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Ablation of a Single Cell From Eight-cell Embryos of the Amphipod Crustacean Parhyale hawaiensis
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Ablation of a Single Cell From Eight-cell Embryos of the Amphipod Crustacean Parhyale hawaiensis

Published on: March 17, 2014

Clonal variation in paramecium. I. Persistent unstable clones

I Finger, C Heller, L Dilworth

    Genetics
    |September 1, 1972
    PubMed

    Insights

    Paramecium serotype stability varies between clones. Unstable clones produce diverse serotypes, while stable clones maintain their original type, with medium changes influencing this interconversion.

    Area of Science:

    • * Protozoology
    • * Cell Biology
    • * Genetics

    Background:

    • * Clones of Paramecium (single-celled eukaryotes) with identical serotypes can exhibit different stabilities.
    • * Some clones consistently produce progeny of the same serotype (stable), while others generate diverse subclones with new serotypes (unstable).

    Purpose of the Study:

    • * To investigate the factors influencing serotype stability and interconversion in Paramecium clones.
    • * To understand the mechanisms underlying the generation of diverse serotypes from initially identical clones.

    Main Methods:

    • * Culturing of Paramecium clones in laboratory settings.
    • * Monitoring of serotype expression in parent clones and their subclones over time.
    • * Manipulation of culture medium conditions to assess effects on serotype stability.

    Main Results:

    • * Stable Paramecium clones yield genetically identical progeny, whereas unstable clones repeatedly produce diverse subclones with novel serotypes.
    • * Stable lines exhibit resistance to changes in culture medium and sera, unlike unstable lines where these agents influence subclone serotype diversity.
    • * Frequent replacement of culture medium with fresh fluid facilitates interconversion between stable and unstable clones.

    Conclusions:

    • * Serotype stability in Paramecium is a dynamic trait influenced by environmental factors, particularly medium composition.
    • * The interconversion between stable and unstable clones suggests a regulatory mechanism sensitive to the removal of cellular products or depletion of medium components.

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