Current Genetics

, Volume 46, Issue 5, pp 304–315

The transcriptional program of synchronous gametogenesis in Chlamydomonas reinhardtii

  • J. Abe
  • T. Kubo
  • Y. Takagi
  • T. Saito
  • K. Miura
  • H. Fukuzawa
  • Y. Matsuda
Research Article

DOI: 10.1007/s00294-004-0526-4

Cite this article as:
Abe, J., Kubo, T., Takagi, Y. et al. Curr Genet (2004) 46: 304. doi:10.1007/s00294-004-0526-4

Abstract

Cells of Chlamydomonas reinhardtii undergo gametogenesis to produce sexually competent gametes under nitrogen-starved conditions. By using a synchronized system for gametogenesis of early G1 cells, several previously identified marker genes and 18 novel nitrogen-starved gametogenesis (NSG) genes isolated by macroarray analysis were placed into at least three temporal classes of expression. Early genes are induced transiently in the first 2 h after transfer to nitrogen-free medium. Middle genes are strongly induced between 3 h and 4 h after nitrogen removal, a time corresponding to the acquisition of mating competency, suggesting their involvement in the gamete program. Late genes are induced between 5 h and 8 h after nitrogen removal, a time after the completion of gametic differentiation, suggesting that they are not directly involved in the formation of sexually competent gametes. All of the 18 NSG genes examined are induced in both mating-type plus and minus gametes and about two-thirds of the genes are also expressed in the mitotic cell cycle, especially at S/M phases.

Keywords

Chlamydomonas reinhardtii Nitrogen-starved gametogenesis Temporal program Transcript levels 

Copyright information

© Springer-Verlag 2004

Authors and Affiliations

  • J. Abe
    • 1
  • T. Kubo
    • 1
  • Y. Takagi
    • 1
  • T. Saito
    • 2
  • K. Miura
    • 3
  • H. Fukuzawa
    • 3
  • Y. Matsuda
    • 4
  1. 1.Department of Molecular Science, Graduate School of Science and TechnologyKobe UniversityKobe 657-8501Japan
  2. 2.Department of Applied Science, Faculty of ScienceOkayama University of ScienceOkayama 700-0005Japan
  3. 3.Division of Integral Life Science, Graduate School of BiostudiesKyoto UniversityKyoto 606-8502Japan
  4. 4.Department of Biology, Faculty of ScienceKobe UniversityKobe 657-8501Japan