title: [Analysis of HLA haplotype frequency and linkage disequilibrium in patients with acute lymphoblastic leukemia from Northern Chinese Han].
abstract: OBJECTIVE
  To analyze the difference between the frequencies of HLA-A-B, B-DRB1 and A-B-DRB1 haplotype, as well as their linkage disequilibrium pattern in patients with acute lymphoblastic leukemia(ALL) and healthy controls from Northern Chinese Han.
  
  
  METHODS
  The frequencies of HLA-A-B, B-DRB1, A-B-DR haplotypes and linkage disequilibrium were estimated by Expectation Maximization method based on the genotypes of 643 patients with ALL and 2 0359 unrelated healthy donors, and the statistical significance between the two groups were estimated by chi-square test. Linkage disequilibrium was analyzed with population genetic methods.
  
  
  RESULTS
  The most common HLA-A-B, B-DRB1, and A-B-DR haplotypes were A30-B13, A2-B46, A33-B58, B13-DR7, B46-DR9, B52-DR15, B58-DR17, A30-B13-DR7, A33-B58-DR17 and A1-B37-DR10 in both groups. The frequencies of A30-B13, A2-B46, A33-B44, B13-DR7, A30-B13-DR7 and A2-B46-DR9 haplotypes and linkage disequilibrium value were significantly decreased (P<0.05) in the patient group than that in the control group. On the other hand, the frequencies of A2-B52, A31-B61, A24- B8, B60-DR9, B27-DR4, B52-DR14, B44-DR17, B27-DR12 and A11-B27-DR12 haplotypes and linkage disequilibrium value were significantly increased (P<0.05) in the patient group than that in the control group.
  
  
  CONCLUSIONS
  There are some common and positive linkage disequilibrium haplotypes in both the ALL patients and the healthy donors in Northern Chinese Han. Interestingly, some haplotypes and their linkage disequilibrium patterns had significantly different distributions between the two groups. The study provided basic data for the relationship of ALL and HLA haplotype and for finding the HLA-A, B, DR matching donors.
authors.affiliation: Shenzhen Blood Center Institute, Shenzhen HLA Laboratory of Chinese Marrow Donor Program, Shenzhen, Guangdong, 518035 PR China. suqinggao@yahoo.com.cn
authors.forename: Su-qing
authors.initials: SQ
authors.lastname: Gao
authors.forename: Liang-hong
authors.initials: LH
authors.lastname: Cheng
authors.forename: Liang
authors.initials: L
authors.lastname: Lu
authors.forename: Shi-zheng
authors.initials: SZ
authors.lastname: Jing
authors.forename: Xi
authors.initials: X
authors.lastname: Cheng
authors.forename: Yin-ze
authors.initials: YZ
authors.lastname: Zhang
authors.forename: Hong-yan
authors.initials: HY
authors.lastname: Zou
authors.forename: Zhi-hui
authors.initials: ZH
authors.lastname: Deng
mesh_terms: D044466:Asian People / Q000235:genetics*; D016022:Case-Control Studies; D002681:China; D005006:Ethnicity / Q000235:genetics*; D005260:Female; D006680:HLA Antigens / Q000235:genetics*; D006239:Haplotypes; D006801:Humans; D015810:Linkage Disequilibrium; D008297:Male; D054198:Precursor Cell Lymphoblastic Leukemia-Lymphoma / Q000235:genetics*; D055815:Young Adult
chemical_list: D006680:HLA Antigens