Abstract
The mechanism by which differentiated cells cooperatively express specific sets of genes in multicellular organisms is a fundamental question for biologists. Currently, the mechanism is primarily attributed to complex regulation of transcriptional machinery. Here, I provide a method for studying spatiotemporal characteristics of promoters in vivo by rapid construction of reporter gene-expression vectors based on simple TA-cloning using an in vivo eGFP reporter assay in Medaka (Oryzias latipes). As an application of this method, I focused on the dopa decarboxylase (Ddc) gene, an essential enzyme for production of neurotransmitters, dopamine, and serotonin. Based on the known structure of the Medaka genome, I predicted and cloned the approximately 3 kbp fragment flanking the Ddc gene. Using an eGFP reporter assay in vivo, I showed that it functions as a promoter, directing reporter gene expression in the brain, retina, epiphysis, and gut, but not in sympathetic ganglia, kidney, or liver. Thus, the procedure presented here provides a useful tool for rapid screening of possible promoter regions and for establishing germ line-transmitted transgenic lines of Medaka.
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Abbreviations
- Ddc :
-
Dopa decarboxylase
- Hdc :
-
Histamine decarboxylase
- eGFP :
-
Enhanced green fluorescent protein
- MGD:
-
Medaka genome database
- Dpi:
-
Day(s) post injection
- Dpf:
-
Day(s) post fertilization
- UTR:
-
Untranslated region
- Bp:
-
Base pairs
- CNS:
-
Central nervous system
- PNS:
-
Peripheral nervous system
- β-lac:
-
Beta-lactamase
- PCR:
-
Polymerase chain reaction
- HB:
-
Hybridization buffer
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Acknowledgment
I would like to thank Yuji Ishikawa for providing Hd-rR and Yuko Wakamatsu for providing SeeThrough via the National BioResource Project (http://www.nbrp.jp/). I also thank Yoriko Jyosaki, Takako Iwanaga, and Kaoru Ogata for excellent assistance in maintaining the fish. This work was supported in part by a Grant-in-Aid for Scientific Research from the Japan Society for the Promotion of Science (#18650095, K.E.F).
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Fujimori, K.E. Characterization of the Regulatory Region of the Dopa Decarboxylase Gene in Medaka: An in vivo Green Fluorescent Protein Reporter Assay Combined with a Simple TA-Cloning Method. Mol Biotechnol 41, 224–235 (2009). https://doi.org/10.1007/s12033-008-9120-1
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DOI: https://doi.org/10.1007/s12033-008-9120-1