Hereditary Atransferrinemia

Hereditary atransferrinemia is an extremely rare genetic disorder that affects how your body moves iron through the bloodstream. People with this condition have little to no transferrin, a protein that carries iron to where it needs to go in your body. Without transferrin, iron cannot reach your red blood cells to make hemoglobin, the substance that carries oxygen throughout your body.

This condition is autosomal recessive, which means you need to inherit a faulty gene from both parents to develop it. When iron cannot be transported properly, two serious problems happen at once. First, your red blood cells become pale and unable to carry oxygen well, causing severe anemia. Second, iron builds up in organs like your liver and heart because it has nowhere else to go. This creates a rare situation where your body has too much iron overall but not enough iron in the right places.

Only a few dozen cases have been reported worldwide since the condition was first identified. Early detection through blood testing can help guide treatment to manage both the anemia and the dangerous buildup of iron in tissues.

People with hereditary atransferrinemia typically show symptoms in infancy or early childhood. Common symptoms include:

• Severe anemia causing extreme fatigue and weakness
• Very pale skin and mucous membranes
• Rapid heartbeat or heart problems
• Enlarged liver or spleen
• Growth delays in children
• Dark urine due to excess iron
• Joint pain or bone problems
• Shortness of breath during normal activities
• Frequent infections due to immune system problems

Because this condition is present from birth, symptoms usually appear early in life. Most cases are identified in the first year of life when severe anemia becomes apparent.

Hereditary atransferrinemia is caused by mutations in the TF gene, which provides instructions for making transferrin protein. When both copies of this gene are faulty, your body cannot produce functional transferrin. Without this carrier protein, iron remains trapped in tissues instead of being delivered to bone marrow where red blood cells are made. Parents who each carry one mutated gene typically have no symptoms but can pass the condition to their children.

Risk factors are limited to genetics. Children born to parents who both carry a mutation in the TF gene have a 25% chance of developing the condition. The disorder affects males and females equally and has been reported across different ethnic groups. There are no lifestyle or environmental factors that cause this condition, as it is determined entirely by the genes inherited at conception.

Diagnosing hereditary atransferrinemia starts with blood tests that reveal a specific pattern. The Total Iron Binding Capacity test, or TIBC, measures how much transferrin is available to carry iron. In people with this condition, TIBC is essentially absent or extremely low because they produce little to no transferrin. Blood tests also show severe hypochromic anemia, where red blood cells are unusually pale and small. Serum iron levels and ferritin may be elevated, showing that iron is present but cannot be properly transported.

Rite Aid offers testing that includes TIBC as part of our flagship blood panel. This can help identify abnormal iron transport patterns. Genetic testing can confirm the diagnosis by identifying mutations in the TF gene. Additional tests may measure organ function to check for iron damage to the liver, heart, or other tissues.

Treatment for hereditary atransferrinemia focuses on managing both the anemia and iron overload. Common approaches include:

• Plasma or transferrin infusions to provide the missing carrier protein
• Regular blood transfusions to treat severe anemia
• Iron chelation therapy to remove excess iron from organs
• Monitoring liver and heart function regularly
• Working with a hematologist who specializes in blood disorders
• Genetic counseling for families planning to have children

Treatment is lifelong and requires close medical supervision. Early intervention can prevent serious organ damage from iron buildup. If you or your child shows signs of severe anemia with pale blood cells, see a doctor right away for evaluation.