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Related Experiment Videos

Trans-acting temporal locus within the beta-glucuronidase gene complex.

A J Lusis, V M Chapman, R W Wangenstein

    Proceedings of the National Academy of Sciences of the United States of America
    |July 1, 1983
    PubMed
    Summary
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    Two regulatory loci within the beta-glucuronidase gene complex control enzyme levels in mice. Gus-u acts systemically, while Gus-t provides temporal, tissue-specific regulation.

    Area of Science:

    • Biochemistry
    • Genetics
    • Molecular Biology

    Background:

    • Mice with the beta-glucuronidase [Gus]H haplotype exhibit reduced enzyme levels and synthesis rates.
    • Gene regulation mechanisms are crucial for understanding enzyme activity and organismal development.

    Purpose of the Study:

    • To elucidate the genetic basis for decreased beta-glucuronidase levels in [Gus]H mice.
    • To differentiate the roles of systemic and temporal regulatory loci within the beta-glucuronidase gene complex.

    Main Methods:

    • Development of a novel method to quantify beta-glucuronidase A and H allozyme subunits.
    • Enzyme purification, methionyl residue cleavage with CNBr, and isoelectric focusing of peptides.
    • Quantitation of the specific peptide containing the A/H amino acid substitution.

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    Main Results:

    • Identified two distinct regulatory loci within the beta-glucuronidase gene complex: Gus-u and Gus-t.
    • Gus-u acts in cis, causing uniform, systemic reduction in enzyme levels across all tissues.
    • Gus-t acts in trans, mediating abrupt, tissue-specific, and stage-specific switches in enzyme synthesis rates.

    Conclusions:

    • The [Gus]H haplotype's reduced beta-glucuronidase activity results from the combined action of cis-acting systemic (Gus-u) and trans-acting temporal (Gus-t) regulators.
    • The existence of a trans-acting locus within a gene complex presents novel questions regarding its evolutionary origin and functional significance.
    • The developed peptide quantitation method is key to distinguishing these regulatory mechanisms.