Transcriptional regulation of Zic3 by heterodimeric AP-1(c-Jun/c-Fos) during Xenopus development

Sung Young Lee, Hyun Shik Lee, Jin Soo Moon, Jong Il Kim, Jae Bong Park, Jae Yong Lee, Mae Ja Park, Jaebong Kim

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16 Scopus citations


The heterodimeric c-Jun/c-Fos, an activator protein-1 (AP-1) has been implicated in mesoderm induction (Dong et al., 1996; Kim et al., 1998) whereas the homodimer of c-Jun was reported to be involved in neural inhibition during the early development of Xenopus embryos. During the early vertebrate development AP-1 involvement in the neural induction is still not clearly understood. We report here that AP-1 has a role in Zic3 expression, a critical proneural gene and a primary regulator of neural and neural crest development (Nakata et al., 1997; Nakata et al., 1998). AP-1 was able to induce the Zic3 gene in a dose dependent manner but other homoor hetero-dimeric proteins, such as c-Jun/c-Jun, JunD/FosB or JunD/Fra-1 were not. The inhibition of AP-1 activity using morpholino antisenses of c-jun mRNAs blocked the Zic3 expression induced by activin. In addition, co-injection of c-jun mRNA rescued the down-regulated Zic3 expression. The promoter region of isolated Zic3 genomic DNA was found to possess several consensus-binding site of AP-1. Thus, in the functional assays, AP-1 could increase promoter activity of Zic3 gene. These findings suggest that proneural gene, Zic3 may be regulated by heterodimeric AP-1(c-Jun/c-Fos) and it may have a role in activin signaling for the regulation of neural specific gene, Zic3.

Original languageEnglish (US)
Pages (from-to)468-475
Number of pages8
JournalExperimental and Molecular Medicine
Issue number5
StatePublished - Oct 31 2004


  • AP-1(c-Jun & c-Fos)
  • Activin
  • Xenopus development
  • Zic3


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