Giant axonal neuropathy

Giant Axonal Neuropathy (GAN) is a rare genetic disorder that affects both the peripheral and central nervous systems. The disorder is characterized by abnormally large and dysfunctional axons, leading to a breakdown in communication between the brain and muscles.

Symptoms

The symptoms of GAN typically begin in early childhood and progress slowly as the disorder affects the nervous system. These symptoms may include:

• Difficulty walking
• Loss of muscle control
• Decreased sensation in the extremities
• Seizures
• Intellectual disability

Causes

GAN is caused by mutations in the GAN gene. This gene provides instructions for making a protein called gigaxonin, which is involved in the maintenance and function of nerve cells. Mutations in the GAN gene disrupt the normal function of gigaxonin, leading to the characteristic features of GAN.

Diagnosis

Diagnosis of GAN is based on clinical examination, genetic testing, and nerve biopsy. The presence of abnormally large axons in a nerve biopsy is a key diagnostic feature of GAN.

Treatment

There is currently no cure for GAN. Treatment is symptomatic and supportive, and may include physical therapy, occupational therapy, and medications to manage seizures and other symptoms.

Prognosis

The prognosis for individuals with GAN varies. The disorder is progressive, and most individuals with GAN become wheelchair-bound by their teens or early adulthood. Life expectancy is also reduced, with most individuals with GAN not surviving past their 30s.

See also

• Neurogenetic disorders
• Genetic disorders
• Neuropathy

References

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