Mol. Cells 2017; 40(12): 945~953  https://doi.org/10.14348/molcells.2017.0216
Rnf152 Is Essential for NeuroD Expression and Delta-Notch Signaling in the Zebrafish Embryos
Ajeet Kumar1, Tae-Lin Huh2, Joonho Choe3, and Myungchull Rhee1,*
1Department of Life Science, BK21 Plus Program, Graduate School, Chungnam National University, Daejeon 34134, Korea,
2School of Life Sciences and Biotechnology, College of Natural Sciences, Kyungpook National University, Daegu 41566, Korea,
3Department of Biological Sciences, Korea Advanced Institute of Science and Technology, Daejeon 34141, Korea
*Correspondence: mrhee@cnu.ac.kr
Received September 18, 2017; Revised November 24, 2017; Accepted November 24, 2017.; Published online December 22, 2017.
© Korean Society for Molecular and Cellular Biology. All rights reserved.

This is an open-access article distributed under the terms of the Creative Commons Attribution-NonCommercial-ShareAlike 3.0 Unported License. To view a copy of this license, visit (http://creativecommons.org/licenses/by-nc-sa/3.0/).
ABSTRACT
We report the biological functions of a zebrafish homologue of RING-finger protein 152 (rnf152) during embryogenesis. rnf152 was initially identified as a brain-enriched E3 ligase involved in early embryogenesis of zebrafish. Expression of rnf152 was ubiquitous in the brain at 24 hpf but restricted to the eyes, midbrain-hindbrain boundary (MHB), and rhombomeres at 48 hpf. Knockdown of rnf152 in zebrafish embryos caused defects in the eyes, MHB, and rhombomeres (r1–7) at 24 hpf. These defects in rnf152-deficient embryos were analyzed by whole-mount in situ hybridization (WISH) using neuroD, deltaD, notch1a, and notch3 probes. NeuroD expression was abolished in the marginal zone, outer nuclear layer (ONL), inner nuclear layer (INL), and ganglion cell layer (GCL) of the eyes at 27 hpf. Furthermore, deltaD and notch1a expression was remarkably reduced in the ONL, INL, subpallium, tectum, cerebellum, and rhombomeres (r1-7) at 24 hpf, whereas notch3 expression was reduced in the tectum, cerebellum, and rhombomeres at 24 hpf. Finally, we confirmed that expression of Notch target genes, her4 and ascl1a, also decreased significantly in these areas at 24 hpf. Thus, we propose that Rnf152 is essential for development of the eyes, midbrain and hindbrain, and that Delta-Notch signaling is involved.
Keywords: delta-notch signaling, neurogenesis, neuroD, rnf152, zebrafish embryo


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