Cited by 720DNA Repair MechanismsEffects of Radiation ExposureCRISPR and Genetic Engineering

The mechanism of human nonhomologous DNA end joining

Open access
Lieber, Michael R.·2008·Journal of Biological Chemistry

Abstract

Double-strand breaks are common in all living cells, and there are two major pathways for their repair. In eukaryotes, homologous recombination is restricted to late S or G(2), whereas nonhomologous DNA end joining (NHEJ) can occur throughout the cell cycle and is the major pathway for the repair of double-strand breaks in multicellular eukaryotes. NHEJ is distinctive for the flexibility of the nuclease, polymerase, and ligase activities that are used. This flexibility permits NHEJ to function on the wide range of possible substrate configurations that can arise when double-strand breaks occur, particularly at sites of oxidative damage or ionizing radiation. NHEJ does not return the local DNA to its original sequence, thus accounting for the wide range of end results. Part of this heterogeneity arises from the diversity of the DNA ends, but much of it arises from the many alternative ways in which the nuclease, polymerases, and ligase can act during NHEJ. Physiologic double-strand break processes make use of the imprecision of NHEJ in generating antigen receptor diversity. Pathologically, the imprecision of NHEJ contributes to genome mutations that arise over time.

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  • NHEJ arises from faulty repair of DNA double-strand breaks and is more error-prone than NAHR.

    “NHEJ occurs as a result of the aberrant repair of DNA double strand breaks and is guided entirely by the information contained within or near the DNA lesion for repair, which makes it error prone as compared to NAHR (Lieber, 2008) (Figure 2B).”

    From CNVs: Harbingers of a Rare Variant Revolution in Psychiatric Genetics (2012) · cites this paper as Lieber, 2008

  • In most circumstances, NHEJ is the predominant repair mechanism for DSBs generated by ZFNs, and this repair pathway is attended with nucleotide insertions, deletions or frame-shift mutation leading to gene disruption.

    “However, the HR pathway needs an externally provided homologous DNA template; and thus in most circumstances, NHEJ is the predominant repair mechanism for DSBs generated by ZFNs. This repair pathway is attended with nucleotide insertions, deletions or frame-shift mutation [22], leading to gene disruption.”

    From Newer Gene Editing Technologies toward HIV Gene Therapy (2013) · cites this paper as [22]

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Research works printed but not linked: 2

  1. Adachi, N., Ishino, T., Ishii, Y., Takeda, S., and Koyama, H. (2001) Proc. Natl. Acad. Sci. U. S. A. 98, 12109 -12113
  2. Tsai, C. J., Kim, S. A., and Chu, G. (2007) Proc. Natl. Acad. Sci. U. S. A. 104, 7851-7856

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Authors
Lieber, M. R.
Affiliations
University of Southern California (US)
Corresponding author
Lieber, Michael R.
Venue
Journal of Biological Chemistry
Publisher
Elsevier BV
Published
2008-01
Volume
283
Issue
1
Pages
1-5
ISSN
0021-9258 (ISSN-L)
OpenAlex
W1965531809
Cited by
720
References
56
Citations by year
2026: 14 · 2025: 28 · 2024: 27 · 2023: 26 · 2022: 31 · 2021: 36 · 2020: 37 · 2019: 29 · 2018: 27 · 2017: 34 · 2016: 35 · 2015: 53 · 2014: 46 · 2013: 45 · 2012: 49
FWCI
3.77
Type
journal article
Language
en
Open access
Locations
  • Journal of Biological Chemistry (publishedVersion, cc-by)
  • PubMed (publishedVersion)
Topics
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › DNA Repair Mechanisms
  • Health Sciences › Medicine › Radiology, Nuclear Medicine and Imaging › Effects of Radiation Exposure
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › CRISPR and Genetic Engineering
Keywords
non-homologous end joining, DNA double-strand break repair, DNA ligase IV, DNA polymerase IV, DNA nuclease activity, oxidative DNA damage, ionizing radiation, antigen receptor diversity, genomic instability, homologous recombination
MeSH terms
DNA-Directed DNA Polymerase, DNA Repair, DNA Helicases, Humans, Models, Biological, DNA Ligases, DNA Repair Enzymes, DNA Breaks, Double-Stranded

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