BACKGROUND: Although genetic analyses have identified the HLA-Cw*0602 allele as the major risk allele for chronic plaque psoriasis in various ethnic groups, it has been proposed that the association of Cw*0602 is due to linkage disequilibrium and that other nearby genes are involved in susceptibility to psoriasis. The psoriasis susceptibility 1 candidate 1 (PSORS1C1, formerly SEEK1) gene, located 127 kb telomeric to the HLA-C locus, is considered to be one of the potential candidate genes of psoriasis. Up to the present, no association study of the PSORS1C1 gene has been conducted on Chinese patients with psoriasis. OBJECTIVES: We aimed to determine whether the genetic polymorphisms of the PSORS1C1 gene were associated with an increased risk of psoriasis in Chinese patients. METHODS: We investigated the PSORS1C1 gene for disease association by direct sequencing of the PSORS1C1 gene in 143 Chinese patients with chronic plaque psoriasis and 188 control subjects. Genotyping for HLA-Cw*0602 and the alpha-helix coiled-coil rod homologue (C6orf18, formerly HCR) gene was also carried out using a sequence-based typing method. RESULTS: We identified 10 single nucleotide polymorphisms (SNPs) on the PSORS1C1 gene in our subjects; four of these SNPs cause amino acid change. We also detected poly(C) repeat variants from nucleotide positions 386-392 (poly(C)6-8). The poly(C) repeat polymorphisms cause a frame shift mutation. Another poly(C) repeat variant was also found at nucleotide positions 748-751. No significantly different allelic distributions of the PSORS1C1 SNPs or poly(C) repeat polymorphisms could be found between the patients with chronic plaque psoriasis and controls after correction for multiple testing. However, a significant increase of the Cw*0602 allele and tryptophan-tryptophan allele of the C6orf18 gene (HCR*WW) was found in patients with early onset psoriasis (21.9% vs. 4.8%, P < 10(-7)). Haplotype-based association analysis also showed a susceptibility haplotype carrying Cw*0602 and HCR*WW alleles in early onset Chinese patients. CONCLUSIONS: Our results indicate that the PSORS1C1 gene might not play an important role in the causation of chronic plaque psoriasis in Chinese people.
BACKGROUND: Although genetic analyses have identified the HLA-Cw*0602 allele as the major risk allele for chronic plaque psoriasis in various ethnic groups, it has been proposed that the association of Cw*0602 is due to linkage disequilibrium and that other nearby genes are involved in susceptibility to psoriasis. The psoriasis susceptibility 1 candidate 1 (PSORS1C1, formerly SEEK1) gene, located 127 kb telomeric to the HLA-C locus, is considered to be one of the potential candidate genes of psoriasis. Up to the present, no association study of the PSORS1C1 gene has been conducted on Chinese patients with psoriasis. OBJECTIVES: We aimed to determine whether the genetic polymorphisms of the PSORS1C1 gene were associated with an increased risk of psoriasis in Chinese patients. METHODS: We investigated the PSORS1C1 gene for disease association by direct sequencing of the PSORS1C1 gene in 143 Chinese patients with chronic plaque psoriasis and 188 control subjects. Genotyping for HLA-Cw*0602 and the alpha-helix coiled-coil rod homologue (C6orf18, formerly HCR) gene was also carried out using a sequence-based typing method. RESULTS: We identified 10 single nucleotide polymorphisms (SNPs) on the PSORS1C1 gene in our subjects; four of these SNPs cause amino acid change. We also detected poly(C) repeat variants from nucleotide positions 386-392 (poly(C)6-8). The poly(C) repeat polymorphisms cause a frame shift mutation. Another poly(C) repeat variant was also found at nucleotide positions 748-751. No significantly different allelic distributions of the PSORS1C1 SNPs or poly(C) repeat polymorphisms could be found between the patients with chronic plaque psoriasis and controls after correction for multiple testing. However, a significant increase of the Cw*0602 allele and tryptophan-tryptophan allele of the C6orf18 gene (HCR*WW) was found in patients with early onset psoriasis (21.9% vs. 4.8%, P < 10(-7)). Haplotype-based association analysis also showed a susceptibility haplotype carrying Cw*0602 and HCR*WW alleles in early onset Chinese patients. CONCLUSIONS: Our results indicate that the PSORS1C1 gene might not play an important role in the causation of chronic plaque psoriasis in Chinese people.
Authors: Rajan P Nair; Philip E Stuart; Ioana Nistor; Ravi Hiremagalore; Nicholas V C Chia; Stefan Jenisch; Michael Weichenthal; Gonçalo R Abecasis; Henry W Lim; Enno Christophers; John J Voorhees; James T Elder Journal: Am J Hum Genet Date: 2006-03-31 Impact factor: 11.025
Authors: C Ciccacci; P Conigliaro; C Perricone; S Rufini; P Triggianese; C Politi; G Novelli; R Perricone; P Borgiani Journal: Clin Exp Immunol Date: 2016-08-02 Impact factor: 4.330
Authors: Imre Semsei; Shannon Maier; Jennifer Workman-Azbill; László Urbán; Kathy Moser; Margit Zeher; Michael Bachmann; A Darise Farris Journal: Anal Biochem Date: 2007-07-05 Impact factor: 3.365
Authors: Alexander A Merleev; Alina I Marusina; Chelsea Ma; James T Elder; Lam C Tsoi; Siba P Raychaudhuri; Stephan Weidinger; Elizabeth A Wang; Iannis E Adamopoulos; Guillaume Luxardi; Johann E Gudjonsson; Michiko Shimoda; Emanual Maverakis Journal: JCI Insight Date: 2018-07-12
Authors: Rocío Prieto-Pérez; Guillermo Solano-López; Teresa Cabaleiro; Manuel Román; Dolores Ochoa; María Talegón; Ofelia Baniandrés; José Luis López-Estebaranz; Pablo de la Cueva; Esteban Daudén; Francisco Abad-Santos Journal: J Immunol Res Date: 2015-11-03 Impact factor: 4.818