title: An evaluation of the performance of HapMap SNP data in a Shanghai Chinese population: analyses of allele frequency, linkage disequilibrium pattern and tagging SNPs transferability on chromosome 1q21-q25.
abstract: BACKGROUND
  The HapMap project aimed to catalog millions of common single nucleotide polymorphisms (SNPs) in the human genome in four major populations, in order to facilitate association studies of complex diseases. To examine the transferability of Han Chinese in Beijing HapMap data to the Southern Han Chinese in Shanghai, we performed comparative analyses between genotypes from over 4,500 SNPs in a 21 Mb region on chromosome 1q21-q25 in 80 unrelated Shanghai Chinese and 45 HapMap Chinese data.
  
  
  RESULTS
  Three thousand and forty-two SNPs were analyzed after removal of SNPs that failed quality control and those not in the HapMap panel. We compared the allele frequency distributions, linkage disequilibrium patterns, haplotype frequency distributions and tagging SNP sets transferability between the HapMap population and Shanghai Chinese population. Among the four HapMap populations, Beijing Chinese showed the best correlation with Shanghai population on allele frequencies, linkage disequilibrium and haplotype frequencies. Tagging SNP sets selected from four HapMap populations at different thresholds were evaluated in the Shanghai sample. Under the threshold of r2 equal to 0.8 or 0.5, both HapMap Chinese and Japanese data showed better coverage and tagging efficiency than Caucasian and African data.
  
  
  CONCLUSIONS
  Our study supported the applicability of HapMap Beijing Chinese SNP data to the study of complex diseases among southern Chinese population.
authors.affiliation: Shanghai Diabetes Institute, Department of Endocrinology and Metabolism, Shanghai Jiao Tong University Affiliated Sixth People's Hospital, 600 Yishan Road, Shanghai, 200233, China. alfredhc@sjtu.edu.cn
authors.forename: Cheng
authors.initials: C
authors.lastname: Hu
authors.forename: Weiping
authors.initials: W
authors.lastname: Jia
authors.forename: Weihua
authors.initials: W
authors.lastname: Zhang
authors.forename: Congrong
authors.initials: C
authors.lastname: Wang
authors.forename: Rong
authors.initials: R
authors.lastname: Zhang
authors.forename: Jie
authors.initials: J
authors.lastname: Wang
authors.forename: Xiaojing
authors.initials: X
authors.lastname: Ma
authors.forename: Kunsan
authors.initials: K
authors.lastname: Xiang
mesh_terms: D044466:Asian People / Q000235:genetics*; D002681:China; D002874:Chromosome Mapping; D002878:Chromosomes, Human, Pair 1 / Q000235:genetics*; D005787:Gene Frequency; D020022:Genetic Predisposition to Disease / Q000235:genetics*; D023281:Genomics; D006801:Humans; D015810:Linkage Disequilibrium; D020641:Polymorphism, Single Nucleotide