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Characterization of the 16S–23S internal transcribed spacer among 34 higher plants: suitability for interspecific plastid transformation

  • Genetic Transformation and Hybridization
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Abstract

Biomanufacturing by chloroplast transgene expression has the potential to produce significant amounts of biopharmaceuticals, endow plants with novel commercial or humanitarian capabilities, enhance phytoremediation methods and harden plants against adverse environments. Plastid bioengineering exploits the phenomenon of homologous recombination to specifically integrate heterologous sequences into the plastid genome. Previous research suggests the plastid genome 16S–23S internal transcribed spacer provides an advantageous integration site for transgene expression. To characterize the suitability of the 16S–23S region for interspecific recombination, we developed primers against conserved plastid sequences and amplified ∼2.6 kb from 25 plant species. We analyzed the amplicons with nine species from Genbank for homeology, phylogenetic relationships, potential to form chimeric rDNA elements disruptive to translational/replication systems, and the potential number of recombination events for various minimal essential processing segments (MEPS) lengths. Multiple sequence alignment of the 34 species revealed considerable conservation, with identities exceeding 95% among the angiosperms. Substitutions were statistically clustered, generally in noncoding sites, although proposed functional elements such as the OriA region and 3′ terminus of the 16S rRNA exhibited unexpected variation. The nonrandom distribution of substitutions undermines the established, statistical method of estimating the number of recombination initiation sites. This finding is further substantiated by comparing statistical estimates of the number of MEPS sites to a direct count at three different MEPS lengths. We frame this in silico analysis in terms of the potential of the 16S–23S region as a target for interspecific transformation, and describe a ‘primer-to-plastid’ system to rapidly generate species-specific flanking regions for transformation vectors.

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Authors and Affiliations

  1. Department of Clinical Investigation, Madigan Army Medical Center, Fort Lewis, WA, 98327, USA

    Patrick M. McNutt, Mary J. Dehart & Louis A. Matej

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  1. Patrick M. McNutt
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  2. Mary J. Dehart
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  3. Louis A. Matej
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Correspondence to Patrick M. McNutt.

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Communicated by R. Reski

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McNutt, P.M., Dehart, M. & Matej, L.A. Characterization of the 16S–23S internal transcribed spacer among 34 higher plants: suitability for interspecific plastid transformation. Plant Cell Rep 26, 47–60 (2007). https://doi.org/10.1007/s00299-006-0203-9

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