Human deficiencies in type 1 cytokine receptors reveal the essential role of type 1 cytokines in immunity to intracellular bacteria

Studies on patients with idiopathic, severe infections due to poorly pathog enic mycobacteria and Salmonella have revealed that many of these patients are unable to produce or respond to interferon-gamma (IFN-gamma). This inab ility results from causative, deleterious genetic mutations in either one o f four different genes in the type 1 cytokine cascade, encoding interleukin -12R beta1 (IL-12R beta1), IL-12p40, IFN-gamma R1 or IFN-gamma R2. The immu nological phenotypes resulting from the seven groups of complete or partial deficiencies in type 1 cytokine (receptor) genes that have been distinguis hed thus far will be summarized and discussed, and placed in a broader cont ext in relation to disease susceptibility. (C) 2000 Editions scientifiques et medicales Elsevier SAS.