Abstract
Tissue-specific expression of recombinant proteins in transgenic plants is of particular importance. Production of tissue-specific transplastomic plants is challenging due to lack of tissue-specific promoter in the plastome. The objective of the present study was to produce a transgenic platform enhancing tissue-specific transgene expression in the green organs of Nicotiana tabacum Cv. Jafarabadi. A bacteria/plant hybrid sigma factor sequence (hsig) under control of the PEP Carboxylase promoter (PEPC) was designed and cloned in a plasmid construct without selectable marker gene and finally transformed into the nucleus genome by Agrobacterium. Transformation was confirmed by PCR, RT-PCR, southern blot and real-time PCR analysis. The resulted platform was re-transformed using a plastid construct pFNGi containing gfp (reporter gene) and neo genes (a kanamycin resistance selectable marker gene). Expression of GFP was assayed under Epifluorescence microscopy. The results showed that the constructed platform was functional, and the GFP was expressed. Finally, it can be concluded that application of the hybrid sigma factor (hsig) under control of a tissue-specific promoter could be a suitable platform for tissue-specific expression of plastome integrated transgenes, and also it is proposed to use other more safer marker genes for plastid transformation instead of the antibiotic resistance gene.
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Abbreviations
- FR:
-
Flanking region
- PEP:
-
Plastid-encoded RNA polymerase
- PMF:
-
Plant molecular farming
- Sig:
-
Sigma factor
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Acknowledgment
This project was financially supported by Agricultural Biotechnology Research Institute of Iran (ABRII). We would like to thank all our colleagues in the Tissue Culture and Gene Transformation Department of ABRII for their kind support and assistance during the course of this investigation.
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Mohsenpour, M., Tohidfar, M., Jelodar, N.B. et al. Designing a new marker-free and tissue-specific platform for molecular farming applications. J. Plant Biochem. Biotechnol. 24, 433–440 (2015). https://doi.org/10.1007/s13562-014-0294-2
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DOI: https://doi.org/10.1007/s13562-014-0294-2