Autoimmune polyendocrine syndrome type 1

Autoimmune polyendocrine syndrome type 1 (APS-1), is a subtype of autoimmune polyendocrine syndrome (autoimmune polyglandular syndrome). It causes the dysfunction of multiple endocrine glands due to autoimmunity. It is a genetic disorder, inherited in autosomal recessive fashion due to a defect in the AIRE gene (autoimmune regulator), which is located on chromosome 21 and normally confers immune tolerance.[1][2][3]

Autoimmune polyendocrine syndrome type 1
Other namesAutoimmune polyendocrinopathy-candidiasis–ectodermal dystrophy/dysplasia (APECED),

Autoimmune polyglandular syndrome type 1, Whitaker syndrome,

Candidiasis-hypoparathyroidism–Addison's disease syndrome
Autoimmune polyendocrine syndrome type 1 is autosomal recessive
SpecialtyEndocrinology, medical genetics
Symptomschronic mucocutaneous candidiasis
Causesmutation in AIRE gene
Diagnostic methodCT scan, biopsy
Treatmenthormone therapy, antifungals, immunosuppression

Signs and symptoms

APS-1 tends to cause severe symptoms.[4] These are present from early in life, usually around 3.5 years of age.[4] Common symptoms of APS-1 include:

APS-1 may also cause:

Cause
Chromosome 21

APS-1 is caused by a mutation in the AIRE gene, encoding a protein called autoimmune regulator. This is found on the 21q22.3 chromosome location, hence chromosome 21.[1][2][6] The AIRE gene may be affected by any of at least 90 mutations. Mutations may be inherited in an autosomal recessive manner.

Different mutations are more common in different geographic regions. R139X is a common mutation in Sardinia.[4] R257* is a common mutation in Finland.[5]

Pathophysiology

APS-1 is due to problems with immune tolerance.[7] APS-1 causes considerable reactions with both interferon omega and interferon alpha.[4][8] There may also be a reaction against interleukin 22.[4] This leads to damage to endocrine organs.[4] Common problems include hypercalcaemia and nephrocalcinosis (due to a lack of calcitonin from the thyroid), and pituitary problems (such as growth hormone deficiency).[4] Antibodies against NLRP5 may lead to hypoparathyroidism.

Diagnosis
Endoscope

Diagnosis of APS-1 is based on a number of tests, including endoscopy, a CT scan,[8] a biopsy (with histological testing),[8] and serum endocrine autoantibody screening.

Treatment

Autoimmune polyendocrine syndrome type 1 treatment is based on the symptoms that are presented by the affected individual. Treatments may involve hormone therapy,[9] systemic antifungal treatments,[4][9] and immunosuppression.[9]

History

APS-1 may also be known as autoimmunity endocrinopathy candidiasis ectodermal dystrophy / dysplasia (APECED), autoimmune polyglandular syndrome type 1, Whitaker syndrome,[8] or candidiasis-hypoparathyroidism-Addison's disease syndrome.[10]

See also

References
  1. "AIRE gene". Genetics Home Reference. Retrieved 2017-04-04.
  2. "APECED". Retrieved 2017-04-04.
  3. Shoenfeld Y, Cervera R, Gershwin ME (2010-06-08). Diagnostic Criteria in Autoimmune Diseases. Springer Science & Business Media. p. 265. ISBN 9781603272858.
  4. Meloni, Antonella; Willcox, Nick; Meager, Anthony; Atzeni, Michela; Wolff, Anette S. B.; Husebye, Eystein S.; Furcas, Maria; Rosatelli, Maria Cristina; Cao, Antonio; Congia, Mauro (April 2012). "Autoimmune Polyendocrine Syndrome Type 1: An Extensive Longitudinal Study in Sardinian Patients". The Journal of Clinical Endocrinology & Metabolism. 97 (4): 1114–1124. doi:10.1210/jc.2011-2461. ISSN 0021-972X. PMID 22344197.
  5. Orlova, Elizaveta M; Sozaeva, Leila S; Kareva, Maria A; Oftedal, Bergithe E; Wolff, Anette S B; Breivik, Lars; Zakharova, Ekaterina Y; Ivanova, Olga N; Kämpe, Olle; Dedov, Ivan I; Knappskog, Per M (2017-07-20). "Expanding the Phenotypic and Genotypic Landscape of Autoimmune Polyendocrine Syndrome Type 1". The Journal of Clinical Endocrinology & Metabolism. 102 (9): 3546–3556. doi:10.1210/jc.2017-00139. ISSN 0021-972X. PMID 28911151. S2CID 3822560.
  6. "Autoimmune Polyglandular Syndrome Type 1 (APS-1)". NIH: National Institute of Allergy and Infectious Diseases. Retrieved 2017-04-16.
  7. De Martino L, Capalbo D, Improda N, D'Elia F, Di Mase R, D'Assante R, et al. (October 2013). "APECED: A Paradigm of Complex Interactions between Genetic Background and Susceptibility Factors". Frontiers in Immunology. 4: 331. doi:10.3389/fimmu.2013.00331. PMC 3805967. PMID 24167503.
  8. Aldasouqi, Saleh A. (15 November 2016). "Type I Polyglandular Autoimmune Syndrome". emedicine.medscape.com. Medscape. Archived from the original on 2008-12-09. Retrieved 20 November 2020.
  9. INSERM RESERVED. "Orphanet: Autoimmune polyendocrinopathy type 1". www.orpha.net. Retrieved 2017-04-22.
  10. Greenspan, F. S.; Gardner, D. C. (2004). Basic clinical endocrinology. New York: McGraw-Hill. pp. 103. ISBN 978-0-07-140297-2.

Further reading
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