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The FANCM-BLM-TOP3A-RMI complex suppresses alternative lengthening of telomeres (ALT)

Author

Listed:
  • Robert Lu

    (University of Sydney)

  • Julienne J. O’Rourke

    (St. Vincent’s Institute
    University of Melbourne)

  • Alexander P. Sobinoff

    (University of Sydney)

  • Joshua A. M. Allen

    (University of Sydney)

  • Christopher B. Nelson

    (University of Sydney)

  • Christopher G. Tomlinson

    (University of Sydney)

  • Michael Lee

    (University of Sydney)

  • Roger R. Reddel

    (University of Sydney)

  • Andrew J. Deans

    (St. Vincent’s Institute
    University of Melbourne)

  • Hilda A. Pickett

    (University of Sydney)

Abstract

The collapse of stalled replication forks is a major driver of genomic instability. Several committed mechanisms exist to resolve replication stress. These pathways are particularly pertinent at telomeres. Cancer cells that use Alternative Lengthening of Telomeres (ALT) display heightened levels of telomere-specific replication stress, and co-opt stalled replication forks as substrates for break-induced telomere synthesis. FANCM is a DNA translocase that can form independent functional interactions with the BLM-TOP3A-RMI (BTR) complex and the Fanconi anemia (FA) core complex. Here, we demonstrate that FANCM depletion provokes ALT activity, evident by increased break-induced telomere synthesis, and the induction of ALT biomarkers. FANCM-mediated attenuation of ALT requires its inherent DNA translocase activity and interaction with the BTR complex, but does not require the FA core complex, indicative of FANCM functioning to restrain excessive ALT activity by ameliorating replication stress at telomeres. Synthetic inhibition of FANCM-BTR complex formation is selectively toxic to ALT cancer cells.

Suggested Citation

  • Robert Lu & Julienne J. O’Rourke & Alexander P. Sobinoff & Joshua A. M. Allen & Christopher B. Nelson & Christopher G. Tomlinson & Michael Lee & Roger R. Reddel & Andrew J. Deans & Hilda A. Pickett, 2019. "The FANCM-BLM-TOP3A-RMI complex suppresses alternative lengthening of telomeres (ALT)," Nature Communications, Nature, vol. 10(1), pages 1-14, December.
    • Handle: RePEc:nat:natcom:v:10:y:2019:i:1:d:10.1038_s41467-019-10180-6
    DOI: 10.1038/s41467-019-10180-6
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    Cited by:

    1. Sile F. Yang & Christopher B. Nelson & Jadon K. Wells & Madushan Fernando & Robert Lu & Joshua A. M. Allen & Lisa Malloy & Noa Lamm & Vincent J. Murphy & Joel P. Mackay & Andrew J. Deans & Anthony J. , 2024. "ZNF827 is a single-stranded DNA binding protein that regulates the ATR-CHK1 DNA damage response pathway," Nature Communications, Nature, vol. 15(1), pages 1-15, December.
    2. Chia-Yu Guh & Hong-Jhih Shen & Liv WeiChien Chen & Pei-Chen Chiu & I-Hsin Liao & Chen-Chia Lo & Yunfei Chen & Yu-Hung Hsieh & Ting-Chia Chang & Chien-Ping Yen & Yi-Yun Chen & Tom Wei-Wu Chen & Liuh-Yo, 2022. "XPF activates break-induced telomere synthesis," Nature Communications, Nature, vol. 13(1), pages 1-19, December.
    3. Frances Karla Kusuma & Aishvaryaa Prabhu & Galen Tieo & Syed Moiz Ahmed & Pushkar Dakle & Wai Khang Yong & Elina Pathak & Vikas Madan & Yan Yi Jiang & Wai Leong Tam & Dennis Kappei & Peter Dröge & H. , 2023. "Signalling inhibition by ponatinib disrupts productive alternative lengthening of telomeres (ALT)," Nature Communications, Nature, vol. 14(1), pages 1-15, December.
    4. Ilaria Rosso & Corey Jones-Weinert & Francesca Rossiello & Matteo Cabrini & Silvia Brambillasca & Leonel Munoz-Sagredo & Zeno Lavagnino & Emanuele Martini & Enzo Tedone & Massimiliano Garre’ & Julio A, 2023. "Alternative lengthening of telomeres (ALT) cells viability is dependent on C-rich telomeric RNAs," Nature Communications, Nature, vol. 14(1), pages 1-16, December.
    5. S. Cohen & A. Guenolé & I. Lazar & A. Marnef & T. Clouaire & D. V. Vernekar & N. Puget & V. Rocher & C. Arnould & M. Aguirrebengoa & M. Genais & N. Firmin & R. A. Shamanna & R. Mourad & V. A. Bohr & V, 2022. "A POLD3/BLM dependent pathway handles DSBs in transcribed chromatin upon excessive RNA:DNA hybrid accumulation," Nature Communications, Nature, vol. 13(1), pages 1-15, December.
    6. Fei Li & Yizhe Wang & Inah Hwang & Ja-Young Jang & Libo Xu & Zhong Deng & Eun Young Yu & Yiming Cai & Caizhi Wu & Zhenbo Han & Yu-Han Huang & Xiangao Huang & Ling Zhang & Jun Yao & Neal F. Lue & Paul , 2023. "Histone demethylase KDM2A is a selective vulnerability of cancers relying on alternative telomere maintenance," Nature Communications, Nature, vol. 14(1), pages 1-16, December.

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