Related Experiment Video
Updated: Nov 30, 2025
Generation of Maternal Mutants Using zpc:cas9 Knock-in Zebrafish
Published on: July 22, 2025
CRISPR/Cas9-induced nos2b mutant zebrafish display behavioral abnormalities
Lei Gao1, Rachit Penglee1, Yajuan Huang1
1Key Laboratory of Exploration and Utilization of Aquatic Genetic Resources (Shanghai Ocean University), Ministry of Education, International Research Center for Marine Biosciences at Shanghai Ocean University, Ministry of Science and Technology, National Demonstration Center for Experimental Fisheries Science Education, Shanghai Ocean University, Shanghai, China.
Zebrafish lacking the nitric oxide synthase 2B (NOS2B) gene show increased motor activity and altered brain development. This study explores the molecular basis of these behavioral changes in nos2b knockout zebrafish.
Area of Science:
- Neuroscience
- Genetics
- Molecular Biology
Background:
- The immunomodulatory role of nitric oxide synthase 2 (NOS2) is well-established.
- Limited research suggests potential links between NOS2 mutations and behavioral abnormalities, with underlying mechanisms unclear.
Purpose of the Study:
- To investigate the behavioral and molecular consequences of nos2b gene knockout in zebrafish.
- To elucidate the role of NOS2B in neurodevelopment and behavioral regulation.
Main Methods:
- Generation of nos2b gene knockout zebrafish (nos2bsou2/sou2) using CRISPR/Cas9.
- Comprehensive behavioral assessments, morphological measurements, and molecular analyses (mRNA levels).
Main Results:
- Nos2b knockout zebrafish exhibited significantly enhanced motor activity compared to wild-type.
- These zebrafish displayed smaller brain size, abnormal optic tectum structure, and reduced mRNA levels of synaptophysin and homer1.
- Altered responses to sodium nitroprusside and methylphenidate hydrochloride treatments were observed.
Conclusions:
- The nos2b gene plays a crucial role in regulating motor activity and brain development in zebrafish.
- Disruption of NOS2B impacts synaptic protein expression and neurochemical responses.
- These findings provide insights into the molecular mechanisms underlying behavioral regulation and potential neurological disorders.
