TDG (Thymine DNA Glycosylase)

Pharmacological inhibition of EZH2 with EPZ6438 reactivated TDG expression in RAS and BRAF-mutated ATC cell lines and partially restored iodide uptake...Impact statement This study reveals how EZH2-driven epigenetic remodeling controls thyroid cell dedifferentiation and loss of iodide uptake in anaplastic thyroid cancer. Our findings provide new mechanistic insights and highlight an FDA-approved drug with repurposing potential, advancing both anaplastic thyroid cancer biology research and therapeutic perspectives.

We hypothesized that thymine DNA glycosylases (TDGs) may be involved in anticancer drug resistance given their dual function of DNA repair and demethylation as well as investigated their possible involvement in the induction of β-catenin in SNUC5 cells resistant to 5-fluorouracil (SNUC5/5-FUR) and oxaliplatin (SNUC5/OXTR). Additionally, TDG significantly interacted more with TET1 in both resistant cell types than in SNUC5 cells, enhancing binding to the same locus in the β-catenin promoter. These findings suggest that TDG may be a promising target molecule for overcoming drug resistance in colorectal cancer.

Based on these datasets, we provide a multi-dimensional analysis of TDG gene sets in specific cancer types, providing insights into their driving effects. Collectively, CTDdgv has significant potential to serve as a valuable resource for molecular diagnostics and therapeutic decision-making in cancer via liquid biopsy.

Characteristic DNA methylation/hydroxymethylation and iVC profiles have been observed in both PC and BPH, suggesting potential shared molecular pathways between the two conditions. As a fraction of leukocytes may be recruited to the pathological tissues and can migrate back into the circulation/blood, the observed alterations in leukocytes may reflect dynamic changes associated with the PC development, suggesting their potential utility as early markers of prostate cancer development.

Using a unique dataset that spans the pre- and post-TMZ eras, we demonstrate that germline variation in DDR-related genes may have significant impact on overall survival for patients treated with TMZ, with no effects observed in the pre-TMZ era. This suggests that germline variants in these DDR genes could be used to personalize TMZ therapy to improve patient survival.

The DNA demethylation process leads to alternations in TNC methylation levels and promotes its expression, thereby contributing to the development of gliomas. These results suggest a novel epigenetic therapeutic strategy targeting active DNA demethylation in gliomas.

Nucleoplasmic separation assay, fluorescence in situ hybridization, RNA pulldown, RNA immunoprecipitation, the HDOCK Server, the NucleicNet Webserver, crosslinking-immunoprecipitation, MG132 treatment, and chromatin immunoprecipitation were utilized to explore the potential molecular mechanism of circSLC39A5 in HCC...Overexpression of circSLC39A5 elevates TDG expression and reverses the increase of proliferating cell nuclear antigen (PCNA) expression and the overactive cell proliferation caused by TDG silencing. Our findings uncovered a novel plasma circRNA, circSLC39A5, which may be a potential circulating diagnostic marker for HCC, and the mechanism by which nucleus-localized circSLC39A5 exerts a transcriptional regulatory role in HCC by affecting STAT1/TDG/PCNA provides new insights into the mechanism of circRNAs.

In addition, TDG can affect the Hippo signaling pathway through ABL1 to regulate HCC cell proliferation, apoptosis, invasion and migration. Overall, our study demonstrated that TDG reduces DNA methylation of ABL1, increases ABL1 protein expression, and affects the Hippo signaling pathway to regulate the malignant progression of HCC.

Our results suggest that the accumulation of 5-hydroxymethyluracil in DNA of CLL cells is not caused by defective DNA repair or aberrant deamination. The main contributor may be an aberrant expression of TET2, additionally stimulated by an exceptionally high concentration of intracellular vitamin C. DNA methylation, Hydroxymethylation, Demethylation, Chronic lymphocytic leukemia

Our findings reveal a novel epigenetic regulation, linked to the type of genomic instability, by which TET1/TDG-mediated DNA demethylation decreases methylation levels and inflammatory/interferon/immune responses. CIMP in CRC is triggered by an imbalance of methylating activities over demethylating activities. These mice represent a model of CIMP CRC.