WO2004029256A2 - Vector para la producción de plantas angiospermas transplastómicas - Google Patents
Vector para la producción de plantas angiospermas transplastómicas Download PDFInfo
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- WO2004029256A2 WO2004029256A2 PCT/CU2003/000009 CU0300009W WO2004029256A2 WO 2004029256 A2 WO2004029256 A2 WO 2004029256A2 CU 0300009 W CU0300009 W CU 0300009W WO 2004029256 A2 WO2004029256 A2 WO 2004029256A2
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- dna vector
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Classifications
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- C—CHEMISTRY; METALLURGY
- C12—BIOCHEMISTRY; BEER; SPIRITS; WINE; VINEGAR; MICROBIOLOGY; ENZYMOLOGY; MUTATION OR GENETIC ENGINEERING
- C12N—MICROORGANISMS OR ENZYMES; COMPOSITIONS THEREOF; PROPAGATING, PRESERVING, OR MAINTAINING MICROORGANISMS; MUTATION OR GENETIC ENGINEERING; CULTURE MEDIA
- C12N15/00—Mutation or genetic engineering; DNA or RNA concerning genetic engineering, vectors, e.g. plasmids, or their isolation, preparation or purification; Use of hosts therefor
- C12N15/09—Recombinant DNA-technology
- C12N15/63—Introduction of foreign genetic material using vectors; Vectors; Use of hosts therefor; Regulation of expression
- C12N15/79—Vectors or expression systems specially adapted for eukaryotic hosts
- C12N15/82—Vectors or expression systems specially adapted for eukaryotic hosts for plant cells, e.g. plant artificial chromosomes (PACs)
- C12N15/8201—Methods for introducing genetic material into plant cells, e.g. DNA, RNA, stable or transient incorporation, tissue culture methods adapted for transformation
- C12N15/8214—Plastid transformation
-
- C—CHEMISTRY; METALLURGY
- C12—BIOCHEMISTRY; BEER; SPIRITS; WINE; VINEGAR; MICROBIOLOGY; ENZYMOLOGY; MUTATION OR GENETIC ENGINEERING
- C12N—MICROORGANISMS OR ENZYMES; COMPOSITIONS THEREOF; PROPAGATING, PRESERVING, OR MAINTAINING MICROORGANISMS; MUTATION OR GENETIC ENGINEERING; CULTURE MEDIA
- C12N15/00—Mutation or genetic engineering; DNA or RNA concerning genetic engineering, vectors, e.g. plasmids, or their isolation, preparation or purification; Use of hosts therefor
- C12N15/09—Recombinant DNA-technology
- C12N15/63—Introduction of foreign genetic material using vectors; Vectors; Use of hosts therefor; Regulation of expression
- C12N15/79—Vectors or expression systems specially adapted for eukaryotic hosts
- C12N15/82—Vectors or expression systems specially adapted for eukaryotic hosts for plant cells, e.g. plant artificial chromosomes (PACs)
Definitions
- This invention relates to the branch of Biotechnology and more specifically to Plant Genetic Engineering.
- useful DNA constructs are provided to introduce high efficiency and express foreign genes in plastids of Angiosperm plants and demonstrate their usefulness in obtaining high efficiency transplastomic plants that express heterologous proteins, in particular vaccine antigens and proteins.
- Plant genetic engineering is a technology that has proven very productive for basic research and commercial production of new biotechnological products (see: Hammond J. Curr. Top. Microbiol. Immunol 1999, 240: 1-19; Simoens C and Van Montagu M. Reproduction Update 1995, 1: 523-542).
- heterologous genes in plastids has the following advantages over their nuclear counterpart: 1) a level of transgene expression 10 to 50 times higher than in the nucleus given the high number of copies of each genome per plastidium; 2) the insertion of the new genes can be site specific by homologous recombination avoiding the effects of position, silencing and other phenomena that influence the expression of the genes introduced to the cell nucleus; 3) gene expression in operons is possible, which is very desirable when it comes to engineering the metabolic pathways or altering characters that are multigenic; 4) the heritability of the genetic information is maternal, so it is avoided that through the pollen the new introduced characters are dispersed in the environment, thus eliminating possible damages to the environment. Additionally, the expression of genes in plastids offers the possibility of accumulating heterologous proteins there that in that microenvironment could have greater stability, or from which they could be more easily purified.
- the region of the plastid genome that is most universally conserved in terms of structure and nucleotide sequence between Angiosperm plants is that of the operons that are transcribed in opposite directions atpB and rbcL.
- these genes contain DNA segments greater than 1500 base pairs (bp) with homologies greater than 85% between plastids of plants belonging to different classes (dicotyledonous or monocotyledonous) and more than 91% nucleotide homology when analyzing plants of the same class (see Table 1).
- the intergenic region between these two operons has a very low nucleotide level homology (less than 50%) between the plastids of dicotyledonous and monocotyledonous plants.
- Table 1 Homology at the nucleotide level between the rbcL and atpB genes of plants of different species and classes.
- the major subunit of the ribulose 1,5 bisphosphate carboxylase-oxygenase (Rubisco) is encoded by the plastics gene rbcL.
- rbcL The major subunit of the ribulose 1,5 bisphosphate carboxylase-oxygenase (Rubisco) is encoded by the plastics gene rbcL.
- rbcS nuclear gene rbcS
- the Prrn promoter is constitutive, while the translational transcription of the RNAs produced by the PsbA promoter is induced by light and depends on its 5 'non-translatable region.
- the deletion of the region 5 'non-translatable psbA gene makes the expression of its mRNA independent of light, however its translation is affected (Staub JM and Maliga P. Plant J. 1994, 6: 547-553; Eibi C; Zou Z ; Beck A; et al. Plant J. 1999, 19: 333-345).
- promoters have sequences -35 and -10 homologous to the consensus described for bacterial promoters and are transcribed dependent on a polymerase encoded by the plastid genome (PEP) (Hess W. and Borner T. Int. Rev. Cytol. 1999, 190 : 1-59).
- PEP plastid genome
- kanamycin Daniell H. Methods in Molecular Biology 1997, 62: 463-489
- spectinomycin Svab Z; Hajdukiewicz P; Maliga P. Proc. Nati. Acad. Sci. USA 1990, 87: 8526-8530; Svab Z. and Maliga P. Proc. Nati. Acad. Sci. USA 1993, 90: 913 -917
- the gene that confers resistance to the selection compound is cloned in the transformation vector under appropriate signals for its correct expression in the plastids.
- the vector for the stable transformation and expression of heterologous genes in plastids of Angiosperm plants proposed by the present invention contains a group of its own characteristics that distinguish it: 1) a transposon is not used to insert DNA fragments into the plastid genome; 2) the atpB and rbcL edge regions belong to Angiosperm plants of different kinds forming an artificial intergenic region; 3) multiple cloning sites in the transcriptionally inactive artificial intergenic region, allow the insertion of one or more heterologous genes without affecting the correct transcription, mRNA processing and expression of the atpB and rbcL genes; 4) the design of our vector allows the expression of the introduced genes without the need for carrying promoter or terminator sequences, as long as the coding sequences for proteins are preceded by a ribosome binding site (this helps to reduce undesirable recombination events and to a saving of metabolic resources of plastids, allowing greater stability of the heterologous DNA fragment and an increase in the frequency of production of homoplasmic plants);
- the design and extension of the atpB-rbcL region, with its artificial intergenic region forms the basis of the present object of the invention because it allows us to efficiently and stably insert genes and operons into the genome of the plastids of Angiosperm plants of any species , without causing any functional alteration.
- the artificial intergenic region the challenge of being able to introduce a foreign gene into it, without affecting the interaction between rbcL and atpB promoters, and their natural transcription rates, had to be solved.
- the rbcL border must comprise a DNA fragment carrying part of the gene and its entire non-transcribable 5'regulatory region.
- This fragment includes: 1) the rbcL PEP (polymerase-encoded polymerase-dependent) promoter with the associated CDF sequences; 2) the 5 'non-translatable region of the rbcL gene and 3) the coding sequence for rbcL to the region corresponding to the N-terminal of the alpha-helix 8.
- the rbcL edge in the vector object of this invention it will extend from position -291 of the nucleotide sequence that codes for this protein in tobacco, to position +1233 (Trp-411 in the amino acid sequence) from the translation start codon of this gene.
- a DNA fragment that includes: 1) the adjacent rbcL promoter and the loop-like sequences close to the beginning of transcription that stabilize the transcripts produced by this promoter; 2) atpB promoters including its NEP promoter; 3) the 5 'non-translatable region of the atpB gene and 4) the coding sequence for atpB up to about 300 bp before the stop codon of this gene.
- the atpB edge extends from position -654 of the nucleotide sequence encoding this protein in rice, to position +1211 from the translation start codon of this gen.
- the rbcL promoter that contains the edge-atpB allows a gene of interest to be expressed with stability in the opposite direction to the transcription of atpB-atpE.
- a genetic cassette containing one or more foreign genes could be cloned under a functional promoter in plastids, and in this way we would obtain their expression enhanced by transcription from two promoters in tandem.
- the construction described above is the basis of the vector object of this invention, where it will also be introduced into the MCSl, in the 5'-3 'direction from the rbcL promoter of the border-atpB, a gene that codes for a marker that allows selection positive of the transformed cells, bordered by repeated DNA sequences that will facilitate by homologous recombination the elimination of the marker once the homoplasmic transplastomic plants are obtained, if this were desired.
- Termination of transcription of the marker gene, or of any other gene that is inserted into the MCSl, will be given by a bacterial terminator that is placed adjacent to the 5 'end of the rbcL edge (preferably the bidirectional terminator rrnBTlT2 of the rrnB operon .coli (Brosius J; Dull TJ; Sleeter DD; Noller HFJ Mol. Biol. 1981, 148: 107-127) preventing transcriptional activity of the inserted fragment interferes with the normal functioning of the natural promoter of this edge.
- Figure 1-B the general structure of the vector object of this invention is shown in Figure 1-B, where the gene, or genes, of interest can be cloned under the rbcL promoter of the edge-atpB forming a mono or polycistronic transcriptional unit (Figure 1-C), or under other functional promoters in plastids being able to obtain, for example, a polycistronic unit under two tandem promoters ( Figure 1-D), or two independent transcriptional units under different combinations of promoter regions ( Figures-E and Figure 1-F).
- Figure 1-C mono or polycistronic transcriptional unit
- Figure 1-D polycistronic unit under two tandem promoters
- Figures-E and Figure 1-F two independent transcriptional units under different combinations of promoter regions
- hygromycin As a selection marker, since although this antibiotic is extremely toxic to dicotyledonous plants such as tobacco, and therefore should be used sparingly, it is much more effective as a selective agent for obtaining monocot plants with genetically modified plastids. Therefore, the hgh gene coding for resistance to hygromycin-B in Klebsiella (Gritz L. and Davies J. Gene 1983, 25: 179-188), containing a suitable Shine-Dalgarno region, is cloned into the low MCSl the rbcL edge-atpB promoter ( Figure 1-B).
- the marker gene was introduced bordered by two repeated DNA sequences that allow its elimination by homologous recombination ( Figure 1-B), once the transplastomic plants are obtained removes the selective agent from the culture medium.
- the repeated sequences we use in our construction are from the region that codes for the p0 p0 slO protein (Dunn JJ and Studier FWJ Mol. Biol. 1983, 166: 477-535).
- Our vectors have the particularity that by eliminating only the marker gene, the rest of the regulatory sequences of its operon remain unchanged ( Figures 1-C, 1-D, 1-E and 1-F); Thus, any gene transcriptionally fused to the marker gene will continue its expression unchanged, saving the resources of the vector.
- This architecture is another of the quantities that distinguish the vector object of this invention from other systems described as vehicles for the genetic modification of plastids. It is obvious that other genes that confer resistance to antibiotics such as spectinomycin (Chinault AC; Blaskeley V. A; Roessler E; Willis DG; et al. Plasmid 1986, 15: 119-131), or sulfonamides (Guerineau F; Mullineaux P. Nucleic Acid Res 1989, 17: 4370), could also be used to facilitate the selection of transplastomic plants. In the same way, genes that confer resistance to herbicidal compounds such as glyphosate (Shah DM; Horsc RB; Klee HJ; Kishore GM; and others.
- Figure 1 A, base structure for the construction of the vector object of the present invention showing the region containing sites for cloning (MCSl ) bounded by: the edge-atpB £ J
- rbcLpr- promoter of the rbcL gene general structure of the vector object of the present invention (rbcLpr- promoter of the rbcL gene, atpBpr- promoter of the aipB gene, Transcription terminator of non-plastid origin, Marker-selection marker gene, Rl, R2- repeated sequences which allow to ehminar the marker gene by homologous recombination).
- C, D, E, F variants of the vector object of the present invention showing the possibilities of expressing one or more genes of interest (gen, geni, gen2) as units monocistronic (E, F) bicistronic (C, E, F) or tricistronic (D), under one (C, E, F) or more
- Figure 2 Vector map for transformation of plastids of Angiosperm plants pNTPA-f.
- Figure 3 Vector map for transformation of plastids of Angiosperm plants
- FIG. 1 Map of the intermediate vector for gene expression in pNTEP plastids.
- FIG. 1 Southern blot of 10 ⁇ g of AD ⁇ of purified chloroplasts by sucrose gradient, digested with Pst I and using the 32 'fragment of the rbcL gene as a 32 P labeled probe.
- Lane-1 unprocessed plant
- lanes-2 to 6 transformed plants (it can be seen that they are all homoplasmic)
- lanes 7 and 8 transformed plants grown in the absence of the selection agent during the last in vitro culture cycle (note that in the first of them the total elimination of the marker gene by recombination has not yet occurred).
- Lane-1 unprocessed plant
- lanes 2-5 transplastomic plants expressing HBsAg (note the signal revealed by the hepatitis B virus antibody at the expected height of approximately 25 KDa).
- FIG. 7 Western blot demonstration of the use of our transformation vectors for plastid expression of the protein chains that make up a monoclonal antibody. 10 ⁇ g of total leaf proteins were analyzed in each run. Lane-1: unprocessed plant; lanes 2-5: transplastomic plants expressing the recombinant CB-Hep.l antibody (note the signals corresponding to the heavy (50 KDa) and light (25 KDa) chains of the immunoglobulin).
- Example No.1 Construction of vectors for stable transformation and expression of heterologous genes in plastids of Angiosperm plants. a) Obtaining the rbcL edge. The rbcL-edge fragment was constructed as follows: using the oligonucleotides described in sequences No.ly No.2, a 1524 bp DNA fragment corresponding to the gene encoding tobacco RBCL was amplified by chain reaction of polymerase (PCR). Purified DNA from leaf chloroplasts of N. tabacum var. SR1.
- the amplified DNA fragment was cloned into the pBluescript II SK vector (Stratagene, USA), previously digested with the restriction enzymes EcoRN and Spel / Klenow, obtaining the clones pBSrbcL.
- pBSrbcL The amplified DNA fragment was cloned into the pBluescript II SK vector (Stratagene, USA), previously digested with the restriction enzymes EcoRN and Spel / Klenow, obtaining the clones pBSrbcL.
- Several of the positive clones were subjected to automatic AD ⁇ sequencing, and it was shown that despite using a high fidelity polymerase when performing the PCR (Pfu AD ⁇ Polymerase, Promega, USA) all clones had mutations.
- clone pBSrbcL13 (containing a mutation in the SacII-BamHI fragment of the rbcL gene) was digested with the restriction enzymes ⁇ col and EcoRI, which cut the rbcL sequence at positions -162 and -29, and this fragment of the rbcL gene was replaced by a synthetic AD ⁇ fragment with the -124 to -97 region altered so that it formed an "ideal" binding site of the lac repressor (Sequence ⁇ o.3).
- the mutation present in the rbcL13 clone was ehminated by replacing the SacII-BamHI fragment of pBR322rbcL13lacOp with a Mutant-free SacII-BamHI fragment obtained from another sequenced pBSrbcL clone.
- a Mutant-free SacII-BamHI fragment obtained from another sequenced pBSrbcL clone.
- the edge-atpB fragment was constructed as follows: using the ohgonucleotides described in the laso.5 and ⁇ o.6 sequences, a 1754 bp AD ⁇ fragment corresponding to the gene encoding the rice ATPB was amplified by reaction in polymerase chain (PCR). For the PCR, purified AD ⁇ of leaf chloroplasts of Oriza sativa var. IAC-18.
- the amplified AD ⁇ fragment was cloned into the pBluescript vector II KS (Stratagene, USA), previously digested with the restriction enzyme HincII, (towards the 5 'region of the cloned fragment the HincII site (SalI) is restored) obtaining the clones pBSatpB.
- HincII restriction enzyme
- SalI HincII site
- Several of the positive clones were subjected to automatic DNA sequencing, selecting a completely correct clone. Through HindIII-SalI digestion (the original sequence is restored and the Sal ⁇ site is lost) and ligation, a synthetic DNA fragment carrying additional restriction sites and part of the region was added to the 5 'region of the selected clone of atpB.
- the approximately 1Kb DNA fragment containing the gene that codes for hygromycin resistance (hgh) was obtained from pBSBar plasmid, by PCR amplification using the ohgonucleotides described in sequences No.9 and No.10, which incorporate a Shine-Dalgarno type region 7 bp before the start of translation and restriction sites to facilitate the manipulation of this fragment.
- the amplified DNA was digested with Kpnl and cloned into the pUC19 vector previously digested with Smal (the S al site is preserved after ligation) and Kpnl, to give rise to the pUC19Hyg plasmid.
- the pET3xb vector was initially digested with BamHI-Ndel, and the 780pb fragment obtained was re-digested with Taql / Klenow and Kpnl so that a DNA fragment of approximately 3 lOpb was obtained that we cloned into the pUC19 vector previously digested with Smal and Kpnl, to obtain the plasmid pUC-Spacer.
- the slO gene fragment cloned into the pUC-Spacer was cleaved by digestion with Xbal / Klenow and Kpnl and introduced 3 'of the hgh gene into the vector pUC19-linker-Hyg digested with EcoRI / Klenow and Kpnl, to obtain plasmid pUC19-linker-Hyg-spacer.
- the second 5 'cloned repeated edge to the hgh gene was introduced obtaining the spacer by digestion of the pUC-Spacer with EcoRJTKlenow and BamHI, and inserting it into the pUC19-linker- Hyg-spacer previously digested with Smal and BglII, obtaining the plas idio pUC- linker- spacer-Hyg-spacer.
- the bidirectional terminator rrnBTlT2 from E.coli was obtained by digestion with BspHI Mung bean nuclease and HindlII of the vector pTrcHisB (Invitrogen, USA) and by cloning the 470pb band in the pBluescript II SK digested with Hindffl and Smal (pBS-rrnTlT2).
- the vector for the stable transformation and expression of heterologous genes in plastids of Angiosperm plants proposed by this invention was assembled step by step as follows: the selection cassette with repeated borders was excised by digestion with Notl / Klenow and I left the plasmid pBS -linker-spacer-Hyg-spacer-rrnTlT2, and was inserted into vector pBR322 previously digested with EcoRI Klenow and Sal ⁇ to produce plasmid pBR322-s ⁇ -Hyg-sp-T; then, the plasmid obtained was digested with BamHI / Klenow and Xbal and the rbcL edge extracted from the pBR322rbcLOK construct was inserted by digestion with HindlII / Klenow and Xbal conforming the vector pBR-sp-Hyg-sp-T-rbcL ; finally, the atpB-edge was cleaved from the complete pBSatpB plasmid by digestion
- the pVTPA-f vector allows the stable transformation of Angiosperm plastids and the obtaining of transplastomic plants that express the recombinant proteins encoded by the genes cloned in it, as long as they are preceded by DNA sequences that allow ribosome binding and translation initiation.
- Vector pVTPA variant of the vector pVTPA-f that allows inserting and expressing in plastids several genes as independent transcriptional units.
- a vector variant for stable transformation in plastids and the expression of several genes as independent transcriptional units is obtained by inserting within the cloning sites of pVTPA-f a DNA sequence capable of promoting transcription in plastids and terminator sequences of the transcription (see Figure 1-E).
- a synthetic fragment encoding the promoter of the 16S subunit of plastid ribosomal RNAs (Prrn) (sequence No. 14), and containing cloning sites to facilitate genetic manipulations, was inserted between the EcoRI and Smal sites of the pBluescript II SK vector, to obtain the plasmid pBS-Prrn.
- the DNA fragment containing the Prm promoter was cleaved from pBS-Prrn by digestion with the HindlII and Mlul enzymes and inserted between these same sites of the pVTPA-f vector to give rise to the pVTPA construct (see Figure 3, and sequence No .fifteen).
- Example No.2 Expression of a heterologous monoistronic unit in tobacco transplastomic plants (pVTPA-f-GUS).
- a heterologous gene In order for a heterologous gene to be expressed in transplastomic plants using the pVTPA-f vector, it must have a ribosome-binding region (RBS) at a suitable distance (5 to 15 bp) from the translation start codon. For this reason, in order to facilitate the cloning of genes in our vector for the transformation and expression of genes in plastids, we design an intermediate vector (pVTEP) that allows cloning the gene of interest into it and then cleaving it by enzymatic digestion to insert it into the vector pVTPA-f (or pVTPA).
- RBS ribosome-binding region
- the cloning step in the pVJEP vector helps to introduce an RBS to the gene of interest, while allowing an additional transcription terminator or promoter to be added for expression from the vector object of this invention.
- a synthetic AD ⁇ fragment carrying the tobacco psbA gene promoter with part of its 5 'non-translatable region (between the -68 and -25 position) was cloned in the pBluescript II Sk digested with EcoRI and Smal from the beginning of translation) deleted to avoid controlling the translation of this gene by light (PpsbA * , sequence ⁇ o.16).
- pBSPpsbA plasmid pBSPpsbA, to which it was added following the PpsbA promoter, by ⁇ del-Sacl digestion (the Sacl site is lost after this cloning), a synthetic fragment that includes a minicistron (to stabilize the rtVR ⁇ A and favor its translation) and provides an RBS and multiple sites for the cloning of a gene in it (sequence No.17).
- the resulting plasmid was called pBSPpsbA-linker.
- the pVTEP vector was finally obtained by inserting into the pBSPpsbA-linker digested with BamHJ.
- Sequence No.18 corresponds to the primary structure of the pNIEP vector (between the Kpnl site and the second site I left), and its map is shown in Figure 4.
- a version of the pVTEP intermediary vector without the PpsbA promoter and without a minicistron was obtained by digesting it with EcoRI / Mung bean nuclease and SnaBI, and releasing this plasmid to obtain the pVIEP-2 construct.
- the uidA (gus) gene was obtained from plasmid pDMC200 (CAMBIA) by digestion with ⁇ col and Smal, and was cloned into ⁇ NEP-2 also digested to obtain pVTEP-GUS; from this plasmid the sequence coding for the uidA gene fused to an RBS was obtained by digestion with HindIII-Smal and cloned under the rice rbcL promoter into the vector for transformation of pVTPA-f plastids digested with Mlul / Klenow and HindIII.
- SR1 SR1
- SI Salts and Vitamins MS (Murashige T., Skoog F. Physiol. Plant. 1962, 15: 493-497)
- Microprojectiles for bombardment are prepared using 0.6 ⁇ m gold spherical particles (BioRad), according to published protocol (Russell DR, Wallace KM, Bathe JH, et al.
- Plant Cell Rep. 1993, 12: 165-169 The transformation is performed using the Biorad PDS-1000 / He system at a pressure of 1100 psi, a shooting distance of 6 cm and one shot per leaf.
- the bombarded leaves are kept in the same iso-osmotic medium for an additional 14 to 16 hours and subsequently they are passed to medium YES for two days.
- the bombed leaves are then cut into fragments of approximately 3x3 mm and transferred, with the abaxial side down, to SI medium with 5mg / L of Hygromycin-B (Duchefa, Holland).
- Resistant corns and green shoots appear between 6 and 8 weeks of cultivation; they are separated from the dead tissue and transferred to the same selective medium for a second and third selection cycles in increasing concentrations of Hygromycin-B (10 mg / L and 15 mg / L). Finally, the resistant shoots obtained are passed to MS medium (MS Salts and Vitamins, Sucrose 30g L, Fitagel 4g / L, pH 5.7) with Hygromycin-B at 15 mg / L, for their development and rooting. All the cultivation is carried out with a regime of 16 light hours and 8 hours of darkness. The GUS activity of some of the clones obtained resistant to hygromycin was analyzed by histochemical assay using X-Gluc according to the methodology described by Jefferson (Jefferson RA Plant Mol. Biol. Rep. 1987, 5: 387-405).
- the band of approximately 6.8 Kb expected in the positive clones was detected in all the clones ana ⁇ zados and not in the control without transforming (where the characteristic band of 21.5 Kb was detected); When some of these clones were propagated without the selection agent in the culture medium, it was observed in the Southern blot that the size of the DNA band that hybridizes with the labeled probe decreases to 5.5 Kb, which confirms the elimination of the hgh marker gene by homologous recombination between the sequences that surround it.
- Example No.3 Expression under two promoters of a heterologous monoistronic unit in tobacco transplastomic plants (pVTPA-aadA).
- pVTPA vector it is possible to express in plastids a gene under the rice and Prm rbcL promoters; for this, the gene encoding the amino glycoside adenyl transferase (aadA, confers resistance to antibiotics streptomycin, spectinomycin and others) was amplified by PCR from the pDElOOl vector (Department of Genetics, University of Ghent Belgium) using the oligonucleotides described in sequences No.20 and No.21.
- adA amino glycoside adenyl transferase
- the product of the PCR reaction was cloned directly into the XVV / Klenow digested pVTPA vector under the two aforementioned promoters to give rise to the pVTPA-aadA construct (sequence No.22).
- the obtaining of tobacco transplastomic plants was reopened according to the methodology described in the previous Example (Example No.2), with the particularity that the selection of the transplastomic clones was initially made using 500 mg / L spectinomycin in the SI medium, and then streptomycin at 500 mg / L during the second selection cycle.
- Example .4o.4 Expression of a heterologous bi-cistronic unit in tomato transplastomic plants (pVTPA-f-GUS-aadA).
- the vector object of this invention it is possible to express several genes in the form of a polycistronic unit.
- the gus gene into the vector pVTPA-f-GUS (Example ⁇ o.2) the aadA gene to form a tristronic unit (considering that the hgh marker gene will also be expressed as part of the mRNA produced from the rbcL promoter), which after allowing the elimination of the selection marker when the homoplasmic transplastomic plants are obtained will express in them the ⁇ -glucuronidase and the amino-glycoside adenyl transferase.
- the aadA gene was amplified by PCR as described in Example No.3, and cloned into the Apal site of plasmid pVTPA-f-GUS, to give rise to the vector pVTPA-f-GUS-aadA (sequence No.23).
- This new vector was used to obtain transplastic tomato plants according to the methodology described below: Tomato seeds of the Campbell-28 variety were sterilized with 10% sodium hypochlorite for 15 minutes, and then washed with abundant sterile distilled water.
- the seeds were germinated for 12 days in the MSO medium (MS salts; Gamborg B5 Vitamins; 30 g L Sucrose; 8 g / L Phytoagar; pH 5.8) diluted in half, and the cotyledonal leaves were collected in liquid MSO medium and cultured with the abaxial side down on a plate with solid medium MSO + lmg / L of zeatin with 0.4 M of mannitol for an osmotic pre-treatment for 4h.
- the microprojectiles for the bombardment were prepared using 0.6 ⁇ m gold spherical particles and the transformation is carried out using the Biorad PDS-1000 / He system at a pressure of 1100 psi, a shooting distance of 6 cm and a plate shot.
- Bombed cotyledons are kept in the same iso-osmotic medium for an additional 14 to 16 hours and subsequently passed to MSO + zeatin medium for two days with the abaxial side up.
- the bombed cotyledons are then transferred, with the abaxial side up, to MSO + zeatin medium with 5mg L of Hygromycin-B (Duchefa, Holland).
- Resistant corns and green shoots appear between 3 and 6 weeks of cultivation; they are separated from dead tissue and transferred to the same selective medium for a second cycle of selection at 10 mg / L concentration of Hygromycin-B.
- the present example illustrates not only the potential of the vector developed by us to express several genes as part of the same mRNA, but also confirms the universality of the vectors object of this invention as a vehicle for obtaining transplastomic clones of different Angiosperm plants of the donor plants of the sequences used as borders for the integration of heterologous DNA into the genome of plastids.
- Example No.5 Expression of two independent transcriptional units in tobacco transplastomic plants (pVTPA-HB-aadA). Obtaining transplastomic plants that express a multimeric vaccine antigen.
- hepatitis B surface antigen (HBsAg) (Valenzuela P; Gray P; Quiroga M; Zaldivar J; Goodman HM; Rutter WJ Nature 1979, 280: 815-819) was obtained from plasmid pSAO503 (CIGB , Cuba) by digestion with EcoRI / Klenow and Ncol, and was introduced into the vector ⁇ VIEP-2 (see Example No.2) digested with Ncol and Smal, to place a ribosome binding site before the translation start codon .
- HBsAg hepatitis B surface antigen
- the pNTPA-HB-aadA vector was used to obtain tobacco transplastomic plants expressing hepatitis B surface antigen, using the transformation protocol described in Example ⁇ o.2.
- the selection of the transplastomic clones was initially carried out with Hygromycin-B (10 mg / L) and in the end their resistance to Spectinomycin (500mg / L) was checked, and the expression of HBsAg by means of a specific ELISA type test (CIGB, Cuba), and Western blot ( Figure 6). The results obtained are shown in table 5: Table 5.
- Table 5 Obtaining tobacco transplastomic plants with the construction pVTPA-HB-aadA.
- Example No.6 Expression of a heterologous gene in plastids under two promoters and a minicistron (pVTPA-GUSl-aadA and ⁇ VTPA-GUS3-aadA).
- the intermediate vector for the cloning and expression of genes in the object vectors of this invention allows a gene to be cloned therein under the PpsbA promoter and a minicistron designed to increase stability and promote the translation of mRNA produced.
- this vector it was cloned into the uidA gene as described in Example No.2 to obtain the plasmid pVTEP-GUSl.
- a genetic construction was performed in which the minicistron was removed from the pVTEP by Ndel + SnaBI digestion, treatment with SI nuclease and recircularization of the plasmid to obtain the pVIEP-3 vector, where the uidA gene of the manner described above giving rise to plasmid pVTEP-GUS3.
- Both cassettes containing the gus gene were obtained from the intermediate vectors by digestion with HindIII and cloned into the equally digested pVTPA-aadA vector.
- Transplastomic plants were obtained with both constructions, and the GUS expression levels of 5 clones of each of them were compared by the fluorimetric method using 4-MUG according to the methodology described by Jefferson (Jefferson R. A.
- Rice transplastomic plants were obtained repeatedly using the following methodology: Embryogenic calluses (21 days) formed in medium N6-2 (Salts and vitamins of medium N6 (Chu CC; et al. Scientia Sinicl975, 18: 659); O.lg / L of myo-inositol are used; Casein hydrolyzate 1 g / L; 2.4 D at 2mg L; Sucrose 30g / L; Fitagel 3 g L, pH 5.7) from mature rice seeds. These calluses are subcultured for 5 days in fresh N6-2 medium and subsequently passed to N6-2 medium with 3mg / L of kinetin for 48-72 hours in the dark.
- the calluses are subcultured in the same medium supplemented with 0.4 M mannitol for osmotic pretreatment.
- 30 calluses are placed in the center of the plate to be bombarded with the following conditions (1100 psi pressure, 6cm distance, 0.6 ⁇ m gold particles loaded with plasmid pVTPA-f-GUS-aadA and one shot per plate).
- the calluses remain in the same osmotic medium for 16h in the dark and then subculture 2 days in N6-2 medium without mannitol under the same conditions.
- the calluses are transferred to N6-2 medium with 20 mg / L of Hygromycin-B.
- calluses capable of growing in the presence of the antibiotic are transferred to the same fresh medium for a second cycle of selection for 10 days.
- the resistant calluses are passed to modified KIBAN regeneration medium (Salts and vitamins of the MS medium; Kinetin 3 mg / L; BAP 0.5 mg / L; NAA 1 mg / L; Maltose 30 g / L; pH5.7; Fitagel 4.5 g / L) plus 30 mg / L of Hygromycin-B, and the green shoots of approximately 2 cm obtained after 3-4 weeks of cultivation in a regime of 16h light and 8h dark, are passed into a micropropagation cycle between Modified liquid MS (Salts and vitamins of the MS medium; Sucrose 30 g / L; BAP 5mg / L, pH 5.7) with 20mg / L of Hygromycin.
- the shoots are placed in erlenmeyers with 50 ml of said medium and incubated under stirring at 150 rpm at 28 ° C with a photo period of 16 h light and 8 h darkness. Approximately 7 axillary shoots are obtained per explant after 7 days, which are then rooted in solid MS medium plus 30 g / L of Sucrose and 30 mg / L of Hygromycin-B.
- Table 7 Obtaining rice transplastomic plants (var. IAC-28) with the construction pVTPA-f-GUS-aadA with and without using pre-treatment with cytokinins (kinetin at 3 mg / L).
- Example No.8 Obtaining of sugarcane transplastomic plants with the construction pVTPA-f-GUS-aadA.
- sugarcane transplastomic plants The buds of sugarcane field plants (var. Ja60-5) of 6 months of age are taken, disinfected with 70% ethanol for 1 minute and then for 10 minutes in 10% sodium hypochlorite, wash thoroughly with sterile distilled water.
- Segments of 0.5xlcm are isolated from the base of the young leaves and grown in light in solid medium P + 5 (10 mg / L of myo-Inositol; 500mg / L of Casein Hydrolyzate; Salts and Vitamins MS; Sucrose 20g / L; 5mgL of 2.4D; Fitagel 4g / L; pH 5.7) with 3 mg / L of kinetin for 48 hours, followed by a culture in the same medium with 0.4 M of Mannitol for 6-8h, in the light.
- P + 5 10 mg / L of myo-Inositol; 500mg / L of Casein Hydrolyzate; Salts and Vitamins MS; Sucrose 20g / L; 5mgL of 2.4D; Fitagel 4g / L; pH 5.7
- the regenerated shoots are individualized after 4-6 weeks of culture and are rooted in P- medium with the selective agent at 20 mg / L. Respect to Spectinomycin (at 500 mg / L), as well as the expression of the gus gene (by histochemical assay), was evaluated in the obtained clones. The results of two transformation experiments are shown in the following table 8:
- the present example confirms again, this time through the transformation of a monocot species, the universality of the vectors object of this invention as a vehicle for obtaining transplastomic clones of Angiosperm plants different from the donor plants of the sequences used as borders for integration of heterologous DNA in the genome of plastids.
- Example No.9 Obtaining transplastomic plants with desirable agronomic characters. Obtaining transplastomic plants with new agronomic characteristics incorporated is essential for the fight against diseases, pests and weeds, increased yields, reduced costs and better product qualities, without the danger of escaping into the environment. of the new genes introduced.
- the pat (bar) gene of Streptomyces hygroscopicus (Thompson CJ; Movva NR; Tizard R; Crameri R; Davies JE; et al.
- the vector object of this invention it is feasible to introduce and express in the transplastomic plants genes that confer resistance to pests and diseases, such as for example the genes coding for the entomocidal protein crystals of Bacillus thuringiensis; or for proteins with antimicrobial activity such as chitinases and glucanases; or anti-stress abiotic such as choline oxidase.
- the modification or introduction of genes that increase the efficiency of the photosynthetic process, or the quality of plant products, are other of the many feasible actions to be carried out with the use of the universal vector for the transformation of Angiosperm plastids proposed here.
- Example No.10 Expression of proteins of non-agronomic utility in plastids.
- Example No.5 we demonstrate the usefulness of the vector that we propose here to stably introduce and express genes encoding multimeric proteins in plastids of Angiosperm plants.
- Other proteins for medical, veterinary or industrial use are equally feasible to be produced in transplastomic plants through the use of our transformation / expression vector system.
- the fibrinohtic streptokinase agent of great therapeutic utility for the treatment of thrombosis and myocardial infarctions, the 1254 bp DNA fragment encoding the mature protein SKC-2 of Streptococcus was excised from the vector pEKG-3 (Estrada MP; Hernández L; Pérez A; Rodr ⁇ guez P; Serrano R; Rubiera R; Pedraza A; et al.
- pVIEP-Estrep I obtained by digestion Sal ⁇ + Xhol the cassette for the expression of the streptokinase gene in plastids under the PpsbA promoter and the minicistron; This cassette was cloned into the pVTPA vector (see Example No.1) digested with Sal ⁇ and Xhol to obtain the pVTPA-Estrep plasmid (Sequence No.26).
- Example No.11 Expression of unoglobulins in plastids.
- the DNA fragment encoding the heavy and light chains of the specific CB-Hep.l monoclonal antibody against HBsAg were obtained by Ncol-Xbal digestion of the plasmids pHES ⁇ HBsAgCL and pHES ⁇ HBsAgCH (Nadia Ram ⁇ rez, "Tobacco (Nicotiana tabacum L.) transgenic : a system for the production of an anti-HBsAg antibody and its fragments ", PhD thesis, CIGB, 2002) and inserted into the pNTEP vector digested with these same enzymes to obtain plasmids pVEEP-Hc and pVTEP-Lc.
- the fragment encoding the light chain was cleaved from the pVEEP-Lc by SnaBI-BamHJ digestion, and then inserted into the one encoding the heavy chain in the plasmid pVIEP-Hc by digestion with Smal-BamHI, to obtain the bicistronic construction pVJEP-HcLc, from where both genes were finally introduced into the vector for the transformation of Angiosperm plastids pVTPA-f by HindIII digestion; thus, after searching for the clone with the correct orientation, the plasmid pVTPA-HcLc was obtained which was introduced to tobacco plastids as described in Example ⁇ o.2.
- transplastomic plants obtained were analyzed by Western blot to detect the presence of both chains of the CB-Hep antibody. l ( Figure 7), and additionally the functionality of the recombinant immunoglobulin obtained using an extract of the transplastomic plants was demonstrated to detect the presence of HBsAg in an ELISA that was revealed with a rabbit polyclonal conjugate with alkaline phosphatase. In this way, while we demonstrate the possibility of obtaining fully functional antibodies with our transformation / expression vectors in transplastomic plants, we reaffirm the possibility of correctly expressing and assembling multimeric proteins in plastids.
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Priority Applications (7)
Application Number | Priority Date | Filing Date | Title |
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CA002496913A CA2496913A1 (en) | 2002-09-27 | 2003-09-15 | Vector for the production of transplastomic angiosperm plants |
BR0314841-6A BR0314841A (pt) | 2002-09-27 | 2003-09-15 | Vetor de dna, cultura, plantas angiospérmicas transplastÈmicas, progênie das mesmas e purificação e utilização da proteìna ou proteìnas que produzem as células das plantas |
AU2003266096A AU2003266096A1 (en) | 2002-09-27 | 2003-09-15 | Vector for the production of transplastomic angiosperm plants |
EP03798037A EP1557468A2 (en) | 2002-09-27 | 2003-09-15 | Vector for the production of transplastomic angiosperm plants |
US10/527,048 US20060026704A1 (en) | 2002-09-27 | 2003-09-15 | Vector for the production of transplastomic angiosperm plants |
MXPA05003185A MXPA05003185A (es) | 2002-09-27 | 2003-09-15 | Vector para la produccion de plantas angiospermas transplastomicas. |
JP2004538665A JP2006500037A (ja) | 2002-09-27 | 2003-09-15 | 被子植物遺伝子導入植物を作製するためのベクター |
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EP (1) | EP1557468A2 (es) |
JP (1) | JP2006500037A (es) |
KR (1) | KR20050054928A (es) |
CN (1) | CN1685047A (es) |
AR (1) | AR041375A1 (es) |
AU (1) | AU2003266096A1 (es) |
BR (1) | BR0314841A (es) |
CA (1) | CA2496913A1 (es) |
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Cited By (4)
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JP2006246744A (ja) * | 2005-03-09 | 2006-09-21 | Research Organization Of Information & Systems | 遺伝子導入方法、ジーンターゲッティング方法及びトランスジェニック植物の製造方法 |
EP2194140A2 (en) | 2005-03-02 | 2010-06-09 | Metanomics GmbH | Process for the production of fine chemicals |
US8030544B2 (en) | 2007-03-09 | 2011-10-04 | Monsanto Technology Llc | Methods for plant transformation using spectinomycin selection |
EP2573188A2 (en) | 2005-03-02 | 2013-03-27 | Metanomics GmbH | Process for the production of fine chemicals |
Families Citing this family (8)
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KR100740694B1 (ko) * | 2006-02-09 | 2007-07-18 | 한국생명공학연구원 | 색소체 게놈 내에 삽입된 외래유전자의 이차 재조합을방지하기 위한 벡터개발 |
GB0604938D0 (en) | 2006-03-11 | 2006-04-19 | Renovo Ltd | Proteins, nucleic acids and medicaments |
GB0604966D0 (en) | 2006-03-11 | 2006-04-19 | Renovo Ltd | Medicaments and proteins |
GB0604964D0 (en) | 2006-03-11 | 2006-04-19 | Renovo Ltd | Protein folding |
GB0617816D0 (en) * | 2006-09-11 | 2006-10-18 | Renovo Ltd | Nucleic acids and methods of protein expression |
US20110037083A1 (en) * | 2009-01-14 | 2011-02-17 | Alex Chi Keung Chan | Led package with contrasting face |
CN102618566B (zh) * | 2011-01-31 | 2014-01-08 | 中国科学院海洋研究所 | 一种构建亚心型扁藻叶绿体表达系统的方法 |
CN108192897A (zh) * | 2018-02-11 | 2018-06-22 | 云南省烟草农业科学研究院 | 一种烟草rbcl基因片段及其应用 |
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-
2003
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- 2003-09-15 JP JP2004538665A patent/JP2006500037A/ja not_active Abandoned
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- 2003-09-15 BR BR0314841-6A patent/BR0314841A/pt not_active IP Right Cessation
- 2003-09-15 US US10/527,048 patent/US20060026704A1/en not_active Abandoned
- 2003-09-15 CN CNA038229919A patent/CN1685047A/zh active Pending
- 2003-09-15 KR KR1020057004013A patent/KR20050054928A/ko not_active Application Discontinuation
- 2003-09-15 MX MXPA05003185A patent/MXPA05003185A/es unknown
- 2003-09-15 CA CA002496913A patent/CA2496913A1/en not_active Abandoned
- 2003-09-15 WO PCT/CU2003/000009 patent/WO2004029256A2/es not_active Application Discontinuation
- 2003-09-24 AR ARP030103474A patent/AR041375A1/es unknown
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WO1997006250A1 (en) * | 1995-08-10 | 1997-02-20 | Rutgers University | Nuclear-encoded transcription system in plastids of higher plants |
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EP2573188A2 (en) | 2005-03-02 | 2013-03-27 | Metanomics GmbH | Process for the production of fine chemicals |
JP2006246744A (ja) * | 2005-03-09 | 2006-09-21 | Research Organization Of Information & Systems | 遺伝子導入方法、ジーンターゲッティング方法及びトランスジェニック植物の製造方法 |
US8952217B2 (en) | 2005-10-14 | 2015-02-10 | Metanomics Gmbh | Process for decreasing verbascose in a plant by expression of a chloroplast-targeted fimD protein |
US8030544B2 (en) | 2007-03-09 | 2011-10-04 | Monsanto Technology Llc | Methods for plant transformation using spectinomycin selection |
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US8466345B2 (en) | 2007-03-09 | 2013-06-18 | Monsanto Technology Llc | Methods for plant transformation using spectinomycin selection |
US8872000B2 (en) | 2007-03-09 | 2014-10-28 | Monsanto Technology Llc | Methods for plant transformation using spectinomycin selection |
US9714428B2 (en) | 2007-03-09 | 2017-07-25 | Monsato Technology Llc | Methods for plant transformation using spectinomycin selection |
US10907167B2 (en) | 2007-03-09 | 2021-02-02 | Monsanto Technology Llc | Methods for plant transformation using spectinomycin selection |
US11807858B2 (en) | 2007-03-09 | 2023-11-07 | Monsanto Technology Llc | Methods for plant transformation using spectinomycin selection |
US12195736B2 (en) | 2007-03-09 | 2025-01-14 | Monsanto Technology Llc | Methods for plant transformation using spectinomycin selection |
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EP1557468A2 (en) | 2005-07-27 |
AR041375A1 (es) | 2005-05-11 |
ZA200501740B (en) | 2005-09-06 |
CA2496913A1 (en) | 2004-04-08 |
BR0314841A (pt) | 2005-08-09 |
AU2003266096A1 (en) | 2004-04-19 |
US20060026704A1 (en) | 2006-02-02 |
JP2006500037A (ja) | 2006-01-05 |
WO2004029256A3 (es) | 2004-04-29 |
MXPA05003185A (es) | 2005-06-08 |
KR20050054928A (ko) | 2005-06-10 |
CN1685047A (zh) | 2005-10-19 |
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