SEQUENCE-ANALYSIS OF A PARTIAL DELETION OF THE HUMAN STEROID SULFATASE GENE REVEALS 3-BP OF HOMOLOGY AT DELETION BREAKPOINTS

The majority of patients with steroid sulfatase deficiency have a deletion of the entire STS gene located on the distal short arm of the human X chromosome; however, two patients with partial gene deletions have been identified. We now report the sequences at the breakpoints of a deletion of the 3′ end of the STS gene. The deletion starts within intron 7 of the gene and extends over 150 kb downstream toward the centromere. Analysis of sequences flanking the deletion breakpoints revealed 3 bp of homology. The 3′ flanking sequence provides a new probe for isolation of YAC clones and for studying patients with deletions in this region of the X chromosome. © 1992.