WO1996005312A1 - Nouvel antigene de trypanosoma cruzi, et gene codant pour cette derniere; leur application a la detection de la maladie de chagas - Google Patents
Nouvel antigene de trypanosoma cruzi, et gene codant pour cette derniere; leur application a la detection de la maladie de chagas Download PDFInfo
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- WO1996005312A1 WO1996005312A1 PCT/FR1995/001071 FR9501071W WO9605312A1 WO 1996005312 A1 WO1996005312 A1 WO 1996005312A1 FR 9501071 W FR9501071 W FR 9501071W WO 9605312 A1 WO9605312 A1 WO 9605312A1
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- C—CHEMISTRY; METALLURGY
- C12—BIOCHEMISTRY; BEER; SPIRITS; WINE; VINEGAR; MICROBIOLOGY; ENZYMOLOGY; MUTATION OR GENETIC ENGINEERING
- C12Q—MEASURING OR TESTING PROCESSES INVOLVING ENZYMES, NUCLEIC ACIDS OR MICROORGANISMS; COMPOSITIONS OR TEST PAPERS THEREFOR; PROCESSES OF PREPARING SUCH COMPOSITIONS; CONDITION-RESPONSIVE CONTROL IN MICROBIOLOGICAL OR ENZYMOLOGICAL PROCESSES
- C12Q1/00—Measuring or testing processes involving enzymes, nucleic acids or microorganisms; Compositions therefor; Processes of preparing such compositions
- C12Q1/68—Measuring or testing processes involving enzymes, nucleic acids or microorganisms; Compositions therefor; Processes of preparing such compositions involving nucleic acids
- C12Q1/6876—Nucleic acid products used in the analysis of nucleic acids, e.g. primers or probes
- C12Q1/6888—Nucleic acid products used in the analysis of nucleic acids, e.g. primers or probes for detection or identification of organisms
- C12Q1/6893—Nucleic acid products used in the analysis of nucleic acids, e.g. primers or probes for detection or identification of organisms for protozoa
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- 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
- C07K14/44—Peptides having more than 20 amino acids; Gastrins; Somatostatins; Melanotropins; Derivatives thereof from animals; from humans from protozoa
Definitions
- the subject of the present invention is a new genetic material coding for a new protein recognized by anti-Trypanoso-ma cruzi antisera, and relates to the use of said gene and protein, in particular for diagnostic, pharmaceutical and therapeutic purposes.
- Trypanosoma cruzi is a flagellated protozoan parasite, member of the order of Kinetoplastida and of the family of Trypanosomatidae, responsible for the disease of
- Trypanosoma cruzi occurs in two forms: one mobile thanks to its flagellum or trypomastigote, not dividing; the other aflagellate, or intracellular amastigote, multiplying by binary division.
- insects will complete the parasite's cycle by ingesting the host's trypomastigote forms during the blood meal. These are different in epimastigote forms in the vector intestine and finally infectious metacyclic trypomastigotes in the posterior intestine.
- the acute phase occurs after contamination of the transfusion, congenital or vector type and lasts a few weeks. It is characterized by a large number of parasites circulating in the blood and corresponds to an exponential division of the protozoan.
- the acute phase is most often asymptomatic. However, in infants infected with their mother, the acute phase, which is marked by acute heart disease, can be critical.
- the chronic phase can last for many years. In some individuals this phase is asymptomatic. On the other hand, other patients have tissue damage in the heart or manifestations of the digestive type. In any case, the clinical diagnosis must always be confirmed by tests to demonstrate either antibodies directed against parasitic antigens, or the parasite itself.
- This disease is becoming a global problem due to contamination by blood transfusion. It therefore became essential to have diagnostic tests which make it possible to determine the presence of the parasite in individuals.
- Different serological tests are available, such as direct agglutination, indirect immunofluorescence (IFI), complement fixation tests (RFC), ELISA tests (Enzyme Linked Immunosorbent Assay).
- IFI indirect immunofluorescence
- ROC complement fixation tests
- ELISA tests Enzyme Linked Immunosorbent Assay.
- the Trypanosoma cruzi antigens used for serological tests originate from a total lysate of the noninfecting stage of the parasite or from partially purified protein fractions. However, these fractions do not allow the obtaining of antigens in sufficient quantity and quality for the development of a reliable serological diagnostic test.
- the phage lrtrt allows the insertion of foreign DNA with a maximum size of 7Kb into the EcoRI site located in the lac Z gene, under the control of the lac promoter.
- the product obtained is a recombinant protein in fusion with betagalactosidase, inducible by IPTG (isopropyl thio beta D galactoside).
- H49 antigen (Paranhos et al., 1994 (1)).
- this antigen does not allow a sensitivity of serological detection of 100% of patients in the acute or chronic phase. It has therefore been envisaged to combine the H49 antigen with the CRA antigen (Cytoplasmic Repetitive Antigen) (Lafaille et al., (1989) (2)) without thereby solving this problem.
- CRA antigen Cytoplasmic Repetitive Antigen
- the present inventors have identified and obtained for the first time a new genetic material coding for a new protein, recognized by anti-sera anti-Trypanosoma cruzi, which overcomes the above disadvantages.
- the genetic material can be used to produce proteins or polypeptides for the production of diagnostic tests, or for the preparation of vaccine or pharmaceutical compositions, or be used either itself as a probe, or for the determination of specific probes usable in nucleic acid hybridization assays for the detection of Trypanosoma cruzi infections.
- the protein or any corresponding polypeptide can be used for the production of antibodies specific to the parasite, for diagnostic or passive protection purposes.
- the subject of the present invention is a DNA or RNA molecule, constituted by at least one strand comprising a nucleotide sequence represented in the identifier SEQ ID N01, or a complementary, or antisense, or equivalent sequence. to said sequence identified in the identifier SEQ ID N01, and in particular a sequence having, for any series of 100 contiguous monomers, at least 50%, preferably at least 60%, or better still, at least 85% with homology said sequence.
- nucleotide sequence is meant either a strand of DNA or its complementary strand, or a strand of RNA or its antisense strand or their corresponding complementary DNA.
- the DNA sequence as represented in the identifier SEQ ID N01 corresponds to the sequence of the messenger RNA ⁇ it being understood that the thymine (T) in the DNA is replaced by the uracil (U) in the RNA .
- two nucleotide sequences are said to be equivalent to each other, or to a reference sequence, if functionally the corresponding biopolymers can play substantially the same role, without being identical, with respect to for the application or use under consideration, or in the technique in which they operate; are in particular equivalent two sequences obtained due to natural variability, in particular spontaneous mutation of the species from which they have been identified, or induced, as well as homologous sequences, the homology being defined below.
- variability any modification, spontaneous or induced of a sequence, in particular by substitution, and / or insertion, and / or deletion of nucleotides and / or nucleotide fragments, and / or extension and / or shortening of the sequence to at least one of the ends; unnatural variability may result from the genetic engineering techniques used; this variability can result in modifications of any starting sequence, considered as reference, and which can be expressed by a degree of homology with respect to said reference sequence.
- Homology characterizes the degree of identity of two nucleotide (or peptide) fragments compared; it is measured by the percentage of identity which is notably determined by direct comparison of nucleoditic (or peptide) sequences, compared with reference nucleotide (or peptide) sequences.
- nucleotide fragment is said to be equivalent to a reference fragment, if it has a nucleotide sequence equivalent to the reference sequence; according to the preceding definition, are in particular equivalent to a reference nucleotide fragment: a) any fragment capable of hybridizing at least partially with the complement of the reference fragment, b) any fragment whose alignment with the reference fragment leads to highlight identical contiguous bases, in greater number than with any other fragment from another taxonomic group.
- the invention also relates to DNA or RNA fragments whose nucleotide sequence is identical, complementary, antisense, or equivalent to any of the following sequences: - that starting at nucleotide 1232 and ending at nucleotide 2207 of SEQ ID N01
- the subject of the invention is also a protein, called PTclOO by the Applicant, having an apparent molecular mass of approximately 100 kDa, recognized by anti-sera anti-Trypa-nosoroa cruzi, or an immunological equivalent of this protein; and their fragments.
- the amino acid sequence of this protein is represented in the sequence identifier SEQ ID N02.
- immunological equivalent any polypeptide or peptide capable of being immunologically recognized by the antibodies directed against said protein PTclOO.
- the invention also relates to any fragment of the PTclOO protein.
- a particular protein fragment has a sequence starting at amino acid 323 and ending at amino acid 520 of the sequence defined in the identifier SEQ ID N02, said fragment being specifically recognized by antisera ant i-Trypanosoma cruzi; the invention also relates to any immunological equivalent of said fragment.
- the PTclOO protein and said protein fragments may include modifications, in particular chemical modifications, which do not alter their immunogenicity.
- the present invention also relates to a functional expression cassette, in particular in a cell derived from a prokaryotic or eukaryotic organism, allowing the expression of DNA coding for the whole or a fragment of the protein PTclOO, in particular of a DNA fragment as defined above, placed under the control of the elements necessary for its expression; said protein and said protein fragments being recognized by anti-Trypanosoma cruzi antisera.
- any cell originating from a prokaryotic or eukaryotic organism can be used in the context of the present invention.
- Such cells are known to those skilled in the art.
- a eukaryotic organism such as cells from a mammal, in particular CHO cells (Chinese Hamster Ovarian); insect cells; cells originating from a fungus, in particular single-celled or from a yeast, in particular from the strain Pichia, Saccharomyces, Schizosaccharomyces and very particularly selected from the group consisting of Saccharomyces cerevisiae, Schizosaccharomyces pombe, Schizosaccharomyces malidevorans, Schizosaccharomyces sloofiae, Schizosaccharomyces octosporus.
- E coli Escherichia coli
- enterobacteria cells of enterobacteria.
- ATCC Rockville, MA, USA
- AFRC Agriculture & Food Research Council, Norfolk, UK.
- the cell can be wild type or mutant. The mutations are described in the literature accessible to those skilled in the art.
- E cell For the purposes of the present invention, an E cell is used.
- coli DH5a (sold by CLONTECH under the reference: C2007-1).
- the expression cassette of the invention is intended for the production of the PTclOO protein or for fragments of said protein produced by the above-mentioned E. coli cell, and recognized by human antisera.
- antisera come from patients who have acquired a recent or old infection with Trypanosoma cruzi, and contain immunoglobulins specifically recognizing PTclOO.
- the PTclOO protein can also be recognized by other antibodies, such as, for example, monoclonal or polyclonal antibodies obtained by immunization of various species with the aforementioned natural protein, the recombinant protein, their fragments or peptides.
- protein PTclOO means the cytoplasmic antigen of natural Trypanosoma cruzi, or produced in particular by the techniques of genetic recombination described in the present application, or any fragment or mutant of this antigen provided that it is immunologically reactive with antibodies directed against the protein PTclOO of this parasite.
- such a protein has an amino acid sequence having a degree of homology of at least 70%, preferably at least 85% and, most preferably, at least 95% by relative to the sequence identified in the identifier SEQ ID N02.
- an equivalent can be obtained by deletion, substitution and / or addition of one or more amino acids of the native or recombinant protein. It is within the reach of ordinary skill in the art to effect these modifications by known techniques without affecting immunological recognition.
- the PTclOO protein can be modified in vitro, in particular by deletion or addition of chemical groups, such as phosphates, sugars or myristic acids, so as to improve its stability or the presentation of one or more several epitopes.
- the expression cassette according to the invention allows the production of a PTclOO protein (having an amino acid sequence as specified above) and of fragments of said protein, fused to an exogenous element which can help with its stability, its purification, its production or its recognition.
- an exogenous element is within the reach of those skilled in the art. It can in particular be a hapten, an exogenous peptide or a protein.
- the expression cassette according to the invention comprises the elements necessary for the expression of said DNA fragment in the cell considered.
- elements necessary for expression is meant all of the elements which allow the transcription of the DNA fragment into messenger RNA (mRNA) and the translation of the latter into protein.
- mRNA messenger RNA
- the present invention also extends to a vector comprising an expression cassette according to the invention. It may be a viral vector and in particular a vector derived from a baculovirus, more particularly intended for expression in insect cells, or a vector derived from an adenovirus for expression in mammalian cells.
- It can also be a plasmid vector with autonomous replication and in particular a multiplier vector.
- the present invention also relates to a cell derived from a prokaryotic or eukaryotic organism, comprising an expression cassette, either in a form integrated into the cell genome, or inserted into a vector.
- a cell has been defined previously.
- the present invention also relates to a process for the preparation of a PTclOO protein, or of fragments of said protein, according to which:
- a cell from a prokaryotic or eukaryotic organism, comprising the expression cassette according to the invention, is cultured under appropriate conditions;
- the present invention also relates to one or more peptides, the amino acid sequence of which corresponds to part of the sequence of the PTclOO protein, and which, alone or in admixture, reacts with all of the sera from individuals or animals infected with Trypanosoma cruzi.
- the peptides can be obtained by chemical synthesis, lysis of the protein PTclOO, or by genetic recombination techniques.
- the invention also relates to monoclonal or polyclonal antibodies obtained by immunological reaction of a human or animal organism with a munogenic agent i constituted by the natural protein PTclOO, recombinant and their fragments, or by a peptide, as defined above.
- a munogenic agent i constituted by the natural protein PTclOO, recombinant and their fragments, or by a peptide, as defined above.
- the present invention also relates to a reagent for the detection and / or monitoring of a Trypanosoma cruzi infection, which comprises, as reactive substance, a PTclOO protein as defined above, or its fragments, a peptide or a mixture of peptides such as defined above, or at least one monoclonal or polyclonal antibody as described above.
- the above reagent can be attached directly or indirectly to an appropriate solid support.
- the solid support may in particular be in the form of a cone, a tube, a well, a ball, or the like.
- the term "solid support” as used herein includes all materials on which a reagent can be immobilized for use in diagnostic testing.
- Natural, synthetic materials, chemically modified or not, can be used as solid supports, in particular polysaccharides such as cellulose-based materials, for example paper, cellulose derivatives such as cellulose acetate and nitrocellulose; polymers such as vinyl chloride, polyethylene, polystyrenes, polyacrylate or copolymers such as polymers of vinyl chloride and propylene, polymers of vinyl chloride and vinyl acetate; copolymers based on styrene, natural fibers such as cotton and synthetic fibers such as nylon.
- the solid support is a polystyrene polymer or a butadiene-styrene copolymer.
- the support is a polystyrene or a styrene-based copolymer comprising between approximately 10 and 90% by weight of styrene units.
- the fixing of the reagent on the solid support can be carried out directly or indirectly. Directly, two approaches are possible: either by adsorption of the reagent on the solid support, that is to say by non-covalent bonds (mainly of hydrogen, Van der Walls or ionic type), or by establishment of covalent bonds between the reactive and support.
- an “anti-reagent” compound capable of interacting with the reagent can be fixed beforehand (by adsorption or covalence) capable of interacting with the reagent so as to immobilize the assembly on the solid support.
- an anti-PTclOO antibody on the condition that it is immunologically reactive with a part of the protein different from that involved in the reaction for recognition of sera antibodies; a ligand-receptor system, for example by grafting on the protein PTclOO a molecule such as a vitamin, and immobilizing on the solid phase the corresponding receptor (for example the biotin-streptavidin system).
- indirect way is also meant the prior grafting or fusion by genetic recombination of a protein, or a fragment of this protein, or of a polypeptide, at one end of the PTclOO protein, and the immobilization of the latter on the solid support by passive adsorption or covalence of the grafted or fused protein or polypeptide.
- the invention also relates to a method for the detection and / or monitoring of a Trypanosoma cruzi infection in a biological sample, such as a blood sample from an individual or an animal likely to have been infected with Trypanosoma cruzi, characterized in that said sample is brought into contact with a reagent as defined above, under conditions allowing a possible immunological reaction, and the presence of an immune complex is then detected with said reagent.
- a biological sample such as a blood sample from an individual or an animal likely to have been infected with Trypanosoma cruzi
- sandwich-type detection method in one or more stages, as described in particular in patents FR 2 481 318 and FR 2 487 983, which consists in reacting a first monoclonal antibody or polyclonal specific for a desired antigen, fixed on a solid support, with the sample, and to demonstrate the possible presence of an immune complex thus formed by a second antibody labeled with any suitable marker known to man of the profession, in particular a radioactive isotope, an enzyme for example peroxidase or alkaline phosphatase or the like; by so-called competition techniques well known to those skilled in the art.
- the subject of the invention is also an active immunotherapeutic composition, in particular a vaccine preparation, which comprises, as active principle, a natural, recombinant PTclOO protein or their fragments, or the peptides identified above, the active principle being optionally conjugated with a pharmaceutically acceptable carrier, and optionally an excipient and / or a suitable adjuvant.
- a vaccine preparation which comprises, as active principle, a natural, recombinant PTclOO protein or their fragments, or the peptides identified above, the active principle being optionally conjugated with a pharmaceutically acceptable carrier, and optionally an excipient and / or a suitable adjuvant.
- the present invention also covers a pharmaceutical composition for the treatment or prevention of a Trypanosoma cruzi infection in a human or animal, comprising a therapeutically effective amount of an expression cassette, a vector, a cell derived from a prokaryotic or eukaryotic organism as defined above, from a PTclOO protein according to the invention, or from its fragments, or from an antibody of the invention.
- the present invention also relates to probes and primers specific for T. cruzi, and their uses in diagnostic tests.
- probe refers to DNA or RNA comprising at least one strand having a nucleotide sequence allowing hybridization to nucleic acids having a nucleotide sequence as represented in the identifier SEQ ID N01, or a sequence complementary, or antisense, or equivalent to said sequence, and in particular a sequence having, for any continuation from 5 to 100 contiguous monomers, at least 50%, preferably at least 60%, or better still, at least 85% homology to SEQ ID N01, to its fragments, or to a synthetic oligonucleotide allowing such hybridization, unmodified or comprising one or more modified bases such as inosine, methyl-5-deoxycytidine, deoxyuridine, dimethylamino-5-deoxyuridine, diamino-2,6-purine, bromo-5-deoxyuridine or any other modified base.
- modified bases such as inosine, methyl-5-deoxycytidine, deoxyuridine, dimethylamino-5-deoxyuridine
- these probes can be modified at the sugar level, namely the replacement of at least one deoxyribose by a polyamide (PE NIELSEN et al. (1991) (13)), or at the phosphate group, for example its replacement with esters, in particular chosen from esters of diphosphate, of alkyl and arylphosphonate and of phosphorothioate.
- a polyamide PE NIELSEN et al. (1991) (13)
- esters in particular chosen from esters of diphosphate, of alkyl and arylphosphonate and of phosphorothioate.
- probes can be much shorter than the sequence identified in the identifier SEQ ID N01.
- probes comprise at least 5 monomers, advantageously from 8 to 50 monomers, having a specificity for hybridization under determined conditions to form a hybridization complex with DNA or RNA having a nucleotide sequence such as previously defined.
- a probe according to the invention can be used for diagnostic purposes, as a capture and / or detection probe, or for therapy purposes.
- the capture probe can be immobilized on a solid support by any suitable means, that is to say directly or indirectly, for example by covalence or passive adsorption.
- the detection probe is marked by means of a marker chosen from radioactive isotopes, enzymes notably chosen from peroxidase and alkaline phosphatase, and those capable of hydrolyzing a chromogenic, fluorigenic or luminescent substrate, chromophoric chemical compounds, chromogenic, fluorigenic or luminescent compounds, nucleotide-based analogs, and biotin.
- the probes of the present invention used for diagnostic purposes can be used in all known hybridization techniques, and in particular the so-called "Dot-Blot” techniques (Maniatis et al. (1982) (14)), Southern Blot (Southern EM (1975) (15)), Northern Blot, which is a technique identical to the Southern Blot technique but which uses RNA as target, the sandwich technique (Dunn AR et al. (1977) (16) ).
- the sandwich technique is used comprising a specific capture probe and / or a specific detection probe, it being understood that the capture probe and the detection probe must have an at least partially different nucleotide sequence.
- Another application of the invention is a therapy probe for treating infections due to Trypanosoma cruzi, said probe being capable of hybridizing in vivo on the DNA or RNA of the parasite to block the phenomena of translation and / or transcription and / or replication.
- a primer is a probe comprising from 5 to 30 monomers, having a specificity of hybridization under predetermined conditions, for the initiation of an enzymatic polymerization, for example in an amplification technique such as PCR (Polymerase Chain Reaction) , in an elongation process such as sequencing, in a reverse transcription method or the like.
- a preferred probe or primer will comprise a nucleotide sequence chosen from the sequences SEQ ID N07, SEQ ID N08, SEQ ID N09, SEQ ID N010, SEQ ID N012.
- the invention also relates to a reagent for detecting and / or identifying Trypanosoma cruzi in a biological sample, comprising at least one probe as defined above, in particular a capture probe and a detection probe, one and / or the another that meets the definition above.
- the invention therefore provides a method for selectively detecting and / or identifying Trypanosoma cruzi in a biological sample, according to which the RNA, extract of the parasite and possibly denatured, or the DNA, denatured extract, or the DNA obtained is exposed. from the reverse transcription of the RNA, to at least one probe as defined above and the hybridization of said probe is detected.
- FIG. 1 represents the restriction map of the TclOO gene, deduced by Southern blot from different fragments obtained after digestion of Trypanosoma cruzi DNA with restriction endonucleases.
- Figure 2 is a schematic representation of the three overlapping regions of the TclOO cDNA.
- the numbered arrows represent the oligonucleotides used as primers for PCR amplification.
- An expression library was constructed from fragments of genomic DNA from Trypanosoma cruzi.
- the DNA of T. cruzi, strain G (YOSHIDA. N, (1983) (17)), isolated from metacyclic trypomastigote stage was digested with the enzyme DNase I. After selection of the fragments according to their size, these were ligated to synthetic coRI adapters and cloned into the EcoRI site of the DNA of the vector lambda gtll (Young and Davis , 1983 (3); Cotrim et al., 1990) (4).
- Tc50 The clone, named Tc50 by the Applicant, was isolated from the bank by immunological screening, using a mixture of sera from patients with Chagas disease in chronic phase.
- the phage clone Tc50 was purified, amplified and the insert was highlighted by the PCR ("Polymerase Chain Reaction") technique, using the primers:
- the DNA of the Tc50 clone was sequenced in this same vector, using specific primers located 3 'and 5' from the pGEX cloning site, according to the chain termination technique (Sanger et al ., 1977 (5)) and following the supplier's protocol (USB-Amersham).
- the nucleotide sequence of the 594 bp Tc50 fragment, as well as its deduced amino acid sequence (198 aa) are represented in the identifiers SEQ ID NOI and SEQ ID N02, respectively.
- the nucleotide sequence of the 594 bp Tc50 fragment begins at nucleotide (nt) 1232 and ends at nucleotide 1825.
- the corresponding amino acid sequence begins at amino acid 323 and ends at amino acid 520 of SEQ ID NO2
- pGEX-Tc50 synthesizes, in the bacterium DH5alpha, a protein in fusion with GST ("Glutathione S Transferase"), of apparent molecular mass of 50 kDa, demonstrated by electrophoresis on polyacrylamide gel SDS- PAGE (SDS: Dodecyl Sodium Sulfate) (Laem li, 1970 (6)).
- the reactivity of the protein towards chagas humans has been confirmed by the Western blot technique (Towbin et al., 1979 (7)), using the same mixture of chronic phase chagas used for screening. from the bank in lambda gtll.
- GST-Tc50 obtained after lysis of the bacterial extracts by ultrasound was purified by affinity chromatography on a column of agarose glutathione (Sigma), according to the method of Smith and Johnson, (1988) (8).
- the antigenic properties of the GST-Tc50 recombinant antigen were tested by ELISA (Voiler et al, 1975 (9)).
- microtiter plates Maxisorp (trade name), Nunc) were sensitized with 100 ng / ml of the GST-Tc50 antigen in 100 mM NaHC03 (pH 9.6). After incubation with the sera of patients, the immune complexes were detected using an anti-human IgG goat serum, coupled with peroxidase.
- Example 3 Identification of the native protein of T. cruzi. presenting the anti ⁇ èni ⁇ ues determinants of the Tc50 clone
- the nuclear DNA of T. cruzi, strain G was digested with different restriction endonucleases (BamHI, EcoRI, HindIII, Pstl, PvuII, Sacl, BamHI / EcoRI, BamHI / PvuII, EcoRI / HindIII, EcoRI / Pstl, EcoRI / PvuII, EcoRI / Sacl, Pstl / Sacl, Pstl / PvuII, PvuII / Sac,
- the primer SEQ ID N05 is located in the previously sequenced part of the 594 bp fragment of Tc50.
- the primer SEQ ID N06 corresponds to the primer of the phage lambda gt10.
- This 1041 bp fragment which begins at nucleotide 1403 and ends at nucleotide 2443 of SEQ ID N01, has an open reading frame, in phase with the sequence of the 594 bp fragment of Tc50.
- the cDNA was synthesized from total RNA of T epimastigotes. cruzi, strain G.
- the TclOO cDNA was amplified by the PCR technique, in three different fragments: a fragment A corresponding to the 5 'region of 1459 bp, a fragment B corresponding to the central region of 942 bp, a fragment C corresponding to the 3 ′ region of 1406 bp of the TclOO cDNA, as shown diagrammatically in FIG. 2.
- SEQ ID N07 corresponds to a part of the consensus sequence of 35 nucleotides present in 5 ′ of mRNAs in trypanosomatids and called "Spliced leader" (Parsons et al. 1984 (11)).
- SEQ ID NO 08 corresponds to the complementary sequence of part of the predetermined sequence of the 594 bp fragment, and begins at nucleotide 1442 and ends at nucleotide 1459 of SEQ ID N01, according to the numbering of the coding strand.
- the total cDNA of T. cruzi was amplified by PCR using the primers:
- sequence ID NO9 which corresponds to a part of the predetermined 594 bp sequence of the TclOO gene, begins at nucleotide 1266 and ends at nucleotide 1287 of SEQ ID NO1.
- sequence SEQ ID N010 corresponds to the complementary sequence of a part of the previously described sequence of 1041 bp of the TclOO gene. This sequence SEQ ID NO10 begins at nucleotide 2187 and ends at nucleotide 2207 of SEQ ID NO1, according to the numbering of the coding strand.
- the fragment obtained 942 bp in length, was cloned into the plasmid pCRII and sequenced.
- the sequence shown in the identifier SEQ ID N01 begins at nucleotide 1266 and ends at nucleotide 2207.
- the total cDNA of T. cruzi was synthesized using the hybrid primer oligo dT) - ⁇ adapter:
- the 3 'region of the TclOO cDNA was amplified using the adapter primer and the following pair of primers:
- sequence SEQ ID N012 corresponds to a part of the previously described sequence 1041 bp of the TclOO gene, starting at nucleotide 1997 and ending at nucleotide 2017.
- sequence SEQ ID N011 corresponds to the arbitrary sequence of the adapter represented in SEQ ID N011.
- TclOO cDNA 3402 bp in size, was completely sequenced. It has an open reading frame of 2745 bp, and the deduced amino acid sequence is 915. The methionine codon is in position 266 and the stop codon in position 3011.
- the TclOO gene of Trypanosoma cruzi codes for the new protein PTclOO, with a theoretical molecular mass of 100 kDa.
- AAAGCCCATT CATGCGGTGA AGTTTGTGAA TTACCGCAGT AACGTCGCAG CATCGGCTGG
- REPLACEMENT FEWUE REOE 261 TGCGAAGCGG AAGGCAACAA TGCCAGATTC TTCTCTTCAC GCCACGAGCT CCTTTCAAGG
- GCTACACGGC GGAATCGACC ATTTTATTAT TATTATTATT GTCTTTAGTA TTATGTTTTT
- 3370 3380 3390 3400 TTATCCTTAA AAGGAAGAGA GACCAAAAAAAAAA AA
- RECTIFIED SHEET (RULE 91) 1 INFORMATION FOR SEQ ID NO: 3 li CHARACTERISTICS OF THE SEQUENCE: liA LENGTH: 24 bases liB TYPE: nucleic acid liC NUMBER OF STRANDS: simple liD CONFIGURATION: linear lii TYPE OF MOLECULE: DNA (phage)
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Priority Applications (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| BRPI9506314A BRPI9506314B8 (pt) | 1994-08-12 | 1995-08-09 | reagente para detecção e/ou monitoramento de uma infecção por trypanosoma cruzi. |
| EP95927775A EP0723589A1 (fr) | 1994-08-12 | 1995-08-09 | Nouvel antigene de trypanosoma cruzi, et gene codant pour cette derniere; leur application a la detection de la maladie de chagas |
| CA002173957A CA2173957C (fr) | 1994-08-12 | 1995-08-09 | Nouvel antigene de trypanosoma cruzi, et gene codant pour cette derniere; leur application a la detection de la maladie de chagas |
| AU31691/95A AU3169195A (en) | 1994-08-12 | 1995-08-09 | Novel trypanosoma cruzi antigen, and gene coding therefor; their application to the detection of chagas' disease |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FR9410132A FR2723589B1 (fr) | 1994-08-12 | 1994-08-12 | Nouvel antigene de trypanosoma cruzi, et gene codant pour cette derniere; leur application a la detection de la maladie de chagas |
| FR94/10132 | 1994-08-12 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| WO1996005312A1 true WO1996005312A1 (fr) | 1996-02-22 |
Family
ID=9466385
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| PCT/FR1995/001071 Ceased WO1996005312A1 (fr) | 1994-08-12 | 1995-08-09 | Nouvel antigene de trypanosoma cruzi, et gene codant pour cette derniere; leur application a la detection de la maladie de chagas |
Country Status (7)
| Country | Link |
|---|---|
| US (3) | US5820864A (fr) |
| EP (1) | EP0723589A1 (fr) |
| AU (1) | AU3169195A (fr) |
| BR (1) | BRPI9506314B8 (fr) |
| CA (1) | CA2173957C (fr) |
| FR (1) | FR2723589B1 (fr) |
| WO (1) | WO1996005312A1 (fr) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1999029867A1 (fr) * | 1997-12-10 | 1999-06-17 | Bio Merieux | Antigene de trypanosoma cruzi, gene codant pour celui-ci, et methodes de detection et de traitement de la maladie de chagas |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7749717B2 (en) * | 2006-10-19 | 2010-07-06 | Abbott Laboratories | Methods for the detection and diagnosis of Trypanosoma cruzi infection |
| WO2010129267A2 (fr) * | 2009-04-27 | 2010-11-11 | University Of Georgia Research Foundation, Inc. | Peptides anti-trypanosome et leurs utilisations |
| US20120316211A1 (en) * | 2011-05-11 | 2012-12-13 | The Board or Regents of the University of Texas System | Diagnostic Methods for Assessing Risk of Chagas Disease and Heart Failure |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2452288A1 (fr) * | 1979-03-29 | 1980-10-24 | Wellcome Found | Antigene glycoproteique, sa preparation et vaccin contenant cet antigene |
| WO1991017759A1 (fr) * | 1990-05-11 | 1991-11-28 | Research Corporation Technologies, Inc. | Facteur immunosuppresseur trypanosomique |
| WO1994001776A1 (fr) * | 1992-07-10 | 1994-01-20 | Abbott Laboratories | Methode de titrage pour detecter la maladie de chagas et reactifs utilises a cet effet |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5256545A (en) * | 1987-03-30 | 1993-10-26 | Board Of Regents, The University Of Texas System | Sterol Regulatory Elements |
| US5495070A (en) * | 1988-10-04 | 1996-02-27 | Agracetus, Inc. | Genetically engineering cotton plants for altered fiber |
| GB8904762D0 (en) * | 1989-03-02 | 1989-04-12 | Glaxo Group Ltd | Biological process |
| US5474925A (en) * | 1991-12-19 | 1995-12-12 | Agracetus, Inc. | Immobilized proteins in cotton fiber |
| US5312746A (en) * | 1993-01-08 | 1994-05-17 | Life Technologies, Inc. | Cloning and expressing restriction endonucleases and modification methylases from caryophanon |
-
1994
- 1994-08-12 FR FR9410132A patent/FR2723589B1/fr not_active Expired - Fee Related
-
1995
- 1995-06-07 US US08/480,917 patent/US5820864A/en not_active Expired - Lifetime
- 1995-08-09 BR BRPI9506314A patent/BRPI9506314B8/pt not_active IP Right Cessation
- 1995-08-09 WO PCT/FR1995/001071 patent/WO1996005312A1/fr not_active Ceased
- 1995-08-09 CA CA002173957A patent/CA2173957C/fr not_active Expired - Fee Related
- 1995-08-09 EP EP95927775A patent/EP0723589A1/fr not_active Withdrawn
- 1995-08-09 AU AU31691/95A patent/AU3169195A/en not_active Abandoned
-
1998
- 1998-08-24 US US09/138,735 patent/US6933110B1/en not_active Expired - Fee Related
- 1998-08-24 US US09/138,736 patent/US6270767B1/en not_active Expired - Fee Related
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2452288A1 (fr) * | 1979-03-29 | 1980-10-24 | Wellcome Found | Antigene glycoproteique, sa preparation et vaccin contenant cet antigene |
| WO1991017759A1 (fr) * | 1990-05-11 | 1991-11-28 | Research Corporation Technologies, Inc. | Facteur immunosuppresseur trypanosomique |
| WO1994001776A1 (fr) * | 1992-07-10 | 1994-01-20 | Abbott Laboratories | Methode de titrage pour detecter la maladie de chagas et reactifs utilises a cet effet |
Non-Patent Citations (6)
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6403103B1 (en) | 1994-08-12 | 2002-06-11 | Bio Merieux | Trypanosoma cruzi antigen, gene encoding therefore, and methods of detecting and treating chagas disease |
| WO1999029867A1 (fr) * | 1997-12-10 | 1999-06-17 | Bio Merieux | Antigene de trypanosoma cruzi, gene codant pour celui-ci, et methodes de detection et de traitement de la maladie de chagas |
Also Published As
| Publication number | Publication date |
|---|---|
| BR9506314A (pt) | 1997-08-05 |
| FR2723589B1 (fr) | 1996-09-20 |
| BR9506314B1 (pt) | 2010-08-10 |
| CA2173957C (fr) | 2003-03-25 |
| BRPI9506314B8 (pt) | 2016-06-07 |
| US6270767B1 (en) | 2001-08-07 |
| AU3169195A (en) | 1996-03-07 |
| MX9601346A (es) | 1998-06-30 |
| US6933110B1 (en) | 2005-08-23 |
| US5820864A (en) | 1998-10-13 |
| CA2173957A1 (fr) | 1996-02-22 |
| EP0723589A1 (fr) | 1996-07-31 |
| FR2723589A1 (fr) | 1996-02-16 |
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