Triple-A syndrome

Triple-A syndrome, also known as Allgrove syndrome, is a rare autosomal recessive disorder characterized by the triad of achalasia, Addison's disease, and alacrima. It is caused by mutations in the AAAS gene, which encodes the protein ALADIN, involved in nuclear pore complex function.

Signs and symptoms

The hallmark features of Triple-A syndrome include:

• Achalasia: A condition where the lower esophageal sphincter fails to relax properly, leading to difficulty swallowing (dysphagia), regurgitation, and sometimes chest pain.
• Addison's disease: A disorder of the adrenal glands leading to insufficient production of cortisol and aldosterone, resulting in symptoms such as fatigue, muscle weakness, weight loss, low blood pressure, and hyperpigmentation.
• Alacrima: A lack of tear production, which can lead to dry eyes and increased risk of eye infections.

Other symptoms may include neurological abnormalities, such as autonomic dysfunction, peripheral neuropathy, and cognitive impairment.

Genetics

Triple-A syndrome is inherited in an autosomal recessive pattern, meaning that both copies of the gene in each cell have mutations. The AAAS gene is located on chromosome 12q13. Mutations in this gene disrupt the function of the ALADIN protein, affecting the nuclear pore complex and leading to the symptoms of the syndrome.

Diagnosis

Diagnosis of Triple-A syndrome is based on clinical evaluation, family history, and genetic testing to identify mutations in the AAAS gene. Additional tests may include esophageal manometry for achalasia, ACTH stimulation test for adrenal insufficiency, and Schirmer's test for alacrima.

Management

Management of Triple-A syndrome is symptomatic and supportive. Treatment may include:

• For achalasia: Pneumatic dilation, Heller myotomy, or botulinum toxin injections.
• For Addison's disease: Lifelong hormone replacement therapy with glucocorticoids and mineralocorticoids.
• For alacrima: Artificial tears and other measures to protect the eyes.

Regular monitoring and multidisciplinary care are essential to address the various aspects of the syndrome.

Prognosis

The prognosis for individuals with Triple-A syndrome varies depending on the severity of symptoms and the effectiveness of treatment. With appropriate management, many individuals can lead relatively normal lives, although they may require ongoing medical care.

Related pages

• Achalasia
• Addison's disease
• Alacrima
• Autosomal recessive disorder

External links

• Orphanet: Triple A syndrome

Image related to Triple-A syndrome