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Multiplexed DNA Identification Using Site Specific dCas9 Barcodes and Nanopore Sensing.

Nicole E Weckman1, Niklas Ermann1, Richard Gutierrez2

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Summary

Researchers developed a DNA barcoding method using dCas9 probes and nanopore sensors for rapid, specific DNA analysis. This technique allows for multiplexed DNA sensing in complex samples, offering an alternative to full DNA sequencing.

Keywords:
Cas9DNA barcodebiosensornanopore sensingsingle-molecule detection

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Area of Science:

  • Molecular Biology
  • Nanotechnology
  • Genomics

Background:

  • Traditional DNA sequencing can be time-consuming and resource-intensive.
  • Nanopore sensors offer label-free, single-molecule detection by analyzing ionic current signatures.
  • CRISPR-Cas9 systems, particularly dCas9, can be engineered for targeted DNA binding.

Purpose of the Study:

  • To demonstrate the use of dCas9 probes for creating unique DNA barcodes.
  • To show that these dCas9 barcodes can be read by solid-state nanopore sensors.
  • To develop a method for multiplexed DNA sensing in complex samples.

Main Methods:

  • Decorating double-stranded DNA with dCas9 probes at specific target sequences.
  • Utilizing solid-state nanopore sensors to detect patterns in ionic current signatures generated by dCas9 binding.
  • Targeting single and multiple dCas9 probes to DNA strands up to 48 kbp long.

Main Results:

  • Successfully created distinct DNA barcodes using single, double, and triple dCas9 probes.
  • Demonstrated effective measurement of dCas9-bound DNA in high salt conditions suitable for nanopore sensing.
  • Achieved simultaneous identification of two different DNA targets within a mixed bacterial DNA sample using barcode patterns.

Conclusions:

  • dCas9-mediated DNA barcoding is a viable strategy for rapid and highly specific DNA analysis.
  • Nanopore sensing effectively reads these dCas9-generated barcodes for molecular identification.
  • This method provides a versatile platform for multiplexed DNA sensing in complex biological samples.