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Ferroportin Disease

Ferroportin Disease  


DISEASE OVERVIEW

Ferroportin disease, also known as hemochromatosis type 4, is a rare genetic disorder characterized by the abnormal accumulation of iron in the body. Ferroportin disease is caused by changes (variants or mutations) of the SLC40A1 gene. The specific symptoms associated with ferroportin disease can vary greatly from one person to another. Some individuals may only have elevated levels of ferritin, a protein that binds to iron and is used as an indicator of the body’s iron stores in the blood plasma. Other individuals may develop symptoms similar to classic HFE-related hemochromatosis.

Ferroportin disease is classified as an iron overload disorder, a group of disorders characterized by the abnormal accumulation of iron in the body. It is a separate, distinct disorder from classic hereditary hemochromatosis. Ferroportin disease is caused by variants in a different gene and is inherited in a different manner from other forms of hemochromatosis.

SIGNS & SYMPTOMS

The symptoms of ferroportin disease vary greatly from one person to another. Researchers believe that different variants in the SLC40A1 gene are associated with different symptoms. Generally, ferroportin disease is separated into two main forms.

Most individuals with ferroportin disease develop a mild form of the disorder. These individuals have elevated levels of ferritin in the blood plasma (hyperferritinemia) and low levels of saturated transferrin (the protein that carries iron in the blood). As affected individuals age, mild liver damage (hepatic fibrosis) and joint symptoms may occur.

Other individuals develop a rarer form of ferroportin disease that resembles the more common classic form of hemochromatosis (hemochromatosis type 1 or HFE-related). The transferrin saturation is significantly elevated in this form. Symptoms associated with this form include joint pain, abnormalities in the heart’s rhythm or heartbeat pattern (arrhythmias) and diabetes. Liver damage is more prevalent in this form of ferroportin disease and can progress to cause advanced scarring (cirrhosis) of the liver.

CAUSES

Ferroportin disease is caused by variants in the SLC40A1 gene. The SLC40A1 gene contains instructions for creating ferroportin, a specialized protein that is crucial to the proper export of iron from cells. Ferroportin also plays a role in the proper breakdown (metabolism) of iron. Iron is a critical mineral that is found in all cells of the body and is essential for the body to function and grow properly. Iron is found in many types of food including red meat, poultry, eggs and vegetables. Iron levels must remain in a specific range within the body, otherwise they can cause anemia (due to low iron levels) or damage affected organs (due to high iron levels).

Variants in the SLC40A1 gene result in low levels of functional ferroportin. The lack of functional ferroportin ultimately results in the abnormal accumulation of iron in the cells and tissues of the body. Different variants of the SLC40A1 gene affect the ferroportin protein in different ways, altering the export and metabolism of iron accordingly. Researchers believe that the different ways in which SLC40A1 variants affect ferroportin account for the two different forms of the disorder.

Ferroportin disease is inherited as an autosomal dominant genetic condition. Dominant genetic disorders occur when only a single copy of an abnormal gene is necessary for the appearance of the disease. The abnormal gene can be inherited from either parent or can be the result of a new gene change in the affected individual. The risk of passing the abnormal gene from affected parent to offspring is 50 percent for each pregnancy. The risk is the same for males and females.

DISORDERS WITH SIMILAR SYMPTOMS

Symptoms of the following disorders can be similar to those of ferroportin disease. Comparisons may be useful for a differential diagnosis.

Primary disorders of iron overload are a group of rare disorders characterized by iron accumulation in the body. This group includes hemochromatosis, atransferrinemia, acaeruloplasminemia, neonatal hemochromatosis and African iron overload. Hemochromatosis has been separated into four distinct disorders – hereditary (classic) hemochromatosis, also known as HFE-related hemochromatosis; hemochromatosis type 2 (juvenile hemochromatosis); hemochromatosis type 3, also known as TFR2-related hemochromatosis and hemochromatosis type 4, also known as ferroportin disease. Types 2-4 have been more recently bracketed as ‘non-HFE’ hemochromatosis. The specific symptoms related to these disorders can vary depending upon the location and extent of iron accumulation. Common symptoms include fatigue, abdominal pain, lack of sex drive, joint pain and heart abnormalities. If left untreated, iron can build up in various organs in the body causing serious, life-threatening complications. (For more information on these disorders, choose the specific disorder name as your search term in the Rare Disease Database.)

DIAGNOSIS

A diagnosis of ferroportin disease is made based upon identification of characteristic symptoms, a detailed patient history, a thorough clinical evaluation and a variety of specialized tests. A family history with affected individuals in successive generations is highly suggestive (autosomal dominant inheritance). Blood tests can reveal certain findings associated with ferroportin disease including high levels of ferritin in the blood and, in the milder form of the disease, low or normal saturation of transferrin, another protein that plays a role in the proper transport of iron within the body. Molecular genetic testing for variants in the SLC40A1 gene is available and necessary to confirm the diagnosis.

Treatment

The treatment of ferroportin disease is directed toward the specific symptoms that are apparent in each individual. Specific treatment may depend on the severity and form of ferroportin disease.

Individuals with the form of ferroportin disease that resembles classic hemochromatosis may be treated with regular phlebotomy, a procedure in which blood is removed via a vein. Individuals with the mild form of ferroportin disease may not necessarily require treatment and phlebotomy in these individuals is often complicated by anemia.

Genetic counseling is recommended for affected individuals and their families. Other treatment is symptomatic and supportive.

TYPE OF DOCTOR AND DEPARTMENT: Gastroenterology and Hepatology SPECIALIST CAN DIAGNOSE THIS DISEASE. 

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