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Researchers developed controllable DNA biosensors that can sense targets and respond to external stimuli. This engineering strategy enables programmable biosensing for applications in environmental monitoring and medical diagnostics.

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Area of Science:

  • Biotechnology
  • Nanotechnology
  • Molecular Engineering

Background:

  • DNA biosensors offer significant potential in environmental and medical fields.
  • Current limitations include single functionality and lack of controllability, hindering broader applications.
  • Controllable nanodevices with sensing and stimulus-response capabilities are needed.

Purpose of the Study:

  • To engineer structure-switching biosensors with both sensing and external stimulus-response capabilities.
  • To develop a modular strategy for creating controllable nanodevices.
  • To demonstrate the generalizability of the strategy for programmable biosensing.

Main Methods:

  • Designed a nanodevice with an actuation module and a sensing module.
  • Utilized a blocker strand as an allosteric switch to initially disable the sensing module.
  • Engineered stimuli-responsive actuation modules to displace the blocker DNA and activate the sensing module.
  • Demonstrated with a controllable mercury ion (Hg2+) sensor using logic gates and an adenosine triphosphate (ATP) sensor.

Main Results:

  • Successfully engineered structure-switching biosensors that respond to external stimuli while maintaining sensing ability.
  • Developed a controllable Hg2+ sensor incorporating 'YES', 'AND', and 'OR' logic gates for oligonucleotide input recognition.
  • Validated the modular strategy's generalizability by applying it to an ATP sensor.

Conclusions:

  • The proposed strategy enables the creation of controllable nanodevices with dual sensing and responding functions.
  • This modular approach is highly generalizable to various structure-switching biosensors.
  • The technology holds promise for programmable biosensing, disease diagnosis, DNA computing, and intelligent nanodevices.