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Updated: Aug 15, 2026
Live Imaging of Mitosis in the Developing Mouse Embryonic Cortex
Published on: June 4, 2014
[Changes in the distribution of mitochondria in mouse embryos blocked at the two-cell stage]
Abstract:
Changes in the distribution of mitochondria in the two-cell mouse embryos preceding the developmental arrest in vitro, caused by a genetically determined "two-cell block in vitro" or genisteine treatment, were examined vitally using the mitochondrial-specific probe rhodamine 123 and conventional fluorescence microscopy. In the former case, serious disturbances in the localization of mitochondria appeared already from the middle of two-cell stage, long before the time corresponding to the 2nd cleavage division. Comparison of the behavior of mitochondria in the embryos successfully developing between the one- and two-cell stages and that in the embryos that ceased to cleave suggests that the developmental arrest was accompanied by aggregation of the mitochondria into clusters. There are many such clusters unlike in the cytoplasm of normally developing embryos. Intracellular localization of clusters observed in the genisteine-treated embryos differed radically from that observed in the embryos blocked in vitro at the two-cell stage.
Insights
Mitochondrial distribution changes precede developmental arrest in mouse embryos. Aggregation into clusters indicates a block in early development, differing between genetic causes and genisteine treatment.
Area of Science:
- Developmental Biology
- Cell Biology
- Mitochondrial Dynamics
Context:
- The
- Early embryonic development in mice is crucial for understanding reproductive biology and potential developmental disorders.
Purpose:
- To investigate the role of mitochondrial distribution in early mouse embryo developmental arrest.
- To differentiate the effects of genetic factors versus chemical treatments on mitochondrial localization during embryonic development.
Summary:
- Mitochondrial distribution was vital-stained with rhodamine 123 in two-cell mouse embryos experiencing developmental arrest.
- Significant mitochondrial mislocalization was observed prior to the second cleavage division in genetically blocked embryos.
- Embryonic arrest was associated with mitochondrial aggregation into clusters, with distinct localization patterns between genetically blocked and genisteine-treated embryos.
Impact:
- Provides insights into the cellular mechanisms underlying early embryonic developmental failure.
- Highlights the importance of mitochondrial organization for successful embryonic progression.
- Suggests potential targets for interventions aimed at preventing developmental arrest in assisted reproductive technologies.
