Spatial Proofreading Amplification of in situ Transcript and Protein Signals
Tischbirek, C. H.; Colon, K. L.; Lobbia, S.; Cronin, C. J.; Cai, L.
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Spatial transcriptomics experiments greatly benefit from brighter signals that improve detection efficiency and shorten imaging times. Here, we introduce a new enzyme-free signal amplification method inspired by the kinetic proofreading principle, in which short oligonucleotide probes are iteratively deposited at their target site and covalently photo-crosslinked to the cell, forming highly stable DNA assemblies. The method results in more than 500-fold signal amplification and supports multiplex readout capabilities.
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