Autoimmune polyendocrine syndrome type 1
Editor-In-Chief: Prab R Tumpati, MD
Obesity, Sleep & Internal medicine
Founder, WikiMD Wellnesspedia &
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Autoimmune polyendocrine syndrome type 1 | |
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Synonyms | Autoimmune polyglandular syndrome type 1, APECED |
Pronounce | N/A |
Specialty | N/A |
Symptoms | Hypoparathyroidism, adrenal insufficiency, chronic mucocutaneous candidiasis |
Complications | Addison's disease, hypothyroidism, type 1 diabetes |
Onset | Childhood |
Duration | Lifelong |
Types | N/A |
Causes | Mutations in the AIRE gene |
Risks | Family history |
Diagnosis | Clinical evaluation, genetic testing |
Differential diagnosis | Autoimmune polyendocrine syndrome type 2, hypoparathyroidism, Addison's disease |
Prevention | None |
Treatment | Hormone replacement therapy, antifungal medications |
Medication | Hydrocortisone, fludrocortisone, levothyroxine |
Prognosis | Variable, depends on management |
Frequency | Rare |
Deaths | Rare, with proper treatment |
Autoimmune Polyendocrine Syndrome Type 1 (APS-1), also known as Autoimmune Polyendocrinopathy-Candidiasis-Ectodermal Dystrophy (APECED), is a rare genetic disorder characterized by the dysfunction of multiple endocrine glands leading to hormone deficiencies. This condition is caused by mutations in the AIRE gene, which plays a crucial role in the development of immune tolerance by promoting the elimination of self-reactive T cells. The syndrome is inherited in an autosomal recessive manner, meaning that two copies of the defective gene, one from each parent, are required for the disease to manifest.
Symptoms and Diagnosis
APS-1 is characterized by a triad of chronic mucocutaneous candidiasis, hypoparathyroidism, and Addison’s disease. However, the presentation can vary widely among individuals, with some experiencing additional autoimmune disorders such as type 1 diabetes, hypothyroidism, and vitiligo. Diagnosis of APS-1 is primarily based on clinical criteria, including the presence of at least two of the three major components of the syndrome. Genetic testing for mutations in the AIRE gene can confirm the diagnosis.
Treatment and Management
There is no cure for APS-1, and treatment focuses on managing symptoms and preventing complications. This may include hormone replacement therapies for endocrine deficiencies, antifungal treatments for candidiasis, and immunosuppressive medications for other autoimmune manifestations. Regular monitoring and early intervention for new symptoms are crucial in managing the disease.
Epidemiology
APS-1 is a rare disorder, with a higher prevalence in certain populations, such as the Finnish and Sardinian people, due to a founder effect. The exact incidence is unknown but is estimated to be between 1 in 25,000 to 1 in 100,000 individuals worldwide.
Pathophysiology
The AIRE gene encodes a protein that is expressed in the thymus and plays a key role in the negative selection of T cells, eliminating those that are self-reactive. Mutations in the AIRE gene lead to a breakdown in immune tolerance, resulting in the autoimmune attack on various organs and tissues. The exact mechanisms by which these mutations cause the specific manifestations of APS-1 are still under investigation.
Research Directions
Current research on APS-1 focuses on understanding the underlying mechanisms of the disease, identifying new treatment targets, and improving genetic counseling and diagnosis. Gene therapy and personalized medicine approaches are being explored as potential future treatments.
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Contributors: Prab R. Tumpati, MD