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Related Experiment Videos

Regulating gene expression through RNA nuclear retention.

Kannanganattu V Prasanth1, Supriya G Prasanth, Zhenyu Xuan

  • 1Cold Spring Harbor Laboratory, 1 Bungtown Road, Cold Spring Harbor, New York 11724, USA.

Cell
|October 22, 2005
PubMed
Summary
This summary is machine-generated.

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Researchers discovered CTN-RNA, a nuclear-retained RNA that regulates mCAT2 protein levels. Under stress, CTN-RNA is cleaved, producing mCAT2 mRNA for rapid cellular response.

Area of Science:

  • Molecular Biology
  • Genetics
  • Cell Biology

Background:

  • Eukaryotic genome regulation involves complex mechanisms.
  • Nuclear-retained RNAs play roles in gene expression control.
  • The mouse cationic amino acid transporter 2 (mCAT2) gene encodes a protein involved in amino acid transport.

Purpose of the Study:

  • To identify and characterize novel regulatory RNA molecules.
  • To investigate the function of CTN-RNA in gene expression.
  • To elucidate the mechanism by which CTN-RNA regulates mCAT2 mRNA levels.

Main Methods:

  • Identification of CTN-RNA, a ~8 kb nuclear-retained poly(A)+ RNA.
  • Analysis of CTN-RNA transcription from the mCAT2 gene via alternative promoter and poly(A) site usage.

Related Experiment Videos

  • Investigation of CTN-RNA localization within the nucleus (diffuse and paraspeckles).
  • Study of adenosine-to-inosine editing in the 3'UTR of CTN-RNA for nuclear retention.
  • Assessment of mCAT2 mRNA levels following CTN-RNA knockdown.
  • Analysis of CTN-RNA processing under physiologic stress.

    • Main Results:

    • CTN-RNA was identified as a mouse tissue-specific, nuclear-retained poly(A)+ RNA.
    • CTN-RNA regulates the expression level of its protein-coding partner, mCAT2.
    • Nuclear retention of CTN-RNA is mediated by adenosine-to-inosine editing in its 3'UTR.
    • Knockdown of CTN-RNA leads to a downregulation of mCAT2 mRNA.
    • CTN-RNA is posttranscriptionally cleaved under stress conditions to generate protein-coding mCAT2 mRNA.

    Conclusions:

    • The cell nucleus harbors stable RNA molecules (CTN-RNA) for rapid deployment upon stress.
    • CTN-RNA acts as a regulatory RNA, controlling mCAT2 mRNA levels.
    • This mechanism highlights a paradigm for nuclear-retained RNA in regulating gene expression in response to physiologic stress.