title: Production of homozygous mutant ES cells with a single targeting construct.
abstract: We have developed a simple method for producing embryonic stem (ES) cell lines whereby both alleles have been inactivated by homologous recombination and which requires a single targeting construct. Four different ES cell lines were created that were heterozygous for genes encoding two guanine nucleotide-binding protein subunits, alpha i2 and alpha i3, T-cell receptor alpha, and beta-cardiac myosin heavy chain. When these heterozygous cells were grown in high concentrations of G418, many of the surviving cells were homozygous for the targeted allele and contained two copies of the G418 resistance gene. This scheme provides an easy method for obtaining homozygous mutationally altered cells, i.e., double knockouts, and should be generally applicable to other genes and to cell lines other than ES cells. This method should also enable the production of cell lines in which more than one gene have had both alleles disrupted. These mutant cells should provide useful tools for defining the role of particular genes in cell culture.
authors.affiliation: Howard Hughes Medical Institute, Brigham and Women's Hospital, Boston, Massachusetts.
authors.forename: R M
authors.initials: RM
authors.lastname: Mortensen
authors.forename: D A
authors.initials: DA
authors.lastname: Conner
authors.forename: S
authors.initials: S
authors.lastname: Chao
authors.forename: A A
authors.initials: AA
authors.lastname: Geisterfer-Lowrance
authors.forename: J G
authors.initials: JG
authors.lastname: Seidman
mesh_terms: D000818:Animals; D015152:Blotting, Northern; D015139:Blotting, Southern; D002460:Cell Line; D004247:DNA / Q000235:genetics / Q000302:isolation & purification; D004622:Embryo, Mammalian; D005091:Exons; D019204:GTP-Binding Proteins / Q000235:genetics; D005822:Genetic Vectors; D006720:Homozygote; D046911:Macromolecular Substances; D051379:Mice; D016296:Mutagenesis; D010735:Phosphoglycerate Kinase / Q000235:genetics; D011948:Receptors, Antigen, T-Cell / Q000235:genetics; D015183:Restriction Mapping; D013234:Stem Cells / Q000502:physiology*; D013937:Thymidine Kinase / Q000235:genetics
chemical_list: D046911:Macromolecular Substances; D011948:Receptors, Antigen, T-Cell; D004247:DNA; D013937:Thymidine Kinase; D010735:Phosphoglycerate Kinase; D019204:GTP-Binding Proteins