Abstract
Linkage analysis has been carried out in nine unrelated families segregating for X-linked ichthyosis (steroid sulfatase deficiency) using seven polymorphic DNA markers from the distal Xp. Close linkage was found between the disease locus and the loci DXS16, DXS89, and DXS143. In all families except one, Southern hybridization with the human steroid sulfatase cDNA and GMGX9 probes showed a deletion of corresponding loci in affected males. Three patients belonging to the same family had no evident deletion with either of the two above-mentioned probes. None of the other six DNA loci included in the linkage analysis were found to be deleted.
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