Development of fluorescent probes specific for parallel-stranded G-quadruplexes by a library approach

A 241-membered cyanine-based library was constructed by the combinatorial chemistry strategy. Combined with high-throughput screening, we successfully discovered a novel fluorescent probe (CyC-M716) capable of identifying a subset of parallel G-quadruplexes with propeller loops stretching across three tetrad layers with high sensitivity and selectivity.