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Temperature-sensitive mutations affecting flagellar assembly and function in Chlamydomonas reinhardtii

B Huang, M R Rifkin, D J Luck

    The Journal of Cell Biology
    |January 1, 1977
    PubMed
    Summary

    Researchers isolated 21 temperature-sensitive mutants in Chlamydomonas reinhardtii, revealing genetic control over flagellar assembly and function. These "drop-down" mutants offer insights into the complex process of eukaryotic flagella development.

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    Area of Science:

    • Cell Biology
    • Genetics
    • Biochemistry

    Background:

    • The biflagellate alga Chlamydomonas reinhardtii is a model organism for studying flagellar assembly and function.
    • Understanding the genetic basis of flagellar morphogenesis is crucial for comprehending eukaryotic organelle development.

    Purpose of the Study:

    • To isolate and characterize temperature-sensitive mutants with defects in flagellar assembly and function in Chlamydomonas reinhardtii.
    • To genetically dissect the complex process of flagellar morphogenesis through the analysis of these mutants.

    Main Methods:

    • Isolation of conditional, temperature-sensitive mutants.
    • Phenotypic characterization of mutants at permissive (20°C) and restrictive (32°C) temperatures.
    • Genetic analysis including tetrad analysis, recombination analysis, and complementation tests.

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    Main Results:

    • 21 "drop-down" (dd) mutants were isolated, exhibiting defects in flagellar assembly, stability, motility, or viability upon temperature shift.
    • Mutants were categorized into four phenotypic groups: assembly, fragile flagella, motility, and lethal.
    • Genetic analysis indicated that the 21 mutants represent at least 14 distinct nuclear genetic loci.

    Conclusions:

    • Temperature-sensitive mutations provide a powerful tool for dissecting the genetic control of flagellar assembly and function.
    • The study demonstrates that flagellar morphogenesis in Chlamydomonas reinhardtii is amenable to genetic dissection.
    • These mutants serve as valuable resources for future research into the molecular mechanisms underlying flagellar development and function.