Alternative titles and symbols : Properdin p factor deficiency; Complement factor properdin deficiency; Properdin deficiency, type I; PFD;
Included titles and symbols : Properdin deficiency, type II; Properdin deficiency, type III;
Description : Properdin (factor P) is a plasma protein that is active in the alternative complement
pathway of the innate immune system. It is a positive regulatory factor that binds
to many microbial surfaces to stabilize the C3b,Bb convertase. Deficiency of properdin
is associated in particular with a heightened susceptibility to Neisseria species
(Janeway et al., 2001).;
Inheritance : X-linked recessive;
Molecular basis : Caused by mutations in the properdin P factor gene (PFC, 300383.0001);
Laboratory abnormalities : Deficiency of serum properdin P factor;