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Nuclear protein sorting is the selective trafficking of histones, polymerases, gene regulatory proteins into the nucleus and exporting RNAs and ribosomes to the cytosol. It is a tightly controlled process that regulates gene expression within a cell.
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CNOT1 contributes to small nuclear non-coding RNA maturation.

Chisato Umehara1, Reika Sakurai1, Hiroaki Sako2

  • 1Keio University School of Medicine, 35 Shinanomachi, Shinjuku, Tokyo, 160-8582, Japan.

Biochemical and Biophysical Research Communications
|December 26, 2025
PubMed
Summary
This summary is machine-generated.

The CCR4-NOT complex, known for regulating gene expression, may also control the maturation of small nuclear noncoding RNAs. This study suggests CNOT1 subunit involvement in this novel regulatory role.

Keywords:
CCR4-NOTNon-coding RNASmall nuclear non-coding RNAWGCNAsnoRNA

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Area of Science:

  • Molecular Biology
  • Gene Regulation
  • RNA Biology

Background:

  • The CCR4-NOT complex is a key regulator of mRNA fate, impacting transcription, translation, and degradation.
  • Its full range of cellular functions remains incompletely understood, prompting investigation into novel roles.

Purpose of the Study:

  • To explore potential unknown functions of the CCR4-NOT complex.
  • To investigate the hypothesis that CCR4-NOT regulates small nuclear noncoding RNA (sncRNA) biogenesis using co-expression network analysis.

Main Methods:

  • Co-expression network analysis was employed to identify genes functionally associated with CCR4-NOT subunits.
  • Knockdown experiments targeting CNOT1 were performed to assess its impact on sncRNA levels.
  • Rescue experiments involving co-suppression of RBM7 were conducted to elucidate the mechanism of CNOT1 action.

Main Results:

  • All CCR4-NOT subunits exhibited high co-expression with modulators of small nuclear noncoding RNA biogenesis.
  • Knockdown of CNOT1 led to decreased sncRNA expression, independent of canonical CCR4-NOT functions.
  • Co-suppression of RBM7 rescued the sncRNA reduction, indicating a role in processing or stability.

Conclusions:

  • The findings suggest a novel function for the CCR4-NOT complex, specifically the CNOT1 subunit, in regulating the maturation of small nuclear noncoding RNAs.
  • This regulatory role appears distinct from the complex's established functions in mRNA metabolism.