Pro-inflammatory and anti-inflammatory
cytokines have been shown to play an important role in
dengue disease pathogenesis. In the present study, to find out whether single nucleotide polymorphisms (SNPs) in the pro-inflammatory and anti-inflammatory
cytokine genes are associated with
dengue disease severity, SNPs in TNF, IFNG, IL1B,
IL8, IL0, IL17A and IL17F genes were investigated using polymerase chain reaction based methods in 132
dengue (DEN) cases [87
dengue fever (DF), 45
dengue hemorrhagic fever (DHF) cases] and 108 apparently healthy controls (HC) from Pune, Maharashtra, western India. Under recessive genetic model (C/C vs. T/T+T/C), the TNF rs1799964 C/C genotype was significantly associated with DEN [P=0.014, OR with 95% CI 3.07 (1.18-7.98)]. Frequency of T/C genotype of IL17F rs763780 was significantly lower in DEN group as compared to HC [P=0.033, OR with 95% CI 0.43 (0.19-0.95)]. Under overdominant genetic model (A/T vs. A/A+T/T),
IL8 rs4973 A/T genotype was negatively associated with DHF compared to HCs [p=0.029, OR with 95% CI 0.43 (0.20-0.93)]. Under overdominant genetic model, A/G genotype of
IL10 rs1800871 was significantly negatively associated with DHF compared to DF cases [p=0.014, OR with 95% CI 0.35 (0.15-0.84)]. Significantly higher frequency of the combined genotype
IL10 A/A-IFNG A/T and lower frequency of the combined genotypes
IL10 A/G-IL1B A/A,
IL10 A/G-
IL8 A/T and
IL10 A/G-IL17F T/T were observed in DHF cases compared to DF. The results suggest that heterozygous genotypes of
IL8 rs4973 and
IL10 rs1800871 are associated with reduced risk of DHF. Combinations of
IL10 rs1800871 and pro-inflammatory
cytokine genotypes influence the risk of DHF.