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Transposons make up a significant part of genomes of various organisms. Therefore, it is believed that transposition played a major evolutionary role in speciation by changing genome sizes and modifying gene expression patterns. For example, in bacteria, transposition can lead to conferring antibiotic resistance. Movement of transposable elements within the genetic pool of pathogenic bacteria can aid in transfer of antibiotic-resistant genetic elements. In eukaryotes, transposons can carry out...
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Transposons, or "jumping genes," are small mobile genetic elements (MGEs) that range from 700 to 40,000 base pairs in length. They are found in all organisms and can move within the same chromosome or transfer to different chromosomes. In some cases, transposons can also jump between different host DNA molecules, such as plasmids or viruses, contributing to genetic variability.Barbara McClintock first discovered these mobile genetic elements in the 1940s while studying maize genetics, and she...
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DNA-only transposons are called autonomous transposons since they code for the enzyme transposase that is required for the transposition mechanism. Insertion of transposons can alter gene functions in multiple ways. They can mutate the gene, alter gene expression by introducing a novel promoter or insulator sequence, introduce new splice sites, and change the mRNA transcripts produced, or remodel chromatin structure.
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Gene flow is the transfer of genes among populations, resulting from either the dispersal of gametes or from the migration of individuals.
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    Area of Science:

    • Evolutionary biology
    • Microbial genetics
    • Systems biology

    Background:

    • Adaptive functions' origins are poorly understood.
    • Escherichia coli strains with high-copy plasmids are used to study evolution.
    • Green fluorescent protein (GFP) expression in response to tetracycline is investigated.

    Purpose of the Study:

    • To investigate the de novo evolution of population-level feedback control in Escherichia coli.
    • To understand how selection maintains plasmids within single cells.
    • To analyze the relationship between GFP expression, bacterial fitness, and tetracycline response.

    Main Methods:

    • Utilized clonal Escherichia coli strains with high-copy plasmids.
    • Introduced a tetA-gfp tetracycline resistance transposon.
    • Applied selection pressures related to tetracycline and plasmid dynamics.

    Main Results:

    • Observed the de novo evolution of population-level feedback control.
    • Demonstrated that selection maintains tetA+ and tetA- plasmids via negative feedback.
    • Showed that small mutations can lead to significant changes in population behavior.

    Conclusions:

    • The evolution of polymorphic intracellular plasmid populations enables dynamic host responses to antibiotics.
    • Feedback control mechanisms can rapidly evolve in microbial populations.
    • This provides a model for understanding the evolution of adaptive functions.