Auto immune polyglandular syndrome – 1 includes all except?
**Autoimmune Polyglandular Syndrome-1 (APS-1) Core Concept**
Autoimmune Polyglandular Syndrome-1 (APS-1) is a rare autoimmune disorder characterized by the presence of autoimmune Addison's disease, autoimmune thyroid disease, and autoimmune gastritis, often associated with a mutation in the AIRE gene. This syndrome is distinguished from APS-2 by its earlier onset and the presence of mucocutaneous candidiasis.
**Why the Correct Answer is Right**
APS-1 typically presents in childhood with a combination of mucocutaneous candidiasis, hypoparathyroidism, and Addison's disease. The AIRE gene mutation leads to impaired expression of self-antigens in the thymus, resulting in peripheral tolerance breakdown and autoantibody production. The clinical manifestations of APS-1 can vary, but the combination of mucocutaneous candidiasis, hypoparathyroidism, and Addison's disease is characteristic.
**Why Each Wrong Option is Incorrect**
**Option A:** Autoimmune thyroid disease is a feature of APS-1, so this option is incorrect as it is a characteristic of the syndrome.
**Option B:** Autoimmune gastritis is also a feature of APS-1, so this option is incorrect as it is a characteristic of the syndrome.
**Option C:** Insulin-dependent diabetes mellitus is a feature of APS-2, not APS-1, making it the correct answer as it is not included in APS-1.
**Clinical Pearl / High-Yield Fact**
APS-1 is a rare but critical condition to recognize in pediatric patients, as early diagnosis and treatment can significantly improve outcomes.
**Correct Answer: C. Insulin-dependent diabetes mellitus.**