Abstract
Tripartite motif 33 (TRIM33), a member of the transcription intermediate factor 1 (TIF1) family of transcription cofactors, mediates transforming growth factor-beta (TGF-β) signaling through its PHD-Bromo cassette in mesendoderm differentiation during early mouse embryonic development. However, the role of the TRIM33 RING domain in embryonic differentiation is less clear. Here, we report that TRIM33 mediates Wnt signaling by directly regulating the expression of a specific subset of Wnt target genes, and this action is independent of its RING domain. We show that TRIM33 interacts with β-catenin, a central player in Wnt signaling in mouse embryonic stem cells (mESCs). In contrast to previous reports in cancer cell lines, the RING domain does not appear to function as the E3 ligase for β-catenin, since neither knockout nor overexpression of TRIM33 had an effect on β-catenin protein levels in mESCs. Furthermore, we show that although TRIM33 seems to be dispensable for Wnt signaling through a reporter assay, loss of TRIM33 significantly impairs the expression of a subset of Wnt target genes, including Mixl1, in a Wnt signaling-dependent manner. Together, our results indicate that TRIM33 regulates Wnt signaling independent of the E3 ligase activity of its RING domain for β-catenin in mESCs.
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Acknowledgements
We thank Professor Wei Wu (Tsinghua University) for providing the 7xTcf-eGFP/SV40-mCherry plasmid. We also thank Professor Ye-Guang Chen (Tsinghua University) for providing the TOP-FLASH luciferase reporter, FOP-FLASH luciferase reporter, pRL-TK Renilla reporter, and luciferase reagent. This work was supported by the National Natural Science Foundation of China (20141300584, 20151301548 to Qiaoran Xi), and the THU-PKU Center for Life Sciences.
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Xia, X., Zuo, F., Luo, M. et al. Role of TRIM33 in Wnt signaling during mesendoderm differentiation. Sci. China Life Sci. 60, 1142–1149 (2017). https://doi.org/10.1007/s11427-017-9129-3
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DOI: https://doi.org/10.1007/s11427-017-9129-3