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    • University of Missouri-Columbia
    • Graduate School - MU Theses and Dissertations (MU)
    • Theses and Dissertations (MU)
    • Dissertations (MU)
    • 2006 Dissertations (MU)
    • 2006 MU dissertations - Freely available online
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    Centromere function and evolution in maize (Zea mays)

    Lamb, Jonathan C., 1977-
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    Date
    2006
    Format
    Thesis
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    Abstract
    A dispensable supernumerary chromosome present in maize, the B chromosome, was the focus of many centromere studies. First, I examine the variation in copy number of centromeric elements and other repeats among different maize lines. Then, I demonstrate that centromeric elements are present away from the centromere on the B chromosome indicating that centromeric elements are not sufficient for centromere function in maize. I demonstrate that the B centromere can be inactivated in dicentric chromosomes to produce stable, functionally monocentric chromosomes. Next, I examine the rate of divergence for centromeric elements in maize and its relatives in relation to other repetitive elements in the genome. I examined the genomic distribution of repetitive elements showing that certain families of retrotransposons are enriched in the heterochromatic regions flanking the centromere. Finally, I describe a novel chromosomal rearrangement, an inversion with a breakpoint in the centromere that splits the tract of centromere repeats creating a chromosome with two distinct sites of centromere elements.
    URI
    https://doi.org/10.32469/10355/4446
    https://hdl.handle.net/10355/4446
    Degree
    Ph. D.
    Thesis Department
    Biological sciences (MU)
    Rights
    OpenAccess.
    Collections
    • 2006 MU dissertations - Freely available online
    • Biological Sciences electronic theses and disserations (MU)

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