MASP2 haplotypes are associated with high risk of cardiomyopathy in chronic Chagas disease

Clin Immunol. 2011 Jul;140(1):63-70. doi: 10.1016/j.clim.2011.03.008. Epub 2011 Mar 23.

Abstract

Mannose-binding lectin (MBL) initiates complement on Trypanosoma cruzi through the MBL-associated serine protease 2 (MASP2). We haplotyped six MASP2 polymorphisms in 208 chronic chagasic patients, being 81 indeterminate and 123 symptomatic (76 with cardiac, 19 with digestive and 28 with cardiodigestive forms) and 300 healthy individuals from Southern Brazil, using PCR with sequence-specific primers. The g.1961795C, p.371D diplotype (short CD) occurred at a higher frequency among symptomatic patients, compared with the indeterminate group (P(Bf)=0.012, OR=3.11), as well as genotypes with CD, but not with the g.1945560A in the promoter in cardiac patients (P(Bf)=0.012, OR=13.54). CD haplotypes linked to the p.P126L and p.V377A variants were associated with reduced MASP-2 levels (P<0.0001) but not reduced MBL/MASP-2/C4 complexes. MASP2*CD genotypes, most of them generating low MASP-2 levels, are associated with high risk of chagasic cardiomyopathy. Rapid MASP2 genotyping might be used to predict the risk of symptomatic disease.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Adult
  • Aged
  • Chagas Cardiomyopathy / genetics*
  • Chronic Disease
  • Female
  • Genetic Predisposition to Disease / genetics*
  • Genotype
  • Haplotypes
  • Humans
  • Male
  • Mannose-Binding Protein-Associated Serine Proteases / genetics*
  • Middle Aged
  • Polymerase Chain Reaction
  • Polymorphism, Genetic
  • Risk Factors

Substances

  • MASP2 protein, human
  • Mannose-Binding Protein-Associated Serine Proteases