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- W2397816210 abstract "Regulatory T cells (Tregs) which may indicate operational tolerance provide a promising biomarker for individualization of immunosuppression. Naturally thymus-derived Tregs (nTregs) represent the major suppressive phenotype and can be identified by their demethylation status in the Tregs Specific Demethylated Region (TSDR) of the Forkhead-Box-P3 (FOXP3) gene using quantitative PCR (qPCR). The analytical performance of a TSDR demethylation qPCR assay was assessed in whole blood of healthy individuals (HI) and kidney transplant recipients (KTR). The assay was compared to conventional flow cytometry and the agreement of results between two laboratories using a comparable qPCR protocol was assessed. In addition, the effect of gender, age, and medications was investigated. Within and between series imprecision was < 20% (n = 6). Whole blood samples are suitable for analysis within 3 days when stored at room temperature; both whole blood and DNA samples - within 12 months when frozen at − 80 °C. A significant correlation between the qPCR results and flow cytometry was lacking both with samples from HI and KTR. qPCR results between laboratories showed a bias of 76% but correlated well (r = 0.645; p = 0.0002, n = 29). nTregs determined by qPCR were significantly (p < 0.05) higher in HI (0.73% ± 0.23%, n = 60) than in KTR (0.45% ± 0.21%, n = 60) and in female HI (1.0% ± 0.27%, n = 30) than in male HI (0.45% ± 0.23%, n = 27). No effect of drugs or age was observed. The qPCR assay for nTregs provides reproducible results and is of sufficient quality for working with patient samples although inter-laboratory differences can be encountered due to a lack of method standardization. It was confirmed that gender-specific reference ranges are required." @default.
- W2397816210 created "2016-06-24" @default.
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- W2397816210 date "2016-10-01" @default.
- W2397816210 modified "2023-10-14" @default.
- W2397816210 title "Analytical evaluation of a real-time PCR-based DNA demethylation assay to assess the frequency of naturally occurring regulatory T cells in peripheral blood" @default.
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- W2397816210 doi "https://doi.org/10.1016/j.clinbiochem.2016.05.019" @default.
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