title: Mannose binding lectin gene variants and susceptibility to tuberculosis in HIV-1 infected patients of South India.
abstract: Mannose binding lectin (MBL) plays an important role in innate immunity. Plasma MBL levels and MBL2 gene polymorphisms were studied in HIV-1 infected patients without tuberculosis (HIV+TB-) (n=151) and with tuberculosis (HIV+TB+) (n=109), HIV negative tuberculosis patients (HIV-TB+) (n=148) and healthy controls (n=146) by ELISA and genotyping by polymerase chain reaction based methods. MBL levels were significantly increased among HIV-TB+ and HIV+TB+ patients than controls and HIV+TB- patients (P<0.05). A significantly increased frequency of OO genotype of structural polymorphism and YY genotype of -221Y/X was observed among HIV-TB+ patients than controls. In HIV+TB+ patients, a significantly increased frequency of YA/YA diplotype (associated with very high MBL levels) was observed compared to controls (P=0.03). In HIV+TB+ patients, a significantly decreased frequency of medium MBL expression diplotypes (XA/XA and YA/YO) were noticed compared to HIV+TB- and healthy controls. The results suggest that YA/YA diplotype associated with very high MBL levels may predispose HIV-infected patients to tuberculosis while O/O genotype associated with very low MBL levels may be associated with susceptibility to tuberculosis in HIV uninfected individuals. Medium MBL expression diplotypes might protect against development of TB in HIV-infected patients.
authors.affiliation: Tuberculosis Research Centre, Indian Council of Medical Research, Mayor V.R. Ramanathan Road, Chetput, Chennai 600031, India.
authors.forename: Kalichamy
authors.initials: K
authors.lastname: Alagarasu
authors.forename: Paramasivam
authors.initials: P
authors.lastname: Selvaraj
authors.forename: Soumya
authors.initials: S
authors.lastname: Swaminathan
authors.forename: Sampathkumar
authors.initials: S
authors.lastname: Raghavan
authors.forename: Gopalan
authors.initials: G
authors.lastname: Narendran
authors.forename: Paranji R
authors.initials: PR
authors.lastname: Narayanan
mesh_terms: D017088:AIDS-Related Opportunistic Infections / Q000235:genetics* / Q000276:immunology; D000328:Adult; D005260:Female; D005787:Gene Frequency; D020022:Genetic Predisposition to Disease; D005838:Genotype; D015497:HIV-1; D006239:Haplotypes; D006801:Humans; D007113:Immunity, Innate; D008297:Male; D037601:Mannose-Binding Lectin / Q000097:blood / Q000235:genetics*; D008875:Middle Aged; D011110:Polymorphism, Genetic; D014376:Tuberculosis / Q000235:genetics* / Q000276:immunology; D014397:Tuberculosis, Pulmonary / Q000235:genetics / Q000276:immunology
chemical_list: C445619:MBL2 protein, human; D037601:Mannose-Binding Lectin