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Updated: Jul 24, 2025
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Reconstitution of Basic Mitotic Spindles in Spherical Emulsion Droplets
Published on: August 13, 2016
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miR-31-mediated local translation at the mitotic spindle is important for early development
Carolyn M Remsburg1, Kalin Konrad1,2, Nadezda Stepicheva1,3
1Department of Biological Sciences, University of Delaware, Newark, DE 19716.
Research Square
|July 3, 2023
Summary
MicroRNA 31 (miR-31) is crucial for cell division, regulating local translation at the mitotic spindle. Inhibiting miR-31 causes developmental and chromosomal defects, highlighting its conserved role in mitosis.
Area of Science:
- Molecular Biology
- Developmental Biology
- Cell Biology
Background:
- MicroRNAs (miRNAs) are key regulators of gene expression, influencing critical cellular processes.
- The specific role of miR-31 in the intricate mechanisms of cell division, particularly at the mitotic spindle, remains incompletely understood.
Approach:
- Investigated the localization and function of miR-31 and its targets within the mitotic spindle of sea urchin embryos and mammalian cells.
- Utilized inhibition studies to observe the effects of reduced miR-31 activity on cellular development and chromosomal integrity.
- Identified direct miR-31 targets involved in actin remodeling, including beta-actin, Gelsolin, Rab35, and Fascin.
Key Points:
- miR-31 and its targets are localized to the mitotic spindle during cell division.
- Inhibition of miR-31 in sea urchin embryos resulted in developmental delays and increased cytoskeletal and chromosomal abnormalities.
- miR-31 directly suppresses actin remodeling transcripts, and its inhibition leads to increased Fascin translation at the spindle.
Conclusions:
- miR-31 regulates local translation at the mitotic spindle, essential for accurate cell division.
- This post-transcriptional regulation by miR-31 at the mitotic spindle represents a potentially conserved mechanism for controlling mitosis.
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