Abstract
The base excision repair (BER) pathway is essential for maintaining the stability of DNA in all organisms and defects in this process are associated with life-threatening diseases. It is involved in removing specific types of DNA lesions that are induced by both exogenous and endogenous genotoxic substances. BER is a multi-step mechanism that is often initiated by the removal of a damaged base leading to a genotoxic intermediate that is further processed before the reinsertion of the correct nucleotide and the restoration of the genome to a stable structure. Studies in human and yeast cells, as well as fruit fly and nematode worms, have played important roles in identifying the components of this conserved DNA repair pathway that maintains the integrity of the eukaryotic genome. This review will focus on the components of base excision repair, namely, the DNA glycosylases, the apurinic/apyrimidinic endonucleases, the DNA polymerase, and the ligases, as well as other protein cofactors. Functional insights into these conserved proteins will be provided from humans, Saccharomyces cerevisiae, Drosophila melanogaster, and Caenorhabditis elegans, and the implications of genetic polymorphisms and knockouts of the corresponding genes.
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Acknowledgements
We thank the College of Health and Life Sciences, Hamad Bin Khalifa University, for providing scholarships to both N.N.H and N.E. The schematic representations were created using Biorender.com.
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Qatar Foundation to the College of Health and Life Sciences, Hamad Bin Khalifa University, Education City, Doha, Qatar.
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NNH, wrote the entire manuscript using a draft provided by NE; NNH, prepared the Tables and Figures and completed the reference list; DR, extensively revised the complete manuscript and both DR and NNH finalized the manuscript.
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Hindi, N.N., Elsakrmy, N. & Ramotar, D. The base excision repair process: comparison between higher and lower eukaryotes. Cell. Mol. Life Sci. 78, 7943–7965 (2021). https://doi.org/10.1007/s00018-021-03990-9
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DOI: https://doi.org/10.1007/s00018-021-03990-9