Sequencing by avidity enables high accuracy with low reagent consumption.

Area of Science:

• Genomics
• Molecular Biology
• Biotechnology

Background:

• Accurate DNA sequencing is crucial for genomic research and diagnostics.
• Existing sequencing chemistries face challenges with efficiency and accuracy, particularly in homopolymer regions.

Purpose of the Study:

• To introduce and characterize avidity sequencing, a novel sequencing chemistry.
• To demonstrate the enhanced accuracy and stability of avidity sequencing.

Main Methods:

• Developed avidity sequencing chemistry optimizing DNA template stepping and nucleotide identification.
• Utilized multivalent nucleotide ligands on dye-labeled cores for polymerase-polymer-nucleotide complexes.
• Bound complexes to clonal DNA targets, forming "avidites".

Main Results:

• Avidity sequencing significantly reduced reporting nucleotide concentration requirements (micromolar to nanomolar).
• Achieved high accuracy: 96.2% of base calls with 1 error/1,000 bp and 85.4% with 1 error/10,000 bp.
• Demonstrated stable error rates even after long homopolymer sequences.

Conclusions:

• Avidity sequencing offers a highly accurate and robust method for DNA sequencing.
• The "avidites" approach enhances nucleotide binding and reduces dissociation, improving overall performance.
• This technology has the potential to advance genomic applications requiring high-fidelity DNA analysis.