Giant axonal neuropathy is an inherited condition involving dysfunction of a specific type of protein in nerve cells (neurons). The condition is characterized by abnormally large and dysfunctional axons, which are the specialized extensions of nerve cells that are required for the transmission of nerve impulses. Giant axonal neuropathy generally appears in infancy or early childhood. It progresses slowly as neuronal injury becomes more severe.
The symptoms of giant axonal neuropathy usually begin in the peripheral nervous system, which governs movement and sensation in the arms, legs, and other parts of the body. Most individuals with this disorder first have problems with walking. Over time, they may lose sensation, coordination, strength, and reflexes in their limbs. Hearing and visual problems may also occur.
As the disorder progresses, the brain and spinal cord (central nervous system) may become involved, causing a gradual decline in mental function, loss of control of body movement, and seizures.
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