Medaka Oct4 is expressed during early embryo development, and in primordial germ cells and adult gonads

Ana V. Sánchez-Sánchez, Esther Camp, Antonio García-España, Aránzazu Leal-Tassias, José L. Mullor

Research output: Contribution to journalArticlepeer-review

50 Citations (Scopus)


Oct4 is a crucial transcription factor for controlling pluripotency in embryonic stem cells and the epiblast of mouse embryos. We have characterized the expression pattern of medaka (Oryzias latipes) Ol-Oct4 during embryonic development and in the adult gonads. Genomic analysis showed that Ol-Oct4 is the ortholog of zebrafish spg/pou2. However, their expression patterns are not the same, suggesting that Oct4 may play different roles in zebrafish and medaka. Using specific antibodies for the Ol-Oct4 protein, we showed that Ol-Oct4 is also expressed in primordial germ cells, in the spermatogonia (male germ stem cells), and during different stages of oocyte development. These results suggest that Ol-Oct4 plays a post-embryonic role in the maturing gonads and gametes. The Ol-Oct4 mRNA and protein expression patterns are similar to those of mammalian Oct4 and introduce medaka fish as a valid model for the functional and evolutionary study of pluripotency genes in vivo.

Original languageEnglish
Pages (from-to)672-679
Number of pages8
JournalDevelopmental Dynamics
Issue number2
Publication statusPublished or Issued - Feb 2010
Externally publishedYes


  • Gonads
  • Medaka
  • Oct4
  • PGC
  • Pluripotency

ASJC Scopus subject areas

  • Developmental Biology

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