title: Genetic polymorphisms of CCL2 associated with susceptibility to latent tuberculous infection in Thailand.
abstract: The extent to which individuals exhibit genetic susceptibility to tuberculosis (TB) is still unclear. Genetic variations in chemokine genes might influence the early clearance of Mycobacterium tuberculosis, affecting TB susceptibility.
  
  
  
  To study single nucleotide polymorphisms (SNPs) of chemokine genes CCL2, CXCL9, CXCL10 and CXCL11, and their association with TB susceptibility.
  
  
  
  Of 248 participants enrolled, 49 had active TB, 43 had latent tuberculous infection (LTBI) and 156 were non-infected, including 24 healthy controls with no known TB exposure. These populations were divided into two groups based on TB exposure: susceptible (n = 92) and resistant (early clearance) (n = 132).
  
  
  
  Only CCL2 SNPs (-2518A/G) were significantly associated with increased TB susceptibility. Based on adjusted multivariate analysis, persons with the GG genotype at this SNP were twice as susceptible to TB as those with the AA genotype (P = 0.018, OR 2.880, 95%CI 1.201-6.903). Risk of LTBI was three times higher among those with GG (P = 0.003, OR 3.358, 95%CI 1.525-7.396 for AA+AG vs. GG and P = 0.012, OR 3.706, 95%CI 1.340-10.254 for AA vs. GG). Persons with the GG genotype produced significantly lower CCL2 levels in response to M. tuberculosis antigen stimulation (AA+AG vs. GG, P = 0.038).
  
  
  
  The CCL2 polymorphism (-2518A/G) was associated with susceptibility to LTBI in a North-East Thai populations.
authors: Department of Microbiology, Khon Kaen University, Khon Kaen, Thailand.
authors: D
authors: D
authors: Nonghanphithak
authors: Department of Medicine, Faculty of Medicine, Khon Kaen University, Khon Kaen, Thailand; Research and Diagnostic Centre for Emerging Infectious Diseases, Khon Kaen University, Khon Kaen, Thailand.
authors: W
authors: W
authors: Reechaipichitkul
authors: Department of Microbiology, Khon Kaen University, Khon Kaen, Thailand; Research and Diagnostic Centre for Emerging Infectious Diseases, Khon Kaen University, Khon Kaen, Thailand.
authors: W
authors: W
authors: Namwat
authors: Department of Microbiology, Khon Kaen University, Khon Kaen, Thailand; Department of Research and Diagnostic Centre for Emerging Infectious Diseases, Khon Kaen University, Khon Kaen, Thailand.
authors: V
authors: V
authors: Lulitanond
authors: Nuffield Department of Medicine, University of Oxford, Oxford, UK.
authors: V
authors: V
authors: Naranbhai
authors: Department of Microbiology, Khon Kaen University, Khon Kaen, Thailand; Department of Research and Diagnostic Centre for Emerging Infectious Diseases, Khon Kaen University, Khon Kaen, Thailand.
authors: K
authors: K
authors: Faksri
mesh_terms: D000328:Adult; D000942:Antigens, Bacterial / Q000097:blood; D044466:Asian People / Q000235:genetics; D015992:Body Mass Index; D016022:Case-Control Studies; D018932:Chemokine CCL2 / Q000235:genetics*; D054357:Chemokine CXCL10 / Q000235:genetics; D054371:Chemokine CXCL11 / Q000235:genetics; D054370:Chemokine CXCL9 / Q000235:genetics; D005260:Female; D020022:Genetic Predisposition to Disease; D005838:Genotype; D006801:Humans; D055985:Latent Tuberculosis / Q000235:genetics*; D008297:Male; D008875:Middle Aged; D020641:Polymorphism, Single Nucleotide; D012307:Risk Factors; D013785:Thailand
chemical_list: D000942:Antigens, Bacterial; C111835:CCL2 protein, human; C114753:CXCL10 protein, human; C515202:CXCL11 protein, human; C080810:CXCL9 protein, human; D018932:Chemokine CCL2; D054357:Chemokine CXCL10; D054371:Chemokine CXCL11; D054370:Chemokine CXCL9; C072681:Mycobacterium tuberculosis antigens