wa s converted into BAC and PAC clones, further refining the physical map and providing sequence-ready template. The gene content and borders of three bl ocks of conserved linkage between human Chr 22q11.2 mouse Chr 16 are refine d.