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Koichi Abe1, Daisuke Ogasawara, Wataru Yoshida

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Aptamers offer a novel alternative to antibodies for biosensing. A new system uses "capturable aptamers" that change structure to enable highly sensitive detection of target molecules, like thrombin.

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Area of Science:

  • Biochemistry
  • Molecular Biology
  • Biotechnology

Background:

  • Aptamers are nucleic acid molecules with high specificity for target binding.
  • Antibodies are widely used in biosensing but have limitations.
  • Aptamers offer potential advantages over antibodies in certain applications.

Purpose of the Study:

  • To develop a novel aptamer-based bound/free (B/F) separation system for enhanced biosensing.
  • To create a
  • capturable aptamer
  • that undergoes structural changes upon target binding.
  • To demonstrate the system's efficacy in detecting thrombin.

Main Methods:

  • Designed a
  • capturable aptamer
  • that exposes a single-stranded region upon target recognition.
  • Immobilized a complementary
  • capture DNA
  • on a support to bind the target-aptamer complex.
  • Utilized B/F separation to remove unbound aptamers and contaminants.
  • Constructed a thrombin-detection system using the developed aptamer-based method.

Main Results:

  • The B/F separation system effectively captured target-bound aptamers.
  • Unbound aptamers and contaminants were successfully removed.
  • Achieved highly sensitive detection levels comparable to sandwich immunoassays.
  • Demonstrated successful thrombin detection using the
  • capturable aptamer
  • system.

Conclusions:

  • The developed aptamer-based B/F separation system enables sensitive and specific molecular detection.
  • Capturable aptamers provide a robust platform for biosensing applications.
  • This technology holds significant potential for clinical diagnostics.