WO2012059217A1 - Vecteurs derives de densovirus pour le transfert de gene chez l'insecte - Google Patents
Vecteurs derives de densovirus pour le transfert de gene chez l'insecte Download PDFInfo
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- WO2012059217A1 WO2012059217A1 PCT/EP2011/005516 EP2011005516W WO2012059217A1 WO 2012059217 A1 WO2012059217 A1 WO 2012059217A1 EP 2011005516 W EP2011005516 W EP 2011005516W WO 2012059217 A1 WO2012059217 A1 WO 2012059217A1
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- WIPO (PCT)
- Prior art keywords
- vector
- recombinant
- particles
- nucleotide sequence
- densovirus
- Prior art date
Links
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Classifications
-
- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07K—PEPTIDES
- C07K14/00—Peptides having more than 20 amino acids; Gastrins; Somatostatins; Melanotropins; Derivatives thereof
- C07K14/435—Peptides having more than 20 amino acids; Gastrins; Somatostatins; Melanotropins; Derivatives thereof from animals; from humans
- C07K14/43504—Peptides having more than 20 amino acids; Gastrins; Somatostatins; Melanotropins; Derivatives thereof from animals; from humans from invertebrates
- C07K14/43513—Peptides having more than 20 amino acids; Gastrins; Somatostatins; Melanotropins; Derivatives thereof from animals; from humans from invertebrates from arachnidae
- C07K14/43522—Peptides having more than 20 amino acids; Gastrins; Somatostatins; Melanotropins; Derivatives thereof from animals; from humans from invertebrates from arachnidae from scorpions
-
- A—HUMAN NECESSITIES
- A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
- A01N—PRESERVATION OF BODIES OF HUMANS OR ANIMALS OR PLANTS OR PARTS THEREOF; BIOCIDES, e.g. AS DISINFECTANTS, AS PESTICIDES OR AS HERBICIDES; PEST REPELLANTS OR ATTRACTANTS; PLANT GROWTH REGULATORS
- A01N63/00—Biocides, pest repellants or attractants, or plant growth regulators containing microorganisms, viruses, microbial fungi, animals or substances produced by, or obtained from, microorganisms, viruses, microbial fungi or animals, e.g. enzymes or fermentates
- A01N63/50—Isolated enzymes; Isolated proteins
-
- 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
- C12N15/85—Vectors or expression systems specially adapted for eukaryotic hosts for animal cells
- C12N15/86—Viral vectors
-
- 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
- C12N2750/00—MICROORGANISMS OR ENZYMES; COMPOSITIONS THEREOF; PROPAGATING, PRESERVING, OR MAINTAINING MICROORGANISMS; MUTATION OR GENETIC ENGINEERING; CULTURE MEDIA ssDNA viruses
- C12N2750/00011—Details
- C12N2750/14011—Parvoviridae
- C12N2750/14041—Use of virus, viral particle or viral elements as a vector
- C12N2750/14043—Use of virus, viral particle or viral elements as a vector viral genome or elements thereof as genetic vector
-
- 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
- C12N2830/00—Vector systems having a special element relevant for transcription
- C12N2830/75—Vector systems having a special element relevant for transcription from invertebrates
Definitions
- the present invention relates to methods for producing non-replicating recombinant Junonia coenia densoviruses for transferring a gene encoding a toxin into an insect and their use in the control of insect pests of culture.
- Densoviruses are pathogenic viruses capable of autonomous replication and belonging to the parvovirus family.
- the densovirus genome encapsidated in a non-enveloped icosahedral capsid, consists of a linear single-stranded DNA approximately 6 kilobases in length and comprising two regions of coding sequences.
- One of these coding regions comprises a 5 'open reading frame (ORF1) encoding the four capsid (VP) proteins on one strand.
- the other coding region comprises three open reading frames ORF2, ORF3 and ORF4 5 'on the complementary strand and encoding the nonstructural proteins (NS) of the densovirus.
- ITRs inverted repeat terminal sequences
- Densoviruses have the interesting feature of being pathogenic only with regard to invertebrates and especially insects and crustaceans. It has not been established pathogenicity in mammals and especially humans. The use of such densoviruses to control crop pests is therefore of great interest. This interest was confirmed by the possibility of inserting the genome of densovirus into bacterial plasmids, because of their small size, thus favoring genetic manipulation as well as the production of recombinant densoviruses.
- Junonia coenia densoviruses have the particularity of benefiting from a host spectrum extended to several species of Lepidoptera, notably Agla ⁇ s urticae L. (Nymphalidae), Lymantria dispar L. (Lymantriidae), Bombyx mori L. (Bombyco ⁇ dae). ), Mamestraoleracea, M. brassicae L. (Noctuidae), Spodoptera exigua, S. littoralis, S. frugiperda (Noctuidae).
- the recombinant JcDNV particles according to the invention can not replicate in the environment, but they make it possible to combat insect pests of culture, and in particular lepidopterans, by the expression of a toxin in the cells of said insects after infection.
- Figure 1 Constructs for the production of recombinant and non-replicating JcDNV particles.
- a first subject of the invention relates to a vector, which vector is derived from the Junonia Coenia densovirus genome, comprising a nucleotide sequence decomposing as follows:
- a 5' inverted terminal repeat (ITR) nucleotide sequence comprising at least nucleotides 1 to 149 of the sequence SEQ ID No. 1, the length of said 5 'ITR sequence being less than or equal to at 259 nucleotides; (ii) centrally, a nucleotide sequence operably linked to a promoter, said nucleotide sequence encoding a toxin; and (iii) at the 3 'position, a 3' inverted terminal repeat (ITR) nucleotide sequence comprising at least nucleotides 369 to 518 of the sequence SEQ ID NO: 3, the length of said 3 'ITR sequence being less than or equal to 259 nucleotides, preferably said 3 'ITR nucleotide sequence is complementary to the 5' ITR nucleotide sequence;
- Said vector does not comprise other viral nucleotide sequences of Junonia coenia densovirus than the ITR sequences according to (i) and (iii).
- vector means any vehicle capable of facilitating the transfer of a nucleotide sequence into a cell, preferably an insect cell.
- the vectors according to the invention include, without limitation, the plasmids, cosmids, phagemids or any other vehicle derived from viral or bacterial sources that have been manipulated for the insertion or incorporation of a nucleotide sequence, for example, and without limitation, baculovirus-type vectors.
- the vectors may include selection markers so as to allow the identification of the cells having integrated said vectors.
- the vectors according to the invention are plasmid vectors, also called plasmids.
- Plasmids have been widely described in the prior art and are well known to those skilled in the art (see, for example, SANBROOK et al., "Molecular Cloning: A Laboratory Manual,” Second Edition, Cold Spring Harbor Laboratory Press, 1989). By way of examples, mention may be made of the most commonly used plasmids such as pBR322, pUC18, pUC19, pRC / CMV, SV40, and pBlueScript. Plasmids can be engineered by the use of restriction enzymes and ligation reactions to remove or add specific DNA fragments.
- the plasmids in which the nucleotide sequences are inserted are in the form of a linear or circular single or double-stranded DNA.
- the plasmids can be delivered to the cells by transformation, according to the method described below.
- the vector derived Junonia coenia densovirus can be called "toxic vector" in that it carries a nucleotide sequence that encodes a term-expressed toxin in the infected insect cell.
- nucleotide sequence refers to a DNA sequence (for example a cDNA or genomic or synthetic DNA) or to an RNA sequence (for example a messenger RNA or synthetic RNA), as well as DNA or RNA analogs containing unnatural nucleotide analogues, unnatural internucleotide linkages, or both.
- said nucleotide sequence is a DNA sequence.
- the nucleotide sequences may have any topological conformation, such as linear or circular.
- ITRs inverted repeated terminal sequences
- ITRs means sequences with a hairpin structure located at the 5 'and 3' ends of the Junonia coenia densovirus genome ( respectively SEQ ID No. 1 and SEQ ID No. 3). These ITR sequences with a length of 518 nucleotides are known for their involvement in the phenomenon of encapsidation of the viral genome as well as for their role in the replication of the viral genome.
- the ITRs sequences according to the invention have the particularity of having been partially deleted.
- the minimal sequences of ITRs of the vector according to the invention thus retain their function of encapsidation of the genome in the structural proteins of the capsid.
- the absence of any other viral sequences on the vector prevents replication of the vector autonomously.
- the 5 'ITR nucleotide sequence does not comprise more than 225 nucleotides of the sequence SEQ ID No. 1, as examples not more than 200 or 175 nucleotides, and more preferably not more than 160 nucleotides. of the sequence SEQ ID No. 1.
- the 5 'ITR sequence consists of nucleotides 1 to 149 of the sequence SEQ ID No. 1 (SEQ ID No. 2).
- the 5 'ITR nucleotide sequence does not comprise more than 225 nucleotides of the sequence SEQ ID No. 3, as examples not more than 200 or 175 nucleotides, and more preferably not more than 160 nucleotides. of the sequence SEQ ID No. 3.
- the 3 'ITR sequence consists of nucleotides 369 to 518 of the sequence SEQ ID NO: 3 (SEQ ID NO: 4).
- toxin means a molecule exhibiting a toxic activity on a cell, which toxic activity may cause cell death but also a disruption of one or more cellular functions, which cellular disturbances are likely to cause an organism to be delayed. growth or death of said organism.
- organism refers to any insect infected with recombinant and non-replicating JcDNV particles.
- a toxin according to the invention may be a vector polypeptide of a toxicity in the cell in which it is expressed.
- This toxicity causes in particular harmful effects such as destruction of the cell, its components or its functions.
- polypeptides known for their toxic activity with regard to insects, and especially lepidopterans such as toxic polypeptides derived from the venom of various animals (venom neurotoxin).
- toxic polypeptides produced by plants or microorganisms such as ricin or Cry toxins of Bacillus thuringiensis (Bt Kurstaki 1970, Bt aizawai 1989).
- the neurotoxin of scorpion venom AaH-IT1 of protein sequence SEQ ID No. 5 will be used.
- a toxin according to the invention may be a DNA or RNA nucleic acid molecule, such as RNA interference (RNAi), said molecule having an inhibitory activity against the expression of a specific gene. .
- RNAi RNA interference
- This activity results in particular in the rapid degradation of a targeted messenger RNA and leads to the extinction of the transcription of the targeted gene.
- a toxin having a medium stability will be selected.
- Medium stability means a toxin that degrades in less than 7 days, in less than a day or in less than 7 hours.
- operably linked to a promoter is meant the link by which a promoter is located contiguous to a nucleotide sequence of interest for controlling the expression of said sequence.
- the promoter is here operably linked to the nucleotide sequence coding for the toxin to control its expression.
- promoters allowing the expression of a toxin in insect cells
- ubiquitous promoters such as the Bombyx mori Actin A3 promoter of SEQ ID No. 6 or specific promoters can be used. of a fabric.
- the promoter allowing the expression of a toxin of the vector according to the invention is an inducible promoter so as to be able to regulate the expression of said toxin by administering, simultaneously or otherwise, the vector and the inducer of said promoter.
- the vector according to the invention does not comprise other viral nucleotide sequences of Junonia coenia densovirus than the ITR sequences according to (i) and (iii).
- This vector is in fact constructed from a vector comprising the complete genome of the Junonia coenia of sequence SEQ ID No. 7.
- the vector according to the invention does not comprise other nucleotide sequences of the sequence SEQ ID No. 7.
- a second subject of the invention relates to a method for producing recombinant and non-replicating Junonia coenia (JcDNV) densovirus particles, said method comprising the following steps:
- nucleotide sequences coding for the structural proteins VP1 (SEQ ID NO: 8), VP2 (SEQ ID NO: 9), VP3 (SEQ ID NO: 10) and VP4 (SEQ ID NO: 1) of the Junonia coenia or their derivatives, said nucleotide sequences being operably linked to a promoter, preferably the JcDNV P9 promoter, and
- nucleotide sequences coding for the nonstructural proteins NSI (SEQ ID No. 13), NS2 (SEQ ID No. 14) and NS3 (SEQ ID No. 15) of the Junonia coenia densovirus or their derivatives, said nucleotide sequences being operably linked to a promoter, preferably the JcDNV P93 promoter,
- the second vector according to the invention constitutes a complementation vector, also known as a "helper" vector, that is to say a vector carrying the various functions or elements missing from the carrier vector of the nucleotide sequence coding for a vector.
- toxin such as the nucleotide sequences encoding the proteins necessary for encapsidation (NS) or the capsid-forming proteins (VP), necessary for the production of a recombinant and non-replicating Junonia coenia densovirus particle.
- Structural proteins also known as viral proteins (VPs) are the proteins of the capsid of the densovirus. They are 4 in number: VP1, VP2, VP3 and VP4, respectively having the following protein sequences: SEQ ID No. 8, SEQ ID No. 9, SEQ ID No. 10 and SEQ ID No. 11.
- the promoter used for the expression of said structural proteins VP is the P9 promoter of Junonia coenia densovirus of sequence SEQ ID No. 12.
- Nonstructural proteins also known as non-structural proteins (NS) participate in the replication and assembly of the VP structural proteins for capsid formation. These nonstructural proteins are three in number: NSI, NS2 and NS3, respectively having the following protein sequences: SEQ ID No. 13, SEQ ID No. 14 and SEQ ID No. 15.
- the promoter used for the expression of said nonstructural NS proteins is the P93 promoter of JcDNV of sequence SEQ ID No. 16.
- derivative is intended to mean a nucleotide sequence coding for a polypeptide having an identity percentage of at least 95% with the polypeptide sequence of a structural protein (VP) or non-structural protein (NS) of Junonia coenia densovirus such as previously defined.
- VP structural protein
- NS non-structural protein
- percentage identity between two polypeptide sequences is meant the percentage of identical amino acids, between two sequences to be compared, obtained with the best possible alignment of said sequences. This percentage is purely statistical and the differences between the two sequences are randomly distributed throughout the length of the amino acid sequences.
- “best possible alignment or optimal alignment” is meant alignment to obtain the highest percentage of identity. Sequence comparisons between two amino acid sequences are usually performed by comparing said sequences after they have been aligned in the best possible alignment; the comparison is then performed on comparison segments so as to identify and compare regions of similarity.
- the best possible alignment for comparison can be achieved using the global homology algorithm developed by SMITH and WATERMAN ⁇ Ad. App. Math., Vol.2, p: 482, 1981), using the local homology algorithm developed by NEDDLEMAN and WUNSCH (J. Mol Biol., Vol.48, p: 443, 1970), using the similarity method developed by PEARSON and LIPMAN ⁇ Proc. Natl. Acd. Sci.
- the BLAST program will preferably be used with the BLOSUM matrix 62 or the PAM matrix 30.
- the percentage of identity is determined by comparing the two optimally aligned sequences, said sequences may comprise additions or deletions with respect to the reference sequence so as to obtain the best possible alignment between these two sequences.
- the identity percentage is calculated by determining the number of identical positions between the two sequences, dividing the number obtained by the total number of positions compared and multiplying the result obtained by 100 to obtain the percentage identity between these two sequences. .
- the 5 'inverted terminal repeat (ITR) sequence comprising at least nucleotides 1 to 149 of the sequence SEQ ID No. 1, the length of said 5' ITR sequence being less than or equal to 259 nucleotides. is not included in any complementation vector as defined above.
- the inverted terminal repeat nucleotide sequence (ITR) at the 3 'position comprising at least the nucleotides 369 to 518 of the sequence SEQ ID No. 3, the length of said ITR sequence at 3' being less than or equal to 259. nucleotides, is not included in any complementation vector.
- Two vectors according to the invention do not share sequences of more than 100 base pairs, more than 50 base pairs or more than 25 base pairs that share more than 50% identity, 30% identity or 20 base pairs. % identity.
- transformation is meant any method for the transfer of a gene, preferably in an insect cell.
- the transformation of the insect cells can be carried out using methods known to those skilled in the art such as the use of transfection or transduction.
- transfection is used to transfer the nucleotide sequences into the insect cells.
- transfection is meant the introduction of DNA into a eukaryotic cell.
- the transfection of the cells can be carried out by the use of calcium phosphate, liposomes or lipid vectors such as Lipofectamine® (INVITROGEN), highly branched polycationic agents.
- the harvesting of the recombinant and non-replicating JcDNV particles can be carried out according to the following protocol, said protocol not being limiting: four days post-transfection, the cells and the culture supernatants were harvested to undergo three cycles of freezing / thawing followed by ultrasound treatment. Subsequently, the supernatants are clarified for 10 minutes at 5000 g, and then the virus particles are concentrated by ultracentrifugation at 175,000 g in a Beckman SW41ti rotor for 2 hours at 4 ° C. The viral particles are resuspended in PBS.
- a third subject of the invention relates to an insect cell comprising:
- Said insect cell is in particular used for the production of recombinant and non-replicating Junonia coenia densovirus particles according to the method described previously.
- An insect cell according to the invention has the characteristics of being culturable and transformable. Said cell is also capable, after transformation with the vectors according to the invention, of replicating the recombinant densovirus, but also of expressing the viral (VP) and non-structural (NS) proteins to produce recombinant Junonia coenia densovirus particles and non-replicative.
- VP viral
- NS non-structural
- insect cells As examples of insect cells, the following cells can be used:
- culture conditions of the insect cells As examples of culture conditions of the insect cells, the following conditions can be used:
- a fourth subject of the invention relates to a kit for producing recombinant and non-replicating Junonia coenia densovirus particles according to the method defined previously comprising:
- the kit for producing recombinant and non-replicating JcDNV particles of the present invention comprises:
- the kit for producing recombinant and non-replicating Junonia coenia densovirus particles further comprises insect cells as defined above.
- a fifth subject of the invention relates to a recombinant and non-replicating Junonia coenia densovirus particle obtainable according to the method defined above and consisting of a capsid containing a nucleotide sequence which comprises:
- nucleotide sequence operably linked to a promoter, said nucleotide sequence encoding a toxin; and (iii) at the 3 'position, an inverted repeat terminal nucleotide sequence (ITR) at 3' as defined above;
- recombinant Junonia coenia densovirus particle means a viral particle produced from a modified densovirus genome.
- the genome of the recombinant Junonia coenia densovirus according to the invention was modified by the partial deletion of the inverted repeat terminal sequences (ITRs) in 5 'and 3' to maintain at least the encapsidation function of these sequences, as well as by the deletion of all the viral sequences of JcDNV between the two ITRs sequences.
- ITRs inverted repeat terminal sequences
- a nucleotide sequence coding for a toxin has also been inserted between partially deleted ITR sequences.
- recombinant and non-replicating Junonia coenia densovirus particle means a recombinant Junonia coenia densovirus viral particle that does not have the capacity to replicate its genome for the purpose of producing densoviruses from its genetic material alone or from that of the host cell.
- the recombinant and non-replicating Junonia coenia densovirus particles are produced in the method described above from the carrier vector of the nucleotide sequence coding for a toxin with the aid of the carrier complementing vector (s). viral sequences necessary for encapsidation and viral replication. Thus, in the absence of these complementation vectors expressing the structural and nonstructural proteins, the recombinant Junonia coenia densovirus particles can not replicate.
- a sixth object of the invention relates to a use of recombinant and non-replicating Junonia coenia densovirus particles as defined above as an agent for controlling Lepidoptera.
- the genome of the recombinant and non-replicating JcDNV particles according to the invention comprises a nucleotide sequence operably linked to a promoter, said nucleotide sequence coding for a toxin.
- Said toxin may be expressed in infected insect cells and is the means of controlling these particles of densovirus against lepidopteran pests culture.
- a seventh subject of the invention relates to a composition comprising the recombinant and non-replicating Junonia coenia densovirus particles as described above.
- said composition according to the invention also comprises a promoter inducer operably linked to the nucleotide sequence coding for a toxin when said promoter is an inducible promoter.
- An eighth object of the invention relates to a use of a composition as described above as a means of combating Lepidoptera.
- a ninth object of the invention relates to a method for treating plants, said method comprising a step of spreading recombinant and non-replicating Junonia coenia densovirus particles as described above on plant cultures.
- the plants treated according to said treatment method are rice, corn, cotton, soybean, sorghum, sugar cane, tomato, pepper, alfalfa.
- the sequence encoding the toxin is under the control of an inducible promoter and the plant treatment method according to the invention comprises a step of spreading the compound inducing said promoter simultaneously, before or after the step of spreading recombinant and non-replicating Junonia coenia densovirus particles as previously described.
- the complementation vectors carry the structural genes (VPs) under the control of a promoter and / or non-structural genes (NS) also under the control of a promoter without however carrying the ITRs sequences.
- VPs structural genes
- NS non-structural genes
- plasmid pJA The plasmid carrying the NS and VP genes without the ITRs sequences, named plasmid pJA, is derived from the plasmid pBRJ-H by deletion of the inverted terminal repeat regions (ITRs) at the Fspl site (Li, 1993, PhD Thesis of the University Jardin II pp.124).
- ITRs inverted terminal repeat regions
- a deletion of the structural genes was carried out by digestion of the plasmid pJA with the BamHI and HpaI restriction enzymes (position 38 bp at 2162 bp) and then by religation with T4 DNA ligase (INVITROGEN, USA), thus generating the plasmid pJAAVP ( Figure 1.a).
- a plasmid carrying only the structural genes was obtained by deleting the nonstructural genes (NS) by digesting the plasmid pJA with the restriction enzymes Bsml and KpnI (position 2732 bp at 521 1 bp). ) generating the plasmid pJAANS ( Figure 1.b).
- ITRs inverted terminal repeat regions
- constructs carrying a recombinant genome have been developed to determine the minimum ITR sequences necessary for encapsidation. Initially, constructions carrying only the ITRs are obtained by digestion of the plasmid pBRJ-H at the BstEll sites. (position 337 bp at 6028 bp) or BamHI (position 446 bp at 5920 bp), thus deleting the part of the viral genome coding for NS and VP.
- a first recombinant vector was constructed by cloning an A3GFP expression cassette containing the gene encoding the "Green Fluorescent Protein” (GFP) under control of the Actin promoter of Bombyx mori A3 (SEQ ID NO: 6 ) at the restriction sites of the BstEII and BamHI enzymes of plasmid pBRJ-H whose viral genome has been deleted.
- the A3GFP expression cassette used is derived from plasmid pASA3-GFP, lepidopteran expression vector (Bossin, 1998, Thesis of adjoin II University, pp. 240) ( Figure 1.c).
- the vector generated thus constitutes one of the recombinant genomes to be encapsidated.
- the corresponding constructs are named pITR-A3GFP-2? StEII and pITR-A3GFP-5a / wHI.
- the recombinant plasmid vector containing the gene coding for the red fluorescent protein, DsRed2 was constructed from the pITR-A3GFP-.Z3 ⁇ 4tEII vector by deletion of the GFP reporter gene at the BamHI and NotI restriction sites.
- the DsRed2 gene was amplified, from the plasmid pDsRed2 (CLONTECH, USA), by PCR using primers integrating the BamHI and NotI restriction sites and then inserted in place of the GFP gene. This construction was named pITR-A3DsRed2-55tEII.
- the recombinant plasmid vector containing the gene coding for the scorpion neurotoxin Androctonus australis (AaH-IT1) (SEQ ID No. 5) obtained from the plasmid pcD-Tox (Bougis et al., 1989) was constructed according to the same method only for the vector pITR-A3DsRed2-i? s EII.
- the generated vector has been named pITR-A3 AaH-ITl -IstEII.
- the recombinant JcDNV particles were produced by multi-transfection into insect cells.
- A3AaH-IT1 at a ratio of 1: 1 or 1: 2;
- Tri-transfection with the pJAANS complementation vectors carrying the VP and pJAAVP genes carrying the NS genes as well as with a recombinant encapsidation vector pITR-A3GFP or pITR-A3DsRed2 or pITR-A3AaH-IT1, in a ratio of 1: 1: 1 or 1: 1: 2.
- Transfection efficiency was determined by fluorescence microscopic observation of transfected Ld cells with the pITR-A3GFP construct and shown to be at most 30%.
- part of the previous suspension is deposited on a microscope to carry out negative staining (phosphotungstic acid 2%, pH 7.0).
- a stage of visualization in Transmission Electron Microscopy (TEM) made it possible to confirm the production of viral particles by the cells.
- the viral DNA was extracted from the viral particles and then digested with DpnI.
- a PCR amplification step was subsequently performed on the digested DNAs using primers specific for the A3GFP expression cassette, sense primers: 5'-ATTTACTAAggTgTgCTCgAAC AgT-3 '(SEQ ID NO: 17) and primer antisense: 5'-TACTTgTAC AgCTCgTCCATgCCg-3 '(SEQ ID NO: 18).
- the results show a specific amplification from DNA extracted from viral particles and no amplification in plasmid control (pASA3-GFP) digested with DpnI.
- the virus particle suspensions obtained in Example 3 were used to infect Ld cells.
- Ld cells cultured in complete TC100 medium, were prepared in 96-well plate so as to be 80% confluent at 24 hours of culture. The next day, the cell culture medium was removed and 50 ⁇ of purified virus particles were added. The cells are incubated for 1 h at 26 ° C with the inoculum. Subsequently, complete TC100 medium was added and the cells were kept in an oven at 26 ° C until observation.
- Example 5 In order to confirm the non-replicative nature of the isolated virus particles, the culture supernatant of the cells infected in Example 5 was harvested and subjected to the same protocol as that of Example 3 (clarification, ultracentrifugation and resuspension of the pellet in PBS ). One volume of this suspension was used to infect new Ld cells with a protocol identical to that used in Example 4. In the same way, the fluorescence of Ld cells was followed regularly after infection.
- the haemocytes were taken at a false paw with a 0.2 mm diameter needle.
- the haemolymph of each larva was recovered and cultured in 96-well plate with 100 ⁇ l of culture medium TC100, 1% antibiotics and 0.03 ⁇ PTU (N-phenylthiourea). Haemocytes were observed at 4 h post-culture under a fluorescence microscope.
- the haemocytes of the GFP, DsRed, positive and negative control groups were observed under a fluorescence microscope as early as 4 hours after culturing (6 days PI). A fluorescent green and red signal was observed in some haemocytes of the larvae injected with the GFP and DsRed coding particles, respectively. No fluorescence was observed in the positive and negative controls.
- the tissues were mounted on slides and observed under a fluorescence microscope. A green and red specific fluorescence is observed in the tracheas of the larvae infected respectively by the recombinant particles GFP and DsRed. No specific fluorescence was observed in the tracheal larvae of the positive and negative control groups.
- Larvae infected with the recombinant particles were sacrificed at 6 days post-infection. The remaining portion of the larvae stored at -20 ° C was milled in PBS. The supernatants were clarified for 10 minutes at 5000 g and then injected at 10 ⁇ into larvae of Spodoptera frugiperda moth larvae aged 7 days after hatching using a microinjector. After injection, the larvae were fed on an artificial medium and kept in an oven at 26 ° C. for 6 days.
- the haemocytes were taken at the level of a false paw and the haemolymph of each larva was cultured in 96-well plate with 100 ⁇ l of culture medium TC100, 1% antibiotics and 0, 03 ⁇ PTU (N-phenylthiourea). Haemocytes were observed at 4 h post-culture under a fluorescence microscope.
- the larvae After recovery of the haemocytes, the larvae were partially dissected so as to isolate the following different tissues: the intestine, the tracheas, the nervous ganglia and the epidermis. The different organs were observed directly under a fluorescence microscope.
- the Baculovirus expression system is commonly used for the production of large quantities of recombinant proteins because of its ease of use and high level of expression.
- the principle of producing non-replicating recombinant Densovirus particles in the Baculovirus expression system is based on:
- JcDNV Junonia coenia Densovirus
- VP structural
- NS non-structural
- Complementation expression vectors carry the structural genes (VPs) under the control of a promoter or non-structural genes (NS) also under the control of a promoter without however carrying the ITRs sequences.
- VPs structural genes
- NS non-structural genes
- the expression vector carrying the NS genes without the ITRs sequences is obtained after PCR amplification of the NS sequences including the homologous P93 promoter, using primers integrating the NotI and XhoI restriction sites ( underlined sequences):
- P93_NS_pFastBAC_F 5 '- AT AAgCggCCgTT ATTgTgACCTCgTTTgA-3' (SEQ ID NO: 19) and
- NS_pBAC_R 5 '-CCgCTCgAgTT AA A ATgT AAT ATATTT ATT ATTC AAT AAA-
- the fragment obtained was inserted at the NotI-XhoI sites of the multi-cloning site of the pFastBac TM 1 expression vector.
- the expression of the nonstructural genes (NS) is made under the control of the homologous promoter P93.
- the expression vector carrying the VP genes without the ITRs sequences was obtained after PCR amplification of the VP sequences, using primers integrating the NotI and XhoI restriction sites (underlined sequences):
- the fragment obtained was inserted at the NotI-XhoI sites of the multi-cloning site of the pFastBac TM 1 expression vector.
- the expression vector named pFastBac-ITR-A3GFP, carries the ITRs regions of JcDNV flanking the A3-GFP expression cassette. This construction derives from the plasmid pITR-A3GFP-i3 ⁇ 4tEIi already described. Thus the sequence including the ITRs regions and the expression cassette was amplified by PCR using primers integrating the EcoRI and XhoI sites (underlined sequences):
- A3GFP_pFastBAC_F 5'-CCgGAATTCCgTgTATgAAATCTAACAATgCgCTC -3 '(SEQ ID NO: 23) and
- A3 GFP_pFastB AC_R 5'-CCgCTCgAggTACTgCCgggCCTCTTgCgggATg -3 '(SEQ ID NO: 24).
- the resulting fragment was inserted at the EcoRI-XhoI sites of the multi-cloning site of the pFastBac TM 1 expression vector.
- the expression vectors pFastBac-NS, pFastBac-VP and pFastBac-ITR-A3GFP were transformed into DH1OBac competent cells in order to generate the recombinant Bacmids (BAC-NS, BAC-VP and BAC-ITRA3GFP).
- the amplification of recombinant Baculoviruses and the generation of high-titre viral stocks are made from low-level stocks by serial passage into insect cells.
- the viral titer of each recombinant Baculovirus is also estimated by quantitative PCR and then confirmed by plate assay.
- the high-titre recombinant Baculovirus stocks are used for multi-infected Sf9 insect cells.
- Non-replicating recombinant Densovirus particles as well as Baculoviruses are produced during this infection.
- DNVs particles Purification of the DNVs particles is done by heat. In fact, Baculoviruses are enveloped viruses and therefore not very resistant to heat, unlike Densoviruses, which are non-enveloped viruses. This purification process is used routinely by the GENETHON teams. After purification, the particles produced are characterized and validated according to the same method as previously used.
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Abstract
Description
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Priority Applications (6)
Application Number | Priority Date | Filing Date | Title |
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EP11784941.4A EP2635688A1 (fr) | 2010-11-02 | 2011-11-02 | Vecteurs derives de densovirus pour le transfert de gene chez l'insecte |
CA2818080A CA2818080A1 (fr) | 2010-11-02 | 2011-11-02 | Vecteurs derives de densovirus pour le transfert de gene chez l'insecte |
BR112013010874A BR112013010874A2 (pt) | 2010-11-02 | 2011-11-02 | vetor, célula, método para produção de partículas de densovírus de junonia coenia (jcdnv), célula, kit para produção de partículas de desevírus de junonia coenia, partícula de densovírus e sua utilização, composição e sua utilização e processo de tratamento de plantas |
CN2011800582488A CN103328638A (zh) | 2010-11-02 | 2011-11-02 | 用于在昆虫中进行基因转移的源自浓核病毒的载体 |
US13/882,726 US20140142164A1 (en) | 2010-11-02 | 2011-11-02 | Densovirus-derived vector for gene transfer in insects |
MA35863A MA34639B1 (fr) | 2010-11-02 | 2013-05-02 | Vecteurs derives de densovirus pour le transfert de gene chez l'insecte |
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FR1004292A FR2966841A1 (fr) | 2010-11-02 | 2010-11-02 | Vecteurs derives de densovirus pour le transfert de gene chez l'insecte |
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PCT/EP2011/005516 WO2012059217A1 (fr) | 2010-11-02 | 2011-11-02 | Vecteurs derives de densovirus pour le transfert de gene chez l'insecte |
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US (1) | US20140142164A1 (fr) |
EP (1) | EP2635688A1 (fr) |
CN (1) | CN103328638A (fr) |
BR (1) | BR112013010874A2 (fr) |
CA (1) | CA2818080A1 (fr) |
CL (1) | CL2013001208A1 (fr) |
FR (1) | FR2966841A1 (fr) |
MA (1) | MA34639B1 (fr) |
WO (1) | WO2012059217A1 (fr) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
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CN116375818A (zh) * | 2023-02-28 | 2023-07-04 | 华南农业大学 | 携带mApple荧光报告基因的重组H5N8亚型禽流感病毒的构建及其应用 |
Families Citing this family (1)
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WO2018060881A1 (fr) * | 2016-09-27 | 2018-04-05 | University Of Florida Research Foundation, Inc. | Administration de toxines d'insectes induites par une protéine d'enveloppe densovirus |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
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EP0319418A1 (fr) * | 1987-12-03 | 1989-06-07 | Roussel-Uclaf | Nouveaux plasmides provoquant des densonucléoses, leur procédé d'obtention et leur application dans la lutte biologique contre les insectes ravageurs |
FR2678948A1 (fr) * | 1991-07-11 | 1993-01-15 | Agronomique Inst Nat Rech | Nouveaux vecteurs d'expression et d'integration derives des densovirus, et leurs applications. |
WO2007084773A2 (fr) * | 2006-01-20 | 2007-07-26 | University Of North Carolina At Chapel Hill | Production accrue de vecteurs infectieux du parvovirus dans des cellules d'insectes |
Family Cites Families (3)
Publication number | Priority date | Publication date | Assignee | Title |
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US5547869A (en) * | 1987-12-03 | 1996-08-20 | Roussel Uclaf | Plasmids |
CA2200835A1 (fr) * | 1994-09-23 | 1996-03-28 | Frederick M. Boyce | Utilisation d'un virus a adn non mammalien en vue de l'expression d'un gene exogene dans une cellule mammalienne |
CA2467959C (fr) * | 2001-11-09 | 2009-03-10 | Robert M. Kotin | Production d'un virus adeno-associe dans des cellules d'insectes |
-
2010
- 2010-11-02 FR FR1004292A patent/FR2966841A1/fr not_active Withdrawn
-
2011
- 2011-11-02 CN CN2011800582488A patent/CN103328638A/zh active Pending
- 2011-11-02 WO PCT/EP2011/005516 patent/WO2012059217A1/fr active Application Filing
- 2011-11-02 BR BR112013010874A patent/BR112013010874A2/pt not_active IP Right Cessation
- 2011-11-02 CA CA2818080A patent/CA2818080A1/fr not_active Abandoned
- 2011-11-02 US US13/882,726 patent/US20140142164A1/en not_active Abandoned
- 2011-11-02 EP EP11784941.4A patent/EP2635688A1/fr not_active Withdrawn
-
2013
- 2013-05-02 CL CL2013001208A patent/CL2013001208A1/es unknown
- 2013-05-02 MA MA35863A patent/MA34639B1/fr unknown
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
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EP0319418A1 (fr) * | 1987-12-03 | 1989-06-07 | Roussel-Uclaf | Nouveaux plasmides provoquant des densonucléoses, leur procédé d'obtention et leur application dans la lutte biologique contre les insectes ravageurs |
FR2678948A1 (fr) * | 1991-07-11 | 1993-01-15 | Agronomique Inst Nat Rech | Nouveaux vecteurs d'expression et d'integration derives des densovirus, et leurs applications. |
WO2007084773A2 (fr) * | 2006-01-20 | 2007-07-26 | University Of North Carolina At Chapel Hill | Production accrue de vecteurs infectieux du parvovirus dans des cellules d'insectes |
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"Techniques in the Life Sciences, Setting Up and Maintenance of Tissue and Cell Cultures", 1985, ELSEVIER SCIENTIFIC PUBLISHERS IRELAND, LTD., pages: C109,1 - C109,28 |
AFANASIEV B ET AL: "Densovirinae as gene transfer vehicles.", CONTRIBUTIONS TO MICROBIOLOGY, vol. 4, 2000, pages 33 - 58, XP009148110, ISSN: 1420-9519 * |
BOSSIN, THÈSE DE L'UNIVERSITÉ MONTPELLIER II, 1998, pages 240 |
CORSINI J ET AL: "Autonomous parvovirus and densovirus gene vectors.", ADVANCES IN VIRUS RESEARCH, vol. 47, 1996, pages 303 - 351, XP009148117, ISSN: 0065-3527 * |
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GOODWIN ET AL., IN VITRO, vol. 14, no. 6, 1978, pages 485 - 94 |
JIANG H ET AL: "Genetic engineering of Periplaneta fuliginosa densovirus as an improved biopesticide", ARCHIVES OF VIROLOGY ; OFFICIAL JOURNAL OF THE VIROLOGY DIVISIONOF THE INTERNATIONAL UNION OF MICROBIOLOGICAL SOCIETIES, vol. 152, no. 2, 23 October 2006 (2006-10-23), SPRINGER-VERLAG, VI, pages 383 - 394, XP019474840, ISSN: 1432-8798 * |
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PEARSON; LIPMAN, PROC. NATL. ACD. SCI. USA, vol. 85, 1988, pages 2444 |
REN XIAOXIA ET AL: "Viral paratransgenesis in the malaria vector Anopheles gambiae.", PLOS PATHOGENS, vol. 4, no. 8, E1000135, 2008, pages 1 - 8, XP002636151, ISSN: 1553-7374 * |
ROLLING, THÈSE DE DOCTORAT DE L'UNIVERSITÉ D'AIX-MARSEILLE II, 1992, pages L53 |
SANBROOK ET AL.: "Molecular Cloning: A Laboratory Manual", 1989, COLD SPRING HARBOR LABORATORY PRESS |
SMITH; WATERMAN, AD. APP. MATH., vol. 2, 1981, pages 482 |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN116375818A (zh) * | 2023-02-28 | 2023-07-04 | 华南农业大学 | 携带mApple荧光报告基因的重组H5N8亚型禽流感病毒的构建及其应用 |
Also Published As
Publication number | Publication date |
---|---|
CL2013001208A1 (es) | 2014-07-25 |
US20140142164A1 (en) | 2014-05-22 |
BR112013010874A2 (pt) | 2016-07-12 |
EP2635688A1 (fr) | 2013-09-11 |
CN103328638A (zh) | 2013-09-25 |
CA2818080A1 (fr) | 2012-05-10 |
MA34639B1 (fr) | 2013-11-02 |
FR2966841A1 (fr) | 2012-05-04 |
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