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Postinduction turnoff of beta-interferon gene expression.

L A Whittemore¹, T Maniatis

¹Department of Biochemistry and Molecular Biology, Harvard University, Cambridge, Massachusetts 02138.

Molecular and Cellular Biology

|April 1, 1990

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Viral induction increases human beta-interferon (IFN-beta) mRNA, but a rapid decrease follows. This turnoff involves transcriptional repression and mRNA decay, requiring a virus-inducible repressor and specific RNA sequences.

Area of Science:

Molecular Biology
Immunology
Gene Regulation

Background:

Viral induction elevates human beta-interferon (IFN-beta) mRNA levels.
Previous research attributed IFN-beta mRNA increase to enhanced gene transcription.

Purpose of the Study:

Investigate the mechanisms behind the rapid postinduction decrease in IFN-beta mRNA.
Identify sequence elements responsible for IFN-beta mRNA instability.

Main Methods:

Studied transcriptional regulation and mRNA decay kinetics.
Utilized cycloheximide to block protein synthesis and assess transcriptional repression.
Analyzed sequence requirements for mRNA instability using a heterologous mRNA system.

Main Results:

Related Experiment Videos

The postinduction decrease in IFN-beta mRNA results from both transcriptional repression and rapid mRNA turnover.
Transcriptional repression is dependent on the synthesis of a virus-inducible repressor, inhibitable by cycloheximide.
Two destabilizing regions in IFN-beta mRNA were identified: an AU-rich element in the 3' UTR and a region 5' to the stop codon.

Conclusions:

IFN-beta gene expression is tightly regulated by both transcriptional repression and mRNA destabilization.
Virus-inducible repressors and specific RNA sequences contribute to the transient nature of IFN-beta mRNA accumulation.
Understanding these mechanisms is crucial for controlling antiviral responses.