Correlation Analysis of Staphylococcus aureus Drug Resistance and Virulence Factors with Blood Cell Counts and Coagulation Indexes.

Objective: The influence of different Staphylococcus aureus variants on blood cells and coagulation system was evaluated by investigating the carrying status of drug resistance genes and virulence genes of methicillin-resistantStaphylococcus aureus (MRSA) and methicillin-sensitiveStaphylococcus aureus (MSSA). Methods: A total of 105 blood culture-derivedStaphylococcus aureus strains were collected. The carrying status of drug resistance genes mecA and three virulence genes tst, pvl, and sasX was analyzed by polymerase chain reaction (PCR). The changes in routine blood routine counts and coagulation indexes of patients infected with different strains were analyzed. Results: The results showed that the positive rate of mecA was consistent with that of MRSA. Virulence genes tst and sasX were detected only in MRSA. Compared with MSSA, patients infected with MRSA or MSSA patients infected with virulence factor, leukocyte count and neutrophil count in peripheral blood were significantly increased, and the platelet count decreased to a higher degree. Part thromboplastin time increased, D-dimer increased, but fibrinogen content decreased more. The changes of erythrocyte and hemoglobin had no significant correlation with whether Staphylococcus aureus carried virulence genes. Conclusion: The detection rate of MRSA in patients with positive Staphylococcus aureus in blood culture had exceeded 20%. The detected MRSA bacteria carried three virulence genes, tst, pvl, and sasX, which were more likely than MSSA. MRSA, which carries two virulence genes, is more likely to cause clotting disorders.

Variants in the RARRES2 gene are associated with serum chemerin and increase the risk of diabetic kidney disease in type 2 diabetes.

Genetic susceptibility plays an important role in the pathogenesis of diabetic kidney disease (DKD). Recent studies have suggested that chemerin (encoded by the RARRES2 gene) is a risk factor for the development of DKD. We investigate the relationship between RARRES2 single nucleotide polymorphisms (SNPs) and DKD and their correlation with serum chemerin levels in Chinese individuals with type 2 diabetes (T2D). A total of 256 individuals with T2D were enrolled in this case-control study and classified into normo-, micro- and macroalbuminuria groups according to their urinary albumin/creatinine ratio (UACR). All exons of the RARRES2 gene were sequenced by polymerase chain reaction-direct sequencing, and 7 SNPs were genotyped. We found that the minor alleles of rs1047207, rs1047575 and rs1047586 were significantly associated with macroalbuminuria. Carriers of the minor allele of rs1047575 and rs1047586 also had higher urinary albumin (U-Alb) and UACR levels under both homo- and heterozygotic conditions than carriers of the major allele under the homozygotic condition. The minor alleles of rs1047207, rs1047575 and rs1047586 were significantly associated with increased serum chemerin levels under the homozygotic condition. These SNPs in the RARRES2 gene probably affect chemerin expression and likely confer susceptibility to albuminuria in individuals with T2D.