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Targeted resequencing of candidate genes reveals novel variants associated with severe Behçet’s uveitis

2013; Springer Nature; Volume: 45; Issue: 10 Linguagem: Inglês

10.1038/emm.2013.101

2092-6413

Sang Jin Kim, Seungbok Lee, Chang‐Ho Park, Jeong‐Sun Seo, Jong‐Il Kim, Hyeong Gon Yu,

Retinal and Optic Conditions

Behçet's disease (BD) is a chronic systemic inflammatory disorder characterized by four major manifestations: recurrent uveitis, oral and genital ulcers and skin lesions. To identify some pathogenic variants associated with severe Behçet's uveitis, we used targeted and massively parallel sequencing methods to explore the genetic diversity of target regions. A solution-based target enrichment kit was designed to capture whole-exonic regions of 132 candidate genes. Using a multiplexing strategy, 32 samples from patients with a severe type of Behçet's uveitis were sequenced with a Genome Analyzer IIx. We compared the frequency of each variant with that of 59 normal Korean controls, and selected five rare and eight common single-nucleotide variants as the candidates for a replication study. The selected variants were genotyped in 61 cases and 320 controls and, as a result, two rare and seven common variants showed significant associations with severe Behçet's uveitis (P<0.05). Some of these, including rs199955684 in KIR3DL3, rs1801133 in MTHFR, rs1051790 in MICA and rs1051456 in KIR2DL4, were predicted to be damaging by either the PolyPhen-2 or SIFT prediction program. Variants on FCGR3A (rs396991) and ICAM1 (rs5498) have been previously reported as susceptibility loci of this disease, and those on IFNAR1, MTFHR and MICA also replicated the previous reports at the gene level. The KIR3DL3 and KIR2DL4 genes are novel susceptibility genes that have not been reported in association with BD. In conclusion, this study showed that target enrichment and next-generation sequencing technologies can provide valuable information on the genetic predisposition for Behçet's uveitis. A genetic investigation of Behçet's disease among individuals from Korea has revealed two previously unknown susceptibility genes and confirmed seven others. Behçet's disease is a multisystem inflammatory disorder common in the areas surrounding the old silk trading routes of the Middle East and Asia. It is characterized by mouth sores, genital lesions and eye inflammation. A team led by Jong-Il Kim and Hyeong Gon Yu of Seoul National University, South Korea, sequenced the protein-coding regions of 132 candidate genes in 32 people with Behçet's disease and 59 healthy controls. They then investigated 13 of the most promising genes using additional case and control subjects. The analysis identified two novel susceptibility variants in genes that encode 'killer-cell immunoglobulin-like receptors', cell surface proteins that regulate the activity of important immune cells known as natural killer cells.