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Primer-Free Aptamer Selection Using A Random DNA Library
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Array-based discovery of aptamer pairs.

Minseon Cho1, Seung Soo Oh, Jeff Nie

  • 1Department of Mechanical Engineering, University of California-Santa Barbara , Santa Barbara, California 93106, United States.

Analytical Chemistry
|December 16, 2014
PubMed
Summary
This summary is machine-generated.

Researchers developed a new platform, AD-MAP, to efficiently discover DNA aptamer pairs for improved molecular detection. This method creates ultra-high-affinity bidentate reagents with significant potential for research and clinical applications.

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Area of Science:

  • Biotechnology
  • Molecular Biology
  • Biochemistry

Background:

  • Affinity reagent pairs enhance molecular detection sensitivity and specificity.
  • Bidentate reagents with two-site target recognition show significantly higher affinities than monovalent components.
  • DNA aptamers are suitable for linked constructs but difficult to select in pairs due to dominant epitope selection.

Purpose of the Study:

  • To develop an efficient method for discovering DNA aptamer pairs.
  • To create novel bidentate aptamer reagents with ultra-high affinity.
  • To overcome limitations of conventional aptamer selection methods.

Main Methods:

  • Utilized an array-based discovery platform for multivalent aptamers (AD-MAP).
  • Employed microfluidic selection and high-throughput sequencing for aptamer pool enrichment.
  • Synthesized custom arrays for parallel affinity measurements and secondary epitope screening.

Main Results:

  • Successfully discovered DNA aptamer pairs binding distinct sites on human angiopoietin-2 with high affinity, even in serum.
  • Constructed ultra-high-affinity bidentate reagents with equilibrium dissociation constants as low as 97 pM.
  • Demonstrated >200-fold affinity improvement compared to individual aptamer components.

Conclusions:

  • AD-MAP platform enables efficient discovery of novel aptamer pairs using arrays.
  • The developed bidentate aptamer reagents exhibit ultra-high affinity and promise for research and clinical use.
  • Functional studies confirm critical contributions of both aptamers to the enhanced affinity.