DNA nanostructure-encoded fluorescent barcodes

Identification and differentiation of various bioanalytes with high spatial and temporal resolution have spawned fluorescent barcode-based detection and imaging.DNA nanostructures with excellent structure programmability,addressability,and nearatomic structure accuracy have emerged as a versatile platform to develop fluorescent barcodes through finely controlled dye numbers,relative distances,and compositions.A variety of DNA fluorescent barcodes with distinguishable spectral colors,geometries and digitized fluorescence intensities have been constructed and favorably implemented in the field of bioimaging,multiplex bioassay,and information security.In this review,we first summarize the state of the art of self-assembled DNA nanostructures.Next,the utilization of DNA nanostructure to develop fluorescent barcodes and the photophysical properties of DNA-templated fluorophores are reviewed.Finally,the applications of DNA fluorescent barcodes for biosensing and imaging,and the challenges and outlook of DNA nanostructure-engineered fluorescent barcodes are discussed.