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Cell Cycle Analysis in the C. elegans Germline with the Thymidine Analog EdU

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Cell cycle in ascidian eggs and embryos.

Alex McDougall¹, Janet Chenevert, Karen W Lee

¹Developmental Biology Unit UMR 7009, UMPC Univ. Paris 06 and Center National de la Recherche (CNRS), Observatoire Océanologique, 06230 Villefranche-sur-Mer, France. alex.mc-dougall@obs-vlfr.fr

Results and Problems in Cell Differentiation

|June 2, 2011

Summary

Ascidian eggs use a conserved cytostatic factor (CSF) for cell cycle arrest, but uniquely lack Erp1, a key vertebrate protein. Fertilization triggers calcium oscillations that drive meiotic exit and asymmetric cell division in embryos.

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Area of Science:

Developmental Biology
Cell Biology
Molecular Biology

Background:

Ascidian oocytes and embryos are model systems for studying cell cycle control and asymmetric cell division (ACD).
Cell cycle arrest in mature oocytes is primarily mediated by cytostatic factor (CSF).
Vertebrate CSF involves the Mos/MEK/MAPK/Erp1 pathway, inhibiting APC/C(cdc20) and stabilizing cyclin B.

Purpose of the Study:

To overview specific and exceptional aspects of cell cycle control in ascidian oocytes and early embryos.
To highlight conserved and divergent mechanisms of CSF and meiotic exit.
To describe the role of the centrosome-attracting body (CAB) in embryonic asymmetric cell division.

Main Methods:

Comparative analysis of cell cycle control mechanisms between ascidians and vertebrates.
Review of existing literature on ascidian oocyte maturation and embryonic development.
Focus on molecular pathways including Mos/MEK/MAPK, APC/C(cdc20), and calcium signaling.

Main Results:

Ascidian oocytes arrest at metaphase I via CSF, mediated by Mos/MAPK, despite lacking Erp1.
Fertilization triggers calcium oscillations that promote cyclin B destruction and meiotic exit, independent of Erp1.
Embryonic cell cycles exhibit stereotyped division rates and orientations, driven by the CAB for asymmetric cell division.

Conclusions:

Ascidians present a unique model for studying cell cycle control, demonstrating conserved CSF components with invertebrate-specific adaptations.
The sperm-triggered calcium transient is crucial for meiotic exit in ascidians, operating without Erp1.
The CAB is essential for generating germline precursors through precise asymmetric cell divisions in ascidian embryos.