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Updated: May 16, 2026
High-resolution Imaging and Analysis of Individual Astral Microtubule Dynamics in Budding Yeast
Published on: April 20, 2017
Defective spatial control in patterning of microtubular structures in mutants of the ciliate Paraurostyla: II.
1Department of Cell Biology, M. Nencki Institute of Experimental Biology, Warsaw, Poland; Zoological Institute of Westfalian University, Münster, FRG.
Abstract:
The abnormal ciliary pattern and its propagation was studied in the double recessive mutant 95 (mlm/mlm, pl/pl) in Paraurostyla weissei. In line 95, widening and concomitant overlapping of three organelle domains occurs at the right ventro-lateral part of the cell, in addition to the multi-left-marginal syndrome involving broadening of three organellar domains in the left ventro-lateral part of the cell (Dubielecka and Jerka-Dziadosz 1989). The modifications in positioning of ciliary primordia pervade both left and right parts of the cell, suggesting that the cell's ability to maintain discrete boundary conditions is affected. The way in which particular primordia of ciliature develop is consistent with an intercalation-overlapping model that postulates a cyclic instability of the system of positional information caused by a change in distribution of the ventral positional values and intercalation of intermediate values at the lateral parts of the cell. The developmental phenotype is a result of the ability of the morphogenetic machinery of the cell to record different phases of the postulated positional cycle.
Insights
Abnormal ciliary patterns in Paraurostyla weissei mutants reveal disruptions in cellular organization. This suggests a cyclic instability in positional information during development, impacting ciliary primordia development.
Area of Science:
- Cell Biology
- Developmental Biology
- Protozoology
Background:
- The single-celled ciliate Paraurostyla weissei exhibits complex ciliary patterns crucial for its structure and function.
- Mutations can disrupt the precise organization of ciliary primordia, leading to abnormal cellular phenotypes.
- Previous studies identified specific mutations affecting ciliary development in P. weissei.
Purpose of the Study:
- To investigate the abnormal ciliary pattern and its propagation in the double recessive mutant 95 (mlm/mlm, pl/pl) of Paraurostyla weissei.
- To elucidate the underlying mechanisms of ciliary pattern abnormalities and their developmental consequences.
- To test the validity of the intercalation-overlapping model in explaining positional information dynamics.
Main Methods:
- Phenotypic analysis of the double recessive mutant 95 (mlm/mlm, pl/pl) in Paraurostyla weissei.
- Detailed observation and documentation of ciliary primordia positioning and development.
- Comparison of observed patterns with predictions from the intercalation-overlapping model.
Main Results:
- Mutant 95 exhibits abnormal widening and overlapping of organelle domains in both right ventro-lateral and left ventro-lateral regions.
- Ciliary primordia positioning modifications affect both left and right sides of the cell, indicating compromised boundary condition maintenance.
- The observed developmental phenotype aligns with an intercalation-overlapping model involving cyclic instability of positional information.
Conclusions:
- The study demonstrates that mutations can severely disrupt the spatial organization of ciliary primordia in P. weissei.
- The findings support a model of cyclic instability in positional information, where changes in ventral positional values drive developmental abnormalities.
- The morphogenetic machinery of the cell appears capable of recording different phases of this postulated positional cycle, leading to the observed phenotypes.
