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The contribution of coding variants to psoriasis much smaller than thought
Date:11/10/2013

nalysis, they discovered two independent missense SNVs in IL23R and GJB2 with low frequency and five common missense SNVs in LCE3D, ERAP1, CARD14 and ZNF816A associated with psoriasis at genome-wide significance. The rare missense SNVs in FUT2 and TARBP1 were also observed with suggestive evidence of association with this disease.

In addition to the SNVs analysis, researchers investigated 622 immune disease-related genes, and the results showed that the coding variants, at least common and low-frequency nonsynonymous variants, have limited independent contribution to psoriasis risk. Taking all the findings together, the study indicated that nonsynonymous SNVs in the 1,326 targeted genes had limited contribution to the overall genetic risk of psoriasis.

Compared with previous work on European population, this research also demonstrated the genetic heterogeneity between European and Chinese populations. The missense variant (rs72474224) in GJB2 seemed to be specific to Chinese individuals, while the one (rs11209026) in IL23R was specific to European individuals. And another common missense variant (rs11652075) in CARD14 showed consistent between European and Chinese samples.

Xin Jin, co-author of this study at BGI, said, "Target sequencing in such a large sample size enables us to investigate full spectrum of variants in these region. Although we did not identify any low-frequency or rare coding variants with strong genetic effect, the data helps us to refine several known GWAS loci and identify some candidate casual variants. It remains to be shown whether limited contribution of rare coding variants will also hold true for other regions outside the target and in other common diseases beyond psoriasis."


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Contact: Jia Liu
liujia@genomics.cn
BGI Shenzhen
Source:Eurekalert

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