Molecules 2011, 16(9), 7980-7993; doi:10.3390/molecules16097980
Review

Thymidine Analogues for Tracking DNA Synthesis

1,†, 1,†, 1,2 and 1,* email
Received: 31 August 2011; Accepted: 8 September 2011 / Published: 15 September 2011
(This article belongs to the Special Issue Nucleoside Analogues)
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
Abstract: Replicating cells undergo DNA synthesis in the highly regulated, S-phase of the cell cycle. Analogues of the pyrimidine deoxynucleoside thymidine may be inserted into replicating DNA, effectively tagging dividing cells allowing their characterisation. Tritiated thymidine, targeted using autoradiography was technically demanding and superseded by 5-bromo-2-deoxyuridine (BrdU) and related halogenated analogues, detected using antibodies. Their detection required the denaturation of DNA, often constraining the outcome of investigations. Despite these limitations BrdU alone has been used to target newly synthesised DNA in over 20,000 reviewed biomedical studies. A recent breakthrough in “tagging DNA synthesis” is the thymidine analogue 5-ethynyl-2′-deoxyuridine (EdU). The alkyne group in EdU is readily detected using a fluorescent azide probe and copper catalysis using ‘Huisgen’s reaction’ (1,3-dipolar cycloaddition or ‘click chemistry’). This rapid, two-step biolabelling approach allows the tagging and imaging of DNA within cells whilst preserving the structural and molecular integrity of the cells. The bio-orthogonal detection of EdU allows its application in more experimental assays than previously possible with other “unnatural bases”. These include physiological, anatomical and molecular biological experimentation in multiple fields including, stem cell research, cancer biology, and parasitology. The full potential of EdU and related molecules in biomedical research remains to be explored.
Keywords: DNA synthesis; EdU (5-ethynyl-2′-deoxyuridine); nucleoside analogues
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MDPI and ACS Style

Cavanagh, B.L.; Walker, T.; Norazit, A.; Meedeniya, A.C. Thymidine Analogues for Tracking DNA Synthesis. Molecules 2011, 16, 7980-7993.

AMA Style

Cavanagh BL, Walker T, Norazit A, Meedeniya AC. Thymidine Analogues for Tracking DNA Synthesis. Molecules. 2011; 16(9):7980-7993.

Chicago/Turabian Style

Cavanagh, Brenton L.; Walker, Tom; Norazit, Anwar; Meedeniya, Adrian C.B. 2011. "Thymidine Analogues for Tracking DNA Synthesis." Molecules 16, no. 9: 7980-7993.

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