title: Two anonymous X-specific human sequences detecting restriction fragment length polymorphisms in region Xq26----qter.
abstract: Two anonymous X-specific sequences isolated from a genomic library of flowsorted X chromosomal DNA were selected for study because they revealed restriction fragment length polymorphisms in the region Xq26----qter. One sequence, DXS10, detected a two-allele TaqI polymorphic system with allele frequencies of 0.33 and 0.67. The other, 4D-8, defined an MspI polymorphism with allele frequencies of 0.18 and 0.82. DXS10 is tightly linked to the hypoxanthine phosphoribosyltransferase (HPRT) locus with recombination distance theta = O cM at LOD = 5.55 (95% probability limit theta less than 15 cM). DXS10 maps to Xq26 but is not contained within the HPRT locus itself. 4D-8 shows no detectable linkage to the HPRT locus, with maximum likelihood estimate for theta = 50 cM and a LOD score of -2.61 at theta = 5 cM. These two polymorphisms provide additional chromosomal loci for gene mapping by linkage at the distal end of the long arm of the human X chromosome.
mesh_terms: D001483:Base Sequence; D002874:Chromosome Mapping; D004262:DNA Restriction Enzymes; D005260:Female; D005787:Gene Frequency; D008040:Genetic Linkage; D006801:Humans; D010375:Pedigree; D011110:Polymorphism, Genetic; D014960:X Chromosome
chemical_list: D004262:DNA Restriction Enzymes