Role of cell shape in determination of the division plane in Schizosaccharomyces pombe: Random orientation of septa in spherical cells

M. Sipiczki, M. Yamaguchi, A. Grallert, K. Takeo, E. Zilahi, A. Bozsik, I. Miklos

Research output: Contribution to journalArticle

17 Citations (Scopus)

Abstract

The establishment of growth polarity in Schizosaccharomyces pombe cells is a combined function of the cytoplasmic cytoskeleton and the shape of the cell wall inherited from the mother cell. The septum that divides the cylindrical cell into two siblings is formed midway between the growing poles and perpendicularly to the axis that connects them. Since the daughter cells also extend at their ends and form their septa at right angles to the longitudinal axis, their septal (division) planes lie parallel to those of the mother cell. To gain a better understanding of how this regularity is ensured, we investigated septation in spherical cells that do not inherit morphologically predetermined cell ends to establish poles for growth. We studied four mutants (defining four novel genes), over 95% of whose cells displayed a completely spherical morphology and a deficiency in mating and showed a random distribution of cytoplasmic microtubules, Tea1p, and F-actin, indicating that the cytoplasmic cytoskeleton was poorly polarized or apolar. Septum positioning was examined by visualizing septa and division scars by calcofluor staining and by the analysis of electron microscopic images. Freeze-substitution, freeze-etching, and scanning electron microscopy were used. We found that the elongated bipolar shape is not essential for the determination of a division plane that can separate the postmitotic nuclei. However, it seems to be necessary for the maintenance of the parallel orientation of septa over the generations. In the spherical cells, the division scars and septa usually lie at angles to each other on the cell surface. We hypothesize that the shape of the cell indirectly affects the positioning of the septum by directing the extension of the spindle.

Original languageEnglish
Pages (from-to)1693-1701
Number of pages9
JournalJournal of bacteriology
Volume182
Issue number6
DOIs
Publication statusPublished - Mar 2000

ASJC Scopus subject areas

  • Microbiology
  • Molecular Biology

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