Fisheries and Aquatic Sciences

The Korean Society of Fisheries and Aquatic Science (한국수산과학회)
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Molecular Characterization of Cytoskeletal Beta-Actin and its Promoter in the Javanese Ricefish Oryzias javanicus

  • Lee, Sang Yoon (Department of Marine Bio-Materials and Aquaculture, Pukyong National University) ;
  • Kim, Dong Soo (Department of Marine Bio-Materials and Aquaculture, Pukyong National University) ;
  • Nam, Yoon Kwon (Department of Marine Bio-Materials and Aquaculture, Pukyong National University)
  • Received : 2012.10.30
  • Accepted : 2012.11.15
  • Published : 2012.12.31
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Abstract

We characterized the cytoskeletal beta-actin (${\beta}$-ACT) gene (actb) and its 5'-upstream regulatory region in the Javanese ricefish Oryzias javanicus. The gene and protein structures were deduced from amino acid sequences of the actb gene and conserved in the teleost lineage. The O. javanicus actb gene has common transcription factor binding motifs in its regulatory region found in teleostean orthologues. Following quantitative reverse transcription-PCR, actb gene transcripts were detected in all tissues examined; however, the basal expression levels were different. During early development, O. javanicus actb mRNA levels showed a gradual increase and peaked between late somitogenesis and the heartbeat stage. Microinjection of O. javanicus embryos with the actb gene promoter-driven red fluorescent protein (RFP) gene reporter vector showed a ubiquitous distribution of RFP signals, although most exhibited a mosaic pattern of transgene expression. A small number of microinjected embryos displayed a wide distribution of RFP signals over their entire body, which resembled the expression pattern of endogenous actb. Data from this study provide a basis to develop a transgenic system with ubiquitous expression of foreign genes in O. javanicus.

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References

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