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Mystery of DNA repair: the role of the MRN complex and ATM kinase in DNA damage repair

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Abstract

Genomes are subject to a number of exogenous or endogenous DNA-damaging agents that cause DNA double-strand breaks (DSBs). These critical DNA lesions can result in cell death or a wide variety of genetic alterations, including deletions, translocations, loss of heterozygosity, chromosome loss, or chromosome fusions, which enhance genome instability and can trigger carcinogenesis. The cells have developed an efficient mechanism to cope with DNA damages by evolving the DNA repair machinery. There are 2 major DSB repair mechanisms: nonhomologous end joining (NHEJ) and homologous recombination (HR). One element of the repair machinery is the MRN complex, consisting of MRE11, RAD50 and NBN (previously described as NBS1), which is involved in DNA replication, DNA repair, and signaling to the cell cycle checkpoints. A number of kinases, like ATM (ataxia-telangiectasia mutated), ATR (ataxia-telangiectasia and Rad-3-related), and DNA PKcs (DNA protein kinase catalytic subunit), phosphorylate various protein targets in order to repair the damage. If the damage cannot be repaired, they direct the cell to apoptosis. The MRN complex as well as repair kinases are also involved in telomere maintenance and genome stability. The dysfunction of particular elements involved in the repair mechanisms leads to genome instability disorders, like ataxia telangiectasia (A-T), A-T-like disorder (ATLD) and Nijmegen breakage syndrome (NBS). The mutated genes responsible for these disorders code for proteins that play key roles in the process of DNA repair. Here we present a detailed review of current knowledge on the MRN complex, kinases engaged in DNA repair, and genome instability disorders.

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Authors and Affiliations

  1. Department of Medical Genetics, The Children’s Memorial Health Institute, Al. Dzieci Polskich 20, 04-730, Warszawa, Poland

    Kamila Czornak & Krystyna H. Chrzanowska

  2. Institute of Human Genetics, Charité-University Medicine Berlin, Berlin, Germany

    Sanaullah Chughtai

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  1. Kamila Czornak
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  2. Sanaullah Chughtai
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  3. Krystyna H. Chrzanowska
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Correspondence to Krystyna H. Chrzanowska.

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Czornak, K., Chughtai, S. & Chrzanowska, K.H. Mystery of DNA repair: the role of the MRN complex and ATM kinase in DNA damage repair. J Appl Genet 49, 383–396 (2008). https://doi.org/10.1007/BF03195638

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  • DOI: https://doi.org/10.1007/BF03195638

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