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Manz, J. ; Rodriguez, E.* ; El Sharawy, A.* ; Oesau, E.M.* ; Petersen, B.S.* ; Baurecht, H.* ; Mayr, G.* ; Weber, S. ; Harder, J.* ; Reischl, E. ; Schwarz, A.* ; Novak, N.* ; Franke, A.* ; Weidinger, S.*

Targeted resequencing and functional testing identifies low-frequency missense variants in the gene encoding GARP as significant contributors to atopic dermatitis risk.

J. Invest. Dermatol. 136, 2380-2386 (2016)
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Gene mapping studies have consistently identified a susceptibility locus for atopic dermatitis and other inflammatory diseases on chromosome 11q13.5, with the strongest association observed for a common variant located in an intergenic region between the two annotated genes chromosome 11 open reading frame 30 (C11orf30) and leucine rich repeat containing 32 (LRRC32). Using a targeted resequencing approach we identified low-frequency and rare missense mutations within the LRRC32 gene encoding the glycoprotein A repetitions predominantly (GARP), a receptor on activated regulatory T cells that binds latent TGFβ. Subsequent association testing in more than 2,000 atopic dermatitis cases and 2,000 controls revealed a significant excess of these LRRC32 variants in individuals with atopic dermatitis. Structural protein modelling and bioinformatic analysis predicted a disruption of protein transport upon these variants, and overexpression assays in CD4(+)CD25(-) T cells showed a significant reduction in surface expression of the mutated protein. Consistently, flow cytometric (FACS) analyses of different T cell subtypes obtained from AD patients revealed a significantly reduced surface expression of GARP, and a reduced conversion of CD4(+)CD25(-) T cells into regulatory T cells along with lower expression of latency-associated protein (LAP) upon stimulation in carriers of the LRRC32 A407T variant. These results link inherited disturbances of TGFβ signalling with atopic dermatitis risk.
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Publication type Article: Journal article
Document type Scientific Article
Keywords Genome-wide Association; Susceptibility Loci; T-cells; Crohns-disease; Tgf-beta; Metaanalysis; Expression; Sensitization; Number; Asthma
ISSN (print) / ISBN 0022-202X
e-ISSN 1523-1747
Quellenangaben Volume: 136, Issue: 12, Pages: 2380-2386 Article Number: , Supplement: ,
Publisher Elsevier
Publishing Place New York, NY
Reviewing status Peer reviewed
Institute(s) Institute of Epidemiology II (EPI2)
Molekulare Endokrinologie und Metabolismus (MEM)