New polyanionic modifications of polyamide nucleic acid mimics were obtained. Thymine decamers were synthesized from respective chiral α- and γ-monomers, and their enantiomeric purity was assessed. Here, we present the decamer synthesis, purification and characterization by MALDI-TOF mass spectrometry and an investigation of the hybridization properties of the decamers. We show that the modified γ-S-carboxyethyl-T10 PNA forms a stable triplex with polyadenine DNA.

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The review presents currently available data on the biological role of 8-oxo-2'-deoxyguanosine. This compound has been successfully and for a long time used as a biomarker of oxidative stress and diseases associated with it. However, in recent years an increasing number of publications has appeared reporting that 8-oxo-dG is not simply a byproduct of oxidation processes, but is of great biological importance. It is assumed that it is involved in the regulation of gene expression, in some processes of DNA repair, in the control of inflammatory and autoimmune reactions, and in the activation of antioxidant systems. Probably there is a prospect of applying 8-oxo-2'-deoxyguanosine as a drug.

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