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Application of Laser Micro-irradiation for Examination of Single and Double Strand Break Repair in Mammalian Cells

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Export or explode: Export defects cause micronucleus membrane rupture.

Hiba Baaziz¹, Daniela Cimini¹

¹Department of Biological Sciences and Fralin Life Sciences Institute, Virginia Tech, Blacksburg, VA, USA.

The Journal of Cell Biology

|March 24, 2026

Summary

This summary is machine-generated.

Micronucleus membrane rupture causes genome instability. Researchers found that reduced levels of the transport protein RCC1 impair protein export, leading to micronucleus expansion and rupture.

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An Automated Method to Perform The In Vitro Micronucleus Assay using Multispectral Imaging Flow Cytometry

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Published on: May 13, 2019

Area of Science:

Cell Biology
Genetics
Molecular Biology

Background:

Micronucleus membrane rupture is a known driver of genome instability.
The precise mechanisms causing micronucleus rupture remain largely unknown.
Understanding these mechanisms is crucial for comprehending genome instability.

Purpose of the Study:

To elucidate the molecular mechanisms underlying micronucleus membrane rupture.
To identify key factors involved in the expansion and rupture of micronuclei.
To connect protein export pathways to genome instability.

Main Methods:

Investigated the role of the transport protein RCC1 in micronucleus formation and integrity.
Analyzed the impact of reduced RCC1 levels on protein export.
Observed micronucleus expansion and nuclear envelope rupture in response to impaired protein export.

Main Results:

Impaired protein export, specifically due to reduced levels of RCC1, was identified as a key driver.
Reduced RCC1 levels lead to micronucleus expansion.
This expansion ultimately results in nuclear envelope rupture and genome instability.

Conclusions:

Reduced levels of the transport protein RCC1 impair protein export, causing micronucleus expansion.
Micronucleus expansion driven by impaired protein export leads to nuclear envelope rupture.
This study reveals a novel mechanism linking protein transport defects to genome instability.