What is autoimmunity?
Autoimmunity happens when the body starts to attack its own tissues and organs. It is caused by changes in how the immune system works. The immune system simply stops recognising the difference between what is ‘self’ (auto – meaning belonging to the body) and shouldn’t be attacked, and foreign organisms that should be.
The effects of this autoimmune attack are inflammation and damage to the tissues of the body. This can include damage to the upper airways, lungs, joints, nervous system, liver, gut, thyroid gland, blood cells and indeed any tissue or organ.
How does this happen?
It is due to an overactive, faulty immune system. The immune system starts to produce white blood cells or antibodies that react against particular markers in certain tissues or organs. This is known as ‘organ-specific’ autoimmune disease. Or, sometimes, antibodies are produced against markers spread throughout the body in many tissues or organs. This is known as ‘non-organ specific’ autoimmune disease.
Which PIDs are particularly associated with autoimmune complications?
The primary immunodeficiencies (PIDs) most often associated with the development of autoimmunity are:
- common variable immune deficiency (CVID)
- IgA deficiency
- Wiskott–Aldrich syndrome
- Good syndrome
- hyper IgM syndrome
- complement component deficiencies.
In some kinds of PIDs, autoimmune disease is a central and principal part of the condition. These types of PIDs include:
- autoimmune lymphoproliferative syndrome (ALPS)
- immune dysregulation + polyendocrinopathy + enteropathy + X-linked inheritance (IPEX) syndrome
- autoimmune polyendocrinopathy + candidiasis + ectodermal dysplasia (APECED) syndrome.
What autoimmune diseases are associated with PIDs?
Different ‘organ-specific’ and ‘non-organ specific’ autoimmune diseases are associated with PIDs. These include:
This page was reviewed by the Medical Advisory Panel, April 2018.