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Background:  Vitamin D deficiency has been associated with increased sepsis incidence and mortality in various populations. Vitamin D exerts its effect through vitamin receptor (VDR), and various single nucleotide polymorphisms have been reported to affects the expression and structure of the VDR. In the present study, we investigated the possible role of vitamin D deficiency and VDR polymorphisms in susceptibility to sepsis. Methods:  576 sepsis patients and 421 healthy controls were enrolled in the present study. Plasma vitamin D levels in patients and healthy controls were quantified by ELISA. Genetic variants in the VDR (FokI, TaqI, BsmI, and ApaI) were genotyped by TaqMan assay. Results:  Reduced serum Vitamin D level was observed in subjects with sepsis compared to healthy controls ( p  ≤ 0.0001). Further, subjects with septic shock had diminished 25(OH) vitamin D compared to severe sepsis cases ( p  ≤ 0.0001). FokI variants and minor alleles were more prevalent in sepsis patients compared to healthy controls (Ff:  p  ≤ 0.0001, χ 2  =17.39; ff:  p =0.001, χ 2  =10.79; f:  p  ≤ 0.0001, χ 2  =23.51). Furthermore, combined plasma levels of 25(OH) vitamin D and FokI polymorphism revealed a significant role in a predisposition to sepsis and septic shock. However, the prevalence of other VDR polymorphisms (TaqI, BsmI and ApaI) were comparable among different clinical categories. Conclusions:  Low 25(OH) vitamin D levels and FokI mutants are associated with an increased risk of sepsis and septic shock in a Chinese cohort.Clinical significanceLower levels of 25-OH vitamin D are highly prevalent in Sepsis patients.Subjects harbouring VDR FokI variants are predisposed to susceptibility to sepsis in the studied cohort. Lower levels of 25-OH vitamin D are highly prevalent in Sepsis patients. Subjects harbouring VDR FokI variants are predisposed to susceptibility to sepsis in the studied cohort.

Lower vitamin D levels and VDR FokI variants are associated with susceptibility to sepsis: a hospital-based case-control study