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Mutations in the Drosophila rough deal gene affecting RZZ kinetochore function
Alexandra Menant1, Roger E Karess1
1Université de Paris, CNRS, Institut Jacques Monod, 15 rue Hélène Brion, Paris, 75013, France.
Biology of the Cell
|July 1, 2020
Summary
The Rod_C domain of the RZZ complex is crucial for its kinetochore recruitment and function during the spindle assembly checkpoint. Mutations reveal its role in dynein activity and proper chromosome segregation.
Area of Science:
- Cell Biology
- Molecular Biology
- Genetics
Background:
- The RZZ complex (Rough-Deal, Zw10, Zwilch) is vital for the spindle assembly checkpoint (SAC), ensuring correct chromosome segregation during mitosis.
- RZZ facilitates the recruitment of Mad1-Mad2 and dynein to unattached kinetochores, acting as a key component of the outer kinetochore and fibrous corona.
Purpose of the Study:
- To investigate the functional significance of the C-terminal domain (Rod_C) of the Rod subunit within the RZZ complex.
- To elucidate the role of the Rod_C domain in RZZ complex assembly, kinetochore recruitment, and SAC regulation.
Main Methods:
- Generated point mutations within the Rod_C domain of the RZZ complex in Drosophila.
- Analyzed the phenotypic consequences of these mutations on RZZ localization, complex formation, and kinetochore-associated dynein activity.
Main Results:
- Several Rod_C mutations disrupted RZZ recruitment to kinetochores, with one mutation exhibiting temperature sensitivity.
- Mutations affected dynein activity and recruitment at the kinetochore, despite the RZZ complex maintaining its assembly with Zw10 and Zwilch.
- The Rod_C domain was found to be essential for proper RZZ function at kinetochores.
Conclusions:
- The Rod_C domain is critical for mediating protein interactions required for RZZ recruitment and its overall functionality at kinetochores.
- These findings provide new insights into the molecular mechanisms governing the spindle assembly checkpoint and chromosome segregation.
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