WO2005015211A1 - 核酸分子を固定化するための固体支持体 - Google Patents
核酸分子を固定化するための固体支持体 Download PDFInfo
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- WO2005015211A1 WO2005015211A1 PCT/JP2004/010600 JP2004010600W WO2005015211A1 WO 2005015211 A1 WO2005015211 A1 WO 2005015211A1 JP 2004010600 W JP2004010600 W JP 2004010600W WO 2005015211 A1 WO2005015211 A1 WO 2005015211A1
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- Prior art keywords
- nucleic acid
- solid support
- acid molecule
- group
- immobilized
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Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
- G01N33/48—Biological material, e.g. blood, urine; Haemocytometers
- G01N33/50—Chemical analysis of biological material, e.g. blood, urine; Testing involving biospecific ligand binding methods; Immunological testing
- G01N33/53—Immunoassay; Biospecific binding assay; Materials therefor
- G01N33/543—Immunoassay; Biospecific binding assay; Materials therefor with an insoluble carrier for immobilising immunochemicals
- G01N33/54353—Immunoassay; Biospecific binding assay; Materials therefor with an insoluble carrier for immobilising immunochemicals with ligand attached to the carrier via a chemical coupling agent
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
- G01N33/48—Biological material, e.g. blood, urine; Haemocytometers
- G01N33/50—Chemical analysis of biological material, e.g. blood, urine; Testing involving biospecific ligand binding methods; Immunological testing
- G01N33/53—Immunoassay; Biospecific binding assay; Materials therefor
- G01N33/543—Immunoassay; Biospecific binding assay; Materials therefor with an insoluble carrier for immobilising immunochemicals
- G01N33/54366—Apparatus specially adapted for solid-phase testing
Definitions
- the present invention relates to a solid support for immobilizing a nucleic acid molecule, a method for immobilizing a nucleic acid molecule, a solid support on which a nucleic acid molecule is immobilized, and a method for detecting a nucleic acid molecule using the same.
- a DNA chip is used as an analysis means.
- a DNA chip is in the form of a microarray in which a large number of DNA fragments are aligned and immobilized on a solid support such as a slide glass, and a DNA fragment sample complementary to the DNA fragments immobilized on the DNA chip is used. It is immobilized on a DNA chip by hybridization and used for detection.
- a means for detecting the formed hybrid a method using a fluorescent label or a radioactive label previously bound to a DNA fragment sample, a method using an intercalator having a fluorescence-generating group or a conductive group incorporated into the hybrid, etc. It has been known
- the method for immobilizing the DNA fragment on the surface of the solid support includes the following methods depending on the type of the DNA fragment and the type of the solid support.
- the DNA fragment to be immobilized is a cDNA (complementary DNA obtained by converting mRNA to type II) or a PCR product (a DNA fragment obtained by amplifying cDNA by PCR), these are prepared on a DNA chip.
- a spotter device provided on the device, spotting is performed on the surface of a solid support that has been surface-treated with polycations (polylysine, polyethylenimine, etc.), and is electrostatically coupled to the solid support using the charge of DNA.
- polycations polylysine, polyethylenimine, etc.
- a method for treating the surface of a solid support a method using a silane coupling agent having an amino group, an aldehyde group, an epoxy group, or the like is also used (for example, see Non-Patent Document 1).
- amino groups, aldehyde groups, etc. are introduced into the surface of the solid support by covalent bonds. Therefore, they exist on the surface of the solid support more stably than in the case of polycations.
- a solid support in which a surface treatment layer and a chemically modified layer having a functional group capable of covalently binding to a nucleic acid molecule are sequentially provided on the surface of a substrate has been developed (for example, see Patent Documents 11 to 13).
- the DNA fragment to be immobilized is a synthetic oligonucleotide
- a method of synthesizing an oligonucleotide into which a reactive group has been introduced, spotting the oligonucleotide on the surface of a surface-treated solid support, and covalently binding the oligonucleotide is known. It is known (for example, see Non-Patent Document 2).
- a method in which an amino group-introduced oligonucleotide is reacted with an amino group-introduced slide glass in the presence of PDC (p-phenylenediisothiosinate), and an aldehyde group-introduced oligonucleotide is reacted with the slide glass is known. In these two methods, the oligonucleotide is stably immobilized on the surface of the solid support as compared with the above-mentioned method using the charge of DNA.
- the detection limit is important. Therefore, the development of technology to stably immobilize DNA fragments in a sufficient amount on the surface of a solid support will greatly contribute to improving the detection limit of hybridization between the immobilized DNA fragments and labeled sample nucleic acid fragments. .
- the amount of immobilized DNA and the binding strength of DNA of the conventional solid support are not necessarily sufficient, and it is desired to develop a solid support having a higher amount of DNA immobilized and higher DNA binding strength. ing.
- Patent Document 1 WO 00/22108 pamphlet
- Patent Document 2 WO 02/12891 pamphlet
- Patent Document 3 JP 2002-82116 A
- Non-Patent Document 1 Geo, Z. et al "Nucleic Acid Research, 22, 5456-5465 (1994)
- Non-Patent Document 2 "Protein / Nucleic Acid 'Enzyme", Vol. 43, (1998), 2004-2011
- An object of the present invention is to provide a solid support in which the amount of immobilized nucleic acid molecules is higher and the binding strength of nucleic acid molecules is higher.
- the inventors of the present invention have conducted intensive studies to solve the above-mentioned problems, and as a result, have formed a diamond-like carbon layer on a substrate and introduced a maleimide group via an amino group into this layer.
- the inventors have found that the amount of immobilized molecules and the binding strength of nucleic acid molecules are significantly improved, and have completed the present invention.
- the present invention includes the following inventions.
- n is an integer from 1 to 12
- a solid support to which a group represented by is covalently bonded is covalently bonded.
- a nucleic acid molecule-immobilized solid support obtained by binding a nucleic acid molecule having an SH group introduced to a maleimide group on the solid support according to (1).
- n is an integer from 1 to 12
- the method for producing a solid support according to (1) which comprises reacting the compound represented by the formula or a salt thereof.
- a method for detecting a nucleic acid molecule comprising:
- FIG. 1 shows the results of ESCA analysis of the surface of the solid support of the present invention prepared in Example 1.
- FIG. 2 shows the result of taking an image of the solid support after hybridization in Example 2-5 with a fluorescent scanner.
- the solid support of the present invention has a structure in which a diamond-like carbon layer is provided on a substrate, and a chemical modifying group is bonded to the surface thereof.
- Examples of the material of the substrate used in the present invention include silicon, glass, fiber, wood, paper, ceramics, and plastics (eg, polyester resin, polyethylene resin, polypropylene resin, ABS resin (Acrylonitrile Butadiene Styrene resin)) , Nylon, acrylic resin, fluorine resin, polycarbonate resin, polyurethane resin, methylpentene resin, phenol resin, melamine resin, epoxy resin, and vinyl chloride resin.
- a silicon substrate it is preferable to use a silicon substrate.
- a surface treatment layer of diamond-like carbon is formed on the substrate.
- Diamond-like carbon (DLC) is a general term for imperfect diamond structures, which are mixtures of diamond and carbon, and the mixing ratio is not particularly limited.
- the thickness of the surface treatment layer is preferably lnm-100zm.
- the surface treatment layer of the substrate is formed by a known method, for example, microwave plasma CVD.
- C_ and VD Electrode Vapor Deposit and C_ and VD (Electnc and yclotron Resonance and chemical Vapor D mark osit) method, ICPQnductive Coupled Plasma) method, DC sputtering method, ECR (Electric Cyclotron Resonance) sputtering method, ion plating method, Arcio It can be performed by a plating method, an EB (Electron Beam) evaporation method, a resistance heating evaporation method, an ionization evaporation method, an arc evaporation method, a laser evaporation method, or the like.
- EB Electrode
- An example of the surface-treated substrate is a substrate obtained by forming a diamond-like carbon film on a silicon substrate.
- a substrate is preferably prepared by ion-deposition evaporation in a mixed gas containing 0 to 99% by volume of hydrogen gas and 100 to 1% by volume of methane gas remaining. .
- solid support of the present invention not only the structure having the surface treatment layer formed as described above, but also a laminate or a composite of diamond-like carbon and a substrate material (for example, diamond-like carbon and another substance) Complex, (eg, a two-phase body).
- a laminate or a composite of diamond-like carbon and a substrate material for example, diamond-like carbon and another substance
- Complex eg, a two-phase body
- DNA By forming a diamond-like carbon layer on a substrate, DNA can be immobilized at a high density and a high S / N ratio can be obtained, thus enabling highly sensitive detection. Also, it can be used repeatedly.
- the shape and size of the substrate are not particularly limited.
- examples of the shape include a plate shape, a thread shape, a spherical shape, a polygonal shape, and a powder shape.
- a single layer of Ti, Au, Pt, Nb, Cr, TiC, TiN or the like or a composite film thereof may be formed as a reflective layer on the front surface or the back surface of the substrate.
- the thickness of the reflective layer is preferably 10 nm or more, more preferably 100 nm or more, because it is necessary that the thickness be uniform throughout.
- the surface is intentionally roughened in Ra (JIS B 0601) in the range of lnm 1000 ⁇ m. Such a roughened surface This is advantageous in that the surface area of the DNA probe increases and a large amount of DNA probes and the like can be immobilized at high density.
- an amino group is introduced into the substrate provided with the diamond-like carbon layer.
- the introduction of the amino group can be carried out by irradiating the substrate provided with the diamond-like carbon layer with ultraviolet rays in chlorine gas to chlorinate the surface, and then irradiating the substrate with ultraviolet rays in ammonia gas.
- it can be carried out by subjecting the substrate provided with the diamond-like carbon layer to a plasma method in an ammonia atmosphere.
- the plasma method is a method in which plasma is generated in a DC or AC discharge under vacuum conditions, for example, benzene or methane is used as a source gas, and a biased substrate is treated with an ionized gas. It is.
- n is an integer from 1 to 12, preferably from 4 to 6, more preferably 5.
- formula The salt of the compound represented by II is not particularly limited, but, for example, a sodium salt, a potassium salt and the like can be used. It is preferred to use the sodium salt.
- the reaction is carried out by immersing the solid support having the amino group introduced therein in a solution containing the compound of the formula II at a concentration of usually 0.1 to 100 mM in a buffer.
- a nonophore PBS, triethanolamine buffer, sodium borate buffer and the like can be used.
- PBS PBS (pH 69) is used.
- the reaction temperature is usually 10 to 80 ° C, preferably ⁇ 25 to 30 ° C, and the reaction time is usually 1 to 300 minutes, and preferably ⁇ 30 to 60 minutes.
- the chemical modifying group having a maleimide group is strongly bonded to the carbon in the diamond-like carbon layer by a covalent bond, so that it is also exfoliated by a change in washing temperature. It is also possible to store the solid support for a long period of time.
- the nucleic acid molecule having the SH group introduced therein can be effectively bound to the solid support. Further, since the maleimide group has high selectivity for the SH group, the nucleic acid molecule having the SH group introduced therein can be specifically bound to the solid support.
- Introduction of SH groups into the nucleic acid molecules can be carried out by conventional methods used in the art (BA Connally and P. Rider, Nucleic Acids Research, 1985, 13, 4485-4502) 0 guide of the SH group The insertion is generally introduced at the 5 'end or 3' end of the nucleic acid molecule chain, but the introduction site is not limited to the end unless it hinders the hybridization.
- the nucleic acid molecule Since the SH group reacts with the maleimide group to form a covalent bond, the nucleic acid molecule is firmly bound to the chemical modifying group of the present invention. That is, the nucleic acid molecule is covalently bonded to the 3-position of the maleimide group via an iodo atom.
- Any nucleic acid molecule such as DNA and RNA can be immobilized on the solid support of the present invention by introducing an SH group, and the type thereof can be selected according to the purpose.
- polynucleotides such as cDNA, cDNA fragments, and ESTs. These polynucleotides may be of unknown function, but generally Specifically, it is prepared by amplifying by PCR using a cDNA library, genomic library or whole genome as a template based on the sequences registered in the database. Those that do not amplify can also be used.
- oligonucleotides corresponding to the mutations and polymorphisms are synthesized based on a known sequence as a standard, and use them. Further, in the case of nucleotide sequence analysis, it is preferable to use 4 n (n is the length of base) oligonucleotides synthesized.
- the nucleotide sequence of the DNA fragment is preferably determined in advance by a general nucleotide sequencing method.
- the number of bases in the nucleic acid molecule to be immobilized is usually 11 to 200, preferably 5 to 150.
- DNA can be immobilized in either a single strand or a double strand.
- nucleic acid molecule into which the SH group has been introduced is dissolved in a spotting buffer, and spotted on the solid support of the present invention, whereby the nucleic acid molecule can be immobilized.
- the nucleic acid molecule into which the SH group has been introduced is dissolved in a spotting buffer so as to have a concentration of usually 0.1 to 500 ⁇ M, preferably 5 to ⁇ ⁇ M, to prepare a spotting solution.
- a buffer for spotting 50% PEG (polyethylene glycol) solution, PBS (phosphate buffered saline), 50% DMSO (dimethyl sulfoxide), 3X SSC (saline sodium citrate), pure water, etc. Can be used.
- PBS phosphate buffered saline
- the maleimide group has the best reaction efficiency at around pH 7 as soon as it is hydrolyzed.
- the prepared spotting solution can be dispensed into a 96- or 384-well plastic plate, and the dispensed solution can be spotted on a solid support by a spotter or the like. At this time, by arranging various types of nucleic acid molecules in an array as independent spots, it is possible to simultaneously detect whether or not the plurality of types of nucleic acid molecules hybridize with the target nucleic acid.
- Incubation is usually performed at a temperature of 10 to 80 ° C, preferably 25 30 ° C, for a period of usually 0.5 to 10 hours, preferably 112 hours. Incubation is preferably performed in a high-humidity atmosphere, for example, at a humidity of 50 to 90%. Following the incubation, washing is preferably performed using a washing solution (eg, 2 ⁇ SSC / 0.2% SDS) to remove nucleic acid molecules that are not bound to the solid support.
- a washing solution eg, 2 ⁇ SSC / 0.2% SDS
- the present invention also relates to a method for immobilizing a nucleic acid molecule sample having complementarity to a nucleic acid molecule immobilized on a solid support as described above on a solid support by hybridization and detecting the same.
- RNA fragment sample As a nucleic acid molecule used as a sample, it is preferable to use a DNA fragment sample or an RNA fragment sample whose sequence and function are unknown.
- the sample nucleic acid molecule is preferably isolated from eukaryotic cell or tissue samples for the purpose of examining gene expression. If the sample is mRNA, it is preferably extracted from a tissue sample in which mRNA is expressed.
- mRNA is labeled dNTP by reverse transcription reaction ("dNTP" means deoxyribonucleotide whose base is adenine (A), cytosine (C), guanine (G) or thymine (T)).
- dNTP means deoxyribonucleotide whose base is adenine (A), cytosine (C), guanine (G) or thymine (T)).
- dNTP means deoxyribonucleotide whose base is adenine (A), cytosine (C),
- the sample nucleic acid molecule is preferably prepared by PCR of the target region in a reaction system containing a labeled primer or labeled dNTP.
- the hybridization is performed.
- Labeling of a sample nucleic acid molecule can be easily carried out, for example, by using a labeled primer to which a label has been preliminarily bound as a primer when a target nucleic acid molecule is amplified by PCR.
- the label is not particularly limited as long as it can be incorporated into a nucleic acid molecule. FAM, HEX, ROX, etc.) and radioactive labels ( ⁇ _32 ⁇ , y_32P, 35S etc.).
- a fluorescently labeled nucleic acid molecule it can be detected as an image by taking a fluorescence image of the solid support after the hybridization.
- a sample of the sample nucleic acid molecule is prepared as a hybridization solution by dissolving in a hybridization buffer such that the concentration is usually 0.01 ⁇ M, preferably 110 ⁇ M.
- the solution for hybridization is dropped on the solid support on which the nucleic acid molecules prepared above are immobilized, followed by incubation to allow hybridization.
- Incubation is carried out usually at 30 to 70 ° C, preferably 45 to 60 ° C, usually for 0.5 to 16 hours, preferably for 114 hours. No. It is also preferable to carry out the incubation in a high-humidity atmosphere in the hybridization step. Finally, after washing and drying the solid support, detection is performed by reading the label.
- the solid support of the present invention can also be used for an extension reaction of a nucleic acid molecule, for example, DNA.
- a primer is immobilized on a solid support, and single-stranded or double-stranded DNA is hybridized. Thereafter, a DNA complementary to the DNA hybridized to the primer is extended by a DNA extension reaction.
- the primer may be peeled off by heat treatment in the extension reaction.
- the primer does not peel off even when heat is applied, and the primer is attached to the solid support.
- the extension reaction can be allowed to proceed in the immobilized state.
- the labeled nucleic acid is incorporated, and after the extension reaction, the signal derived from the label is read to determine whether the specific DNA has hybridized to the primer and whether the extension reaction has proceeded. Can be detected. Therefore, it is possible to determine whether or not the tested sample contains a hybridizable DNA in the primer on the immobilized support, which can be a useful detection means in research and medical care.
- the present invention will be described with reference to Examples, but the present invention is not limited thereto.
- a DLC layer having a thickness of 100 ⁇ m was formed on a silicon substrate cut into a 3 mm square by using the gas obtained by mixing 95% by volume of methane gas and 5% by volume of hydrogen at an accelerating voltage of 0.5 kV by ion ion deposition. After that, amination was performed for 10 minutes by a plasma method in an ammonia gas atmosphere.
- a reaction solution having the following composition was prepared, and the aminated solid support was immersed in the reaction solution for 30 minutes. Thereafter, the substrate was washed three times with pure water and vacuum dried at 100 ° C for 30 minutes.
- Snoreho EMCS (Dojindo Laboratories, Inc.) is a sodium salt in which n is 5 in the compound of the above formula II. Sulfo EMCS 12.3mg [lmM]
- ESCA analysis of the surface of the solid support before and after the reaction showed that the peak intensities of O and N increased after the reaction (Fig. La). From the narrow scan after the reaction, a new peak appears at around 289 eV (Fig. Lb). ⁇ and N peaks are considered to be derived from maleimide groups 0 and N. The peak newly appearing at around 289 eV is considered to be derived from the imide moiety of maleimide. From the above, it can be seen that a maleimide group was introduced on the surface of the solid support.
- R-WT (5,1-ACTGGCCGTCGTT TTACAACGT-3 ′) (SEQ ID NO: 1), 5 ′ terminal SH-modified R—WT in which an SH group was introduced was used.
- F_WT (3′_TGACCGG CAGCAAAATGTTGCA-5 ′) (SEQ ID NO: 2) labeled with Cy5 was used. All of these modified oligo DNAs were obtained from SIGMA GENOSYS.
- the spotting solution was prepared by dissolving the 5 ′ terminal SH-modified R—WT in 1 ⁇ PBS solution (pH 7.4) using the force of a 20% PEG solution to prepare a spotting solution. DNA hybridization was detected in the same manner as described above.
- the spotting solution is prepared by dissolving the 5 'terminal SH-modified R-WT in lXPBS (pH 7.4) solution by the force of the 20% PEG solution. Instead, DNA hybridization was detected in the same manner as in Example 2 except that spotting was performed in a total of two points of 0.3 ⁇ 1 each using a micropitor.
- FIG. 2 shows the results of the fluorescence images obtained in Examples 2-5.
- the results of Example 5 show that the solid support of the present invention binds SH-modified oligo DNA more selectively than NH-modified oligo DNA.
- a nucleic acid molecule can be immobilized firmly and at a high density on a solid support. Therefore, the use of the solid support of the present invention enables production of a DNA chip having a high detection limit. By performing hybridization with a sample nucleic acid molecule using such a DNA chip, a nucleic acid molecule complementary to a DNA fragment immobilized on the DNA chip can be detected with high sensitivity.
- a DNA chip useful for monitoring gene expression, determining a nucleotide sequence, analyzing a mutation, analyzing a polymorphism, and the like can be provided.
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| Application Number | Priority Date | Filing Date | Title |
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| JP2003-288073 | 2003-08-06 | ||
| JP2003288073A JP2005055365A (ja) | 2003-08-06 | 2003-08-06 | 核酸分子を固定化するための固体支持体 |
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| WO2017030196A1 (ja) * | 2015-08-20 | 2017-02-23 | 東京エレクトロン株式会社 | 培養容器並びに該培養容器を使用した細胞培養方法及び細胞観察方法 |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2000270896A (ja) * | 1999-01-28 | 2000-10-03 | Canon Inc | プローブ結合基板、プローブ結合基板の製造方法、プローブアレイ、標的物質の検出方法、サンプル中の一本鎖核酸の塩基配列を特定する方法、及びサンプル中の標的物質の定量方法 |
| JP2001178466A (ja) * | 1999-12-22 | 2001-07-03 | Fuji Photo Film Co Ltd | Dna断片固定固相担体、dna断片固定固相担体の製造方法および核酸断片試料の検出方法 |
| JP2002211954A (ja) * | 2000-11-07 | 2002-07-31 | Toyo Kohan Co Ltd | 粗面化スライドグラス及びそれを用いて生体物質を解析する方法 |
| JP2002365293A (ja) * | 2001-06-08 | 2002-12-18 | Toyo Kohan Co Ltd | 表面処理層が形成された固体支持体 |
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2000270896A (ja) * | 1999-01-28 | 2000-10-03 | Canon Inc | プローブ結合基板、プローブ結合基板の製造方法、プローブアレイ、標的物質の検出方法、サンプル中の一本鎖核酸の塩基配列を特定する方法、及びサンプル中の標的物質の定量方法 |
| JP2001178466A (ja) * | 1999-12-22 | 2001-07-03 | Fuji Photo Film Co Ltd | Dna断片固定固相担体、dna断片固定固相担体の製造方法および核酸断片試料の検出方法 |
| JP2002211954A (ja) * | 2000-11-07 | 2002-07-31 | Toyo Kohan Co Ltd | 粗面化スライドグラス及びそれを用いて生体物質を解析する方法 |
| JP2002365293A (ja) * | 2001-06-08 | 2002-12-18 | Toyo Kohan Co Ltd | 表面処理層が形成された固体支持体 |
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