Autoimmune polyendocrine syndrome
Rare diseases with autoimmune attack on multiple endocrine organs.
Autoimmune polyendocrine syndromes (APSs) are a group of rare, varied conditions where the immune system attacks more than one endocrine organ, though non-endocrine organs may also be involved. Three main types exist, along with other diseases that feature endocrine autoimmunity.
Type 1 is caused by a recessive mutation in the AIRE gene, leading to issues like hypoparathyroidism, adrenal insufficiency, hypogonadism, vitiligo, and candidiasis. Type 2 follows an autosomal dominant pattern with multiple genes involved, resulting in adrenal insufficiency paired with hypothyroidism or type 1 diabetes. IPEX syndrome is X-linked recessive, caused by a FOXP3 gene mutation on the X chromosome; most affected boys develop diabetes and diarrhea, and many die from widespread autoimmune attacks, while girls are carriers who may experience mild symptoms.
Each type has a distinct genetic cause. In IPEX syndrome, the FOXP3 gene (located at Xp11.23) is responsible for the condition, inherited via an X-linked recessive pattern in males.
For diagnosing type 1, methods include endoscopic exams, CT scans, and histologic testing. Differential diagnoses for this condition include CD25 deficiency, STAT5B deficiency, severe combined immunodeficiency, and X-linked thrombocytopenia.
Management may involve immunosuppressive therapy for type 1, and ketoconazole can be used in certain circumstances for this type as well.
Quick Facts
- Types
- APS type1, / APS type 2, / IPEX syndrome
- Causes
- FOXP3 gene is involved in the mechanism
- Diagnosis
- Endoscopic, CT scan
- Treatment
- Depends on type
Facts from the source article.
Lore & Background
Autoimmune polyendocrine syndrome type 1 is an autosomal recessive syndrome due to mutation of the AIRE gene, resulting in hypoparathyroidism, adrenal insufficiency, hypogonadism, vitiligo, candidiasis and others. Autoimmune polyendocrine syndrome type 2 is an autosomal dominant syndrome due to multifactorial gene involvement, resulting in adrenal insufficiency plus hypothyroidism and/or type 1 diabetes. Immunodysregulation polyendocrinopathy enteropathy X-linked syndrome (IPEX syndrome) is X-linked recessive due to mutation of the FOXP3 gene on the X chromosome; most patients develop diabetes and diarrhea, and many die due to autoimmune activity against many organs. Boys are affected, while girls are carriers and might experience mild disease.
Reader's Guide
Each type of this condition has a different genetic cause. IPEX syndrome is inherited in males by an X-linked recessive process, with the FOXP3 gene located at Xp11.23. Diagnosis for type 1 may involve endoscopic, CT scan, and histologic tests. Differential diagnosis includes CD25 deficiency, STAT5B deficiency, severe combined immunodeficiency, and X-linked thrombocytopenia. Management for type I may include immunosuppressive therapy, and ketoconazole can also be used under certain conditions. The syndromes are significant as models of organ-specific autoimmunity and highlight the role of genetic mutations in immune regulation, with implications for understanding broader autoimmune mechanisms.
Did You Know?
- Autoimmune polyendocrine syndrome type 1 is due to mutation of the AIRE gene.
- IPEX syndrome is X-linked recessive and affects boys, while girls are carriers.
- Differential diagnosis includes CD25 deficiency and STAT5B deficiency.
More in Rare syndromes 1-24
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