Figure 1  Strategy for Disruption of the Mouse Acadm Gene
(A) The MCAD IV2 insertion targeting vector with a deleted 1.3-kb region encompassing exon 10 and flanking sequences. MCAD IV2 undergoes gap repair upon homologous recombination at the endogenous Acadm locus resulting in a duplication of exons 8, 9, and 10 at the disrupted allele.
(B) Southern blot analysis of EcoRI-digested genomic DNA from ES cells screened by PCR. Probe A, a DNA fragment consisting of a portion of exon 10 that is not present in the targeting vector, hybridizes to an endogenous 3.1-kb fragment and, upon homologous recombination, to a 13.2-kb fragment. Lane 1 represents a wild-type ES cell line, and Lane 2 and 3 represent targeted ES cell lines.