Hybrid embryonic stem cell-derived tetraploid mice show apparently normal morphological, physiological, and neurological characteristics.
ES cell-tetraploid (ES) mice are completely derived from embryonic stem cells and can be obtained at high efficiency upon injection of hybrid ES cells into tetraploid blastocysts. This method allows the immediate generation of targeted mouse mutants from genetically modified ES cell clones, in contrast to the standard protocol, which involves the production of chimeras and several breeding steps. To provide a baseline for the analysis of ES mouse mutants, we performed a phenotypic characterization of wild-type B6129S6F(1) ES mice in relation to controls of the same age, sex, and genotype raised from normal matings. The comparison of 90 morphological, physiological, and behavioral parameters revealed elevated body weight and hematocrit as the only major difference of ES mice, which exhibited an otherwise normal phenotype. We further demonstrate that ES mouse mutants can be produced from mutant hybrid ES cells and analyzed within a period of only 4 months. Thus, ES mouse technology is a valid research tool for rapidly elucidating gene function in vivo.
Artemis Pharmaceuticals GmbH. Klinik II und Poliklinik für Innere Medizin der Universität Köln and Center of Molecular Medicine, Cologne, Germany.
Frieder
F
Schwenk
Branko
B
Zevnik
Jens
J
Brüning
Mathias
M
Röhl
Antje
A
Willuweit
Anja
A
Rode
Thomas
T
Hennek
Gunther
G
Kauselmann
Rudolf
R
Jaenisch
Ralf
R
Kühn
D000818:Animals; D001522:Behavior, Animal / Q000502:physiology*; D001755:Blastocyst / Q000166:cytology / Q000502:physiology; D001774:Blood Chemical Analysis; D001835:Body Weight; D002478:Cells, Cultured; D004622:Embryo, Mammalian / Q000166:cytology*; D004734:Energy Metabolism / Q000502:physiology; D005260:Female; D005818:Genetic Engineering / Q000379:methods*; D006822:Hybrid Cells / Q000502:physiology; D007527:Isoenzymes / Q000378:metabolism; D008297:Male; D051379:Mice / Q000235:genetics*; D008815:Mice, Inbred Strains; D008817:Mice, Mutant Strains; D009024:Morphogenesis / Q000502:physiology; D010641:Phenotype; D011123:Polyploidy; D013234:Stem Cells / Q000166:cytology / Q000502:physiology*
D007527:Isoenzymes