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In 1928, a German botanist Emil Heitz observed the moss nuclei with a DNA binding dye. He observed that while some chromatin regions decondense and spread out in the interphase nucleus, others do not. He termed them euchromatin and heterochromatin, respectively. He proposed that the heterochromatin regions reflect a functionally inactive state of the genome. It was later confirmed that heterochromatin is transcriptionally repressed, and euchromatin is transcriptionally active chromatin.
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A structural basis for variegating position effects.

K D Tartof, C Hobbs, M Jones

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    |July 1, 1984
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    Summary
    This summary is machine-generated.

    Variegating position effects in Drosophila are caused by gene rearrangements near heterochromatin. This study identifies breakpoints and mobile elements involved, suggesting a model for heterochromatic gene regulation.

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    Area of Science:

    • Genetics
    • Molecular Biology
    • Developmental Biology

    Background:

    • Variegating position effects in Drosophila arise from chromosome rearrangements.
    • Genes positioned near heterochromatin can be inactivated in some cells, leading to variegated tissues.

    Purpose of the Study:

    • To investigate the molecular basis of variegating position effects in Drosophila.
    • To identify the location of euchromatic breakpoints and associated genetic elements in white mutants.

    Main Methods:

    • Analysis of chromosome rearrangements in variegating white mutants of Drosophila.
    • Mapping of euchromatic breakpoints relative to the white gene.
    • Characterization of heterochromatic junctions and associated mobile genetic elements.

    Main Results:

    • Euchromatic breakpoints for three variegating white mutants are clustered approximately 25 kb downstream of the white gene.
    • The white locus is adjoined to a mobile genetic element in the heterochromatin in these mutants.
    • Revertants of the wm4 mutant retain heterochromatin-derived sequences at the new white locus location.

    Conclusions:

    • The findings suggest mobile genetic elements play a role in mediating variegating position effects.
    • A model is proposed for the structure of heterochromatic domains and the mechanisms of position effect variegation.