Abstract
Selection of suitable promoters is crucial for the efficient expression of exogenous genes in transgenic animals. Although one of the most effective promoters, the β-actin promoter, has been widely studied in fish species, it still remains unknown in the economical important African catfish (Clarias gariepinus). In this study, the β-actin promoter of African catfish (cgβ-actinP) was cloned and characterized. In addition, recombinant plasmid pcgβ-actinP-EGFP with enhanced green fluorescent protein (GFP) gene as the reporter gene was constructed to verify the transcriptional activity. We obtained a cgβ-actinP fragment length of 1405 bp, consisting 104 bp of the 5′ proximal promoter, 96 bp of the first exon, and 1205 bp of the first intron. Similar to those of other fish species, cgβ-actinP contains three key transcription regulatory elements (CAAT box, CArG motif, and TATA box). GFP-specific fluorescent signals were detected in chicken embryonic fibroblasts cells (DF-1 cells) transfected with pcgβ-actinP-EGFP, which was approximately 1.11 times of the positive control. In addition, GFP was effectively expressed in zebrafish larvae microinjected with linearized cgβ-actinP-EGFP, with expression rate reaching approximately 49.84%. Our data indicate that cgβ-actinP could be a potential candidate promoter in the practice of constructing “all fish” transgenic fish.
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Abbreviations
- cgβ-actinP :
-
African catfish (Clarias gariepinus) β-actin promoter
- GFP:
-
Green fluorescent protein
- FAO:
-
Food and agriculture organization of the United Nations
- CDS:
-
Coding sequences
- ZFIN:
-
Zebrafish information network
- WT:
-
Wild type
- DF-1 cells:
-
Chicken embryonic fibroblasts cells
- CMV:
-
Cytomegalovirus
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This work was financial supported by National Key R&D Program of China (No. 2018YFD0900603), the Open Project of Key Laboratory of Environmental Biotechnology, CAS (kf2018005), and the Science and Technology Project of Wenzhou (2019ZX002-02).
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SR: Conceptualization, investigation, methodology, writing-original draft. WH: Data curation, investigation. SR: Data curation, investigation. WS: Data curation. YH: Formal analysis, investigation. YT: Formal analysis, investigation. LZ: Formal analysis, investigation. MY: Conceptualization, project administration, supervision, funding acquisition. GL: Conceptualization, project administration, supervision, funding acquisition.
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Ri, S., Hwang, W., Ri, S. et al. Cloning, characterization, and transcriptional activity of β-actin promoter of African catfish (Clarias gariepinus). Mol Biol Rep 48, 2561–2571 (2021). https://doi.org/10.1007/s11033-021-06306-z
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DOI: https://doi.org/10.1007/s11033-021-06306-z