1. G-quadruplex structures in FGFR3 promoter negatively regulate its gene expression and DNA replication.
- Author
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Shi, Ke, Chen, Kuida, Lu, Shipeng, Luo, Qiong, and Xu, Qiang
- Subjects
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GENETIC regulation , *GENE expression , *MOLECULAR biology , *CYTOLOGY , *DNA replication - Abstract
FGFR3 activating mutations and abnormal expression are linked to tumor development. However, the current state of research on FGFR3 gene expression regulation is relatively insufficient. In this study, we have reported that the FGFR3 promoter's positive strand contains several G-tracts and most likely forms a G-quadruplex (G4) structure. Circular dichroism investigations revealed that oligonucleotides from this region exhibit G-quadruplex-like molar ellipticity. We further validated the G4 structure of the FGFR3 promoter using biochemical and cellular molecular biology techniques. The G-quadruplex mutation enhanced the transcriptional activity of the FGFR3 promoter and DNA replication, suggesting that the G4 structure inhibits its expression. Furthermore, we conducted a preliminary screen for helicases associated with FGFR3 expression and explored their regulatory effects on FGFR3 gene transcription. Subsequently, we investigated the effect of curcumin on the stability of the G4 structure of the FGFR3 promoter and its regulatory effect on FGFR3 expression. • 1.The positive strand of the FGFR3 promoter contains several G-tracts with the capacity to form G-quadruplex structures. • The G-quadruplex negatively regulates FGFR3 promoter-mediated transcription and its DNA replication. • Helicases DDX42 and RTEL1 potentially unwind the G4 structures in the FGFR3 promoter. • Curcumin binds to and stabilizes the FGFR3 promoter G-quadruplexes and inhibits its transcriptional activity. [ABSTRACT FROM AUTHOR]
- Published
- 2024
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