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Nucleic Acids Res. 1992 Aug 11;20(15):3815-20.

Targeting of the creatine kinase M gene in embryonic stem cells using isogenic and nonisogenic vectors.

Author information

  • 1Department of Cell Biology and Histology, Faculty of Medical Sciences, University of Nijmegen, The Netherlands.

Abstract

Replacement vectors with genomic DNA originating from different mouse strains were used to introduce site-specific mutations into the creatine kinase M (CKM) gene of mouse embryonic stem (ES) cells. Here we demonstrate that in mouse strain 129-derived ES cells, the gene is at least 25-fold more efficiently targeted with an isogenic, 129-derived vector (129-pRV8.3) than with a nonisogenic, BALB/c-specific vector (BALB/c-pRV8.3). The two targeting constructs were identical except for allelic differences which were typed by partial sequencing. These included base pair mismatches (2%) and a polymorphic [GTC]-repeat length variation. Both in separate transfections as well as in cotransfections with mixed vectors, homologous disruption of the CKM gene resulted uniquely from the 129-isogenic DNA. Our data confirm earlier observations on requirements for homologous recombination in pro- and eukaryotic systems and indicate that targeting of the CKM locus is highly sensitive to small sequence differences between cognate segments in the endogenous and incoming DNA.

PMID:
1508665
[PubMed - indexed for MEDLINE]
PMCID:
PMC334053
Free PMC Article
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