Abstract
The sphk1 gene plays a crucial role in cell growth and signal transduction. However, the developmental functions of the sphk1 gene during early vertebrate zebrafish embryo remain not completely understood. In this study, we constructed zebrafish sphk1 mutants through CRISPR/Cas9 to investigate its role in zebrafish embryonic development. Knockout of the sphk1 gene was found to cause abnormal development in zebrafish embryos, such as darkening and atrophy of the head, trunk deformities, pericardial edema, retarded yolk sac development, reduced heart rate, and premature death. The acetylcholinesterase activity was significantly increased after the knockout of sphk1, and some of the neurodevelopmental genes and neurotransmission system–related genes were expressed abnormally. The deletion of sphk1 led to abnormal expression of immune genes, as well as a significant decrease in the number of hematopoietic stem cells and neutrophils. The mRNA levels of cardiac development–related genes were significantly decreased. In addition, cell apoptosis increases in the sphk1 mutants, and the proliferation of head cells decreases. Therefore, our study has shown that the sphk1 is a key gene for zebrafish embryonic survival and regulation of organ development. It deepened our understanding of its physiological function. Our study lays the foundation for investigating the mechanism of the sphk1 gene in early zebrafish embryonic development.
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Funding
This work was supported by the National Natural Science Foundation (31900597, 81860282, 32072969), the Jiangxi Province’s major academic and technical leaders training plan for young talents (20204BCJL23043), the Jiangxi Natural Science Foundation for Distinguished Young Scholars (20224ACB215001), and the Jiangxi Provincial Department of Education Science and Technology Program Project (GJJ211004).
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Zigang Cao, Wanbo Li and Ling Huang designed the experiments; Zigang Cao and Wanbo Li supervised the study; Ling Huang performed all of experiments; Ling Huang, Wanbo Li, Fang Han and Ying Huang wrote the first draft of the manuscript; Ling Huang, Jieping Liu and Xinjun Liao analyzed data. All authors read and approved the final manuscript.
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All experimental procedures on zebrafish were performed according to the guiding principles for the care and use of laboratory animals and were approved by the Independent Animal Care Committee (IACC) of Jinggangshan University.
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Huang, L., Han, F., Huang, Y. et al. Sphk1 deficiency induces apoptosis and developmental defects and premature death in zebrafish. Fish Physiol Biochem 49, 737–750 (2023). https://doi.org/10.1007/s10695-023-01215-3
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DOI: https://doi.org/10.1007/s10695-023-01215-3