C. elegans XMAP215/ZYG-9 and TACC/TAC-1 act at multiple times during oocyte meiotic spindle assembly and promote both spindle pole coalescence and stability
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View abstract on PubMed
Summary
This summary is machine-generated.The ZYG-9/TAC-1 complex is crucial for microtubule stability and spindle assembly during C. elegans oocyte meiosis. This study reveals distinct roles for ZYG-9/TAC-1 throughout meiosis I and II, impacting spindle pole formation and bipolarity.
Area Of Science
- Cell Biology
- Developmental Biology
- Genetics
Background
- Microtubule stability is essential for accurate chromosome segregation during meiosis.
- The XMAP215/TACC complex is a conserved regulator of microtubule dynamics.
- Acentrosomal spindle assembly in oocytes relies on specific protein complexes.
Purpose Of The Study
- To investigate the temporal requirements of the ZYG-9/TAC-1 complex during oocyte meiotic cell division.
- To determine if ZYG-9/TAC-1 functions are temporally distinct or have indirect consequences.
- To dissect the roles of ZYG-9/TAC-1 in spindle assembly with high temporal resolution.
Main Methods
- Utilized live cell imaging in C. elegans.
- Employed fast-acting temperature-sensitive alleles of zyg-9 and tac-1.
- Performed temperature upshift and downshift experiments to analyze temporal requirements.
Main Results
- ZYG-9/TAC-1 promotes pole focus coalescence and stabilizes them during prometaphase.
- The complex maintains spindle bipolarity by suppressing ectopic pole formation during metaphase.
- ZYG-9/TAC-1 is independently required for spindle assembly during meiosis II.
Conclusions
- The ZYG-9/TAC-1 complex has multiple, temporally separable roles throughout oocyte meiosis.
- Spindle pole stability regulated by ZYG-9/TAC-1 is critical for chromosome congression.
- Negative regulation of microtubule stability by ZYG-9/TAC-1 may explain observed spindle defects.
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