title: Mannose-binding lectin exon 1 and promoter polymorphisms in tuberculosis disease in a Mediterranean area.
abstract: Mannose-binding lectin (MBL) is a serum protein that activates the complement and mediates phagocytosis. MBL levels and MBL2 genotype may impact upon host susceptibility to tuberculosis (TB) disease but evidence to date has been conflicting. MBL2 exon 1 and promoter genotyping and serum MBL concentrations were determined in 79 patients with active tuberculosis (58 pulmonary TB and 21 extrapulmonary or miliary TB) and 120 household healthy contacts (HHC) from a Mediterranean area (Majorca Island, Spain). Significantly higher serum MBL levels were found in patients with active tuberculosis than in HHC [median MBL concentrations 3430 ng mL(-1) (10-28 415) and 2600 ng mL(-1) (5-20 000) respectively, P = 0.002]. These higher MBL levels were mainly related to the most prevalent YA/YA wild-type diplotype. There was a strong correlation between MBL2 exon 1 and promoter genotype and MBL levels. The diplotype LYQA/HYPA was present in 12 out of 57 of the pulmonary TB cases but in none of the extrapulmonary TB patients. Diplotype LXPA/HYPA, producer of high levels of MBL, was significantly more frequent in HHC than in patients (16.8% vs. 6.4%, P = 0.031) suggesting a protective role against the development of TB disease that has not been previously found.
authors.affiliation: Internal Medicine/Infectious Diseases Department, Son LLàtzer Hospital, Palma de Mallorca, Spain.
authors.forename: M
authors.initials: M
authors.lastname: García-Gasalla
authors.forename: J
authors.initials: J
authors.lastname: Milá Llambí
authors.forename: I
authors.initials: I
authors.lastname: Losada-López
authors.forename: C
authors.initials: C
authors.lastname: Cifuentes-Luna
authors.forename: V
authors.initials: V
authors.lastname: Fernández-Baca
authors.forename: A
authors.initials: A
authors.lastname: Pareja-Bezares
authors.forename: I
authors.initials: I
authors.lastname: Mir-Villadrich
authors.forename: A
authors.initials: A
authors.lastname: Payeras-Cifré
mesh_terms: D000293:Adolescent; D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D005091:Exons / Q000235:genetics*; D005260:Female; D005787:Gene Frequency; D020022:Genetic Predisposition to Disease / Q000235:genetics*; D005838:Genotype; D006239:Haplotypes; D006801:Humans; D008297:Male; D037601:Mannose-Binding Lectin / Q000097:blood / Q000235:genetics*; D008521:Mediterranean Islands; D008875:Middle Aged; D020641:Polymorphism, Single Nucleotide; D011401:Promoter Regions, Genetic / Q000235:genetics*; D013030:Spain; D014376:Tuberculosis / Q000097:blood / Q000235:genetics*; D014397:Tuberculosis, Pulmonary / Q000097:blood / Q000235:genetics; D055815:Young Adult
chemical_list: C445619:MBL2 protein, human; D037601:Mannose-Binding Lectin