Genetic hyperferritinemia without iron overload

Genetic hyperferritinemia without iron overload is a rare condition characterized by persistently elevated serum ferritin levels in the absence of true iron overload in the body. Unlike conditions such as hereditary hemochromatosis, where high ferritin reflects dangerous accumulation of iron in organs, individuals with genetic hyperferritinemia without iron overload have elevated ferritin due to genetic variants that increase ferritin production or release without corresponding excess iron storage. This distinction is critically important because these individuals do not require phlebotomy or iron chelation therapy, and unnecessary treatment could lead to iron deficiency anemia. The condition is most commonly associated with mutations in the FTL gene (encoding ferritin light chain), particularly variants in the coding region that lead to increased serum ferritin but do not cause tissue iron deposition. It is also sometimes referred to as benign hyperferritinemia. Importantly, this condition must be distinguished from hereditary hyperferritinemia-cataract syndrome (HHCS), which involves mutations in the iron-responsive element (IRE) of the FTL gene and is associated with bilateral cataracts. In genetic hyperferritinemia without iron overload, patients typically have no cataracts and no organ damage. Affected individuals are usually identified incidentally when blood tests reveal elevated ferritin levels. Transferrin saturation and liver iron concentration (measured by MRI) are typically normal. The condition is considered benign, and no specific treatment is needed. The primary clinical significance lies in avoiding misdiagnosis as iron overload conditions, which could lead to inappropriate and potentially harmful interventions such as repeated phlebotomy. Genetic testing can confirm the diagnosis and provide reassurance to patients and their families.

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