Abstract
This article reviews the chemical methods for preparation of base-modified DNA with a particular focus on thiobases. Thiobases have certain unique properties, such as easy alkylation, ready oxidation and strong absorption in the near UV longer wavelength. These chemical and physical properties are retained in DNA containing thiobase and are useful for chemical manipulation and photo crosslinking of these modified DNA with other biomolecules of interest. The ability to make DNA containing thiobases or their functionalized analogues has added new research tools for DNA repair studies, and it is believed that such modified DNA can be of great use in many biological studies.
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