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A model of clonal attenuation

J Prothero, J A Gallant

    Proceedings of the National Academy of Sciences of the United States of America
    |January 1, 1981
    PubMed
    Summary
    This summary is machine-generated.

    Existing clonal attenuation models fail to explain fibroblast replicative potential data. A new model proposes gradual commitment probability increase during cell growth, aligning with experimental findings.

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    Area of Science:

    • Cell Biology
    • Theoretical Biology
    • Aging Research

    Background:

    • Clonal attenuation models by Kirkwood & Holliday (1975) and Shall & Stein (1979) describe cellular aging.
    • Recent data show changing replicative potential distribution in subcloned fibroblasts.

    Purpose of the Study:

    • To evaluate existing clonal attenuation models against new experimental data.
    • To propose a new model consistent with observed fibroblast behavior.

    Main Methods:

    • Analysis of experimental data on fibroblast subcloning and replicative potential.
    • Comparison of experimental results with predictions from two formal theoretical models.

    Main Results:

    • Experimental data contradict both the Kirkwood & Holliday and Shall & Stein models.

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  • A new model is proposed that fits the observed subcloning data.

    • Conclusions:

    • The proposed model suggests a gradual increase in commitment probability during cell culture.
    • This model incorporates a limited number of post-commitment divisions (approx. seven).
    • The gradual commitment increase is consistent with autogenously regulated gene product accumulation.