Abstract
The locus (DYT3) underlying the X-linked dystonia-parkinsonism syndrome (XDP) was delineated within proximal Xq12-Xq13.1 by analysis of linkage, allelic association, and haplotypes. Short tandem repeat polymorphisms at loci DXS227, DXS559, DXS453, DXS106, DXS339, and DXS135 were studied. The occurrence of a recombination within a three-generation family established DXS559 as the distal flanking marker of DYT3. /phi/ and /delta/ values were determined as indicators of the degree of allelic association between DYT3 and the six marker loci. In addition, haplotype analysis was performed at the loci studied. The findings establish DXS106 as the proximal flanking marker of DYT3. Given an approximate distance between DXS106 and DXS559 of 3.0 Mb, isolation of DYT3 is now feasible by positional cloning techniques.
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