WO1997049833A1 - Procede de formation de complexes d'hybridation dont la stabilite depend peu de la composition en base des deux molecules d'acides nucleiques hybridees - Google Patents
Procede de formation de complexes d'hybridation dont la stabilite depend peu de la composition en base des deux molecules d'acides nucleiques hybridees Download PDFInfo
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- WO1997049833A1 WO1997049833A1 PCT/FR1997/001131 FR9701131W WO9749833A1 WO 1997049833 A1 WO1997049833 A1 WO 1997049833A1 FR 9701131 W FR9701131 W FR 9701131W WO 9749833 A1 WO9749833 A1 WO 9749833A1
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Classifications
-
- 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
- C12Q1/6813—Hybridisation assays
- C12Q1/6827—Hybridisation assays for detection of mutation or polymorphism
-
- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07H—SUGARS; DERIVATIVES THEREOF; NUCLEOSIDES; NUCLEOTIDES; NUCLEIC ACIDS
- C07H21/00—Compounds containing two or more mononucleotide units having separate phosphate or polyphosphate groups linked by saccharide radicals of nucleoside groups, e.g. nucleic acids
-
- 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
- C12Q1/6813—Hybridisation assays
- C12Q1/6832—Enhancement of hybridisation reaction
Definitions
- the present invention relates to a process for the formation of hybridization complexes whose stability depends little on the base composition of the two hybrid nucleic acid molecules.
- the invention also relates to the implementation of this method for the analysis of nucleic acid sequences.
- the subject of the invention is also hybridization complexes formed from two complementary, or substantially complementary, nucleic acid molecules, the stability of which depends little on the base composition of said two hybridized nucleic acid molecules.
- the A-T (or A-U) and G-C pairing law gives nucleic acids the property of forming specific hybridization complexes between complementary sequences. This property, which has been known for a long time, makes it possible to use a nucleic acid fragment, or oligonucleotide, as a probe, to demonstrate the presence of a complementary nucleic sequence.
- the analysis of DNA fragments after separation on gel (E. Southern, J. Mol. Biol., 1975, 98, 503-517) is today widely used both in the field of fundamental research and in that of medical analysis (Caskey, Science, 1987, 236, 1223-1228; Landegrer et al., Science, 1988, 242, 229-237; Arnheim et al., Ann Rev. Biochem., 1992, 61, 131- 156).
- nucleic acid analysis techniques based on their hybridization property with probes have been developed, in particular for the sequencing of unknown DNA or RNA, the detection of pathology-related sequences, the search for point mutations in sequences (S. Ikata et al., Nuclei. Acids Res., 1987, 15, 797-811; JA Matthews, LJ Kricka, Analytical Biochemi ⁇ tr ⁇ , 1988, 169, 1 -25).
- These new methods consist in detecting the signals emitted by the hybrids formed from the pairing of a labeled DNA with a series of oligonucleotides of the same length and of different sequences immobilized on a membrane or a glass surface, then in reconstructing the sequence. of the DNA fragment according to an algorithmic process.
- the analysis of the hybridization complexes obtained by the above methods is based on the greater stability of the hybrids without mismatch compared to that of the hybrids comprising one or more mismatches.
- the discrimination between a perfect hybrid and a hybrid with mismatch can be achieved for example by raising the temperature of the medium, which causes dissociation of the complexes with mismatch before that of the complexes without mismatch.
- oligonucleotides composed of the natural nucleosides dA, dG, dC, T or dU, therefore constitutes a major obstacle to the development of these new techniques for analyzing nucleic acid sequences.
- the present invention therefore aims to provide a method for forming hybridization complexes whose stability depends little on the base composition of the two hybrid nucleic acid molecules.
- This object is achieved by a method consisting in bringing a first nucleic acid molecule into contact with a second nucleic acid molecule under conditions allowing the formation of a specific hybridization complex, characterized in that one at least of the four types of base entering the sequence of the first and / or second nucleic acid molecule is a modified base having pairing properties close to those of the natural base which it replaces, so that one at less of the two types of base pair entering into the composition of the complex comprises a modified base and in that the set of base pairs entering into the composition of said complex exhibits similar stability.
- the deoxycytidine will be represented indifferently by C or dC, marked with "*" to designate the corresponding modified base
- deoxyguanosine will be represented either by G or dG
- deoxyuridine will be represented respectively by T or du
- deoxyadenosine will be represented either by A or dA, marked with an "*" to designate the corresponding modified base.
- the invention proposes to replace at least one of the natural nucleosides chosen from deoxycytidine (dC), deoxyguanosine (dG), thymidine (T ) and deoxyadenosine (dA), by nucleosides modified but respecting the law of pairing, designated respectively dC *, dG *, du * and dA *, in order to have nucleic acid sequences capable of forming complexes of hybridization in which: the base pairs C * -G and / or G * -C have a stability equivalent to that of the pairs A-T, and / or
- the base pairs A * -T and / or A-T * have a stability greater than that of the pairs A-T and close to that of the natural C-G pairs, or else
- the base pairs C * -G and / or G * -C have a stability equivalent to that of the pairs A * -T and / or A-T *; in this embodiment, the stability of the C * -G and / or G * -C pairs is lowered compared to that of the natural GC pairs and the stability of the A * -T and / or A-T * pairs is increased by compared to that of ' natural A-T pairs.
- the method according to the invention comprises several forms of implementation and in particular the following four.
- a first embodiment of the process of the invention is characterized in that the same type of base entering into the sequence of the first and of the second nucleic acid molecule is a modified base having similar pairing properties those of the natural base which it replaces.
- at least one, same type of base (A, G, C or T) entering into the composition of the first and of the second nucleic acid molecule is a modified base having properties d 'pairing close to that of the natural base it replaces.
- a second embodiment of the method of the invention is characterized in that at least two of the four types of base entering into only one of the first and second nucleic acid molecules are modified bases having properties of pairing close to those of the natural bases which they replace, so that at least one of the two types of base pair entering into the composition of the complex comprises modified bases.
- the method of the invention can be advantageously used for the analysis of nucleic acid sequences, in particular for the sequencing or the detection of mutations.
- One such method consists in producing a hybridization complex, in accordance with the method described above, in which the first nucleic acid molecule constitutes or comprises the sequence to be analyzed and the second nucleic acid molecule is a nucleic probe useful for sequencing or detection of point mutation, then in that the hybridization complex is analyzed by any appropriate means.
- a method of nucleic acid analysis according to the invention is characterized in that one puts in contact the nucleic acids to be analyzed, optionally previously labeled, with an adequate quantity of at least one nucleic probe, then in that any hybridization complexes which are possibly formed are analyzed by any suitable means, in particular in order to identify the presence of mismatch.
- said nucleic acid probe is an oligonucleotide comprising from 4 to 30 nucleosides.
- first nucleic acid molecule into contact with the second nucleic acid molecule which is a nucleic probe useful for sequencing or detecting point mutations, so as to form a hybridization complex in which one of the four basic types entering into the sequence of the first and of the second nucleic acid molecule is a modified base having pairing properties close to those of the natural base which it replaces, so that the one of two types of base pairs entering the composition of the complex comprises a modified base.
- a particular embodiment of the method for analyzing nucleic acid sequences according to the invention is characterized in that the nucleic acid probe has been prepared by a chemical process or biological using at least one type of nucleosides modified so as to obtain a probe whose sequence includes at least one modified base having pairing properties close to those of the natural base which it replaces.
- nucleic probes are targeted in which two of the four types of base entering into their composition are modified bases having pairing properties close to those of the natural bases which they replace.
- nucleosides dC and dG are replaced respectively by nucleosides dC * and dG *
- nucleosides dA and T are replaced respectively by nucleosides dA * and du *
- the first nucleic acid molecule is prepared in accordance with the second embodiment of the method of analysis of acid sequences nucleic acid previously described,
- nucleic acid molecule is prepared in accordance with the second embodiment of the method of analysis of nucleic acid sequences described previously,
- the first nucleic acid molecule is prepared in accordance with the second embodiment of the method of analysis of nucleic acid sequences described previously, - the nucleosides dA and dC are replaced respectively by nucleosides dA * and dC *, in this case, the first nucleic acid molecule is prepared in accordance with the second embodiment of the method for analyzing nucleic acid sequences described above.
- the combinations of modifications envisaged above more particularly preferred are those leading to oligodeoxynucleotides in which:
- nucleosides dC and dG are replaced respectively by nucleosides dC * and dG *.
- the nucleic acid probes constituted by these modified oligodeoxynucleotides are useful for forming hybridization complexes with unmodified complementary nucleic acid sequences.
- this double modification of the oligodeoxynucleotides makes it possible to form hybridization complexes in which all the base pairs G * -C and C * -G have a stability equivalent to that of the base pairs A-T or A-U unmodified.
- All nucleosides dA and T are replaced respectively by nucleosides dA * and dU *.
- nucleic acid probes constituted by these modified oligodeoxynucleotides are useful for forming hybridization complexes with unmodified complementary nucleic acid sequences. Indeed, this double modification of the oligodeoxynucleotides makes it possible to form hybridization complexes in which all the base pairs A * -T and A-U * exhibit a stability close to that of the unmodified G-C base pairs.
- the other doubly modified nucleic probes at the level of only one of the nucleosides of each base pair are useful for forming hybridization complexes with complementary nucleic acid sequences of which the same nucleoside of each base pair also has been replaced by a modified nucleoside, in order to form hybridization complexes whose stability depends little on the base composition.
- the replacement of natural nucleosides present in the target nucleic acids, during this prior modification step can be carried out by any method known to those skilled in the art, such as an enzymatic polymerization reaction carried out with one or more nucleosides modified.
- nucleic probes fixed on a support, such as membranes or threads of cellulose, or of synthetic polymers or even glass surfaces.
- the oligodeoxynucleotides constituting the nucleic probes can then be synthesized directly on the support.
- nucleic acid probes used in the methods for analyzing the above nucleic acid sequences can also be substituted for at least one of their 5 ′ and / or 3 ′ ends, in particular:
- intercalating agents such as derivatives of acridine in order to increase the stability of the hybrids
- nucleosides dC, dG, T and dA Chemical modifications of nucleosides dC, dG, T and dA within the scope of the present invention will be described below.
- a first type of base which can enter into the composition of said first and / or second nucleic acid molecule is a modified deoxycytidine corresponding to the following formula: NH — R
- R represents a hydrogen atom, a C1-C5 alkyl group, an allyl or propargyl group
- Ri represents a hydrogen atom or a group -OH
- X is a nitrogen atom or a group - CH-
- Nucleic acids having dC * in place of dC are useful for forming hybridization complexes with complementary nucleic acid sequences whose natural deoxycytides dC have also been replaced by modified nucleosides dC *, in order to form complexes hybridization in which all the base pairs C * -G exhibit a stability close to that of the unmodified A-T base pairs.
- the natural deoxycytidines can be replaced by dC * defined above, by any method known to a person skilled in the art, such as an enzymatic polymerization reaction carried out with dC * nucleosides.
- a second type of base which can enter into the composition of said first and / or second nucleic acid molecule is a modified deoxyguanosine corresponding to the following formula:
- R represents a hydrogen atom or a C 1 to C 5 alkyl group, an allyl or propargyl group
- R 1 represents a hydrogen atom or a group -OH
- R 2 represents a hydrogen atom or a bromine atom
- X is a nitrogen atom or a group -CH-
- modified deoxyguanosines of formula (II) mention may be made of the following compounds: N-2-methyldeoxyguanosine (d 2Me G), N-2-propyldeoxyguanosine (d 2Pro G), N-2-isopropyldoxy - guanosine (d 2IsoPro G), N-2-ethyldéoxyguanosine
- Nucleic acids comprising dG * in place of dG are useful for forming hybridization complexes with complementary nucleic acid sequences whose natural deoxyguanosines dG have also been replaced by modified nucleosides dG *, in order to form complexes hybridization in which all the G * -C base pairs have a stability close to that of the unmodified A-T base pairs.
- the natural deoxyguanosines present in the target nucleic acid sequence can be replaced by dG * defined above, by all methods known to those skilled in the art, such as an enzymatic polymerization reaction carried out with dG * nucleosides.
- a third type of base which can enter into the composition of said first and / or second nucleic acid molecule is a modified deoxyuridine corresponding to the following formula:
- Ri represents a hydrogen atom or a group -OH
- R represents a group of formula - C ⁇ CH, or - C sc - CH3
- said modified deoxyuridine having pairing properties close to those of natural thymidine qu 'she's replacing.
- modified deoxyuridines of formula (III) above mention may be made of the following compounds: 5-ethynyldoxyoxyidine (d 5Eth V ⁇ y1 U), 5-propynyldoxyoxyidine (d 5Pr ° pyn y 1 U).
- Nucleic acids having dU * in place of T are useful for forming hybridization complexes with complementary nucleic acid sequences whose natural thymidines T have also been replaced by modified nucleosides of *, in order to form complexes of hybridization in which all the base pairs U * -A have a stability close to that of the base pairs GC unmodified.
- the natural thymidines present in the target nucleic acid sequence can be replaced by dU * defined above, by any method known to those skilled in the art, such as a reaction of enzymatic polymerization carried out with nucleosides dU *.
- a fourth type of base which can enter into the composition of said first and / or second nucleic acid molecule is a modified deoxyadenosine corresponding to the following formula:
- R 1 represents a hydrogen atom or a group -OH
- R represents a hydrogen atom or a group NH 2
- X is chosen from a nitrogen atom, the groups of formula: C - Br, C - Cl, C - C ⁇ CH, C - C ⁇ C - CH3, said modified deoxyadenosine having pairing properties close to those of the natural deoxyadenosine which it replaces.
- modified deoxyuridines of formula (IV) above mention may be made of the following compounds: 1-amino-2-deoxyadenosine (d 2NH2 A), 7-deaza-7-bromodesoxyadenosine, 7-deaza-7-propynyl - deoxyadenosine, 1 'amino- 2-7 -de az a- 7- bromo deoxy ⁇ adenosine, 1' amino-2-7-deaza-7-propynyl-deoxyadenosine.
- Nucleic acids comprising dA * in place of dA are useful for forming hybridization complexes with complementary nucleic acid sequences whose natural deoxyadenosine dA have also been replaced by modified nucleosides dA *, in order to form complexes hybridization in which all the base pairs A * -U or A * -T exhibit a stability close to that of the unmodified GC base pairs.
- the natural deoxyadenosines present in the target nucleic acid sequence may be replaced by dA * defined above, by any method known to those skilled in the art, such as an enzymatic polymerization reaction carried out with dA * nucleosides.
- the first and second nucleic acid molecules are of the deoxyribonucleic type.
- methods of forming a hybridization complex and of analyzing the sequence of a nucleic acid according to the invention bringing the first and second nucleic acid molecules into contact in conditions allowing the formation of a specific hybridization complex is carried out in the presence of tetramethylammonium chloride or a derivative thereof functionally equivalent, such as trimethylalkylammonium halides.
- tetramethylammonium chloride or a derivative thereof functionally equivalent such as trimethylalkylammonium halides.
- the invention also relates to a hybridization complex formed from two complementary, or substantially complementary, nucleic acid molecules, the stability of which depends little on the base composition of the two hybridized nucleic acid molecules, characterized in that one at least types of base pair entering into the composition of said complex comprises at least one modified base having pairing properties close to those of the natural base which it replaces, so that all of the base pairs entering into the composition of said complex has a similar stability.
- the hybridization complex of the invention is characterized in that the same type of base entering into the sequence of the first and of the second nucleic acid molecule is a modified base having properties of matching close to those of the natural base which it replaces.
- the invention envisages more particularly the cases where: the hybridization complex is characterized in that one of the four basic types entering into the sequence of the first and of the second acid molecule nucleic acid is a modified base having pairing properties close to those of the natural base which it replaces, so that one of the two types of base pair entering into the composition of the complex comprises a modified base;
- the hybridization complex is characterized in that two of the four types of bases entering into the sequence of the first and of the second nucleic acid molecule are modified bases having pairing properties close to those of the natural bases which 'they replace, so that the two types of base pair used in the composition of the complex include modified bases.
- the hybridization complex of the invention is characterized in that two of the four types of bases entering into only one of the first and second nucleic acid molecules are modified bases having properties of pairing close to those of the natural bases which they replace, so that one of the two types of base pair entering into the composition of the complex comprises a modified base.
- the first or second nucleic acid molecule forming the hybridization complex of the invention is an oligonucleotide probe.
- nucleosides dC, dG, T and dA entering more particularly into the composition of said first and / or second nucleic acid molecule of the complexes of the invention are those described above for the modified deoxycytidine, the modified deoxyguanosine, the deoxyuridine modified, modified deoxyadenosine.
- the 3 'phosphoramidites of the modified nucleosides are commercially available, such as: 5 '-0-dimethoxytrityl-3' -O- (2-cyanoethyl-
- the other modified nucleoside phosphoramidites can also be prepared in the laboratory from other modified nucleosides according to the techniques described in the literature (ND Sinha et al., Nucleic Acid Res., 1984, 12, 4539-4557; J. Nielsen and al. Nucleic Acid Res., 1986, 14, 7391-7403).
- the conversion of 2 '- deoxyuridine to N-4-alkyl-2' - deoxycytidine is carried out in a first step by activating the C 4 position of 2 '- desoxyuridine protected by treatment with phosphorus oxychloride in the presence of triazole followed by treatment with the corresponding primary amines.
- the phosphitylation of the 3' position is carried out using 2-cyanoethyl-N, N-diisopropylamidochlorophosphite.
- (2-cyanoethyl-N, N-diisopropylamidophosphite) -6-aza-2 '- deoxycytidine is produced, for example, from commercial 6-aza-uridine (Sigma), which is deoxygenated in position 2' then converted to 6 - aza-2 'deoxycytidine.
- Selective protection of the 5 'and 3' hydroxyls of 6-aza-uridine is achieved by the action of tetraisopropyldisiloxane chloride.
- the 5 'and 3' hydroxyls are then protected respectively with the dimethoxytrityl and acetyl groups.
- the hydroxyl in position 2 is then transformed into the ester of trifluoromethane sulfonic acid.
- the treatment of the latter with an amine (methylamine, ethylamine ...) leads to corresponding N-2-alkyl-2 '-deoxyguanosine compound.
- Example 1 Preparation of 5 '-0- dimethoxytrityl-3' -O- (2-cyanoethyl-N, N-diisopropylamido phosphite) -N-4-ethyl-2 '-deoxycytidine.
- the reaction mixture is then brought to temperature ambient and stirred for 4 hours.
- Rf 0.26 syst A.
- Rf 0.70 syst B.
- the medium is concentrated under reduced pressure then taken up with dichloromethane and washed with a sodium bicarbonate solution and concentrated under reduced pressure.
- the residue is purified on a column of silica gel in the system [eluent: CH 2 C1 2 / MeOH (98: 2, v / v) to (95: 2: 5, v / vj.
- This compound was obtained in 6 steps from 6-aza-uridine.
- 6-azadesoxyuridine After activation of the 2 'hydroxyl with phenoxythiocarbonyl chloride, deoxygenation is carried out with tin tributyl in the presence of ⁇ , ⁇ azoisobutyronitrite (MJ Robins and JS Wilson, J. Am. Chem. Soc, 1981, 103, 932-933).
- the conversion of 6-azadesoxyuridine to 6-azadesoxycytidine is carried out in a first step by activating the C 4 position of 6-azadesoxyuridine by treatment with phosphorus oxychloride in the presence of triazole followed by treatment with gaseous ammonia (M. Perbostand and YS Sanghvi, J. Chem. Soc. Perkin. Trans. 1, 1994, 2051-2052).
- step (e) leads to the sought phosphoramididite of formula (VI):
- oligonucleotides comprising modified bases can be prepared in solution or on a solid support according to the conventional methods of synthesis of oligonucleoides using the phosphotriester method (J. Stawinski et al., Nucleic Acids
- oligonucleotides can be conveniently made on a solid support.
- the bases are assembled on a synthesizer of oligonucleotides on a CPG (Controlled Pore Glass) support functionalized with a nucleoside according to the phosphoramidite method described by Beaucage and Caruthers.
- the syntheses are carried out on a micromole scale using ten equivalents of commercial phosphoramidites and of modified phosphoramidite (s) prepared as indicated in examples 1 to 10, per cycle.
- the cycle time is close to 10 minutes with a coupling time of 1.5 minutes for the phosphoramidites of natural nucleosides.
- the coupling time of the modified nucleoside phosphoramidite was extended by one minute.
- an additional detrytilation step is carried out to release the terminal primary alcohol function.
- Deprotection is carried out with a concentrated ammonia solution at 50 ° C. overnight. Extraction with ethyl acetate makes it possible to remove the soluble organic compounds. After extraction, the aqueous solution is recovered and concentrated then the products are purified by HPLC.
- the analyzes of the oligomers by ion exchange are carried out on an FPLC device Pharmacia Fine Chemicals (GP 250 / P 3500) with a DEAE Waters column (Protein-Pak TM, DEAE 8HR (10 mm X 100
- the gradients used are gradients in salt (NaCl): 2 minutes at 0% in B; from 0 to 30% in B in 40 minutes; flow rate: 1 ml / min.
- A: 25 mM tris, 10% CH3CN , pH 8; B: buffer A + 1.5 M NaCl.
- reverse phase analyzes are performed on a Waters 625 LC System device equipped with a Waters 990 photoiode detector with a Merck column, LichroCart (125 mm X 4 mm) filled with Lichrospher 100 RP-18 (5 ⁇ m).
- TEAA triethylammonium acetate
- A contains 5% CH 3 CN and B 80% CH 3 CN. Gradients are produced in CH 3 CN: from 0% to 20% in B in 20 minutes. The flow rates of these eluents are 1 ml / minute.
- the reaction is left in a water bath for 2 hours at 37 ° C.
- the pH of the hydrolyzate is then adjusted to pH 9 with a Tris 1M solution.
- alkaline phosphatase 10 ⁇ l of alkaline phosphatase are added to the mixture and incubated for 2 hours at 37 °. C.
- the enzyme is then destroyed by heating by boiling the solution for 1 to 2 minutes, the different compounds formed are then identified and quantified by reverse phase with the following gradient: 0% at B for 5 minutes; from 0% to 9% in B in 15 minutes.
- Flow rate 1 ml / min.
- oliguucleotides No. 11 to 16 were verified by mass spectrometry by the MALDI technique (Matrix-Assisited Laser Desorption; Lasermat apparatus from Finnigan), using dT ⁇ 2 as reference and 1 ⁇ l of a mixture made up. 10 ⁇ l of a 0.5 M solution of 2, 4, 6-trihydroxy acetophenone in ethanol, 5 ⁇ l of a 0.1 M aqueous solution of diammonium-L-tartarate and 1 ⁇ l of an aqueous solution (10 OD / ml) of the sample to be analyzed are deposited on a target and the solvents are removed by evaporation.
- MALDI technique Microx-Assisited Laser Desorption; Lasermat apparatus from Finnigan
- oligonucleotides appearing in Table VI below were prepared using phosphoramidites of natural deoxynucleosides and phosphoramidites of modified nucleosides prepared in the laboratory or obtained commercially.
- the nucleic acid fragments to be analyzed consisting of natural nucleosides and modified nucleoside (s) can be obtained by the technique of genetic amplification PCR using a mixture of triphosphates of natural nucleosides and modified nucleoside (s) ). These compounds can also be obtained by preparing, in a first step, single-stranded natural DNA fragments by the asymmetric PCR technique, then by copying in a second step the single-stranded natural DNA fragment in complementary sequence consisting of natural nucleosides and nucleoside ( s) modified using a mixture of natural desoxynucleoside triphosphate and modified nucleoside (s) and DNA polymerase.
- the deoxynucleosides modified 5 'triphosphates can be prepared from the deoxynucleosides modified in two stages as for natural deosxynucleosides triphosphates.
- the first step concerns the preparation of modified 5 'monosphates deoxynucleosides by reaction of nucleosides modified with phosphorus oxychloride in trialkyphosphate (M. Yoshikawa, T. Kato and T. Takenishi, Tetrahedron Lett., 1967, 5065-5068).
- the second step concerns the activation of the 5 'phosphate by reaction with carbonyldiimidazole then coupling of the activated intermediate with the tributylammonium salt of the pyrophosphate according to DE Hoard and DG Ott (J. Amer. Chem. Soc. 1965, 87, 1785-1788).
- the triphosphates can be obtained from deoxycytidine triphosphate by transamination in the presence of alkyl lamin and bisulfite (PS Miller and CD Cushman, 1992 Bioconjugate Chem., 3, 74 -79).
- Hybridization studies were performed with a KONTRON UVIKON cell changer 941 absorption spectrometer at 260 nm.
- FIGS. 1 and 2 indicate the Tm of the double strands formed between natural tridecadeoxynucleotides and natural nonadesoxynucleotides of a on the one hand and nonadesoxynucleotides comprising a dC * modified deoxycytidine on the other hand.
- the Tm values in FIG. 1 show that for the double strands made up of natural nucleotides, the stability of the hybrids varies greatly with the base composition.
- the replacement of the A-T pair by the GC pair ( Figure 2) in positions 4 and 7 leads to an increase in Tm of the order of 10'C.
- N-4-ethydeoxycytidine and 1-b-D-arabinofuranosyl-cytosine is equivalent to that of my pairings
- cytosines located on the two strands are replaced by N-4-methylcytosine (duplex 42, FIG. 7) or N-4-ethylcytosine (duplex 43).
- duplexes 2 and 41 When the nonadeoxy-nucleotide sequences for example are immobilized on the same solid support, it is not possible to form at the same time time specific hybrids such as duplexes 2 and 41 without formation of mismatched hybrids such as duplexes 14, 21 and 28 which have higher Tm than that of duplex 41.
- duplexes consisting of base pairs A -T and G-CN And makes it possible to obtain specific hybrids such as duplexes 41 and 43, indeed duplex 44 for example which derives from duplex 43 with however a mismatch ⁇ -C NEt is very little stable (Tm ⁇ 10 'VS) .
- duplexes 46 and 47 constituted respectively by 9 pairs A _ ⁇ j5Propynyle and 9 pairs GC 4Met were studied and compared with those of the corresponding unmodified duplexes 41 and 45 (FIG. 8).
- Tm of the modified duplexes 46 and 47 are located between those of the natural duplexes 41 and 47.
- FIG. 9 gives the Tm of the double strands formed between a tridecadeoxynucleotides and nonadesoxynucleotides comprising a modified deoxyguanosine dG *.
- the results obtained show that the replacement of a natural base pair CG by a base pair CG * has an effect on the thermal stability of the hybridization complexes.
- the derivatives substituted on the amino group in position 2 make it possible to modulate the stability of the hybrids.
- the stability of the duplexes containing the cG 2alkyl base pair decreases when the steric hindrance of the substituent increases (duplexes 55, 56, 57, 58).
- the duplex 58 comprising the pair CG 2iPr has a thermal stability close to that of the duplex 52 enclosing the pair TA at the same position.
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Abstract
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JP10502451A JP2000512843A (ja) | 1996-06-27 | 1997-06-25 | 安定性が2個のハイブリッドされた核酸分子の塩基組成に僅かしか依存しないハイブリッド複合体の形成方法 |
EP97930584A EP0954610A1 (fr) | 1996-06-27 | 1997-06-25 | Procede de formation de complexes d'hybridation dont la stabilite depend peu de la composition en base des deux molecules d'acides nucleiques hybridees |
US09/214,403 US6864049B1 (en) | 1996-06-27 | 1997-06-25 | Method for producing hybridization complexes whose stability is substantially independent of the base composition of two hybridized nucleic acid molecules |
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FR9608027A FR2750435B1 (fr) | 1996-06-27 | 1996-06-27 | Procede de formation de complexes d'hybridation dont la stabilite depend peu de la composition en base des deux molecules d'acides nucleiques hybridees |
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Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
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US7144868B2 (en) | 2003-10-27 | 2006-12-05 | Genelabs Technologies, Inc. | Nucleoside compounds for treating viral infections |
US7157434B2 (en) | 2003-10-27 | 2007-01-02 | Genelabs Technologies, Inc. | Nucleoside compounds for treating viral infections |
US7169918B2 (en) | 2003-10-27 | 2007-01-30 | Genelabs Technologies, Inc. | Methods for preparing 7-(2′-substituted-β-D-ribofuranosyl)-4-(NR2R3)-5-(substituted ethyn-1-yl)-pyrrolo[2,3-d]pyrimidine derivatives |
US7202223B2 (en) | 2003-10-27 | 2007-04-10 | Genelabs Technologies, Inc. | Nucleoside compounds for treating viral infections |
US7244713B2 (en) | 2003-10-27 | 2007-07-17 | Genelabs Technologies, Inc. | Nucleoside compounds for treating viral infections |
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JP4538522B2 (ja) * | 2005-11-25 | 2010-09-08 | コーリー ファーマシューティカル ゲーエムベーハー | 免疫刺激性オリゴリボヌクレオチド |
Citations (2)
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EP0176393A1 (fr) * | 1984-08-24 | 1986-04-02 | L'air Liquide, Societe Anonyme Pour L'etude Et L'exploitation Des Procedes Georges Claude | Procédé et installation de production d'air suroxygéné par adsorption |
WO1993005175A1 (fr) * | 1991-09-11 | 1993-03-18 | Medical Research Council | Perfectionnements apportes aux amorces et aux sondes oligonucleotides |
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FR2569407B1 (fr) * | 1984-08-22 | 1989-02-17 | Pasteur Institut | Sondes comportant des groupements adenine modifiee, leur preparation et leurs utilisations |
US5844110A (en) * | 1995-02-01 | 1998-12-01 | University Of Nebraska Board Of Regents | Synthetic triple helix-forming compound precursors |
-
1996
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1997
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- 1997-06-25 WO PCT/FR1997/001131 patent/WO1997049833A1/fr not_active Application Discontinuation
- 1997-06-25 CA CA002258936A patent/CA2258936A1/fr not_active Abandoned
- 1997-06-25 US US09/214,403 patent/US6864049B1/en not_active Expired - Fee Related
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Patent Citations (2)
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EP0176393A1 (fr) * | 1984-08-24 | 1986-04-02 | L'air Liquide, Societe Anonyme Pour L'etude Et L'exploitation Des Procedes Georges Claude | Procédé et installation de production d'air suroxygéné par adsorption |
WO1993005175A1 (fr) * | 1991-09-11 | 1993-03-18 | Medical Research Council | Perfectionnements apportes aux amorces et aux sondes oligonucleotides |
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Title |
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MELCHIOR W B ET AL: "ALTERATION OF THE RELATIVE STABILITY OF DA.DT AND DG.DC BASE PAIRS IN DNA", PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE USA, vol. 70, no. 2, February 1973 (1973-02-01), pages 298 - 302, XP002027509 * |
NGUYEN H ET AL.,: "Modification of DNA duplexes to smooth their thermal stability independently of their base content for DNA sequencing by hybridization", NUCLEIC ACIDS RESEARCH, vol. 25, no. 15, - 1 August 1997 (1997-08-01), pages 3059 - 3065, XP002041341 * |
NGUYEN H-K. ET AL.,: "Studies towards the design of a modified GC base pair with stability similar to taht of the AT base pair", TETRAHEDRON LETTERS, vol. 38, no. 23, - 9 June 1997 (1997-06-09), pages 4083 - 4086, XP002041345 * |
WOOD W I ET AL: "BASE COMPOSITION-INDEPENDENT HYBRIDIZATION IN TETRAMETHYLAMMONIUM CHLORIDE: A METHOD FOR OLIGONUCLEOTIDE SCREENING OF HIGHLY COMPLEX GENE LIBRARIES", PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF USA, vol. 82, no. 3, March 1985 (1985-03-01), pages 1585 - 1588, XP002027508 * |
Cited By (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US7144868B2 (en) | 2003-10-27 | 2006-12-05 | Genelabs Technologies, Inc. | Nucleoside compounds for treating viral infections |
US7151089B2 (en) | 2003-10-27 | 2006-12-19 | Genelabs Technologies, Inc. | Nucleoside compounds for treating viral infections |
US7157434B2 (en) | 2003-10-27 | 2007-01-02 | Genelabs Technologies, Inc. | Nucleoside compounds for treating viral infections |
US7169918B2 (en) | 2003-10-27 | 2007-01-30 | Genelabs Technologies, Inc. | Methods for preparing 7-(2′-substituted-β-D-ribofuranosyl)-4-(NR2R3)-5-(substituted ethyn-1-yl)-pyrrolo[2,3-d]pyrimidine derivatives |
US7202223B2 (en) | 2003-10-27 | 2007-04-10 | Genelabs Technologies, Inc. | Nucleoside compounds for treating viral infections |
US7244713B2 (en) | 2003-10-27 | 2007-07-17 | Genelabs Technologies, Inc. | Nucleoside compounds for treating viral infections |
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JP2000512843A (ja) | 2000-10-03 |
US6864049B1 (en) | 2005-03-08 |
FR2750435B1 (fr) | 1998-08-28 |
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