WO1996030512A1 - Systeme d'expression conditionnel - Google Patents
Systeme d'expression conditionnel Download PDFInfo
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- WO1996030512A1 WO1996030512A1 PCT/FR1996/000477 FR9600477W WO9630512A1 WO 1996030512 A1 WO1996030512 A1 WO 1996030512A1 FR 9600477 W FR9600477 W FR 9600477W WO 9630512 A1 WO9630512 A1 WO 9630512A1
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- C12N2830/001—Vector systems having a special element relevant for transcription controllable enhancer/promoter combination
- C12N2830/002—Vector systems having a special element relevant for transcription controllable enhancer/promoter combination inducible enhancer/promoter combination, e.g. hypoxia, iron, transcription factor
- C12N2830/003—Vector systems having a special element relevant for transcription controllable enhancer/promoter combination inducible enhancer/promoter combination, e.g. hypoxia, iron, transcription factor tet inducible
Definitions
- the present invention relates to a new system for the conditional expression of genes. It also relates to the use of this system in gene or cell therapy, to very selectively target the expression of genes of interest.
- Gene and cell therapies consist in correcting a deficiency or an anomaly (mutation, aberrant expression, etc.) or in ensuring the expression of a protein of therapeutic interest by introducing genetic information into the affected cell or organ. .
- This genetic information can be introduced either ex vivo in a cell extracted from the organ, the modified cell then being reintroduced into the body (cell therapy), or directly in vivo in the appropriate tissue (gene therapy).
- Different techniques exist for performing gene transfer including various transfection techniques involving chemical or biochemical, natural or synthetic vectors such as DNA and DEAE-dextran complexes (Pagano et al., J. Virol.
- promoters have been described in the literature, such as the promoter of genes coding for pyruvate kinase, villin, GFAP, the promoter of the intestinal fatty acid binding protein, the promoter of ⁇ actin of smooth muscle cells, or the promoter of the genes of apo-AI, apo-AII, human albumin, etc.
- these promoters have certain drawbacks and in particular they present a certain transcriptional background noise which can be troublesome for the expression of toxic genes and they are limited to certain cells and therefore cannot be used for any application.
- the present invention now describes a novel conditional gene expression system, which is particularly selective and efficient.
- One of the advantageous characteristics of the system of the invention lies in its capacity to express a gene not as a function of a cell type, but as a function of the presence of a particular cellular element or of a particular physiological situation.
- This system makes use of bispecific chimeric molecules comprising a domain capable of selectively binding a defined DNA sequence and a detector domain capable of specifically binding a transactivator or a transactivator complex.
- a first aspect of the present invention lies more particularly in the creation and expression of chimeric bispecific molecules comprising a domain capable of selectively binding a defined DNA sequence and a domain capable of specifically binding a transactivator or transrepressor or a transactivator complex or transrepressor.
- Another aspect of the present invention resides in a nucleic acid sequence coding for a chimeric molecule as defined above. before, as well as a whole expression vector comprising said nucleic sequence.
- Another aspect of the invention consists of a conditional gene expression system comprising (i) a chimeric molecule as defined above and (ii) an expression cassette comprising a regulatory sequence, a minimal promoter (including activity depends on the presence of a transactivator) and said gene.
- Another aspect of the invention also resides in an expression vector comprising - a nucleic sequence coding for a chimeric molecule as defined above and
- conditional expression system of the invention is particularly suitable for use in gene or cell therapy, for very selective targeting of the expression of genes of interest.
- One of the components of the system of the invention therefore consists of particular bispecific chimeric molecules comprising a domain capable of selectively binding a defined DNA sequence and a domain capable of specifically binding a transactivator or a transactivator complex.
- the bispecificity of the molecules of the invention resides on the one hand in their capacity to link a defined DNA sequence (generally designated regulatory or operator sequence) and on the other hand in their capacity to specifically recruit a transactivating or transrepressant protein domain allowing induce or suppress gene expression.
- the invention relates in particular to the development of bispecific chimeric molecules allowing the recruitment of any transcriptional factor whose activation or inactivation leads to a situation pathophysiological.
- the bispecific chimeric molecules according to the invention thus allow the selective recruitment of transcriptional transactivators specific for a pathophysiological state, the binding of these transcriptional factors to promoters by means of a binding of these molecules to defined DNA sequences. located near these promoters (regulatory or operator sequences), and thus the conditional expression of genes (Figure 1).
- the invention also relates to the development of chimeric bispecific molecules allowing the recruitment not of a molecule carrying a transactivating domain but of a transcriptional transactivating complex, that is to say of a complex formed between a target molecule present in a cell and a molecule carrying a transactivating domain ( Figure 2).
- the transactivator complex is preferably formed by means of a second bispecific chimeric molecule comprising a transactivator domain and a domain for selective binding to said cell molecule.
- the binding of this second molecule allows the formation of a transcriptional transactivating binary complex, which complex is then recruited by the detector system of the invention.
- the binding of this ternary complex near promoters thus allows the regulated expression of genes.
- This type of construction advantageously makes it possible to extend the conditions of use of the system of the invention to the detection of any intracellular molecule devoid of transactivating domain, whether it is an endogenous molecule or a molecule of infectious origin for example.
- the system of the invention thus makes it possible, thanks to a very selective detection system ("sensor") to activate the expression of genes of interest only in the presence of target proteins. They can be transcriptional factors appearing during physiological or pathophysiological situations, or any endogenous molecule or of infectious origin for example.
- the system of the invention indeed contains a very sensitive and very selective detector element making it possible to condition the expression of a gene to the presence, the appearance or the disappearance of any molecule in a cell.
- the term transactivator designates any transactivating factor for transcription or any protein comprising a transcriptional transactivating domain.
- the transactivating complex designates the complex formed between a molecule present in a cell and a bispecific molecule of the invention comprising a transactivating domain and a specific binding domain for said molecule.
- the expression system of the invention can be used to recruit any transactivating protein or carrying a transactivating domain, and in particular any protein of viral, parasitic, mycobacterial or cellular origin having a transcriptional transactivating activity.
- any transactivating protein or carrying a transactivating domain and in particular any protein of viral, parasitic, mycobacterial or cellular origin having a transcriptional transactivating activity.
- the transcriptional factors of viral origin there may be mentioned in particular the Tat protein of the HIV virus, the E6 / E7 proteins of the papilloma virus or also the EBNA protein of the Epstein Barr virus.
- the conditional expression system according to the invention advantageously allows a detection of this physiological situation (the appearance of these specific transactivators of viral infection) and the induction of a selective expression of given gene (s) .
- the cellular proteins mention may preferably be made of the mutated or wild-type p53 protein.
- the p53 protein consists of 393 amino acids. In its wild form, it is a tumor suppressor capable of negatively regulating growth and cell division.
- This activity is linked to the presence of a transcriptional transactivator domain in the structure of the p53 protein, located in the N-terminal region of the protein (residues 1-100 approximately).
- wild p53 is also capable of inducing apoptosis (Yonish-Rouach et al., Nature, 352, 345-347, 1991). These properties appearing in stressful situations where the integrity of cellular DNA is threatened, p53 has been suggested to be a "guardian of the genome".
- the system of the invention can also be used to induce selective expression of gene (s) by detection of any target molecule present in a cell.
- the detected protein is preferably a protein appearing in a cell in abnormal situations (infection, hyperproliferation, etc.).
- viral proteins such as proteins of structure or function of a virus, and in particular of the HIV virus, hepatitis, herpes, etc.
- proteins specific to a state of cellular hyperproliferation such as in particular the proteins myc, fos, jun, cyclins, etc.
- One of the properties of the chimeric molecules of the invention therefore lies in their ability to bind to specific regions of DNA (regions regulators or operator). This bond makes it possible to bring the transactivating domain close to the promoter and therefore to activate the expression of a gene placed under the control of said promoter.
- the domain capable of selectively binding a defined DNA sequence present in the molecules of the invention is essentially of protein origin. More preferably, this domain derives from a prokaryotic or eukaryotic protein capable of interacting with DNA sequences. Numerous genetic and structural studies have now made it possible to precisely define, within proteins interacting with double-stranded DNA sequences, the domains responsible for these interactions.
- tetracycline repressor of E.coli is a protein of about 210 amino acids.
- tetR negatively controls the transcription of genes mediating resistance to this antibiotic within the tet operon.
- the tetR repressor binds to DNA at the level of a specific sequence (designated operator sequence or Tetop) and represses the transcription of the resistance gene.
- the tetR repressor no longer binds to the tetop operator allowing a constitutive transcription of the gene (Hillen.W and Wissmann.A. (1989) in Protein-Nucleic Acid Interaction. Topics in Molecular and Structural Biology.eds, Saenger.W. And Heinemann.U. (Macmillan, London), Vol. 10, pp. 143-162).
- the tetR sequence has been published (it is reproduced in particular in WO94 / 04682).
- the specific double-strand DNA sequence for binding of tetR to DNA (Tetop) is composed of the following motif: TCTCTATCACTGATAGGGA (SEQ ID No. 1). This pattern can be repeated several times to increase the affinity and efficiency of the system. So the regulatory sequence can include up to 10 patterns and preferably contains 2 patterns (Tetop2) or 7 patterns (Tetop7) (see Figure 3).
- Cro protein was originally defined as a regulator of the expression of the repressor Cl (Eisen.H. Et al. (1970) PNAS 66, pp855). Cloning of the cro gene made it possible to identify a protein of 66 amino acids (SEQ ID No. 21; Roberts; T et al. (1977) Nature 270, pp274). Cro exercises its physiological role by preferentially attaching itself to the operator OR3 of Lambda.
- the specific double-strand DNA sequence for binding of Cro to DNA (region designated OR3) is composed of the following bases:
- the proteins or domains derived from the STAT, p53 or NFkB proteins are preferred to use for the construction of the molecules of the invention.
- the proteins or domains derived from the STAT, p53 or NFkB proteins are preferred to use for the construction of the molecules of the invention.
- Concerning the p53 protein, its DNA binding domain is located in the central region of the protein and, more precisely, in the region between amino acids 102 to 292 (Pavletich et al., Genes & Dev. 7 ( 1993) 2556).
- the domain capable of selectively binding a defined DNA sequence present in the molecules of the invention is preferably derived from a prokaryotic or eukaryotic protein capable of interacting with a region of double-stranded DNA.
- the domain used for the construction of the molecules of the invention can consist of the whole of the protein or of a fragment thereof comprising the region of interaction with DNA. This domain has been identified for various proteins and in particular TetR (see for example Berens et al., J. Biol. Chem. 267 (1992) 1945). It can also consist of a derivative of this protein or of the fragment having retained the properties of DNA linkage.
- Such derivatives are in particular proteins having modifications of one or more amino acids, for example to allow their fusion with the other domains of the molecules of the invention, prepared according to conventional techniques of molecular biology.
- Derivatives of the TetR and Cro proteins for example have been described in the literature, having point mutations and / or deletions (Hecht et al., J. Bact. 175 (1993) p. 1206; Altschmied et al., EMBO J 7 (1988) 4011; Baumeister et al., Proteins 14 (1992) 168; Hansen et al., J. Biol. Chem. 262 (1987) 14030).
- the binding capacity of these derivatives to a defined DNA sequence can then be tested by incubating the derivative prepared with the regulatory sequence and detecting the complexes formed.
- the derivatives can also be proteins with improved DNA binding properties (specificity, affinity, etc.).
- the domain capable of selectively binding a defined DNA sequence present in the molecules of the invention is derived from a prokaryotic protein.
- This type of construction is particularly advantageous since these proteins, of non-human origin, recognize double stranded DNA sites of at least 14 nucleotides. The probability of finding the same sequence within the human genome is almost zero and therefore the expression system obtained is all the more selective.
- the domain capable of selectively binding a defined DNA sequence present in the molecules of the invention is derived from the proteins tetR or Cro. It is particularly advantageous to use the complete tetR or Cro proteins (SEQ ID No. 21).
- the domain capable of specifically binding the transcriptional transactivator or the transcriptional transactivator complex present in the molecules of the invention can be of different types. It may in particular be an oligomerization domain in the case where the transactivator or the targeted transactivator complex also has such a domain. It can also be any synthetic or natural domain known to interact with said transactivator or transactivator complex. It may also be an antibody or a fragment or derivative of an antibody directed against the transactivator or transactivator complex.
- oligomerization domains which can be used in the context of the invention, mention may be made more particularly of leucine-zippers, SH2 domains or SH3 domains for example.
- Leucine-zippers are amphipatic ⁇ -helices which contain 4 or 5 leucines every 7 amino acids. This periodicity allows the location of leucines at approximately the same position on the ⁇ helix. Dimerization is underpinned by hydrophobic interactions between the side chains of leucines from two contiguous zipper domains (Vogt et al., Trends In Bioch. Science 14 (1989) 172).
- the SH2 domains are known to interact with specific peptide sequences phosphorylated in tyrosine.
- the SH3 domains can be used to form an oligomer with any transactivator or transactivator complex comprising the corresponding proline-rich peptide (Pawson et al., Current Biology 3 (1993) 434). It is also possible to use regions of proteins known to induce oligomerization, such as in particular the C-terminal region of the p53 protein. The use of this region makes it possible to selectively recruit the p53 proteins present in a cell. Preferably, in the context of the invention, a region of p53 between amino acids 320-393 (SEQ ID No. 3), 302-360 or 302-390 is used.
- a specific binding domain to the preferred transcriptional transactivator of the invention consists of an antibody or an antibody fragment or derivative.
- the fragments or derivatives of antibodies are for example the Fab or F (ab) ′ 2 fragments, the VH or VL regions of an antibody or also single chain antibodies (ScFv) comprising a VH region linked to a VL region by a arms.
- This type of domain is particularly advantageous since it can be directed against any molecule.
- Antibodies molecules of the immunoglobulin superfamily, are made up of different chains (2 heavy (H) and 2 light (L)) themselves made up of different domains (variable domain (V) junction domain (J), etc.).
- the transactivator binding domain or transactivating complex present in the molecules of the invention advantageously consists of a fragment or derivative of antibodies comprising at least the binding site of the antigen.
- This fragment can be either the variable domain of a light (V
- the single chain antibodies used for the construction of the molecules of the invention consist of a peptide corresponding to the binding site of the variable region of the light chain of an antibody linked by a peptide arm to a peptide corresponding to the binding site of the variable region of the heavy chain of an antibody.
- the construction of nucleic acid sequences encoding such modified antibodies according to the invention has been described for example in patent US Pat. No. 4,946,778 or in applications WO94 / 02610, WO94 / 29446. It is illustrated in the examples.
- a preferred construct according to the present invention comprises a binding domain to a p53 protein. It is more preferably an antibody derivative directed against a p53 protein. A particular embodiment consists of a single chain antibody directed against p53. AT As a specific example, the ScFv of sequence SEQ ID No. 4 is used, the construction of which is described in the examples.
- the DNA binding domain and the transactivator binding domain are generally linked together via an arm.
- This arm generally consists of a peptide conferring sufficient flexibility for the two domains of the molecules of the invention to be able to function independently.
- This peptide is generally composed of uncharged amino acids, which do not interfere with the activity of the molecules of the invention, such as for example glycine, serine, tryptophan, lysine or proline.
- the arm generally comprises from 5 to 30 amino acids and, preferably, from 5 to 20 amino acids. Examples of peptide arms which can be used for the construction of the molecules of the invention are for example:
- Preferred examples of a molecule according to the invention are in particular the following molecules: a) ScFv-tag-Hinge-TET or Cro (FIG. 5A) This type of molecule comprises:
- sequence SEQ ID No. 7 a tag peptide sequence recognized by a monoclonal antibody allowing the immunological detection of the molecule.
- This sequence can for example be the VSV epitope of sequence MNRLGK (SEQ ID No. 7) whose coding sequence is ATGAACCGGCTGGGCAAG (SEQ ID No. 7), or the myc epitope of sequence EQKLISEEDLN (SEQ ID No. 8) the coding sequence is GAACAAAAACTCATCTCAGAAGAGGATCTGAAT (SEQ ID No. 8), recognized by the antibody 9E10.
- This type of molecule simply comprises a binding domain to a transactivator consisting of a single chain antibody and a DNA binding domain consisting of the TET or Cro protein. It has neither arms nor tag sequence. In this construction, the transactivator binding domain is located in the N-terminal part of the molecule and the DNA binding domain in the C-terminal part.
- TET or Cro-ScFv Figure 5D
- This type of molecule is similar to type c) above. The difference essentially lies in the arrangement of the domains: the binding domain to the transactivator is now located in the C-terminal part of the molecule and the DNA binding domain in the N-terminal part.
- This type of molecule is similar to type a), except for the transactivator binding domain which is replaced by the oligomerization domain with the p53 protein of sequence SEQ ID No. 3. This molecule makes it possible to recruit the p53 proteins mutated cells appearing in tumor cells.
- Oligom-Hinge-TET or Cro Figure 5B
- This type of molecule is similar to type c), except for the transactivator binding domain which is replaced by the oligomerization domain with the p53 protein of sequence SEQ ID No. 3. i) TET or Cro-Oligom ( Figure 5D) This type of molecule is similar to type d), except for the transactivator binding domain which is replaced by the oligomerization domain with the p53 protein of sequence SEQ ID No. 3. j) TET or Cro -Hinge-Oligom ( Figure 5E)
- This type of molecule is similar to type e), except for the transactivator binding domain which is replaced by the oligomerization domain with the p53 protein of sequence SEQ ID No. 3.
- the peptide arm can be easily replaced by the sequence (G4S) 3 (SEQ ID No. 5).
- nucleic acid sequence coding for a chimeric molecule as defined above. It is advantageously a DNA sequence, in particular cDNA. It can also be an RNA.
- the sequences of the invention are generally constructed by assembling, within a cioning vector, sequences coding for the different fields according to the conventional techniques of molecular biology.
- the nucleic acid sequences of the invention can optionally be modified chemically, enzymatically or genetically, with a view to generating stabilized domains, and / or multifunctional domains, and / or of reduced size, and / or with the aim of promoting their location in this or that intracellular compartment.
- nucleic acid sequences of the invention can include sequences encoding nuclear localization peptides (NLS).
- NLS nuclear localization peptides
- nucleic acid sequences according to the invention advantageously form part of an expression vector, which can be of plasmid or viral nature.
- Another object of the present invention resides in a fusion protein comprising a transcriptional transactivating domain and a binding domain specific to a given molecule, optionally linked by a peptide arm, as well as any nucleic acid sequence coding for such a fusion.
- the transactivating domain can come from any transcriptional transactivating protein, such as p53, VP16, EBNA, E6 / E7, Tat, etc.
- Another subject of the invention consists of a conditional gene expression system comprising:
- An expression cassette comprising a regulatory sequence, a minimal transcriptional promoter and said gene.
- the expression cassette contains the elements necessary for activation of gene expression by the transactivator or transactivator complex recruited by the bispecific molecule.
- the regulatory sequence is the DNA binding sequence of the expressed chimeric molecule.
- the regulatory sequence comprises the sequence SEQ ID No. 1 or a derivative thereof, optionally repeated several times. It is preferably the sequence op2 (comprising 2 repeated Tetop motifs) or Op7 (comprising 7 repeated Tetop motifs such as described for example in Weinmann et al., The Plant Journal 5 (1994) 559).
- the regulatory sequence comprises the sequence SEQ ID No.
- sequences SEQ ID No. 1 and 2 can be any sequence obtained by modification of a genetic nature (mutation, deletion, addition, repetition, etc.) and retaining the capacity to specifically bind a protein. Such derivatives have been described in the literature (Baumeister et al cited above, Tovar et al., Mol. Gen. Genêt. 215 (1988) 76, WO94 / 04672).
- the minimal transcriptional promoter is a promoter whose activity depends on the presence of a transactivator. Therefore, in the absence of the chimeric molecule, the promoter is inactive and the gene is little or not expressed. On the other hand, in the presence of the chimeric molecule, the recruited transactivator or transactivator complex makes it possible to induce the activity of the minimal promoter and thus the expression of the gene of interest.
- the minimum promoter generally consists of a TATA or INR box. These elements are in fact the minimum elements necessary for the expression of a gene in the presence of a transactivator.
- the minimal promoter can be prepared from any promoter by genetic modification.
- a candidate promoter As a preferred example of a candidate promoter, mention may be made of the promoter of the thymidine kinase gene. Interesting results have more precisely been obtained with a minimal promoter derived from the TK promoter composed of nucleotides -37 to +19.
- the minimal promoter can also be derived from human CMV. In particular, it can consist of the fragment between the nucleotides -53 to +75 or -31 to +75 of the CMV. Any conventional promoter can however be used such as for example the promoter of the genes coding for chloramphenicol acetyl transferase, ⁇ -galactosidase or even luciferase.
- the expression cassette advantageously consists of the following elements:
- a regulatory sequence a sequence comprising the sequence SEQ ID No. 1 or 2 or a derivative thereof, optionally repeated several times,
- TK thymidine kinase
- the minimal promoter consists of the region -37 to +19 of the promoter of the thymidine kinase gene.
- the expression cassette is chosen from cassettes of Tetop2.TK-Gene structure; Tetop7.TK-Gene and OR3.TK-Gene.
- nucleic acid sequence coding for a chimeric molecule and an expression cassette as defined above.
- the nucleic acid sequence coding for the chimeric molecule and the expression cassette can be inserted in the same orientation or in the opposite orientations.
- the vector may be of plasmid or viral nature.
- the viral vectors there may be mentioned more preferably the adenoviruses, the retroviruses, the herpes viruses or even the associated adeno viruses.
- the viruses according to the present invention are defective, that is to say incapable of replicating autonomously in the target cell.
- the genome of the defective viruses used in the context of the present invention is therefore devoid of at least the sequences necessary for the replication of said virus in the infected cell. These regions can be either eliminated (in whole or in part), or made non-functional, or substituted by other sequences and in particular by the sequences of the invention.
- the defective virus nevertheless retains the sequences of its genome which are necessary for the packaging of the viral particles.
- adenoviruses various serotypes, whose structure and properties vary somewhat, have been characterized.
- serotypes it is preferred to use, in the context of the present invention, human adenoviruses of type 2 or 5 (Ad 2 or Ad 5) or adenoviruses of animal origin (see application WO94 / 26914).
- adenoviruses of animal origin which can be used in the context of the present invention, mention may be made of adenoviruses of canine, bovine, murine origin (example: Mav1, Beard et al., Virology 75 (1990) 81), ovine, porcine , avian or even simian (example: after-sales service).
- the adenovirus of animal origin is a canine adenovirus, more preferably a CAV2 adenovirus [Manhattan strain or A26 / 61 (ATCC VR-800) for example].
- adenoviruses of human or canine or mixed origin are used.
- the genome of the recombinant adenoviruses of the invention comprises at least the ITRs and the packaging region of an adenovirus, and the nucleic acid sequence coding for a chimeric molecule and an expression cassette as defined above. before. More preferably, in the genome of the adenoviruses of the invention, the E1 region at least is non-functional.
- the viral gene considered can be made non-functional by any technique known to those skilled in the art, and in particular by total suppression, substitution (for example by the sequences of the invention), partial deletion, or addition of one or more bases in the gene (s) considered.
- the adenovirus according to the invention comprises a deletion in the E1 and E4 regions. According to another preferred embodiment, it comprises a deletion in region E1 at the level of which the region E4 and the sequences of the invention are inserted (Cf FR 94 13355).
- the defective recombinant adenoviruses according to the invention can be prepared by any technique known to those skilled in the art (Levrero et al., Gene 101 (1991) 195, EP 185 573; Graham, EMBO J. 3 (1984) 2917). In particular, they can be prepared by homologous recombination between an adenovirus and a plasmid carrying inter alia the DNA sequences of the invention (sequence coding for the chimeric molecule + expression cassette). Homologous recombination occurs after co-transfection of said adenovirus and plasmid in an appropriate cell line.
- the cell line used must preferably (i) be transformable by said elements, and (ii), contain the sequences capable of complementing the part of the genome of the defective adenovirus, preferably in integrated form to avoid the risks of recombination.
- a line mention may be made of the human embryonic kidney line 293 (Graham et al., J. Gen. Virol. 36 (1977) 59) which contains in particular, integrated into its genome, the left part of the genome an Ad5 adenovirus (12%) or lines capable of complementing the E1 and E4 functions as described in particular in applications No. WO 94/26914 and WO95 / 02697. Then, the adenoviruses which have multiplied are recovered and purified according to conventional techniques of molecular biology, as illustrated in the examples.
- AAV adeno-associated viruses
- the defective recombinant AAVs according to the invention can be prepared by cotransfection, in a cell line infected with a human helper virus (for example an adenovirus), of a plasmid containing the nucleic sequences of the invention (sequence coding for chimeric molecule + expression cassette) bordered by two inverted repeat regions (ITR) of AAV, and of a plasmid carrying the packaging genes (rep and cap genes) of AAV.
- a human helper virus for example an adenovirus
- a plasmid containing the nucleic sequences of the invention sequence coding for chimeric molecule + expression cassette bordered by two inverted repeat regions (ITR) of AAV
- ITR inverted repeat regions
- rep and cap genes packaging genes
- retroviruses are integrative viruses, selectively infecting dividing cells. They therefore constitute vectors of interest for cancer applications.
- the genome of retroviruses essentially comprises two LTRs, an encapsidation sequence and three coding regions (gag, pol and env).
- the gag, pol and env genes are generally deleted, in whole or in part, and replaced by a heterologous nucleic acid sequence of interest.
- These vectors can be produced from different types of retroviruses such as in particular MoMuLV ("murine moloney leukemia virus”; also designated MoMLV), MSV ("murine moloney sarcoma virus”), HaSV ("harvey sarcoma virus”) ; SNV ("spleen necrosis virus”); RSV ("rous sarcoma virus”) or the Friend virus.
- MoMuLV murine moloney leukemia virus
- MSV murine moloney sarcoma virus
- HaSV human moloney sarcoma virus
- SNV spleen necrosis virus
- RSV rous sarcoma virus
- Friend virus Friend virus
- a plasmid comprising in particular the LTRs, the encapsidation sequence and the sequences of the invention (sequence coding for the chimeric molecule + expression cassette) is generally constructed, then used to transfect a cell line known as packaging, capable of providing in trans retroviral functions deficient in the plasmid.
- packaging lines are therefore capable of expressing the gag, pol and env genes.
- Such packaging lines have been described in the prior art, and in particular the line PA317 (US4,861,719); the PsiCRIP line (WO90 / 02806) and the GP + envAm-12 line (WO89 / 07150).
- the recombinant retroviruses may include modifications at the level of the LTRs to suppress transcriptional activity, as well as extended packaging sequences, comprising a part of the gag gene (Bender et al., J. Virol. 61 (1987) 1639).
- the recombinant retroviruses produced are then purified by conventional techniques.
- FIG. 8 An example of construction of a defective recombinant virus according to the invention (retrovirus) is described in FIG. 8.
- This figure highlights a second advantage of the constructions according to the invention which resides in the absence of expression of the gene of interest in the packaging lines. These lines being devoid of the transactivator or transactivator complex recruited by the system of the invention, the promoter is inactive and the gene is not expressed in the production cell (FIG. 8A). It is only when the virus has effectively infected a target cell, that is to say a cell in which the transactivator or transactivator complex recruited by the system of the invention is present, that the gene is effectively expressed (FIG. 8B). This is particularly advantageous for the construction of viruses containing genes whose expression would be toxic to cells (Grb3-3, IL-2 genes, diphtheria toxin, etc.).
- a defective recombinant adenovirus or retrovirus indeed have properties which are particularly advantageous for the transfer of genes into tumor cells.
- non-viral vectors can also be used in the context of the invention.
- the conditional expression system according to the invention can in fact be incorporated into a non-viral agent capable of promoting the transfer and expression of nucleic acids in eukaryotic cells.
- Chemical or biochemical vectors represent an interesting alternative to natural viruses, in particular for reasons of convenience, safety and also by the absence of theoretical limit as regards the size of the DNA to be transfected.
- These synthetic vectors have two main functions, to compact the nucleic acid to be transfected and to promote its cellular fixation as well as its passage through the plasma membrane and, where appropriate, the two nuclear membranes.
- the non-viral vectors all have polycationic charges.
- cationic polymers of polylysine type (LKLK) n, (LKKL) n, polyethylene immine and DEAE dextran or else cationic lipids or lipofectants are the most advantageous. They have the property of condensing DNA and promoting its association with the cell membrane. Among the latter, mention may be made of lipopolyamines (lipofectamine, transfectam, etc.) and various cationic or neutral lipids (DOTMA, DOGS, DOPE, etc.).
- lipopolyamines lipofectamine, transfectam, etc.
- DOTMA cationic or neutral lipids
- the present invention also relates to any pharmaceutical composition comprising a vector as defined above.
- These compositions can be formulated for topical, oral, parenteral, intranasal, intravenous, intramuscular, subcutaneous, intraocular, etc. administration.
- the composition according to the invention contains pharmaceutically acceptable vehicles for an injectable formulation. They may in particular be saline solutions (monosodium phosphate, disodium, sodium chloride, potassium, calcium or magnesium, etc., or mixtures of such salts), sterile, isotonic, or dry compositions, in particular lyophilized, which, by addition as appropriate of sterilized water or physiological saline, allow the constitution of injectable solutes.
- retroviruses they may be advantageous to directly use packaging cells or cells infected ex vivo with a view to their reimplantation in vivo, possibly in the form of neo ⁇ organs (WO 94/24298).
- the vector doses used for the injection can be adapted according to different parameters, and in particular according to the mode of administration used, the pathology concerned or the duration of the treatment sought.
- the recombinant viruses according to the invention are formulated and administered in the form of doses of between 10 4 and 10 14 pfu / ml.
- doses of 10 to 10 10 pfu / ml can also be used.
- pfu plaque forming unit
- plaque forming unit corresponds to the infectious power of a suspension of virions, and is determined by infection of an appropriate cell culture, and measures, generally after 48 hours, the number of plaques of infected cells. The techniques for determining the pfu titer of a viral solution are well documented in the literature.
- the expression system according to the invention and the corresponding vectors are particularly useful for controlling the expression of genes of interest in the context of cell or gene therapies. They can thus be used to control the expression of any coding sequence of interest, and in particular of a sequence coding for a therapeutic product, whether it is a peptide, polypeptide, protein, ribonucleic acid, etc.
- the gene is a DNA sequence (cDNA, gDNA, synthetic, human, animal, plant DNA, etc.) coding for a protein product such as enzymes, blood derivatives, hormones, lymphokines: interleukins, interferons , TNF, etc (FR 9203120), growth factors, neurotransmitters or their precursors or synthetic enzymes, trophic factors: BDNF, CNTF, NGF, IGF, GMF, aFGF, bFGF, NT3, NT5, etc; apolipoproteins: ApoAl, ApoAIV, ApoE, etc (FR 93 05125), dystrophin or a minidystrophin (FR 9111947), tumor suppressor genes: p53, Rb, RaplA, DCC, k-rev, etc (FR 93 04745) , genes coding for factors involved in coagulation: Factors VII, VIII, IX, etc., or all or part of a natural or artificial immunoglobulin (Fab, Fab
- the gene of interest can also be an antisense sequence, the expression of which in the target cell makes it possible to control the expression of genes or the transcription of cellular mRNA.
- Such sequences can for example be transcribed, in the target cell, into RNAs complementary to cellular mRNAs and thus block their translation into protein, according to the technique described in patent EP 140308.
- the present invention is particularly suitable for the expression of sequences coding for toxic factors. It can be in particular poisons for cells (diphtheria toxin, pseudomonas toxin, ricin A, etc.) of product inducing sensitivity to an external agent (suicide genes: Thymidine kinase, cytosine deaminase, etc.) or even killer genes capable of inducing cell death (Grb3-3 (PCT / FR94 / 00542), anti-ras ScFv (W094 / 29446), etc.).
- the system of the invention indeed makes it possible to produce vectors, in particular viral containing these sequences without toxicity for the production cells, then then to induce the expression of these toxic molecules selectively in target cells having the desired transactivator or transactivator complex .
- This type of construction is therefore particularly suitable for strategies of antitumor therapies for example, in which the objective is to selectively destroy the affected cells.
- This system is also particularly interesting for the expression of cytokines, interferons, TNF or TGF for example, whose uncontrolled production can have very marked side effects.
- Figure 1 Representation of the conditional expression system according to the invention allowing the selective recruitment of a transactivator by means of an oligomerization domain (A) or a ScFv (B).
- Figure 2 Representation of the conditional expression system according to the invention allowing the selective recruitment of a transactivating complex.
- Figure 3 Representation of an expression cassette according to the invention comprising a regulatory sequence Tetop7, a minimal promoter (TATA box) and a gene (CAT).
- Figure 4 Representation of an expression cassette according to the invention comprising an OR3 regulatory sequence, a minimal promoter (box
- TATA TATA
- CAT a gene
- Figure 5 Representation of bispecific chimeric molecules according to the invention.
- Figure 6 Construction of DNA sequences coding for bispecific chimeric molecules according to the invention.
- Figure 7 Representation of control chimeric constructions.
- Figure 8 Structure and functioning of a viral vector (retrovirus) according to the invention.
- Figure 9 Study of the interaction between the hybrid molecules of the invention and a regulatory sequence.
- Figure 10 Study of the interaction between the hybrid molecules of the invention and different forms of the p53 protein.
- Figure 11 Demonstration of the activation of the Tet-Luc cassette in SAOS-2 cells.
- Figure 12 Demonstration of the activation of the Tet-Luc cassette in H358 cells.
- the enzymes were provided by New-England Biolabs (Beverly, MA).
- the DNA fragments are separated according to their size on 0.8 to 1.5% agarose gels, purified by GeneClean (BIO101, LaJolla CA) and incubated overnight at 14 ° C in Tris buffer. -HCI pH 7.4 50 mM, MgCl2 10 mM, DTT 10 mM, ATP 2 mM, in the presence of DNA ligase from phage T4.
- Amplification by PCR (Polymerase Chain Reaction), was also carried out according to Maniatis ei sJ., 1989, with the following specifications:
- oligonucleotides are synthesized using the chemistry of phosphoramidites protected in ⁇ by a cyanoethyl group, (Sinha __ al., 1984, Giles 1985), with the automatic DNA synthesizer Applied Biosystem model 394, (Applied Biosystem, Foster City CA) , according to the manufacturer's recommendations.
- the sequencing was carried out on double-stranded templates by the chain termination method using fluorescent primers.
- Example 1 Construction of expression cassettes comprising a regulatory sequence, a minimal transcriptional promoter and a gene.
- the plasmid pTETop7 / CAT contains the following elements (Figure 3):
- a regulatory sequence consisting of an interaction sequence with the tetracycline tetR repressor composed of 7 repeated Tetop motifs (SEQ ID No. 1);
- This plasmid was constructed by cloning the Smal-Bglll fragment of the plasmid pUHD10-7 (WO 94/29442) into the plasmid pKK232-8 (Pharmacia) previously digested with Smal and BamHI.
- the plasmid pOR3 / CAT contains the following elements ( Figure 4): - A regulatory sequence consisting of an OR3 sequence for interaction with the Cro repressor (SEQ ID No. 2);
- This plasmid was constructed in the following manner: The OR3 sequence for interaction with the Cro repressor was synthesized artificially. For this, the following two oligonucleotides were synthesized: Oligo 5533 (SEQ ID n ° 22): 5'-GATCCTATCACCGCAAGGGATAA-3 'Oligo 5534 (SEQ ID n ° 23): 3'-GATAGTGGCGTTCCCTATTTCGA-5'
- the toxic gene expression cassettes are obtained from the plasmids described above (1.1. And 1.2.) By replacing the CAT sequence with the sequence coding for the toxic product, preferably the Grb3-3 gene (PCT / FR94 / 00542), the thymidine kinase gene, the gene coding for diphtheria toxin or pseudomonas, etc.
- the CAT sequence preferably the Grb3-3 gene (PCT / FR94 / 00542), the thymidine kinase gene, the gene coding for diphtheria toxin or pseudomonas, etc.
- Example 2 Construction of a single chain antibody specific for D53 This single chain antibody was constructed according to the following protocol:
- the cDNAs coding for the VH and VL regions were obtained from the pAb421 hybridoma producing an anti-p53 antibody. For this, the total RNAs of the hybridoma were extracted and subjected to a reverse transcription reaction using random hexamers as primers. The use of this type of primer makes it possible to avoid the use of specific primers of immunoglobulins.
- the cDNA clones obtained are of sufficient length to clone the V regions. However, since they represent a small fraction of the total cDNA present, a prior amplification reaction must be carried out to produce sufficient DNA for cloning. For this, the cDNAs encoding the VH and VL regions were amplified separately.
- the primers used are oligonucleotides hybridizing at the opposite ends of the variable regions of each chain (H and L).
- the amplification product using the primers specific for heavy chains is a fragment of 340 pairs of bases approx.
- the amplification product using the primers specific to light chains is a fragment of approximately 325 base pairs.
- the cDNAs encoding the VH and VL regions of the antibody were assembled into a single chain using a nucleotide arm (L).
- the nucleotide arm was constructed such that one end binds to the 3 'end of the cDNA encoding the VH region and the other to the 5' end of the cDNA encoding the region VL.
- the sequence of the arm code for the peptide SEQ ID No. 5.
- the assembled sequence of approximately 700 bp contains, in the form of an Ncol-NotI fragment, the VH-L-VL sequence whose sequence is represented SEQ ID No. 4 (amino acids 9 to 241). This sequence also includes in C-terminal the tag sequence of myc (residues 256 to 266).
- Example 3 Construction of nucleic acid sequences encoding bispecific chimeric molecules containing a binding domain to a transactivator consisting of a single chain antibody (ScFv).
- the Ncol-NotI fragment containing the cDNA coding for the anti-p53 ScFv was first of all cloned into a plasmid of the pUC19 type.
- the sequence coding for the VSV (SEQ ID No. 7) or myc (SEQ ID No. 8) epitope is inserted downstream of the fragment (FIG. 6).
- TetR The sequence coding for TetR was obtained by amplification from a template plasmid carrying the tetR sequence using the following oligonucleotides:
- Oligo 5474 (SEQ ID # 10):
- oligonucleotides also provide the sequence coding for the Hinge peptide arm connecting the two functional domains of the molecules.
- the amplified fragment therefore contains the sequence coding for the peptide arm and for the tetR DNA binding domain.
- This fragment was cloned at the Xbal-EcoRI sites of the plasmid obtained above to generate a plasmid containing the sequence coding for the molecule ScFv-myc-Hinge-TetR
- oligonucleotides also provide the sequence coding for the Hinge peptide arm connecting the two functional domains of the molecules.
- the amplified fragment therefore contains the sequence coding for the peptide arm and for the DNA binding domain Cro.
- This fragment was cloned at the Xbal-EcoRI sites of the plasmid obtained above to generate a plasmid containing the sequence coding for the molecule ScFv-myc-Hinge-Cro
- plasmids were obtained from the plasmids described in 3.1. above by digestion with the enzymes Notl and Xbal. This digestion makes it possible to excise the fragment carrying the region coding for the tag myc.
- This example describes the construction of plasmids carrying a sequence coding for a bispecific chimeric molecule according to the invention devoid of arms and of tag sequence.
- plasmids were obtained from the plasmids described in 3.1. above by digestion with the enzymes Notl and BamHI. This digestion makes it possible to excise the fragment carrying the region coding for the myc tag and for the Hinge peptide arm.
- Example 4 Construction of nucleic acid sequences encoding bispecific chimeric molecules containing a binding domain to a transactivator consisting of an oligomerization domain.
- the cDNA encoding the oligomerization region of the p53 protein was obtained by PCR amplification on a plasmid carrying the cDNA of human wild p53 using the following oligonucleotides: Oligo 5535 ( SEQ ID # 14):
- CAGGCCATGGCATGAAGAAACCACTGGATGGAGAA (the underlined part represents an Ncol site)
- Oligo 5536 (SEQ ID n ° 15): CGTCGGATCCTCTAGATGCGGCCGCGTCTGAGTCAGGCCCTTC (Underlined part: BamHI site; Double-underlined: Xbal site: Bold: Notl site).
- the plasmids p53 320/393-myc-Hinge-TetR or Cro were obtained by cloning of the amplified fragment above in the form of an Ncol-NotI fragment in the corresponding sites of the plasmids described in Example 3.1 ., replacing the region coding for ScFv.
- Plasmids p53 320/393-Hinge-TetR or Cro were obtained by cloning the amplified fragment in 4.1. in the form of an Ncol-Xbal fragment in the corresponding sites of the plasmids described in Example 3.1., in substitution for the region coding for ScFv and the tag.
- Plasmids p53 320/393-TetR or Cro were obtained by cloning the amplified fragment in 4.1. in the form of an Ncol-BamHI fragment in the corresponding sites of the plasmids described in Example 3.1. , replacing the region coding for ScFv, the tag and the Hinge.
- the plasmids tetR or Cro-p53 320/393 ( Figure 5D) or tetR or Cro-Hinge-p53 320/393 ( Figure 5E) were obtained by cloning of fragments amplified by PCR on a plasmid carrying the cDNA of wild human p53 using oligos 5537/5539 or 5538/5539 digested with Xhol / EcoRI in the plasmids described in 3.1. , previously digested with Xhol / EcoRI.
- Example 5 Construction of a control plasmid carrying a sequence coding for a chimeric molecule comprising a DNA binding domain (TetR or Cro) and the transactivating domain of the P53 protein (region 1-73).
- Plasmids p53 1/73 - TetR or Cro with or without tag (myc or VSV) and Hinge were obtained by cloning of fragments amplified by PCR from a plasmid carrying the cDNA of human wild-type p53 using oligos 5661/5662 then digested with Ncol / NotI, Ncol / Xbal, Ncol / BamHI in the plasmids described in 3.1. , previously digested with Ncol / Notl, Ncol / Xbal or Ncol / BamHI.
- Oligo 5661 SEQ ID n ° 19
- the plasmids used for the expression of hybrid molecules were obtained by cloning of the fragments containing the cDNA coding for these molecules at the Ncol / EcoRI sites of the eukaryotic expression vector pcDNA3 (Invitrogen).
- the different constructions thus carried out are as follows:
- TET03 hybrid protein containing the chain p53 (320/393) -Hinge- TetR described in FIG. 5B according to example 4.4
- TET04 hybrid protein containing the chain p53 (320/393) -TetR described in FIG. 5C according to example 4.4
- the different molecules used in this experiment were obtained by in vitro translation into reticulocyte lysate of the molecules described in Example 6 using the TNT Coupled Reticulocyte lysate Systems kit (Promega) according to the experimental protocol described by the supplier for a reaction volume. total of 50 ⁇ l.
- the specific double-stranded DNA sequence used in this experiment consists of two synthetic oligonucleotides, the sequence of which is as follows:
- Oligo 5997 (SEQ ID # 24): GATCCGACTTTCACTTTTCTCTATCACTGATAGTGAGTGGTAAACTCA
- Oligo 5998 (SEQ ID # 25): AGCTTGAGTTTACCACTCCCTATCAGTGATAGAGAAAAGTGAAAGTCG
- the DNA binding reaction is carried out in 50 ⁇ l of reaction medium (Tris-HCI pH 7.4 10 mM, MgCI 2 10 mM, KCI 10 mM, ⁇ -mercaptoethanol 6 mM, EDTA 0.1 mM, BSA 0.5 mg / ml) by adding the TetO sequence (10 10 M) prepared according to Example 7.2, 10 ⁇ l of the translation product prepared according to Example 7.1 and 10 ⁇ M of the cold competing oligonucleotide AP2 (Promega) used to remove the non-specific fixation. The specificity of the interaction is verified by shifting the equilibrium by adding 10 ⁇ M tetracycline (Sigma) to the reaction medium.
- reaction medium Tris-HCI pH 7.4 10 mM, MgCI 2 10 mM, KCI 10 mM, ⁇ -mercaptoethanol 6 mM, EDTA 0.1 mM, BSA 0.5 mg / ml
- TetO sequence 10 10 M
- reaction mixtures are incubated for 15 min at 20 ° C. and then added with 10 ⁇ l of 50% glycerol, and the final mixtures are subjected to native electrophoresis on 5% polyacrylamide gel with migration at 200V and 16 ° C. The gel is then dried and autoradiographed.
- the result of this experiment carried out with the hybrid molecules TET19, TET02 and TET07 is presented in FIG. 9. Under these conditions. The binding of these three molecules to the specific double-stranded DNA sequence TetO is observed by a migration delay of this one, and the specificity of this interaction is demonstrated by the inhibition of this delay by the addition of tetracycline.
- Example 8 Specific binding of the hybrid molecules of the invention to a molecule having a transcriptional transactivating domain.
- the hybrid molecules of the invention ScFv 421, TET19 and TET02 according to Example 6 were produced by in vitro translation using the experimental protocol according to Example 7.1 in the presence of 44 ⁇ Ci of ⁇ S-methionine (Amersham ) (1175 Ci / mmol) to generate these radioactive labeled hybrid molecules.
- the cDNAs of the molecules with or without a transcriptional transactivating domain were cloned into the vector pBlueBaclll (Invitrogen) at the BamHI site. From these vectors, recombinant baculoviruses were produced and purified according to the manufacturer's instructions. The molecules are produced by infection with the recombinant baculovirus of insect cells sf9 according to the manufacturer's experimental protocol. Protein extracts at the final protein concentration of 10 mg / ml are prepared according to the protocol described by K. Ory et al. (K. Ory, EMBO J., 13, 3496-3504, 1994). These molecules are as follows:
- - p53 (1/320): wild p53 protein limited to its amino acid sequence 1 to 320 and therefore devoid of its oligomerization domain and of the domain recognized by the monoclonal antibody pAb421. 8.2. Binding of the hybrid molecules of the invention to molecules with or without a transcriptional transactivating domain
- the hybrid molecule presenting the ScFv 421 (TET19) recognizes well the molecule p53 (1/393) in an equivalent manner to the ScFv 421 alone, and the hybrid molecule presenting the domain 320/393 (TET02) the same properties but with a much greater p53 retention capacity (1/393).
- the absence of signal observed during incubation with the p53 molecule (1/320) shows that these interactions are very specific and mediated by the C-terminal end of the p53 protein (amino acids 320 to 393) as expected.
- the functional recruitment of a transcriptional transactivating domain by the hybrid molecules of the invention was evaluated in an in vivo transactivation system in SAOS-2 cells (human osteosarcoma) deficient for the two alleles of the p53 protein, in the line. H358 tumor deficiency for the two alleles of the p53 protein (Maxwell & Roth, Oncogene 8, 3421, 1993) and in the HT29 tumor line deficient for one of the two alleles of the p53 protein and having a mutated allele (mutation H273).
- This system is based on the use of a reporter gene which can be assayed enzymatically and placed under the dependence of a promoter containing the nucleotide patterns of specific recognition by the Tet repressor. (Operator Tet).
- the reporter gene LUC (luciferase) placed under the control of the operator Tet is contained in the plasmid pUHC13-3 (Gossen M. & Bujard H., Proc. Natl. Acad. Sci. USA, 89, 5547- 5551, 1992).
- the molecules having a transcriptional transactivating domain used in this experiment are the wild-type p53 protein (wt) and the mutants G281 and H 175 of this protein.
- the cDNA coding for these three proteins were inserted at the BamHI site of the vector pcDNA3 (Invitrogen).
- the hybrid molecules of the invention are expressed in cells in culture by transient transfection using the following protocol:
- the cells (3.5 ⁇ 10 5 ) are seeded in 6-well plates containing 2 ml of culture medium, and cultured overnight in a CO 2 (5%) incubator at 37 ° C.
- the different constructions are then transfected using lipofectAMINE (Gibco BRL) as transfection agent in the following manner: 1.5 ⁇ g of total plasmid are incubated (including 0.25 ⁇ g of the reporter plasmid) with 5 ⁇ l of lipofectAMINE for 30 min with 2 ml of culture medium without serum (transfection mixture). Meanwhile, the cells are rinsed twice with PBS and then incubated for 4 h at 37 ° C. with the transfection mixture, after which the latter is aspirated and replaced with 2 ml of culture medium added with 10% fetal calf serum. heat inactivated and cells returned to grow for 48 h at 37 ° C.
- the activation of the transcription linked to the functional recruitment of the transcriptional transactivator is detected and quantified by measuring the luciferase activity encoded by the LUC gene using the Luciferase Assay System kit (Promega) according to the manufacturer's experimental protocol. 9.5. Functional recruitment of a transcriptional transactivator domain by the molecules of the invention
- the TET02 molecule as well as the TET07 positive control were expressed in HT29 cells which have an endogenous mutant p53 protein (H273), the negative control of this experiment consisting in transfecting the empty pcDNA3 vector.
- H273 endogenous mutant p53 protein
- NAME RHONE POULENC RORER S.A.
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Priority Applications (7)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP96911000A EP0817845A1 (fr) | 1995-03-31 | 1996-03-29 | Systeme d'expression conditionnel |
AU54020/96A AU716748B2 (en) | 1995-03-31 | 1996-03-29 | Conditional expression system |
JP8529022A JPH11503011A (ja) | 1995-03-31 | 1996-03-29 | 条件発現系 |
BR9607928A BR9607928A (pt) | 1995-03-31 | 1996-03-29 | Molécula quimérica biespecífica sequência de ácido nucléico sistema condicional de expressão de genes ácido nucléico vetor e composição farmacêutica |
SK1311-97A SK131197A3 (en) | 1995-03-31 | 1996-03-29 | Conditional expression system |
MXPA/A/1997/006928A MXPA97006928A (es) | 1995-03-31 | 1997-09-11 | Sistema de expresion condicional |
NO974449A NO974449L (no) | 1995-03-31 | 1997-09-26 | Kondisjonelt ekspresjonssystem |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
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FR9503841A FR2732348B1 (fr) | 1995-03-31 | 1995-03-31 | Systeme d'expression conditionnel |
FR95/03841 | 1995-03-31 |
Publications (1)
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WO1996030512A1 true WO1996030512A1 (fr) | 1996-10-03 |
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PCT/FR1996/000477 WO1996030512A1 (fr) | 1995-03-31 | 1996-03-29 | Systeme d'expression conditionnel |
Country Status (15)
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EP (1) | EP0817845A1 (fr) |
JP (1) | JPH11503011A (fr) |
KR (1) | KR19980703439A (fr) |
AU (1) | AU716748B2 (fr) |
BR (1) | BR9607928A (fr) |
CA (1) | CA2214451A1 (fr) |
CZ (1) | CZ308097A3 (fr) |
FR (1) | FR2732348B1 (fr) |
HU (1) | HUP9801221A3 (fr) |
IL (1) | IL117713A0 (fr) |
NO (1) | NO974449L (fr) |
SK (1) | SK131197A3 (fr) |
TW (1) | TW496873B (fr) |
WO (1) | WO1996030512A1 (fr) |
ZA (1) | ZA962506B (fr) |
Cited By (13)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2755144A1 (fr) * | 1996-10-29 | 1998-04-30 | Rhone Poulenc Rorer Sa | Fragments d'anticorps a chaine unique anti-p53 et utilisation |
EP0872552A1 (fr) * | 1997-04-15 | 1998-10-21 | Leadd B.V. | Véhicules de transfert de gènes exprimant la protéine VP2 induisant l'apoptose, et/ou l'apoptine |
WO1998046760A1 (fr) * | 1997-04-15 | 1998-10-22 | Leadd B.V. | Vecteur d'apport de gene, exprimant les proteines vp2 induisant l'apoptose, et/ou une apoptine |
WO1998055607A3 (fr) * | 1997-06-04 | 1999-03-04 | Oxford Biomedica Ltd | Vecteur |
WO1999046403A1 (fr) * | 1998-03-11 | 1999-09-16 | Exonhit Therapeutics S.A. | Criblage differentiel qualitatif |
FR2782732A1 (fr) * | 1998-08-28 | 2000-03-03 | Transgene Sa | Systeme d'expression inductible |
EP1040201A1 (fr) * | 1997-11-28 | 2000-10-04 | Invitrogen Corporation | Reactifs de fusion d'anticorps monoclonal a chaine unique regulant une transcription in vivo |
WO2001098515A3 (fr) * | 2000-06-20 | 2002-10-03 | Implyx Ltd | Conjugues regulant l'expression genique |
US6479653B1 (en) * | 1997-08-26 | 2002-11-12 | Ariad Gene Therapeutics, Inc. | Compositions and method for regulation of transcription |
US6881571B1 (en) | 1998-03-11 | 2005-04-19 | Exonhit Therapeutics S.A. | Qualitative differential screening |
US7276488B2 (en) | 1997-06-04 | 2007-10-02 | Oxford Biomedica (Uk) Limited | Vector system |
US7514546B2 (en) | 1999-11-18 | 2009-04-07 | Oxford Biomedica (Uk) Ltd. | Antibodies |
US7691370B2 (en) | 1998-10-15 | 2010-04-06 | Canji, Inc. | Selectivity replicating viral vector |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2003045415A2 (fr) * | 2001-11-26 | 2003-06-05 | University Health Network | Excipients d'administration de peptides auto-assembleurs |
EP1506288B1 (fr) | 2002-05-10 | 2013-04-17 | Medical Research Council | Deaminase induite par activation (aid) |
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- 1996-03-28 ZA ZA962506A patent/ZA962506B/xx unknown
- 1996-03-28 TW TW085103937A patent/TW496873B/zh active
- 1996-03-28 IL IL11771396A patent/IL117713A0/xx unknown
- 1996-03-29 AU AU54020/96A patent/AU716748B2/en not_active Ceased
- 1996-03-29 JP JP8529022A patent/JPH11503011A/ja not_active Ceased
- 1996-03-29 EP EP96911000A patent/EP0817845A1/fr not_active Withdrawn
- 1996-03-29 CZ CZ973080A patent/CZ308097A3/cs unknown
- 1996-03-29 CA CA002214451A patent/CA2214451A1/fr not_active Abandoned
- 1996-03-29 WO PCT/FR1996/000477 patent/WO1996030512A1/fr not_active Application Discontinuation
- 1996-03-29 BR BR9607928A patent/BR9607928A/pt not_active Application Discontinuation
- 1996-03-29 HU HU9801221A patent/HUP9801221A3/hu unknown
- 1996-03-29 KR KR1019970706843A patent/KR19980703439A/ko not_active Ceased
- 1996-03-29 SK SK1311-97A patent/SK131197A3/sk unknown
-
1997
- 1997-09-26 NO NO974449A patent/NO974449L/no not_active Application Discontinuation
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WO1998018825A1 (fr) * | 1996-10-29 | 1998-05-07 | Rhone-Poulenc Rorer S.A. | Fragments d'anticorps a chaine unique anti-p53 et utilisations |
AU745530B2 (en) * | 1996-10-29 | 2002-03-21 | Aventis Pharma S.A. | Anti-p53 single-chain antibody fragments and their uses |
CZ300526B6 (cs) * | 1996-10-29 | 2009-06-10 | Aventis Pharma S.A. | Lécivo obsahující jednoretezcovou protilátku, která se specificky váže na epitop prítomný v C-koncovém úseku p53, nebo nukleovou kyselinu kódující takovou protilátku |
FR2755144A1 (fr) * | 1996-10-29 | 1998-04-30 | Rhone Poulenc Rorer Sa | Fragments d'anticorps a chaine unique anti-p53 et utilisation |
US6852509B1 (en) | 1996-10-29 | 2005-02-08 | Laurent Bracco | Anti-P53 single-chain antibody fragments and their uses |
WO1998046760A1 (fr) * | 1997-04-15 | 1998-10-22 | Leadd B.V. | Vecteur d'apport de gene, exprimant les proteines vp2 induisant l'apoptose, et/ou une apoptine |
EP0872552A1 (fr) * | 1997-04-15 | 1998-10-21 | Leadd B.V. | Véhicules de transfert de gènes exprimant la protéine VP2 induisant l'apoptose, et/ou l'apoptine |
EP0878546A1 (fr) * | 1997-04-15 | 1998-11-18 | Leadd B.V. | Véhicules de transfert de gènes exprimant la protéine VP2 induisant l'apoptose, et/ou l'apoptine |
CZ299963B6 (cs) * | 1997-04-15 | 2009-01-07 | Leadd B. V. | Lécivo obsahující adenovirový genový nosic |
US7531648B2 (en) | 1997-06-04 | 2009-05-12 | Oxford Biomedica (Uk) Limited | Vector encoding an antibody that binds 5T4 antigen |
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US7718627B2 (en) | 1997-06-04 | 2010-05-18 | Oxford Biomedica (Uk) Limited | Vector |
US8084249B2 (en) | 1997-06-04 | 2011-12-27 | Oxford Biomedica (Uk) Limited | Vector |
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US6479653B1 (en) * | 1997-08-26 | 2002-11-12 | Ariad Gene Therapeutics, Inc. | Compositions and method for regulation of transcription |
EP1040201A4 (fr) * | 1997-11-28 | 2001-11-21 | Invitrogen Corp | Reactifs de fusion d'anticorps monoclonal a chaine unique regulant une transcription in vivo |
EP1040201A1 (fr) * | 1997-11-28 | 2000-10-04 | Invitrogen Corporation | Reactifs de fusion d'anticorps monoclonal a chaine unique regulant une transcription in vivo |
US6881571B1 (en) | 1998-03-11 | 2005-04-19 | Exonhit Therapeutics S.A. | Qualitative differential screening |
FR2775984A1 (fr) * | 1998-03-11 | 1999-09-17 | Bioscreen Therapeutics Sa | Criblage differentiel qualitatif |
WO1999046403A1 (fr) * | 1998-03-11 | 1999-09-16 | Exonhit Therapeutics S.A. | Criblage differentiel qualitatif |
US6251590B1 (en) | 1998-03-11 | 2001-06-26 | Exonhit Therapeutics S.A. | Differential Qualitative screening |
US8003375B2 (en) | 1998-03-11 | 2011-08-23 | Exonhit Therapeutics S.A. | Qualitative differential screening |
WO2000012741A3 (fr) * | 1998-08-28 | 2000-05-04 | Transgene Sa | Systeme d'expression inductible |
FR2782732A1 (fr) * | 1998-08-28 | 2000-03-03 | Transgene Sa | Systeme d'expression inductible |
US8133481B2 (en) | 1998-10-15 | 2012-03-13 | Canji, Inc. | Selectively replicating viral vectors |
US7691370B2 (en) | 1998-10-15 | 2010-04-06 | Canji, Inc. | Selectivity replicating viral vector |
US7514546B2 (en) | 1999-11-18 | 2009-04-07 | Oxford Biomedica (Uk) Ltd. | Antibodies |
WO2001098515A3 (fr) * | 2000-06-20 | 2002-10-03 | Implyx Ltd | Conjugues regulant l'expression genique |
Also Published As
Publication number | Publication date |
---|---|
AU5402096A (en) | 1996-10-16 |
FR2732348B1 (fr) | 1997-04-30 |
JPH11503011A (ja) | 1999-03-23 |
HUP9801221A3 (en) | 1999-09-28 |
SK131197A3 (en) | 1998-05-06 |
NO974449D0 (no) | 1997-09-26 |
FR2732348A1 (fr) | 1996-10-04 |
TW496873B (en) | 2002-08-01 |
MX9706928A (es) | 1997-11-29 |
CZ308097A3 (cs) | 1998-01-14 |
CA2214451A1 (fr) | 1996-10-03 |
NO974449L (no) | 1997-09-26 |
IL117713A0 (en) | 1996-07-23 |
AU716748B2 (en) | 2000-03-02 |
KR19980703439A (ko) | 1998-11-05 |
BR9607928A (pt) | 1998-06-09 |
HUP9801221A2 (hu) | 1998-08-28 |
ZA962506B (en) | 1996-10-01 |
EP0817845A1 (fr) | 1998-01-14 |
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