Integrated YAC contig containing the 3pl4.2 hereditary renal carcinoma 3;8 translocation breakpoint and the fragile site FRA3B

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Abstract
An extended YAC contig has been developed for the 3p14 region containing the hereditary renal carcinoma 3;8 translocation breakpoint and the 3p 14.2 fragile site FRA3B. This region of chromosome 3 has been implicated by chromosomal translocation, deletion, and loss of heterozygosity in the pathogenesis of several malignant diseases. The contig allows accurate positioning of candidate genes, polymorphic markers, and other 3p rearrangements within this region. The contig, spanning approximately 6 Mb of DNA, contains 51 YACs identified by 27 markers, including a subset of CA repeats located in the 3p 14.1–14.2 interval. The order of CA microsatellites, derived from marker content of the YACs, is in agreement with the order previously determined by genetic linkage studies. We find that the protein-tyrosine phosphatase gamma gene, PTPRG, is located minimally 1 Mb proximal to the t(3;8) breakpoint The more proximal 3p homozygous deletion in the small-cell lung cancer cell line, U2020, is more than 5 Mb from the site of the 3;8 translocation. This integrated physical and genetic map provides a framework for further investigations of malignant diseases associated with proximal 3p loss. In addition, the positioning of separate 3p 14.2 aphidicolin-induced breakpoints suggests that FRA3B may represent a region rather than a single site.