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Related Experiment Video

Updated: Mar 21, 2026

Visualization of miniSOG Tagged DNA Repair Proteins in Combination with Electron Spectroscopic Imaging ESI

Visualization of miniSOG Tagged DNA Repair Proteins in Combination with Electron Spectroscopic Imaging ESI

Published on: September 24, 2015

Nucleotide-Specific Contrast for DNA Sequencing by Electron Spectroscopy.

Marian Mankos¹, Henrik H J Persson², Alpha T N'Diaye³

¹Electron Optica Inc., 1000 Elwell Court #110, Palo Alto, California, 94303, United States of America.

|May 6, 2016

Summary

Electron microscopy offers label-free DNA sequencing potential. New spectroscopic methods enhance contrast, distinguishing nucleotides without damaging labels, paving the way for accurate, long-read DNA sequencing.

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Area of Science:

Biophysics
Nanotechnology
Genomics

Background:

Electron microscopy for DNA sequencing faces challenges like low contrast and radiation damage.
Previous methods required heavy atom labeling, increasing error rates.
Low-energy electron scattering showed promise in reducing DNA beam damage.

Purpose of the Study:

To explore label-free DNA sequencing using electron microscopy.
To investigate methods for enhancing nucleotide contrast without damaging labels.
To assess the feasibility of X-ray photoelectron and Auger electron spectroscopy for this application.

Main Methods:

Utilized X-ray photoelectron spectroscopy (XPS) and Auger electron spectroscopy (AES).
Employed low-energy electron microscopy (LEEM).
Tested spectroscopic techniques on bulk DNA samples with individual base monomers.

Main Results:

Both XPS and AES provided contrast mechanisms to distinguish individual nucleotides.
Label-free distinction of nucleotides was achieved without amplification.
Spectroscopic techniques were successfully implemented in a low-energy electron microscope.

Conclusions:

XPS and AES can enable label-free DNA sequencing by direct imaging.
Low-energy electron microscopy with these spectroscopic techniques offers a promising approach.
This method may overcome limitations of previous electron microscopy-based DNA sequencing attempts.