Genetics of asthma and allergies

This article is a literature review focusing on the underlying concepts of human genetics related to asthma and allergies. Asthma is classified as a c omplex genetic disorder with genetic susceptibility and an appropriate envi ronmental stimulus necessary for the expression of disease. Intermediate ph enotypes of asthma, which are used to study the disease, include the total IgE levels, the specific immune response, and end organ response. Because g ene products cause the inflammation in asthma and allergies, the molecular cell biology of these events is reviewed. Although no one gene is implicate d in causing asthma, candidate genes involved in the multiple phenotypic ex pressions of asthma are described.