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Clinical Chemistry and Laboratory Medicine (CCLM)

Published in Association with the European Federation of Clinical Chemistry and Laboratory Medicine (EFLM)

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Association of Polymorphisms in the Collagen Region of Human SP-A1 and SP-A2 Genes with Pulmonary Tuberculosis in Indian Population

Taruna Madan / Shweta Saxena / Kolluri J. R. Murthy / Kambadur Muralidhar / Puranam Usha Sarma

Citation Information: Clinical Chemistry and Laboratory Medicine. Volume 40, Issue 10, Pages 1002–1008, ISSN (Print) 1434-6621, DOI: 10.1515/CCLM.2002.174, June 2005

Publication History

Published Online:
2005-06-01

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-A2 gene showed significant association with pulmonary tuberculosis (number of patients = 17, number of controls = 19, p = 0.0000, OR = 8.94, 95% CI: 3.31<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.

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