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- W4365139250 abstract "Abstract Background: The experimental evidence has demonstrated that active DNA demethylation process, which involves TET proteins, can affect DNA methylation pattern. TET dependent demethylation residues in DNA hypomethylation by oxidation 5-methylcytosine (5-mC) to 5-hydroxymethylcytosine (5-hmC) and its derivatives. TETs’ activity may be upregulated by ascorbate. Given that aberrant DNA methylation of crucial genes implicated in breast carcinogenesis may be involved in tumor progression, we wanted to determine whether breast cancer patients exert changes in active DNA demethylation process. Moreover, we tried to verify if the expression level of genes involved in active DNA demethylation and products of this process may serve as predictive markers of breast cancer. Methods: The study included blood samples from breast cancer patients (n=74) and healthy subjects (n=71). We applied qRT-PCR with Universal Probe Library probes for measurement of expression of genes involved in active demethylation process, and two dimensional ultra performance liquid chromatography with tandem mass spectrometry detection (2D-UPLC MS/MS) for 5–mC and its derivatives assessment. Ascorbate level was determined using UPLC-MS. Results: Breast cancer patients exhibited significantly higher TET3 expression level, lower 5-mC and 5-hmC DNA levels. TET3 expression was significantly increased in luminal B breast cancer patients with expression of hormone receptors. Moreover, ascorbate level in plasma of breast cancer patients was decreased with concomitant increase of sodium-dependent vitamin C transporters ( SLC23A1 and SLC23A2 ) mRNA expression level. Conclusions: Presented study indicate particular role of TET3 in DNA demethylation in breast carcinogenesis. Furthermore, correlation between SLC23A2 and 5-mC level, may provide new path for future breast cancer research." @default.
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- W4365139250 date "2023-04-12" @default.
- W4365139250 modified "2023-10-18" @default.
- W4365139250 title "Breast cancer epigenetics: comprehensive investigation of genes and chemical compounds involved in active DNA demethylation" @default.
- W4365139250 doi "https://doi.org/10.21203/rs.3.rs-2778971/v1" @default.
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