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Alpha-1 Antitrypsin Deficiency: Gene Mutation, Symptoms, Treatment, and Life Expectancy

Medical Reviewer:

Alpha-1 antitrypsin deficiency definition and facts*

*Facts medically reviewed by

What is alpha-1 antitrypsin deficiency (AATD)?

Alpha-1 antitrypsin deficiency (AATD) is a disorder that causes a deficiency or absence of the alpha-1 antitrypsin (AAT) protein in the blood. AAT is made in the liver and sent through the bloodstream to the lungs, to protect the lungs from damage. Having low levels of ATT (or no ATT) can allow the lungs to become damaged, making breathing hard. Age of onset and severity of AATD can vary based on how much ATT an affected person is missing. In adults, symptoms may include shortness of breath; reduced ability to exercise; wheezing; respiratory infections; fatigue; vision problems; and weight loss. Some people have chronic obstructive pulmonary disease (COPD) or asthma. Liver disease (cirrhosis) may occur in affected children or adults. Rarely, AATD can cause a skin condition called panniculitis.[1] AATD is caused by mutations in the SERPINA1 gene and is inherited in a codominant manner.[2] Treatment is based on each person's symptoms and may include bronchodilators; antibiotics for upper respiratory tract infections; intravenous therapy of AAT; and/or lung transplantation in severe cases.[1][3]

Chart of signs and symptoms of lung and liver disease caused by AATD

The Human Phenotype Ontology (HPO) provides the following list of features that have been reported in people with this condition. Much of the information in the HPO comes from Orphanet, a European rare disease database. If available, the list includes a rough estimate of how common a feature is (its frequency). Frequencies are based on a specific study and may not be representative of all studies.

Signs and Symptoms of Alpha-1 Antitrypsin Deficiency
Signs and Symptoms

Approximate number of patients (when available)

EmphysemaVery frequent (present in 80%-90% of cases)
Hepatic failure (liver failure)Very frequent (present in 80%-90% of cases)
Hepatitis (liver inflammation or infection)Frequent (present in 30%-79% of cases)
An abnormally enlarged liver (hepatomegaly)Frequent (present in 30%-79% of cases)
Jaundice (signs of a liver problem)Frequent (present in 30%-79% of cases)
Cirrhosis (a complication of liver disease)Occasional (present in 5%-29% of cases)
Autosomal recessive inheritance
COPD (chronic obstructive pulmonary disease)
Shortness of breath (Dyspnea)
Elevated hepatic transaminases
Liver cancer (hepatocellular carcinoma)

Medically Reviewed by a Doctor on 6/22/2017


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