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A DNA nanomachine that maps spatial and temporal pH changes inside living cells
Souvik Modi1, Swetha M G, Debanjan Goswami
1National Centre for Biological Sciences, Tata Institute of Fundamental Research, GKVK, Bellary Road, Bangalore, 560065, India.
Nature Nanotechnology
|May 8, 2009
Summary
Researchers developed a novel DNA nanomachine, the I-switch, that functions as a pH sensor within living cells. This advancement enables real-time monitoring of intracellular pH changes, opening doors for new diagnostics and therapies.
Area of Science:
- Biotechnology
- Molecular Engineering
- Cellular Biology
Background:
- DNA nanomachines are synthetic molecular devices.
- Previous DNA nanomachines were limited to in vitro applications.
- Intracellular pH monitoring is crucial for understanding cellular processes.
Purpose of the Study:
- To construct a DNA nanomachine for intracellular pH sensing.
- To demonstrate the function of the I-switch within living cells.
- To explore the potential of DNA nanodevices for in vivo applications.
Main Methods:
- Construction of the I-switch DNA nanomachine.
- Utilizing fluorescence resonance energy transfer (FRET) for pH detection.
- Application of the I-switch to map pH changes during endosome maturation in living cells.
Main Results:
- The I-switch functions as an efficient pH sensor in the range of pH 5.5 to 6.8.
- A high dynamic range was observed between pH 5.8 and 7.
- The I-switch successfully mapped spatial and temporal pH changes in living cells during endosome maturation.
Conclusions:
- The I-switch demonstrates successful in vivo application of DNA nanomachines.
- DNA nanodevices can be engineered to respond to biological triggers like pH.
- This technology holds promise for sensing, diagnostics, and targeted therapies in living systems.
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