WO2019231230A1 - Appareil de réaction en chaîne de la polymérase et procédé de réaction en chaîne de la polymérase l'utilisant - Google Patents

Appareil de réaction en chaîne de la polymérase et procédé de réaction en chaîne de la polymérase l'utilisant Download PDF

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WO2019231230A1
WO2019231230A1 PCT/KR2019/006420 KR2019006420W WO2019231230A1 WO 2019231230 A1 WO2019231230 A1 WO 2019231230A1 KR 2019006420 W KR2019006420 W KR 2019006420W WO 2019231230 A1 WO2019231230 A1 WO 2019231230A1
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nano
light
chain reaction
polymerase chain
transparent
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PCT/KR2019/006420
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English (en)
Korean (ko)
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정기훈
이영섭
강병훈
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한국과학기술원
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Priority claimed from KR1020190019825A external-priority patent/KR102220637B1/ko
Application filed by 한국과학기술원 filed Critical 한국과학기술원
Priority to US17/058,444 priority Critical patent/US20210205816A1/en
Publication of WO2019231230A1 publication Critical patent/WO2019231230A1/fr

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01L—CHEMICAL OR PHYSICAL LABORATORY APPARATUS FOR GENERAL USE
    • B01L7/00—Heating or cooling apparatus; Heat insulating devices

Definitions

  • the present invention relates to a polymerase chain reaction apparatus and a polymerase chain reaction method using the same, and in detail, a polymerase chain reaction apparatus capable of fast and simple, easy to use and high portability, and a polymerase chain reaction using the same. It is about a method.
  • Molecular diagnostics play an important role in a variety of fields, from medical to forensic, by analyzing unique biomarkers (DNA, RNA, proteins, etc.). Recently, the field of molecular diagnostics has been actively researched for molecular diagnostic methods for point-of-care (POC), which enables timely diagnosis and personalized treatment of various diseases including infectious diseases and cancer.
  • POC point-of-care
  • diagnostic technology is inexpensive, portable, simple, easy to use, and quick to obtain results (Affordable, Small, Simple, User-friendly, Rapid & robust, Equipment). must have the ASSURED criteria for free and disposable.
  • PCR Polymerase Chain Reaction
  • DNA polymerase uses complementary DNA as a template for single stranded DNA. This single stranded DNA can be obtained simply by boiling the double stranded DNA. This process is called DNA denaturation.
  • DNA polymerase In order for DNA polymerase to begin DNA replication, the starting site must be in the form of two strands of DNA.
  • a small piece of DNA capable of complementarily binding to template DNA should be put together at both ends of the DNA sequence to be amplified, and this should be annealed at both ends of a specific DNA sequence to form a double stranded DNA. Only then can DNA replication by DNA polymerase be initiated. Small pieces of DNA capable of complementarily binding to the template DNA ends are referred to as oligonucleotide primers or, in short, primers. Once the primer binds to the template DNA end, DNA synthesis proceeds to the opposite end by the action of DNA polymerase.
  • the PCR cycle is a denaturation step that converts two-stranded template DNA into extrastranded DNA, an annealing step in which the primer binds to the template DNA end, and a DNA polymerase. It consists of three stages of elongation, where DNA synthesis reaches the opposite end. In the subsequent PCR cycle after the first one PCR cycle, both the original template DNA and the newly synthesized DNA by PCR become DNA templates. As the PCR cycle is repeated continuously, the number of DNA templates increases rapidly.
  • the three-step reaction of denaturation-annealing-elongation is controlled by temperature, so that the PCR cycle can correspond to the temperature cycle of denaturation temperature-bonding temperature-extension temperature.
  • PCR devices that form these temperature cycles are commonly referred to as thermal cyclers.
  • thermocycler to adjust the temperature of the metal plate based on the Peltier element (Peltier element) to create a temperature cycle.
  • Peltier element Peltier element
  • Conventional thermocycler for PCR is widely used in most laboratories and hospitals. However, due to its bulky size, high power consumption, and long time to obtain results, it is not suitable for in situ diagnostic molecular diagnosis that needs to be diagnosed in real time in the field.
  • PCR technologies have been studied since the first generation PCR method. For example, a method of increasing a sample surface area exposed to heat using a capillary tube, a method using a microfluidic substrate (Korean Patent No. 10-0756874), a method using a droplet and a laser have been reported.
  • newly developed PCR techniques also have low portability, low amplification efficiency, require treatment by a skilled professional, or are too expensive to be used for single use, requiring specialized maintenance of the device. There is a limit to use it directly for molecular diagnosis for on-site diagnosis.
  • the present invention provides a polymerase chain reaction apparatus and polymerase chain reaction method using the same which can be used for molecular diagnostics for on-site diagnosis.
  • the present invention provides an ultrafast polymerase chain reaction device and a polymerase chain reaction method using the same.
  • the present invention provides a polymerase chain reaction apparatus capable of observing amplification degree of a substance (nucleic acid, etc.) by a polymerase chain reaction in real time, and a polymerase chain reaction method using the same.
  • the polymerase chain reaction apparatus includes a transparent photothermal substrate including a transparent plate on which transparent nano-column arrays are arranged spaced apart from each other, and plasmonic metal nano-islets located on a surface including upper and side surfaces of the nano-column; A light source positioned below the photothermal substrate and irradiating light to the plasmonic metal nanoislets; And a chamber holding a fluid heated by the transparent photothermal substrate.
  • the plasmonic metal nanoislets may be spaced apart from each other.
  • the average diameter of the nano-pillars is 50 to 1000 nm
  • the aspect ratio obtained by dividing the average length of the nano-pillars by the average diameter may be 0.1 to 10.
  • the coverage is the ratio of the area covered by one surface by the nano-pillar array in the area of one surface, based on one surface of the transparent plate on which the nano-pillar array is located May be 0.1 to 0.9.
  • the nanoislets located on the upper surface of the nano pillars have a shape corresponding to the upper surfaces of the nano pillars, and the nano islands located on the side surfaces of the nano pillars.
  • Silver may have an average diameter of 5 to 100 nm.
  • the photothermal substrate may further include a heat dissipation layer covering the nano pillars on which the plasmonic metal nano islands are located.
  • the light of the light source may be visible to near infrared.
  • the chamber has an inner space partitioned by a lower surface and a side, and the fluid may be retained in the inner space.
  • the chamber is located in contact with the metal nano-islet located on the upper surface of the nano-pillar to surround the nano-plate array and the top plate covering the nano-pillar array Extending from the top plate, one end may include a side portion in contact with the transparent plate.
  • the polymerase chain reaction device may further include a temperature sensor for measuring the temperature of the space in which the fluid is held in the photothermal substrate or the chamber.
  • the apparatus further comprises a light irradiation control unit for controlling the light source, wherein the light irradiation control unit is selected from at least one of light intensity, light irradiation time and light irradiation period. You can control the factor.
  • the light irradiation control unit may control the light source to meet a preset temperature profile.
  • the polymerase chain reaction device may further include a detector for detecting a Raman signal generated in the fluid.
  • the present invention includes a polymerase chain reaction method using the polymerase chain reaction apparatus described above.
  • the polymerase chain reaction method according to the present invention is a polymerase chain reaction method using the above-described polymerase chain reaction device, the method comprising: a) injecting a fluid targeted for polymerase chain reaction into a chamber; And b) irradiating the transparent photothermal substrate with light generated from the light source such that the fluid conforms to a temperature profile over time.
  • the temperature according to the time by controlling at least one factor selected from the intensity of light, light irradiation time and irradiation period of the light irradiated to the transparent photothermal substrate
  • the profile can be satisfied.
  • the temperature profile according to the time is a temperature increase from the annealing temperature (denaling) to the denaturation temperature (denaturation) and a temperature reduction from the denaturation temperature to the binding temperature as the cycle It may be a profile in which the cycle is repeated.
  • the surface-enhanced Raman scattering analysis is performed by irradiating excitation light for Raman scattering on the fluid or by irradiating light from a light source.
  • Performing; may further include.
  • the polymerase chain reaction device includes a transparent plate having transparent nano pillar arrays spaced apart from each other, and a transparent photothermal substrate including plasmonic metal nano islands positioned on a surface including upper and side surfaces of the nano pillars.
  • the transparent photothermal substrate for generating a plasmonic photothermal effect is positioned on a surface including a transparent plate and a top surface and side surfaces of the transparent nanopillar array in which the nanopillar arrays are spaced apart from each other.
  • FIG. 1 is a cross-sectional view showing a transparent photothermal substrate in a PCR device according to an embodiment of the present invention.
  • FIG. 2 is a view showing absorbance for each wavelength of light of a transparent photothermal substrate according to an embodiment of the present invention.
  • FIG. 3 is a scanning electron micrograph of the top of the transparent photothermal substrate prepared according to an embodiment of the present invention.
  • FIG. 4 is a scanning electron micrograph of the side of the transparent photothermal substrate prepared in accordance with an embodiment of the present invention.
  • FIG. 5 is a diagram illustrating an apparatus of a PCR device manufactured according to an embodiment of the present invention.
  • FIG. 6 is a cross-sectional view showing another example of a transparent light-heat substrate in an embodiment of the present invention.
  • FIG. 7 illustrates a transparent photothermal substrate and a chamber in an embodiment of the present invention.
  • FIG. 8 is a diagram illustrating a temperature mapping result of a chamber according to whether optical photographs and light irradiation of a PCR device manufactured according to an embodiment of the present invention are performed.
  • FIG. 9 is a view showing the measurement of the temperature cycle characteristics according to the control of light irradiation in the PCR device manufactured according to an embodiment of the present invention.
  • FIG. 10 is a diagram illustrating a set temperature profile and control conditions of a light source implementing the temperature profile in a PCR device manufactured according to an embodiment of the present invention.
  • FIG. 11 is a diagram showing the results of SERS analysis of amplified DNA using a PCR device prepared according to an embodiment of the present invention.
  • FIG. 12 is a view showing the results of real-time surface enhanced Raman scattering spectroscopic analysis of DNA during the amplification process using a PCR device prepared according to an embodiment of the present invention.
  • PCR device comprises a transparent photothermal substrate comprising a transparent plate formed with a transparent nano-column array spaced apart from each other and a plasmonic metal nano-islets located on the surface including the upper surface and side surfaces of the nano-pillar; And a light source positioned below the photothermal substrate and irradiating light to the plasmonic metal nanoislets. And a chamber holding a fluid heated by the transparent photothermal substrate.
  • a plasmonic metal nanoisle which is a metal having plasmon activity, is positioned on a surface including an upper surface and a side surface of each transparent nano pillar that forms an array of transparent nano pillars, whereby It is a PCR device based on the plasmonic photothermal effect in which light energy is strongly absorbed and the absorbed light energy is released as thermal energy.
  • FIG. 1 is a cross-sectional view illustrating a transparent light-heat substrate 1000 in a PCR device according to an embodiment of the present invention.
  • the transparent light-heat substrate 1000 is transparent nanoparticles spaced apart from each other.
  • the pillar 110 includes a transparent plate 100 on which an array is formed, and plasmonic metal nano islands 210 and 220 positioned on a surface including an upper surface and a side surface of the nano pillar 110.
  • the transparent light-heat substrate 1000 is a metal nano island 210 located on the top surface of each nano pillar 110, and a metal located on the side of each nano pillar 110.
  • the metal nano islands 230 may be located on the transparent plate surface between the nano pillars.
  • the transparent photothermal substrate 1000 is a plasmonic metal nano in a region including the surface of the transparent plate exposed between the top surface and the side surface and the nano pillars 110 of each nano pillar 110 forming a transparent nano pillar array. Islands 210, 220, and 230 may be located.
  • the nanoisles of the metal nanoisles 210, 220, and 230 may refer to a state in which plasmonic metals positioned in the transparent photothermal substrate 1000 are connected to each other to form a continuum.
  • the reference of the continuum may be determined based on whether the plasmonic metal is continuously connected from the upper surface (one end) of the pillar to the lower end (the other end) of the pillar in the pillar length direction of the nano pillar.
  • the plasmonic metal nanoislets may be in a state in which they are spaced apart from each other, and may be in a state of being randomly positioned but spaced apart from each other.
  • Absorption of light energy by the plasmonic metal nanoislets is based on the surface plasmon resonance (SPR) of the metal nanoislets 210, 220, and 230 located on the transparent photothermal substrate 1000, and the metal nanostructures located on one nanopillar 110.
  • SPR surface plasmon resonance
  • LSPR Localized sourface plasmon resonance
  • LSPR localized sourface plasmon resonance
  • Hot-spots between metal nanoislets may include hot-spots between metal nanoislets (between 210) located on top surfaces of adjacent nanostrips, and, together or independently, hot-spots between metal nanoislets. May comprise hot-spots between metal nanoislets (210 between belonging to 110 adjacent to each other) located on the sides of adjacent nano pillars.
  • the hot-spot between the metal nano islands is transparent with the metal nano islands 230 between the metal nano islands 220 and, together with or independently of, the metal nano islands 220 located on the side of the nano pillars 110. It may include hot spots between the metal nanoislets 230 located on the plate surface.
  • FIG. 2 is a graph illustrating absorbance of each light wavelength of a transparent photothermal substrate (GNA w / AuNIs of FIG. 2) and absorbance of each light wavelength of an Au thin film (120 nm thick; Au film of FIG. 2) according to an embodiment of the present invention. It is a figure which shows absorbance. In this case, the absorbance is calculated from transmittance (T) and reflectance (R) as shown in FIG. 2.
  • the transparent photothermal substrate of FIG. 2 is washed with a 4 inch borosilicate glass substrate using sulfuric acid and hydrogen peroxide, and then deposited with a 10 nm thick silver (Ag) film by thermal evaporation, followed by 30 at 300 ° C.
  • the annealing for minutes converts the silver thin film into silver nanoisles through solid-state dewetting, silver nanoisles as an etch mask, and dry etching of the glass substrate (reactive ion etching).
  • the remaining silver mask is wet-etched and removed with a silver etching solution to prepare a glass substrate on which the glass nano pillar array is formed.
  • gold is deposited on the glass substrate on which the glass nano pillar array is formed by thermal evaporation. It is a light-heated substrate formed with Au nanoisles on the surface of the glass substrate exposed between the upper surface and the side of the glass nano pillars and the glass nano pillars.
  • the length of the nano pillars was controlled by controlling the time of dry etching, and the size and density of the metal nano islands were controlled by controlling the deposition time of gold.
  • the nanopillars themselves are irregularly (randomly) spaced apart from each other, and the metal nanoislets formed on the nanopillars are also irregularly (randomly) positioned laterally and spaced apart from each other, thereby providing the same type of LSPR (for example, LSPR between the metal nanoislets located on one nano pillar, have different LSPR wavelengths, so that the transparent light-heat substrate can have an excellent light absorbency of 0.5 or more for the light in the visible to near infrared band, particularly in the entire visible light band. .
  • the Au thin film exhibits light absorption of 0.5 or more in the 400 to 500 nm band in which absorption due to the plasmonic characteristics of Au occurs, but the light absorption rapidly decreases as the wavelength of light exceeds 500 nm and the wavelength becomes longer. It can be seen that the light absorbance at the 600 nm wavelength is less than 0.1.
  • the transparent photothermal substrate according to the embodiment of the present invention has an excellent light absorbency of 0.5 or more with respect to light in the visible to near infrared band, especially the entire visible light band (400 to 700 nm), it is optical to biochemicals including nucleic acids.
  • the photothermal effect can be generated by simple visible light irradiation that does not cause damage, and heat can be generated more quickly by absorbing light energy with extremely good light absorption in all wavelength bands from 400 to 700 nm, and irradiate light energy of the same size. When doing so, more thermal energy can be generated.
  • 'transparent' means light, specifically visible light (400-700 nm) to near infrared light (0.78-3 ⁇ m), specifically, visible light transmittance of 90% or more. Specifically, it may mean 95% or more, and more specifically 98% or more.
  • the transparent plate may be any material as long as it is an insulating material that is transparent to light, specifically visible to near infrared rays, and more specifically to visible light.
  • the transparent plate may be a transparent inorganic material such as glass, a transparent polymer such as polymethyl methacrylate (PMMA), polydimethylsiloxane (PDMS), polyurethane acrylate (PUA), etc., but is not limited thereto. no.
  • the transparent nano pillars may be the same or different materials from the transparent plate, and may be any material as long as the insulating material is transparent to light, specifically visible light to near infrared light, and more specifically to visible light.
  • the nano pillars may be transparent inorganic materials such as glass, transparent polymers such as polymethyl methacrylate (PMMA), polydimethylsiloxane (PDMS), polyurethane acrylate (PUA), etc., but are not limited thereto. no.
  • the average diameter of the nano pillars constituting the nano pillar array is 50 to 1000 nm, specifically 100 to 500 nm, more specifically 100 to 300 nm, and the aspect ratio obtained by dividing the average length of the nano pillars by the average diameter is 0.1 to 10, specifically 1 to 10 , More specifically, 1.5 to 7, even more specifically 1.5 to 4.
  • the average diameters and aspect ratios of these nano-pillars are 400 ⁇ 700nm full wavelength band because various LSPR wavelengths are formed by the arrangement of the large size distribution of metal nano islands and irregular (random) metal nano islands even in the same type of LSPR.
  • It has a size and aspect ratio capable of exhibiting a high light absorption of 0.55 or more, and at the same time, it can secure excellent mechanical (physical) stability, and can generate a large amount of heat by the photothermal effect, and the heat generated can be rapidly Size and aspect ratio that can be conducted to, but the present invention is not necessarily limited thereto.
  • the coverage which is the ratio of the area covered by one surface by the nano pillar array in an area of one surface, is 0.10 to 0.90, specifically 0.40 to 0.85, more specifically 0.50 to May be 0.85.
  • the ratio (coverage) of the area covered by one side of the transparent plate by the nano-pillar array affects the heat generated per unit area of the transparent photothermal substrate, and the above-mentioned coverage is uniform even in a large-sized transparent photothermal substrate of up to 4 inches. Coverage where heating or temperature changes of a fluid may occur, but the invention is not necessarily limited thereto.
  • the metal of the metal nanoisomer may be a metal having plasmon activity.
  • the metal of the metal nano island may be noble metals such as gold, platinum, silver, copper, nickel, aluminum, and the like, and may be gold in terms of biocompatibility, but the present invention is necessarily limited to gold. It doesn't happen.
  • the nano islands (210 of FIG. 1) positioned on the top surface of the nano pillars may have a shape corresponding to the top surface (the shape of the top surface) of the nano pillars.
  • the nanoislets located on the top surface of the nano pillars may have a shape and size corresponding to the shape and size (diameter) of the top surface of the nano pillars and may cover the top surface of the nano pillars.
  • nanosomes 210 may be disc shaped or cut particulates.
  • the side surfaces thereof may have convex curvatures.
  • the surface except the cut surface may have a smoothly curved shape, and may be pressed in parallel with the top surface of the nano pillars, but It is not limited to this.
  • the thickness of the nano islands 210 located on the top surface of the nano pillars may be 10 to 50 nm, specifically 10 to 40 nm, but is not limited thereto.
  • the nano islands 220 located on the side of the nano pillars or the nano islands 230 located on the surface of the transparent plate between the nano pillars may be circular, ellipse or irregular shape, and the metal nano islands 220 and 230.
  • the metal nano islands 220 and 230 may have an average diameter of 5 to 100 nm, specifically 5 to 50 nm, more specifically 5 to 30 nm, and an average of 4 to 10 metal nanos in the length direction of the nanopillars.
  • the islands may be spaced apart.
  • FIG. 3 is a scanning electron microscope photograph of the upper part of the yarn-made transparent photothermal substrate described above based on FIG. 2
  • FIG. 4 is a scan electron of the side of the yarn-made transparent photothermal substrate described above based on FIG. 2. Photomicrograph.
  • the transparent nano-columns are irregularly arranged in the prepared transparent light-heat substrate to form a nano-column array, the average diameter of the transparent nano-columns was 100 nm, the average height 180 nm The surface fill factor was about 0.55.
  • the metal nanoislets located on the top surface of the nano pillars have a size (diameter) and a shape corresponding to the top surfaces of the nano pillars on which the nano islands are located, and have a disk shape having a thickness of 30 nm.
  • the metal nanoislets located on the surface except for the upper surface of the nano-columns are 50 nm in size, 10 nm or less in interval, and are spaced apart from each other, it can be seen that they are located at random.
  • the plasmonic metal nano islands 210, 220, and 230 may be cut particles, specifically spherical shapes, and cut portions may form an interface with the nano pillars 110 or the transparent plate 100.
  • the light source 2000 may be positioned under the transparent light-heat substrate 1000 to irradiate light to the nano-pillar array where the metal nano-isles of the transparent light-heat substrate 1000 are located.
  • the light of the light source may be visible light or near infrared light.
  • the visible light may be light belonging to the 400 to 700 nm band, and the near infrared ray may be light belonging to the 0.78 to 3 ⁇ m band.
  • the visible light does not mean only white light, but may include red light, green light, blue light, or a combination thereof. That is, the light source may include a red light source, a green light source, a blue light source, or a combination thereof including a white light source.
  • the transparent light-heat substrate 1000 may have an extremely high light absorbance of 0.5, substantially 0.55 or more in the entire visible light band (400 to 700 nm).
  • the light source is a white light source so that more heat can be generated at a faster time.
  • the white light source may be a halogen lamp, a xenon lamp, a white LED, or the like, but is not limited thereto.
  • the white light (visible light) from which the ultraviolet light generated from the light source is removed may be irradiated using a filter or the like.
  • the chamber 3000 may be positioned above the transparent photothermal substrate 1000, and the chamber 3000 may have an inner space partitioned by a lower surface and a side surface thereof. Fluid may be retained in the interior space.
  • the inner space of the chamber is an area in which a reaction occurs as a receiving space in which a fluid for PCR is accommodated.
  • a single chamber 3000 is provided on the transparent photothermal substrate 1000, but two or more chambers 3000 may be provided on the transparent photothermal substrate 1000 to be spaced apart from each other.
  • the chambers may be retained with the same or different fluids.
  • the chamber may also be chamfered into the wells by partitioning the space in which the fluid containing the analyte (such as biochemicals) is held.
  • the shape of the chamber 3000 may be a circular or square to octagonal polygonal shape, and the diameter may be a few millimeters to several centimeters or may be a fine chamber (fine well) having a diameter of 1000 ⁇ m or less.
  • the fluid may be a solution (including a buffer solution) containing a target nucleic acid, a nucleic acid polymerase, and a primer pair capable of amplifying the target nucleic acid, but is not necessarily limited thereto. It is sufficient if it is a composition to become.
  • the target nucleic acid means all nucleic acids that can be amplified by an amplification reaction such as PCR.
  • the target nucleic acid may be a nucleic acid such as DNA, RNA, cDNA, or the like that contains one or a plurality of base mutation sites.
  • FIG. 6 is a cross-sectional view showing another example of the transparent light-heat substrate 1000 according to an embodiment of the present invention.
  • the transparent light-heat substrate 1000 may be a plasmonic metal nano-island. It may further include a heat dissipation layer 300 covering the nano pillars (110, 220) are located.
  • the heat dissipation layer 300 may serve to transfer heat generated by the plasmonic photothermal effect to the chamber more quickly, and may also play a role of neutralizing surface charges.
  • the heat dissipation layer 300 may be a material having a similar or higher thermal conductivity as compared with the thermal conductivity of the transparent plate.
  • the heat dissipation layer 300 may be an inorganic material such as a-Si, SiO 2 , HSQ (Hydrogen silsesquioxane) or a polymer such as PDMS (Polydimethylsiloxane), the thickness of the heat dissipation layer may be 1nm to 100 ⁇ m, It is not limited to this.
  • the heat dissipation layer 300 illustrates an example in which all of the nano pillar arrays are embedded in the heat dissipation layer 300, but the present disclosure is not limited thereto, and the heat dissipation layer may have a thin film of several to several tens of nanometers in which unevenness by the nano pillars is maintained. Of course, it may be provided.
  • FIG. 7 is a cross-sectional view illustrating the transparent photothermal substrate 1000 and the chamber 3000 in one embodiment of the present invention.
  • the chamber 3000 is positioned to be in contact with the metal nanoisle 210 positioned on the upper surface of the nano pillars 110 to surround the top plate and the nano pillar array covering the nano pillar array. Extending from the top plate, one end may include a side portion in contact with the transparent plate.
  • An empty space between the nano pillars 110 on which the metal nano-isles are formed may correspond to an internal space in which the fluid is held in the chamber 3000, and also for injecting and venting the fluid into the edge region of the chamber 3000.
  • the through hole may be further provided.
  • the metal nano islands generating the plasmonic photothermal effect may directly contact the fluid.
  • the heat generated by the light can directly heat the fluid, and together with this, it is possible to control the temperature of the fluid more quickly and homogeneously, and also, the injected fluid is controlled to the overall temperature profile The temperature can be controlled to be very precise.
  • the material of the chamber 3000 shown in the example of FIG. 5 or 7 does not react with the nucleic acid, and is not particularly limited as long as it is a transparent insulating material.
  • the chamber is a transparent inorganic material such as glass, polymethyl methacrylate (PMMA), polydimethylsiloxane (PDMS), polyurethane (PU), polypropylene (PP), polyurethane acrylate (PUA) and the like. It may be a transparent polymer, but is not necessarily limited thereto.
  • Polymerase chain reaction apparatus may further include a temperature sensor for measuring the temperature of the space in which the fluid is held in the photothermal substrate or chamber.
  • the temperature sensor may be any device capable of measuring the temperature of the accommodation space in the chamber, such as a thermographic camera and a thermocouple.
  • the temperature sensor may be unnecessary during PCR, but may be required when setting the values of the control factors of the light source to meet the set temperature profile.
  • the polymerase chain reaction apparatus may further include a light irradiation control unit for controlling the light source, wherein the light irradiation control unit includes at least one factor selected from at least light intensity, light irradiation time, and light irradiation period ( factor) can be controlled.
  • a light irradiation control unit for controlling the light source, wherein the light irradiation control unit includes at least one factor selected from at least light intensity, light irradiation time, and light irradiation period ( factor) can be controlled.
  • the light irradiation controller may control the light source to match the preset temperature profile, and control at least one factor selected from at least the light intensity, the light irradiation time, and the irradiation period of the light to correspond to the preset temperature profile. can do.
  • the light irradiation control unit receives at least one factor selected from at least one of light intensity, light irradiation time, and light irradiation period to meet a preset temperature profile based on the input of the temperature sensor. Of course it can be controlled.
  • Control of the light irradiation time may include control of the irradiation type such as pulse irradiation or continuous irradiation.
  • Control of the irradiation period of light may include on / off control of light, and in the case of pulse irradiation may include control of the width of the pulse and the interval between pulses.
  • the intensity of the light may include control of the intensity (constant or varying intensity) of light over time, and the maximum magnitude (intensity) and minimum magnitude (intensity) (including zero) constituting the pulse in the case of pulse irradiation.
  • the intensity of the light can be controlled by the voltage or current applied to the light source.
  • the temperature profile according to time is a preset temperature profile, and the control value of one or more factors selected from the light intensity, light irradiation time, and light irradiation period by the previous experiment is applied to the light irradiation control unit so as to correspond to the corresponding temperature profile. It may be in an input state. Alternatively, at least one factor selected from light intensity, light irradiation time, and light irradiation period may be controlled to receive the output of the temperature sensor so as to correspond to a preset temperature profile.
  • the cycle may be repeated by increasing the temperature from the coupling temperature to the denaturation temperature and the temperature reduction from the modification temperature to the coupling temperature.
  • the temperature rising rate value, the temperature reduction rate value, the bonding temperature value, the denaturation temperature value, the holding time at the bonding temperature (including 0), the holding time at the modification temperature, the number of cycle repetitions, etc. may be predetermined temperature profiles. It goes without saying that the invention is not limited by the specific conditions of the temperature profile.
  • Polymerase chain reaction apparatus may further include a detector for detecting the Raman signal generated in the fluid. That is, by further including a detector for detecting the Raman signal, it is possible to analyze the material information and the degree of amplification of the nucleic acid amplified by surface enhanced Raman scattering spectroscopy (SERS) in real time.
  • SERS surface enhanced Raman scattering spectroscopy
  • the real-time SERS analysis that can be performed with nucleic acid amplification is that the above-mentioned transparent photothermal substrate is a substrate having a hot spot capable of augmenting Raman signal, and the wavelength of LSPR present in the transparent photothermal substrate is 400-700 nm. It is based on the fact that it exists over a wide wavelength band, especially in the case of a chamber as shown in FIG. 7, in which the fluid can directly contact the hot spot, thereby enabling a very strong signal augmentation.
  • the fluid may further include a Raman probe coupled to the target nucleic acid along with a primer pair capable of amplifying the target nucleic acid, the nucleic acid polymerase and the target nucleic acid.
  • a Raman probe coupled to the target nucleic acid along with a primer pair capable of amplifying the target nucleic acid, the nucleic acid polymerase and the target nucleic acid.
  • SERS analysis can be performed in real time during nucleic acid amplification, or alternatively can be performed after nucleic acid amplification is complete.
  • FIG. 8 is a structure similar to that of FIG. 5, in which a PDMS chamber is formed on the above-described photothermal substrate based on FIG. 2, and an optical photograph and a temperature mapping result of a PCR device manufactured by placing a white LED light source 3W under the photothermal substrate.
  • the light source is turned off, the temperature inside the chamber is the same as the surroundings, but when the light source is turned on, it can be confirmed that the inside of the chamber is uniformly heated.
  • FIG. 9 is a diagram illustrating a measurement of a temperature cycle characteristic according to control of light irradiation in the PCR apparatus illustrated in FIG. 8, wherein the GNA w / AuNIs illustrated in black in FIG. 9 are the results of the PCR apparatus illustrated in FIG. 8.
  • the Au film shown in gray is a glass substrate in which an Au thin film (120 nm thick) is formed in FIG. 2 as a transparent photothermal substrate, instead of a transparent photothermal substrate in which a nano pillar array in which metal nanoislets are located is formed in the PCR apparatus illustrated in FIG. 8. It is the result of the apparatus used.
  • FIG. 8 is a diagram illustrating a measurement of a temperature cycle characteristic according to control of light irradiation in the PCR apparatus illustrated in FIG. 8, wherein the GNA w / AuNIs illustrated in black in FIG. 9 are the results of the PCR apparatus illustrated in FIG. 8.
  • the Au film shown in gray is a glass substrate in which an Au thin film (120 nm thick
  • FIG. 10 is a view illustrating a preset temperature profile (bonding temperature (55 ° C)-> denaturation temperature (93 ° C)-> cycle of bonding temperature (55 ° C) in FIG. 9 and control conditions of a light source implementing the temperature profile.
  • the pulsed white light was irradiated by a white LED light source
  • the voltage of the light source was 24V
  • the pulse width t1 was 4 sec
  • the interval between pulses t2 was 3 sec.
  • the photothermal substrate may be manufactured through a simple process such as deposition, annealing, dry etching, wet etching, and deposition, thereby providing a PCR device according to an embodiment of the present invention. It can be seen that it can be mass-produced at low cost, and as shown in FIG.
  • the light, heat, and light chambers have a small, light and simple device structure, which can be carried and moved, and control values are provided in the controller to meet a preset temperature profile.
  • control values are provided in the controller to meet a preset temperature profile.
  • FIG. 11 is a diagram illustrating amplification results of nucleic acids using the apparatus shown in FIG. 8 (Plasmonic PCR in FIG. 11).
  • FIG. 11 illustrates a commercial thermal cycler using a Peltier metal block for comparison. The amplification results are shown together.
  • FIG. 11 shows a template ⁇ -DNA (template ⁇ -DNA, CATCGTCTGCCTGTCATGGGCTGTTAATCATTACCGTGATAACGCCATTACCTACAAAGCCCAGCGCGACAAAAATGCCAGAGAACTGAAGCTGGCGA), Z-Taq DNA polymerase (Z-Taq DNA polymerase), Z-AaqT buffer, TakaZ-AqT Inc.
  • template ⁇ -DNA template ⁇ -DNA
  • Z-Taq DNA polymerase Z-Taq DNA polymerase
  • Z-AaqT buffer TakaZ-AqT Inc.
  • PCR composition is 0.2 ⁇ L Z-Taq DNA polymerase, 2 ⁇ L Z-Taq buffer, 1.6 ⁇ L nucleoside triphosphate, 1.8 ⁇ L forward primer, 1.8 ⁇ L It was prepared by mixing the reverse primer, 1 ⁇ L template ⁇ -DNA (1 ng / ⁇ L), 12.4 ⁇ L distilled water, 20 ⁇ L of the PCR composition and 30 ⁇ L mineral oil was sequentially added to the chamber of the PCR device according to Figure 8, Similar to that described above based on FIGS. 9 and 10 , PCR was performed to ensure that the light-heat temperature cycle is repeated.
  • the intensity of the amplified DNA is the value by electrophoresis
  • cycle number is the number of repetition of the temperature cycle performed for amplification
  • PCR time (s) is required when the number of temperature cycles are repeated Mean time (sec).
  • FIG. 12 is a Raman probe for introducing a PCR fluid (the same as described above in FIG. 11) further including SYBR green into the apparatus shown in FIG. 8 and amplifying the nucleic acid by repeating thermal cycles. As shown in FIG. 2, the 633 nm laser is irradiated to the fluid in the chamber and the SERS signal emitted from the DNA is detected through a spectrometer.
  • nucleic acid detection by PCR and SERS can be performed simultaneously, it can be seen that the information and amplification degree of DNA amplified by the SERS measurement can be detected in 'real time'.
  • the 633 nm laser was irradiated with the excitation light while the LED white light source was turned off.
  • the light source when the light source generates the white light including the wavelength of the excitation light, only the light emitted from the light source is irradiated without a separate laser irradiation.
  • the SERS measurement can also be performed.
  • the present invention includes a PCR method using the above-described PCR apparatus.
  • PCR method is a polymerase chain reaction method using the above-described polymerase chain reaction device, a) a step of injecting a fluid (PCR fluid) for the polymerase chain reaction to the chamber; And b) irradiating the transparent photothermal substrate with light generated from the light source such that the fluid conforms to the temperature profile over time.
  • a fluid PCR fluid
  • irradiating the transparent photothermal substrate with light generated from the light source such that the fluid conforms to the temperature profile over time.
  • the temperature can be controlled.
  • the temperature profile over time may be a profile in which the cycle is repeated by increasing the temperature from the annealing temperature to the denaturation temperature and the temperature reduction from the denaturation temperature to the binding temperature.
  • the binding temperature may be 50 to 60 ° C.
  • the denaturation temperature may be 90 to 98 ° C.
  • the target nucleic acid, the nucleic acid polymerase, and the primer pair capable of amplifying the target nucleic acid are nucleic acids to be amplified. It is, of course, possible to construct a temperature profile with known bonding temperatures and denaturing temperatures.

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  • Health & Medical Sciences (AREA)
  • Clinical Laboratory Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Apparatus Associated With Microorganisms And Enzymes (AREA)

Abstract

Un appareil de réaction en chaîne de la polymérase selon la présente invention comprend : un substrat photothermique transparent comprenant une plaque transparente ayant un réseau de nano-piliers transparents agencés pour être espacés les uns des autres, et des nano-îlots métalliques plasmoniques disposés sur des surfaces comprenant des surfaces supérieures et des surfaces latérales des nano-piliers; une source de lumière disposée sous le substrat photothermique et émettant de la lumière vers les nano-îlots métalliques plasmoniques; et une chambre recevant un fluide chauffé par le substrat photothermique transparent.
PCT/KR2019/006420 2018-05-31 2019-05-29 Appareil de réaction en chaîne de la polymérase et procédé de réaction en chaîne de la polymérase l'utilisant WO2019231230A1 (fr)

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