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The flow of genetic information in cells from DNA to mRNA to protein is described by the central dogma, which states that genes specify the sequence of mRNAs, which in turn specify the sequence of amino acids making up all proteins. The decoding of one molecule to another is performed by specific proteins and RNAs. Because the information stored in DNA is so central to cellular function, it makes intuitive sense that the cell would make mRNA copies of this information for protein synthesis...
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Updated: Jan 23, 2026

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Construction of complex and diverse DNA sequences using DNA three-way junctions.

Noah Evan Robinson1, Weilin Zhang1, Rajesh Ghosh2,3

  • 1Division of Biology and Biological Engineering, California Institute of Technology, Pasadena, CA, USA.

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A new DNA assembly method, Sidewinder, overcomes limitations in synthetic DNA construction. It enables robust and accurate assembly of complex DNA sequences and large libraries, advancing synthetic biology.

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Area of Science:

  • Synthetic Biology
  • Molecular Biology
  • Biotechnology

Background:

  • De novo synthetic DNA construction is crucial for biological engineering and research.
  • Current DNA assembly technologies struggle with producing long, complex synthetic DNA sequences and libraries.
  • Existing methods rely on the final DNA sequence for assembly, limiting optimization.

Purpose of the Study:

  • To develop a novel DNA assembly technique that decouples assembly information from the final sequence.
  • To address the limitations of current DNA assembly methods for complex synthetic constructs.
  • To enable high-fidelity construction of long synthetic DNA sequences and diverse libraries.

Main Methods:

  • Development of the Sidewinder DNA assembly technique utilizing DNA three-way junctions.
  • Separation of assembly-guiding information from the final assembled DNA sequence.
  • Demonstration of the technique's robustness and accuracy in various assembly scenarios.

Main Results:

  • Successful construction of a 40-piece multifragment DNA assembly.
  • Robust assembly of complex DNA sequences with high GC content and repeats.
  • Parallel assembly of multiple distinct genes and a combinatorial library of 442,368 variants.
  • Achieved a misconnection rate of approximately 1 in 1,000,000 at the three-way junction.

Conclusions:

  • The Sidewinder technique offers a transformative approach to DNA assembly.
  • Enables high-fidelity and extensive optimization of synthetic DNA constructs.
  • Significantly advances the capabilities for engineering and studying biological systems through synthetic DNA.