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Updated: May 29, 2026

Immunofluorescent Detection of Two Thymidine Analogues (CldU and IdU) in Primary Tissue
10:55

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Published on: December 7, 2010

Thymidine analogues for tracking DNA synthesis.

Brenton L Cavanagh1, Tom Walker, Anwar Norazit

  • 1Health Institute and Eskitis Institute, Griffith University, Queensland 4107, Australia.

Molecules (Basel, Switzerland)
|September 17, 2011
PubMed
Summary
This summary is machine-generated.

A new thymidine analogue, 5-ethynyl-2'-deoxyuridine (EdU), offers a faster and gentler method for tagging replicating DNA. This breakthrough enables better cell characterization in various biomedical research fields.

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08:37

Use of the Pyrimidine Analog, 5-Iodo-2′-Deoxyuridine (IdU) with Cell Cycle Markers to Establish Cell Cycle Phases in a Mass Cytometry Platform

Published on: October 22, 2021

Area of Science:

  • Biochemistry
  • Molecular Biology
  • Cell Biology

Background:

  • Cell replication involves DNA synthesis during the S-phase.
  • Thymidine analogues can be incorporated into newly synthesized DNA to label dividing cells.
  • Previous methods like tritiated thymidine and 5-bromo-2-deoxyuridine (BrdU) had limitations, including DNA denaturation.

Purpose of the Study:

  • To introduce and evaluate 5-ethynyl-2 -deoxyuridine (EdU) as an advanced thymidine analogue for labeling DNA synthesis.
  • To highlight the advantages of EdU detection via click chemistry over existing methods.

Main Methods:

  • EdU, a thymidine analogue with an alkyne group, is incorporated into newly synthesized DNA.
  • Detection of EdU is achieved using a fluorescent azide probe and copper-catalyzed click chemistry (1,3-dipolar cycloaddition).
  • This bio-orthogonal method allows rapid, two-step labeling and imaging while preserving cellular integrity.

Main Results:

  • EdU labeling is significantly faster and less disruptive than traditional methods.
  • The click chemistry detection preserves cellular structure and molecular components.
  • EdU facilitates broader applications in various experimental assays compared to BrdU.

Conclusions:

  • EdU represents a significant advancement in labeling DNA synthesis, offering a more versatile and less invasive technique.
  • Its bio-orthogonal nature expands possibilities for physiological, anatomical, and molecular studies.
  • EdU holds great potential for diverse biomedical research areas, including stem cell biology, cancer research, and parasitology.