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Bub3 gene disruption in mice reveals essential mitotic spindle checkpoint function during early embryogenesis
P Kalitsis1, E Earle, K J Fowler
1Murdoch Children's Research Institute, Royal Children's Hospital, Flemington Road, Parkville 3052, Melbourne, Australia.
Genes & Development
|September 20, 2000
Summary
Bub3 protein is crucial for early embryonic development in mice. Gene disruption leads to severe mitotic errors and embryonic lethality, confirming Bub3's role in the spindle checkpoint.
Area of Science:
- Cell Biology
- Developmental Biology
- Genetics
Background:
- Bub3 is a conserved protein integral to the mitotic spindle assembly complex.
- The spindle assembly checkpoint (SAC) ensures accurate chromosome segregation during cell division.
Purpose of the Study:
- To investigate the essential role of Bub3 during early mouse embryogenesis.
- To elucidate the function of Bub3 within the spindle checkpoint pathway in vivo.
Main Methods:
- Generation and analysis of Bub3 gene-disrupted (null) mouse embryos.
- Microscopic examination of embryonic development and mitotic progression.
- Treatment of null embryos with spindle-depolymerizing agents.
Main Results:
- Bub3 null embryos survive until 6.5-7.5 days postcoitus, exhibiting normal morphology initially.
- Mitotic errors, including micronuclei and chromatin bridging, increase significantly from 4.5 days postcoitus.
- Null embryos fail to arrest in metaphase when treated with spindle inhibitors, showing increased mitotic disarray.
Conclusions:
- Bub3 is essential for maintaining genomic stability during early embryogenesis.
- The study confirms Bub3's critical role as a component of the spindle checkpoint pathway.
- Bub3 deficiency leads to developmental failure due to unresolved mitotic errors.