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Maternal factors controlling blastomere fragmentation in early mouse embryos
Zhiming Han1, Young Gie Chung, Shaorong Gao
1The Fels Institute for Cancer Research and Molecular Biology, Temple University School of Medicine, Philadelphia, PA 19140, USA.
Biology of Reproduction
|November 13, 2004
Summary
The maternal genome, specifically the maternal pronucleus, significantly influences early embryo development and cytofragmentation. This finding highlights the earliest known embryonic genome effect on mammalian embryo phenotype.
Area of Science:
- Developmental Biology
- Epigenetics
- Mammalian Embryogenesis
Background:
- Sperm-egg interactions are crucial for embryo viability and integrity.
- Genomic imprinting and differential transcription support early embryogenesis.
- Previous work indicated genotype combinations affect embryo cytofragmentation.
Purpose of the Study:
- To investigate the cellular basis of the maternal genotype effect on embryo cytofragmentation.
- To determine the relative contributions of the maternal pronucleus and ooplasm to this effect.
Main Methods:
- Maternal pronuclear transfer in mouse embryos.
- Assessment of cytofragmentation.
- Sensitivity analysis using alpha-amanitin treatment.
Main Results:
- The maternal genotype effect on cytofragmentation is primarily controlled by the maternal pronucleus.
- The ooplasm plays a secondary role in this maternal genotype effect.
- The maternal pronucleus's influence is sensitive to alpha-amanitin, suggesting transcriptional involvement.
Conclusions:
- The maternal genome's effect on cytofragmentation is the earliest observed embryonic genome influence on mammalian embryo phenotype.
- Clinical approaches to oocyte quality assessment in humans should consider early embryonic genome effects, particularly from the maternal genome.