A map has been assembled that extends from the XY homology region in Xq21.3 to proximal Xq24, approximately 20 Mb, formatted with 200 STSs that include 25 dinucleotide repeat polymorphic markers and more than 80 expressed sequences including 30 genes. New genes HTRP5, CAPN6, STPK, 14-3-3PKR, and CALM1 and previously known genes including BTK, DDP, GLA, PLP, COL4A5, COL4A6, PAK3, and DCX are localized; candidate loci for other disorders for which genes have not yet been identified, including DFN-2, POF, megalocornea, and syndromic and nonsyndromic mental retardation, are also mapped in the region. The telomeric end of the contig overlaps a yeast artificial chromosome (YAC) contig from Xq24-q26 and with other previously published contigs provides complete sequence-tagged site (STS)/YAC-based coverage of the long arm of the X chromosome. The order of published landmark loci in genetic and radiation hybrid maps is in general agreement. Combined with high-density STS landmarks, the multiple YAC clone coverage and integrated genetic, radiation hybrid, and transcript map provide resources to further disease gene searches and sequencing.
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