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Temperature-sensitive mutations causing reversible paralysis in Caenorhabditis elegans.

R Hosono, S Kuno, M Midsukami

    The Journal of Experimental Zoology
    |September 1, 1985
    PubMed
    Summary

    Researchers isolated temperature-sensitive paralytic mutants in Caenorhabditis elegans. Two specific mutants, cn101 and mah-2 (cn110), exhibit distinct paralysis phenotypes and altered body forms at elevated temperatures.

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    Area of Science:

    • Genetics
    • Neurobiology
    • Developmental Biology

    Background:

    • Temperature-dependent paralytic mutants are valuable tools for studying essential gene functions in model organisms.
    • Caenorhabditis elegans is a widely used nematode model for genetic and developmental studies.

    Purpose of the Study:

    • To develop and apply a screening method for isolating temperature-dependent paralytic mutants in Caenorhabditis elegans.
    • To characterize the genetic and phenotypic properties of novel temperature-sensitive mutants.

    Main Methods:

    • A screening procedure involving short-time exposure to 30°C was employed to isolate mutants.
    • Mutant strains were analyzed for motility, body morphology, and response to acetylcholinesterase inhibitors.
    • Genetic mapping was performed for the mah-2 (cn110) mutation.

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    Main Results:

    • Ten temperature-dependent paralytic mutants were isolated; eight showed motility loss without significant body form changes.
    • Mutant cn101 (cha-1 allele) displayed reversible paralysis with a hypercontracted, coiled body form and resistance to acetylcholinesterase inhibitors at restrictive temperatures.
    • Mutant mah-2 (cn110) exhibited rapid, reversible paralysis with a straight, rigid body form and was mapped 0.6 map units left of dpy-6.

    Conclusions:

    • The developed screening method is effective for isolating temperature-sensitive paralytic mutants in C. elegans.
    • The characterized mutants, particularly cn101 and mah-2 (cn110), provide new tools for investigating neuromuscular function and development.
    • No muscle structural disorganization was observed, suggesting defects in neuronal or neuromuscular signaling pathways.