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Research Article

Micrasterias cells as a model system for research on morphogenesis.

U Meindl
U Meindl
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SUMMARY

Micrasterias species have been the subject of numerous experimental studies on cell shape formation in the last 40 years. Chemical and physical treatment during different developmental stages, as well as investigations of ultrastructure by means of various different preparation methods, have yielded information about some principles of morphogenesis in the symmetric, highly ornamented Micrasterias cell. The basic symmetry of a Micrasterias cell is determined prior to mitosis and is established without nuclear control thereafter. Normal cell development, however, may occur only under the conditions of continuous protein synthesis throughout the cell cycle. A prepattern for the later cell shape seems to be present at the plasma membrane at the early stages of septum formation. It is realized by a local, patterned distributed incorporation of cell wall material that is delivered by Golgi-produced vesicles. The areas where fusions take place between the primary wall material containing vesicles and the plasma membrane are defined by inward ionic currents that are carried at least in part by calcium. These areas develop into lobes during the following course of cell growth. Cell shaping in Micrasterias cells is thus mediated by both an enhanced extension of the cell wall and an additional incorporation of wall material in the areas of the lobes. Numerous studies have indicated that actin plays an important role in morphogenesis, whereas microtubules do not participate in this process but are involved mainly in nuclear migration. The present review shows that although a wealth of details concerning Micrasterias morphogenesis has already been elucidated, two main questions, i.e., the method of septum formation and the splitting of the lobes, remain to be answered.

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Micrasterias cells as a model system for research on morphogenesis.
U Meindl
Microbiology and Molecular Biology Reviews Jun 1993, 57 (2) 415-433; DOI:

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Micrasterias cells as a model system for research on morphogenesis.
U Meindl
Microbiology and Molecular Biology Reviews Jun 1993, 57 (2) 415-433; DOI:
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