Physical mapping of Xq24-25 around loci closely linked to the X-linked lymphoproliferative syndrome locus: an overlapping YAC map and linkage between DXS12, DXS42, and DXS37.

We have localized several markers in the Xq24–25 region containing DXS12, DXS42 and DXS37 which are closely linked to the X-linked lymphoproliferative syndrome (XLP) locus. A 850-kb restriction map has been established by mapping overlapping YACs and showed that DXS12 and DXS42 are physically linked within about 50 kb. DXS37 is separated from these two loci at a maximum distance of 3,700 kb. Several new probes have been generated which will contribute to further physical mapping of this region.