Programmable promoter editing for precise control of transgene expression.

DIAL enables precise, heritable tuning of transgene expression through programmable promoter editing, achieving stable, heritable setpoints in primary and stem cells.

• Why it matters: Controlling gene expression levels is crucial for directing cell states and functions, but existing tools lack fine-scale, heritable, and adjustable control over transgene dosage, limiting applications in cell engineering and gene therapy.
• What they did: The authors developed DIAL, a modular framework that uses recombinase-mediated spacer excision within synthetic zinc finger transcription factor binding sites, creating a tunable range of promoter setpoints, with control via small molecules.
• The result: DIAL produces stable, heritable transgene expression levels in various cell types, enabling precise mapping of gene dosage to cell fate and enhancing the predictability of gene circuit performance for diverse biomedical applications.