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Background  Forward genetic screens in mice provide an unbiased means to identify genes and other functional genetic elements in the genome. Previously, a large scale ENU mutagenesis screen was conducted to query the functional content of a ~50 Mb region of the mouse genome on proximal Chr 5. The majority of phenotypic mutants recovered were embryonic lethals.    Results  We report the high resolution genetic mapping, complementation analyses, and positional cloning of mutations in the target region. The collection of identified alleles include several with known or presumed functions for which no mutant models have been reported ( Tbc1d14 ,  Nol14 ,  Tyms ,  Cad ,  Fbxl5 ,  Haus3 ), and mutations in genes we or others previously reported ( Tapt1 ,  Rest ,  Ugdh ,  Paxip1 ,  Hmx1, Otoe, Nsun7 ). We also confirmed the causative nature of a homeotic mutation with a targeted allele, mapped a lethal mutation to a large gene desert, and localized a spermiogenesis mutation to a region in which no annotated genes have coding mutations. The mutation in  Tbc1d14  provides the first implication of a critical developmental role for RAB-GAP-mediated protein transport in early embryogenesis.    Conclusion  This collection of alleles contributes to the goal of assigning biological functions to all known genes, as well as identifying novel functional elements that would be missed by reverse genetic approaches.

High resolution mapping and positional cloning of ENU-induced mutations in the Rw region of mouse chromosome 5