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Association of functional mutant homozygotes of the mannose binding protein gene with susceptibility to pulmonary tuberculosis in India

https://doi.org/10.1054/tuld.1999.0204Get rights and content

Abstract

Setting: Mannose binding protein gene polymorphism in pulmonary tuberculosis in India.

Objective: To find out whether non-HLA genes such as mannose binding protein (MBP) genes are associated in the susceptibility to pulmonary tuberculosis.

Design: Genotyping of MBP 52, 54 and 57 wild and mutant alleles was carried out in HLA-DR typed pulmonary tuberculosis patients (n=202) and control subjects (n=109). Since HLA-DR2 is associated with pulmonary-TB, the interaction of MBP genes on -DR2 and non-DR2 genes on the susceptibility was also studied.

Results: A significantly increased genotype frequency of MBP functional mutant homozygotes (including 52, 54 and 57) was seen in pulmonary tuberculosis (PTB) patients (10.9%) than in control subjects (1.8%;P=0.008; odds ratio: 6.5). Analysis of interaction of MBP genes and HLA-DR2 on the susceptibility to PTB revealed that these genes are associated with PTB independent of each other.

Conclusion: The present study shows that functional mutants of MBP are associated with PTB. Apart from HLA-DR2 association, association of non-HLA genes in the susceptibility to PTB is evident. This suggests that multigenetic factors (candidate genes) may be involved in the susceptibility/resistance to PTB.

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