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Loss of heterozygosity (LOH) on chromosome 9q is the most frequent genetic alteration in transitional cell carcinoma (TCC) of the bladder, implicating the presence of a tumour suppressor gene or genes on 9q. To define the location of a tumour suppressor locus on 9q in TCC, we screened 156 TCCs of the bladder and upper urinary tract by detailed deletion mapping using 31 microsatellite markers on 9q. Partial deletions of 9q were found in 10 TCCs (6%), and LOH at all informative loci on 9q was found in 77 TCCs (49%). In five low grade superficial bladder tumours, the partial deletion was localized to D9S195 located at 9q32-33, with retention of heterozygosity at all other informative loci including D9S103, D9S258, D9S275 and GSN. We constructed a yeast artificial chromosome (YAC) contig covering the deleted region in these five tumours and placed another four unmapped microsatellite markers on this contig map. Using these markers, we further defined the common deleted region to the interval between D9S1848 and AFMA239XA9. The region is covered by a single YAC (852e11), whose size is estimated to be 840 kb. Our data should expedite further fine mapping and identification of the candidate tumour suppressor gene at 9q32-33.

A Novel Candidate Tumour Suppressor Locus at 9q32–33 in Bladder Cancer: Localization of the Candidate Region Within a Single 840 kb YAC