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DNA sequencing is a fundamental technique that is routinely used in the biological sciences. This method can be applied to a range of questions at different scales - from the sequencing of a cloned DNA fragment or the study of a mutation in a gene up to whole-genome sequencing. However, despite the widespread use of sequencing today, it was not until 1977 that Fredrick Sanger and his collaborators developed the chain-termination method to decode DNA sequences. It relies on the separation of a...
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Sequencing of mRNA from Whole Blood using Nanopore Sequencing
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Electrical DNA Sequence Mapping Using Oligodeoxynucleotide Labels and Nanopores.

Kaikai Chen1, Felix Gularek2, Boyao Liu1

  • 1Cavendish Laboratory, University of Cambridge, JJ Thomson Avenue, Cambridge CB3 0HE, United Kingdom.

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|January 22, 2021
PubMed
Summary
This summary is machine-generated.

This study introduces a novel nanopore-based method for DNA sequence mapping, enabling high-resolution detection of small labels on DNA. This all-electrical approach offers a promising alternative for rapid DNA species identification in point-of-care diagnostics.

Keywords:
AdoMet analogueDNA detectionDNA methyltransferasenanopore sensingsingle-molecule

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Area of Science:

  • Nanotechnology
  • Molecular Biology
  • Biophysics

Background:

  • DNA sequence mapping is vital for diagnostics, with current methods often relying on fluorescent labels and optical imaging.
  • Nanopore sensing offers an electrical measurement alternative, suitable for portable devices and high-resolution analysis.

Purpose of the Study:

  • To develop a high-resolution nanopore-based DNA sequence mapping technique.
  • To enable accurate localization of specific DNA sequence motifs for species identification.

Main Methods:

  • Labeling specific DNA sequence motifs with oligodeoxynucleotides (ODNs) using DNA methyltransferase (MTase).
  • Detecting labeled DNA using nanopores and analyzing signal changes related to DNA velocity.
  • Developing a data analysis method using ensemble statistics to determine motif locations.

Main Results:

  • Successfully detected ODNs as small as 11 nucleotides without additional reporters.
  • Resolved neighboring sites on a single DNA molecule with a minimum distance of 141 bp (approximately 48 nm).
  • Achieved high-accuracy localization of sequence motifs in an all-electrical format.

Conclusions:

  • The developed nanopore platform enables high-resolution detection and accurate localization of small DNA labels.
  • This all-electrical method provides a viable alternative to optical techniques for DNA species identification.
  • The technology shows promise for integration into miniature diagnostic devices.