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First published online 22 April 2008
doi: 10.1242/jcs.023119

Journal of Cell Science 121, 1613-1623 (2008)
Published by The Company of Biologists 2008
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Research Article

Zfp64 participates in Notch signaling and regulates differentiation in mesenchymal cells

Kei Sakamoto*, Yoshihiro Tamamura, Ken-ichi Katsube and Akira Yamaguchi

Section of Oral Pathology, Graduate School, Tokyo Medical and Dental University, 1-5-45 Yushima, Bunkyo-ku, Tokyo 113-8549, Japan

* Author for correspondence (e-mail: s-kei.mpa{at}tmd.ac.jp)

Accepted 1 March 2008

Notch signaling is required for multiple aspects of tissue and cell differentiation. In this study, we identified zinc finger protein 64 (Zfp64) as a novel coactivator of Notch1. Zfp64 is associated with the intracellular domain of Notch1, recruited to the promoters of the Notch target genes Hes1 and Hey1, and transactivates them. Zfp64 expression is under the control of Runx2, and is upregulated by direct transactivation of its promoter. Zfp64 suppresses the myogenic differentiation of C2C12 cells and promotes their osteoblastic differentiation. Our data demonstrate two functions of Zfp64: (1) it is a downstream target of Runx2 and, (2) its cognate protein acts as a coactivator of Notch1, which suggests that Zfp64 mediates mesenchymal cell differentiation by modulating Notch signaling.

Key words: Notch, Runx2, Zinc finger protein 64


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