Different G1 cyclins control the timing of cell cycle commitment in mother and daughter cells of the budding yeast S. cerevisiae

Cell. 1992 Apr 17;69(2):317-27. doi: 10.1016/0092-8674(92)90412-6.


Growth of S. cerevisiae cells by budding gives rise to asymmetric progeny cells: a larger "mother" cell and a smaller "daughter" cell. The mother cell transits a brief G1 phase before forming a new bud and beginning DNA replication. The daughter cell stays in G1 for a longer period, growing in size before initiating a new cell cycle. We show that the timing of cell cycle initiation in mother and daughter cells is governed by different G1 cyclins. In daughter cells, transcription of CLN1 and CLN2 is induced in a size-dependent manner, and these cyclins are necessary for the normal timing of cell cycle initiation. CLN3 is not required in daughter cells, but is crucial for mother cells, in which the G1 phase is much longer in the absence of this cyclin.

Publication types

  • Comparative Study
  • Research Support, Non-U.S. Gov't
  • Research Support, U.S. Gov't, P.H.S.

MeSH terms

  • CDC28 Protein Kinase, S cerevisiae
  • Cell Cycle
  • Cell Division
  • Cyclins / analysis*
  • Cyclins / genetics
  • G1 Phase
  • Protein Kinases / analysis*
  • Saccharomyces cerevisiae / cytology*
  • Saccharomyces cerevisiae / genetics
  • Time Factors
  • Transcription, Genetic


  • Cyclins
  • Protein Kinases
  • CDC28 Protein Kinase, S cerevisiae