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Developmental regulation of a cyclin-dependent kinase inhibitor controls postembryonic cell cycle progression in

Y Hong1, R Roy, V Ambros

  • 1Department of Biological Sciences, Dartmouth College, Hanover, New Hampshire 03755, USA.

Development (Cambridge, England)
|August 26, 1998
PubMed

Insights

The C. elegans cki-1 gene, a cyclin-dependent kinase inhibitor, regulates cell cycle progression during development. Its activity is crucial for suspending cell division in response to environmental cues and in specific cell types like vulva precursor cells.

Area of Science:

  • Developmental Biology
  • Cell Cycle Regulation
  • Molecular Genetics

Background:

  • The CIP/KIP family of cyclin-dependent kinase inhibitors plays a critical role in cell cycle control.
  • Understanding the regulation of cell cycle progression during postembryonic development is essential for comprehending developmental processes.

Purpose of the Study:

  • To investigate the function of the C. elegans cki-1 gene in linking developmental programs to cell cycle progression.
  • To elucidate the role of cki-1 in developmental timing and cell cycle arrest.

Main Methods:

  • Utilized cki-1::GFP expression patterns to study developmental regulation.
  • Employed ectopic expression and RNA-mediated interference (RNAi) to manipulate cki-1 activity.
  • Examined cell cycle progression in response to environmental signals and in specific cell lineages (VPCs).

Main Results:

  • cki-1 is developmentally regulated in blast and differentiating cells, coinciding with G1 phase.
  • Ectopic CKI-1 expression causes premature G1 arrest, while RNAi leads to extra larval cell divisions.
  • cki-1 activity is necessary for cell cycle suspension in dauer and starved L1 larvae.
  • Heterochronic genes regulate VPCs via cki-1 to maintain G1 arrest during L2 stage.

Conclusions:

  • cki-1 is a key regulator of developmental G1/S transitions in C. elegans.
  • cki-1 integrates environmental signals and developmental timing to control cell proliferation.
  • The study highlights cki-1's essential role in developmental cell cycle arrest and timing.

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