eCite Digital Repository

Cytoskeletal dynamics of Apedinella radians (Pedinellophyceae): II. Cell division and the maintenance of cell polarity and symmetry


Koutoulis, A and Wetherbee, R, Cytoskeletal dynamics of Apedinella radians (Pedinellophyceae): II. Cell division and the maintenance of cell polarity and symmetry, Protoplasma: An International Journal of Cell Biology, 175, (1-2) pp. 29-42. ISSN 0033-183X (1993) [Refereed Article]

Restricted - Request a copy

Copyright Statement

The final publication is available at

Official URL:

DOI: doi:10.1007/BF01403282


The dynamics of the cytoskeletal proteins centrin, actin, and tubulin were followed during cell division in the unicellular phytoflagellate Apedinella radians (Pedinellophyceae). Three centrin, or centrin-like, components appear to coordinate independent developmental events during cell division. The first component, basal body centrin, maintains a physical link between basal bodies and the anterior nuclear membrane. Basal body centrin divides in two at metaphase, and each portion segregates with two basal bodies at anaphase. As the positioning of basal bodies defines the anterior region of the cell, basal body centrin appears to play a role in maintaining cell polarity throughout the cell cycle. The second centrin component consists of an array of filamentous bundles arranged as a six-pointed star. During cell division, the star undergoes a conformational change resulting in two distinct centrin triangles, one distributed to each daughter cell, suggesting that centrin filamentous bundles are involved in maintaining cell (radial) symmetry. The third centrin component is transient and associates with the spindle poles, emerging prior to mitosis and remaining until late anaphase/early telophase. Spindle pole centrin establishes temporary horizontal bipolarity, thereby establishing the spindle axis. Unlike centrin filamentous bundles, actin filamentous bundles depolymerize prior to mitosis, indicating they do not influence cell symmetry during cell division. Mitosis is described for the first time in a pedinellid and features a closed spindle, the absence of rhizoplasts and a persistent spindle.

Item Details

Item Type:Refereed Article
Research Division:Biological Sciences
Research Group:Plant biology
Research Field:Phycology (incl. marine grasses)
Objective Division:Expanding Knowledge
Objective Group:Expanding knowledge
Objective Field:Expanding knowledge in the biological sciences
UTAS Author:Koutoulis, A (Professor Anthony Koutoulis)
ID Code:70908
Year Published:1993
Web of Science® Times Cited:7
Deposited By:Research Division
Deposited On:2011-07-05
Last Modified:2011-07-06

Repository Staff Only: item control page