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Lessons from gene knockouts

The authors describe the technique for the application of homologous recombination in embryonic stem cells, which is now widely used to engineer mice which carry specific knockouts of genes. A summary is given of some of the knowledge of the pathogenesis of and resistance to infections with parasites, bacteria, or viruses which has accumulated during recent years, based on the investigation of knockout mice. Special emphasis is placed on knockout animals which la ck components of the cytokine network, lack genes which are critical for the correct presentation of antigens or are deficient in different immune cell subsets, in addition, a brief explanation is offered of the possibilities for inducing targeted deletions or mutations in genes of livestock species (e.g., by nuclear transfer or by mutagenesis using the alkylating agent N-ethyl-N-nitrosourea) which could lead to the breeding of animals which are resistant to infectious diseases in the future

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