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Related Experiment Videos

Discrete elements within the SV40 enhancer region display different cell-specific enhancer activities.

B Ondek, A Shepard, W Herr

    The EMBO Journal
    |April 1, 1987
    PubMed
    Summary

    SV40 enhancer elements A, B, and C can function independently as enhancers when duplicated. Multiple copies of these elements increase enhancer activity, with distinct cell-specific functions observed for B and C elements.

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    Area of Science:

    • Molecular Biology
    • Genetics

    Background:

    • The Simian Virus 40 (SV40) enhancer is a crucial regulatory region controlling gene expression.
    • It comprises three genetically defined elements (A, B, and C) that exhibit functional redundancy.

    Purpose of the Study:

    • To investigate the autonomous enhancer activity of individual SV40 enhancer elements (A, B, C).
    • To determine the impact of copy number and specific sequences on enhancer function and cell-specificity.

    Main Methods:

    • Utilized short, synthetic DNA oligonucleotides to create tandem copies of SV40 enhancer elements.
    • Assessed enhancer activity in five different cell lines using oligomer constructs with varying copy numbers and point mutations.
    • Analyzed the role of core and octamer consensus sequences within these elements.

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    Main Results:

    • Multiple tandem copies of elements B and C function autonomously as enhancers.
    • Enhancer activity increases with the copy number of element B.
    • Elements B and C display distinct cell-specific activities, suggesting interaction with different trans-acting factors.
    • Mutated elements and consensus sequences alone lacked enhancer activity, indicating functional units.

    Conclusions:

    • SV40 enhancer elements function as discrete units of enhancer activity.
    • Tandem duplication of these elements, as seen in SV40, broadens the conditions under which enhancer function can occur.
    • Cell-specific activities are mediated by interactions with distinct cellular factors.