Thus, from these studies has appeared a functional link between IL-7, IL-7R, and SOCS1 in the regulation and homeostasis of Th17/Th1/Treg cells of relevance to autoimmunity, which seems to be vindicated by the identification of hard-wired polymorphisms in the 3 corresponding gene loci that act as susceptibility factors for MS (Zuvich and others2010; Vandenbroeck and others2011)

Thus, from these studies has appeared a functional link between IL-7, IL-7R, and SOCS1 in the regulation and homeostasis of Th17/Th1/Treg cells of relevance to autoimmunity, which seems to be vindicated by the identification of hard-wired polymorphisms in the 3 corresponding gene loci that act as susceptibility factors for MS (Zuvich and others2010; Vandenbroeck and others2011). composition of associated haplotypes differs from one disease to another and will not be discussed in this review. While theHLAregion explains a significant portion of the associated genetic risk, identification of additional non-HLA risk factors has posed major challenges. The approaches to track down such factors range from candidate gene studies to genome-wide association studies (GWAS). Candidate genes are defined as genes of which the products are likely to play a role in the etiopathogenesis of the disease based on immunological or biological knowledge. GWAS, in contrast, are agnostic, that is, model independent, in view of the fact that they cover the full genome thus avoiding gene selection bias. Cytokine and cytokine receptor genes have traditionally attracted great interest as candidate genes for autoimmune diseases (see Vandenbroeck2006). This interest was largely driven by the finding that it was possible to significantly alter disease outcome in animal models of autoimmune disease by means of either monoclonal antibodies against specific cytokines, administration of recombinant cytokines, or silencing of cytokine genes, and numerous examples of such successful interventions are available in the scientific literature. In 2007, the first GWAS in autoimmune diseases were published, and these revealed for the first time the real genetic size effects of non-HLA risk factors. What emerged was the finding that non-HLA risk factors have weak-to-modest effects, with odds ratios rarely exceeding 1.3. To robustly validate these genes with genome-wide significance (normally set atP=107), huge sample collections of carefully ascertained patients and controls are needed. With the benefit of hindsight, we now know that most pre-GWAS cytokine candidate gene studies did WIKI4 not have sufficient statistical power to reliably determine whether or not cytokine genes were autoimmune risk factors as the required thresholds for genome-wide significance were only very rarely met. Even if successful, the genomic context of multiple associated loci cannot be ascertained by candidate gene studies. It should therefore not surprise that more than candidate gene studies, it is the GWAS approach that has facilitated the robust identification of those cytokine/receptor gene loci that act as clear-cut genetic risk factors for autoimmune disease. The aim of this review was to examine cytokine/receptor loci that have emerged as autoimmune risk factors mainly from GWAS but also, wherever relevant, from well-powered candidate gene studies performed after 2007 (Table 1,Figure 1). Cytokine/receptor loci emerging from GWAS were recognized via the NHGRI GWAS catalog by means of the GWAS Integrator bioinformatics tool (Hindorff and Rabbit Polyclonal to CaMK2-beta/gamma/delta others2009; Yu and others2011). A total of 17 autoimmune diseases were surveyed (Number 1), that is, alopecia areata (AA), ankylosing spondylitis (AS), asthma, atopic dermatitis, Behet’s disease (BD), celiac disease (CeD), crohn’s disease (CD), graves’ disease (GD), multiple sclerosis (MS), main biliary cirrosis (PBC), psoriasis, psoriatic arthritis, rheumatoid arthritis (RA), systemic lupus erythematosus (SLE), type 1 diabetes (T1D), ulcerative colitis (UC), and vitiligo.Number 1provides a snapshot of a rapidly changing panorama of identified interleukin and chemokine (receptor) genes and users of the TNF receptor and ligand superfamily. Actually if the practical implications of most of these associations are not yet clarified, we are beginning to understand the mechanisms by which connected polymorphisms in interleukin-2 receptor alpha (IL2RA),IL7R, cytokines belonging to theIL12family, andIL10may impact immune rules in autoimmune disease. This review efforts to format these emerging ideas. == Table 1. == Most Frequently Shared and Validated Autoimmune DiseaseAssociated Interleukin (Receptor) Gene Loci Identified in WIKI4 Genome-Wide Association Studies Included are only bona fide interleukin genes and their receptors. Studies were selected from your NHGRI Catalog of Published GWAS, and from additional published GWAS. For loci that emerged more than once from self-employed GWAS on the same disease, only one representative study is included. Pediatric onset form of the disease. AA, alopecia areata; AS, ankylosing spondylitis; BD, Behet’s disease; CD, Crohn’s disease; IBD, inflammatory bowel disease; WIKI4 MS, multiple sclerosis; PBC, main biliary cirrhosis; Ps, psoriasis; PsA, psoriatic arthritis; RA, rheumatoid arthritis; T1D, type.