Journal of Applied Genetics

, Volume 49, Issue 4, pp 383–396 | Cite as

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

  • Kamila Czornak
  • Sanaullah Chughtai
  • Krystyna H. Chrzanowska
Review Article


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.


ATM kinase ATR kinase DNA damage homologous recombination MRN complex nonhomologous end joining 


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Copyright information

© Institute of Plant Genetics, Polish Academy of Sciences, Poznan 2008

Authors and Affiliations

  • Kamila Czornak
    • 1
  • Sanaullah Chughtai
    • 2
  • Krystyna H. Chrzanowska
    • 1
  1. 1.Department of Medical GeneticsThe Children’s Memorial Health InstituteWarszawaPoland
  2. 2.Institute of Human GeneticsCharité-University Medicine BerlinBerlinGermany

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