Identification of CSK as a systemic sclerosis genetic risk factor through Genome Wide Association Study follow-up.
ABSTRACT Systemic sclerosis (SSc) is complex autoimmune disease affecting the connective tissue; influenced by genetic and environmental components. Recently, we performed the first successful genome-wide association study (GWAS) of SSc. Here, we perform a large replication study to better dissect the genetic component of SSc. We selected 768 polymorphisms from the previous GWAS and genotyped them in seven replication cohorts from Europe. Overall significance was calculated for replicated significant SNPs by meta-analysis of the replication cohorts and replication-GWAS cohorts (3237 cases and 6097 controls). Six SNPs in regions not previously associated with SSc were selected for validation in another five independent cohorts, up to a total of 5270 SSc patients and 8326 controls. We found evidence for replication and overall genome-wide significance for one novel SSc genetic risk locus: CSK [P-value = 5.04 × 10(-12), odds ratio (OR) = 1.20]. Additionally, we found suggestive association in the loci PSD3 (P-value = 3.18 × 10(-7), OR = 1.36) and NFKB1 (P-value = 1.03 × 10(-6), OR = 1.14). Additionally, we strengthened the evidence for previously confirmed associations. This study significantly increases the number of known putative genetic risk factors for SSc, including the genes CSK, PSD3 and NFKB1, and further confirms six previously described ones.
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ABSTRACT: Systemic sclerosis (SSc) is a complex systemic disease characterised by fibrosis of the skin and internal organs, vasculopathy, and activation of the immune system. The complex pathophysiology of SSc implies the potential involvement of 'culprit' genes, either individually or, more likely, together, in driving the disease process. Most of the studies that have provided evidence for the contribution of various genes/loci in SSc pathogenesis are based on a candidate gene approach, on the basis of a shared autoimmune genetic background with other autoimmune diseases, such as systemic lupus erythematosus. In fact, autoimmune genes seem to play a pivotal role in SSc pathogenesis, while less is known about the genetic involvement in vasculopathy and fibrosis. Recently, the availability of genome-wide association studies, which make it possible to screen single-nucleotide polymorphisms across the entire genome without previous knowledge of candidate regions or genes, has yielded a wealth of new genetic susceptibility loci leading to the identification of new pathogenetic mechanisms of complex genetic disorders. In this article, we aim to provide a comprehensive review of recent studies on the genetics of SSc, including genes associated with autoimmunity, fibrosis, and vascular disease. We also discuss the most relevant data obtained in genetic association studies of large populations that included a replication strategy, or studies for which independent replication was available.Clinical and experimental rheumatology 29(2 Suppl 65):S75-86. · 2.15 Impact Factor
Article: The genetics of scleroderma.[show abstract] [hide abstract]
ABSTRACT: The importance of the genetic component in the pathogenesis of scleroderma, or systemic sclerosis, has been strengthened in the past 2 years with studies on genetic markers-either candidate gene or genome-wide association studies--in large case-control series. Multiple genes have been consistently associated with susceptibility to scleroderma, and interestingly, several of them are involved in immune regulation. Because many of these genes are shared with other autoimmune diseases, a common underlying autoimmune mechanism has been proposed. The challenge that lies ahead is to confirm these associations and to find markers or pathways that are unique to scleroderma and that may define its distinctive phenotype.Current Rheumatology Reports 10/2010; 13(1):13-20.
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ABSTRACT: Recent advances have provided substantial insight into the maintenance of mucosal immunity and the pathogenesis of inflammatory bowel disease. Cellular programs responsible for intestinal homeostasis use diverse intracellular and intercellular networks to promote immune tolerance, inflammation or epithelial restitution. Complex interfaces integrate local host and microbial signals to activate appropriate effector programs selectively and even drive plasticity between these programs. In addition, genetic studies and mouse models have emphasized the role of genetic predispositions and how they affect interactions with microbial and environmental factors, leading to pro-colitogenic perturbations of the host-commensal relationship.Nature 06/2011; 474(7351):307-17. · 36.28 Impact Factor