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Polymorphisms in the C-type lectin genes cluster in chromosome 19 and predisposition to severe acute respiratory syndrome coronavirus (SARS-CoV) infection
  1. H Li1,2,3,4,
  2. N L-S Tang4,5,6,
  3. P K-S Chan7,8,
  4. C-Y Wang1,2,3,4,
  5. D S-C Hui8,9,
  6. C Luk6,
  7. R Kwok6,
  8. W Huang4,5,6,
  9. J J-Y Sung7,8,
  10. Q-P Kong1,2,4,
  11. Y-P Zhang1,2,4
  1. 1
    State Key Laboratory of Genetic Resources and Evolution, Kunming Institute of Zoology, Chinese Academy of Sciences, Kunming, China
  2. 2
    Laboratory for Conservation and Utilization of Bio-resource, Yunnan University, Kunming, China
  3. 3
    Graduate University of the Chinese Academy of Sciences, Beijing, China
  4. 4
    KIZ/CUHK Joint Laboratory of Bioresources and Molecular Research in Common Diseases, Kunming, China
  5. 5
    Li Ka Shing Institute of Health Sciences, The Chinese University of Hong Kong, Hong Kong, China
  6. 6
    Departments of Chemical Pathology, Faculty of Medicine, The Chinese University of Hong Kong, Hong Kong, China
  7. 7
    Departments of Microbiology, The Chinese University of Hong Kong, Hong Kong, China
  8. 8
    Stanley Ho Centre for Emerging Infectious Diseases, The Chinese University of Hong Kong, Hong Kong, China
  9. 9
    Departments of Medicine & Therapeutics, The Chinese University of Hong Kong, Hong Kong, China
  1. Professor Y-P Zhang, State Key Laboratory of Genetic Resources and Evolution, Kunming Institute of Zoology, Chinese Academy of Sciences, Kunming 650223, China; zhangyp1{at}263.net.cn

Abstract

Background: Polymorphisms of CLEC4M have been associated with predisposition for infection by the severe acute respiratory syndrome coronavirus (SARS-CoV). DC-SIGNR, a C-type lectin encoded by CLEC4M, is a receptor for the virus. A variable number tandem repeat (VNTR) polymorphism in its neck region was recently associated with susceptibility to SARS infection. However, this association was controversial and was not supported by subsequent studies. Two explanations may account for this discrepancy: (1) there may be an unknown predisposition polymorphism located in the proximity which is linked to the VNTR; or (2) it was a spurious association due to unrecognised population structure in the VNTR.

Methods: We performed a comprehensively genetic association study on this C-type lectin gene cluster (FCER2, CLEC4G, CD209, and CLEC4M) at 19p13.3 by a tagging single nucleotide polymorphisms (SNPs) approach.

Results: 23 tagSNPs were genotyped in 181 SARS patients and 172 population controls. No significant association with disease predisposition was detected. Genetic variations in this cluster also did not predict disease prognosis. However, we detected a population stratification of the VNTR alleles in a sample of 1145 Han Chinese collected from different parts of China.

Conclusion: The results indicated that the genetic predisposition allele was not found in this lectin gene cluster and population stratification might cause the previous positive association.

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Footnotes

  • Competing interests: None declared.

  • Funding: This work was supported by grants the National Natural Science Foundation of China (30621092), Bureau of Science and Technology of Yunnan Province and a Direct grant from the Faculty of Medicine, The Chinese University of Hong Kong (2007.1.019).

  • Patient consent: Obtained

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