title: P2X7 and NRAMP1/SLC11 A1 gene polymorphisms in Mexican mestizo patients with pulmonary tuberculosis.
abstract: Tuberculosis remains one of the most important infectious diseases worldwide. Several studies have suggested that genetic factors may affect susceptibility to tuberculosis, but the specific genes involved have not yet been fully characterized. NRAMP1/SLC11 A1 and P2X(7) genes have been linked to increased risk for tuberculosis in some African and Asiatic populations. To explore the potential role of these genes in the susceptibility to pulmonary tuberculosis in a Mexican mestizo population, we evaluated the association of D543N and 3'-UTR polymorphisms in NRAMP1/SLC11 A1 and - 762 and A1513C polymorphisms in P2X(7) genes with the risk for tuberculosis. Polymerase chain reaction (PCR) amplification of genomic DNA followed by restriction fragment length polymorphism analysis, and allelic-specific PCR was employed. We found no significant differences in allelic frequency in NRAMP1/SLC11 A1 gene polymorphisms in 94 patients with tuberculosis compared to 100 healthy contacts. Similarly, no significant association of the P2X(7)-762 gene polymorphism with tuberculosis was detected. In contrast, the P2X(7) A1513C polymorphism was associated significantly with tuberculosis (P = 0.02, odds ratio = 5.28, 95% CI, 0.99-37.69), an association that had not been reported previously. However, when the function of P2X(7) was assessed by an L-selectin loss assay, we did not find significant differences in patients compared to healthy contacts or between PPD(+) and PPD(-) control individuals. This study further supports the complex role of P2X(7) gene in host regulation of Mycobacterium tuberculosis infection, and demonstrates that different associations of gene polymorphisms and tuberculosis are found in distinct racial populations.
authors.affiliation: Dpto de Inmunología, Facultad de Medicina, Universidad Autónoma de San Luis Potosí, San Luis Potosí, México.
authors.forename: P
authors.initials: P
authors.lastname: Niño-Moreno
authors.forename: D
authors.initials: D
authors.lastname: Portales-Pérez
authors.forename: B
authors.initials: B
authors.lastname: Hernández-Castro
authors.forename: L
authors.initials: L
authors.lastname: Portales-Cervantes
authors.forename: V
authors.initials: V
authors.lastname: Flores-Meraz
authors.forename: L
authors.initials: L
authors.lastname: Baranda
authors.forename: A
authors.initials: A
authors.lastname: Gómez-Gómez
authors.forename: V
authors.initials: V
authors.lastname: Acuña-Alonzo
authors.forename: J
authors.initials: J
authors.lastname: Granados
authors.forename: R
authors.initials: R
authors.lastname: González-Amaro
mesh_terms: D016022:Case-Control Studies; D027682:Cation Transport Proteins / Q000097:blood / Q000235:genetics*; D005260:Female; D005787:Gene Frequency; D020022:Genetic Predisposition to Disease; D005838:Genotype; D006801:Humans; D019041:L-Selectin / Q000097:blood; D007963:Leukocytes, Mononuclear / Q000378:metabolism; D008297:Male; D016133:Polymerase Chain Reaction / Q000379:methods; D012150:Polymorphism, Restriction Fragment Length; D012333:RNA, Messenger / Q000235:genetics; D018048:Receptors, Purinergic P2 / Q000097:blood / Q000235:genetics* / Q000502:physiology; D058486:Receptors, Purinergic P2X7; D014397:Tuberculosis, Pulmonary / Q000097:blood / Q000235:genetics*; D000099173:Natural Resistance-associated Macrophage Protein 1
chemical_list: D027682:Cation Transport Proteins; D019041:L-Selectin; D012333:RNA, Messenger; D018048:Receptors, Purinergic P2; D058486:Receptors, Purinergic P2X7; D000099173:Natural Resistance-associated Macrophage Protein 1; C546468:P2RX7 protein, human