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Yeast As a Chassis for Developing Functional Assays to Study Human P53
14:57

Yeast As a Chassis for Developing Functional Assays to Study Human P53

Published on: August 4, 2019

Retrotransposition-Competent Human LINE-1 Induces Apoptosis in Cancer Cells With Intact p53

Abdelali Haoudi, O John Semmes, James M Mason

    Journal of Biomedicine & Biotechnology
    |October 7, 2004
    PubMed

    Insights

    Human LINE-1 (L1) retrotransposition activates the p53 apoptotic pathway in cancer cells. Inactivating p53 prevents this apoptosis, suggesting L1 transposition is recognized as DNA damage.

    Area of Science:

    • Genetics
    • Molecular Biology
    • Cancer Research

    Background:

    • Human LINE-1 (L1) elements are non-LTR retrotransposons.
    • L1 retrotransposition is a known cause of insertional mutagenesis.
    • The effects of L1 retrotransposition on cell growth and differentiation are largely unknown.

    Purpose of the Study:

    • To investigate the biological effects of L1 retrotransposition on cell growth.
    • To determine the impact of human L1 retrotransposition on cancer cell growth.
    • To explore the relationship between L1 transposition and cancer cell pathways.

    Main Methods:

    • Examined human cancer cell lines with complete L1 retrotransposition.
    • Assessed the p53-mediated apoptotic pathway.
    • Investigated the role of p53 status (wild-type vs. inactivated) in apoptosis induction.

    Main Results:

    • L1 retrotransposition activates the p53-mediated apoptotic pathway in cancer cells with wild-type p53.
    • Inactivation of p53 inhibits apoptosis induction during L1 retrotransposition.
    • Suggests a strong association between active L1 retrotransposition and p53-dependent apoptosis.

    Conclusions:

    • Human L1 retrotransposition is recognized by cells as a "genetic damaging event".
    • Massive retrotransposition triggers signaling pathways leading to apoptosis.
    • L1 retrotransposition impacts cancer cell fate through the p53 pathway.

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