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Updated: Jun 5, 2025
07:14
Live Cell Imaging to Assess the Dynamics of Metaphase Timing and Cell Fate Following Mitotic Spindle Perturbations
Published on: September 20, 2019
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Lgl resets Par complex membrane loading at mitotic exit to enable asymmetric neural stem cell division
Bryce LaFoya1, Sarah E Welch1, Kenneth E Prehoda1
1Institute of Molecular Biology, Department of Chemistry and Biochemistry, 1229 University of Oregon, Eugene, OR 97403.
Biorxiv : the Preprint Server for Biology
|December 16, 2024
Summary
Lethal giant larvae (Lgl) resets cell polarity in Drosophila neural stem cells by removing the Par complex after mitosis. This ensures proper asymmetric cell division in the next cycle.
Area of Science:
- Cell Biology
- Developmental Biology
- Neuroscience
Background:
- The Par complex is crucial for cell polarity in various animal cells.
- Mechanisms restricting Par complex localization to specific membrane domains are not fully understood.
- Lethal giant larvae (Lgl) is a tumor suppressor involved in cell polarity regulation.
Purpose of the Study:
- To investigate the role of Lgl in polarizing the Par complex in Drosophila neural stem cells (NSCs).
- To elucidate the mechanism by which Lgl regulates Par complex localization during the cell cycle.
Main Methods:
- Utilized Drosophila melanogaster as a model organism.
- Observed Lgl and Par complex localization in neural stem cells (NSCs).
- Analyzed the impact of Lgl function on Par complex dynamics and cell division.
Main Results:
- In contrast to epithelial cells, Lgl is cytoplasmic when the Par complex is apically polarized in NSCs.
- Lgl's primary role is to remove the Par complex from the membrane post-mitosis, acting as a 'polarity reset'.
- Failure of Lgl-mediated reset leads to persistent basal membrane Par complex, disrupting fate determinant polarization and asymmetric cell division.
Conclusions:
- Lgl mediates a novel mechanism for regulating cell polarity by resetting the Par complex localization.
- The prepolarized state, established by Lgl, is essential for sustained Par-mediated polarity.
- Understanding this Lgl-dependent polarity reset is key for proper asymmetric cell division in neural stem cells.
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