CRISPR Molecular Recorder

CRISPR molecular recorders write a durable record of cellular events into genomic DNA, to be read out later by sequencing. Rather than sensing voltage, they convert a biological signal — the activity of a promoter, a signalling pathway, or the passage of time — into edits at a designed locus: base editors or prime editors that accumulate signal-driven mutations, integrases that acquire ordered spacers, and enhancer-driven recorders that log transcriptional activity as sequence changes. The order and abundance of edits reconstruct what happened and, in the better systems, roughly when.

This lineage of tools has advanced quickly for recording gene-expression and lineage history in dividing cells, and provides the read/write substrate the molecular ticker tape wants. For neuroscience the appeal is a permanent, per-cell, sequencing-readable log; the reality is that fast, quantitative recording of electrical activity in non-dividing neurons in vivo is still largely proof-of-concept, and most demonstrations record slower signalling rather than spikes.