Abstract
We have defined a radiation hybrid panel for Xq11-q22 characterized with 20 DNA markers and shown how the panel can be used in conjunction with Alu-PCR and a gridded X-specific cosmid library to isolate cosmids from a preselected subregion. We used Alu-PCR products derived from two radiation hybrids, IHB2-B30 and IHB1-A12, sharing a segment in proximal Xq13.1, containing DXS453 to CCG1, as the only human component in common. Used as probes, these Alu-PCR products identified 39 cosmids on the gridded X-cosmid libraties that were positive for both probes. The target specificity of the derived cosmids was very high, 11 of 13 cosmids tested mapped to the region of fragment overlap in the hybrids, as was determined by two translocation breakpoints bordering most of the target interval. Accounting for a redundancy of four in the libraries, the isolated 39 cosmids should correspond to about 10 independent loci derived from the region of fragment overlap defined by these radiation hybrids. In addition, a subset of five radiation hybrids having breakpoints in the target region could be used to further subdivide the 11 cosmids into an ordered set of five submapping intervals of Xq13.1.
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Röhme, D., Sidén, T., van der Maarel, S.M. et al. Radiation hybrids for the proximal long arm of the X chromosome and their use in the derivation of an ordered set of cosmid markers from a defined subregion in proximal Xq13.1. Somat Cell Mol Genet 20, 1–10 (1994). https://doi.org/10.1007/BF02257481
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DOI: https://doi.org/10.1007/BF02257481