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Catastrophic nuclear envelope collapse in cancer cell micronuclei
Emily M Hatch1, Andrew H Fischer, Thomas J Deerinck
1Molecular and Cell Biology Laboratory, Salk Institute for Biological Studies, 10010 N. Torrey Pines Road, La Jolla, CA 92037, USA.
Cell
|July 6, 2013
Summary
Micronuclei (MN) can collapse irreversibly during interphase due to nuclear envelope (NE) defects, impairing nuclear function and causing DNA damage. This NE collapse is linked to genomic instability and may serve as a biomarker in cancer.
Area of Science:
- Cell Biology
- Cancer Research
- Genomics
Background:
- Missegegated chromosomes form micronuclei (MN) during mitotic exit.
- Micronuclei (MN) exhibit reduced function despite structural similarity to primary nuclei.
Purpose of the Study:
- To investigate the structural and functional integrity of MN during interphase.
- To identify the mechanisms underlying MN dysfunction and its potential role in cancer.
Main Methods:
- Live-cell imaging to observe MN dynamics.
- Immunofluorescence to assess nuclear envelope and lamina assembly.
- DNA damage assays to quantify genomic instability.
Main Results:
- Over 60% of MN undergo irreversible NE collapse during interphase.
- Defects in nuclear lamina assembly trigger MN disruption.
- MN disruption leads to chromatin compaction, ER tubule invasion, reduced nuclear function, and massive DNA damage.
- Disrupted MN are found in non-small-cell lung cancer, correlating with genomic instability.
Conclusions:
- NE collapse is a critical event causing MN dysfunction.
- Aberrant NE organization in MN is linked to aneuploidy and genomic instability.
- Disrupted MN represent a potential biomarker for genomic instability in solid tumors.
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