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Retrotransposons hijack alt-EJ for DNA replication and eccDNA biogenesis

Author

Listed:
  • Fu Yang

    (Duke University School of Medicine)

  • Weijia Su

    (Duke University School of Medicine)

  • Oliver W. Chung

    (Duke University School of Medicine)

  • Lauren Tracy

    (Duke University School of Medicine)

  • Lu Wang

    (Duke University School of Medicine
    Chinese Academy of Sciences)

  • Dale A. Ramsden

    (University of North Carolina at Chapel Hill)

  • ZZ Zhao Zhang

    (Duke University School of Medicine
    Duke University School of Medicine)

Abstract

Retrotransposons are highly enriched in the animal genome1–3. The activation of retrotransposons can rewrite host DNA information and fundamentally impact host biology1–3. Although developmental activation of retrotransposons can offer benefits for the host, such as against virus infection, uncontrolled activation promotes disease or potentially drives ageing1–5. After activation, retrotransposons use their mRNA as templates to synthesize double-stranded DNA for making new insertions in the host genome1–3,6. Although the reverse transcriptase that they encode can synthesize the first-strand DNA1–3,6, how the second-strand DNA is generated remains largely unclear. Here we report that retrotransposons hijack the alternative end-joining (alt-EJ) DNA repair process of the host for a circularization step to synthesize their second-strand DNA. We used Nanopore sequencing to examine the fates of replicated retrotransposon DNA, and found that 10% of them achieve new insertions, whereas 90% exist as extrachromosomal circular DNA (eccDNA). Using eccDNA production as a readout, further genetic screens identified factors from alt-EJ as essential for retrotransposon replication. alt-EJ drives the second-strand synthesis of the long terminal repeat retrotransposon DNA through a circularization process and is therefore necessary for eccDNA production and new insertions. Together, our study reveals that alt-EJ is essential in driving the propagation of parasitic genomic retroelements. Our study uncovers a conserved function of this understudied DNA repair process, and provides a new perspective to understand—and potentially control—the retrotransposon life cycle.

Suggested Citation

  • Fu Yang & Weijia Su & Oliver W. Chung & Lauren Tracy & Lu Wang & Dale A. Ramsden & ZZ Zhao Zhang, 2023. "Retrotransposons hijack alt-EJ for DNA replication and eccDNA biogenesis," Nature, Nature, vol. 620(7972), pages 218-225, August.
  • Handle: RePEc:nat:nature:v:620:y:2023:i:7972:d:10.1038_s41586-023-06327-7
    DOI: 10.1038/s41586-023-06327-7
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    Cited by:

    1. Jinxin Phaedo Chen & Constantin Diekmann & Honggui Wu & Chong Chen & Giulia Chiara & Enrico Berrino & Konstantinos L. Georgiadis & Britta A. M. Bouwman & Mohit Virdi & Luuk Harbers & Sara Erika Bellom, 2024. "scCircle-seq unveils the diversity and complexity of extrachromosomal circular DNAs in single cells," Nature Communications, Nature, vol. 15(1), pages 1-14, December.
    2. Jundong Zhuang & Yaoxin Zhang & Congcong Zhou & Danlin Fan & Tao Huang & Qi Feng & Yiqi Lu & Yan Zhao & Qiang Zhao & Bin Han & Tingting Lu, 2024. "Dynamics of extrachromosomal circular DNA in rice," Nature Communications, Nature, vol. 15(1), pages 1-14, December.
    3. Xuyuan Gao & Ke Liu & Songwen Luo & Meifang Tang & Nianping Liu & Chen Jiang & Jingwen Fang & Shouzhen Li & Yanbing Hou & Chuang Guo & Kun Qu, 2024. "Comparative analysis of methodologies for detecting extrachromosomal circular DNA," Nature Communications, Nature, vol. 15(1), pages 1-14, December.
    4. Panpan Zhang & Assane Mbodj & Abirami Soundiramourtty & Christel Llauro & Alain Ghesquière & Mathieu Ingouff & R. Keith Slotkin & Frédéric Pontvianne & Marco Catoni & Marie Mirouze, 2023. "Extrachromosomal circular DNA and structural variants highlight genome instability in Arabidopsis epigenetic mutants," Nature Communications, Nature, vol. 14(1), pages 1-11, December.

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