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Physiological Effects of KDM5C on Neural Crest Migration and Eye

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Physiological Effects of KDM5C on Neural Crest Migration and Eye Kim et al. Epigenetics & Chromatin (2018) 11:72 https://doi.org/10.1186/s13072-018-0241-x Epigenetics & Chromatin RESEARCH Open Access Physiological efects of KDM5C on neural crest migration and eye formation during vertebrate development Youni Kim1†, Youngeun Jeong1†, Kujin Kwon2, Tayaba Ismail1, Hyun‑Kyung Lee1, Chowon Kim1, Jeen‑Woo Park1, Oh‑Shin Kwon1, Beom‑Sik Kang1, Dong‑Seok Lee1, Tae Joo Park2, Taejoon Kwon2* and Hyun‑Shik Lee1* Abstract Background: Lysine-specifc histone demethylase 5C (KDM5C) belongs to the jumonji family of demethylases and is specifc for the di- and tri-demethylation of lysine 4 residues on histone 3 (H3K4 me2/3). KDM5C is expressed in the brain and skeletal muscles of humans and is associated with various biologically signifcant processes. KDM5C is known to be associated with X-linked mental retardation and is also involved in the development of cancer. However, the developmental signifcance of KDM5C has not been explored yet. In the present study, we investigated the physi‑ ological roles of KDM5C during Xenopus laevis embryonic development. Results: Loss-of-function analysis using kdm5c antisense morpholino oligonucleotides indicated that kdm5c knock‑ down led to small-sized heads, reduced cartilage size, and malformed eyes (i.e., small-sized and deformed eyes). Molecular analyses of KDM5C functional roles using whole-mount in situ hybridization, β-galactosidase staining, and reverse transcription-polymerase chain reaction revealed that loss of kdm5c resulted in reduced expression levels of neural crest specifers and genes involved in eye development. Furthermore, transcriptome analysis indicated the signifcance of KDM5C in morphogenesis and organogenesis. Conclusion: Our fndings indicated that KDM5C is associated with embryonic development and provided additional information regarding the complex and dynamic gene network that regulates neural crest formation and eye devel‑ opment. This study emphasizes the functional signifcance of KDM5C in Xenopus embryogenesis; however, further analysis is needed to explore the interactions of KDM5C with specifc developmental genes. Keywords: Histone demethylase, Neural crest development, Eye formation, Embryogenesis, Organogenesis Background for proper development of the organism, such as the neu- Embryonic organ development is a highly organized ral crest [2]. Te neural crest is comprised of stem-like and complex process involving the temporal and spatial cells that are predestined to migrate extensively and dif- expression of genes that control diferentiation, matura- ferentiate into specialized cell types during vertebrate tion, and survival of organs [1]. Additionally, this process embryogenesis [3]. Induction of neural crest cells begins involves the formation and migration of cells that are at the gastrula stage of development. Neural crest pro- destined to diferentiate into specifc structures essential genitors are initially identifed at the edge of the neural plate, forming a bridge between the neural and non-neu- ral portion of the ectoderm, and require tissue interac- *Correspondence: [email protected]; [email protected] tions between the neural plate and ectoderm [4]. Before †Youni Kim and Youngeun Jeong have contributed equally to this work 1 KNU‑Center for Nonlinear Dynamics, CMRI, School of Life Sciences, undergoing migration, neural crest cells are localized BK21 Plus KNU Creative BioResearch Group, College of Natural Sciences, to the dorsal part of the neural tube [5]. Neural crest Kyungpook National University, Daegu 41566, South Korea cells later migrate throughout the body and give rise to 2 School of Life Sciences, Ulsan National Institute of Science and Technology (UNIST), Ulsan 44919, South Korea various types of cells, such as melanocytes, craniofacial © The Author(s) 2018. This article is distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creat​iveco​mmons​.org/licen​ses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The Creative Commons Public Domain Dedication waiver (http://creat​iveco​mmons​.org/ publi​cdoma​in/zero/1.0/) applies to the data made available in this article, unless otherwise stated. Kim et al. Epigenetics & Chromatin (2018) 11:72 Page 2 of 17 cartilage and bone, smooth muscles, and peripheral nerv- knockdown of the kdm5c homologue induces brain-pat- ous cells [6]. terning defects and neuronal cell death, while small inter- Formation and migration of neural crest cells and fering RNA (siRNA)-mediated knockdown of kdm5c in development of diferent organs during vertebrate primary rat granule neurons damaged dendritic morpho- embryogenesis require regulated gene expression [7, 8], genesis [26]. Furthermore, KDM5C has been implicated which is afected by the epigenome [9]. Epigenetic modi- in renal cancer [27]. fcations, such as methylation, phosphorylation, and In the current study, we investigated the functional ubiquitination, play signifcant roles in regulating gene signifcance of KDM5C during Xenopus embryogenesis, expression and interaction to fulfll specifc functions where the spatiotemporal expression of kdm5c indicated [10]; for example, histone lysine methylation leads to the that it is a maternal gene. Loss-of-function studies using activation or suppression of certain genes [11]. Te meth- kdm5c morpholino oligonucleotides (MO) demonstrated ylation status of histones is regulated by several types of the signifcance of this demethylase in neural crest migra- methyltransferases (KMTs) and demethylases (DMTs) tion and eye development. Whole-mount in situ hybridi- [12]; thus far, two groups of histone demethylases impli- zation (WISH) and reverse transcription-polymerase cated in diverse biological functions have been discov- chain reaction (RT-PCR) analyses indicated that kdm5c ered [13, 14]. knockdown led to inhibition of neural crest migration Lysine-specifc histone demethylase 5C (KDM5C; also and defects in eye development. Furthermore, transcrip- known as JARID1C and SMCX) catalyzes the demeth- tome analysis of kdm5c MO-injected embryos showed ylation of lysine 4 on histone 3 (H3K4me3/me2). Since that KDM5C is critical for morphogenesis of anatomical H3K4me3 and H3K4me2 are associated with actively structures and organogenesis during Xenopus embryonic transcribed genes, demethylation of H3K4 by KDM5C development. Collectively, we concluded that KDM5C causes transcriptional repression [15, 16]. In mammalian plays signifcant roles in neural crest migration and eye cells, KDM5C belongs to a protein subfamily consist- formation during vertebrate development. ing of four members, namely KDM5A/retinoblastoma binding protein 2 (RBP2)/JARID1A, KDM5B/PLU-1/ Results JARID1B, KDM5C/SMCX/JARID1C, and KDM5D/ kdm5c is expressed in neural tissues including the neural SMCY/JARID1D [17]. KDM5C contains the catalytic crest and eyes jumonji C (JmjC) and jumonji N (JmjN) domains, which To investigate the specifc roles of KDM5C during are involved in the maintenance of JmjC domain struc- embryogenesis, we frst analyzed its gene expression tural integrity and possess an ARID/BRIGHT DNA bind- pattern in Xenopus. For this purpose, we conducted RT- ing domain [18], a single C5HC2 zinc fnger domain PCR and WISH analyses. RT-PCR revealed that kdm5c located at the C-terminal of the JmjC domain, and two is a maternal gene, as it was found expressed through- plant homeodomains (PHD) that bind to the methyl out embryonic development from the single-cell stage to lysine residue [19]. the tadpole stage (Fig. 1a). Te temporal expression pat- Te kdm5c gene, which is located on the X chromo- tern of kdm5c indicated that this gene possesses essential some, has recently been identifed as the gene responsi- functions during Xenopus development. ble for X-linked mental retardation (XLMR) [20]. XLMR WISH analysis was performed to determine the spatial is a heterogeneous disease that is afected by genetic, expression patterns of kdm5c during Xenopus embry- environmental, and stochastic factors [21]. Notably, onic development at diferent developmental stages (st. kdm5c mutations found in XLMR diminish the ability of 6, 9, 13, 16, 22, 32, and 36; Fig. 1b–k′). Te expression KDM5C to demethylate H3K4, indicating that the dem- pattern of kdm5c indicated that this gene is expressed in ethylation activity of KDM5C is critical for brain devel- the animal hemisphere of developing embryos at devel- opment [21–23]. opmental stage 6 (Fig. 1b). Additionally, kdm5c expres- KDM5C is highly expressed in the brain and skeletal sion was observed in late blastula-stage embryos showing muscle tissue in humans [21], and human KDM5C is enhanced expression in the animal pole (st. 9; Fig. 1c). involved in the inhibition of specifc neuronal genes. In Tissue-specifc expression of kdm5c was observed dur- the mouse brain, kdm5c is widely expressed in regions ing the neurula stage of embryonic development and related to cognitive and emotional behaviors, including was found expressed in the early eye feld region at stage the prefrontal cortex, hippocampus, and amygdala [24]. 13 (Fig. 1d). We also observed kdm5c expression in the kdm5c-knockout mice exhibit abnormal social behavior anterior neural tissues of neurula stage embryos (st. 16; including aggression as well as impaired learning and Fig. 1e) with dorsal expression in the
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