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J Biol Chem 2015 Aug 14;29033:20273-83. doi: 10.1074/jbc.M115.646554.
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JmjC Domain-containing Protein 6 (Jmjd6) Derepresses the Transcriptional Repressor Transcription Factor 7-like 1 (Tcf7l1) and Is Required for Body Axis Patterning during Xenopus Embryogenesis.

Zhang X , Gao Y , Lu L , Zhang Z , Gan S , Xu L , Lei A , Cao Y .

Tcf7l1 (also known as Tcf3) is a bimodal transcription factor that plays essential roles in embryogenesis and embryonic and adult stem cells. On one hand, Tcf7l1 works as transcriptional repressor via the recruitment of Groucho-related transcriptional corepressors to repress the transcription of Wnt target genes, and, on the other hand, it activates Wnt target genes when Wnt-activated β-catenin interacts with it. However, how its activity is modulated is not well understood. Here we demonstrate that a JmjC-domain containing protein, Jmjd6, interacts with Tcf7l and derepresses Tcf7l. We show that Jmjd6 binds to a region of Tcf7l1 that is also responsible for Groucho interaction, therefore making it possible that Jmjd6 binding displaces the Groucho transcriptional corepressor from Tcf7l1. Moreover, we show that Jmjd6 antagonizes the repression effect of Tcf7l1 on target gene transcription and is able to enhance β-catenin-induced gene activation and that, vice versa, inhibition of Jmjd6 activity compromises gene activation in both cells and Xenopus early embryos. We also show that jmjd6 is both maternally and zygotically transcribed during Xenopus embryogenesis. Loss of Jmjd6 function causes defects in anterioposterior body axis formation and down-regulation of genes that are involved in anterioposterior axis patterning. The results elucidate a novel mechanism underlying the regulation of Tcf7l1 activity and the regulation of embryonic body axis formation.

PubMed ID: 26157142
PMC ID: PMC4536435
Article link: J Biol Chem

Species referenced: Xenopus laevis
Genes referenced: ag1 cer1 chrd ctnnb1 dkk1 foxa4 gsc jmjd6 nodal1 nodal3.1 odc1 otx2 sia1 tbl1x tcf7l1 uqcc6 xpo1
Morpholinos: jmjd6 MO1 tcf7l1 MO2

Phenotypes: Xla Wt + jmjd6 MO (fig.6.d) [+]

Article Images: [+] show captions
References [+] :
Andoniadou, HESX1- and TCF3-mediated repression of Wnt/β-catenin targets is required for normal development of the anterior forebrain. 2011, Pubmed, Xenbase