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Related Experiment Video

Updated: Jun 5, 2026

Determining if DNA Stained with a Cyanine Dye Can Be Digested with Restriction Enzymes
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Published on: February 2, 2018

Optical mapping of DNA: single-molecule-based methods for mapping genomes.

Robert K Neely1, Jochem Deen, Johan Hofkens

  • 1Departement Chemie, Katholieke Universiteit Leuven, Celestijnenlaan 200F, B-3001 Heverlee, Belgium. Robert.neely@chem.kuleuven.be

Biopolymers
|January 6, 2011
PubMed
Summary

Optical mapping provides long-range genomic context to complement short DNA sequencing reads. This review explores three enzymatic methods—restriction enzymes, nicking enzymes, and methyltransferases—for advanced DNA mapping and genome assembly.

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Last Updated: Jun 5, 2026

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Area of Science:

  • Genomics
  • Molecular Biology
  • Biotechnology

Background:

  • DNA sequencing technologies are rapidly advancing, offering faster and cheaper methods.
  • Current sequencing platforms generate short DNA fragments (<1000 bases), limiting long-range genomic information.
  • Optical mapping aims to bridge this gap by providing long-range genomic context for sequence assembly.

Purpose of the Study:

  • To review enzymatic approaches for optical DNA mapping.
  • To highlight how optical mapping complements DNA sequencing.
  • To discuss advancements in high-throughput and high-precision mapping.

Main Methods:

  • Review of three enzymatic strategies for optical mapping: restriction enzymes, nicking enzymes, and methyltransferase enzymes.
  • Discussion of DNA cleavage, fluorescent labeling, and ultrahigh-density labeling techniques.
  • Integration of optical mapping with nanofluidic technologies for improved throughput.

Main Results:

  • Restriction enzymes were used for initial DNA cleavage-based optical mapping.
  • Nicking enzymes enable sequence-specific fluorescent labeling for in-solution imaging and high-throughput mapping.
  • Methyltransferase enzymes allow for ultrahigh-density DNA labeling with subdiffraction-limit precision.

Conclusions:

  • Enzymatic optical mapping provides a crucial scaffold for DNA sequence assembly.
  • Advancements in enzymatic labeling and nanofluidics are driving new high-throughput mapping capabilities.
  • Emerging techniques offer unprecedented precision in genomic mapping.