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Related Experiment Videos

Mutations resulting in resistance to polyene antibiotics decrease voltage-sensitive calcium channel activity in

M Forte, T Hennessey, C Kung

    Journal of Neurogenetics
    |March 1, 1986
    PubMed
    Summary
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    Researchers isolated Paramecium tetraurelia mutants resistant to polyene antibiotics like amphotericin B and filipin. These mutations alter ion channel function, specifically decreasing calcium channel activity.

    Area of Science:

    • Cell Biology
    • Genetics
    • Pharmacology

    Background:

    • Polyene antibiotics, such as amphotericin B and filipin, target membrane sterols, leading to cell death.
    • Understanding resistance mechanisms to these antibiotics is crucial for their therapeutic applications and biological studies.

    Purpose of the Study:

    • To isolate and characterize Paramecium tetraurelia mutants exhibiting resistance to amphotericin B and filipin.
    • To investigate the genetic basis and functional consequences of polyene antibiotic resistance in Paramecium.

    Main Methods:

    • Isolation of drug-resistant mutants using selective pressure with amphotericin B and filipin.
    • Genetic mapping to determine complementation groups and allelism with known mutations.
    • Behavioral assays and electrophysiological recordings to assess ion channel function.

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    Main Results:

    • Six mutants (4 resistant to amphotericin B, 2 to filipin) were isolated; each mutant showed cross-resistance to both antibiotics.
    • All six resistance mutations mapped to a single complementation group, distinct from known pawn and barium shy mutations.
    • Electrophysiological analysis revealed a specific decrease in voltage-sensitive Ca2+ channel activity in a resistant mutant.

    Conclusions:

    • The identified mutations confer resistance to polyene antibiotics by altering membrane sterol interactions or downstream signaling.
    • These findings suggest a link between polyene antibiotic sensitivity and voltage-sensitive Ca2+ channel function in Paramecium.
    • The study provides a valuable genetic tool for exploring the roles of specific ion channels in cellular processes and drug responses.