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Assessment of rosacea symptom severity by genome-wide association study and expression analysis highlights immuno-inflammatory and skin pigmentation genes.

Hum Mol Genet. 2018 May 16;:

Authors: Aponte JL, Chiano MN, Yerges-Armstrong LM, Hinds DA, Tian C, Gupta A, Guo C, Fraser DJ, Freudenberg JM, Rajpal DK, Ehm MG, Waterworth DM

Abstract
Rosacea is a common, chronic skin disease of variable severity with limited treatment options. The cause of rosacea is unknown, but it is believed to be due to a combination of hereditary and environmental factors. Little is known about the genetics of the disease. We performed a genome-wide association study (GWAS) of rosacea symptom severity with data from 73,265 research participants of European ancestry from the 23andMe customer base. Seven loci had variants associated with rosacea at the genome-wide significance level (p≤5 × 10-8). Further analyses highlighted likely gene regions or effector genes including IRF4 (p=1.5 × 10-17), an HLA region flanked by PSMB9 and HLA-DMB (p=2.2 × 10-15), HERC2-OCA2 (p=4.2 × 10-12), SLC45A2 (p=1.7 × 10-10), IL13 (p=2.8 × 10-09), a region flanked by NRXN3 and DIO2 (p=4.1 × 10-9), and a region flanked by OVOL1and SNX32 (p=1.2 × 10-8). All associations with rosacea were novel except for the HLA locus. Two of these loci (HERC-OCA2, SLC45A2) and another precedented variant (rs1805007 in MC1R) with an association p value just below the significance threshold (p=1.3 × 10-7) have been previously associated with skin phenotypes and pigmentation, two of these loci are linked to immuno-inflammation phenotypes (IL13, PSMB9-HLA-DMA) and one has been associated with both categories (IRF4). Genes within three loci (PSMB9-HLA-DMA, HERC-OCA2, and NRX3-DIO2) were differentially expressed in a previously published clinical rosacea transcriptomics study that compared lesional to non-lesional samples. The identified loci provide specificity of inflammatory mechanisms in rosacea, and identify potential pathways for therapeutic intervention.

PMID: 29771307 [PubMed - as supplied by publisher]

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