Intracellular calcium signaling in the fertilized eggs of Annelida

Takeshi Nakano, Ryusaku Deguchi, Keiichiro Kyozuka

Research output: Contribution to journalReview articlepeer-review

8 Citations (Scopus)


Fertilization is such a universal and indispensable step in sexual reproduction, but a high degree of variability exists in the way it takes place in the animal kingdom. As discussed in other reviews in this issue, recent works on this subject clarified many points. However, important results on the mechanisms of fertilization are obtained mainly from a few restricted model organisms. In this sense, it is utterly important to collect more information from various phyla. In this review, we have re-introduced Annelida as one of the most suitable models for the analysis of fertilization process. We have briefly reviewed the historical works on the fertilization of Annelida. Then, we have described recent findings on the two independent Ca2+ increases in the fertilized eggs of Annelida, which arise from two different mechanisms and may have distinct physiological roles toward sperm entry and egg activation. We propose that the Ca2+ increase in the fertilized eggs reflect the specific needs of the zygote in a given species.

Original languageEnglish
Pages (from-to)1188-1194
Number of pages7
JournalBiochemical and biophysical research communications
Issue number3
Publication statusPublished - 2014 Aug 1


  • Annelida
  • Cortical protrusion
  • Egg activation
  • Egg microvilli
  • Fertilization
  • Sperm incorporation

ASJC Scopus subject areas

  • Biophysics
  • Biochemistry
  • Molecular Biology
  • Cell Biology


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