Single-molecule visualization of DNA G-quadruplex formation in live cells.
Single-molecule visualization of DNA G-quadruplex formation in live cells.
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DOI:
10.1038/s41557-020-0506-4
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发表时间:
2020-09
期刊:
影响因子:
21.8
通讯作者:
Balasubramanian S
中科院分区:
文献类型:
--
作者:
Di Antonio M;Ponjavic A;Radzevičius A;Ranasinghe RT;Catalano M;Zhang X;Shen J;Needham LM;Lee SF;Klenerman D;Balasubramanian S
Substantial evidence now exists to support that formation of DNA G-quadruplexes (G4s) can alter gene-expression. However, approaches that allow to probe G4s in living cells without perturbing their folding dynamics are required to understand their biological roles in greater detail. Herein, we report a G4-specific fluorescent probe (SiR-PyPDS) that enables single-molecule and real-time detection of individual G4 structures in living cells. Live-cell single-molecule fluorescence imaging of G4s was carried out under conditions that use low concentrations of SiR-PyPDS (20 nM) to provide informative measurements representative of the population of G4s in living cells, without globally perturbing G4 formation and dynamics. Single-molecule fluorescence imaging and time-dependent chemical trapping of unfolded G4s in living cells, revealed that G4s fluctuate between folded and unfolded states. We also demonstrated that G4-formation in live cells is cell-cycle dependent and disrupted by chemical inhibition of transcription and replication. Our observations provide robust evidence in support of dynamic G4-formation in living cells.
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通讯作者:
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影响因子:
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通讯作者:
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