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Hoffmann, R. A wiki for the life sciences where authorship matters. Nature Genetics (2008)

Deletion map of the coloboma (Cm) locus on mouse chromosome 2.

The extent of the semidominant coloboma (Cm) mutation on mouse Chromosome 2 was determined by deletion mapping using interspecific hybrid mice. The Cm deletion mutation results in ophthalmic dysmorphology and behavioral deficits, including profound hyperactivity, and has been shown to encompass the gene Snap. In addition to Snap, the gene encoding phospholipase C beta-1 (Plcb-1), which maps 0.60 +/- 0.60 cM proximal to Snap, and simple sequence repeat (SSR) loci D2Mit19, D2Mit46, D2Mit28, and D2Mit136 were shown to be deleted at the Cm locus. In contrast, analysis of other closely linked SSRs and genes either proximal (Bmp-2a) or distal (Nec-1) to Snap, as well as a complementation test with the closely linked mutation lethal milk (lm), indicates that these gene sequences are unaffected by the Cm mutation. These data demonstrate that the Cm deletion represents a contiguous gene defect encompassing 1.1 to 2.2 cM that may be probed for genes, both in the mouse and in the syntenic region of human Chr 20, that independently affect elements of neurological behavior and eye development.[1]


  1. Deletion map of the coloboma (Cm) locus on mouse chromosome 2. Hess, E.J., Collins, K.A., Copeland, N.G., Jenkins, N.A., Wilson, M.C. Genomics (1994) [Pubmed]
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