Abstract
To maintain size homeostasis in a unicellular culture, cells should coordinate growth to the division cycle. This is achieved via size control mechanisms (also known as size checkpoints), i.e. some events during the mitotic cycle supervene only if the cell has reached a critical size. Rod-shaped cells like those of fission yeast are ideal model organisms to study these checkpoints via time-lapse microphotography. By applying this method, once we can analyse the growth process between two consecutive divisions at a single (or even at an ‘average’) cellular level, moreover, we can also position the size checkpoint(s) at the population level. Finally, any of these controls can be abolished in appropriate cell cycle mutants, either in steady-state or in induction synchronised cultures. In the latter case, we produce abnormally oversized cells, and microscopic experiments with them clearly show the existence of a critical size above which the size checkpoint ceases (becomes cryptic). In this review, we delineate the development of our knowledge both on the growth mode of fission yeast and on the operating size control(s) during its mitotic cycle. We finish these historical stories with our recent findings, arguing that three different size checkpoints exist in the fission yeast cell cycle, namely in late G1, in mid G2 and in late G2, which has been concluded by analysing these controls in several cell cycle mutants.
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Acknowledgments
We are grateful to the late Murdoch Mitchison (1922–2011), who provided us with his time-lapse microscopic films. We also thank Anna Rácz-Mónus and Eszter Vörös for their contributions in cell length measurements. Research in our laboratory is supported by the Hungarian Scientific Research Fund (OTKA K-76229).
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Communicated by M. Kupiec.
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Sveiczer, Á., Horváth, A. How do fission yeast cells grow and connect growth to the mitotic cycle?. Curr Genet 63, 165–173 (2017). https://doi.org/10.1007/s00294-016-0632-0
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DOI: https://doi.org/10.1007/s00294-016-0632-0