Two anonymous X-specific human sequences detecting restriction fragment length polymorphisms in region Xq26----qter

Somat Cell Mol Genet. 1984 Nov;10(6):607-13. doi: 10.1007/BF01535226.


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.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Base Sequence
  • Chromosome Mapping
  • DNA Restriction Enzymes
  • Female
  • Gene Frequency
  • Genetic Linkage
  • Humans
  • Pedigree
  • Polymorphism, Genetic
  • X Chromosome*


  • DNA Restriction Enzymes