Classic complement pathway component defects

Definition:

Complement disorders account for only 2 percent of all primary immunodeficiency disorders. They result from the disruption of one of the proteins involved in the classic or nonclassic activation pathways of the complement response. Defects in the classic pathway (CP) account for the more common type of complement deficiency, and are associated with increased risk to develop systemic lupus erythematosus (SLE) and SLE-like diseases. Homozygous C2 deficiency, which is the most frequent hereditary deficiency in complement classical pathway components, is associated with SLE in 10% of the cases. Complete C1q and C4 deficiencies are less frequent but associated with a higher prevalence of SLE.

References:

[1]. Arvind Kumar, et al. Current perspectives on primary immunodeficiency diseases. Clin Dev Immunol. 2006 Jun-Dec;13(2-4):223-59. [Content Brief]

[2]. Guillaume Bussone, et al. Autoimmune manifestations in primary immune deficiencies. Autoimmun Rev. 2009 Feb;8(4):332-6. [Content Brief]

[3]. Raif S Geha, et al. Primary immunodeficiency diseases: an update from the International Union of Immunological Societies Primary Immunodeficiency Diseases Classification Committee. J Allergy Clin Immunol. 2007 Oct;120(4):776-94. [Content Brief]

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