title: Replication of the association of the aspartic acid repeat polymorphism in the asporin gene with knee-osteoarthritis susceptibility in Han Chinese.
abstract: A genetic association of osteoarthritis (OA) and functional polymorphisms in the aspartic acid (D) repeat of the asporin gene was reported in Japanese and European Caucasians; however, the results were controversial. Our objective was to evaluate whether the D repeat polymorphism was associated with knee OA in Han Chinese. The D repeat polymorphism was genotyped in 218 patients who suffered from primary symptomatic knee OA with radiographic confirmation and in 454 age-matched controls, and the allelic association of the repeat was examined. Frequencies of the D13 and D14 alleles were similar to those of Japanese, but different from those of European Caucasians. The D14 allele was significantly over-represented in knee OA patients (P=0.0013; odds ratio 2.04; 95% confidence interval 1.32-3.15). D14 was more frequent in early-onset patients than in late-onset patients (P=0.043) and the age at onset in patients with D14 was earlier (P=0.028; log-rank test). Thus, the association of the D14 allele with knee OA susceptibility was replicated in Han Chinese. This was the first instance that association of the OA susceptibility gene was definitely replicated between different ethnic groups.
authors.affiliation: The Center of Diagnosis and Treatment for Joint Disease, Drum Tower Hospital Affiliated to Medical School of Nanjing University, Zhongshan Road 321, Nanjing, 210008, Jiangsu, China. qingj@nju.edu.cn.
authors.forename: Qing
authors.initials: Q
authors.lastname: Jiang
authors.affiliation: The Center of Diagnosis and Treatment for Joint Disease, Drum Tower Hospital Affiliated to Medical School of Nanjing University, Zhongshan Road 321, Nanjing, 210008, Jiangsu, China.
authors.forename: Dongquan
authors.initials: D
authors.lastname: Shi
authors.affiliation: Department of Pathology, Medical School of Nanjing University, Nanjing, China.
authors.forename: Long
authors.initials: L
authors.lastname: Yi
authors.affiliation: Laboratory for Bone and Joint Diseases, SNP Research Center, RIKEN, Tokyo, Japan.
authors.forename: Shiro
authors.initials: S
authors.lastname: Ikegawa
authors.affiliation: Department of Pathology, Medical School of Nanjing University, Nanjing, China.
authors.forename: Yong
authors.initials: Y
authors.lastname: Wang
authors.affiliation: Laboratory for Statistical Analysis, SNP Research Center, RIKEN, Tokyo, Japan.
authors.forename: Takahiro
authors.initials: T
authors.lastname: Nakamura
authors.affiliation: Department of Pathology, Medical School of Nanjing University, Nanjing, China.
authors.forename: Di
authors.initials: D
authors.lastname: Qiao
authors.affiliation: The Center of Diagnosis and Treatment for Joint Disease, Drum Tower Hospital Affiliated to Medical School of Nanjing University, Zhongshan Road 321, Nanjing, 210008, Jiangsu, China.
authors.forename: Cheng
authors.initials: C
authors.lastname: Liu
authors.affiliation: The Center of Diagnosis and Treatment for Joint Disease, Drum Tower Hospital Affiliated to Medical School of Nanjing University, Zhongshan Road 321, Nanjing, 210008, Jiangsu, China.
authors.forename: Jin
authors.initials: J
authors.lastname: Dai
mesh_terms: D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D044466:Asian People / Q000235:genetics*; D001224:Aspartic Acid / Q000235:genetics*; D002681:China / Q000208:ethnology; D016326:Extracellular Matrix Proteins / Q000235:genetics*; D005260:Female; D005787:Gene Frequency; D020022:Genetic Predisposition to Disease; D005838:Genotype; D006801:Humans; D008297:Male; D008875:Middle Aged; D018598:Minisatellite Repeats; D020370:Osteoarthritis, Knee / Q000208:ethnology / Q000235:genetics*; D011110:Polymorphism, Genetic
chemical_list: C439889:ASPN protein, human; D016326:Extracellular Matrix Proteins; D001224:Aspartic Acid