Cited by 198Autophagy in Disease and TherapyMicrotubule and mitosis dynamicsUbiquitin and proteasome pathways

Autophagic removal of micronuclei

Open access
Rello-Varona, Santiago, Lissa, Delphine, Shen, Shensi, Niso-Santano, Mireia, Senovilla, Laura, Mariño, Guillermo, Vitale, Ilio, Jemaá, Mohamed +4 more·2012·Cell Cycle

Abstract

Macroautophagy is known to participate in the quality control and turnover of cytoplasmic organelles, yet there is little evidence that macroautophagy targets nuclei in mammalian cells. Here, we investigated whether autophagy may target micronuclei, which arise as a result of deficient bipolar chromosome segregation in cells exposed to cell cycle perturbations. After removal of several distinct cell cycle blockers (nocodazole, cytochalasin D, hydroxyurea or SP600125), cells manifested an increase in the frequency of micronuclei (positive for histone H2B-RFP) as well as an increase in autophagic puncta (positive for GFP-LC3) over several days. A small but significant percentage of micronuclei co-localized with GFP-LC3 in autophagy-competent cells and this co-localization was lost after knockdown of ATG5 or ATG7. Electron microscopy analyses confirmed autophagic sequestration of micronuclei. "Autophagic micronuclei" (GFP-LC3⁺) were also decorated with p62/SQSTM1, while non-autophagic (GFP-LC3⁻) micronuclei where p62/SQSTM1 negative. In addition, GFP-LC3⁺ micronuclei exhibited signs of envelope degradation and γH2AX⁺ DNA damage foci, yet stained less intensively for chromatin markers, whereas GFP-LC3⁻ micronuclei were surrounded by an intact envelope and rarely exhibited markers or DNA damage. These results indicate that micronuclei can be subjected to autophagic degradation. Moreover, it can be speculated that removal of micronuclei may contribute to the genome-stabilizing effects of autophagy.

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  • Degradation by autophagy has been proposed for CCF and MN.

    “Degradation by autophagy has also been proposed for CCF and MN (Dou et al., 2015; Rello-Varona et al., 2012; Sagona et al., 2014).”

    From Cytoplasmic DNA: sources, sensing, and role in aging and disease (2021) · cites this paper as Rello-Varona et al., 2012

  • Autophagy destroys micronuclei arising from aberrant mitoses that perturb cell division and give rise to tetraploid cancer cell precursors.

    “Autophagy destroys micronuclei that arise from aberrant mitoses and then perturb cell division, giving rise to tetraploid cancer cell precursors.154”

    From Meta-hallmarks of aging and cancer (2023) · cites this paper as [154]

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Research works printed but not linked: 2

  1. Park YE, Hayashi YK, Bonne G, Arimura T, Noguchi S, Nonaka I, et al. Autophagic degradation of nuclear components in mammalian cells. Autophagy 2009; 5:795-804; PMID:19550147.
  2. Klionsky DJ, Abeliovich H, Agostinis P, Agrawal DK, Aliev G, Askew DS, et al. Guidelines for the use and interpretation of assays for monitoring autophagy in higher eukaryotes. Autophagy 2008; 4:151-75; PMID:18188003.

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Authors
Rello-Varona, S., Lissa, D., Shen, S., Niso-Santano, M., Senovilla, L., Mariño, G., Vitale, I., Jemaá, M., Harper, F., Pierron, G., Castedo, M., & Kroemer, G.
Affiliations
  • INSERM, U848; Institut Gustave Roussy; Université Paris Sud; Villejuif, France
  • Université Paris-Sud (FR)
  • Inserm (FR)
Venue
Cell Cycle
Published
2012-01-01
Volume
11
Issue
1
Pages
170-176
ISSN
  • 1538-4101 (ISSN-L)
  • 1551-4005
OpenAlex
W2008685892
Cited by
198
References
0
Citations by year
2026: 12 · 2025: 9 · 2024: 10 · 2023: 17 · 2022: 12 · 2021: 30 · 2020: 20 · 2019: 12 · 2018: 11 · 2017: 13 · 2016: 20 · 2015: 12 · 2014: 12 · 2013: 4 · 2012: 4
FWCI
7.63
Type
journal article
Language
en
Open access
Locations
  • Cell Cycle (publishedVersion)
  • PubMed (publishedVersion)
  • Consultation of the Doctoral Thesis Database (TESEO) (Ministerio de Educación, Cultura y Deporte) (submittedVersion, cc-by-nc-nd)
Funders
  • European Commission
  • Agence Nationale de la Recherche
  • Fondation pour la Recherche Médicale
  • Institut National Du Cancer
Topics
  • Health Sciences › Medicine › Epidemiology › Autophagy in Disease and Therapy
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Cell Biology › Microtubule and mitosis dynamics
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Ubiquitin and proteasome pathways
Keywords
autophagy, micronuclei, macroautophagy, ATG5, ATG7, p62, LC3, chromosome segregation errors, cell cycle inhibitors, DNA damage, genome stability
MeSH terms
Autophagy-Related Protein 5, Autophagy-Related Protein 7, Autophagy, Cell Nucleus, DNA Damage, Histones, Humans, Microtubule-Associated Proteins, Nuclear Envelope, Recombinant Fusion Proteins, RNA Interference, RNA, Small Interfering, Ubiquitin-Activating Enzymes, Cell Line, Tumor, Micronuclei, Chromosome-Defective

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