Correlation between single nucleotide polymorphism of TET2 gene and susceptibility and prognosis of sepsis

Objective To investigate the association of SNPs in TET2 gene with the susceptibility and prognosis of sepsis. Methods Ninety-nine patients diagnosed with sepsis and 107 controls were enrolled in the study. The septic patients were further divided into survivors (56 cases) and non-survivors (43 cases) according to the outcome of 28-day hospitalization. Patients without sepsis after major surgery were enrolled as the controls. The genotypes of the five loci (rs6839705, rs7670522, rs7679673, rs7698522 and rs10010325) with high minor allele frequency in the TET2 were screened according to the existing research reports and the SNP database of the NCBI website. The five loci were detected by TaqMan probe based allelic discrimination assays using real-time polymerase chain reaction (PCR). The data were calculated for genetic association study through χ2 test and Fisher’s exact probability method. Results There was no significant difference in genotype frequencies of the five tested SNPs in TET2 gene between septic patients and controls or between survivors and non-survivors in septic patients (P > 0.05). Furthermore, the allelic frequencies of the five SNPs between septic patients and controls or between survivors and non-survivors in septic patients also had no significant difference (P > 0.05). Conclusions This study showed that the five SNPs in TET2 gene (rs6839705, rs7670522, rs7679673, rs7698522, and rs10010325) were not associated with the susceptibility and prognosis of sepsis, which needs to be further confirmed by large-sample studies. Key words: Sepsis; DNA hydroxymethylase TET2; Single nucleotide polymorphism (SNP); Genotype; Allele; Case-control study