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Evolution of functional six-nucleotide DNA.

Liqin Zhang1, Zunyi Yang2, Kwame Sefah1

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This summary is machine-generated.

Synthetic biologists expanded DNA

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Area of Science:

  • Synthetic biology
  • Molecular biology
  • Biochemistry

Background:

  • Standard DNA uses four nucleotides (GACT), limiting information density and functional capabilities.
  • Synthetic biology aims to expand the genetic alphabet for enhanced molecular performance.
  • The Watson-Crick pairing geometry is a fundamental principle in DNA structure and replication.

Purpose of the Study:

  • To investigate the utility of incorporating two novel nucleotides, Z and P, into DNA.
  • To assess the ability of a GACTZP library to evolve molecules with selective binding to cancer cells.
  • To explore the sequence space and functional potential of expanded genetic systems.

Main Methods:

  • Inclusion of synthetic nucleotides Z and P into a DNA library for laboratory in vitro evolution (LIVE).
  • Selection pressure applied to evolve oligonucleotides that bind selectively to liver cancer cells.
  • Analysis of recovered binding species to identify sequences containing Z and P nucleotides.

Main Results:

  • Over a dozen DNA species with selective binding capabilities were recovered from the GACTZP library.
  • The most effective binders contained Z and/or P nucleotides, often in multiple, adjacent positions.
  • Weaker binders lacked Z and P, suggesting these novel nucleotides enhance binding functionality.

Conclusions:

  • The GACTZP library significantly expands the accessible sequence space and functional repertoire of DNA.
  • Synthetic nucleotides Z and P enhance the ability of oligonucleotides to evolve specific molecular functions.
  • Expanded genetic systems offer richer reservoirs of functionality compared to standard DNA libraries.