Abstract
Using human telomeric repeats and centromeric alpha repeats, we have identified adjacent single copy cosmid clones from human chromosome 22 cosmid libraries. These single copy cosmids were mapped to chromosome 22 by fluorescence in situ hybridisation (FISH). Based on these cosmids, we established contigs that included part of the telomeric and subtelomeric regions, and part of the centromeric and pericentromeric regions of the long arm of human chromosome 22. Each of the two cosmid contigs consisted of five consecutive steps and spanned approximately 100–150 kb at both extreme ends of 22q. Moreover, highly informative polymorphic markers were identified in the telomeric region. Our results suggest that the telomere specific repeat (TTAGGG) n encompasses a region that is larger than 40 kb. The cosmid contigs and restriction fragment length polymorphism markers described here are useful tools for physical and genetic mapping of chromosome 22, and constitute the basis of further studies of the structure of the subtelomeric and pericentromeric regions of 22q. We also demonstrate the use of these clones in clinical diagnosis of different chromosome 22 aberrations by FISH.
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Xie, YG., Han, FY., Bajalica, S. et al. Identification, characterisation and clinical applications of cosmids from the telomeric and centromeric regions of the long arm of chromosome 22. Hum Genet 94, 339–345 (1994). https://doi.org/10.1007/BF00201589
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DOI: https://doi.org/10.1007/BF00201589