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Related Concept Videos

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Related Experiment Video

Updated: Jun 26, 2025

Combining Mitotic Cell Synchronization and High Resolution Confocal Microscopy to Study the Role of Multifunctional Cell Cycle Proteins During Mitosis
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KCTD Proteins Have Redundant Functions in Controlling Cellular Growth.

Robert Rizk1, Dominic Devost1, Darlaine Pétrin1

  • 1Department of Pharmacology and Therapeutics, McGill University, 3655 Promenade Sir-William-Osler, Room 1303, Montréal, QC H3G 1Y6, Canada.

International Journal of Molecular Sciences
|May 11, 2024
PubMed
Summary
This summary is machine-generated.

This study reveals that KCTD2, KCTD5, and KCTD17 proteins have overlapping functions crucial for cell survival and proliferation. Their combined absence significantly impacts cell growth and gene expression, highlighting a key role in cellular homeostasis.

Keywords:
Heterotrimeric G proteinsKCTD proteinscell growthcellular signaling

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Area of Science:

  • Molecular Biology
  • Cell Biology
  • Genetics

Background:

  • Potassium Channel Tetramerization Domain (KCTD) proteins are structurally related.
  • Functional redundancy among KCTD protein family members is not well understood.
  • The role of KCTD proteins in cellular processes like growth and gene expression requires further investigation.

Purpose of the Study:

  • To investigate the functional redundancy of KCTD2, KCTD5, and KCTD17 proteins.
  • To determine the impact of progressive knockout of these KCTD isoforms on cell growth and gene expression.
  • To elucidate the relationship between KCTD proteins and Gβ1 in transcriptional regulation.

Main Methods:

  • CRISPR/Cas9 genome editing was employed to progressively knock out KCTD2, KCTD5, and KCTD17 in HEK 293 cells.
  • Validated knockout efficiency was confirmed.
  • Cell growth and gene expression patterns were assessed following progressive KCTD isoform knockout.
  • Gene expression profiles were compared between GNB1 knockout and KCTD knockout cells.

Main Results:

  • Progressive knockout of KCTD isoforms, especially the triple knockout, significantly affected cell growth, indicating conserved functions.
  • Gene expression patterns showed progressive changes correlating with KCTD isoform knockout.
  • GNB1 knockout altered expression of other G protein subunit genes, whereas KCTD knockout had an opposing effect, suggesting regulation of Gβ1 levels.
  • A unique relationship between KCTD proteins and Gβ1 was identified.

Conclusions:

  • This subfamily of KCTD proteins plays a global role in maintaining cell survival and proliferation.
  • KCTD proteins are involved in regulating Gβ1 levels, impacting transcriptional control.
  • Functional redundancy exists among KCTD2, KCTD5, and KCTD17 proteins.