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Largest study to date of rare genetic variants and asthma risk finds few associations. Despite a strong suspected link between genetics and asthma, commonly found genetic mutations account for only a small part of the risk for developing the disease -- a problem known as missing heritability.
Asthma can be caused by allergies to dust mites, grass, tree or ragweed pollen, mold spores, animal dander and even food. Other causes include colds or infections, air pollution and fumes from car exhaust, perfumes, and tobacco smoke.