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Vanessa Gerber, Lixin Yang, Masanari Takamiya, Vanessa Ribes, Victor Gourain, Ravindra Peravali, Johannes Stegmaier, Ralf Mikut, Markus Reischl, Marco Ferg, Sepand Rastegar, Uwe Strähle
Specification of neurons in the spinal cord relies on extrinsic and intrinsic signals, which in turn are interpreted by expression of transcription factors. V2 interneurons develop from the ventral aspects of the spinal cord. We report here a novel neuronal V2 subtype, named V2s, in zebrafish embryos. Formation of these neurons depends on the transcription factors sox1a and sox1b. They develop from common gata2a/gata3 dependent precursors co-expressing markers of V2b and V2s interneurons. Chemical blockage of Notch signaling causes a decrease of V2s and an increase of V2b cells...
February 13, 2019: Development
Yi Liu, Muhammad Junaid, Yan Wang, Yu-Mei Tang, Wan-Ping Bian, Wen-Xu Xiong, Hai-Yang Huang, Chun-Di Chen, De-Sheng Pei
Tetracycline hydrochloride (TH), indomethacin (IM), and bezafibrate (BF) belong to the three different important classes of pharmaceuticals, which are well known for their toxicity and environmental concerns. However, studies are still elusive to highlight the mechanistic toxicity of these pharmaceuticals and rank them using both, the toxicity prediction and confirmation approaches. Therefore, we employed the next generation toxicity testing in 21st century (TOX21) tools and estimated the in vitro/vivo toxic endpoints of mentioned pharmaceuticals, and then confirmed them using in vitro/vivo assays...
August 2018: Aquatic Toxicology
Livia A Andrzejczuk, Santanu Banerjee, Samantha J England, Christiane Voufo, Kadiah Kamara, Katharine E Lewis
Vertebrate locomotor circuitry contains distinct classes of ventral spinal cord neurons which each have particular functional properties. While we know some of the genes expressed by each of these cell types, we do not yet know how several of these neurons are specified. Here, we investigate the functions of Tal1, Gata2a, and Gata3 transcription factors in the development of two of these populations of neurons with important roles in locomotor circuitry: V2b neurons and cerebrospinal fluid-contacting Kolmer-Agduhr (KA) neurons (also called CSF-cNs)...
2018: Frontiers in Neuroscience
Jinxiang Liu, Jiajun Jiang, Zhongkai Wang, Yan He, Quanqi Zhang
Background. Following the two rounds of whole-genome duplication that occurred during deuterostome evolution, a third genome duplication occurred in the lineage of teleost fish and is considered to be responsible for much of the biological diversification within the lineage. GATA2, a member of GATA family of transcription factors, is an important regulator of gene expression in hematopoietic cell in mammals, yet the role of this gene or its putative paralogs in ray-finned fishes remains relatively unknown. Methods...
2016: PeerJ
Emerald Butko, Martin Distel, Claire Pouget, Bart Weijts, Isao Kobayashi, Kevin Ng, Christian Mosimann, Fabienne E Poulain, Adam McPherson, Chih-Wen Ni, David L Stachura, Natasha Del Cid, Raquel Espín-Palazón, Nathan D Lawson, Richard Dorsky, Wilson K Clements, David Traver
The adult blood system is established by hematopoietic stem cells (HSCs), which arise during development from an endothelial-to-hematopoietic transition of cells comprising the floor of the dorsal aorta. Expression of aortic runx1 has served as an early marker of HSC commitment in the zebrafish embryo, but recent studies have suggested that HSC specification begins during the convergence of posterior lateral plate mesoderm (PLM), well before aorta formation and runx1 transcription. Further understanding of the earliest stages of HSC specification necessitates an earlier marker of hemogenic endothelium...
March 15, 2015: Development
Zhidan Xia, Xiangjun Tong, Fang Liang, Yihan Zhang, Chikin Kuok, Yingla Zhang, Xinxing Liu, Zuoyan Zhu, Shuo Lin, Bo Zhang
Congenital diseases caused by abnormal development of the cranial neural crest usually present craniofacial malformations and heart defects while the precise mechanism is not fully understood. Here, we show that the zebrafish eif3ba mutant caused by pseudo-typed retrovirus insertion exhibited a similar phenotype due to the hypogenesis of cranial neural crest cells (NCCs). The derivatives of cranial NCCs, including the NCC-derived cell population of pharyngeal arches, craniofacial cartilage, pigment cells and the myocardium derived from cardiac NCCs, were affected in this mutant...
September 1, 2013: Developmental Biology
Peng Huang, Linjie Xu, Wei Liang, Chi Ian Tam, Yutian Zhang, Fei Qi, Zuoyan Zhu, Shuo Lin, Bo Zhang
Genomic deletions induced by imprecise excision of transposons have been used to disrupt gene functions in Drosophila. To determine the excision properties of Tol2, a popular transposon in zebrafish, we took advantage of two transgenic zebrafish lines Et(gata2a:EGFP)pku684 and Et(gata2a:EGFP)pku760, and mobilized the transposon by injecting transposase mRNA into homozygous transgenic embryos. Footprint analysis showed that the Tol2 transposons were excised in either a precise or an imprecise manner. Furthermore, we identified 1093-bp and 1253-bp genomic deletions in Et(gata2a:EGFP)pku684 founder embryos flanking the 5' end of the original Tol2 insertion site, and a 1340-bp deletion in the Et(gata2a:EGFP)pku760 founder embryos flanking the 3' end of the insertion site...
January 2013: Nucleic Acids Research
Yobhana Quiroz, Mauricio Lopez, Anastasia Mavropoulos, Patrick Motte, Joseph A Martial, Matthias Hammerschmidt, Marc Muller
The pituitary is a complex gland comprising different cell types each secreting specific hormones. The extensive network of signaling molecules and transcription factors required for determination and terminal differentiation of specific cell types is still not fully understood. The SRY-like HMG-box (SOX) transcription factor Sox4 plays important roles in many developmental processes and has two homologs in zebrafish, Sox4a and Sox4b. We show that the sox4b gene is expressed in the pituitary anlagen starting at 24 h after fertilization (hpf) and later in the entire head region including the pituitary...
June 2012: Molecular Endocrinology
Cong Zhu, Tom Smith, Joseph McNulty, Amy L Rayla, Abirami Lakshmanan, Arndt F Siekmann, Matthew Buffardi, Xiangdong Meng, Jimann Shin, Arun Padmanabhan, Daniel Cifuentes, Antonio J Giraldez, A Thomas Look, Jonathan A Epstein, Nathan D Lawson, Scot A Wolfe
Zinc-finger nucleases (ZFNs) allow targeted gene inactivation in a wide range of model organisms. However, construction of target-specific ZFNs is technically challenging. Here, we evaluate a straightforward modular assembly-based approach for ZFN construction and gene inactivation in zebrafish. From an archive of 27 different zinc-finger modules, we assembled more than 70 different zinc-finger cassettes and evaluated their specificity using a bacterial one-hybrid assay. In parallel, we constructed ZFNs from these cassettes and tested their ability to induce lesions in zebrafish embryos...
October 2011: Development
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