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The role of mannose-binding lectin in pneumococcal infection

M Isabel García-Laorden1, Felipe Rodríguez de Castro, Jordi Solé-Violán

  • 1Dept of Immunology, Hospital Universitario de Gran Canaria Dr Negrín, Las Palmas de Gran Canaria, Spain.

The European Respiratory Journal
|April 24, 2012
PubMed

Insights

Mannose-binding lectin (MBL) deficiency does not increase susceptibility to pneumococcal community-acquired pneumonia (P-CAP). However, the MBL-deficient O/O genotype is linked to a higher risk of invasive pneumococcal disease (IPD).

Area of Science:

  • Immunology
  • Genetics
  • Infectious Diseases

Background:

  • Mannose-binding lectin (MBL) deficiency's role in host defense is debated.
  • Collectins like surfactant proteins (SP)-A1, -A2, and -D are crucial for lung defense.
  • MBL2 gene variants (XA/O, O/O) cause MBL deficiency.

Purpose of the Study:

  • To investigate MBL deficiency's role in pneumococcal infection susceptibility.
  • To examine linkage disequilibrium (LD) between MBL2 and SP genes.
  • To clarify MBL's contribution to host defense against pneumococcal infections.

Main Methods:

  • Case-control study of 348 patients with pneumococcal community-acquired pneumonia (P-CAP) and 2,110 controls.
  • Meta-analysis of MBL2 genotypes in P-CAP and invasive pneumococcal disease (IPD) susceptibility.
  • Analysis of LD between MBL2, SFTPA1, SFTPA2, and SFTPD genes.

Main Results:

  • MBL2 genotypes showed no association with P-CAP or bacteraemic P-CAP in the case-control study.
  • A meta-analysis revealed the MBL-deficient O/O genotype associated with increased IPD risk.
  • The MBL-deficient XA/O genotype showed a trend towards protection against IPD.
  • Significant LD was found between MBL2 and SP genes.

Conclusions:

  • MBL deficiency is not a significant risk factor for P-CAP or IPD.
  • LD between MBL2 and SP genes should be considered in future research.
  • The role of MBL in infectious disease susceptibility requires further investigation, considering genetic interactions.

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