title: Incorporation of isolated chromosomes and induction of hypoxanthine phosphoribosyltransferase in Chinese hamster cells.
abstract: Evidence is presented for the uptake of radioactive-labeled isolated Chinese hamster chromosomes following incubation with Chinese hamster cells. Metaphases were found which contained radioactive labeled chromosomes in a very low frequency, and in some of the labeled chromosomes only one chromatid was labeled. Incubation of hypoxanthine phosphoribosyltransferas (HPRT)-deficient Chinese hamster cells with chromosomes isolated from HPRT+ Chinese hamster or human cells resulted in the appearance of HPRT+ cells. Clones derived from these cells were isolated in HAT medium. Cells in mitosis during incubation with the chromosomes yielded thr-e times more HPRT+ clones than did cells in interphase. The intraspecies combination involving recipient cells and chromosomes from Chinese hamster origin yielded significantly higher numbers of HPRT+ clones than did the interspecies system using human chromsomes and Chinese hamster recipient cells (5 X 10(-5) and 6 X 10(-6) respectively). Electrophoresis of HPRT from Chinese hamster cells treated with human chromosomes revealed the pattern of the human enzyme.
mesh_terms: D000818:Animals; D002455:Cell Division; D002875:Chromosomes; D002999:Clone Cells; D006224:Cricetinae; D004790:Enzyme Induction; D006822:Hybrid Cells; D007041:Hypoxanthine Phosphoribosyltransferase / Q000096:biosynthesis*; D066298:In Vitro Techniques; D010641:Phenotype
chemical_list: D007041:Hypoxanthine Phosphoribosyltransferase