Refined Subchromosomal Location of 21 Expressed Sequence Tags from Unknown Genes at Region 11p15

Twenty-one expressed sequence tags (ESTs) belonging to unidentified transcripts were mapped to 9 intervals at 11p15.5-p15.3. Thirteen were mapped to a region of an estimated size of 7 Mb with the help of a YAC contig. The remaining eight were mapped outside this region, and the centromeric or telo- meric position of the ESTs relative to the YAC contig was defined with the help of a cellular hybrid containing a derivative chromosome 11 with a breakpoint within the region covered by the contig. The average size of the intervals, where the ESTs were mapped, was estimated to be 0.3-0.4 Mb. The refinement of the chromosomal location of these ESTs could be of great help in the identification of potential candidate genes for disease locus mapping at 11p15.