Miklós Veres

1 Introduction Destructive epigenetic modification of DNA can be promoted by both endogenous and exogenous factors, affecting the nucleobases as well as the backbone. A wide variety of chemical alterations to the nucleobases are known, with substitutions possible on almost all atoms of the heterocycles [1, 2]. If natural repair processes of abnormal modifications fail, such damage can lead, for instance, to the development of cellular degeneration, cancer, or genetic disorders and defects.

Conflicts of Interest The authors declare no conflicts of interest. Data Availability Statement The data that support the findings of this study are available from the corresponding author upon reasonable request. References 1, , , and , “Low Acoustic Loss Chalcogenide Glasses - a New Category of Materials for Acoustic and Acousto-Optic Applications,” Applied Physics Letters 17 (1970): 367–368, https://doi.org/10.1063/1.1653438.