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Related Experiment Video

Updated: Jun 20, 2026

Aip1p Dynamics Are Altered by the R256H Mutation in Actin

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Published on: July 30, 2014

Decreased cofilin1 expression is important for compaction during early mouse embryo development.

Minyue Ma¹, Lin Zhou, Xuejiang Guo

¹Laboratory of Reproductive Medicine, Department of Histology and Embryology, Nanjing Medical University, Nanjing 210029, China.

Biochimica Et Biophysica Acta

|September 16, 2009

Summary

Cofilin1 down-regulation accelerates mouse embryo compaction by promoting cell flattening and polarity. Inactivation of cofilin1 is critical for establishing cellular asymmetry during early development.

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Area of Science:

Developmental Biology
Cell Biology
Molecular Biology

Background:

Early mouse development involves compaction, establishing cellular asymmetry through cell flattening and polarization.
The cytoskeletal mechanisms underlying polarized molecule and organelle distribution during compaction are not fully understood.

Purpose of the Study:

To investigate the role of cofilin1, an actin-binding protein, in mouse embryonic compaction.
To elucidate the cytoskeletal basis for cell polarity establishment during this critical developmental stage.

Main Methods:

RNA interference (siRNA) microinjection to down-regulate cofilin1 expression.
Time-lapse video microscopy for continuous observation of embryonic development.
Pronuclear microinjection of mutated cofilin1 plasmids.
Fluorescein-phalloidin staining and scanning electron microscopy.

Main Results:

Decreased cofilin1 expression accelerated compaction and promoted apical pole formation.
Microinjection of anti-cofilin1 antibody or siRNA led to earlier cell adherence.
Sustained active cofilin1 resulted in blastomeres that failed to adhere, indicating cofilin1 inactivation is crucial.
Cofilin1 knockdown embryos showed microvilli formation on blastomeres.

Conclusions:

Cofilin1 plays a significant role in regulating cortical cytoplasmic organization during mouse embryo compaction.
Cofilin1 inactivation is essential for cell flattening, adherence, and polarity establishment.
These findings highlight cofilin1's importance in the cytoskeletal dynamics governing early embryonic development.