Structure-specific endonucleases Xpf and Mus81 play overlapping but essential roles in DNA repair by homologous recombination

Koji Kikuchi, Takeo Narita, Van T. Pham, Junko Iijima, Kouji Hirota, Islam Shamima Keka, Mohiuddin, Katsuya Okawa, Tetsuya Hori, Tatsuo Fukagawa, Jeroen Essers, Roland Kanaar, Matthew C. Whitby, Kaoru Sugasawa, Yoshihito Taniguchi, Katsumi Kitagawa, Shunichi Takeda

Research output: Contribution to journalArticle

15 Citations (Scopus)

Abstract

DNA double-strand breaks (DSB) occur frequently during replication in sister chromatids and are dramatically increased when cells are exposed to chemotherapeutic agents including camptothecin. Such DSBs are efficiently repaired specifically by homologous recombination (HR) with the intact sister chromatid. HR, therefore, plays pivotal roles in cellular proliferation and cellular tolerance to camptothecin. Mammalian cells carry several structure-specific endonucleases, such as Xpf-Ercc1 and Mus81-Eme1, in which Xpf and Mus81 are the essential subunits for enzymatic activity. Here, we show the functional overlap between Xpf and Mus81 by conditionally inactivating Xpf in the chicken DT40 cell line, which has no Mus81 ortholog. Although mammalian cells deficient in either Xpf or Mus81 are viable, Xpf inactivation in DT40 cells was lethal, resulting in a marked increase in the number of spontaneous chromosome breaks. Similarly, inactivation of both Xpf and Mus81 in human HeLa cells and murine embryonic stem cells caused numerous spontaneous chromosome breaks. Furthermore, the phenotype of Xpf-deficient DT40 cells was reversed by ectopic expression of human Mus81-Eme1 or human Xpf-Ercc1 heterodimers. These observations indicate the functional overlap of Xpf-Ercc1 and Mus81-Eme1 in the maintenance of genomic DNA. Both Mus81-Eme1 and Xpf-Ercc1 contribute to the completion of HR, as evidenced by the data that the expression of Mus81-Eme1 or Xpf-Ercc1 diminished the number of camptothecin-induced chromosome breaks in Xpf-deficient DT40 cells, and to preventing early steps in HR by deleting XRCC3 suppressed the nonviability of Xpf-deficient DT40 cells. In summary, Xpf and Mus81 have a substantially overlapping function in completion of HR.

Original languageEnglish (US)
Pages (from-to)4362-4371
Number of pages10
JournalCancer Research
Volume73
Issue number14
DOIs
StatePublished - Jul 15 2013
Externally publishedYes

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Recombinational DNA Repair
Endonucleases
Homologous Recombination
Chromosome Breakage
Camptothecin
Chromatids
Double-Stranded DNA Breaks
Embryonic Stem Cells
HeLa Cells
Chickens
Maintenance
Cell Proliferation
Phenotype
Cell Line
DNA

ASJC Scopus subject areas

  • Oncology
  • Cancer Research

Cite this

Structure-specific endonucleases Xpf and Mus81 play overlapping but essential roles in DNA repair by homologous recombination. / Kikuchi, Koji; Narita, Takeo; Pham, Van T.; Iijima, Junko; Hirota, Kouji; Keka, Islam Shamima; Mohiuddin; Okawa, Katsuya; Hori, Tetsuya; Fukagawa, Tatsuo; Essers, Jeroen; Kanaar, Roland; Whitby, Matthew C.; Sugasawa, Kaoru; Taniguchi, Yoshihito; Kitagawa, Katsumi; Takeda, Shunichi.

In: Cancer Research, Vol. 73, No. 14, 15.07.2013, p. 4362-4371.

Research output: Contribution to journalArticle

Kikuchi, K, Narita, T, Pham, VT, Iijima, J, Hirota, K, Keka, IS, Mohiuddin, Okawa, K, Hori, T, Fukagawa, T, Essers, J, Kanaar, R, Whitby, MC, Sugasawa, K, Taniguchi, Y, Kitagawa, K & Takeda, S 2013, 'Structure-specific endonucleases Xpf and Mus81 play overlapping but essential roles in DNA repair by homologous recombination', Cancer Research, vol. 73, no. 14, pp. 4362-4371. https://doi.org/10.1158/0008-5472.CAN-12-3154
Kikuchi, Koji ; Narita, Takeo ; Pham, Van T. ; Iijima, Junko ; Hirota, Kouji ; Keka, Islam Shamima ; Mohiuddin ; Okawa, Katsuya ; Hori, Tetsuya ; Fukagawa, Tatsuo ; Essers, Jeroen ; Kanaar, Roland ; Whitby, Matthew C. ; Sugasawa, Kaoru ; Taniguchi, Yoshihito ; Kitagawa, Katsumi ; Takeda, Shunichi. / Structure-specific endonucleases Xpf and Mus81 play overlapping but essential roles in DNA repair by homologous recombination. In: Cancer Research. 2013 ; Vol. 73, No. 14. pp. 4362-4371.
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abstract = "DNA double-strand breaks (DSB) occur frequently during replication in sister chromatids and are dramatically increased when cells are exposed to chemotherapeutic agents including camptothecin. Such DSBs are efficiently repaired specifically by homologous recombination (HR) with the intact sister chromatid. HR, therefore, plays pivotal roles in cellular proliferation and cellular tolerance to camptothecin. Mammalian cells carry several structure-specific endonucleases, such as Xpf-Ercc1 and Mus81-Eme1, in which Xpf and Mus81 are the essential subunits for enzymatic activity. Here, we show the functional overlap between Xpf and Mus81 by conditionally inactivating Xpf in the chicken DT40 cell line, which has no Mus81 ortholog. Although mammalian cells deficient in either Xpf or Mus81 are viable, Xpf inactivation in DT40 cells was lethal, resulting in a marked increase in the number of spontaneous chromosome breaks. Similarly, inactivation of both Xpf and Mus81 in human HeLa cells and murine embryonic stem cells caused numerous spontaneous chromosome breaks. Furthermore, the phenotype of Xpf-deficient DT40 cells was reversed by ectopic expression of human Mus81-Eme1 or human Xpf-Ercc1 heterodimers. These observations indicate the functional overlap of Xpf-Ercc1 and Mus81-Eme1 in the maintenance of genomic DNA. Both Mus81-Eme1 and Xpf-Ercc1 contribute to the completion of HR, as evidenced by the data that the expression of Mus81-Eme1 or Xpf-Ercc1 diminished the number of camptothecin-induced chromosome breaks in Xpf-deficient DT40 cells, and to preventing early steps in HR by deleting XRCC3 suppressed the nonviability of Xpf-deficient DT40 cells. In summary, Xpf and Mus81 have a substantially overlapping function in completion of HR.",
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AU - Narita, Takeo

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AU - Iijima, Junko

AU - Hirota, Kouji

AU - Keka, Islam Shamima

AU - Mohiuddin,

AU - Okawa, Katsuya

AU - Hori, Tetsuya

AU - Fukagawa, Tatsuo

AU - Essers, Jeroen

AU - Kanaar, Roland

AU - Whitby, Matthew C.

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AU - Kitagawa, Katsumi

AU - Takeda, Shunichi

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