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Updated: Aug 6, 2026
09:26
DNA-Tethered RNA Polymerase for Programmable In vitro Transcription and Molecular Computation
Published on: December 29, 2021
Programmable DNA-Based Dimerization Networks for Dynamic and Competitive Control of Transcription
Miriam Quattrociocchi1, Simone Brannetti1, Erica Del Grosso1
1Department of Chemical Sciences and Technologies, University of Rome, Tor Vergata, Via della Ricerca Scientifica, Rome 00133, Italy.
Journal of the American Chemical Society
|July 20, 2026
Summary
We developed a DNA system for programmable cell-free transcription control. This DNA dimerization network enables tunable RNA production and logic-based enzymatic reactions.
Area of Science:
- Synthetic Biology
- Molecular Biology
- Biochemistry
Background:
- Protein dimerization networks are crucial in biological signaling.
- Controlling cell-free transcription requires precise molecular programming.
- DNA nanotechnology offers a platform for creating synthetic biological systems.
Purpose of the Study:
- To introduce a DNA-encoded system for programmable control of cell-free transcription.
- To create a tunable many-to-many dimerization network using DNA monomers.
- To interface DNA dimerization logic with downstream enzymatic outputs.
Main Methods:
- Designed DNA monomers with orthogonal azide or DBCO handles for covalent assembly via SPAAC chemistry.
- Constructed combinatorial DNA dimer libraries to activate transcription.
- Expanded network size (2 to 22 monomers) to tune RNA yield.
- Developed sequence-defined inputs for monomer sequestration and multiplexed activation.
- Integrated DNA dimerization with CRISPR-Cas12a for amplified cleavage activity.
Main Results:
- Achieved programmable control of cell-free transcription using DNA dimerization.
- Demonstrated tunable RNA yield over an order of magnitude by varying network size.
- Showcased multiplexed and orthogonal activation of different DNA templates.
- Successfully interfaced DNA dimerization logic with CRISPR-Cas12a for amplified enzymatic output.
Conclusions:
- Competitive covalent DNA dimerization networks provide a modular and predictable platform.
- This system enables precise control over cell-free transcription and downstream enzymatic reactions.
- The developed platform has potential applications in synthetic biology and biosensing.
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