title: Association between mannose-binding lectin gene polymorphisms and susceptibility to severe acute respiratory syndrome coronavirus infection.
abstract: BACKGROUND
  Genetic determinants of susceptibility to severe acute respiratory syndrome coronavirus (SARS-CoV) infection remain unknown. We assessed whether mannose-binding lectin (MBL) gene polymorphisms were associated with susceptibility to SARS-CoV infection or disease severity in an ethnically homogeneous population born in northern China.
  
  
  METHODS
  The frequencies of 1 mutation in codon 54 and 3 promoter polymorphisms at nt -550, -221, and 4 were ascertained in 352 patients with SARS and 392 control subjects, by means of polymerase chain reaction direct sequencing.
  
  
  RESULTS
  Of 352 patients with SARS and 392 control subjects, 120 (34.4%) and 91 (23.2%) were carriers of the codon 54 variant, respectively (odds ratio [OR], 1.73 [95% confidence interval {CI}, 1.25-2.39]; P=.00086). A total of 123 (36.0%) of 352 patients with SARS and 100 (25.5%) of 392 control subjects had haplotype pairs associated with medium or low expression of MBL (OR, 1.67 [95% CI, 1.21-2.29]; P=.00187). The population-attributable fraction of patients with SARS that was associated with having the codon 54 variant was 20.1% (95% CI, 7.9%-32.3%).
  
  
  CONCLUSIONS
  MBL gene polymorphisms were significantly associated with susceptibility to SARS-CoV infection; this might be explained by the reduced expression of functional MBL secondary to having the codon 54 variant.
authors.affiliation: Department of Genomics and Proteomics, Beijing Institute of Radiation Medicine, Chinese National Human Genome Center at Beijing, and Institute of Biophysics, Chinese Academy of Science, Beijing, China.
authors.forename: Hongxing
authors.initials: H
authors.lastname: Zhang
authors.forename: Gangqiao
authors.initials: G
authors.lastname: Zhou
authors.forename: Lianteng
authors.initials: L
authors.lastname: Zhi
authors.forename: Hao
authors.initials: H
authors.lastname: Yang
authors.forename: Yun
authors.initials: Y
authors.lastname: Zhai
authors.forename: Xiaojia
authors.initials: X
authors.lastname: Dong
authors.forename: Xiumei
authors.initials: X
authors.lastname: Zhang
authors.forename: Xue
authors.initials: X
authors.lastname: Gao
authors.forename: Yunping
authors.initials: Y
authors.lastname: Zhu
authors.forename: Fuchu
authors.initials: F
authors.lastname: He
mesh_terms: D000483:Alleles; D000818:Animals; D020022:Genetic Predisposition to Disease; D005838:Genotype; D037601:Mannose-Binding Lectin / Q000097:blood / Q000235:genetics*; D011110:Polymorphism, Genetic; D011485:Protein Binding; D045169:Severe Acute Respiratory Syndrome / Q000235:genetics* / Q000276:immunology
chemical_list: D037601:Mannose-Binding Lectin