title: Multipoint linkage of 9 anonymous probes to HPRT, factor 9, and fragile X.
abstract: We have analyzed the segregation of restriction fragment length polymorphisms (RFLPs) associated with 9 anonymous probes detecting loci DXS10, DXS15, DXS19, DXS37, DXS51, DXS52, DXS98, DXS99, and DXS100 and probes for HPRT and F9 in a set of 40 families segregating fragile X (fra(X]. Using two-point and multipoint analysis, we have established their relative genetic locations. The results indicate that DXS99 and DXS10, unlike previous reports, are not tightly linked to F9. A new locus was found to map within the F9 - fra(X) region. DXS98 showed 6% recombination with fra(X) and appeared to be the closest locus to fra(X). These results will be useful for mapping the relative position of newly defined X probes in this region and for future genetic studies of families with fra(X), hemophilia B, or Lesch-Nyhan mutations.
mesh_terms: D002874:Chromosome Mapping; D015342:DNA Probes; D005164:Factor IX / Q000235:genetics*; D005260:Female; D005600:Fragile X Syndrome / Q000235:genetics*; D008040:Genetic Linkage; D002836:Hemophilia B / Q000235:genetics; D006801:Humans; D007041:Hypoxanthine Phosphoribosyltransferase / Q000235:genetics*; D007926:Lesch-Nyhan Syndrome / Q000235:genetics; D008126:Lod Score; D008297:Male; D012150:Polymorphism, Restriction Fragment Length; D012729:Sex Chromosome Aberrations / Q000235:genetics*; D014960:X Chromosome
chemical_list: D015342:DNA Probes; D005164:Factor IX; D007041:Hypoxanthine Phosphoribosyltransferase