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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.
No one really knows for sure. We do know that allergies play a role in many people with asthma but not in all. As with allergy, you can blame your family history, as there is a strong genetic component for asthma. If you or a loved one has asthma, it's important to understand the many asthma triggers.