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RANBP2 gene
Reviewed by Medicinsk Expert•Last updated: 2026-10-22•Gene

RANBP2 gene

The RANBP2 gene provides instructions for a protein that regulates the transport of molecules into and out of the cell nucleus and plays a role in cell division and nerve cell function.

Normal Function

The RANBP2 gene provides instructions for making a protein that typically associates with a protein complex known as the nuclear pore. The nuclear pore is embedded within the membrane that surrounds the cell's nucleus (the nuclear envelope), forming a channel that allows transport of molecules in and out of the nucleus. The RANBP2 protein is attached to the nuclear pore outside of the nucleus, where it helps regulate the transport of proteins and other molecules and helps modify proteins coming into or out of the nucleus.

When found elsewhere in the cell, the RANBP2 protein plays multiple roles during cell division, including breaking down and forming the nuclear envelope and dividing chromosomes. It is thought to associate with cell structures called microtubules, which form scaffolding within the cell to help maintain shape and transport materials. In nerve cells, the protein is likely involved in the regulation of energy and the maintenance of the blood-brain barrier.

Health Conditions Related to Genetic Changes

Acute necrotizing encephalopathy type 1

At least three mutations in the RANBP2 gene have been found to increase the risk of developing acute necrotizing encephalopathy type 1 (also known as IIAE3). This is a rare type of brain disease that occurs following a viral infection, such as the flu.

  • Mechanism: These mutations result in the production of a protein that cannot function normally. While the mutations do not cause health problems on their own, researchers suspect that individuals with these mutations produce too many immune system proteins called cytokines in response to an infection.
  • Impact: The excess cytokines lead to prolonged inflammation, which can damage tissues. Certain cytokines can be toxic to nerve cells in large amounts. It is likely that the combination of the altered RANBP2 protein and this abnormal immune response accounts for the neurological signs and symptoms.

Cancers

Genetic abnormalities involving the RANBP2 gene can cause an abnormal growth called an inflammatory myofibroblastic tumor. These are somatic mutations—acquired during a person's lifetime—that result in a rearrangement (translocation) within chromosome 2. This fuses part of the RANBP2 gene with another gene known as ALK. The resulting fusion protein promotes uncontrolled cell growth, which can lead to the formation of a tumor.

Frequently Asked Questions

There is no specific preventive treatment that guarantees protection against ANEA1, but proactive management is crucial. This includes staying up to date with vaccinations, particularly the annual influenza vaccine, to reduce the likelihood of the most common triggering infections. If a viral illness does occur, early medical intervention with antiviral medications (if appropriate for the virus) and close monitoring for neurological changes is essential. Parents and caregivers should be educated on the specific warning signs of encephalopathy to ensure rapid hospitalization if symptoms appear.
Early signs often mimic a severe flu or other viral infection, including high fever, vomiting, and irritability. However, the critical red flags are rapid neurological deterioration, such as seizures, altered consciousness, or lethargy, occurring shortly after the onset of the viral illness. Because ANEA1 can progress quickly, any child with a known RANBP2 mutation who develops a fever and shows signs of confusion or excessive sleepiness should be evaluated in an emergency setting immediately.
No, carrying a RANBP2 mutation increases the risk but does not guarantee that every viral infection will lead to acute necrotizing encephalopathy. Many individuals with these mutations may experience typical viral illnesses without severe neurological complications. However, the risk is significantly higher during systemic viral infections, particularly influenza, and the severity of the reaction can vary from mild encephalitis to severe, life-threatening brain necrosis.
The RANBP2 protein is a key component of the nuclear pore complex, which controls the transport of molecules in and out of the cell nucleus. In nerve cells, it also plays a role in maintaining the blood-brain barrier and regulating cellular energy. When RANBP2 is dysfunctional due to a mutation, the blood-brain barrier may become more permeable or the cells may be less able to handle the inflammatory stress of a viral infection. This vulnerability allows inflammatory cytokines to damage brain tissue more severely than in individuals with normal RANBP2 function.
Source: MedlinePlus, National Library of Medicine

MedlinePlus brings together authoritative health information from the National Library of Medicine (NLM), the National Institutes of Health (NIH), and other government agencies and health-related organizations.

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