Animal models created by transgenic and gene knockout technology are invaluable in evaluating gene functionin vivo and in determining how certain genes regulate cell growth and differentiation and how alterations inthese genes contribute to cancer. Mice are genetically modified in this facility either by pronucleus injection ofDNA into fertilized eggs, by injection of retroviruses into the perivitteline space of fertilized eggs, or by injectionof mutated embryonic stem cells (ES-cells) into blastocysts. The objective of this shared resource is to providegenetically modified mice to principal Investigators within the Cancer Center in the most time- and costeffectiveway. In addition, the availability of these mouse strains greatly stimulates interactions amonginvestigators at St Jude.
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