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Ku DNA end-binding protein modulates homologous repair of double-strand breaks in mammalian cells

Open access
Pierce, Andrew J., Hu, Peng, Han, Mingguang, Ellis, Nathan, Jasin, Maria·2001·Genes & Development

Abstract

Chromosomal double-strand breaks (DSBs) in mammalian cells are repaired by either homology-directed repair (HDR), using a homologous sequence as a repair template, or nonhomologous end-joining (NHEJ), which often involves sequence alterations at the DSB site. To characterize the interrelationship of these two pathways, we analyzed HDR of a DSB in cells deficient for NHEJ components. We find that the HDR frequency is enhanced in Ku70−/−,XRCC4−/−, and DNA-PKcs−/−cells, with the increase being particularly striking in Ku70−/− cells. Neither sister-chromatid exchange nor gene-targeting frequencies show a dependence on these NHEJ proteins. A Ku-modulated two-ended versus one-ended chromosome break model is presented to explain these results.

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Metadata

Authors
Pierce, A. J., Hu, P., Han, M., Ellis, N., & Jasin, M.
Venue
Genes & Development
Published
2001-12-15
Volume
15
Issue
24
Pages
3237-3242
ISSN
  • 0890-9369 (ISSN-L)
  • 1549-5477
OpenAlex
W2007919127
Cited by
514
References
2
Type
posted content
Language
en
Open access
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CoChat. (2026). Citation check: Ku DNA end-binding protein modulates homologous repair of double-strand breaks in mammalian cells. https://app.cochat.ai/papers/10.1101/gad.946401
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Pierce, A. J., Hu, P., Han, M., Ellis, N., & Jasin, M. (2001). Ku DNA end-binding protein modulates homologous repair of double-strand breaks in mammalian cells. Genes & Development. https://doi.org/10.1101/gad.946401

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