WO2005028647A1 - 核酸プローブ、核酸チップ、標的核酸検出方法、薬剤スクリーニング方法、標的核酸検出装置及び遺伝子診断方法 - Google Patents
核酸プローブ、核酸チップ、標的核酸検出方法、薬剤スクリーニング方法、標的核酸検出装置及び遺伝子診断方法 Download PDFInfo
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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
- C12Q1/6813—Hybridisation assays
- C12Q1/6827—Hybridisation assays for detection of mutation or polymorphism
- C12Q1/683—Hybridisation assays for detection of mutation or polymorphism involving restriction enzymes, e.g. restriction fragment length polymorphism [RFLP]
Definitions
- Nucleic acid probe, nucleic acid chip, target nucleic acid detection method, drug screening method, target nucleic acid detection device, and gene diagnosis method are provided.
- the present invention relates to a nucleic acid probe capable of detecting a trace amount of a target nucleic acid having extremely high selectivity for a target nucleic acid with high sensitivity and accuracy by amplifying a signal generated by a nucleic acid probe force hybridized to the target nucleic acid.
- the present invention relates to a nucleic acid chip having a nucleic acid probe immobilized thereon, and a target nucleic acid detection method, a drug screening method, a target nucleic acid detection device, and a gene diagnosis method using the nucleic acid probe.
- the target nucleic acid probe and the DNA chip used in the genetic diagnosis it is difficult to analyze a minute amount of the target nucleic acid. Therefore, in order to perform the genetic diagnosis, the target nucleic acid is subjected to PCR. Must be amplified. However, when the PCR method is used to amplify a small amount of the target nucleic acid, skill is required. Conventionally, the amplification of the target nucleic acid is insufficient, and in many cases, the target nucleic acid cannot be detected. There was a problem. Technology that overcomes this problem and enables high-sensitivity and high-speed analysis of minute amounts of target nucleic acid Is essential for the development of the genetic diagnosis.
- Such a technique capable of analyzing a trace amount of a target nucleic acid with high sensitivity and high speed is necessary not only for the above-mentioned genetic diagnosis but also for blood transfusion.
- the ability to test whether blood is infected with viruses such as HIV, HBV, and HCV is necessary.
- viruses such as HIV, HBV, and HCV.
- an antibody against the virus is detected, and the antibody is not produced for one to two months after infection with the virus. The problem is that it is not possible to prevent the occurrence of a so-called window period.
- a technique capable of analyzing a virus (target nucleic acid) with high sensitivity and high speed which is present in a very small amount, such as in the early stage of virus infection, is necessary to prevent the occurrence of the window period in the blood transfusion. It is very important for early detection and early treatment of all infectious diseases, mental illness, cancer, etc.
- a nucleic acid probe capable of detecting a small amount of a target nucleic acid by amplifying a signal that is not the same by the PCR method has been disclosed (see Japanese Patent Application Laid-Open No. 2003-525631).
- a sensor molecule that hybridizes with the target nucleic acid and a reporter molecule that can be enzymatically cleaved by the DNAzyme activity of the sensor molecule and generate a signal are used in combination.
- the reporter molecule When the reporter molecule is continuously cleaved from the sensor molecule, the signal of the reporter molecule is amplified, and the presence of a trace amount of the target nucleic acid is detected by detecting the amplified signal. be able to.
- the nucleic acid probe In the case of the nucleic acid probe, a false positive reaction occurs, in which the reporter molecule is cleaved by the sensor molecule before hybridization with the target nucleic acid.
- the selectivity of the target nucleic acid is not sufficient if the sensor molecule is close to the base sequence of the target nucleic acid and the nucleic acid is erroneously recognized as the target nucleic acid and is hybridized. In other words, in this method, the operation is complicated, and there is a problem that the sensitivity and the accuracy are not sufficient, and there are erroneous detections and the reliability is low.
- Non-Patent Document 1 Imaging of RNA in Bacteria with Self-Ligating Quenched
- the present invention solves the problems in the past, and is present only in a very small amount, such as in the early stage of virus infection! /, To a technique capable of analyzing viruses (target nucleic acids) with high sensitivity and high speed, and to live cells. Technology that can quantitatively and rapidly diagnose the effects (gene expression and suppression), and technologies that enable amplification of signals that could not be achieved with the aforementioned nucleic acid probe ⁇ QUAL probe ''. The task is to achieve it.
- the present invention amplifies a signal generated by the force of a nucleic acid probe hybridized to a target nucleic acid to detect and analyze a very small amount of a target nucleic acid having extremely high selectivity for the target nucleic acid with high sensitivity, high accuracy, high speed, and easily. It is possible to measure the presence or behavior of the target nucleic acid even if the target nucleic acid is very small and has a short life, etc., and it can be used for genetic diagnosis, presence of food poisoning bacteria, diagnosis of caries or periodontal disease, blood test, etc. It is an object of the present invention to provide a nucleic acid probe suitable for the above.
- the present invention enables highly sensitive detection of a very small amount of a target nucleic acid by immobilizing the nucleic acid probe on a carrier, and enables genetic diagnosis, inspection for the presence of food poisoning bacteria, diagnosis of caries or periodontal disease, and blood test. It is an object of the present invention to provide a nucleic acid chip suitable for such as.
- the present invention enables high-sensitivity, high-precision, high-speed detection or analysis of a minute amount of a target nucleic acid by using the nucleic acid probe, genetic diagnosis, inspection for the presence of food poisoning bacteria, and diagnosis of caries or periodontal disease.
- nucleic acid and target nucleic acid suitable for blood test, etc. It is intended to provide an ejection device.
- Another object of the present invention is to provide a drug screening method that can analyze the effect of administering a drug by using the nucleic acid probe and that can efficiently screen a desired drug.
- Another object of the present invention is to provide a gene diagnosis method capable of diagnosing the presence of a gene associated with a specific disease with high efficiency and high accuracy by using the nucleic acid probe.
- nucleic acid probe of the present invention examples include the following first to sixth nucleic acid probes.
- the first nucleic acid probe is a nucleic acid probe for detecting a target nucleic acid, and the nucleic acid probe undergoes a structural change after being hybridized to the target nucleic acid, and the structurally changed nucleic acid probe is hybridized. It is designed to reduce the binding force of the dimension and to dissociate it from the target nucleic acid.
- the first nucleic acid probe undergoes a structural change when hybridized to the target nucleic acid. Then, the nucleic acid is dissociated from the target nucleic acid to generate a signal such as luminescence.
- the second nucleic acid probe is a nucleic acid probe for detecting a target nucleic acid, and is capable of forming an autologous nucleic acid enzyme with a complementary site having a sequence complementary to at least a part of the base sequence of the target nucleic acid. And a nucleic acid enzyme formation site.
- the complementary site hybridizes with the target nucleic acid
- the second nucleic acid probe undergoes a structural change, and the nucleic acid enzyme-forming site can form a self-nuclease.
- the nucleic acid probe is cleaved by the self-nucleic acid enzyme and dissociated from the target nucleic acid to generate a signal such as luminescence.
- the third nucleic acid probe is capable of hybridizing to a target nucleic acid, and has a structure variable portion whose structure can be changed when hybridized to the target nucleic acid. Characterized in that the target nucleic acid can be dissociated when its structure changes. When the third nucleic acid probe is hybridized to the target nucleic acid, the structure of the structure variable portion changes. Then, the nucleic acid probe is cleaved, etc. Dissociation from the target nucleic acid produces a signal such as luminescence.
- the fourth nucleic acid probe is capable of hybridizing to the target nucleic acid, has a cleavage portion that is cleaved when hybridized to the target nucleic acid, and hybridizes to the target nucleic acid. It is characterized in that it is possible to form a cutting active region having a cutting activity for the cutting portion when being quenched.
- the fourth nucleic acid probe is hybridized to the target nucleic acid, the cleavage active region is formed, and the cleavage portion is cleaved. Then, the nucleic acid probe is cleaved or the like and dissociated from the target nucleic acid, thereby generating a signal such as luminescence.
- the fifth nucleic acid probe is capable of hybridizing to a target nucleic acid, and upon hybridization to the target nucleic acid, is cleaved to allow the target nucleic acid to be dissociated. It is characterized by having a cleavage part for generating two probe fragments and a signal generation part for generating a signal.
- the signal generating portion does not generate a signal (e.g., light emission) before the hybridization to the target nucleic acid.
- the signal (emission or the like) is generated as a result of the signal generation section force signal, and the presence of the target nucleic acid is detected by detecting the signal (emission or the like).
- the fifth nucleic acid probe also generates a signal (e.g., luminescence) when the target nucleic acid is successively subjected to hybridization, and the signal is amplified in a short time (one target nucleic acid). Even if the amount of the target nucleic acid is very small, its presence can be detected with high sensitivity, high accuracy, and high speed, because a large number of signals (e.g., light emission) are generated.
- a signal e.g., luminescence
- the sixth nucleic acid probe is capable of hybridizing to a target nucleic acid, has a cleavage portion that is cleaved when the target nucleic acid is hybridized, and has a Until the hybridization, a part of the molecule is hybridized with each other to form a mouth structure.
- a part of the sixth nucleic acid probe in the molecule forms a lock structure by hybridization with the target nucleic acid.
- the sixth nucleic acid probe hybridizes to the target nucleic acid.
- the dissociation the complementary bonds of the portions of the lock structure that are hybridized to each other are dissociated. Then, the cutting portion is easily cut, and the cutting portion is cut. As a result, a signal such as light emission is generated.
- the first force sixth nucleic acid probe sequentially hybridizes to the target nucleic acid, and each time, the structure changes and is cleaved to generate a signal such as luminescence. Because the target nucleic acid is amplified in a short time (a single target nucleic acid generates a large number of signals), even if the amount of the target nucleic acid is extremely small, its presence can be detected with high sensitivity, high accuracy, and high speed.
- the nucleic acid chip of the present invention is characterized in that the nucleic acid probe of the present invention is fixed on a carrier.
- the nucleic acid probe immobilized on the nucleic acid chip does not generate the signal before it is hybridized to the target nucleic acid, but when the target nucleic acid is hybridized to the target nucleic acid, As a result of the generation of a signal (emission or the like) from the signal generation portion, for example, the presence or absence of the target nucleic acid is detected by detecting the presence or absence of the signal (emission or the like).
- the nucleic acid chip of the present invention even if the amount of the target nucleic acid is extremely small, its presence is detected with high sensitivity, high accuracy and high speed.
- the target nucleic acid detection method of the present invention includes the following first to third target nucleic acid detection methods.
- the first method for detecting a target nucleic acid is a method for detecting a target nucleic acid using a nucleic acid probe, wherein the nucleic acid probe undergoes a structural change after hybridization to the target nucleic acid,
- the altered nucleic acid probe is characterized in that it is designed to reduce the binding force of the hybridization and dissociate from the target nucleic acid.
- the second method for detecting a target nucleic acid uses a nucleic acid probe having a complementary site having a sequence complementary to at least a part of the base sequence of the target nucleic acid, and a nucleic acid enzyme-forming site capable of forming a self-nuclease.
- a method for detecting a target nucleic acid comprising: a hybridization step of complementarily binding the nucleic acid probe to a target nucleic acid; and after forming the hybridization, the self-nucleic acid enzyme is formed.
- a detecting step of detecting In the method for detecting a target nucleic acid, the nucleic acid probe is complementarily bound to the target nucleic acid before the step of forming the target nucleic acid and the hybridization.
- the dissociation step after the formation of the hybridization, the self-nucleic acid enzyme is formed, and the structure of the nucleic acid probe is changed. As a result, the binding force of the hybridization is reduced, and the nucleic acid probe is changed to the target nucleic acid. Dissociate.
- the detection step at least a part of the nucleic acid probe dissociated in the dissociation step is detected. As a result, the presence or absence of the target nucleic acid is detected.
- the third method for detecting a target nucleic acid includes a step of hybridizing the nucleic acid probe of the present invention to a target nucleic acid, an hybridization step, and a step of hybridizing the nucleic acid probe when the nucleic acid probe is hybridized to the target nucleic acid. Detecting the presence of the target nucleic acid by detecting the generated signal.
- the target nucleic acid detection method in the hybridization step, the nucleic acid probe of the present invention is hybridized to a target nucleic acid.
- the target nucleic acid detection step! The presence or absence of the target nucleic acid is detected by detecting the presence or absence of the signal generated by the nucleic acid probe force upon hybridization to the target nucleic acid.
- the target nucleic acid detection step when the nucleic acid probe is cleaved when the target nucleic acid is hybridized, of the first probe fragment and the second probe fragment, In the case of the target nucleic acid detection step in which the presence or absence of the target nucleic acid is detected by detecting the presence or absence of light emission of the existing light emitting part, the target nucleic acid detection step is performed when hybridization is performed.
- the cut portion of the nucleic acid probe is cut to be divided into the first probe fragment and the second probe fragment, and the first probe fragment and the second probe fragment are separated from the target nucleic acid.
- the light emitting unit is separated from each other, is present in the first probe fragment, and detects the light emission generated by the light emitting unit that has not been affected by the quenching unit. The presence or absence of the nucleic acid is detected.
- the drug screening method of the present invention includes a hybridization step of hybridizing the nucleic acid probe of the present invention to a target nucleic acid expressed by drug administration; A target nucleic acid detection step for detecting the presence or absence of the target nucleic acid by detecting the presence or absence of the signal generated by the nucleic acid probe force when hybridized to the target nucleic acid. It is characterized by screening for drugs based on the presence or absence of the drug.
- the nucleic acid probe of the present invention in the hybridization step, when the target nucleic acid is expressed by the administration of the drug, the nucleic acid probe of the present invention is hybridized to the target nucleic acid. When the nucleic acid is not expressed, the nucleic acid probe of the present invention does not hybridize to the target nucleic acid.
- the target nucleic acid detection step the presence of the target nucleic acid is detected by detecting a signal in which the nucleic acid probe force is also generated due to hybridization to the target nucleic acid. Is detected.
- a desired drug is screened based on the presence or absence of the expression of the target nucleic acid.
- the nucleic acid probe is cleaved after being hybridized to the target nucleic acid, and the luminescence of the luminescent substance present in the first probe fragment out of the first probe fragment and the second probe fragment is generated.
- the target nucleic acid detection step of detecting the presence of the target nucleic acid by detecting the target nucleic acid in the target nucleic acid detection step, after the hybridization to the target nucleic acid, the cleavage portion of the nucleic acid probe Is cleaved to be divided into the first probe fragment and the second probe fragment, and at least one of the first probe fragment and the second probe fragment is separated from the target nucleic acid.
- Examples of the target nucleic acid detection device of the present invention include the following first and second target nucleic acid detection devices.
- the first target nucleic acid detection device includes a nucleic acid probe for detecting a target nucleic acid in a sample.
- a nucleic acid analysis device having a probe immobilized on a carrier, wherein the nucleic acid probe undergoes a structural change after being hybridized to a target nucleic acid, and the nucleic acid probe having the changed structure is capable of binding the hybridization. It is designed to reduce the force and to dissociate the target nucleic acid.
- the second target nucleic acid detection device includes a hybridization means for hybridizing the nucleic acid probe of the present invention to a target nucleic acid, an hybridization means, and the nucleic acid probe force when hybridized to the target nucleic acid.
- a target nucleic acid detecting means for detecting the presence of the target nucleic acid by detecting the generated signal.
- the second target nucleic acid detection device includes a database unit that stores a gene information database, a data analysis unit that compares and analyzes the detection result data of the target nucleic acid detection unit with the gene information data stored in the database unit.
- a communication unit communicable with the Internet and capable of accessing the genetic information database on the Internet, detection result data of the target nucleic acid detecting means, A data analysis unit for comparing and analyzing the genetic information data of the genetic information database; and And more preferably the patient's genetic information.
- the nucleic acid probe of the present invention is hybridized to the target nucleic acid by the hybridization means.
- the target nucleic acid detection means detects a signal generated by the nucleic acid probe force upon hybridization to the target nucleic acid, and detects the presence of the target nucleic acid.
- the target nucleic acid detection means hybridizes to the target nucleic acid
- the nucleic acid probe is cleaved.
- the first probe fragment and the second probe fragment are formed of the luminescent substance present in the first probe fragment.
- the target nucleic acid detecting means detects the presence of the target nucleic acid by detecting luminescence
- the target detecting means hybridizes to the target nucleic acid, and then detects the cleavage portion in the nucleic acid probe. Is cleaved to be divided into the first probe fragment and the second probe fragment, and the first probe fragment and the second probe fragment are separated from the target nucleic acid.
- the light-emitting unit is separated from the light-emitting unit and detects light emitted from the light-emitting unit that is present in the first probe fragment and is no longer affected by the quenching unit. As a result, the presence of the target nucleic acid is detected.
- the gene diagnosis method of the present invention includes a target nucleic acid expression level quantification step for quantifying the expression level of a target nucleic acid relating to a specific disease in a subject using the target gene detection apparatus of the present invention.
- the expression level of the target nucleic acid relating to the specific disease is compared with the expression level of the target nucleic acid relating to the specific disease in a healthy subject and the expression level of a patient contained in the genetic information database by a data analysis unit. Diagnosing whether or not the patient is a patient with a specific disease.
- the gene diagnosis method of the present invention includes a target nucleic acid expression level quantification step for quantifying the expression level of a target nucleic acid relating to a specific disease in a subject using the target gene detection apparatus of the present invention.
- the expression level of the target nucleic acid relating to the specific disease is compared with the expression level of the target nucleic acid relating to the specific disease in a healthy subject and the expression level of a patient contained in the genetic information database by a data analysis unit. Diagnosing whether or not the patient is a patient with a specific disease.
- the expression level of the target nucleic acid relating to a specific disease in the subject is quantified using the target gene detection device of the present invention.
- the diagnosis step the expression level of the target nucleic acid relating to the specific disease in the subject and the expression level of the target nucleic acid relating to the specific disease in a healthy subject and the expression level of a patient included in the genetic information database are analyzed. A comparison is made by the section to determine whether the subject is a patient with the specific disease.
- FIG. 1 is a conceptual diagram showing an example of a process of a target nucleic acid detection method of the present invention using a nucleic acid probe of the present invention.
- FIG. 2 is a schematic explanatory view showing one example of a nucleic acid probe of the present invention (Example 1).
- FIG. 3 is a schematic diagram showing a state in which a nucleic acid probe of the present invention (Example 1) has been hybridized to a target nucleic acid.
- FIG. 4 is a graph showing the results in Example 1 in which the target nucleic acid method of the present invention using the nucleic acid probe of the present invention was performed.
- FIG. 5A shows an example of the nucleic acid probe of the present invention having a stem-loop structure until it hybridizes to the target nucleic acid (right figure), and a state in which the nucleic acid probe has hybridized to the target nucleic acid ( (Left figure).
- FIG. 5B is a schematic diagram showing a one-dimensional structure of the nucleic acid probe of FIG. 5A.
- FIG. 6 is a conceptual diagram showing an example of a process (emission amplification) of a method for detecting a target nucleic acid of the present invention using a nucleic acid probe of the present invention having a stem-loop structure.
- FIG. 7 is a conceptual diagram showing an example of the drug screening method of the present invention using the nucleic acid probe of the present invention.
- FIG. 8 is a conceptual diagram showing another example of the drug screening method of the present invention using the nucleic acid probe of the present invention.
- FIG. 9 is a block diagram showing an example of the target nucleic acid detection device of the present invention using the nucleic acid probe of the present invention.
- FIG. 10 is photographic data showing the results (detection results of luminescence) of Example 3 in which the method for detecting a target nucleic acid of the present invention using the nucleic acid probe of the present invention was performed.
- FIG. 11 is photographic data showing the results of Example 5 in which the method for detecting a target nucleic acid of the present invention using the nucleic acid probe of the present invention was performed.
- FIG. 12 is a conceptual diagram showing a form of hybridization in Example 6 in which the method for detecting a target nucleic acid of the present invention using the nucleic acid probe of the present invention was performed.
- FIG. 13 is photographic data showing the results of Example 6 in which the method for detecting a target nucleic acid of the present invention using the nucleic acid probe of the present invention was performed.
- the nucleic acid probe of the present invention can be hybridized to a target nucleic acid, and as the nucleic acid probe, the first to sixth nucleic acid probes are preferably characterized by the first to sixth nucleic acid probes. Those having two are more preferable. Those having three are particularly preferable.
- the nucleic acid probe of the present invention has the characteristics of the first to sixth nucleic acid probes. In addition to the above, there may be other parts or the like appropriately selected according to the purpose to which no particular restrictions apply.
- FIG. 1 is a conceptual diagram illustrating an example of a reaction cycle in the nucleic acid detection method of the present invention
- FIG. 2 is a schematic diagram illustrating an example of a nucleic acid probe of the present invention
- FIG. 4 is a schematic diagram showing a state where a probe has hybridized to a target nucleic acid
- FIG. 4 is a graph showing a result of a target nucleic acid detection reaction according to one embodiment of the present invention.
- the first nucleic acid probe undergoes a structural change after being hybridized to the target nucleic acid, and the structurally changed nucleic acid probe has a reduced binding force of the hybridization, and Force Designed to dissociate.
- a cycle including binding or dissociation of a nucleic acid probe is formed on the molecule of the target nucleic acid 1.
- the nucleic acid probe 2 and the target nucleic acid 1 come into contact with each other, they hybridize with each other to form a complex (A).
- the hybridized nucleic acid probe 2 forms a self-nuclease 7, and the self-nuclease 7 cleaves at a cleavage site 12 having a specific sequence (B).
- the cleaved nucleic acid probe cannot maintain the binding state with the target nucleic acid 1 and dissociates spontaneously (C).
- the fluorescent substance F loses its interaction with the quencher Q and emits fluorescence.
- a new nucleic acid probe 2 hybridizes again to the free target nucleic acid 1, and the fluorescent signal is amplified by repeating the processes (A) to (C).
- the detection signal is amplified on one molecule of the target nucleic acid, the target nucleic acid 1 can be detected with high sensitivity even when the target nucleic acid 1 has a very small amount or a short lifetime.
- the nucleic acid probe of the present invention is directly introduced into living cells, and the processes (A) to (C) are allowed to proceed. Is also possible. Therefore, according to the present invention, “recognition”, “signal amplification”, and “diagnosis” of a target nucleic acid such as a gene can be performed in a cell, and for example, the relationship between the administered drug and the expression or suppression of the gene thereby can be determined. Screening for direct observation becomes possible. Furthermore, since there is no need for gene amplification or reaction temperature control by PCR or the like, special equipment and facilities such as laboratories and analytical instruments are not required, and they can be used outside homes, schools, workplaces, and other medical facilities. Can also perform genetic diagnosis.
- the “target nucleic acid” as used in the present invention means a nucleic acid or gene for quantitative, qualitative detection, or simple detection, and can be in either purified or unpurified state. Including.
- the target nucleic acid may be of any type, and examples include RNA, DNA, PNA, and artificially modified nucleic acids.
- the base sequence of the target nucleic acid can be determined by, for example, the Max. Gilbert method, the dideoxy method and the like.
- the structural change of the nucleic acid probe of the present invention preferably includes the formation of a self-nucleic acid enzyme.
- the nucleic acid probe of the present invention preferably has a labeling substance. This makes it possible to more easily confirm the presence of the target nucleic acid. Further, it is more preferable that the strong labeling substance emits different signals before and after the nucleic acid probe dissociates from the target nucleic acid. Details regarding the labeling substance will be described later.
- the second nucleic acid probe can form a self-nucleic acid enzyme with complementary sites 3a and 3b having a sequence complementary to at least a part of the base sequence of the target nucleic acid.
- the third nucleic acid probe has a cleavage portion 12 as a structure variable portion whose structure can be changed when hybridized to the target nucleic acid,
- the structure of the structure variable portion changes, that is, when the cleavage portion 12 is cut, the target nucleic acid can be dissociated.
- the fourth nucleic acid probe has a cleavage portion 12 that is cleaved when hybridized to the target nucleic acid, and when the target nucleic acid is hybridized to the target nucleic acid. Can form a cleavage active region 7 having cleavage activity for the cleavage portion 12 It is.
- a signal generating unit 8 for generating a signal.
- FIG. 2 is a view showing a state where the target nucleic acid is extended to a main strand
- FIG. 3 is a view showing a state where the target nucleic acid is hybridized.
- the nucleic acid probe 2 is capable of hybridizing to the target nucleic acid, and has the nucleotide sequences 3a and 3b, the nucleic acid enzyme formation site 6, and the luminescence which is the signal generation portion 8.
- the nucleotide sequences 3a and 3b are regions that can hybridize to the target nucleic acid 1, and are located at both ends of the nucleic acid probe 2.
- the nucleic acid enzyme forming site 6 shown in FIG. 2 forms the cleavage active region 7 when the nucleic acid probe 2 is hybridized to the target nucleic acid 1 as shown in FIG. Expresses cleavage activity.
- a part of the molecule is hybridized, specifically, a part of the nucleic acid probe 2 at the center (between) with the cut part 12 on both sides thereof is hybridized ( Y and Z in Fig. 3).
- the cleavage part 12 is formed of ribonucleic acid (the sugar in the nucleotide is ribose), and can be cleaved by the ribozyme activity expressed by the cleavage active region 7.
- the luminescent material F and the quenching material Q are located adjacent to each other with the cut portion 12 at the center (between), as shown in FIGS.
- each of the second to fifth nucleic acid probes can function as a target nucleic acid, such as a self-cleaving gene diagnosis probe, for example, an arosteritus effector.
- a target nucleic acid such as a self-cleaving gene diagnosis probe, for example, an arosteritus effector.
- Each fragment of the self-cleaved nucleotide cannot maintain complementary binding (hybridization) to the target nucleic acid at isothermal temperature, and dissociates spontaneously.
- the new nucleic acid probe hybridizes to the target nucleic acid, forms a self-nuclease, and dissociates.
- a detection signal typified by a fluorescent signal or the like is amplified.
- Each of the second to fifth nucleic acid probes can be introduced into living cells without the need to add a special enzyme or reagent to form a self-nucleic acid enzyme. Therefore, the use of each of the second to fifth nucleic acid probes makes it possible to observe the behavior of single-molecule-level nucleic acids and genes in cells.
- the nucleic acid probe 2 when the target nucleic acid 1 is present, the nucleic acid probe 2 has complementary base sequences 3a and 3b capable of hybridizing to the target nucleic acid 1 at both ends. Therefore, when the nucleotide sequences 3a and 3b are hybridized to the nucleic acid sequence 1 (A in FIG. 1), the nucleic acid enzyme formation site 6 becomes a three-dimensional confirmation.
- the cleavage active region 7 is formed by the cleavage, the cleavage activity (ribozyme activity) for the cleavage portion 12 is generated, the cleavage portion 12 (ribose portion) is cleaved (self-cleaved), and the first probe having the luminescent substance F
- the fragment is divided into a fragment and a second probe fragment having a quencher Q (B in Fig. 1), and each fragment is dissociated from the target nucleic acid 1.
- the quencher F and the quencher F that are located adjacent to each other are separated.
- the substance Q comes to be separated from each other ( C in Figure 1).
- the light-emitting substance F and quencher Q when having been positioned adjacent to each other, the light co 1] E non Honoré 3 ⁇ ⁇ (fluorescence resource energy transfer to definitive therebetween: a FREl movement, the light-emitting substance F Although the luminescence was in the quenching state 8 due to the action of the quenching substance Q, the fluorescence resonance energy transfer disappeared, the quenching action of the quenching substance Q stopped working, and the luminescent substance F began to emit light (FIG. 1). C) This luminescence is generated each time the nucleic acid probe hybridizes to the target nucleic acid 1, and this reaction is repeated (catalytic process, cycle A—C in FIG. 1) and amplified.
- the nucleic acid probe 2 when the nucleic acid probe 2 is cleaved, the first probe fragment and the second probe fragment cannot maintain the hybridization, and when dissociated from the target nucleic acid 1, the target nucleic acid 1 becomes To be free
- the new nucleic acid probe 2 hybridizes and repeats the cycle of A to C in Fig. 1.
- the nucleic acid probe 2 can use the target nucleic acid 1 as an aosteric effector. Even if the nucleic acid 1 has a very small amount (10 ng Zwl) or a short life, the presence thereof can be easily detected visually or the like by amplifying the luminescence generated by the nucleic acid probe.
- nucleic acid probe 2 can be directly introduced into living cells for hybridization, and can be hybridized to viruses. Therefore, according to the nucleic acid probe 2, a very small amount of the target nucleic acid existing in the cell can be detected.
- FIG. 5A, FIG. 5B and FIG. 6 are schematic explanatory diagrams showing an example of the sixth nucleic acid probe.
- the sixth nucleic acid probe can be hybridized to a target nucleic acid and is cleaved when hybridized to the target nucleic acid. It has a cleavage part (rA), and until it hybridizes to the target nucleic acid, a part of the molecule hybridizes with each other to form a lock structure (stem loop structure).
- rA cleavage part
- this nucleic acid probe is composed of two base sequences (5, 5 at the end, XGTAGGAGT3, and 3, 3 at the end, YGTGCCAGG5 ') capable of hybridizing with the target nucleic acid and a cleavage activity.
- This nucleic acid probe forms the lock structure (stem-loop structure) before hybridizing to the target nucleic acid, as shown in FIGS. 5A, 5B, and 6.
- the adenine (A) oligomer is present at the 5 ′ end of the nucleic acid probe at the extreme end, and the thymine (T) oligomer is present at the 3 ′ end but at the extreme end of the nucleic acid probe. Therefore, as shown in FIGS. 5A, 5B and 6, the lock structure has a stem-loop structure.
- the nucleic acid probe having the stem-loop structure has a state in which the 3 ′ end side protrudes from the stem-loop structure.
- the nucleic acid probe having the stem loop structure does not form the cleavage active region, and the cleavage portion (rA: base is adenine). Does not cause cleavage at the sugar (ribose) structure Yes. For this reason, the nucleic acid probe does not have a risk of erroneous detection or the like, which prevents a cleavage active region from being formed and cutting the cleavage portion before the nucleic acid is hybridized to the target nucleic acid.
- the present invention has such a lock structure (stem-loop structure), and does not express the cleavage activity of the cleavage portion before hybridizing to the target nucleic acid.
- the nucleic acid probe may be referred to as a “Locked TASC” probe.
- the nucleic acid probe of the present invention having no stem-loop structure as described above is sometimes referred to as a “TASCJ probe”.
- the nucleic acid probe ie, the “Locked TASC” probe
- the locked structure a self-nucleic acid enzyme
- the lock structure is not formed while the cleavage active region is formed.
- the nucleic acid probe may undergo a large shape or structural change between the shape or structure that forms the cutting active region and the shape or structure that forms the cleavage active region. Required.
- the affinity (binding power, hybridization power) of the two base sequences capable of hybridizing with the target nucleic acid to the target nucleic acid is better than that of the lock structure ( It is designed to have an affinity (binding strength, hybridization force) greater than that of the stem-loop structure). Therefore, the nucleic acid probe adopts the lock structure (stem-loop structure) before it is hybridized to the target nucleic acid.
- the two base sequences capable of hybridization interact with their complementary sites in the target nucleic acid, and the affinity of the two base sequences for the target nucleic acid (binding power, hybridization power) Since the lock structure (stem-loop structure) is easily released due to large (strong), the nucleic acid probe is capable of being hybridized to the target nucleic acid with a large shape or structural change. Become.
- nucleic acid probes capable of hybridizing with the target nucleic acid Affinity (binding power, hybridization power) of the base sequence for the target nucleic acid hereinafter referred to as “
- A2 and the affinity (binding force, hybridization force) (hereinafter referred to as“ A1 ”) in the lock structure (stem-loop structure) are determined by hybridization with the target nucleic acid.
- the number can be appropriately adjusted depending on the number of possible base sequences, the number of base sequences of complementary strands in the lock structure, the number of hydrogen bonds between bases (2 or 3) during hybridization, and the like.
- the number of two base sequences capable of hybridizing with the target nucleic acid is complemented by the complementation in the lock structure. What is necessary is just to make it larger than the number of base sequences of a chain.
- the number of A1 is "5"
- the number of A2 is three times the number of A1. Strong, slightly less than 4 times.
- the one-dimensional cleavage active region as shown in Fig. 5B is, as shown in Figs. 5A and 6, the cleavage activity when the nucleic acid probe is hybridized to the target nucleic acid. A region is formed, and a cleavage activity for the cleavage site (the site represented by rA in FIG. 5A and the site represented by Q in FIG. 6) is expressed.
- a part of the molecule is hybridized, specifically, a part of the both sides of the nucleic acid probe with the cut portion at the center (between). (Both sides of rA in Fig. 5A, both sides of the site represented by Q in Fig. 6B and Fig. 6C).
- the cleavage portion is formed of ribonucleic acid (the sugar in the nucleotide is ribose), and can be cleaved by the ribozyme activity expressed by the cleavage active region.
- the luminescent material F and the quenching material Q are positioned adjacent to each other while the lock structure (stem-loop structure) is being taken. Is quenched by the action of the quenching substance Q.
- the nucleic acid probe is a complementary nucleic acid that can hybridize to the target nucleic acid when the target nucleic acid is present. Since the two base sequences are present at both ends (see FIGS. 5A and 6B), when the two base sequences hybridize to the nucleic acid sequence (FIGS. 5A and 6B). ), The cleavage active region is formed, and a cleavage activity (ribozyme activity) for the cleavage portion is generated. (In C of FIG.
- the cleavage activity is expressed or improved by the magnesium ion being located at the center of the cleavage active region), and the cleavage portion (ribose portion) is cleaved (self-cleaved). Then, it is divided into a first probe fragment having the luminescent substance F and a second probe fragment having the quencher Q (D in FIG. 6), and each is dissociated with the target nucleic acid.
- the luminescent substance F and the quenching substance Q which were located adjacent to each other, would be located away from each other when the nucleic acid probe hybridized to the target nucleic acid (see FIG. 6).
- the quenching action of the quenching substance Q stops working, and the luminescent substance F emits light.
- the luminescence by the luminescent substance F occurs every time the nucleic acid probe contacts the target nucleic acid, and this reaction is repeated (AD cycle in FIG. 6) to be amplified.
- the target nucleic acid has a very small amount ( ⁇ 10 ngZ / n) or a short life, the presence of the target nucleic acid can be easily detected visually or the like by amplifying the luminescence generated by the nucleic acid probe.
- the nucleic acid probe of the present invention may be entirely formed of a nucleotide chain, or may be partially formed of a nucleotide chain.
- the portion other than the above portion may be formed by, for example, an amino acid chain, a sugar chain, a synthetic polymer chain, or the like. Among these, from the viewpoint of production efficiency and the like, it is preferable that all of them are formed by nucleotide chains.
- the method for producing the nucleotide chain in the nucleic acid probe is not particularly limited and may be appropriately selected depending on the purpose. Examples thereof include a chemical synthesis method, a plasmid vector, and a microorganism using a phage vector. Method, a mechanical synthesis method using a nucleic acid synthesizer, and the like. Of these, the mechanical synthesis method is preferable because of its excellent mass productivity.
- the nucleotide sequence number (full length) of the nucleotide chain in the nucleic acid probe The restriction can be appropriately selected depending on the purpose to be used. For example, 5 to 100 is preferable, and 10 to 70 is more preferable.
- the number of nucleotide sequences (full length) of the nucleotide chain exceeds 100, non-specific hybridization may occur and detection accuracy may be reduced, and permeability to cell membranes may be reduced, thereby improving the efficiency of living cells. In some cases, it may not be possible to detect the target nucleic acid. If the value is less than 5, the binding force of the hybridization may be insufficient, and the detection accuracy of the target nucleic acid may decrease.
- the nucleic acid probe of the present invention is capable of hybridizing to the target nucleic acid and has a region (site) capable of forming a complementary strand with the target nucleic acid. This allows the nucleic acid probe to capture the target nucleic acid to be detected in the sample.
- the number of regions (sites) that can form a complementary strand with the target nucleic acid is at least one, and may be two or more, but is preferably two.
- the capturing property of the target nucleic acid is excellent, the detection sensitivity can be improved, and the binding force with the target nucleic acid can be improved.
- the position of the region (site) capable of forming a complementary strand with the target nucleic acid is not particularly limited and can be appropriately selected depending on the intended purpose, and may be present in any part of the nucleic acid probe.
- the number of regions (sites) capable of forming a complementary strand with the target nucleic acid is two, both ends of the nucleic acid probe may be used as shown in FIG.
- the complementary portion 3a and the complementary portion 3b) in FIG. 5A and FIG. 5B one end and the center of the nucleic acid probe may be used. Among them, in the latter case (as shown in FIGS.
- the nucleic acid probe undergoes a large shape or structural change before and after hybridization to the target nucleic acid.
- a cleavage active region described later can be formed, and a cleavage activity for a cleavage portion described later can be expressed, so that there is no problem such as erroneous detection in which erroneous cutting is not performed. Is advantageous.
- the length of the complementary strand (region capable of hybridizing to the target nucleic acid),
- the number of one base sequence in the complementary strand can be appropriately selected depending on the particular purpose, and the number of bases is preferably 11 to 13 because the selectivity to the target nucleic acid is high. Preferred 6-9 is particularly preferred.
- the binding force to the target nucleic acid is substantially proportional to the number of base sequences in the complementary strand.
- the binding force of the nucleic acid probe 2 to the target nucleic acid 1 is It is the sum of the binding forces between 3a and the complementary site 3b.
- the binding force of each nucleic acid probe fragment is determined by binding complementarily to the target nucleic acid to form a partial complement site 3a or a complementary site 3b). There will only be a single bond. That is, the cleavage reduces the binding force to the target nucleic acid 1 by almost half.
- a reaction cycle including a process of hybridization to the target nucleic acid 1 and a process of dissociation can be established.
- the V and the complementary nucleic acid can be maintained at around the temperature in the living body (around 37 ° C.) and the target nucleic acid alone.
- it can be easily and spontaneously dissociated, and can be easily introduced directly into a living body or cell to establish a reaction cycle between a nucleic acid probe and a target nucleic acid. If it is 2-10, or even 6-9, the effect is more remarkable, and it is more preferable.
- the number of base sequences in each complementary strand may be the same or different.
- the nucleic acid probe of the present invention preferably has, for example, a cleavage active region (nucleic acid enzyme formation site) 6 capable of forming a site having a cleavage activity of the self-nuclease or the like at the cleavage portion.
- a cleavage active region nucleic acid enzyme formation site 6 capable of forming a site having a cleavage activity of the self-nuclease or the like at the cleavage portion.
- the nucleic acid probe 2 hybridizes to the target nucleic acid 1 and then undergoes a structural change such as formation of a self-nucleic acid enzyme, and then becomes dissociable from the target nucleic acid.
- the cleavage active region can be formed upon hybridization to the target nucleic acid.
- the cleavage active region can be appropriately selected depending on the particular purpose, and is preferably one that expresses cleavage activity under certain conditions.
- the cleavage activity (enzyme activity), such as DNAzyme activity, RN A chain or DNA chain capable of expressing A-zyme activity, ribozyme activity, and the like.
- the cleavage active region includes a region that, when the nucleic acid probe binds to the target nucleic acid, changes conformation so as to form a cavity for capturing a metal ion for expressing an enzyme activity.
- the cleavage active region has a cleavage activity such as an enzymatic activity such as specific cleavage of nucleotides in the nucleic acid probe molecule. Since the nucleic acid probe does not require a restriction enzyme or the like, the target nucleic acid in the cell can be detected by utilizing a specific enzyme reaction only by introducing the nucleic acid probe into the cell.
- an enzyme that recognizes the specific sequence site to be cleaved must be selected and used.
- the nucleic acid probe of the present invention has a specific sequence that is recognized or cleaved by the self nucleic acid enzyme together with the nucleic acid enzyme forming site in the same molecule, it can be freely designed so as to have desired characteristics for the expression of the enzyme activity. Yes, there is no such restriction as when a restriction enzyme is used.
- the cleavage site 12 is preferably located at a position where the cleavage activity is most efficiently exhibited when the self-nuclease 7 is formed after hybridization of the nucleic acid probe.
- the nucleic acid enzyme forming site 6 is preferably in a region between one complementary site 3a and another complementary site 3b.
- the nucleic acid probe is securely fixed to the target nucleic acid, and the self-nuclease 7 is more stabilized. It becomes easier to design to reduce the binding force between the probe and the target nucleic acid.
- the self-nucleic acid enzyme formed from the nucleic acid enzyme-forming site may have any of a cleavage activity, a binding activity and any other activity, but preferably has a cleavage activity.
- the nucleic acid probe is hybridized to the target nucleic acid and then cleaved between two complementary sites by the action of a self-nuclease, each complementary site The fragment that has maintained the binding state with the target nucleic acid by the total binding force of the target nucleic acids, but after cleavage, each fragment that has become short cannot maintain its hybridization with the target nucleic acid and dissociates with the target nucleic acid.
- the free target nucleic acid binds to a new nucleic acid probe, and can repeat a reaction cycle in which formation, cleavage, dissociation, and new hybridization of a self-nucleic acid enzyme are sequentially repeated. Therefore, when a nucleic acid probe designed such that a released fragment emits a signal is used, the signal is amplified on one molecule of the target nucleic acid, and thus the detection sensitivity can be improved.
- Examples of the self-nuclease formed from the nucleic acid enzyme formation site 6 include a DNA enzyme and an RNA enzyme. Any of these nucleic acid enzymes may be a hammerhead type, a hairpin type, an HDV type, or the like. Any other type may be included.
- the nucleic acid probe has a region capable of hybridizing in the molecule when hybridized to the target nucleic acid.
- the target nucleic acid is subjected to hybridization, it becomes easy for the nucleic acid probe to take a three-dimensional confirmation that forms the cleavage active region, and the three-dimensional confirmation.
- the number of regions that can be hybridized to or hybridized to the target nucleic acid in the molecule is not particularly limited, and may be appropriately selected depending on the purpose.
- the force is preferably 2 or more.
- the number of the regions is two or more, it is advantageous in that the formation of the cleavage active region is easy.
- the position of the region that can be hybridized to the target nucleic acid when hybridized to the target nucleic acid is not particularly limited, and is appropriately selected depending on the purpose.
- this position which is preferably located adjacent to each other with the cut portion described later as the center (between), and the center (between) these positions and the cut portion described later.
- the position on the opposite side may be used.
- the cutting active region and the cutting portion can be opposed to each other so that the cutting active region can cut the cutting portion.
- the number of base sequences in a region that can be hybridized or hybridized in the molecule when hybridized to the target nucleic acid is not particularly limited and is appropriately determined according to the purpose. You can choose.
- the number of base sequences of at least one of Y and Z is less than 2, it may be difficult to form or maintain the structure of the cleavage active region.
- the total number of base sequences of Y and Z is not particularly limited, and force 2-12, which can be appropriately selected depending on the purpose, is preferable.
- the nucleic acid probe may not sufficiently contribute to stabilization of the cleavage active region and improvement of the cleavage efficiency, and if it exceeds 12, the nucleic acid probe and the target nucleic acid may be hybridized.
- the nucleic acid Before the hybridization, the nucleic acid has a structure capable of forming the cleavage active region. In this case, when the nucleic acid is hybridized with the target nucleic acid, the free nucleic acid probe can be used.
- the above-mentioned cleavage active region is easily formed, and the nucleic acid probes may cross each other, and may cause hybridization, thereby lowering detection accuracy and sensitivity. Sometimes.
- a loop is usually formed on the nucleic acid probe on the side opposite to the cut portion.
- the number of base sequences in the loop portion is not particularly limited and may be appropriately selected depending on the intended purpose. However, since the reaction rate of the nucleic acid probe usually depends on the loop portion, Is short, and it is preferable because it is more stable! /.
- the nucleic acid probe is divided into the first probe fragment and the second probe fragment.
- the size of the first probe fragment and the size of the second probe fragment are not particularly limited and may be appropriately selected depending on the intended purpose, and may be approximately the same size or different from each other. It is preferable that these have a size that facilitates dissociation of the target nucleic acid.
- a signal e.g., light emission
- cleavage of the cleavage portion by the cleavage active region can be generated in a short time, which is advantageous in that high-speed detection can be performed.
- the cleavage active region When the cleavage active region has DNA zym activity, RNA zym activity, ribozyme activity or the like with respect to the cleavage portion, the cleavage active region usually has an active center site, When the metal ion is present at the active center site, the DNA zym activity, the RNA zym activity, the ribozyme activity, and the like can occur.
- the metal ion is not particularly limited and may be appropriately selected depending on the purpose. Examples thereof include a magnesium ion and a cobalt ion. Of these, a magnesium ion is preferable.
- the metal ion In order to cause the metal ion to be present at the active center site, for example, a method in which the nucleic acid probe is present in a solution containing the metal ion may be used.
- the concentration of the metal ion in the solution can be appropriately selected depending on the purpose without particular limitation. For example, 10 to 50 mM is preferable.
- the method for designing the cleavage active region can be appropriately selected depending on the purpose without particular limitation.
- the cleavage active region is formed by a nucleic acid chain such as DNA
- the method described above is used.
- the SELEX method is preferably used.
- a plurality of nucleic acids are allowed to act on a target (here, the cleavage portion), a nucleic acid having a strong binding force is selectively separated from the plurality of nucleic acids, amplified, and further subjected to a plurality of nucleic acids.
- a nucleic acid sequence having high affinity for the target (the cleavage portion) is selected.
- the cleavage portion is formed when the nucleic acid probe hybridizes to the target nucleic acid.
- the shape, structure, size, material, etc. of the unwrapping can be appropriately selected according to the purpose, as long as it can be specifically cleaved (can be cut by the cleavage active region).
- the cleavage portion can be appropriately selected according to the type of the cleavage active region.
- the cleavage active region has the DNA zym activity
- the cleavage activity is preferably DNA.
- the region has the RNAzyme activity, it is preferably RNA.
- the region has RNA cleavage activity, it is preferably ribose.
- the cleavage portion is cleaved by the cleavage active region, but the cleavage active region is designed to be formed when the nucleic acid probe is hybridized to the target nucleic acid. Is advantageous only in that it is cleaved only when the nucleic acid probe has hybridized to the target nucleic acid, thereby preventing erroneous detection of the target nucleic acid.
- nucleic acid probe of the present invention hybridizes to the target nucleic acid, it is preferable that a part of the molecule hybridizes with each other in the molecule to form a lock structure.
- the cleavage active region is not formed while the nucleic acid probe has the lock structure, that is, until the nucleic acid probe contacts the target nucleic acid.
- the cleavage active region is formed only when the nucleic acid probe no longer has the intramolecular hybridization structure, that is, when the nucleic acid probe hybridizes to the target nucleic acid. Therefore, the hybridization of the nucleic acid probe to the target nucleic acid and the structural change typified by cleavage of the cleavage portion can be completely linked, and erroneous detection and the like can be effectively performed. This is advantageous in that it can be prevented.
- the lock structure can be appropriately selected depending on the purpose, and examples thereof include a stem loop structure and a hairpin structure. These may be formed alone in the nucleic acid probe, or may be formed in the nucleic acid probe in combination of two or more. Among these, the stem-loop structure is preferred. Generally means a three-dimensional hairpin structure formed by a nucleic acid, and usually has a stem portion having a stem-like shape by complementary bonding and a loop portion having a loop-like shape.
- the number of base sequences in one of the complementary strands (parts that are hybridized to each other, for example, the stem part) forming the hybridization is as follows. , 4 to 8 nt is preferred.
- the binding strength of the complementary strand in the hybridization region may be weak and insufficient, which may cause erroneous detection and the like.
- the length exceeds 8 nt, the binding strength of the complementary strand in the hybridization region (for example, the stem) becomes too strong, and the nucleic acid probe can hybridize to the target nucleic acid. Or it may be difficult to hybridize.
- the signal generating portion in the nucleic acid probe of the present invention is not particularly limited as long as it can generate a signal when the nucleic acid probe is hybridized to the target nucleic acid, and is appropriately selected according to the purpose.
- a light-emitting portion capable of emitting light when the nucleic acid probe is subjected to hybridization with the target nucleic acid a light-emitting portion that emits light, and a light-emitting portion positioned adjacent to the light-emitting portion.
- a combination with a quenching unit for quenching the light emission of the light emitting unit is preferably exemplified.
- the signal generator can be used not only to detect the presence or absence of signal generation but also as a dynamic parameter for tracking the behavior of the target nucleic acid in cells.
- nucleic acid probe may be provided alone in the nucleic acid probe, or may be provided in combination of two or more. Among them, a combination of the light emitting section and the quenching section is preferable. .
- the signal is not particularly limited and can be appropriately selected depending on the intended purpose.
- Examples of the signal include light emission, quenching, protein expression, radiation emission, temperature change (heat generation, etc.), magnetic force change (magnetic generation, etc.), Cutting fragment generation, substance production, substance consumption, deformation, viscosity change, color change, UV absorption, pH change, optical rotation, isomerization, etc. These may be used alone or Or two or more of them may be used in combination.
- the method or means for detecting the signal can be appropriately selected according to the purpose of the present invention without particular limitation.
- a light receiving device a camera, or the like is used.
- a photosensitive film or the like can be mentioned; in the case of temperature change, a thermocouple or a temperature sensor can be mentioned; in the case of a magnetic force change, a magnetic sensor or the like can be mentioned.
- a viscosity sensor may be mentioned, in the case of substance production, antibodies, HPLC, affinity chromatography, etc., and in the case of substance consumption, IR Spectrum, MS spectrum, etc., in the case of deformation, an electron microscope, and in the case of viscosity change, a viscosity sensor.
- the alignment of the light emitting section and the quenching section can be appropriately selected depending on the purpose without particular limitation.
- fluorescence resonance energy (FRET) and the like can be selected. What is known as the technique can be suitably adopted.
- the light-emitting portion can be appropriately selected depending on the purpose of being not particularly limited as long as it can emit light, and includes, for example, a fluorescent material, a chemiluminescent material, an electrochemical luminescent material, and the like. Or those formed of these.
- the quenching portion when the quenching portion is present adjacent to the light emitting portion, the quenching portion is preferably quenched by the action of the quenching portion, which is excellent in visibility and easy to detect. Fluorescent substances are more preferable.
- the fluorescent substance can be appropriately selected depending on the purpose without particular limitation.
- rhodamines such as anthracene, fluorescein, fluorescein isothiocyanate (FITC), tetramethylrhodamine and sulforhodamine , Dansilk Ride, Texas Red, AL350, Indian Carbocyanine (CY), and the like.
- the nucleic acid probe has the light-emitting portion in that the detection can be performed visually or the like.
- the extinction unit is appropriately selected according to the type of the light-emitting unit, which is not particularly limited as long as light emission of the light-emitting unit can be extinguished when positioned adjacent to the light-emitting unit. Examples thereof include those containing a quenching substance, those formed with the quenching substance, and the like.
- the quenching substance is not particularly limited and may be appropriately selected depending on the intended purpose.
- the energy emitted by the fluorescent substance when emitting light is emitted.
- a substance capable of absorbing light and a substance capable of optical resonance transfer (fluorescence resource energy transfer: FRET) between the light-emitting substance and the like.
- FRET fluorescent resource energy transfer
- TRITC Tetramethylrhodamine isothiocyanate
- DBSYL dimethylaminobenzenesulfur
- gold nanoparticles black hole quencher, and the like.
- the nucleic acid probe has the quenching part
- the nucleic acid probe before the nucleic acid probe hybridizes to the target nucleic acid, that is, when the quenching part is present adjacent to the light emitting part, The luminescence of the light-emitting portion can be quenched, while after the nucleic acid probe has been subjected to the hybridization with the target nucleic acid, the cleavage portion is cleaved, and the first probe fragment and the first probe fragment are cleaved.
- the quenching part is located away from the light emitting part
- the function of the quenching part is lost and the light emission is prevented. Since light emission can be generated in the light-emitting portion, the presence of the target nucleic acid is advantageous in that the light-emitting portion can easily detect the presence of the target nucleic acid visually or the like.
- the position of the quenching portion in the nucleic acid probe may be appropriately selected depending on the intended purpose, but may be selected before the nucleic acid probe hybridizes to the target nucleic acid. Is located adjacent to the light-emitting portion, and when the nucleic acid probe has been subjected to hybridization with the target nucleic acid, that is, the cleavage portion is cut and the nucleic acid probe is replaced with the first probe. After being divided into the fragment and the second probe fragment, it is preferable that the fragment is located apart from the light emitting unit. Specifically, when the light emitting unit is present in the first probe fragment, Is more preferably present in the second probe fragment. Conversely, the light emission is present in the second probe fragment.
- the quenching portion and the light emitting portion are located with the cutting portion therebetween. In this case, when the cutting portion is cut, the quenching portion is advantageously present in another probe fragment different from the light emitting portion.
- the distance between the light-extinguishing section and the light-emitting section until the cutting section is cut is not particularly limited as long as the light-extinguishing action of the light-extinguishing section works.
- the number of bases present between the terminal base on the light emitting portion side in the quenching portion and the terminal base on the light emitting portion side in the light emitting portion is preferably 5 to 30 nt.
- the quenching effect of the quenching portion is sufficient. May not be minutes.
- the specific combination of the luminescent substance and the erasing substance is not particularly limited, and can be appropriately selected depending on the purpose.
- fluorescein isothiocyanate Suitable examples include a combination of (FITC) with tetramethylrhodamine isothiocyanate (TRITC), a combination of dimethylaminobenzenesulfol (DABSYL) and fluorescein, and the like.
- the light-emitting portion is designed to emit light when the nucleic acid probe hybridizes to the target nucleic acid.
- the present invention is not limited to these cases, and the light emitting portion emits light before the nucleic acid probe hybridizes to the target nucleic acid, and the nucleic acid probe hybridizes to the target nucleic acid.
- it may be designed so that the light emission of the light emitting unit is extinguished.
- the nucleic acid probe of the present invention may be designed so as not to have the labeling substance (such as the light emitting part and the quenching part), and the nucleic acid probe may be hybridized to the target nucleic acid.
- the detection can be performed by, for example, electrophoresis of a probe fragment generated by the cleavage by the hybridization or the hybridization.
- the fluorescent substance F and the quencher Q are located at the cleavage site 12 by the self-nuclease. It is preferable that they are provided at interposed positions.
- the principle is fluorescence resonance energy transfer (FRET).
- FRET fluorescence resonance energy transfer
- the distance between the fluorescent substance (F) and the quenching substance (Q) is particularly important, but in a state where the nucleic acid probe 2 of the present invention has hybridized to the target nucleic acid 1, The distance between F and Q is designed such that FRET is established and quenched.
- each fragment cannot dissociate with the target nucleic acid and is dissociated.
- the fluorescent substance released from FRET emits fluorescent light. In this way, the target nucleic acid can be detected or quantified from the fluorescence intensity enhancement tl.
- the target nucleic acid can be detected without separating the hybridized nucleic acid probe from the non-hybridized nucleic acid probe, and the procedure is simplified, which is preferable.
- the fluorescent substance and the quencher are preferably separated from each other by a distance of about 5 to 30 base sequences across the cleavage site in a state of being hybridized to the target nucleic acid, but are not necessarily limited to this case.
- FITCZTRITC energy donating substance and an energy accepting substance
- the nucleic acid probe of the present invention can be used as a form immobilized on the surface of a carrier such as a glass substrate, so-called “DNA chip”, and is more likely to be used as a Lab-on-Chip.
- the other parts can be appropriately selected as long as the effects of the present invention are not particularly limited, and examples thereof include various markers, a water-soluble linker, and the like.
- the various markers can be appropriately selected depending on the particular purpose, and examples thereof include a radiation label, a quantum dot label, and a protein label.
- the nucleic acid probe When the nucleic acid probe is used by being fixed to a carrier, it is preferable to introduce the water-soluble linker between the nucleic acid probe and the carrier.
- the carrier is not particularly limited and can be appropriately selected depending on the purpose. , Resin particles and plates, bottom and side surfaces of containers, and the like.
- the water-soluble linker is not particularly limited and may be appropriately selected depending on the purpose.
- an ethylene glycol linker can be used.
- the length of the water-soluble linker may be determined appropriately according to the structure and type of the carrier.
- nucleic acid probe When the nucleic acid probe is introduced into cells and used, a part or all of the nucleic acid in the nucleic acid probe is subjected to 2′-OMe treatment (the hydroxyl group at the 2′-position of the sugar is converted to methoxy). (Substitution with a group). Thus, non-specific cleavage of the nucleic acid probe by an endogenous cell enzyme can be suppressed, and the detection accuracy of the target nucleic acid can be improved.
- 2′-OMe treatment the hydroxyl group at the 2′-position of the sugar is converted to methoxy.
- the nucleic acid probe of the present invention can be detected even when the target nucleic acid such as a virus, a bacterium, an animal cell, or a plant cell is contained in an extremely small amount, and is used for gene therapy, testing for the presence of food poisoning bacteria, diagnosis of caries or periodontal disease, It can be suitably applied to blood tests and the like, and is suitable for the nucleic acid chip, target nucleic acid detection method, drug screening method, gene detection device, and gene diagnosis method of the present invention described below.
- the nucleic acid probe of the present invention can be used for, for example, blood tests (prevention of viral infection during blood transfusion), sanitary control of blood products such as whole blood, albumin products, blood coagulation products, virus tests at the time of fertilization of the population, sexually transmitted diseases,
- the present invention can be suitably applied or applied to the analysis of pathological conditions of neurological diseases, and the like.
- the nucleic acid probe of the present invention is added to the collected saliva, for example, as an HIV infection test or a diagnosis of caries or periodontal disease.
- the positive and negative tests can be performed simply and easily by visual inspection or the like.
- nucleic acid probe of the present invention can be suitably applied to fields such as criminal search, forensic medicine, and archeology.
- the nucleic acid probe When the target nucleic acid is detected using the nucleic acid probe of the present invention, the nucleic acid probe may be used alone or in the presence of a helper oligonucleotide (helper oligonucleotide). May be used with oligonucleotides).
- helper oligonucleotide helper oligonucleotide
- the helper oligonucleotide is not particularly limited as long as it has a function of assisting the nucleic acid probe to hybridize to the target nucleic acid. A known neutral force depending on the purpose. Those having a function of assisting in changing the loop structure into a linear structure are preferred.
- the helper oligonucleotide can be used particularly preferably in combination with the nucleic acid probe when the nucleic acid probe has the lock structure.
- the length of the helper oligonucleotide that is, the number of base sequences, is not particularly limited.
- the target nucleic acid to be detected by the nucleic acid probe of the present invention is not particularly limited, and can be appropriately selected depending on the purpose, and may be purified or unpurified RNA, DNA, Any of PNA and artificially decorated nucleic acid may be used.
- the method for determining the base sequence of the target nucleic acid is not particularly limited and can be appropriately selected depending on the purpose. Examples thereof include the Maxam-Gilbert method and the dideoxy method.
- the sample in which the target nucleic acid is present is not particularly limited and can be appropriately selected depending on the purpose.
- examples include blood, serum, plasma, feces, urine, sputum, bone marrow fluid, sweat, tears, saliva, semen, It may be collected or prepared from water such as tap water, pre-treated water, or cells (including living cells) or viruses.
- the cell is not particularly limited and may be appropriately selected depending on the purpose. Examples thereof include animal cells, plant cells, fungi, and yeast.
- the animal cells are not particularly limited and can be appropriately selected depending on the purpose. Examples thereof include embryonic stem cells such as fertilized eggs, ES cells, EG cells, and EC cells, embryonic cancer cells, and hematopoietic stem cells. And cancer cells which have become cancerous and have become immortalized, cell lines of various organs, erythrocytes, lymphocytes, leukocytes and the like.
- the animal cells include cells of a transgenic animal transformed from the time of development.
- the living body from which the animal cells are derived for example, mammals, reptiles, birds, Any of live fish, fish, insects, etc. may be used.
- Examples of the mammal include carnivores, primates, herbivores, rodents, and the like. Specific examples include mice, rats, genotypes, musters, pests, pomas, pigs, and the like. Goats, wild boars, elephants, kirins, pandas, dogs, cats, bears, egrets, whales, irca, monkeys, humans and the like.
- the reptiles include, for example, turtles, snakes, cynopodes, reptiles, squamata, etc.Specifically, tortoises, turtles, green turtles, turtles, lizards, iguanas, Chameleon, gecko, -Shiki snake, Nami snake, Cobra.
- the birds include, for example, ducks, geese, albatross, -birds, ibises, power gulls, locusts, shore ostriches, sparrows, crows, pheasants, crocodile, mynah, yambarutaina, stork, cranes, photoglyphs, woodpeckers, owls, owls Gancho, Mizuzura, Ommu etc. are mentioned.
- amphibians examples include potatoes, newts, salamanders, salamanders and the like.
- Examples of the fish include freshwater fish and saltwater fish, and specific examples of the freshwater fish include arowana, guppy, catfish, tanago, koi, medaka, tamame, char, piranha, nodigiyo, cichlid, catfish and the like.
- Specific examples of the saltwater fish include rays, sharks, clownfish, kisses, goby, tuna, flounder, sunfish, manta rays, clownfish, angelfish, and discus.
- insects examples include power beetles, stag beetles, dragonflies, bees, crickets, squashes, power beetles, ari, cockroaches, power creatures, cicada, tagame, flies, notta, fireflies, and butterflies.
- the plant cells are not particularly limited and can be appropriately selected depending on the purpose. Examples thereof include cells derived from parts such as flowers, stems, roots, and leaves, and even those protoplasts. Good.
- the type of the plant is not particularly limited and can be appropriately selected depending on the purpose. Examples thereof include cells derived from seed plants, ferns, bryophytes, algae, and the like. Also included are transgenic plants into which the polynucleotide has been introduced.
- Examples of the seed plants include gymnosperms, angiosperms, and the like. Specific examples include rice, wheat, barley, cherry, dandelion, pine, tulip, sunflower, cedar, beech, and eggplant. Lotus, oilseed rape, nadesico, faba bean, camellia, seri, corn, green onion, cromo, taro, twigweed, Ichiyou, cycad, cypress, cypress, larch, Ibuki, chrysanthemum, perilla, gentian, saccharo, orchid, lily, iris, etc. No.
- Examples of the fern plant include radish, peravi, horsetail, spring, hego, oak, lycopodium, horsetail, and the like.
- bryophytes examples include Sugigoke, Sphagnum, Kurogoke, Hikarigoke, Chochinoke, Tachigoke, Zenigoke, Jagoke, Perokogoke, Notakegoke, Kochigoke, Pakigoke and the like.
- Examples of the algae include Chlamydomonas, Aonori, Chlorella, Amidro, Mill, Aosa, and Marimo.
- the fungi are not particularly limited and can be appropriately selected depending on the purpose.
- mushrooms examples include shiitake, matsutake, agaritasake, eryngii, maitake, yamabushitake, bunashimeji, tamogitake, nameko, oyster mushroom, shrimp mushroom, enoki mushroom and the like.
- the fungi can be broadly classified into yeast and filamentous fungi.
- yeast examples include Candida albicans. C. glabrada. C. tropicalis, parapsilosis. C. stellatoidea. Crvptococcus neoformans. Saccha romvces cerevisiae, and the filamentous fungi include, for example, Trichophvtin ruprum. , Microsporum canis, Alternaria alternata, Alternaria pana x, Bipolaris brizae.
- bacteria examples include gram-positive bacteria and gram-negative bacteria, and may be any of anaerobic bacteria, facultative anaerobic bacteria, microaerobic bacteria, and aerobic bacteria.
- Specific species of the bacterium include, for example, Staphylococcus aureus.Streptococcus ⁇ vogenes.Rnterococcus faecalis.Bucillus anthracis. tuberculosis, Corvnebacterium glutamicum ⁇ StreDtomyces antibioticus. Salmonella typhi, Edwardsiella tarda, Citrobacter freun dii, Vibrio parahaemolvticus. Morganella morganii.
- bacteria for example, periodontal disease-causing bacteria, cariogenic bacteria, food poisoning bacteria, and the like are also preferably mentioned.
- microorganisms include protists, plankton, and the like.
- protozoa examples include dysentery amoeba, large intestine amoeba, Trichomonas vaginalis, Torino V soma, malaria, Pneumocystis cari, Cryptomonas, Euglena, filamentous worm, whipworm and the like.
- the plankton includes, for example, daphnia, daphnia and pest.
- the virus is not particularly limited and can be appropriately selected depending on the purpose. Examples thereof include a retrovirus, an adenovirus, a herpes virus, a Sendai virus, and a Bataterio phage.
- retrovirus examples include mouse leukemia virus, human immunodeficiency virus, human T lymphocyte tropic virus, and the like.
- adenovirus examples include canine adenovirus type 1, canine adenovirus type 2, human adenovirus type 1, human adenovirus type 2, and the like.
- Sendai virus examples include, for example, those mainly derived from mice, and it is known that humans are not infected.
- Examples of the Batatelio phage include T4 phage, T5 phage, T7 phage, ⁇ phage, M13 and the like.
- plasmids and cosmids in Escherichia coli are also included.
- examples of such plasmids include pBR322, pBR325, pAT153, pUC8, pUC18, pUC19, and pSP-RLUC. I can get lost.
- the nucleic acid chip of the present invention is not particularly limited except that the nucleic acid probe of the present invention is immobilized on a carrier.
- a known configuration can be appropriately adopted according to the purpose. Among them, a configuration in which the nucleic acid probe is fixed to the carrier via the water-soluble linker is preferable.
- a known carrier and the like are preferably exemplified.
- the nucleic acid chip having the nucleic acid probe immobilized on the carrier can be suitably used as a DNA chip.
- the carrier is not particularly limited and can be appropriately selected depending on the purpose.
- It may be formed of an inorganic material or an organic material.
- Examples of the inorganic material include inorganic polymers, metals, ceramics, semiconductors, magnets, paramagnets, and apatite.
- Preferred examples of the inorganic polymer include carbon, amorphous carbon obtained by carbonizing a thermosetting resin, and graphite.
- Preferred examples of the metal include gold, platinum, silver, copper, iron, and aluminum.
- Preferred examples of the ceramic include alumina, silica, silicon nitride, silicon carbide, glass, quartz, silica gel, and the like.
- Silicon is preferably used as the semiconductor.
- One of these inorganic materials may be used alone, or two or more thereof may be used in combination.
- organic material examples include plastics and natural polymers.
- plastic examples include polyethylene, polystyrene, polycarbonate, polypropylene, polyamide, phenol resin, epoxy resin, polycarboimide resin, polyvinyl chloride, polyvinylidene fluoride, polyethylene fluoride, polyimide, and acrylic resin. Fats and ceramics.
- the shape of the carrier is usually the same as the shape of the nucleic acid chip, and thus can be selected from the viewpoint of how to design the nucleic acid chip.
- the various molded products include, for example, strips, wells or strips of multi-well plates, tubes, meshes, continuous foams, membranes, paper, needles, fibers, plates, hollow fibers, slides, cell containers, etc. Is mentioned.
- the size of the nucleic acid chip is not particularly limited, and can be appropriately selected depending on the purpose.
- the arrangement of the nucleic acid probes on the nucleic acid chip can be appropriately selected depending on the intended purpose without limitation. For example, it may be the entire surface or a partial surface of the carrier. Alternatively, they may be arranged in an array on the surface of the carrier.
- the type of the nucleic acid probe to be arranged on the nucleic acid chip is not particularly limited and can be appropriately selected depending on the purpose.
- One type may be used alone, or two or more types may be used. .
- by arranging each nucleic acid probe in an array it is possible to simultaneously qualitatively and quantify a large number of genes and a large number of genes, which is suitable for gene diagnosis and the like.
- the color of the emitted light is designed to be different for each type of the nucleic acid probe (designed as a multi-color probe)
- the target nucleic acid can be determined simply by visually observing the emitted color. This is advantageous in that the presence or absence of a can be determined instantaneously.
- the nucleic acid chip of the present invention can be suitably used for the detection or analysis of the target nucleic acid, and is suitably used for the target nucleic acid detection method, drug screening method, gene diagnosis method and the like of the present invention described below. be able to.
- the nucleic acid chip of the present invention can be detected even if the target nucleic acid such as a virus, a bacterium, an animal cell, or a plant cell is extremely small, and can be suitably applied to gene therapy or the like. It is suitable for a nucleic acid detection method, a drug screening method, a gene detection device, and a gene diagnosis method. [0095] Further, the nucleic acid chip of the present invention can be used, for example, for blood tests (prevention of viral infection during blood transfusion), sanitary control of blood products such as whole blood, MAP, FFP, albumin products and blood coagulation products, at the time of population fertilization, etc.
- blood tests prevention of viral infection during blood transfusion
- sanitary control of blood products such as whole blood, MAP, FFP, albumin products and blood coagulation products
- nucleic acid chip of the present invention can be used in the collected saliva to perform a positive or negative test.
- the nucleic acid chip of the present invention can be easily and easily visually inspected, and can be suitably applied to fields such as criminal search, forensic medicine, and archeology.
- the target detection method of the present invention includes the following first to third target detection methods.
- the first method for detecting a target nucleic acid is a method for detecting a target nucleic acid using a nucleic acid probe, wherein the nucleic acid probe undergoes a structural change after hybridization to the target nucleic acid,
- the altered nucleic acid probe is designed to reduce the binding force of the hybridization and dissociate the target nucleic acid.
- the second method for detecting a target nucleic acid uses a nucleic acid probe having a complementary site having a sequence complementary to at least a part of the base sequence of the target nucleic acid, and a nucleic acid enzyme-forming site capable of forming a self-nuclease.
- a method for detecting a target nucleic acid comprising: a hybridization step of complementarily binding the nucleic acid probe to a target nucleic acid; and after forming the hybridization, the self-nucleic acid enzyme is formed.
- the structure of the probe is changed, and as a result, the binding force of the hybridization is reduced, and the nucleic acid probe is dissociated from the target nucleic acid, and at least a part of the nucleic acid probe dissociated in the dissociation step. And a detecting step of detecting.
- the third method for detecting a target nucleic acid includes a step of hybridizing the nucleic acid probe of the present invention to a target nucleic acid, an hybridization step, and a step of hybridizing the nucleic acid probe with the target nucleic acid when the nucleic acid probe is hybridized to the target nucleic acid.
- the target detection method of the present invention basically, only an operation of causing the nucleic acid probe to hybridize to the target nucleic acid present in the sample, and thereafter, spontaneously changes in the structure of the nucleic acid probe and hybridization. A decrease in the binding force, dissociation of the nucleic acid probe, accumulation of the signal, and the like occur, and the measurement of the target nucleic acid becomes possible. Since the operation is very simple in this way, complicated or special devices or special reagents are not required, and a genetic diagnosis can be performed quickly when necessary, for example, in a clinic, home, school, workplace, or the like. be able to.
- the method for introducing the nucleic acid probe into the cell can be appropriately selected depending on the type of the cell to which the nucleic acid probe is not particularly limited. For example, known methods such as a calcium phosphate method, a liposome method, an electoral poration method, and a sonoporation method can be used. A gene transfer method can be used.
- nucleic acid detection method of the present invention it is preferable to use a nucleic acid probe having a labeling substance that emits a different signal before and after the nucleic acid probe dissociates with the target nucleic acid.
- a phenomenon such as hybridization or dissociation between the nucleic acid probe and the target nucleic acid can be easily recognized as a signal change, and the target nucleic acid can be more easily detected.
- the nucleic acid detection method of the present invention provides a nucleic acid having a complementary site having a sequence complementary to at least a part of the base sequence of a target nucleic acid, and a nucleic acid enzyme-forming site capable of forming a self-nuclease.
- a method for detecting a target nucleic acid using a probe comprising: a hybridization forming step of complementarily binding the nucleic acid probe to the target nucleic acid; and after the hybridization, the self-nucleic acid enzyme is used.
- the structure of the nucleic acid probe thus formed changes, and as a result, the binding force of the hybridization decreases, and the nucleic acid probe dissociates from the target nucleic acid; and the nucleic acid dissociated in the dissociation step. And a detecting step of detecting at least a part of the probe.
- the labeling substance on the nucleic acid probe that has been hybridized once with the target nucleic acid can be positively detected. Can be used to detect the target nucleic acid.
- the hybridization with the target nucleic acid is performed only at the complementary site of the nucleic acid probe, the time required for completing the hybridization can be shortened, and the test can be performed quickly. be able to.
- the restriction enzyme used in the conventional method does not need to amplify the sample DNA (RNA) by PCR or the like.
- the reaction proceeds at a constant temperature without the need for a restriction enzyme site in the nucleic acid probe and without the need for additional chemical substances. Can be used.
- the step of hybridization is a step of hybridizing the nucleic acid probe of the present invention to the above-mentioned target nucleic acid.
- the conditions for the above-mentioned and the hybridization can be appropriately selected according to the purpose to which there is no particular limitation.V, so-called ⁇ stringent '' hybridization is performed under the conditions.
- Preferable pH is 7.0-8.5, and temperature is preferably 30 ° C--60 ° C. 0.01-1. In a solution with sodium ion salt concentration less than 1M It is preferable to do it.
- helper oligonucleotide may be used in combination.
- the helper oligonucleotide is not particularly limited as long as it has a function of assisting the nucleic acid probe to hybridize to the target nucleic acid.
- a known neutral force can be appropriately selected depending on the purpose. Force A thing having a function of assisting in changing the lock structure (stem-loop structure) to a linear structure is preferable.
- the helper oligonucleotide can be used particularly preferably in combination with the nucleic acid probe when the nucleic acid probe has the lock structure.
- the target nucleic acid detection step comprises detecting the signal generated when the nucleic acid probe of the present invention hybridizes to the target nucleic acid, thereby detecting the target nucleic acid. This is the step of detecting.
- the signal is as described above, for example, emission, quenching, radiation emission, temperature change (heat generation, etc.), magnetic force change (magnetism generation, etc.), cut piece generation, substance production, substance consumption, deformation, viscosity change , And the like. These may be used alone or in combination of two or more.
- the method or means for detecting the signal can be appropriately selected depending on the purpose, without particular limitation.
- a light-receiving device a camera, or the like can be used.
- a photosensitive film can be used.
- a thermocouple or temperature sensor can be used.
- a magnetic sensor can be used.
- electrophoresis SDS-PAGE, and ester blotting.
- substance production include antibodies, HPLC, and affinity chromatography, and examples of substance consumption include IR spectra.
- an electron microscope is used, and in the case of a change in viscosity, a viscosity sensor is used.
- the target In the nucleic acid detection step, the presence of the target nucleic acid is detected by detecting the luminescence.
- a method for detecting the light emission of the light emitting unit can be appropriately selected depending on the purpose without particular limitation.
- the light emitting unit is formed of the light emitting substance, Is a fluorescent substance, the luminescence (fluorescence) thereof can be easily detected visually or by a fluorescence microscope, and when the luminescent substance is formed of the chemiluminescent substance, a photosensitive film or the like can be used.
- digital analysis can be performed by using a CCD camera. In this case, digital processing can be performed. This is advantageous in that it is easy and qualitative and quantitative determination of the target nucleic acid can be performed with high accuracy.
- the target nucleic acid detection method of the present invention can detect even a very small amount of the target nucleic acid, such as a virus, a bacterium, an animal cell, or a plant cell, and can detect gene therapy, the presence of food poisoning bacteria, caries or teeth. It can be suitably applied to diagnosis of periodontal disease, blood test and the like.
- the method for detecting a target nucleic acid of the present invention can be used, for example, for blood tests (prevention of viral infection during blood transfusion), whole blood, MAP, FFP, albumin preparations, blood coagulation preparations, etc.
- the present invention can be suitably applied or applied to a virus test, a sexually transmitted disease test, a pathological analysis of neurological diseases, and the like. Further, the target nucleic acid detection method of the present invention can be suitably applied to fields such as criminal search, forensic medicine, and archeology.
- target nucleic acid 1 and nucleic acid probe 2 of the present invention are hybridized (A in FIG. 1).
- the reaction conditions can be appropriately set and can be carried out by a known method.
- the reaction is carried out under V, so-called "stringent" hybridization conditions.
- it is carried out using a solution having a magnesium ion salt concentration of about 0.01 to 0.1 M at ⁇ 7.0 to 8.5 and a temperature of 30 to 60 ° C.
- the target nucleic acid is usually denatured into a single strand in advance by high-temperature treatment or the like.
- the hybridized nucleic acid probe forms an autologous nucleic acid enzyme 7 under certain conditions (A in FIG. 1). Recognition of a specific sequence and expression of enzyme activity occur in the nucleic acid probe 1 by the self-nucleic acid enzyme 7.
- the self-nucleic acid enzyme 7 has a cleavage activity, a nucleotide is cleaved at a cleavage site 12 having a specific sequence (B in FIG. 1).
- the nucleic acid probe 2 thus cleaved cannot maintain the binding state with the target nucleic acid 1 and is dissociated (C in FIG. 1).
- the fluorescent substance F on the nucleic acid probe fragment is not affected by the quencher Q and emits a fluorescent signal. This signal is detected or analyzed in the next detection step.
- the nucleic acid probe 2 when the target nucleic acid 1 is present, the nucleic acid probe 2 is capable of hybridizing to the target nucleic acid 1. Since the base sequences 3a and 3b are present at both ends (see FIGS. 2 and 3), when the base sequences 3a and 3b hybridize to the nucleic acid sequence 1 (A in FIG. 1), the nucleic acid enzyme The cleavage active region 7 is formed by the three-dimensional confirmation of the element formation site 6, and the cleavage activity (ribozyme activity) for the cleavage portion 12 is generated, and the cleavage portion 12 (ribose portion) is cleaved (self).
- the first probe fragment having the luminescent substance F and the quencher Q (B in FIG. 1), and each is dissociated from the target nucleic acid 1.
- the luminescent substance F and the quencher Q which were located adjacent to each other, are located apart from each other. (C in Fig. 1).
- the emission of the luminescent substance F causes the emission of the quenching substance Q to occur due to the transfer of fluorescence resonance energy (FRET) between the two.
- FRET fluorescence resonance energy
- the quenching state 8 causes the fluorescence resonance energy transfer to cease, the quenching action of the quenching substance Q to stop working, and the luminescent substance F to emit light (C in FIG. 1).
- This luminescence is generated each time the nucleic acid probe hybridizes to the target nucleic acid 1, and this reaction is repeated (catalytic process, cycle A to C in FIG. 1) and amplified. That is, when the nucleic acid probe 2 is cleaved, the first probe fragment and the second probe fragment cannot maintain the hybridization, and when dissociated from the target nucleic acid 1, Since 1 is in a free state, a new nucleic acid probe 2 hybridizes, and the cycle of AC in FIG. 1 is repeated.
- the nucleic acid probe 2 can use the target nucleic acid 1 as an arosteric effector. For this reason, even when the target nucleic acid 1 has an extremely small amount ( ⁇ 1 or short life), the luminescence generated by the nucleic acid probe can be increased.
- the target nucleic acid detection step light emission by the luminescent substance F is detected.
- This detection can be performed by appropriately selecting according to the properties of the nucleic acid probe and the labeling substance. For example, when the nucleic acid probe is labeled with a fluorescent substance, it is performed using a fluorescence microscope or the like. If labeled with a radioisotope, it can be performed by autoradiography.If labeled with a chemiluminescent substance, analysis using a photosensitive film or digital analysis using a CCD camera can be performed. Analysis can be performed, and as a result, qualitative and quantitative analysis of the target nucleic acid can be performed.
- the target nucleic acid can be detected by, for example, confirming the cleaved nucleic acid probe fragment by gel electrophoresis or the like.
- the nucleic acid probe is preferably cleaved in the nucleic acid enzyme reaction step.
- the activity of the self-nucleic acid enzyme is not particularly limited, but the nucleic acid probe is preferably cleaved by the expression of the cleaving activity.
- Each fragment resulting from the cleavage of the nucleic acid probe cannot maintain its hybridization with the target nucleic acid, dissociates with the target nucleic acid, and then a new nucleic acid probe binds to the target nucleic acid. As a result, a reaction cycle enabling such signal amplification can be easily formed.
- the nucleic acid probe is preferably fixed to a carrier.
- a device for nucleic acid analysis such as a DNA chip and a DNA microarray can be configured, and a large amount of gene data can be obtained with high sensitivity.
- the device for nucleic acid analysis using the nucleic acid probe of the present invention for example, at every lapse of time after the administration of the drug, the mRNA of the cell or organ was also extracted, and the nucleic acid probe of the present invention was immobilized.
- An increase in mRNA level means that genetic information from DNA molecules is actively transcribed, which corresponds to an increase in gene function.
- information on the gene pathway can be obtained.
- nucleic acid detection device in which two or more nucleic acid probes of the present invention having different base sequences are immobilized on the same carrier, multiple types of target nucleic acids can be detected or measured at once.
- the nucleic acid probe has two base sequences complementary to each other at both ends thereof, which are capable of ribonucleation and elimination (see FIGS. 5A and 5A).
- the cleavage active region is formed, and the cleavage activity (ribozyme activity) for the cleavage site is formed.
- the magnesium ion is located at the center of the cleavage active region, and the cleavage activity is further improved.
- the cleavage portion (ribose portion) is cleaved (self-cleaved) and divided into a first probe fragment having the luminescent substance F and a second probe fragment having the quenching substance Q (D in FIG. 6). Each is dissociated from the target nucleic acid. Note that the luminescent substance F and the quenching substance Q, which were located adjacent to each other, would be located away from each other when the nucleic acid probe hybridized to the target nucleic acid (see FIG. 6).
- the quenching effect of the quenching substance Q is lost, and the luminescent substance F emits light.
- the luminescence of the luminescent substance F and the cleavage of the cleavage portion by the hybridization of the nucleic acid probe to the target nucleic acid are performed substantially simultaneously.
- the luminescence by the luminescent substance F occurs each time the nucleic acid probe hybridizes to the target nucleic acid, and this reaction is repeated (AD cycle in FIG. 6) and amplified.
- the nucleic acid probe can use the target nucleic acid as an aosteric effector. Therefore, even if the target nucleic acid has a very small amount (100 ng Z1) or a short lifetime, its presence can be easily detected visually or the like by amplifying the luminescence generated by the nucleic acid probe. .
- luminescence by the luminescent substance F is detected. This detection may be performed visually or using a fluorescence microscope, a CCD camera, or the like.
- the target nucleic acid detection method of the present invention is suitable for high-sensitivity, high-accuracy, and high-speed detection of trace amounts of various target nucleic acids, and can be suitably applied to the drug screening method of the present invention described later. is there.
- the drug screening method of the present invention includes a hybridization step and a target nucleic acid detection step, and further includes other steps appropriately selected as necessary.
- the above-mentioned hybridization step is a step of hybridizing the nucleic acid probe of the present invention to the target nucleic acid which has been expressed or not expressed by the administration of a drug in the same manner as described above. [0114] Target nucleic acid detection step
- the target nucleic acid detection step is a step of detecting the target nucleic acid by detecting the signal generated when the nucleic acid probe of the present invention hybridizes to the target nucleic acid.
- the target nucleic acid detection step is the same as the target nucleic acid detection step in the target nucleic acid detection method.
- a drug is screened based on the presence or absence of the target nucleic acid detected in the target nucleic acid detection step. That is, by detecting the amplified luminescence and observing the change in the expression level of the gene after drug administration, this screening can be performed in living cells such as cells, tissues and organs. The action or side effect of the drug can be screened efficiently.
- mRNA expressed by the drug is isolated, cDNA is prepared by reverse transcription reaction, amplified by PCR, and the amplified cDNA is labeled and labeled.
- the drug screening method of the present invention can introduce the nucleic acid probe directly into living cells, so that it can be performed quickly and easily. Screening can be performed.
- the drug screening method of the present invention uses living cells to fix cells and to detect mRNAs and the like that could not be detected due to the inability to perform biological activities. It is advantageous in that it can detect or analyze the behavior and can detect or analyze a small amount of mRNA, etc., and also can screen for a desired inhibitor as shown in FIG.
- new effects and side effects of existing drugs can be known by detecting trace genes (presence or absence of target nucleic acid), and can also be used for doping tests for athletes and drug detection tests for drug addicts, etc. Can be applied.
- the drug to be screened by the drug screening method of the present invention can be appropriately selected depending on the particular purpose, and may be, for example, a drug acting on a peripheral nerve, a drug acting on a central nervous system, a hormonal drug, an otacoid, or a circulatory organ.
- a drug acting on a peripheral nerve a drug acting on a central nervous system
- a hormonal drug an otacoid
- a circulatory organ Systemic, respiratory, digestive, genitourinary, skin, vitamins, chemotherapeutics, disinfectants, preservatives, biologicals, herbal medicines, etc. , Existing or new drugs Yes.
- peripheral nerve agent examples include local anesthetics, muscle relaxants, agents acting on the autonomic nervous system, and the like.
- Examples of the local anesthetic include cocaine, tropacocaine, proforce in, lidocaine, bupino force in, mepino force in, tetracaine, jib force in and the like.
- muscle relaxant examples include d-bobclare, gallamine, panclopam, veclopam, decamethonium, suxametonium, dantrolin and the like.
- autonomic nervous agent examples include epinephrine, norepinephrine, isoproterenol, dominine, fenrefreline, methoxamine, clonidine, metalaminol, naphazoline, dobutamine, methoxyphenamine, orciprenaline, terbutaline, chlorprenaline.
- Examples of the central nervous system acting agent include nitrous oxide, cyclopropane, ethylene, ether, chloroform, halothane, methoxyflurene, enflurane, isoflurane, sevoflurane, tiopental, thiamylal, hexovalpital, pentoval Pital, Propside, ketamine, phenobarbital, bromperyl urea, bromethyl acetyl urea, chloral hydrate, daltesimide, methaqualone, nitrazepam, flurazepam, estazolam, triazolam, etylparafinol, etchlorbinol, ethinol alcohol , Methyl alcohol, disulfiram, phytoin, mefatein, esotoin, phenovalpital, nettalbital, primidone, carbamazepine, zo-samide, trimetad
- the hormonal agent is not particularly limited as long as it has or inhibits hormonal action, for example, growth hormone, thyroid stimulating hormone, adrenocortical stimulating hormone, follicle stimulating hormone, luteinizing hormone, lactating hormone, Oxytocin, vasobretsin, thyroid hormone, liothyronine sodium, levothyroxine sodium, methylthioperasinole, propylthioperacil, thiamazonole, canolecitone, parathyroid honolemon, insulin, glucagon, carptamide, chlorpropamide, acetohexamide , Tolazamide, Hetahexamide, 1-Butyl-3-Trowrea, Tolptamide, Daribendalamide, Darimiji , Gribazole, fenformin, pformin, metformin, epalrestat, voglibose, acarnose, troglitazone, cortisone, hydrocortisone, des
- Examples of the eotacoid include histamine, diphenhydramine, diphen-rubiraline, clemastine, pyrilamine, promethazine, chlorpheniramine, chlorcyclidine, sip mouth heprazin, mequitazine, terfenadine, cimetidine, ranitidine, famotidine, diphenidine.
- Examples of the above-mentioned circulatory system drugs include digitalis, zelkova squirrel, strophane fungus, force and know, digitoxin, digoxin, methyl digoxin, G-strophanthinin, lanatoside C, porossilaridi, vavine, and j8 receptor.
- Examples of the above-mentioned respiratory agents include, for example, carbon dioxide, dimorpholamine, dimephrine, doxapram, saponins, non-saponin glycosides, potassium iodide, bromhexine, methyllucistin, ethyl cysteine, a Cetylcysteine, carbocysteine, ambrokinol, xanthine derivatives, sodium cromoglycate, ketotifen, tralast, azelastine, oxatomide, ozadarel, suplatast tosilate, terfenadine, astemizole, serratrodast, pranlukast hydrate, etc. No.
- conjugator-based agents examples include sodium bicarbonate, magnesium oxide, natural aluminum silicate, dried hydroxylated aluminum gel, parasympathetic blocker, pirenzepine, thixidum, cimetidine, famotidine.
- Phenolphthalein picosulfate, magnesium sulfate, magnesium oxide, sodium sulfate, glycerin, bisacodyl, albumin tannate, precipitated calcium carbonate, medicated charcoal, ahen alkaloid, berberine, lactamine, metoclopramide, domperidone, cisapride, trimebutine And so on.
- Examples of the urinary reproductive system acting drug include D-mantol, concentrated glycerin, salted ammonium salt, ammonium nitrate, calcium chloride, mercury diuretic, acetazolamide, Dichlonolephenamide, Tricronolemethiazide, Hydrochloride thiazide, Benzinolehydrochlorothiazide, Penflutide, Methiclothiazide, Metrazone, Chlortharidone, Furosemide, Ethacrynic acid, Pyreta-d, Bumemethamide, Azosemide, Mefurcid, Spitonorataton , Triamethylene, potassium canrenoate, hexamine, mandelic acid, nitrofurantoin, ergotoxin, enoregotamine, enolegometri, methinoleenolegomethrin, oxitocin, dinoprost, dinoprostone, gemeprost, spartin
- Examples of the skin and mucous membrane active agents include power brush, cantharis, capsicum, tannic acid, gallic acid, zinc oxide, lead monoxide, lead tetroxide, zinc sulfate, lead acetate, aluminum sulfate, and sulfuric acid.
- vitamin preparation examples include vitamin A and vitamin.
- chemotherapeutic agent examples include penicillins, cefms, oxacephems, monopactams, carpanems, 13-lactamase inhibitors, fosfomycins, aminoglycosides, chloramphenicol, tetracyclines, macrolides Lincomycin, rifamycin, antimycobatate limb, polyene macrolide, antibiotics such as synthetic antibacterials, sulfa drugs, quinolone drugs, pitarabin, idoxperidine, acyclovir, ganciclovir, zidovosine, didanodine, interferon, amantadine, Emetine, pyrimethamine, cloquinine, primaquine, quinacrine, metro-dazole, pentamidine isethionate, santonin, kainic acid, piperazine salt, pyrantel pamoate, praziquantel, camara, antimony tartrate Thorium
- Examples of the biological agent include diphtheria, tetanus mixed vaccine, oral live polio vaccine, dried attenuated rubella vaccine, dried attenuated measles vaccine, influenza HA vaccine, Japanese encephalitis vaccine, dried BCG vaccine, smallpox vaccine, Cholera vaccine, Weil's disease fall sickness mixed vaccine, tetanus toxoid, diphtheria toxoid, gas gangrene antitoxin, diphtheria antitoxin, snake antitoxin, tetanus antitoxin, purified tuberculin, BCG and the like.
- herbal medicine examples include, for example, Annaka-san, Choto-san, Oren-gedokuto, Keishi-bukuryogan, Shogaku-hu Hot water, Yokukansan, Hachimi Jiohgan, Kakoch and the like.
- Preferred examples of the target nucleic acid detection device of the present invention include the following first and second target nucleic acid detection devices.
- the first target nucleic acid detection device is a nucleic acid analysis device in which a nucleic acid probe for detecting a target nucleic acid in a sample is immobilized on a carrier, and the nucleic acid probe hybridizes to a target nucleic acid.
- the nucleic acid probe which undergoes a structural change after the shrinking, is designed so that the binding force of the hybridization decreases and the target nucleic acid force dissociates.
- the second target nucleic acid detection device includes a hybridization means for hybridizing the nucleic acid probe of the present invention to a target nucleic acid, an hybridization means, and the nucleic acid probe force when hybridized to the target nucleic acid.
- Target nucleic acid detection means for detecting the presence of the target nucleic acid by detecting the generated signal.
- the hybridization means is not particularly limited as long as the nucleic acid probe of the present invention can be hybridized to the target nucleic acid, and can be appropriately selected according to the purpose.
- the above-mentioned nucleic acid chip is preferably used.
- the target nucleic acid detection means is means for detecting the target nucleic acid by detecting the signal generated when the nucleic acid probe of the present invention hybridizes to the target nucleic acid, and includes, for example, the signal described above.
- a light emitting device for example, a light receiving device, a camera, etc.
- a photosensitive film can be mentioned.
- a magnetic sensor can be used, in the case of a cut piece, electrophoresis, SDS-PAGE, Western blotting, and the like can be used.
- an antibody, an HPLC, and an antibody can be used.
- the signal is generated when the nucleic acid probe hybridizes to the target nucleic acid.
- the target detection means includes: Fluorescent microscopes, photosensitive films, CCD cameras and the like are preferred.
- the target nucleic acid detecting means can determine not only the presence of the target nucleic acid but also the amount thereof.
- Examples of the other means include, for example, a database section for storing a gene information database, and a data analysis for comparing and analyzing the detection result data of the target nucleic acid detection means with the gene information data stored in the database section.
- a communication unit capable of communicating with the Internet and accessing the genetic information database on the Internet, and comparing the detection result data of the target nucleic acid detecting means with the gene information data of the genetic information database on the Internet.
- a data analysis unit to be analyzed is preferably used.
- the gene information database can be appropriately selected depending on the purpose of the restriction, but is preferably a database containing healthy person genetic information and patient genetic information relating to a specific disease.
- the target detection of the present invention including the nucleic acid chip of the present invention as the hybridization means and the fluorescence microscope as the target detecting means is preferred.
- the device further includes a CPU 31, an input device 32, a memory 33, a communication device 34, a database device 36, and a main bus 37 for connecting these devices in a bidirectional communication manner.
- the CPU 31 controls the entire target nucleic acid detection device, operates based on programs and various data stored in the memory 33, and realizes various functions.
- the various functions include a remote diagnosis function for diagnosing data received from another target nucleic acid detection device, a collation process for unifying different signals in order to control the exchange of information with other providers and other servers.
- Function a database processing function for providing various information on the target nucleic acid, and the like. Examples of the various data include data of various lists created for genetic diagnosis.
- the input device 32 is a device for the administrator of the provider to input information such as genetic diagnosis conditions.
- the memory 33 has a function of storing a program to be accessed by the CPU 31, the gene information database, information received by the target nucleic acid detection device, information read from the storage device 35, the database device 36, and the like as necessary. It has.
- the communication device 34 is a device that controls communication with the outside via the Internet, the communication line 15, and the like.
- the communication device 34 may include, for example, a modem as a conversion device, or may include a terminal adapter (TA) and a digital service unit (DSU) interposed for connection to an ISDN line.
- TA terminal adapter
- DSU digital service unit
- the storage device 35 has a function of storing and storing various programs and various data.
- the storage device 35 includes a ROM 38 as storage means, a recorder 39 for reading a storage medium stored in the ROM 38, and the like.
- Examples of the storage device 35 include, in addition to an electronic memory circuit (electronic storage medium) such as a ROM, a magnetic storage device using a magnetic storage medium such as a floppy disk as the storage medium, and an optical storage medium such as a CD-ROM.
- An optical storage device used as a storage medium is exemplified.
- the storage medium may be a medium fixedly provided in the storage device 35 or a medium provided detachably.
- the programs, data, and the like stored in the storage device 35 may be received from a storage device outside the target nucleic acid detection device via communication means.
- the database device 36 stores therein a past data list of the target nucleic acid and the like.
- the gene diagnosis method of the present invention includes a target nucleic acid expression level quantification step and a diagnosis step using the target gene detection device of the present invention, and further includes other steps appropriately selected as necessary.
- the target nucleic acid expression level quantifying step is a step of quantifying the expression level of the target nucleic acid relating to the specific disease in the subject.
- This step can be suitably performed by the above-described target nucleic acid detection method of the present invention using the target nucleic acid detection device of the present invention.
- the nucleic acid probe of the present invention it can be performed by preparing a calibration curve representing the relationship between the expression level of the target nucleic acid and the luminescence level in advance, and quantifying using the calibration curve.
- the expression level of the target nucleic acid relating to the specific disease in the subject and the expression level of the target nucleic acid relating to the specific disease in a healthy subject and the expression level of a patient included in the genetic information database are determined. This is a step of diagnosing whether or not the subject is a patient with the specific disease by making a comparison using a data analysis unit.
- the diagnosis step can be suitably performed by the database unit, the data analysis unit, the communication unit, the data analysis unit, and the like in the target detection device of the present invention.
- a program of the gene diagnosis method is stored in the storage device 35 described above, and the S value and the M value in (Xi-SZ MS) described later, in which the past detection data power is averaged, are stored in the database device 36.
- the disease gene (Xi described above) of the subject is quantified by the target nucleic acid detector, the CPU calculates the (Xi-SZM-S), and the health condition of the subject is stored. Is diagnosed by the CPU.
- the gene diagnosis method of the present invention is advantageous in that diagnosis can be performed even in a remote place or the like.
- the expression level of a target gene relating to a specific disease in a patient is M
- the expression level in a healthy subject is S
- the expression level in a subject is Xi
- the subject may be diagnosed as a patient with the specific disease.
- Such calculations can be performed instantaneously by the CPU or the like in the target nucleic acid detection device, and in this case, high-speed computer diagnosis can be performed.
- (Xi-SZM-S) When the value of (Xi-SZM-S) is 0.1 or less, it generally means that there is no disease factor, that the prognosis is good, and the like.
- the expression of the target nucleic acid (disease gene) When the expression of the target nucleic acid (disease gene) is approaching a specific disease state, and exceeds 0.9, the expression level of the target nucleic acid (disease gene) is 90% for patients and factors having the disease gene. Means close to a healthy person with
- the other steps can be appropriately selected depending on the particular purpose, and include, for example, a selection step of force-selecting some candidates for a disease gene.
- the disease or disease that can be diagnosed by the genetic diagnosis method of the present invention is particularly Restrictions can be appropriately selected depending on the purpose to be used, for example, cancer, alcaptonuria, systemic lupus erythematosus, dermatomyositis, rheumatoid arthritis, scleroderma, psychosis, bronchial asthma, atopic dermatitis, Hay fever, lupus nephritis, Creutzfeldt-Jakob disease, Alzheimer's disease, Parkinson's disease, Marfan syndrome, Williams syndrome, aplastic anemia, erythrocytosis, Fanco syndrome, hemophilia A, hemophilia B, Hon Willebrand's disease, platelet asthenia, idiopathic thrombocytopenic purpura, Tadaak-Higashi syndrome, Pemphigus vulgaris, Frehry's syndrome, Fragile X syndrome, Edward syndrome, Miller-Degger syndrome, Pradavilli'
- the genetic diagnosis method of the present invention can perform not only these diagnoses, but also the prognosis estimation and the risk estimation for diseases, and the target nucleic acid can be used to evaluate the adaptability of the living body to the administered drug. Analysis can also be performed based on the expression level of (gene). [0142] Hereinafter, examples of the present invention will be described, but the present invention is not limited to these examples.
- nucleic acid probe of the present invention As a nucleic acid probe of the present invention, a known ribozyme (8-17 DNAzyme) having base sequences 3a and 3b at both ends, which are regions capable of hybridization to the target nucleic acid, is used. Was used.
- the nucleotide sequence had the nucleotide sequence shown in Sequence 1 below, and the rA as the cleavage site was located at the 15th position from the 5'-terminal side.
- the cleavage active region having the activity of cleaving rA as the cleavage portion includes T located at the 32nd position by counting the 5 'end side force, and 46 from the 5' end side.
- Thymine (dT) that is, dimethylaminobenzenesulfur (DABSYL) -dT (manufactured by Glen Research) was used, and the nucleic acid probe of Example 1 was prepared as described above.
- the first A from the 5 'end to the 10th C from the 5' end was designated as 3b, and the first C from the 3 'end to the 10th C from the 3' end was designated as 3a.
- FIG. 2 is a diagram schematically illustrating the one-dimensional structure of the nucleic acid probe of Example 1, in which the base sequence 3a side is the 3 ′ terminal side, and the base sequence 3b side is the 5 ′ terminal side (see above (( The left and right sides of the arrangement 1) are reversed).
- the cleavage part is cleaved and the nucleic acid probe of Example 1 is combined with the first probe fragment.
- the light emitting part is present on the first probe fragment
- the quenching part is present on the second probe fragment. Will be.
- FIG. 3 is a diagram schematically illustrating a three-dimensional structure when the nucleic acid probe of Example 1 is applied to the target nucleic acid.
- FIG. 3 when hybridization to the target nucleic acid has two regions that can be hybridized within the molecule and that are located adjacent to each other with the cut portion as the center (between), When the one closer to the base sequence 3a and 3b side is Y and the other is Z, it is the base sequence power of the Y, the base sequence power of the Z, and the sum of the Y and Z.
- the number of base sequences was 8.
- the nucleic acid probe of Example 1 designed as described above is solid-phase synthesized by solid-phase synthesis using a DNA synthesizer, deprotected, and the nucleic acid probe having a target chain length is obtained by gel electrophoresis. Only was separated and purified.
- A-TOM-CE Phosphoramidites
- the luminescent substance F and the quenching substance Q were protected, and the DNA synthesizer (manufactured by Glen Research) was used.
- the nucleic acid probe of the present invention into which the above-mentioned labeling substance was introduced at a concentration of L mol was synthesized by the solid-phase method using the above method.
- the product was transferred to a tube, to which 1.5 ml of methylamine (an equal mixture of a 40% aqueous solution of methylamine and a 33% methioamine in ethanol) was added, and the mixture was heated at 35 ° C for 6 hours. After incubation, the nucleic acid probe was removed from the solid phase, and the protecting group of the labeling substance was removed.
- methylamine an equal mixture of a 40% aqueous solution of methylamine and a 33% methioamine in ethanol
- nucleic acid probe After equilibrating a NAP-25 column (manufactured by Pharmacia) with 15 ml of water, 2 ml of the nucleic acid probe solution was added to the NAP-25 column. After the nucleic acid probe solution was completely permeated into the column, 0.5 ml of distilled water was added thereto, and so-called gel filtration was performed to remove impurities. Further, the desalted nucleic acid probe was eluted using 3 ml of distilled water.
- the gel-filtered nucleic acid probe was lyophilized and purified by 20% polyacrylamide gel electrophoresis containing 7M urea. After the electrophoresis, the band of the nucleic acid probe was confirmed by UV irradiation, and the fraction of the band was cut out. The fraction was placed in a centrifuge tube, the gel was crushed using a glass rod, 10 ml of water was added, and the mixture was shaken at 37 ° C for 6 hours. After dialysis, a freeze-drying treatment was performed to obtain a solid. The solid was dissolved in 0.4 ml of distilled water and stored frozen at 20 ° C.
- a 22 nt oligonucleotide having a base sequence shown in the following sequence 2 was prepared.
- the precipitate from which the ethanol was completely removed by the vacuum drying was dissolved in formaldehyde 51 and subjected to electrophoresis using a 20% polyacrylamide gel containing 7 M urea.
- the nucleic acid probe fragment shorter in length than the nucleic acid probe was observed.
- the nucleic acid probe hybridized with the target nucleic acid, and the cleavage active region caused self-cleavage of the cleavage portion.
- the target nucleic acid lOpmol and the nucleic acid probe lOOpmol were combined with 50 mM Tris-25 mM Incubation was carried out at 37 ° C. for 6 hours in an aqueous solution of magnesium chloride (pH 7.2) at 100 ° C. (magnesium ion concentration was 25 mM).
- the reaction solution was irradiated with excitation light having a wavelength of 495 nm, and the change in the fluorescence spectrum at a measured fluorescence wavelength of 520 nm was measured using a fluorescence meter (RF-5300PC, manufactured by Shimadzu Corporation). From the increase in the intensity of the fluorescence, it was confirmed that the nucleic acid probe hybridized with the target nucleic acid and the cleavage active region caused self-cleavage of the cleavage portion.
- Fig. 4 shows a graph obtained by determining the amount of cleavage of the nucleic acid probe.
- the solid line indicates the amount of cleavage of the nucleic acid probe determined from the intensity of the light emission
- the dotted line indicates the theoretical value when a conventional nucleic acid probe that cannot amplify the light emission is used.
- nucleic acid probe of the present invention a nucleic acid probe having a base sequence of the following sequences 3 to 5 was selected. Specifically, X-side sequences (5'-terminal force GTAGGAGT) and 3, 3'-terminal sequences following the 3'-terminal side of the X sequence located at the terminal side, which are regions capable of hybridization to the target nucleic acid, A single-stranded DNA random sequence pool was prepared having at both ends a 5 sequence of the Y sequence located at the terminal side and a Y sequence (3 ′ terminal side GTG CCAGG) following the terminal side.
- the DNA random sequence pool contains a large number of base sequences having different lengths and sequence types between the X-side sequence (base sequence number: 8) and the Y-side sequence (base sequence number: 8). It is.
- the DNA random sequence pool was prepared from the Y sequence located at the 3 ′ end and the cytosine (C) located at the 5 end of the Y sequence among the Y sequences.
- the base sequence is extended one base at a time to synthesize a random sequence following the Y-side sequence, and the 5 'end of the random sequence is linked to the 3' end of the X sequence and the 5 'end of the X sequence.
- the guanine (G) on the 3 'side in the above was bound to synthesize. Note that this random distribution
- the row contains one rA (base is adenine and sugar is ribose) as the cleavage site.
- the selected base sequence had the base sequence shown in the following sequences 3-5!
- rA as the cleavage site was located at the 14th position, including the force on the 5 'end.
- the cleavage active region having the activity of cleaving rA as the cleavage portion includes T located at the 29th position by counting the force at the 5 'end, and T from the 5' end. It was between A and 43rd.
- rA as the cleavage site was located at the twentieth position, counting the force on the 5 'end.
- the cleavage active region having the activity of cleaving rA as the cleavage portion includes T at the 35th position by counting the force at the 5 'end, and T from the 5' end. It was between the 49th A.
- sequence 4 as the 28th base (T (dT)) from the 5 'end, a quenching substance (Q) as the quenching part: thymine (dT) to which dimethylaminobenzenesulfol (DABSYL) is bound, That is, using dimethylaminobenzenesulfur (DABSYL) -dT (manufactured by Glen Research), 5, a fluorescent substance (F) as the fluorescent part: fluorescein was bound to the end, That is, fluorescein (manufactured by Glen Research) was bound, and the nucleic acid probe of sequence 4 in Example 2 was prepared as described above.
- Q quenching substance
- DT thymine
- DBSYL dimethylaminobenzenesulfol
- F fluorescent substance
- rA as the cleavage site was located at the 18th position, counting the force on the 5 'end. Further, the cleavage active region having the activity of cleaving rA as the cleavage portion (indicating ribozyme activity) includes T located at the 33rd position by counting the 5 ′ terminal side force, and T from the 5 ′ terminal side.
- a quenching substance (Q) as the quenching part: thymine (dT) to which dimethylaminobenzenesulfol (DABSYL) is bound That is, using dimethylaminobenzenesulfur (DABSYL) -dT (manufactured by Glen Research),
- a fluorescent substance (F) as the fluorescent part: fluorescein was bound to the end, That is, fluorescein (manufactured by Glen Research) was bound, and the nucleic acid probe of sequence 5 in Example 2 was prepared.
- FIG. 5B is a diagram schematically illustrating the one-dimensional structure of the nucleic acid probe of Example 2.
- the X sequence at the 5 ′ end is 2 bases CC from the 5 ′ end, and the Y sequence at the 3 ′ end is 3 ′ end.
- the base (T) located at the * mark is thymine (T (dT)) to which quenching substance Q, dimethylaminobenzenesulfol (DABSYL) is bound, that is, dimethyl Phosphoric acid to which fluorescein, which is a luminescent substance F, is bound as a base located at the 5'-terminal (most terminal) using aminobenzenesulfur (DABSYL) -dT (manufactured by Glen Research).
- the group used was fluorescein phosphoramidite (Glen Reserch).
- the number of base sequences in the region hybridizing with the target nucleic acid was 10 at the 3 ′ end and 10 at the 5 ′ end.
- the X sequence at the 5 'end is 8 bases of AAAAAGCC from the 5' end, and the Y sequence at the 3 'end is 3 bases.
- the X sequence at the 5 'end is 6 bases of AAAAAG from the 5' end, and the Y sequence at the end is 0.
- Roamidite manufactured by Glen Research was bound to the nucleic acid probe of SEQ ID NO: 5, and in one of the nucleic acid probes, the number of nucleotide sequences in the region hybridizing with the target nucleic acid was as follows: The 5 'end was 8, and the 3' end was 8.
- the nucleic acid probe of sequence 3 may be referred to as a ⁇ TASC1 probe ''
- the nucleic acid probe of sequence 4 may be referred to as a ⁇ Locked TASC2 probe ''
- the nucleic acid probe of sequence 5 may be referred to as a ⁇ Locked TASC3 probe ''. is there.
- each of the nucleic acid probes of Sequences 3 to 5, as shown in FIG. 5A when hybridized to the target nucleic acid, a region capable of hybridization and hybridization is formed in the molecule.
- the two are located adjacent to each other with the cut portion (rA) at the center (between), the one closer to the X array and the Y array is Y, and the other is Z, Had a base sequence number of 3, and had a base sequence number of Z of 3, and a total base sequence number of Y and Z of 6.
- the cleavage active region (having ribozyme activity) is formed on the side opposite to the cleavage portion (rA).
- the cleavage active region had a 3 bp complementary strand site.
- Each of the nucleic acid probes of the above-mentioned sequences 3-5 contains, before hybridization with the above-mentioned target nucleic acid, the above-mentioned X sequence located at the 5 'end (the 5' most end) and the 3 ' Since it is located at the terminal side and shifted to the 5 ′ end side instead of the most terminal side and has generated a hybrid between the complementary sequence to the X sequence and the force molecule, as shown in the right of FIG. It had a stem loop structure. This stem-loop structure was released when the nucleic acid probe hybridized to the target nucleic acid.
- the nucleic acid probe of Example 2 is the Locked TASC probe, and before hybridization to the target nucleic acid, maintains the stem-loop structure and does not form the cleavage active region, and The cleavage active region was formed only after the stem-loop structure was released upon hybridization.
- the nucleic acid probe designed as described above is solid-phase synthesized by a solid-phase synthesis method using a DNA synthesizer, deprotected, and only the nucleic acid probe having a target chain length is determined by gel electrophoresis. Separation and purification were performed as follows.
- the synthesized product was transferred to a tube, and an equivalent amount of a methylamine solution (40% aqueous solution of methylamine (75590, manufactured by Huriki Co.) and a 33% methylamine'ethanol solution (75580, manufactured by Huriki Co., Ltd.) were Add 1.5 ml of the mixture and incubate at 35 ° C for 6 hours. The impurities were removed.
- a methylamine solution 40% aqueous solution of methylamine (75590, manufactured by Huriki Co.
- a 33% methylamine'ethanol solution 75580, manufactured by Huriki Co., Ltd.
- the tube After cooling the tube on ice, the tube was carefully opened, the supernatant was collected and lyophilized. After the freeze-drying, 1 ml of a 1 M tetrabutylammonium-tetrahydrofuran (THF) solution was added to the tube, and the tube was shaken at 50 ° C for 10 minutes, cooled to 35 ° C, and then cooled again. After shaking for a time, the protecting group attached to the nucleic acid probe was removed.
- THF tetrabutylammonium-tetrahydrofuran
- the nucleic acid probe was purified by 8% polyacrylamide gel electrophoresis containing 7 M urea. After the electrophoresis, the band of the nucleic acid probe was confirmed by UV irradiation, and this fraction was cut out. The fraction was placed in a centrifuge tube, the gel was crushed using a glass rod, 10 ml of water was added, and the mixture was shaken at 37 ° C for 6 hours. After dialysis, a freeze-drying treatment was performed to obtain a solid. The solid was dissolved in 0.4 ml of distilled water and stored frozen at -20 ° C.
- oligonucleotide shown in the following sequence 6 and a 22 nt oligonucleotide shown in the following sequence 7 were prepared. These oligonucleotides are the RNA sequence of the 16S ribosomal RNA 326-347 region of Escherichia coli K12-MG1655, respectively, and the DNA sequence obtained by replacing it with DNA.
- a 500 pmol aqueous solution of the target nucleic acid or an aqueous solution (two types) without addition, the nucleic acid probe aqueous solution of sequence 3 and the nucleic acid probe aqueous solution of sequence 4 were combined in the following combinations by ⁇ mol each. And then added to 100 mM 25 mM magnesium chloride 50 mM Tris-HC1 buffer solution (pH 7.2) and incubated for 3 hours (magnesium ion concentration is 25 mM). The reaction solution was analyzed by acrylamide electrophoresis, and the cut band was measured using a densitograph (manufactured by ATTO).
- Said sequence 4 of the nucleic acid probe In the reaction solution only was added an aqueous solution of (Locked TASC2 probe 5 'sequence of the ends 3' is GAA AAA 5 '), said Kobs- is, 1. 0 X 10- 5 min- 1 or less, and the nucleic acid probe of the sequence 4, in case of adding a target nucleic acid of the sequence 6, Kobs + is 4. a 4 X 10- 3 min- 1. Parameters as an alosteric effector: Kobs + ZKobs—was over 440. When the reaction time was set to 24 hours, self-cleavage in the reaction solution to which only the nucleic acid probe of Sequence 4 was added was 3% or less. From the results, it can be seen that the presence of the stem-loop structure improves the false positive reaction in which the cleavage active region causes the cleavage of the cleavage part before hybridization to the target nucleic acid. I found out.
- Example 2 the nucleic acid probe of Sequence 4 (Locked TASC2 probe), the nucleic acid probe of Sequence 5 (Locked TASC3 probe), and the nucleic acid probe of Sequence 3 and the target nucleic acid of Sequence 6 were not used.
- the nucleic acid sequence of the following sequence 8 (differing by 2 bases from the complementary strand to the nucleic acid probe of the sequence 5) and the target nucleic acid of the following sequence 9 (differing by 1 base in the complementary strand to the nucleic acid probe of the sequence 5) Except that was used in the same manner as in Example 2.
- the target nucleic acid of Sequence 8 has two nucleotide sequences different from the complementary strand portion of the nucleic acid probe, and the target nucleic acid of Sequence 9 has one nucleotide sequence different from the complementary strand portion of the nucleic acid probe. Is different.
- nucleic acid probe (Locked TASC3 probe) solution of the array 5 was added in the sequence 6, in Kobs (full) 1S 4. 3 X 10- 3 min- 1
- a nucleic acid probe (Locked TASC3 probe) solution of the array 5 the reaction solution and the target nucleic acid has been added in the sequence 8
- Kobs (l-mis + ) is, 1 X 10- 5 min- 1 below
- Kobs (2-mis + ) is, 1. 0 X 10- 5 or less Met.
- Parameter as a steric effector Kobs (full) / Kobs "(11-mis +) was over 440.
- Example 3 the nucleic acid probe of Sequence 5 (Locked TASC3 probe) solution was used, and the nucleic acid probe of Sequence 4 (Locked TASC2 probe) was not used. 25 mM magnesium chloride 50 mM Tris-HCL buffer solution (pH 7.2) 100 1 Instead of using, in the same manner as in Example 2 except that an equal amount of 900 mM NaC 150 mM Tris-HCL buffer solution (pH 7.2) 1001 was used, the nucleic acid probe (Locked TASC3 probe) solution of sequence 5 and The reaction with the target nucleic acid solution of Sequence 6 was performed, and the reaction solution was spotted on a fluorescein 96-well microplate (manufactured by Corning Incorporated) and observed with a fluorescent imager (Balsadok 3000 fluorescein imager, bio-Radonna earth). The results are shown in FIG.
- E. coli is cultured until the OD value of the bacterial suspension reaches 0.5, and 167 ⁇ l of the bacterial suspension is cultured.
- Probe (Locked TASC3 probe) Tris-HC1 buffer (50 mM, pH 7.2, 0.1% SDS) (25 mM MgCl or 0.9 M NaCl, containing the 10 M helper oligonucleotide or nothing above) (Including ⁇ ).
- This mixed solution (three kinds: a mixed solution in which the above 25 mM MgCl is present and the helper oligonucleotide aqueous solution is not added), and a mixed solution in which the above 0.9 M NaCl is present and the above helper oligonucleotide aqueous solution is added
- the mixture obtained by adding the above-mentioned aqueous solution of the helper oligonucleotide to the presence of 25 mM MgCl) was incubated at 37 ° C. 31. The mixture was centrifuged several times, and observed using a fluorescence microscope (manufactured by KS Olympus).
- nucleotide sequences of the helper oligonucleotides are shown in the following sequences 10 and 11.
- FIG. 11a (left photograph) is an image of the mixed solution in which the helper oligonucleotide aqueous solution was not added and the MgCl aqueous solution was added, and no light emission was observed.
- FIG. 11 b (center photograph) is an image of a mixture obtained by adding the helper oligonucleotide aqueous solution and the NaCl aqueous solution, and only weak fluorescence was observed.
- FIG. 11a left photograph
- FIG. 11 b (center photograph) is an image of a mixture obtained by adding the helper oligonucleotide aqueous solution and the NaCl aqueous solution, and only weak fluorescence was observed.
- 11c (right photograph) is an image of a mixed solution obtained by adding the above-mentioned aqueous solution of the helper oligonucleotide and the above-mentioned aqueous solution of MgCl, and strong light emission was confirmed.
- the nucleic acid probe can be introduced into bacterial cells, and the luminescence is amplified by adding the helper oligonucleotide and the MgCl (the presence of magnesium ions). confirmed.
- Example 6 In Example 2, a nucleic acid probe of Example 6 was synthesized in the same manner as in Example 2, except that a nucleic acid probe having a base sequence of the following sequences 12 to 15 was designed.
- the nucleic acid probes of Sequences 12 to 15 are nucleic acid probes serving as models of the nucleic acid probes of Sequences 4 and 5 (having a stem-loop structure).
- Example 2 the temperature conditions were changed by replacing the nucleic acid probe with the sequence 3-5 with the nucleic acid probe with the sequence 12-15 and replacing the target nucleic acid with the sequence 6-7 with the target nucleic acid with the sequence 16-17. Then, the absorbance of the reaction solution at 260 nm was measured in the same manner as in Example 2, except that the reaction solution was composed of the following combination of the nucleic acid probe and the target nucleic acid.
- FIG. 13 shows the relationship between the absorbance and the temperature.
- the nucleic acid probe of Sequence 12 has a complete stem-loop structure before hybridization to the target nucleic acid (FIG. 12A), and has a line 1 curve shown in FIG. The central Tm value was 43 ° C. From this result, it was found that the stem-loop structure in the nucleic acid probe of Sequence 4 and the nucleic acid probe of Sequence 5 was temperature-resistant, and the nucleic acid probe of Sequence 13 and the target nucleic acid of Sequence 16 were compared. No., the result of hybridization is shown by line 2 in FIG. 13, and the result of hybridization of the nucleic acid probe of sequence 13 and the target nucleic acid of sequence 17 is shown by line 3. (This is the form of FIG. 12B). The center Tm value in the curve of the line 2 was 62 ° C, and the center Tm value in the curve of the line 3 was 53 ° C.
- the results obtained by subjecting the nucleic acid probes of Sequences 14 and 15 and the target nucleic acid of Sequence 16 to hybridization are shown by a line 4 in FIG. 13, and the nucleic acid probes of Sequences 14 and 15 and the nucleic acid probe of Sequence 17 are shown.
- the result of the hybridization with the target nucleic acid is shown by the line 5 in FIG. 13 (in the form of FIG. 12C).
- the center Tm value in the curve of the line 4 was 50 ° C
- the center Tm value in the curve of the line 5 was 43 ° C.
- the nucleic acid probe of Example 7 was synthesized in the same manner as in Example 2 except that the base sequence of the following sequence 18 was designed.
- rA as the cleavage site was located at the twentieth position, counting the force on the 5 'end.
- a quenching substance (Q) as the quenching part thymine to which dimethylaminobenzenesulfol (DABSYL) is bound as the 28th base (T (dT)) from the 5 ′ end in sequence 18 (DT), that is, dimethylaminobenzenesulfur (DABSYL) -dT (manufactured by Glen Research), and a fluorescent substance (F): fluorescein as the fluorescent part is bonded to the 5 ′ end. That is, fluorescein (manufactured by Glen Research) was bound thereto, whereby the nucleic acid probe having the sequence 18 in Example 7 was prepared.
- Q quenching substance as the quenching part: thymine to which dimethylaminobenzenesulfol (DABSYL) is bound as the 28th base (T (dT)) from the 5 ′
- Hela cells (uterine cancer cells) were cultured in Dulbecco's medium for 1 day, and it was confirmed under a microscope that they proliferated! /. After confirming that the concentration was 1 ⁇ 10 5 cells / ml, 100 ⁇ l was dispensed into a 96-well plate. After washing with 100 microliters of PBS buffer, the nucleic acid probe of Example 7 targeting the cfos gene (1 microliter) was added together with lipofectin (manufactured by Invitrogen), and the cells were cultured at 37 ° C for 1 hour. . Fluorescent light was detected using a fluorescent microscope (KS-Olinos, FV500).
- Hela cells (uterine cancer cells) were cultured in Dulbecco's medium for 1 day, respectively, and proliferation was confirmed under a microscope. After confirming that the concentration was 1 ⁇ 10 5 cells / ml, the mixture was dispensed into a 96-well plate with 100 liters per mouth. The culture solution was supplemented with growth factor EGF and a tyrosine kinase inhibitor, and cultured at 37 ° C for 6 hours. After washing with 100 microliters of PBS buffer, the nucleic acid probe of Example 8 (1 microliter) targeting the EGFR signal marker cfos gene was added together with lipofectin (manufactured by Invitrogen), and the mixture was added at 37 ° C. Culture for hours.
- the fluorescence spectrum was confirmed using a fluorescence microscope (KS Olympus, FV500). As a control, luminescence was detected from the cells not supplemented with the tyrosine kinase inhibitor, but significant fluorescence amplification was observed from the cells added with the tyrosine kinase inhibitor.
- nucleic acid probe of the present invention provides useful information for screening pharmaceuticals.
- Example 2 the nucleic acid probe of Sequence 5 (Locked TASC3 probe) was used.
- the reaction was performed in the same manner as in Example 2 except that the final concentration was performed in an aqueous solution of MgCl of ImM, aqueous solution of 5 mM MgCl, aqueous solution of 10 mM MgCl, aqueous solution of 15 mM MgCl, aqueous solution of 20 mM MgCl, and aqueous solution of 30 mM MgCl
- the nucleic acid probe of sequence 5 is reacted with the target nucleic acid of sequence 6, and the reaction solution is spotted on a fluorescein 96-well microplate (manufactured by Corning Incorporated) and observed with Parsadoc 3000 Fluoroscein 'Imager (manufactured by Bio-Radonnay Earth). did.
- the preferred concentration of MgCl to be added was 20 mM to 30 mM.
- the force of a nucleic acid probe hybridized to a target nucleic acid enhances the luminescence that is generated, thereby enabling high-sensitivity, high-accuracy, high-speed detection of a very small amount of a target nucleic acid with extremely high selectivity for a target nucleic acid.
- a nucleic acid probe suitable for a genetic diagnosis, a test for the presence of food poisoning bacteria, a diagnosis of caries and periodontal disease, a blood test, and the like.
- the nucleic acid probe of the present invention is particularly suitable for the detection of minute amounts of target nucleic acids (genes) such as viruses, bacteria, animal cells, and plant cells. It is particularly suitable for the analysis of the disease state of humans, and can improve the life span and quality of life of human beings.
- the nucleic acid probe does not require enzymes or reagents, does not require heating or the like, and can function even at a living body temperature, and can detect a target nucleic acid without breaking cells that do not need to amplify the signal to give cell death. Is advantageous.
- nucleic acid chip suitable for periodontal disease diagnosis, blood test, and the like can be provided. Since the nucleic acid chip uses the nucleic acid probe of the present invention, the effect of the nucleic acid probe can be exhibited as it is.
- a target nucleic acid detection method and a target nucleic acid detection device capable of high-sensitivity, high-accuracy, high-speed detection or analysis of a minute amount of a target nucleic acid by using the nucleic acid probe.
- the target nucleic acid detection method and target nucleic acid detection device of the present invention can reduce the time and effort of hospital visits, and can be used for patients in remote areas and patients in rural areas and countries where hospital visits are long. Quality of life can be improved. Since the target nucleic acid detection method and the target nucleic acid detection device use the nucleic acid probe of the present invention, the effects of the nucleic acid probe can be exhibited as they are.
- the present invention it is possible to provide a drug screening method capable of analyzing the administration effect of a drug and efficiently screening a desired drug by using the nucleic acid probe.
- the drug screening method of the present invention is a revolutionary technology that can revolutionize the pharmaceutical industry that clarifies side effects and mechanism of action from powerful genetic information that has not been obtained so far, and realizes tailor-made medicine. is there. Since the drug screening method uses the nucleic acid probe of the present invention, the effect of the nucleic acid probe can be exhibited as it is.
- the present invention it is possible to provide a gene diagnosis method capable of diagnosing with high efficiency and high accuracy whether or not a patient has a specific disease by using the nucleic acid probe.
- the genetic diagnosis method of the present invention can improve the QOL of patients in remote areas, and patients in rural areas and countries where the distance to the hospital is long, by saving labor for going to the hospital. Since the gene diagnosis method uses the nucleic acid probe of the present invention, the effect of the nucleic acid probe can be exhibited as it is.
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Abstract
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Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP04787923A EP1717313A4 (en) | 2003-09-22 | 2004-09-21 | NUCLEIC ACID PROBE, NUCLEIC ACID CHIP, METHOD FOR DETECTION OF TARGET NUCLEIC ACID, METHOD FOR DETECTING MEDICINE, APPARATUS FOR DETECTING TARGET NUCLEIC ACID, AND GENE DIAGNOSTIC METHOD |
JP2005514080A JPWO2005028647A1 (ja) | 2003-09-22 | 2004-09-21 | 核酸プローブ、核酸チップ、標的核酸検出方法、薬剤スクリーニング方法、標的核酸検出装置及び遺伝子診断方法 |
US11/384,858 US20080124706A1 (en) | 2003-09-22 | 2006-03-21 | Nucleic acid probe, nucleic acid chip, method for detecting target nucleic acid, method for screening drug, apparatus for detecting target nucleic acid, and, gene diagnosis method |
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JP2003-329619 | 2003-09-22 | ||
JP2003329619 | 2003-09-22 |
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US11/384,858 Continuation US20080124706A1 (en) | 2003-09-22 | 2006-03-21 | Nucleic acid probe, nucleic acid chip, method for detecting target nucleic acid, method for screening drug, apparatus for detecting target nucleic acid, and, gene diagnosis method |
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WO2005028647A1 true WO2005028647A1 (ja) | 2005-03-31 |
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PCT/JP2004/013740 WO2005028647A1 (ja) | 2003-09-22 | 2004-09-21 | 核酸プローブ、核酸チップ、標的核酸検出方法、薬剤スクリーニング方法、標的核酸検出装置及び遺伝子診断方法 |
Country Status (4)
Country | Link |
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US (1) | US20080124706A1 (ja) |
EP (1) | EP1717313A4 (ja) |
JP (1) | JPWO2005028647A1 (ja) |
WO (1) | WO2005028647A1 (ja) |
Cited By (1)
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JP2017126212A (ja) * | 2016-01-14 | 2017-07-20 | 富士通株式会社 | パスウェイ解析プログラム、パスウェイ解析方法、及び、情報処理装置 |
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US20100092980A1 (en) * | 2008-10-02 | 2010-04-15 | Blood Systems, Inc. | Reagent for elimination of red blood cells and hemoglobin in a sample |
US8470308B2 (en) * | 2009-01-03 | 2013-06-25 | Ray C. Wasielewski | Enhanced medical implant comprising disrupted tooth pulp and tooth particles |
US10328103B2 (en) | 2009-01-03 | 2019-06-25 | Ray C. Wasielewski | Medical treatment composition comprising mammalian dental pulp stem cells |
WO2010147673A2 (en) * | 2009-06-19 | 2010-12-23 | University Of Florida Research Foundation, Inc. | Single-dna molecule nanomotor regulated by photons |
JP5936541B2 (ja) * | 2010-07-16 | 2016-06-22 | 日本碍子株式会社 | 識別対象を識別するための識別情報の保持体及びその利用 |
US20160202154A1 (en) * | 2013-09-05 | 2016-07-14 | Nec Solution Innovators, Ltd. | Method for producing sample and method for analyzing target |
JP7035972B2 (ja) * | 2018-11-09 | 2022-03-15 | 横河電機株式会社 | 核酸配列計測用デバイス |
CN115232616B (zh) * | 2022-06-30 | 2023-10-03 | 昆明学院 | 基于防己诺林碱碳点的比率型荧光探针的制备方法及应用 |
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- 2004-09-21 EP EP04787923A patent/EP1717313A4/en not_active Withdrawn
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Cited By (1)
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JP2017126212A (ja) * | 2016-01-14 | 2017-07-20 | 富士通株式会社 | パスウェイ解析プログラム、パスウェイ解析方法、及び、情報処理装置 |
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US20080124706A1 (en) | 2008-05-29 |
EP1717313A4 (en) | 2007-11-14 |
JPWO2005028647A1 (ja) | 2006-11-30 |
EP1717313A1 (en) | 2006-11-02 |
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