Alpha-1 Antitrypsin Deficiency

Introduction

Alpha-1 antitrypsin deficiency, also known as alpha-1, is a hereditary genetic condition. This condition is characterized by reduced levels of a lung-protective protein, AAT (Alpha-1 antitrypsin). Alpha-1 elevates the susceptibility to specific ailments, such as emphysema (degradation of lung air sacs), cirrhosis (scarring/destruction of the liver), and panniculitis (a rare skin disorder). Certain conditions have the potential to be life-threatening. Alpha-1 is also known as genetic COPD (chronic obstructive pulmonary disease) or genetic emphysema.

What Do You Mean by Alpha-1 Antitrypsin Deficiency?

Alpha-1 antitrypsin (AAT) deficiency is a genetic condition that can cause lung and liver damage. In this condition, one can observe low levels of protein called AAT. AAT was found to protect the lungs.

Which Members of Society Are Affected by Alpha-1?

Individuals with two copies of the SERPINA1 gene are uniquely affected by alpha-1 antitrypsin deficiency; this leads to the synthesis of an atypical variant of the alpha-1 protein. The blueprint for the correct functioning of the body is encoded in genes.

• Genetic modifications have the potential to induce reduced or absent levels of AAT in the lungs; furthermore, the presence of AAT in the liver may vary depending on the specific alterations.

• Every single one of these modifications possesses the capacity to induce health complications.

• Alpha-1 carriers, defined as individuals with one mutated copy of the gene and one unaltered copy, may manifest symptoms and possess an increased vulnerability to lung injury, especially in the case of smoking.

Do You Know the Symptoms of Alpha-1 Antitrypsin Deficiency?

The symptoms of Alpha-1 appear to be similar to the condition called COPD (chronic obstructive pulmonary disease). Symptoms usually start between the age of 30 and 50 years. The symptoms of AAT include:

• Shortness of breath that occurs particularly with physical activity or exertion.

• Wheezing - a whistling sound during breathing.

• Persistent cough, accompanied by phlegm (thick viscous secretions by the mucous membranes of the respiratory passages.

• Severe fatigue or weakness.

• Repeated respiratory infections.

Approximately ten percent of newborns and 15 percent of grown individuals with Alpha-1 experience the onset of liver illness.

Indications and manifestations of liver disease may include:

• Jaundice (characterized by the yellowing of the skin and eyes).

• Itchy skin.

• Edema (fluid-filled swelling) in the lower extremities or abdominal cavity (ascites).

• Hematemesis (medical condition of vomiting blood).

• Infrequently, the initial symptoms of Alpha-1 manifest as painful, erythematous nodules on the skin (panniculitis). These can migrate on the body and rupture, resulting in the release of fluid or pus.

Would You Like to Know How Alpha-1 Antitrypsin Deficiency Is Caused?

As we know, an individual has two sets of genes that are obtained from their parents. These are obtained as one gene from each parent. The difference between the games determines some of the characteristics such as the color of the eye, or hair. These genes also determine how your body functions.

The difference (mutation) in the particular genes causes Alpha-1 antitrypsin deficiency. In our body, a gene called SERPINA 1 is responsible for making a protein called AAT. This protein AAT functions to protect the lungs from being damaged.

Whenever there are mutations in the SERPINA gene, it alters how our body makes AAT. Some mutations may tell the body to make less AAT, some may tell our body not to make any AAT and some may cause AAT to form incorrectly. Any of these changes may lead to low levels of AAT. This may be responsible for not being able to protect the lungs from damage.

It was observed that if both copies of SERPINA1 genes are affected or have mutations, it indicates Alpha-1 antitrypsin deficiency. Based on the genes that are affected, the individual will have a 75 percent chance of developing lung symptoms.

If a person has a mutation in one of your copies of the gene, the body can make sufficient AAT. This type of person may be at risk of developing lung damage. This may develop eventually, particularly when a person has the habit of smoking.

Parents can pass the affected Alpha 1 gene to their children. If both parents are carriers, then there may be a chance of 25 percent of two abnormal genes to get into their children and there may be a 50 percent chance of being carriers (one abnormal and one normal gene). It was noticed that both genes are responsible for making AAT, it is said to be a codominant inheritance.

What Are the Consequences of a Deficiency in Alpha-1 on the Respiratory and Hepatic Functions?

Alpha-1 antitrypsin (AAT) is a hepatically synthesized protein that circulates in the bloodstream and reaches the lungs. It serves as the inhibitor for the enzyme known as neutrophil elastase.

• Neutrophil elastase plays a crucial role in fighting lung infections, but it can also cause damage to healthy lung tissue. Following the period in which elastase aids in fighting an infection, AAT helps limit its activity to prevent lung harm.

• If a genetic mutation results in diminished amounts of AAT or the production of structurally flawed AAT, there will be an insufficient amount of this protein in the lungs to inhibit elastase. This leads to lung damage.

• Elastin gives structural integrity to the alveoli. This enables them to expand and compress like a resilient elastic band. If the elastin is not there, then the alveoli can lose its structural integrity and adapt to a flaccid state. This condition affects respiration and hampers the normal intake of oxygen. This condition is known as emphysema.

• Gene mutations that alter the shape of AAT slow down its translocation from the liver. Accumulation occurs in that location and can result in the formation of scars. Due to its inability to exit the liver, it remains confined and cannot migrate to the circulation or lungs.

How Is Alpha-1 Antitrypsin Deficiency Diagnosed?

Alpha-1 can be identified by using blood tests. It is difficult to recognize this condition as its symptoms are found to be similar to other diseases. The tests can be done if an individual has liver symptoms or COPD.

The test to be done includes:

Blood Tests: These tests are done to know the levels of AAT and to know how well the liver is functioning. If a low level of AAT is found, doctors suggest genetic testing to identify the gene differences in Alpha-1.

Imaging: X-rays and computed tomography (CT) can help to know the signs of Apha-1 in the lungs. These tests help determine the location and severity of the damage.

Pulmonary Function Tests: These tests are used to know how well your lungs are functioning. A machine is used and breathing into the machine helps to know about the function of the lungs.

Liver Ultrasound or Elastography: These tests are done to know the issues present in your liver. These help to know about the scarring if present in the liver.

Liver Biopsy: This is done to know the extent of damage in the liver. A small sample of tissue from your liver is subjected to examination to know the severity of liver damage.

How Is Alpha-1 Treated?

It was noted that those with Alpha-1 before pulmonary symptoms appear are found to have better outcomes after the treatment than those with pulmonary symptoms. The treatment plan depends on the test reports and the severity of the disease.

The treatment plan for AAT includes:

• Augmentation Therapy: This therapy is done for a long time by increasing the levels of AAT in your blood. In this procedure, AAT is donated to increase the levels of AAT. This therapy is required once a week and is done through infusion.

• Medications: Medications are used to control symptoms of COPD. Antibiotics and corticosteroids can be used to treat the symptoms of COPD that are flared or exacerbated.

• Oxygen Therapy: Oxygen is administered through either a tube or a mask to increase the oxygen supply to the lungs.

• Pulmonary Rehabilitation: This involves an exercise program that is done to increase breathing capacity, especially among those with conditions like COPD.

• Lung Transplantation: Lung transplantation may be planned for those with advanced lung disease.

• Quitting Smoking: Quitting smoking and even avoiding second-hand smoke helps in the treatment.

Avoiding alcohol and discussing with healthcare providers regarding any medications should be done to avoid liver damage.

How Can I Prevent Alpha-1?

Alpha-1 is an inherited disease, hence can not be prevented. This does not mean that the affected person will get diseases that the Alpha-1 causes. Even after being diagnosed with Alpha-1, several things can be done to reduce the risk of organ damage.

These preventive measures include:

• You should avoid smoking or vaping. Avoid even secondhand smoking.

• Exposure to lung irritants must be avoided. This can be done by using masks when you work with chemicals and dust.

• If you have Alpha-1, you should limit or completely avoid alcohol. Alpha-1 may cause liver damage. Hence, limiting the alcohol helps further damage the liver.

• Certain medications may cause liver damage. Hence, it is important to discuss with your doctor before taking some medications that can cause liver damage.

• Vaccinating against certain conditions like flu, pneumonia, COVID-19, and hepatitis A and B is necessary.

• Washing hands and taking other precautionary measures help avoid certain respiratory illnesses that can cause lung inflammation.

• If a family member has Alpha-1, it becomes important to be screened for Alpha-1.

• If a person is having Alpha-1 and wants to have children, they should speak with a genetic counselor. They can help to know about passing genetic changes to their children.

What Are the Complications of Alpha-1?

Alpha-1 can affect the lungs, liver, and other organs. The complications of Alpha-1 include:

• Progressive lung conditions like COPD.

• Permanent damage to the airways. These include emphysema and bronchiectasis.

• Scarring of the liver (cirrhosis).

• Liver cancer or hepatocellular carcinoma.

• Heart, liver, or respiratory failure.

• Inflammation of fat under the skin (panniculitis).

Complications of Alpha-1 can be fought by following the guidelines about foods:

• Eating plenty of fruits and vegetables.

• It is important to avoid processed foods.

• Choose to eat healthy proteins like beans and nuts.

• Getting plenty of vitamin D is necessary to have overall health.

• Strictly avoid alcohol.

What Is the Life Expectancy of Someone With Alpha-1 Antitrypsin Deficiency?

Life expectancy may vary from person to person. A few may live a normal life span and some may experience life-threatening complications. The prognosis of the condition is based on the following:

• How early is the condition diagnosed?

• What type of Alpha-1 does the affected person have, and how does it affect the body?

• The amount of organ damage present at the time of diagnosis.

• How well the lungs are functioning.

• How fast is lung or liver disease worsening?

• If the smoking habit is present, it reduces the life expectancy with Alpha-1.

Conclusion

Alpha-1 antitrypsin is a genetic condition. This condition is found to be associated with lung and liver diseases. Early diagnosis of this condition should be done. This helps an affected individual to lead a healthy lifestyle. The treatments required may be given accordingly to decrease the progression of the lung disease. There is no prevention for this condition, but some measures, if taken early, can improve the symptoms and avoid the complications of the disease.

Key takeaways from iCliniq:

AAT is a genetic condition that cannot be avoided. Knowing in detail about this condition can help identify the condition early. Early diagnosis helps achieve effective treatment. This further helps in achieving a good quality of life.