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In this paper we have summarized the evidence for a genetic contribution to asthma as well as the recent advances in techniques for identifying the location and function of genes that cause complex diseases. We have also reviewed how these techniques have been applied to the study of asthma and allergy. It is likely that rapid additional advances will be made over the next several years. There are ongoing genome-wide searches to identify additional genes. An understanding of the genetic variation that predisposes people to asthma and the atopic diseases could open a variety of potential diagnostic and therapeutic avenues. Firstly, the identification of the specific mutations that alter the immune response could provide targets for gene therapy. However, in the short run this is unlikely because the risks and costs associated with gene therapy do not presently justify application to alleviate the relatively nonlethal …