Isolation and identification of gametogenesis-related genes in Porphyra yezoensis (Rhodophyta) using subtracted cDNA libraries

  • Makoto Kakinuma
  • Izumi Kaneko
  • Daniel A. Coury
  • Takuya Suzuki
  • Hideomi Amano
Conference paper
Part of the Developments in Applied Phycology book series (DAPH, volume 1)


Gametogenesis of Porphyra yezoensis thalli is induced by ageing as well as by changing water temperature and photoperiod. Under laboratory conditions, thalli cultivated at 10 °C with a 10:14 h (light: dark) cycle develop vegetatively to adult form without gametogenesis. On the other hand, sexual reproduction, which involves differentiation of vegetative cells and subsequent gametogenesis, is induced by culturing at 15 °C with a 16: 8 h (light: dark) cycle. We have constructed subtracted cDNA libraries enriched for differentially expressed transcripts in vegetative and reproductive thalli, and randomly selected 1,152 cDNAs from each subtracted library. Results of the dot blot analyses used for identification of differentially expressed cDNAs indicated that mRNA levels of 176 and 138 cDNAs tended to increase in the vegetative and reproductive thalli, respectively. BLAST analysis of nucleotide and deduced amino acid sequences showed that the cDNAs represented 63 and 59 unique clones for the vegetative and reproductive cDNA enriched subtracted libraries, respectively. Interestingly, some of the cDNAs isolated from the reproductive subtracted library were homologous to genes encoding protein kinases, GTP-binding protein, and heat shock proteins involved in signal transduction and the molecular chaperon system.

Key words

cDNA gametogenesis gene expression Porphyra yezoensis Rhodophyta subtracted cDNA library 


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Copyright information

© Springer 2006

Authors and Affiliations

  • Makoto Kakinuma
    • 1
  • Izumi Kaneko
    • 1
  • Daniel A. Coury
    • 1
  • Takuya Suzuki
    • 1
  • Hideomi Amano
    • 1
  1. 1.Laboratory of Marine Biochemistry, Faculty of BioresourcesMie UniversityTsu, MieJapan

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