RESUMO
Whole-genome radiation hybrids have been used to construct human genome maps that integrate different types of markers. To investigate this methodology in mammalian species other than humans, a panel of 164 mouse x hamster whole-genome radiation hybrids was constructed. This set of hybrids was used to produce a high-resolution map of a region on MMU11 that included microsatellite markers and cDNA sequences. The mouse homologue of the human SRY-related gene SOX9 was mapped to an interval of approximately 1.1 cM flanked by the microsatellite markers D11Mit11 and D11Mit291. This interval includes the region containing the mouse Tail-short mutation, a possible homologue of the human syndrome campomelic dysplasia, which is caused by mutations in SOX9. Our results suggest that whole-genome radiation hybrid technology will be a useful adjunct to mapping the genomes of nonhuman mammalian species.
Assuntos
Mapeamento Cromossômico , Genoma , Camundongos/genética , Animais , Sequência de Bases , Cricetinae , Primers do DNA , DNA Satélite , Marcadores Genéticos , Proteínas de Grupo de Alta Mobilidade/genética , Humanos , Células Híbridas/efeitos da radiação , Masculino , Camundongos Mutantes , Dados de Sequência Molecular , Reação em Cadeia da Polimerase , Fatores de Transcrição SOX9 , Diferenciação Sexual , Células-Tronco/efeitos da radiação , Fatores de Transcrição/genéticaRESUMO
We have constructed a whole genome radiation hybrid (WG-RH) map across a region of human chromosome 17q, from growth hormone (GH) to thymidine kinase (TK). A panel of 128 WG-RH hybrid cell lines generated by X-irradiation and fusion has been tested for the retention of 39 sequence-tagged site (STS) markers by the polymerase chain reaction. This genome mapping technique has allowed the integration of existing VNTR and microsatellite markers with additional new markers and existing STS markers previously mapped to this region by other means. The WG-RH map includes eight expressed sequence tag (EST) and three anonymous markers developed for this study, together with 23 anonymous microsatellites and five existing ESTs. Analysis of these data resulted in a high-density comprehensive map across this region of the genome. A subset of these markers has been used to produce a framework map consisting of 20 loci ordered with odds greater than 1000:1. The markers are of sufficient density to build a YAC contig across this region based on marker content. We have developed sequence tags for both ends of a 2.1-Mb YAC and mapped these using the WG-RH panel, allowing a direct comparison of cRay6000 to physical distance.
