AI Summary Alpha-1 antitrypsin deficiency (AATD) is an inherited disorder, caused by SERPINA1 gene changes, that can damage the liver, lungs, or both. Symptoms include shortness of breath, wheezing, and fatigue, though liver disease may stay silent until advanced. Diagnosis uses blood tests, genetic testing, and imaging. No treatment reverses it; augmentation therapy protects the lungs, while liver care relies on monitoring. Quitting smoking and seeing a specialist early help.
Source: Alpha 1 Antitrypsin Deficiency (Amsety reviewed source)
Medically reviewed.
Alpha-1 antitrypsin deficiency (AATD) is an inherited genetic disorder that can cause liver disease, lung disease, or both. It happens when the alpha-1 antitrypsin (AAT) protein — normally made in the liver to protect organs from harmful proteins — is produced in the wrong shape and becomes trapped inside liver cells instead of reaching the bloodstream.
Many people with AATD are unaware they have it, since symptoms most often appear between ages 20 and 50. About 15% of adults with AAT deficiency develop cirrhosis, and liver disease can also begin in infancy or early childhood. There is no cure, but lung-directed therapy and careful monitoring of liver health can help manage the condition.
Liver Health AI Assistant
Ask Aimy
Aimy answers from LiverDirectory’s reviewed health information — helping patients make sense of liver-health terms, prepare for specialist visits, and explore what to look up next.
About AATD
Alpha-1 antitrypsin deficiency is an inherited genetic disorder that can cause liver or lung disease. Alpha-1 antitrypsin (AAT) is a protein made in the liver that protects organs from the harmful effects of other proteins in the body, particularly an enzyme called neutrophil elastase that can damage lung tissue.
AATD occurs when AAT proteins are produced in the wrong shape and cannot enter the bloodstream because they are trapped inside liver cells. This causes two problems at once: too little AAT reaches the lungs to protect them, raising the risk of lung disease, while the abnormal protein builds up inside liver cells, raising the risk of liver disease.
AATD is caused by mutations in the SERPINA1 gene. The classic and most severe form, known as the Pi*ZZ genotype, occurs when someone inherits two copies of the mutated 'Z' allele — one from each parent. The clinical course varies: some people with this genotype develop significant liver disease, while others remain relatively symptom-free.
Severe AAT deficiency occurs when blood levels of AAT fall below the amount needed for adequate lung protection, which dramatically increases the risk of developing liver disease, lung disease, or both.
How AATD may feel
AATD symptoms reflect the symptoms of liver disease, lung disease, or both. AATD can affect people of all ages, including infants, though symptoms are most likely to appear between the ages of 20 and 50.
Getting checked
AATD is diagnosed through a mix of blood tests, genetic testing, and imaging that check both liver and lung involvement. A doctor will also do a physical exam, listening for wheezing or checking for a barrel-shaped chest.
AATD may be suspected if someone is diagnosed with emphysema before age 45 and never smoked, was exposed to lung toxins, or has a family history of AATD. Unexplained liver disease or hepatitis without another clear cause can also point to AATD.
Care & management
There is no cure for AATD, and treatment focuses on protecting the lungs, monitoring the liver, and managing any related conditions. Because the deficiency starts in the liver, augmentation therapy that helps the lungs does not treat AATD-related liver disease.
For adults with severe AATD and clinically significant emphysema, doctors may prescribe alpha1-proteinase inhibitor (A1-PI) augmentation therapy (brand names include Prolastin-C, Glassia, and Aralast NP). Given weekly by intravenous infusion, it replaces the missing AAT protein in the bloodstream to help protect lung tissue from ongoing damage. This therapy is not indicated for treating AATD-related liver disease.
Anyone with AATD who smokes must quit, since smoking sharply increases the risk and pace of lung damage. Avoiding dust, chemical fumes, and other airway irritants, staying current on influenza and pneumococcal vaccines, and getting regular exercise as tolerated all support lung health alongside any prescribed therapy.
Because AATD can also affect the liver, your doctor may recommend regular liver blood tests and imaging to watch for signs of fibrosis or cirrhosis, even if you feel well. Treatment for any related condition, such as cirrhosis, is managed alongside AATD care. In advanced liver disease, liver transplantation may be considered.
There is currently no medication that reverses AATD or treats AATD-related liver disease directly. Care instead focuses on protecting lung function, watching liver health closely, and quitting smoking.
How AATD develops
AATD is caused by inherited mutations in the SERPINA1 gene, which carries the instructions for making the alpha-1 antitrypsin protein. Two copies of the mutation, one from each parent, must be inherited for someone to have AAT deficiency.
AATD is a genetic condition present from birth, but environmental exposures — especially smoking — strongly influence how severe symptoms become and how quickly lung damage progresses.
When to get checked
AATD often develops silently, especially the liver-related form, so many people don't find out until it's discovered through testing done for another reason. Seeking evaluation early can help catch problems before they progress.
Consider speaking with a healthcare provider if you were diagnosed with emphysema before age 45 and never smoked, have unexplained liver disease or hepatitis, or have a family history of AATD, early emphysema, or unexplained liver disease. Persistent shortness of breath, wheezing, or unexplained fatigue are also reasons to seek evaluation.
Because AATD-related liver disease can be silent for years, regular monitoring for people with a known diagnosis or family history helps catch fibrosis or cirrhosis before it becomes advanced. Quitting smoking and avoiding lung irritants as early as possible also helps preserve lung function.
Depending on which organs are affected, your doctor may refer you to a pulmonologist for lung involvement and to a hepatologist or gastroenterologist for liver involvement. These specialists can assess disease severity and guide long-term management.
Find doctors who treat AATD-related liver disease and connect with a specialist near you.
Eating & liver health
There is no special diet that reverses AATD, but general liver-healthy eating habits can support liver function and overall health for people living with the condition, especially if liver involvement is present.
A liver-friendly eating pattern emphasizes fruits and vegetables, whole grains, lean protein, and healthy unsaturated fats, while limiting added sugars, salt, and foods high in trans or saturated fat. People with cirrhosis may need to limit sodium closely, so it's worth discussing your specific needs with your care team.
Staying hydrated, preparing meals ahead of time, and reading nutrition labels can all make it easier to stick with liver-healthy habits day to day.
Common questions
Alpha-1 antitrypsin deficiency (AATD) is an inherited genetic disorder that can cause liver disease, lung disease, or both. Alpha-1 antitrypsin (AAT) is a protein made in the liver that protects organs from the harmful effects of other proteins. In AATD, the protein is made in the wrong shape and gets trapped in liver cells. Too little AAT reaches the lungs to protect them, and the protein that stays in the liver raises the risk of liver disease.
Symptoms look like those of liver disease, lung disease, or both. Common ones include shortness of breath after even mild activity, wheezing, a hacking cough, frequent respiratory infections, fatigue, unexplained weight loss, a rapid heartbeat when standing, and a barrel-shaped chest. Symptoms are most likely to appear between ages 20 and 50. Liver disease can cause few obvious symptoms until it is advanced, so tell your doctor if you have risk factors even when you feel well.
Doctors combine a physical exam with tests. They listen to your lungs for wheezing and look for a barrel-shaped chest. Tests may include an alpha-1 antitrypsin blood test, genetic testing, an arterial blood gases test, a chest X-ray or CT scan, and a lung function test. AATD may be suspected if you had emphysema before age 45 and never smoked, or if you have a family history of AATD. Liver disease or hepatitis with no other clear cause can also point to it.
No. There is currently no medication that reverses AATD or treats the liver disease it causes. Weekly intravenous augmentation therapy replaces the missing AAT protein to help protect the lungs, but it is not used for liver disease. Liver care focuses on regular blood tests and imaging to watch for fibrosis or cirrhosis, and on treating complications if they develop. Doctors may consider liver transplantation in advanced liver disease.
Yes, AATD is inherited. You must receive one changed SERPINA1 gene copy from each parent to have the deficiency. People with only one changed copy may make slightly less AAT but usually have few, if any, problems. AATD is believed to affect about 1 in 1,500 to 3,500 people of European ancestry and is uncommon in people of Asian ancestry. A family history of AATD, liver disease, or early emphysema raises the chance. Many people don't know they have it.
Yes. AATD can affect people of all ages, including infants. Liver disease and cirrhosis can begin in infancy or early childhood, although many people don't have symptoms until adulthood. If AATD runs in your family or your child has unexplained liver problems, ask a doctor about testing. A pediatric liver specialist can explain what monitoring your child needs.
Yes. Exposure to smoke, dust, and chemical fumes can increase AATD symptoms. Anyone with AATD who smokes must quit. Avoiding other airway irritants also helps protect your lungs. If you need support to quit, ask your care team about options.
Medical disclaimer: LiverDirectory provides educational information and a directory of providers. It does not provide medical advice, diagnosis, or treatment. Always consult a licensed physician regarding any medical condition.
