title: Genetic mapping of two new DNA markers in Xq26-q28 relative to the fragile-X syndrome locus.
abstract: We have characterized and genetically mapped two new DNA markers (DXS311 and DXS312) with respect to 10 existing loci in Xq26----Xq28 in a set of 15 families in which the fragile-X [fra(X)] syndrome was segregating. Two-point and multipoint linkage analyses were performed taking into account the incomplete penetrance of the fra(X) mutation. The most likely order on the basis of these data is centromere-DXS79-DXS10-DXS311-DXS86-(F9-DXS99 )-(DXS98-DXS312)-fra(X)-DXS52- DXS15-F8C-telomere. DXS98 and one of the new loci, DXS312, were found to be the proximal markers closest to the fra(X) locus. The order F9-(DXS98-DXS312)-fra(X) was found to be 5.9 x 10(4) times more likely than the order (DXS98-DXS312)-F9-fra(X).
authors.affiliation: Department of Biology, Queen's University, Kingston, Ontario, Canada.
authors.forename: R
authors.initials: R
authors.lastname: Sood
authors.forename: L M
authors.initials: LM
authors.lastname: Mulligan
authors.forename: R
authors.initials: R
authors.lastname: Poon
authors.forename: B N
authors.initials: BN
authors.lastname: White
authors.forename: J J
authors.initials: JJ
authors.lastname: Holden
mesh_terms: D002874:Chromosome Mapping; D015342:DNA Probes; D005600:Fragile X Syndrome / Q000235:genetics*; D008040:Genetic Linkage; D005819:Genetic Markers; D006801:Humans; D009154:Mutation; D012150:Polymorphism, Restriction Fragment Length; D012729:Sex Chromosome Aberrations / Q000235:genetics*; D014960:X Chromosome
chemical_list: D015342:DNA Probes; D005819:Genetic Markers