An unresolved bottleneck in bacterial artificial chromosome (BAC) transgenesis is low efficiency generation of founder mice because of suboptimal quality of the manipulated BAC DNA. Using mini-gel electrophoresis and electro-elution that circumvents CsCl(2) centrifugation, column chromatography, and resin purifications, we have used RECOCHIP, a commercially available dialysis cassette for the purification of BAC DNA that generates transgenic founders with up to 80% efficiency.
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