title: Difference between diploid and aneuploid Chinese hamster cells in replication at mid-S-phase.
abstract: Following partial synchronization of the heteroploid Chinese hamster cell line V-79 and of normal diploid lung fibroblasts of the Chinese hamster in culture, their DNA replication during S-phase aws compared by means of a BrdU-incorporation/thymidine pulse technique and Hoechst-Giemsa differential staining of metaphase chromosomes. This comparison indirectly shows the S-phase of the heteroploid cells of V-79 to be 2 h shorter than the diploid cell S-phase. When the thymidine pulse is applied to diploid lung fibroblasts at mid-S-phase, differential staining colours metaphase chromosomes a pale blue. Performing the corresponding experiment with V-79 cells, neither a pale blue nor dark red staining is obtained, but rather an intermediate shade, showing prominently dark staining regions in parts. The pause in DNA synthesis observed at mid-S-phase of the diploid Chinese hamster lung fibroblasts seems to be omitted at mid-S-phase of the V-79 cells.
mesh_terms: D000782:Aneuploidy; D000818:Animals; D001399:Azure Stains; D001973:Bromodeoxyuridine; D002453:Cell Cycle; D002460:Cell Line; D002875:Chromosomes / Q000648:ultrastructure; D006224:Cricetinae; D004261:DNA Replication; D007399:Interphase; D008168:Lung; D013936:Thymidine / Q000378:metabolism; D014316:Tritium
chemical_list: D001399:Azure Stains; D014316:Tritium; D001973:Bromodeoxyuridine; D013936:Thymidine