Influence of candidate susceptibility genes on tuberculosis in a high endemic region.
Genetic susceptibility towards clinical tuberculosis has been proposed in several population studies. We investigated whether polymorphisms in the candidate genes encoding solute carrier 11a1 protein (SLC11A1 formerly NRAMP1), mannose-binding lectin (MBL2) and Vitamin D receptor (VDR) were associated with tuberculosis in an East-African setting. Four hundred and forty-three culture positive pulmonary tuberculosis patients and 426 controls from Mwanza district in the northern part of Tanzania were prospectively included. Polymorphisms in the candidate genes were detected by different PCR-based techniques. A significant association between pulmonary tuberculosis and a microsatellite marker in the 5'(CA)n locus in the SLC11A1 gene compared with controls (38% versus 30% odds ratio 1.45, 95% CI: 1.06-1.9, P=0.014) was observed. The association was apparent only in HIV negative tuberculosis patients. No association with tuberculosis was seen with 3 other SLC11A1 loci investigated, which previously have been associated with tuberculosis in other populations or with MBL2 and VDR polymorphisms. The tuberculosis associated microsatellite marker was situated on different SLC11A1 haplotypes. In this cohort a microsatellite marker in the 5'(CA)n locus situated in the SLC11A1 gene was associated with tuberculosis. The observed association was seen only in HIV negative patients suggesting that this genetic susceptibility for tuberculosis may be surpassed by co-infections.
Søborg
Christian
C
Tissue Typing Laboratory of the Department of Clinical Immunology, Rigshospitalet, Copenhagen, Denmark.
Andersen
Aase Bengaard
AB
Range
Nyagosya
N
Malenganisho
Wabyahe
W
Friis
Henrik
H
Magnussen
Pascal
P
Temu
Mansuet M
MM
Changalucha
John
J
Madsen
Hans O
HO
Garred
Peter
P
D000293:Adolescent; D000328:Adult; D000368:Aged; D000483:Alleles; D016022:Case-Control Studies; D027682:Cation Transport Proteins / Q000235:genetics; D003710:Demography; D005260:Female; D005796:Genes; D020022:Genetic Predisposition to Disease; D005838:Genotype; D018023:HIV Seronegativity / Q000235:genetics; D006801:Humans; D015810:Linkage Disequilibrium / Q000235:genetics; D008297:Male; D037601:Mannose-Binding Lectin / Q000235:genetics; D008875:Middle Aged; D020641:Polymorphism, Single Nucleotide / Q000235:genetics; D011401:Promoter Regions, Genetic / Q000235:genetics; D018167:Receptors, Calcitriol / Q000235:genetics; D013636:Tanzania / Q000453:epidemiology; D014376:Tuberculosis / Q000453:epidemiology* / Q000235:genetics*; D000099173:Natural Resistance-associated Macrophage Protein 1
D027682:Cation Transport Proteins; D037601:Mannose-Binding Lectin; D018167:Receptors, Calcitriol; D000099173:Natural Resistance-associated Macrophage Protein 1; C445619:MBL2 protein, human