Abstract
A hybrid cell line containing the mouse X chromosome on a human background has been used to construct linking libraries from the mouse X chromosome, and approximately 250 unique EagI and NotI clones have been identified. Seventy-three clones have been sublocalized onto the X chromosome using interspecific Mus spretus/Mus domesticus crosses and a panel of somatic cell hybrids carrying one-half of reciprocal X-autosome translocations. The average spacing of the linking clones mapped to date is about one every 2 Mb of DNA. Two clones from the central region of the chromosome have been physically linked by pulsed-field gel electrophoresis. A large number of clones contain conserved sequences, indicating the presence of CpG-rich island-associated genes. The clones isolated from these libraries provide a valuable resource for comparative mapping between man and mouse X chromosomes, isolation of X-linked disease loci of interest by reverse genetics, and analysis of the long-range structure and organization of the chromosome.
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