Modulating cell-free transcription electrolytically with switchable DNA triplexes

EDGE modulates cell-free transcription using switchable DNA triplexes, where electrolytic water decomposition opens or closes the triplex to inhibit gene expression in controllable cases.

• Why it matters: Electrogenetic control of transcription has typically needed redox mediators and complex regulatory proteins, limiting simpler on-demand electrical regulation in engineered systems.
• What they did: The authors built DNA triplex constructs (48 triplex-forming designs plus matched controls) and tested them in a cell-free transcription setup, using electrolytic decomposition of water to switch triplex states.
• The result: In numerous cases, the triplex inhibited gene expression in a controllable manner, enabling electrical control of in vitro RNA synthesis and suggesting future electrical control of protein expression.

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