[Polyglandular autoimmune syndromes : An overview]

Area of Science:

• Immunology
• Endocrinology
• Genetics

Background:

• Polyglandular autoimmune syndromes (PGAS), or autoimmune polyendocrinopathy syndromes (APS), are rare genetic immune disorders.
• These syndromes involve inflammatory damage to endocrine glands, leading to malfunctions and potential non-endocrine autoimmune diseases.
• Heterogeneous symptoms and progressive disease onset often delay early diagnosis.

Purpose of the Study:

• To differentiate between the juvenile (Type 1) and adult (Type 2) forms of PGAS.
• To highlight the genetic basis and key clinical features of each PGAS type.
• To emphasize the importance of clinical suspicion for timely PGAS diagnosis.

Main Methods:

• Review of genetic causes, including AIRE gene mutations for Type 1 and HLA associations for Type 2.
• Analysis of distinct clinical manifestations differentiating PGAS Type 1 (candidiasis, Addison's, hypoparathyroidism) and Type 2 (Type 1 diabetes, thyroid disease, Addison's).
• Histopathological comparison with sporadic autoimmune diseases.

Main Results:

• PGAS Type 1, linked to AIRE gene mutations, presents with mucocutaneous candidiasis, Addison's disease, and hypoparathyroidism.
• PGAS Type 2, a multigenetic disorder with HLA associations, commonly features Type 1 diabetes, autoimmune thyroid disease, and Addison's disease, with female predominance.
• Histological findings in affected organs are similar to sporadic autoimmune diseases, lacking pathognomonic features.

Conclusions:

• PGAS comprises distinct juvenile and adult forms with different genetic underpinnings and clinical presentations.
• Recognizing autoimmune changes in multiple endocrine glands or history of autoimmune disorders is key for suspecting PGAS.
• Prompt clinical suspicion and informed diagnosis are vital for managing these complex autoimmune polyendocrinopathies.