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Published on: June 3, 2019
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Real-time single-molecule electronic DNA sequencing by synthesis using polymer-tagged nucleotides on a nanopore array
Carl W Fuller1, Shiv Kumar2, Mintu Porel2
1Center for Genome Technology and Biomolecular Engineering, Columbia University, New York, NY 10027; Department of Chemical Engineering, Columbia University, New York, NY 10027; Genia Technologies, Santa Clara, CA 95050;
Summary
This study introduces a novel nanopore DNA sequencing method using polymer-tagged nucleotides. This electronic sequencing by synthesis approach achieves single-molecule, single-base resolution for accurate DNA sequence determination.
Area of Science:
- Molecular Biology
- Nanotechnology
- Biophysics
Background:
- DNA sequencing by synthesis (SBS) is a key technology for genetic analysis.
- Existing SBS methods face limitations in throughput and resolution.
- Single-molecule nanopore sequencing offers a promising alternative for high-resolution DNA analysis.
Purpose of the Study:
- To develop and validate a novel single-molecule, nanopore-based DNA sequencing by synthesis (SBS) strategy.
- To utilize polymer-tagged nucleotides for electronic detection of DNA bases during synthesis.
- To achieve real-time, single-base resolution DNA sequencing using a nanopore array platform.
Main Methods:
- Synthesized and characterized oligonucleotide-based polymer-tagged nucleotides.
- Attached DNA polymerase to an α-hemolysin nanopore array.
- Inserted polymerase-nanopore conjugates into lipid bilayers for electronic measurements.
- Measured distinct electrical current blockade levels corresponding to different tagged nucleotides during DNA synthesis.
Main Results:
- Demonstrated that polymer-tagged nucleotides are active substrates for DNA polymerase.
- Observed clearly distinguishable and sequence-specific electrical current blockade levels for four different polymer tags.
- Obtained real-time, single-molecule electronic DNA sequencing data with single-base resolution.
Conclusions:
- The developed nanopore SBS strategy enables accurate DNA sequencing at the single-molecule level.
- Polymer-tagged nucleotides combined with nanopore technology offer a new avenue for high-throughput DNA sequencing.
- This approach has the potential to significantly advance genetic analysis and molecular diagnostics.
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