Killer cell immunoglobulin-like receptor gene-cluster 3DS1-2DL5-2DS1-2DS5 predisposes susceptibility to Vogt-Koyanagi-Harada syndrome in Japanese individuals

Ralph D Levinson, Annabelle A Okada, Elham Ashouri, Hiroshi Keino, Raja Rajalingam
Human Immunology 2010, 71 (2): 192-4
Killer cell immunoglobulin-like receptors (KIR) control the effector function of natural killer (NK) cells and subsets of T cell, and the genes encoding KIRs are substantially variable among individuals. A majority (58.4%) of Japanese individuals were found to be homozygous for group A KIR haplotypes that encode only a single activating KIR2DS4. Contrarily, most of Japanese patients with Vogt-Koyanagi-Harada (VKH) disease (69.2%), a panuveitis carry Bx genotypes that encode 2-5 activating KIR receptors. Particularly, individuals carrying three activating KIR genes 3DS1, 2DS1, and 2DS5 are more frequent in patient group compared with the controls (42.2% vs 21.4%, p = 0.02). In addition, the inhibitory KIR gene 3DL1 was significantly decreased in patients compared with controls (76.9% vs 98.8%, p = 0.00006). These data suggest that the genotypes encoding a dominant activating KIR receptor repertoire predispose susceptibility to VKH disease.

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