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Related Experiment Videos

A T to A base substitution and small deletions in the conalbumin TATA box drastically decrease specific in vitro

B Wasylyk, P Chambon

    Nucleic Acids Research
    |April 24, 1981
    PubMed
    Summary

    Mutations in the conalbumin TATA box significantly reduce gene transcription. Altering specific DNA sequences, like T to G or T to A transversions, impairs RNA polymerase B binding and initiation.

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    Area of Science:

    • Molecular Biology
    • Genetics
    • Biochemistry

    Background:

    • The conalbumin "TATA" box is crucial for specific transcription initiation.
    • Previous studies indicated a T to G transversion severely impacts transcription by RNA polymerase B.

    Purpose of the Study:

    • To investigate the impact of a T to A transversion at the second T of the conalbumin "TATA" box on transcription.
    • To assess the effect of small nucleotide deletions within the "TATA" box on transcription initiation.

    Main Methods:

    • Site-directed mutagenesis of the conalbumin "TATA" box.
    • Assessing specific transcription initiation by RNA polymerase B.

    Main Results:

    • A T to A transversion at the second T of the "TATA" box drastically decreased transcription.

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  • Small deletions (2, 3, and 4 nucleotides) in the "TATA" box also significantly reduced specific transcription initiation.
  • Findings suggest mutations affect transcription via altered nucleotide recognition rather than helix stability.

    • Conclusions:

    • The precise nucleotide sequence of the "TATA" box is critical for accurate transcription initiation.
    • Both point mutations and deletions within the "TATA" box severely impair RNA polymerase B-mediated transcription.