Contemporary Gene Targeting Strategies for the Novice

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Abstract
Gene targeting in mouse embryonic stem (ES) cells is a fundamental methodology for generating mice with precise genetic modifications. Although there are many complex gene targeting strategies for creating a variety of diverse mutations in mice, most investigators initially choose to generate a null allele. Here we provide a guide for the novice to generate a null allele for a protein coding gene using a fundamental gene targeting strategy. Ultimately, a well considered gene targeting strategy saves significant amounts of time, money, and research animal lives. The straightforward strategy presented here bypasses many of the pitfalls associated with gene knockouts generated by novices. This guide also serves as a foundation for subsequently designing more complex gene targeting strategies.