title: [Characteristics of somatic cell hybrids (mouse x Chinese hamster) with a different ratio of chromosome sets from the parent species. II. Thymidine kinase activity].
abstract: The activity of thymidine kinase (TK) was studied in series of somatic cell hybrids between the mouse cell line 3T3-4E (TK-) and Chinese hamster cells M-15-1 (HGPRT-). Four groups of hybrid lines with different ratio of parental chromosome sets have been investigated: 1) three lines containing one hamster and one mouse chromosome set (1 hs+1 ms); 2) one line with 2 hs+1 ms; 3) one line containing 3 hs+1 ms and 4) one line containing 1 hs+2 ms. Mixtures of extracts from the parental cells were shown to possess the expected TK activity. The calculation of the activity per cell revealed that the 1 hs+1 ms and 2 hs+1 ms hybrid lines possessed about 50% of the initial hamster cell TK activity. The decreased TK activity in these hybrids might be due either to a loss of hamster chromosomes or to some inhibitory effect of mouse genome in cells with the studied ratio of parental sets. The enzyme activity in the 3 hs+1 ms hybrid was as expected, about three times greater than that of hamster cells.
mesh_terms: D000818:Animals; D006224:Cricetinae; D006822:Hybrid Cells / Q000201:enzymology*; D006824:Hybridization, Genetic; D051379:Mice; D011003:Ploidies; D013937:Thymidine Kinase / Q000378:metabolism*
chemical_list: D013937:Thymidine Kinase
vernacular_title: Kharakteristika gibridov somaticheskikh kletok (mysh' x kitaĭskiĭ khomiachok) s raznym sootnosheniem khromosomynykh naborov roditel'skikh vidov. Soobshchenie II. Aktivnost'timidinkinazy