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Mol Cell Biol. 1982 May; 2(5): 526-534

Construction of microcell hybrid clones containing specific mouse chromosomes: application to autosomes 8 and 17.

ABSTRACT

Fibroblast cultures prepared from mice homozygous for a Robertsonian translocation (centric fusion) between autosomes 8 and 17 [Rb(8.17)] were used as donors in microcell-mediated chromosome transfer experiments. By using hamster recipient cells deficient in adenine phosphoribosyltransferase (APRT-) and selecting for expression of murine APRT (a chromosome 8 marker), microcell hybrids were isolated which retained only the mouse Rb(8.17) translocation in addition to the hamster chromosome complement. The translocation was stable in cells maintained under APRT+ selective pressure, and mouse marker traits encoded by genes on both chromosomes 8 and 17 segregated concordantly. A second family of hybrid clones was constructed by fusing microcells derived from wild-type mouse fibroblasts with APRT- hamster cells. Four of six clones analyzed retained only mouse chromosome 8. These studies demonstrated that microcell hybrids containing specific Robertsonian translocations as the only donor-derived genetic material can be obtained. Furthermore, a number of Robertsonian translocations between chromosomes which carry selectable markers (chromosomes 3, 8, and 11) and other autosomes have been described. By using fibroblast cultures prepared from mice containing these translocations as donors in microcell fusions, 18 of the 20 mouse chromosomes could be selectively fixed in different hybrid clones. Thus, a collection of 20 hybrid clones, each containing a single, specific mouse chromosome, can be constructed by using the strategy described in this report. The potential utility of such a monochromosomal hybrid panel is discussed.

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