A 2.5-Mb transcript map of a tumor-suppressing subchromosomal transferable fragment from 11p15.5, and isolation and sequence analysis of three novel genes.

11p15.5 is an important tumor-suppressor gene region, showing loss of heterozygosity in Wilms tumor, rhabdomyosarcoma, adrenocortical carcinoma, and lung, ovarian, and breast cancer. We previously mapped directly by genetic complementation a subtransferable fragment (STF) harboring an embryonal tumor-suppressor gene and spanning about 2.5 Mb. We have now mapped the centromeric end of this STF between D11S988 and D11S12 and its telomeric end between D11S1318 and TH. We have isolated a complete contig of PAC, P1, BAC, and cosmid genomic clones spanning the entire 2.5-Mb region defined by this STF, as well as more than 200 exons from these genomic clones using exon trapping. We have isolated genes in this region by directly screening DNA libraries as well as by database searching for ESTs. Nine of these genes have been reported previously by us and by others. However, the initial mapping of most of those genes was based on FISH or somatic cell hybrid analysis, and here we precisely define their physical location. These genes include RRM1, GOK (D11S4896E), Nup98, CARS, hNAP2 (NAP1L4), p57KIP2 (CDKN1C), KVLQT1 (KCNA9), TAPA-1, and ASCL2. In addition, we have identified several novel genes in this region, three of which, termed TSSC1, TSSC2, and TSSC3, are reported here. TSSC1 shows homology to Rb-associated protein p48 and chromatin assembly factor CAF1, and it is located between GOK and Nup98. TSSC2 is homologous to Caenorhabditis elegans beta-mannosyl transferase, and it lies between Nup98 and CARS. TSSC3 shows homology to mouse TDAG51, which is implicated in FasL-mediated apoptosis, and it is located between hNAP2 and p57KIP2. Thus, these genes may play a role in malignancies that involve this region.

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