title: ERAP1 is associated with ankylosing spondylitis in Han Chinese.
abstract: OBJECTIVE
  Genetic components play important roles in the incidence and development of ankylosing spondylitis (AS). Aminopeptidase regulator of tumor necrosis factor receptor shedding 1 (ERAP1) was recently found to be associated with AS in North American and British cohorts. We evaluated whether ERAP1 is associated with AS in a Chinese Han population.
  
  
  METHODS
  A sample of 50 patients and 50 healthy controls was recruited for preliminary screening for informative single-nucleotide polymorphisms (SNP). Then 6 SNP of suggestive significance in the initial screening were followed up in a large sample of 471 patients with AS and 456 ethnically matched controls. Diagnosis of AS followed the 1984 modified New York criteria. Linkage disequilibrium coefficient (D' and r(2)) and haplotypes were estimated by Haploview. Result. Two SNP (rs27434, p = 0.00039, and rs27529, p = 0.0083) in ERAP1 other than that reported previously were found to be significantly associated with AS. Haplotype analysis using 5 SNP within 1 linkage disequilibrium block identified 2 risk haplotypes (GATGT and GACGT) and 1 protective haplotype (GGTGT) for AS.
  
  
  CONCLUSIONS
  Our study demonstrated that 2 novel SNP in ERAP1 were associated with AS in the Han Chinese population, suggesting that ERAP1 might confer genetic risk for AS in Han Chinese through the common mechanism shared by different populations, although the AS-associated SNP in ERAP1 might be population-specific.
authors.affiliation: Department of Rheumatology, Third Affiliated Hospital of Sun Yat-sen University, 600 Tianhe Road, Guangzhou 510630, China.
authors.forename: Chao
authors.initials: C
authors.lastname: Li
authors.forename: Zhiming
authors.initials: Z
authors.lastname: Lin
authors.forename: Yingying
authors.initials: Y
authors.lastname: Xie
authors.forename: Zishi
authors.initials: Z
authors.lastname: Guo
authors.forename: Jinxian
authors.initials: J
authors.lastname: Huang
authors.forename: Qiujing
authors.initials: Q
authors.lastname: Wei
authors.forename: Qiu Xia
authors.initials: QX
authors.lastname: Li
authors.forename: Xinwei
authors.initials: X
authors.lastname: Wang
authors.forename: Shuangyan
authors.initials: S
authors.lastname: Cao
authors.forename: Zetao
authors.initials: Z
authors.lastname: Liao
authors.forename: Manlong
authors.initials: M
authors.lastname: Xu
authors.forename: Yan
authors.initials: Y
authors.lastname: Shen
authors.forename: Jieruo
authors.initials: J
authors.lastname: Gu
mesh_terms: D000328:Adult; D000626:Aminopeptidases / Q000235:genetics*; D044466:Asian People / Q000235:genetics; D016022:Case-Control Studies; D005260:Female; D005787:Gene Frequency; D056726:Genetic Association Studies; D020022:Genetic Predisposition to Disease; D006239:Haplotypes; D006801:Humans; D016015:Logistic Models; D008297:Male; D015778:Minor Histocompatibility Antigens; D020641:Polymorphism, Single Nucleotide; D013167:Spondylitis, Ankylosing / Q000235:genetics*
chemical_list: D015778:Minor Histocompatibility Antigens; D000626:Aminopeptidases; C464841:ERAP1 protein, human