Alpha-1-antitrypsin deficiency


What is Alpha-1 antitrypsin deficiency?

Alpha-1 antitrypsin deficiency (AATD) is an inherited condition, caused by changes, or mutations, in the SERPINA1 gene, that can lead to lung disease and liver disease. There is a strong risk factor for emphysema in particular, and AATD is a common known genetic risk factor for this. It is caused by low levels of alpha-1 antitrypsin in the blood, which is a protein made in the liver that usually protects the lungs.

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CHEST Foundation. Retrieved from

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