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Testing the time-of-flight model for flagellar length sensing.
Hiroaki Ishikawa1, Wallace F Marshall2
1Department of Biochemistry and Biophysics, University of California, San Francisco, San Francisco, CA 94143.
Molecular Biology of the Cell
|September 22, 2017
Summary
Cells regulate flagellar length using intraflagellar transport (IFT). This study tested the "time-of-flight" model for flagellar length control in Chlamydomonas, finding it does not explain the observed IFT regulation.
Area of Science:
- Cell Biology
- Molecular Biology
- Biophysics
Background:
- Cilia and flagella are vital microtubule-based cell appendages involved in signaling and fluid movement.
- Intraflagellar transport (IFT) maintains flagellar length through active transport.
- A negative correlation exists between IFT levels and flagellar length, suggesting feedback regulation.
Purpose of the Study:
- To investigate the mechanism of length-dependent feedback controlling intraflagellar transport (IFT).
- To test the validity of the
- time-of-flight
- model for flagellar length regulation.
Main Methods:
- Utilized Chlamydomonas dynein mutant cells with impaired retrograde transport.
- Compared the amount of IFT injection in mutant versus control cells.
- Analyzed flagellar length regulation mechanisms.
Main Results:
- Dynein mutant cells exhibited increased IFT injection compared to controls.
- This finding contradicts the predictions of the "
- time-of-flight
- " model.
Conclusions:
- The
- time-of-flight
- " model is insufficient to explain flagellar length control in Chlamydomonas.
- Chlamydomonas likely employs an alternative feedback system for regulating flagellar length and IFT.