Related Experiment Video
Updated: Dec 15, 2025
09:43
Fine-tuning the Size and Minimizing the Noise of Solid-state Nanopores
Published on: October 31, 2013
14.0K
A dual-constriction biological nanopore resolves homonucleotide sequences with high fidelity
Sander E Van der Verren1,2, Nani Van Gerven1,2, Wim Jonckheere1,2
1Structural Biology Brussels, Vrije Universiteit Brussel, Brussels, Belgium.
Nature Biotechnology
|July 8, 2020
Summary
This study introduces a dual-constriction nanopore for DNA sequencing, enhancing accuracy in homopolymer regions. The novel CsgG-CsgF protein pore significantly improves base-calling for repetitive DNA sequences.
Area of Science:
- Biotechnology
- Nanotechnology
- Genomics
Background:
- Single-molecule nanopore DNA sequencing offers high throughput but struggles with accuracy in homopolymer regions.
- Biological nanopores, like CsgG, are promising but require improvements for reliable homopolymer sequencing.
Purpose of the Study:
- To engineer a novel dual-constriction nanopore by combining CsgG with CsgF.
- To enhance signal and base-calling accuracy for homopolymer regions in DNA sequencing.
Main Methods:
- Structural analysis using electron cryo-microscopy of CsgG and CsgF complex.
- Fabrication and testing of a prototype CsgG-CsgF protein pore for DNA translocation.
- Assessment of DNA sequencing accuracy in homopolymer regions.
Main Results:
- A dual-constriction pore was formed by CsgF binding within the CsgG nanopore.
- Both constrictions were shown to modulate the electrical signal during DNA translocation.
- Single-read accuracy in homopolymers (up to 9 nucleotides) improved by 25-70%.
Conclusions:
- The CsgG-CsgF dual-constriction nanopore significantly improves homopolymer sequencing accuracy.
- This engineered nanopore represents a breakthrough for reliable long-read DNA sequencing.
- The findings pave the way for more accurate and efficient genomic analyses.
