Genome-wide studies of psoriasis susceptibility loci: a review

Journal of Dermatological Science
Gurdeep S SagooRachid Tazi-Ahnini

Abstract

Psoriasis is a chronic inflammatory dermatosis affecting approximately 0.3-5% world-wide. Since 1997, nine genome-wide scans have been published in the search for predisposing genes to psoriasis and psoriatic arthritis. These genome-wide scans have provided results that both confirm earlier work, but which also suggest novel regions of interest on the genome. This article reviews the results of these genome-wide scans, in particular two novel regions on chromosomes 3p and 15p, and compares the study types and designs. The results in these two regions were compared in the different studies providing no further suggestive evidence, and we suggest that these results may be false-positives, population-specific susceptibility loci or due to the stratification used in the study design. We suggest stratifying the data into epidemiological subgroups in order to make the genome-wide scans more sensitive to loci specific to these subgroups. This approach could provide a much more powerful technique to study the genetics of a complex disease such as psoriasis.

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