Artificially expanded genetic information system: a new base pair with an alternative hydrogen bonding pattern

Area of Science:

• Synthetic biology
• Nucleic acid chemistry
• Biotechnology

Background:

• Advancing synthetic biology requires expanding the natural genetic information system.
• Artificial genetic systems offer new possibilities for DNA-based technologies.

Purpose of the Study:

• To synthesize novel nucleobase analogs for an artificially expanded genetic information system (AEGIS).
• To develop methods for incorporating these analogs into DNA oligonucleotides.
• To characterize the properties of the new AEGIS components and their base pairing.

Main Methods:

• Chemical synthesis of pyrimidine analog (dZ) and purine analog (dP) nucleosides.
• Preparation of triphosphate and phosphoramidite derivatives.
• Oligonucleotide synthesis using phosphoramidites.
• Hybridization studies to assess base-pairing strength and specificity.

Main Results:

• Successful synthesis of dZ and dP nucleosides, their triphosphates, and phosphoramidites.
• Demonstrated incorporation of dZ and dP into DNA oligonucleotides without epimerization.
• The dZ:dP base pair exhibits strong hybridization and effective discrimination against mismatches.

Conclusions:

• The developed AEGIS components (dZ:dP) are suitable for creating novel DNA structures.
• This work lays the foundation for engineered genetic systems with expanded capabilities.
• The strong and specific binding of dZ:dP enhances the potential of synthetic DNA technologies.