Cross-species studies for target validation.

The completion of the genome sequences of several model organisms and the recent development of high throughput procedures to map genes, expression patterns and interactions is providing a steadily increasing number of candidate target genes. The function of most of these genes still remains unknown. Therefore, there is a growing demand in genetically tractable animal models in which the function of individual factors can be studied in large scale, particularly of those that are thought to segregate with human disorders. In this paper, current methods to validate target gene function and the advantages of different model organisms are compared.