Abstract
Two pseudoautosomal loci DXYS15 and DXYS17 from the pairing region of the human sex chromosomes display a high variability with at least eight alleles each. The structural elements responsible for the polymorphisms have been isolated and sequenced. In both cases the variations result from DNA rearrangements occurring in tandemly repeated sequences (minisatellites) of 21-29 nucleotides for DXYS15 and 28-33 nucleotides for DXYS17. At reduced stringency, the DXYS15 minisatellite detects other hypervariable sequences located in other parts of the genome and hence represents a new family of minisatellites. In contrast to most other known hypervariable families, the DXYS15 hypervariable sequence displays a very high AT content.
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