title: Use of enzyme-deficient cell lines as feeder layers.
abstract: Enzyme-deficient cell lines, lacking TK or HPRT and therefore unable to grow in HAT medium, may be used as feeder layers to enhance clonal growth of wild-type cells. Low numbers of wild-type test cells may be plated in HAT medium with 5 X 10(5) HAT-sensitive feeder cells per Petri dish. The feeder cells remain attached and metabolizing for 1 to 2 weeks, but ultimately die and detach, leaving colonies of test cells. This feeder layer technique is very simple and flexible and could have wide applicability.
mesh_terms: D002448:Cell Adhesion; D002452:Cell Count; D002455:Cell Division; D002460:Cell Line; D002999:Clone Cells / Q000166:cytology*; D003470:Culture Media; D003584:Cytological Techniques; D007041:Hypoxanthine Phosphoribosyltransferase / Q000378:metabolism; D009154:Mutation; D013937:Thymidine Kinase / Q000378:metabolism
chemical_list: D003470:Culture Media; D007041:Hypoxanthine Phosphoribosyltransferase; D013937:Thymidine Kinase