IL-12Rβ1 deficiency: mutation update and description of the IL12RB1 variation database.

van de Vosse, Esther; Haverkamp, Margje H; Ramirez-Alejo, Noe; Martinez-Gallo, Mónica; Blancas-Galicia, Lizbeth; Metin, Ayşe; Garty, Ben Zion; Sun-Tan, Çağman; Broides, Arnon; de Paus, Roelof A; Keskin, Özlem; Çağdaş, Deniz; Tezcan, Ilhan; Lopez-Ruzafa, Encarna; Aróstegui, Juan I; Levy, Jacov; Espinosa-Rosales, Francisco J; Sanal, Özden; Santos-Argumedo, Leopoldo; Casanova, Jean-Laurent; Boisson-Dupuis, Stephanie; van Dissel, Jaap T; Bustamante, Jacinta

IL-12Rβ1 deficiency is an autosomal recessive disorder characterized by predisposition to recurrent and/or severe infections caused by otherwise poorly pathogenic mycobacteria and salmonella. IL-12Rβ1 is a receptor chain of both the IL-12 and the IL-23 receptor and deficiency of IL-12Rβ1 thus abolishes both IL-12 and IL-23 signaling. IL-12Rβ1 deficiency is caused by bi-allelic mutations in the IL12RB1 gene. Mutations resulting in premature stop codons, such as nonsense, frame shift, and splice site mutations, represent the majority of IL-12Rβ1 deficiency causing mutations (66%; 46/70). Also every other morbid mutation completely inactivates the IL-12Rβ1 protein. In addition to disease-causing mutations, rare and common variations with unknown functional effect have been reported in IL12RB1. All these variants have been deposited in the online IL12RB1 variation database (www.LOVD.nl/IL12RB1). In this article, we review the function of IL-12Rβ1 and molecular genetics of human IL12RB1.