title: Association of polymorphisms in the collagen region of human SP-A1 and SP-A2 genes with pulmonary tuberculosis in Indian population.
abstract: Surfactant protein A (SP-A) binds to and modulates phagocytosis of Mycobacterium tuberculosis by macrophages. We investigated the relationship between polymorphisms in the collagen regions of SP-A1 and SP-A2 genes and pulmonary tuberculosis. In the present study, seven single nucleotide polymorphisms (SNPs) (4 exonic and 3 intronic) have been identified in the collagen regions of SP-A1 and SP-A2 genes in Indian population. Two intronic polymorphisms, SP-A1C1416T ((p = 0.0000, odds ratio (OR) = 20.767,95% CI: 8.315-OR<51.870) and SP-A2C1382G (p = 0.0054; OR = 3.675, 95% CI: 1.400< OR<9.644), showed significant association with pulmonary tuberculosis (number of patients = 10, number of controls = 7). A redundant SNPA1660G of SP-A2gene showed significant association with pulmonary tuberculosis (number of patients = 17, number of controls = 19, p = 0.0000, OR = 8.94,95% CI: 3.311<OR<24.126). This polymorphism, when existing along with a non-redundant polymorphism, SP-A2G1649C (Ala91Pro) resulted in a stronger association with pulmonary tuberculosis (number of patients = 17, number of controls = 19, p = 0.000, OR = 16.3, 95% CI: 7.8644<OR<33.9244). The results indicated that these SNPs in the collagen region of SP-A2 may be one of the contributing factors to the genetic predisposition to pulmonary tuberculosis.
authors.affiliation: Molecular Biochemistry and Diagnostics, Centre for Biochemical Technology, Delhi, India.
authors.forename: Taruna
authors.initials: T
authors.lastname: Madan
authors.forename: Shweta
authors.initials: S
authors.lastname: Saxena
authors.forename: Kolluri J R
authors.initials: KJ
authors.lastname: Murthy
authors.forename: Kambadur
authors.initials: K
authors.lastname: Muralidhar
authors.forename: Puranam Usha
authors.initials: PU
authors.lastname: Sarma
mesh_terms: D000595:Amino Acid Sequence; D003094:Collagen / Q000235:genetics*; D005787:Gene Frequency; D020022:Genetic Predisposition to Disease; D006801:Humans; D007194:India; D008969:Molecular Sequence Data; D020641:Polymorphism, Single Nucleotide; D011401:Promoter Regions, Genetic; D037662:Pulmonary Surfactant-Associated Protein A / Q000031:analogs & derivatives* / Q000235:genetics*; D014397:Tuberculosis, Pulmonary / Q000235:genetics*
chemical_list: D037662:Pulmonary Surfactant-Associated Protein A; C445842:SFTPA1 protein, human; C445843:SFTPA2 protein, human; D003094:Collagen