Cloning of cDNAs encoding Bombyx homologues of Cdc2 and Cdc2-related kinase from eggs

H. Iwasaki, M. Takahashi, T. Niimi, O. Yamashita, T. Yaginuma*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

15 Citations (Scopus)


In diapausing eggs of the silkworm, Bombyx mori, embryonic cells are arrested at G2 phase. The ability to undertake cell division is resumed in the course of dispause termination caused by such a treatment as acclimation to 5°C. As an initial trial to investigate the relationship between diapause end embryonic cell cycling, we have cloned and sequenced two Bombyx cDNAs encoding two distinct cdc2-related Ser/Thr protein kinases. One (Bm cdc2) encoded a 37.0 kDa protein which had all of the domains characteristic of other Cdc2 kinase. The other (Bcdrk) encoded a 45.1 kDa protein that was most similar to Drosophila and human cdc2-related protein kinases (Dcdrkprotein and PISSRLE kinase). Northern blot analysis was carried out to examine levels of Bm cdc2 end Bcdrk mRNA during embryogenesis of non-diapause eggs. The result demonstrated that the mRNA level of Bm cdc2 appeared to correspond to the activity of nuclear/cellular division in non-diapause eggs, and that the developmental profile in the level of Bcdrk mRNA was somewhat different from that of Bm cdc2 mRNA.

Original languageEnglish
Pages (from-to)131-141
Number of pages11
JournalInsect Molecular Biology
Issue number2
Publication statusPublished - 1997 May
Externally publishedYes


  • Bombyx mori
  • Cdc2-related kinase
  • cell division
  • embryonic dispause
  • mRNA

ASJC Scopus subject areas

  • Molecular Biology
  • Genetics
  • Insect Science


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