Identifying and Differentiating Topological G-Quadruplex Structures with DNA-Encoded Plasmonic Gold Nanoparticles

Area of Science:

• Biochemistry
• Nanotechnology
• Genomics

Background:

• DNA G-quadruplexes (G4s) are crucial in regulating genomic functions and biological processes.
• G4 structure and nucleotide composition dictate their biological roles.
• Accurate and rapid methods for G4 structure identification are currently limited.

Purpose of the Study:

• To develop a synthetic G4 DNA-encoded nanoparticle approach for identifying and differentiating G4 DNA molecules.
• To investigate the sensitivity of plasmonic properties to various G4 structural features.
• To establish a method for profiling G4 structures and distinguishing specific G4s, such as those from human telomeres.

Main Methods:

• Application of a synthetic G4 DNA-encoded gold nanoparticle system.
• Monitoring changes in plasmonic properties using UV/Vis spectroscopy.
• Systematic investigation of G4 structures, including stacking layers, loop sequences, capping bases, and topology.

Main Results:

• Plasmonic properties of gold nanoparticles are highly sensitive to diverse G4 structures.
• The method successfully differentiates G4 DNA molecules based on topology and nucleotide residues.
• Demonstrated ability to profile G4 structures and distinguish human telomeric G4s.

Conclusions:

• The G4 DNA-encoded gold nanoparticle approach provides a sensitive and accurate method for G4 structure profiling.
• This technique can distinguish between different G4 topologies and sequences.
• The developed method holds significant potential for broad applications in G4 research and diagnostics.