Abstract
Asthma is a common chronic inflammatory disease of the airways characterized by wheezing, shortness of breath, chest tightness, and cough. Asthma is closely associated with atopic dermatitis (AD), and individuals with AD have a marked increased risk of later asthma. Interestingly, this increased risk is probably dose dependent so that individuals with early onset AD or more severe eczema have an even higher risk of later development of asthma. The advent of loss-of-function mutations in the filaggrin gene (FLG) has led to the hypothesis that the skin acts as the site of primary allergic sensitization through defects in the epidermal barrier with secondary reactivity in the airways. Several studies of independent populations chiefly from Europe, the United States, and Asia have shown that the overall risk of asthma in FLG mutation carriers is increased about 1.5 times relative to noncarriers. In contrast, the risk of asthma in individuals with AD carrying FLG null mutations appears to be increased about three times relative to noncarriers, whereas their risk of eczema-free asthma seems not to be increased. Besides affecting the risk of asthma in patients with AD, FLG mutation carriers also seem to have more severe asthma and an increased risk of asthma exacerbations.
Keywords
Atopic Dermatitis Alopecia Areata Atopic Dermatitis Patient Combine Genotype Netherton SyndromeReferences
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