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Programmed gene rearrangements altering gene expression.

P Borst, D R Greaves

    Science (New York, N.Y.)
    |February 6, 1987
    PubMed
    Summary
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    Programmed gene rearrangements, including DNA inversion and transposition, enable organisms to adapt by altering gene expression and function. These mechanisms allow for pre-adaptation to environmental changes, crucial for survival and evading host defenses.

    Area of Science:

    • Molecular Biology
    • Genetics
    • Microbiology

    Background:

    • Programmed gene rearrangements are natural processes.
    • These rearrangements alter gene copy number, create diversity, and control gene expression.
    • Mechanisms include DNA inversion and DNA transposition.

    Purpose of the Study:

    • To explain the mechanisms of programmed gene rearrangements.
    • To highlight their role in gene expression control.
    • To discuss their significance in unicellular organisms and host-pathogen interactions.

    Main Methods:

    • DNA inversion: site-specific recombination flips DNA segments.
    • DNA transposition: gene movement and displacement via gene conversion.
    • Analysis of gene rearrangements in unicellular organisms.

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    Main Results:

    • Gene rearrangements alter gene copy number (amplification/deletion).
    • They create diversity by reassorting gene segments.
    • Expression control achieved via DNA inversion and transposition.

    Conclusions:

    • Gene rearrangements allow pre-adaptation to environmental changes.
    • Antigenic variation in pathogens like trypanosomiasis is controlled by these mechanisms.
    • Facilitates evasion of host immune responses.