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The flow of genetic information in cells from DNA to mRNA to protein is described by the central dogma, which states that genes specify the sequence of mRNAs, which in turn specify the sequence of amino acids making up all proteins. The decoding of one molecule to another is performed by specific proteins and RNAs. Because the information stored in DNA is so central to cellular function, it makes intuitive sense that the cell would make mRNA copies of this information for protein synthesis...
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Identifying Mutations by High Resolution Melting in a TILLING Population of Rice
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A single genetic unit specifies two transposition functions in the maize element activator.

H Dooner, J English, E Ralston

    Science (New York, N.Y.)
    |October 10, 1986
    PubMed
    Summary

    The maize Activator (Ac) transposable element induces and inhibits its own transposition via two genetic functions. Both functions originate from a single genetic unit, requiring Open Reading Frames 1 and 2 for full activity.

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    Area of Science:

    • Genetics
    • Molecular Biology
    • Plant Science

    Background:

    • Maize transposable elements Activator (Ac) and Dissociation (Ds) are mobile genetic sequences.
    • Ac exhibits dual functions: inducing Ds transposition and inhibiting transposition with increased dosage.
    • Previous studies identified three open reading frames (ORFs) within the Ac element.

    Purpose of the Study:

    • To investigate the genetic basis of Ac's dual functions (transposition induction and dosage-dependent inhibition).
    • To determine the roles of specific ORFs within the Ac element in mediating these functions.
    • To understand the genetic complementation between different Ds elements.

    Main Methods:

    • Analysis of Ac and Ds element derivatives (wx-m9(Ds) and bz-m2(DI)) with specific deletions.
    • Genetic complementation assays to assess transposition restoration.
    • Characterization of deletion locations within Ac's ORFs.

    Main Results:

    • A deletion in ORF 1 of wx-m9(Ds) abolished transposition.
    • A deletion primarily in ORF 2 of bz-m2(DI) also resulted in a defective Ds element.
    • wx-m9(Ds) and bz-m2(DI) did not genetically complement to restore Ac's transposition function.
    • bz-m2(DI) did not contribute to Ac's inhibitory dosage effect.

    Conclusions:

    • Both ORF 1 and ORF 2 are jointly required for Ac's transposition-inducing function.
    • The induction and inhibition of transposition by Ac stem from the same genetic functional unit.
    • The study elucidates the molecular basis of Ac transposable element regulation.