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- W4310348013 abstract "Purpose: Deregulation of <i>SNCA</i> encoding α-synuclein (α-SYN) has been associated with both the familial and sporadic forms of Parkinson disease (PD). Epigenetic regulation plays a crucial role in PD. The intron1 of <i>SNCA</i> harbors a large unmethylated CpG island. Ten-eleven translocation methylcytosine dioxygenase 1 (TET1), a CpG island binding protein, can repress gene expression by occupying hypomethylated CpG-rich promoters, and therefore <i>SNCA</i> could be a target for TET1. We investigated whether TET1 binds to <i>SNCA</i>-intron1 and regulates gene expression.Methods: The dopaminergic neuronal cell line, ReNcell VM, was used. Reverse transcription-polymerase chain reaction (RT-PCR), real time-quantitative PCR, Western blot, dot-blot, and Chromatin immunoprecipitation were conducted. The substantia nigra tissues of postmortem PD samples were used to confirm the level of TET1 expression.Results: In the human dopaminergic cell line, ReNcell VM, overexpression of the DNA-binding domain of TET1 (TET1-CXXC) led to significant repression of α-SYN. On the contrary, knocking down of TET1 led to significantly higher expression of α-SYN. However, overexpression of the DNA-hydroxymethylating catalytic domain of TET1 failed to change the expression of α-SYN. Altogether, we showed that TET1 is a repressor for <i>SNCA</i>, and a CXXC domain of TET1 is the primary mediator for this repressive action independent of its hydroxymethylation activity. TET1 levels in PD patients are significantly lower than that in the controls.Conclusions: We identified that TET1 acts as a repressor for <i>SNCA</i> by binding the intron1 regions of the gene. As a high level of α-SYN is strongly implicated in the pathogenesis of PD, discovering a repressor for the gene encoding α-SYN is highly important for developing novel therapeutic strategies for the disease." @default.
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- W4310348013 date "2022-11-30" @default.
- W4310348013 modified "2023-10-14" @default.
- W4310348013 title "Regulation of Αlpha-Synuclein Gene (SNCA) by Epigenetic Modifier TET1 in Parkinson Disease" @default.
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- W4310348013 doi "https://doi.org/10.5213/inj.2222206.103" @default.
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