Genetic variation in PTX3 is associated with susceptibility to community-acquired pneumonia in adults: a retrospective case control study

Abstract

<jats:title>Abstract</jats:title> <jats:p><jats:bold>Background</jats:bold>Evidence indicates that single nucleoid polymorphisms (SNPs) of key molecules in innate immunity are related to clinical outcome of community-acquired pneumonia (CAP). Pentraxin 3 (PTX3) is a member of the acute-phase reactants superfamily and plays an important role against various diseases. The purpose of the current study was to assess the association between PTX 3 SNP and the risk of CAP.<jats:bold>Methods</jats:bold>This is a retrospective case-control study. Patients who were diagnosed with CAP between January 2018 to December 2019 in the Department of Pulmonary and Critical Care Medicine at Sun Yat-sen Memorial Hospital were included as CAP group. Then CAP cases were matched 1:1 by gender with non-infectious hospitalized patients during the same time. We detected the genotypes, allele frequencies and haplotype distributions of three SNPs within PTX3 gene (rs2305619, rs3816527, and rs1840680) by polymerase chain reaction sequencing in CAP group and control group, and compared their associations with the risk of CAP.<jats:bold>Results</jats:bold>Three SNPs in both groups were consist with Hardy-Weinberg equilibrium. A strong linkage disequilibrium was detected between any pair of rs2305619, rs3816527 and rs1840680 (|D’|≥0.85). There were no differences of rs2305619 and rs3816527 in genotypic distribution and haplotype frequency between CAP group and control group. However, we identified that SNP rs1840680 AA homozygote was associated with a lower risk of CAP in adults (OR, 0.32; 95% CI, 0.11-0.91; <jats:italic>p</jats:italic> = 0.03).<jats:bold>Conclusions</jats:bold>Our findings suggested that PTX3 single nucleoid polymorphism was associated with the risk of CAP in adults.</jats:p>