Abstract
As a critical step toward cloning the breakpoint of the (3;8) translocation observed in familial renal cell carcinoma and a common fragile site on chromosome 3p (FRA3B), we have characterized the 3p14 region containing the breakpoint and FRA3B by fluorescence in situ hybridization (FISH), pulsed-field gel electrophoresis (PFGE), and genetic linkage analysis. Of 23 cosmids mapped by FISH, 14 cosmids were distal to the breakpoint of t(3;8) and 9 were proximal. Analyses of FRA3B by FISH were identical to those for the (3;8) breakpoint and indicated that the breakpoint of t(3;8) occurred at or very close to the fragile site. We have also constructed a genetic linkage map and a preliminary long-range restriction map using PFGE of the 3p14 region. The linkage results were consistent with the physical data. The combined results of FISH, PFGE, and linkage analysis establish a basis for further experiments to clone the (3;8) breakpoint and FRA3B.
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