Abstract
G-quadruplexes (GQ) and R-loops are non-canonical nucleic acid structures related to gene regulation and genome instability that can be formed during transcription; however, their formation mechanisms remain elusive. To address this question, we developed a single-molecule fluorescence technique to monitor the formation of G-quadruplex and R-loop structures during transcription. Using this technique, we found that R-loop formation precedes GQ formation and that there exists a positive feedback loop between G-quadruplex and R-loop formation.
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