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DNA-Tethered RNA Polymerase for Programmable In vitro Transcription and Molecular Computation
Published on: December 29, 2021
Harnessing Synergistic Enthalpy-Entropy Regulation: An I-Motif-Based Modulating Design for Programming
Angewandte Chemie (International Ed. in English)
|August 11, 2026
Summary
This study introduces a novel DNA switch design using i-motif structures for programmable and tunable pH-responsive biosensing. The innovative approach enhances accuracy and adaptability for diverse biomedical applications.
Area of Science:
- Molecular Biology
- Biochemistry
- Biotechnology
Background:
- DNA switches offer potential in biomedicine but suffer from limited programmability, accuracy, and sensitivity.
- Existing designs lack adaptability and tunable response windows for diverse applications.
Purpose of the Study:
- To engineer programmable and tunable pH-responsive DNA switches using an i-motif-based modulating design.
- To leverage enthalpy-entropy synergy for enhanced DNA switch performance.
- To demonstrate the adaptability of the design across various aptamers and analytes.
Main Methods:
- Developed an i-motif-based DNA switch design coupling aptamers with split i-motif structures via variable-length linkers.
- Utilized linker-length modulation as dual thermodynamic regulators to control switch parameters.
- Incorporated an auxiliary sequestration mechanism for independent fine-tuning of parameters.
- Tested the design with aptamers targeting ATP, cortisol, Zn2+, and PTK7.
Main Results:
- Achieved programmable and tunable pH-responsive DNA switches with enhanced accuracy and sensitivity.
- Demonstrated successful conversion of diverse aptamers into functional switches.
- Validated the design for multi-analyte detection in tumor microenvironment profiling.
- Showcased cross-platform adaptability and independent parameter fine-tuning.
Conclusions:
- The i-motif-based modulating design represents a paradigm shift in rational molecular switch engineering.
- This strategy enables precise control over DNA switch characteristics, moving beyond trial-and-error methods.
- Opens new avenues for advanced responsive biosensing and diagnostic applications.
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