Spatiotemporal Molecular Readout

Molecular recorders write their record into DNA or RNA inside cells; the readout side asks how to recover that record with cellular identity and spatial position preserved. Spatial transcriptomics and in-situ sequencing methods — multiplexed fluorescence in-situ hybridisation, in-situ sequencing of amplified transcripts, and spatially-barcoded capture — read many molecular species at once at single-cell or subcellular resolution across an intact tissue section, rather than dissociating it into a pool.

Paired with a recorder, such a readout can in principle reconstruct not just which molecules a cell contained but which cells were active or connected and, from ordered edits, in what sequence — turning a brain into a densely sampled molecular record that a sequencer decodes. This is the enabling read technology for the molecular-recording programme; combining it with functional activity recording at scale is still nascent, and time resolution comes only from recorders explicitly designed to order their edits.