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JOURNAL ARTICLE
REVIEW
Polyglandular autoimmune syndromes.
European Journal of Endocrinology 2009 July
The polyglandular autoimmune syndromes (PAS) comprise a wide spectrum of autoimmune disorders and are divided into a very rare juvenile (PAS type I) and a relatively common adult type with (PAS II) or without adrenal failure (PAS III). First clinical manifestation of PAS I usually occurs in childhood, whereas PAS II mostly occurs during the third and fourth decades. PAS I is caused by mutations in the autoimmune regulatory (AIRE) gene on chromosome 21 and is inherited in an autosomal recessive manner. Mutations in the AIRE gene result in defect proteins which cause autoimmune destruction of target organs by disturbing the immunological tolerance of the patients. Genetic testing may identify patients with PAS I, but not those with PAS II/III. For PAS II/III, susceptibility genes are known which increase the risk for developing autoimmune disorders, but must not be causative. These are certain HLA genes, the cytotoxic T lymphocyte antigen gene, and the protein tyrosine phosphatase non-receptor type 22 gene on chromosomes 6, 2 and 1 respectively. Actual diagnosis of PAS involves serological measurement of organ-specific autoantibodies and subsequent functional testing. Management of patients with PAS including their family relatives is best performed in centres with special expertise in autoimmune endocrine disorders.
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