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Related Experiment Video

Updated: Oct 1, 2025

Design and Synthesis of a Reconfigurable DNA Accordion Rack
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Single 3'-exonuclease-based multifragment DNA assembly method (SENAX).

Viet Linh Dao1,2, Sheena Chan1,2, Jingyun Zhang1,2

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Summary

We developed SENAX, a novel DNA assembly method using Stellar ExoNuclease Assembly miX. This efficient technique simplifies constructing DNA plasmids with short fragments, reducing costs in biotechnology and synthetic biology.

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Area of Science:

  • Biotechnology
  • Synthetic Biology
  • Molecular Biology

Background:

  • DNA assembly is crucial for engineering microorganisms in biotechnology and synthetic biology.
  • Existing homology-based methods have limitations in assembling short DNA fragments.

Purpose of the Study:

  • To introduce SENAX (Stellar ExoNuclease Assembly miX), a novel enzymatic homology-based DNA assembly method.
  • To demonstrate SENAX's efficiency in assembling multiple DNA fragments, including short ones.

Main Methods:

  • Utilizes a 3'-5' exonuclease (XthA/ExoIII) for DNA assembly at ambient temperatures (30-37°C).
  • Requires short homology overlaps (12-18 base pairs).
  • Incorporates Escherichia coli transformation for scalability and optimization.

Main Results:

  • SENAX efficiently assembles multiple DNA fragments with minimal homology overlap.
  • Successfully assembles DNA fragments as short as 70 bp into a vector, a significant improvement over existing methods.
  • Enables modular DNA assembly using reusable bioparts (promoter-RBS), simplifying construction and reducing synthesis costs.

Conclusions:

  • SENAX is an accurate, highly efficient, and automation-friendly DNA assembly method.
  • The modular approach using SENAX streamlines synthetic biology workflows.
  • SENAX overcomes limitations of current technologies for assembling short DNA fragments.