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Chen, H.; Common, J.E.A.; Haines, R.L.; Balakrishnan, A.; Brown, S.J.; Goh, C.S.M.; Cordell, H.J.; Sandilands, A.; Campbell, L.E.; Kroboth, K.; Irvine, A.D.; Goh, D.L.M.; Tang, M.B.Y.; van Bever, H.P.; Giam, Y.C.; McLean, W.H.I.; Lane, E.B.
British journal of dermatology (1951), July 2011, Volume: 165, Issue: 1Journal Article
Summary Background Null mutations in the filaggrin gene (FLG) cause ichthyosis vulgaris (IV) and predispose to atopic dermatitis (AD). Cohort studies in Europe and Japan have reported an FLG mutation carrier frequency of between 14% and 56%, but the prevalent European FLG mutations are rare or absent in Chinese patients with IV and AD. Objectives To investigate further the spectrum of FLG‐null mutations in Chinese patients and to compare it with that in other populations. Methods We conducted comprehensive FLG genetic analysis in a discovery cohort of 92 Singaporean Chinese individuals with IV and/or moderate‐to‐severe AD. All detected FLG mutations were then screened in a cohort of 425 patients with AD and 440 normal controls. Results In total, 22 FLG‐null mutations, of which 14 are novel, were identified in this study; the combined null FLG genotype of 17 mutations detected in cases and controls showed strong association with AD Fisher’s exact test; P = 5·3 × 10−9; odds ratio (OR) 3·3, palmar hyperlinearity (Fisher’s exact test; P = 9·0 × 10−15; OR 5·8), keratosis pilaris (Fisher’s exact test; P = 0·001; OR 4·7) and with increased severity of AD (permutation test; P = 0·0063). Conclusions This study emphasizes the wider genetic landscape of FLG‐null mutations in Asia that is slowly emerging.
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