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Fluorescence Assays for the Study of Mycobacterium tuberculosis Interaction with the Immune Receptor SLAMF1

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Role played by human mannose-binding lectin polymorphisms in pulmonary tuberculosis.

Rosanna Capparelli¹, Marco Iannaccone, Daniela Palumbo

¹Faculty of Biotechnology, University of Naples Federico II, Naples, Italy.

The Journal of Infectious Diseases

|February 10, 2009

Summary

Mannose-binding lectin (MBL) gene variations influence tuberculosis risk. Specific MBL haplotypes offer protection, while others increase susceptibility in individuals exposed to tuberculosis.

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Area of Science:

Immunogenetics
Infectious Diseases
Molecular Biology

Background:

Mannose-binding lectin (MBL) is crucial for innate immunity, activating complement independently of antibodies.
MBL enhances phagocytosis and regulates inflammatory cytokine release from monocytes.

Purpose of the Study:

To investigate the association between MBL gene polymorphisms and susceptibility to pulmonary tuberculosis.
To determine if MBL gene variations impact host defense against tuberculosis.

Main Methods:

Genotyping of MBL gene promoter and exon 1 polymorphisms using polymerase chain reaction (PCR).
Analysis of 277 pulmonary tuberculosis patients and 288 household contacts.
Tuberculosis diagnosis confirmed by chest radiography, sputum smear, PCR, and bacteriological tests.

Main Results:

The HYA/HYA MBL haplotype pair demonstrated a significant protective effect against tuberculosis (OR, 0.09; P < 1 x 10^-6).
Conversely, the LYB/LYD MBL haplotype pair was strongly associated with susceptibility to tuberculosis (OR, 49; P < 1 x 10^-6).

Conclusions:

MBL gene polymorphisms play a significant role in determining host susceptibility or resistance to tuberculosis.
The specific MBL haplotype pair an individual possesses can either protect or predispose them to developing tuberculosis.