EP2027288A1 - Chambre de réaction destinée à une rcp en temps réel comprenant des sondes de capture et permettant de détecter le produit rcp par hybridation, sans ouverture du contenant rcp - Google Patents

Chambre de réaction destinée à une rcp en temps réel comprenant des sondes de capture et permettant de détecter le produit rcp par hybridation, sans ouverture du contenant rcp

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Publication number
EP2027288A1
EP2027288A1 EP07729115A EP07729115A EP2027288A1 EP 2027288 A1 EP2027288 A1 EP 2027288A1 EP 07729115 A EP07729115 A EP 07729115A EP 07729115 A EP07729115 A EP 07729115A EP 2027288 A1 EP2027288 A1 EP 2027288A1
Authority
EP
European Patent Office
Prior art keywords
reaction chamber
chamber
pcr
capture
window
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP07729115A
Other languages
German (de)
English (en)
Inventor
José REMACLE
Isabelle Alexandre
Heinz Koehn
Martin Seippel
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Eppendorf Array Technologies SA
Original Assignee
Eppendorf Array Technologies SA
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority claimed from PCT/EP2005/012382 external-priority patent/WO2006053769A1/fr
Application filed by Eppendorf Array Technologies SA filed Critical Eppendorf Array Technologies SA
Priority to EP07729115A priority Critical patent/EP2027288A1/fr
Publication of EP2027288A1 publication Critical patent/EP2027288A1/fr
Withdrawn legal-status Critical Current

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    • B01L3/508—Containers for the purpose of retaining a material to be analysed, e.g. test tubes rigid containers not provided for above
    • B01L3/5082—Test tubes per se
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    • B01J19/00—Chemical, physical or physico-chemical processes in general; Their relevant apparatus
    • B01J19/0046—Sequential or parallel reactions, e.g. for the synthesis of polypeptides or polynucleotides; Apparatus and devices for combinatorial chemistry or for making molecular arrays
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    • B01L3/5027—Containers for the purpose of retaining a material to be analysed, e.g. test tubes with fluid transport, e.g. in multi-compartment structures by integrated microfluidic structures, i.e. dimensions of channels and chambers are such that surface tension forces are important, e.g. lab-on-a-chip
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Definitions

  • the present invention relates to a closed device for performing a polymerase chain reaction (PCR) of a nucleotide sequence together with its detection on immobilized capture molecules. More particularly, the device is useful for monitoring the amplification of the sequence in real-time.
  • PCR polymerase chain reaction
  • the present invention allows the identification and the quantification of specific genes or organisms by amplification and detection performed in a one step assay.
  • Detection and quantification of an organism, or a part of it such as a gene is best performed using the molecular amplification of the nucleotide sequence followed by its detection. Amplification of a given sequence is performed by several methods such as the polymerase chain reaction (PCR) (U.S. Pat. Nos. 4,683,195 and 4,683,202), ligase chain reaction (LCR) (Wu and Wallace, Genomics, Vol. 4, p.560, 1989) or the Cycling Probe Reaction (CPR) (U.S. Pat. No. 5,011,769) which are the most common.
  • PCR polymerase chain reaction
  • LCR ligase chain reaction
  • CPR Cycling Probe Reaction
  • PCR is the most commonly used method of amplification. PCR uses two oligonucleotide primers, an agent for polymerization, a target nucleic acid template. The successive cycles of denaturation of nucleic acid, annealing and extension of the primers produce large number of copies of a particular nucleic acid segment. Segments of genomic DNA can be amplified up to 10 million fold with very high specificity and fidelity when using optimized conditions.
  • the PCR are usually performed in a single tubes and in wells being part of a 96-wells or 384 well plate format and are thereafter analyzed for the presence of the amplified sequence known as amplicons.
  • One particular way to detect the presence of a given target nucleic acid sequence, and thus of a particular organism, is to monitor the appearance of amplicons during the PCR cycles.
  • the method is called real time PCR.
  • the method gives the possibility of quantifying the amplified sequence as the cycles progress, and to calculate the amount of the sequence in the original sample.
  • the method uses a homogeneous format, and the PCR and the detection are performed within one tube. Performing both amplification and detection in a closed chamber lowers the contamination risk caused by opening the tubes in conventional post-PCR detection methods.
  • One way to assay for the presence of the amplicons is to take advantage of certain intercalating dyes, the fluorescence of which increases, or changes its parameters, when the dye is intercalated into double stranded DNA.
  • One to the most commonly used dye is SYBR green.
  • the method assays for the amount of double stranded DNA, mainly the amplicons present in the solution.
  • U.S. Pat. No. 4,683,195 and U.S. Pat. No. 6,171,785 also use the introduction of detectable DNA binding agents (such as ethidium bromide) into the amplification reaction, which agents produce a detectable signal in the PCR solution that is enhanced upon binding double-stranded DNA.
  • beacons are structurally similar to the tradition single strand hybridization probe except that the ends of the beacon contain equal length self-complementary segments, which, in free state, will bond to each other forming a loop terminated by a blunt end stem.
  • the ends of the stem have a fluorescer attached to one side and a quencher attached to the other side, so that it is self quenching in the unbound state.
  • the fluorophor and quencher become separated in space allowing the sample to fluoresce.
  • the TaqMan probes are among the most popular specific methods of detection in real time and are commercially available.
  • the TaqMan probe contains both a fluorescer and a quencher in close proximity to one another which inhibits fluorescence in the probe hybridized to the target amplicon or in excess probes in solution.
  • the fluorochrome is released from the vicinity of the quencher by the digestion of the probes during the copying of the amplicon strand by the Taq polymerase having a 5 '-3' exonuclease activity. They provide a detectable molecule that accumulates in the solution during the successive cycles.
  • 5,716,784 provides an alternative method based on the use of two complementary probes, a first, analytical probe being labeled at its 5' terminus with an energy transfer donor fiuorophore, and a second, detection probe being labeled at its 3' terminus with an energy transfer acceptor fiuorophore.
  • Quantitative detection of oligonucleotide analytical probe hybridized in solution to the oligonucleotide detection probe provides a measure of the amount of oligonucleotide analytical probe used up in the amplification of the target nucleic acid sequence and thus provides a measure of amount of target nucleic acid sequence amplified in the PCR replication procedure.
  • the quantitative detection of the analytical probe involves spectrophotometrical energy transfer detection in solution.
  • U.S. Pat. No. 5,928,907 describes an apparatus for monitoring the formation of a nucleic acid amplification reaction product in real time that uses an optic fiber focused in the volume of the sample.
  • the fluorescence is usually detected in the solution trough the tip or the bottom of the tubes or the wells.
  • WO 04/101733 discloses a wash- free PCR amplification tube for direct gene detection.
  • a molecular beacon is immobilized inside the reaction tube that is designed for the PCR purpose.
  • the PCR tube also comprises a transparent window at the section where the molecular beacon is fixed inside the PCR tube.
  • the immobilized probe comprises a fluorescer and a quencher.
  • the quencher is positioned at the free end of the probe.
  • the quencher is released from the vicinity of the fluorescer by the digestion of the immobilized probes during the copying of the amplicon strand by the Taq polymerase having a 5 '-3' exonuclease activity. They provide a detectable molecule that accumulates on the support during the successive cycles.
  • the present invention aims to provide a device for a method that has the advantages of the real time PCR methods described here above using specific probes for the detection, but that overcomes the limitations of single (or very few) detection per assay and/or the complexity of the design of labeled probes having both specificity and physico-chemical constraints such as quenching or FRET.
  • the aim of the invention is to provide a device for monitoring a PCR in real-time, in a heterogeneous system, obviating the shortcomings associated with prior art methods.
  • the device is used for a very large number of applications and targets to be detected and offers the possibility to monitor in real time the amplification of a large number of target sequences This in turn makes it possible to detect and quantify, in a single assay, the presence of multiple organisms or genes in the sample and is not limited by the number of fluorochromes, as is the real-time PCR with the detection in solution.
  • the device comprises a reaction chamber for real-time PCR configured for containing a PCR solution, said chamber having a capture molecule immobilized on the chamber inner surface, said surface being configured to be in intermittent contact with the PCR solution, and a window permitting detection of a signal from said inner surface by a reader located outside the chamber, and wherein the immobilized capture molecule is not labeled.
  • the specificity of the detection is given by the hybridization of amplicon on the immobilized capture molecules. Another feature of the invention is that the capture molecules are not taking part in the PCR reaction and thus do not interfere with the PCR happening in the solution.
  • Figure 1 is a representation of a preferred device of the invention having a reaction chamber (1) with one compartment.
  • the device is used in the following method.
  • a solution (3) containing the nucleotide molecules and reagents for amplification and labeling are introduced into the reaction chamber (1).
  • Capture molecules (4) are immobilized at the bottom of the reaction chamber (1).
  • the reaction chamber is sealed with a lid (2).
  • the PCR amplification is performed in the reaction chamber (1), which is in contact with a temperature regulation device (5).
  • the labeled target molecules are present both in solution and hybridized on capture molecule (4).
  • FIG. 4 is a representation of a preferred device of the invention having a reaction chamber (1) with one compartment. The device is used in the following method.
  • a solution (3) containing the nucleotide molecules and reagents for amplification and labeling are introduced into the reaction chamber (1).
  • the reaction chamber is sealed with a lid (2) having fixed upon their surface capture molecules (4).
  • the PCR amplification is performed in the reaction chamber (1), which is in contact with a temperature regulation device (5).
  • FIG. 3 is a representation of a preferred device of the invention having a reaction chamber (1) with two compartments.
  • the device is preferably part of a disk support to allow an easy centrifugation of the device (fig.
  • step 1 a solution (3) containing the nucleotide molecules and reagents for amplification and labeling are introduced into a first compartment of the reaction chamber (1). Capture molecules (4) are immobilized at the top of the second compartment of the reaction chamber (1).
  • step 2 the reaction chamber is sealed with a lid (2) and the PCR amplification is performed in the first compartment of the reaction chamber (1) which is in contact with a temperature regulation device (5).
  • step 3 the reaction chamber (1) is centrifuged and flipped in order to contact the solution containing the labeled target molecules with the capture molecules (4) immobilized in the second compartment.
  • step 4 the chamber (1) is inverted back, and the bound labeled target molecules are measured through a window (7) by the detector (6).
  • Figure 4 is a representation of an alternative device of the invention, having a reaction chamber (1) with two compartments.
  • the principle of use of the device is the same as as provided in figure 3.
  • the first compartment is a micro tube and the second compartment, carrying the capture molecules (4), is a flat channel that is connected to the microtube.
  • FIG. 5 is a representation of a preferred device of the invention having a reaction chamber (1) with three compartments: two compartments separated by a third compartment, which is a channel bearing the capture molecules (4).
  • a solution (3) containing the nucleotide molecules and reagents for amplification and labeling are introduced into a first compartment of the reaction chamber (1).
  • the solution (3) diffuses to the second and third compartments by capillarity.
  • the first compartment is sealed with a lid (2) and the PCR amplification is performed in the reaction chamber (1), which is in contact with a temperature regulation device (5).
  • the solution is moved over the capture molecules (4) in order to increase the speed of the binding reaction of the labeled target nucleotide molecule on its capture molecule. This is obtained by rotating, translating or moving up and down the reaction chamber (1) or by increasing-decreasing the pressure in the chamber.
  • the reaction chamber (1) is centrifuged in order to remove the solution containing the labeled target molecules from the surface carrying the capture molecules (4), and the bound labeled target molecules are measured through a window (7) by the detector (6).
  • nucleic acid oligonucleotide
  • array oligonucleotide
  • probe target nucleic acid
  • binding substantially “hybridising specifically to”, “background”, and “quantifying” are as described in the international patent application WO97/27317, incorporated herein by reference.
  • nucleotide triphosphate As described in the document WO00/72018, incorporated herein by references.
  • the terms “Homologous sequences” and “consensus sequence” are described in the European patent application WOO 1/77372, incorporated herein by reference.
  • the term “homology” is intended to mean the degree of identity of one polynucleotide sequence to another polynucleotide sequence. There may be complete homology (i.e. 100% identity) between two or more polynucleotides. The degree of homology is calculated after alignment of the sequence and may be determined by any method well known to a person skilled in the art.
  • capture molecule refers to a molecule, or complex or combination of molecules, that is capable of specifically binding to one target molecule, or to a family of target molecules, or to one or more member (s) of a plurality of target molecules, or portion(s) thereof.
  • the capture molecules are preferably nucleic acids, which are either synthesized chemically in situ on the surface of the support or synthesized ex situ and subsequently affixed to the support. Nucleic acid binding is achieved via base pairing between two polynucleotides, one being the immobilized capture molecule and the other one the target to be detected.
  • Capture molecules also comprise derivatives of the nucleic acid, such as PNA or LNA, as long as they can bind specifically the target polynucleotide molecule.
  • single capture molecule species is a composition of related polynucleotides for the detection of a given sequence by base pairing hybridization or by molecular recognition between polypeptides or proteins. Polynucleotides are synthesized either chemically or enzymatically, or isolated from samples, but the synthesis or isolation is not always perfect and the capture molecule is contaminated with other related molecules, like shorter polynucleotides.
  • the essential characteristic of one capture species for the invention is that the overall species can be used for capture of a given target nucleotide molecule.
  • polynucleotide sequences that are complementary to one or more genes or to the genome sequence refers to polynucleotides that are capable of hybridizing under stringent conditions to at least part of the nucleotide sequence of said genes or genome or copy thereof.
  • Polynucleotides also include oligonucleotides (comprising more than 2 bases but fewer than 100 bases), which can be used under particular conditions.
  • Such hybridizable polynucleotides will typically exhibit at least about 75% sequence identity at the nucleotide level to said genes or genome, preferably about 80% or 95% sequence identity or preferably more than 95% nucleotide sequence identity to said genes or genome. They are composed of either small sequences typically 15-30 bases long, or longer ones being between 30 and 100 or even longer, between 100 and 800 bases long, depending on the specificity and sensitivity requirements for the assay.
  • Micro-array means a support on which multiple capture molecules are immobilized in order to be able to bind to the given specific target molecule.
  • the micro-array is preferentially composed of capture molecules present at specifically localized areas on the surface or within the support or on the substrate covering the support.
  • a specifically localized area is the area of the surface that contains bound capture molecules specific for a determined target molecule.
  • the specific localized area is either known from the method that was used in building the micro-array, or is defined during or after the detection.
  • a spot is the area where specific target molecules are fixed on their capture molecules and seen by the detector.
  • the micro-array may also contain detection controls which are labeled.
  • micro-arrays of capture molecules are also provided on different supports, as long as the different supports contain specific capture molecules and may be distinguished from each other in order to be able to quantify the specific target molecules. This can be achieved by using a mixture of beads having particular features and being able to be distinguished from each other in order to quantify the bound molecules. One bead or a population of beads is then considered as a spot having a capture molecule specific of one target molecule.
  • the "amplicon” of the invention means target nucleotide molecules being the result of PCR amplification of a nucleotide molecule present in a biological material.
  • "Intermittent contact” means to be physically in contact or not according to some time frame.
  • the PCR solution is in intermittent contact with the capture molecule, means the PCR solution is moved or displaced from the surface having fixed the capture molecules for a given time period (non contact) and then it is moved back to its original position (contact).
  • Preferably more than 95% and preferably more than 99% of the PCR solution is moved or displaced in the reaction chamber.
  • the PCR solution is preferably displaced by gravity drain resulting from a change in orientation of the reaction chamber, preferably rotation, translation, or lateral movement of the reaction chamber.
  • the reaction chamber according to the invention contains a window on which multiple capture molecules are fixed in the form of a micro-array having at least 4 different localized areas.
  • the amplicons produced during the PCR cycles are labeled during their synthesis, and they are detected through the window of the reaction chamber when bound to the capture molecules immobilized on the chamber surface.
  • the chamber is sealable with a lid and the evaporation of the liquid present in the chamber is less than 10% preferably less than 1%, after 35 PCR cycles.
  • the reaction chamber is made of solid material resistant to 90 0 C preferably to 95°C.
  • the surface of the window is maintained flat at temperatures higher than 85°C, preferably higher than 95°C.
  • the hybridized amplicons have to be detected by a detector and preferably the different localized area that contain different capture molecules have to show the same signal intensity if bound with the same amount of targets.
  • a preferred embodiment of the reaction chamber is one having a flatness tolerance of the different detected localized areas of the window of less than 100 microns, preferably less than 25 microns.
  • the light transmittance of the window at the wavelength used for the detection is higher than 80%, preferably higher than 90%.
  • the signal detected trough the window resulting from the binding of the amplicons to the immobilized capture molecules is at least 2 times, preferably at least 5 times, more preferably at least 10 times higher than the signal obtained without binding like in the absence of amplicons or in conditions in which no binding can take place.
  • the chamber is thermoregulated with a temperature regulation device located outside the chamber.
  • the temperature regulation device is not present at the window location, to allow the measurement of the bound amplicons.
  • the micro-array comprises more than 10 different capture molecules (20), preferably more than 20, more preferably more than 50. They are preferably polynucleotide molecules. Also, the capture molecules preferably have an amplicon-specific binding sequence (capture portion), and a spacer portion bound to the chamber surface.
  • the immobilized capture molecule is preferably a polynucleotide having a capture portion, and a spacer portion of at least 20 nucleotides, preferably at least 50, more preferably more than 90 nucleotides.
  • the capture molecules are fixed on a surface having sub- compartments.
  • each compartment contains different capture molecules.
  • each compartment contains the same capture molecules.
  • the chamber comprises at least 4 different capture molecules that are physically separated in sub- compartments.
  • the capture molecule is not in fiuidic contact with the solution containing the amplicons during the PCR.
  • the capture molecule is in fiuidic contact with the solution containing the amplicons during the PCR.
  • the measurement of the bound labeled amplicons is performed in the absence of liquid.
  • the absence of liquid is obtained by gravity drain, such as resulting from changing the orientation of the reaction chamber.
  • changing the orientation of the reaction chamber by a method selected from the group consisting of: rotation, translation, or lateral movement of the reaction chamber.
  • the reaction chamber has two compartments that are in fiuidic contact, one for the PCR and the other one containing the window for detection of the bound amplicons.
  • the reaction chamber has three compartments being in fluidic contact, two for the PCR and the other one containing the window for detection of the bound amplicons.
  • At least one compartment of the reaction chamber (1) or the chamber itself has a shape selected from the group consisting of: a tube, a well, a cavity, and a reservoir.
  • the reaction chamber or a compartment of the chamber is closed by a lid.
  • the lid serves as window for the detection of the bound amplicons.
  • the lid comprises or is made of a material selected from the group consisting of glass, metal, polymer (preferably thermo -resistant having low self- fluorescence) or any other material used in the micro-array technology (preferably activated glass bearing aldehyde or epoxide or acrylate groups), said lid comprising also specific coatings, markers or devices (bar codes, electronic devices, etc.) for improving the assay.
  • the support bearing the capture molecules has a 3 dimensional porous structure.
  • Conventional glass slides have less than 60% silicon dioxide on their surface. This inherently limits the amount of chemical bonding available on the surface.
  • Porous material exhibits an increased loading capacity of capture molecules.
  • Typical porous supports include gel pads, fused- fiber matrix, and fibrous polymer matrix. The capture molecules can be immobilized entirely in the porous material, or on a layer of porous material mounted on top of a flat surface such as glass, plastic, or metal.
  • the polymer material of the lid is selected from the group consisting of: polycarbonate (PC), polyethylene (PE), Cycloolefin copolymer (COC), cyclic olefin polymer (COP) or a mixture thereof.
  • PC polycarbonate
  • PE polyethylene
  • COC Cycloolefin copolymer
  • COP cyclic olefin polymer
  • a preferred COP product is Zeonex® because of its excellent optical properties, chemical resistance, thermal stability, and low fluorescence.
  • the lid is thermo-resistant and is maintained flat at a temperature higher than 85°C.
  • the light transmittance of the lid at the wavelength used for the detection is higher than 80% and even higher than 90%.
  • the reaction chambers or compartments of the chamber are the wells of a multiwell plate that are separated from each other by a pitch of 4.5 mm or a multiple thereof.
  • the reaction chambers or compartments of the chamber are part of a support being a multiwell plate having at least 2, preferably at least 8, more preferably at least 24 , still more preferably at least 96, and even more preferably at least 384 chambers.
  • the chamber is made of polymer selected from the group consisting of: polycarbonate (PC), polyethylene (PE), Cycloolefm copolymer (COC), cyclic olefin polymer (COP) or a mixture thereof.
  • PC polycarbonate
  • PE polyethylene
  • COC Cycloolefm copolymer
  • COP cyclic olefin polymer
  • the cycloolefin copolymer (COC) or cyclic olefin polymer (COP) is Zeonex® product.
  • the chamber and/or the window is made of Zeonex®, which has a light transmittance higher than 90% (http://www.zeonchemicals.com).
  • the polynucleotides that used as capture molecule are between 10 and 1000 nucleotides long, preferably between 100 and 400 nucleotides long.
  • the polynucleotide capture molecules contain a spacer portion according to the patent WOO 177372. Specific binding of homologous sequences or SNP possibly present in the same sample, are obtained using capture molecules having a specific part of between 10 and 30 nucleotides.
  • the polynucleotides that are used as capture molecules are present on the micro-array localized area at a density superior to 10 fmoles per cm 2 , preferably more than 100 fmoles per cm 2 surface of the solid support.
  • the micro-array according to this invention contains between 4 and 100000 spots per cm 2 and preferably between 20 and 1000 spots per cm 2 . Each spot is preferably the localized area for one capture molecule. Miniaturization allows performing one assay upon a large number of surface spots (usually circular spots of about 0.1 to about 1 mm diameter). A low density array, containing 20 to 400 spots is easily obtained at low cost with pins of between 0.2 and 0.4 mm of diameter. Higher density of spots up to 1,600 spots per cm2 can be obtained by reducing the size of the spots for example between 0.1 mm and 0.2 mm diameter. Method for obtaining capture molecules of higher density have been described earlier as in US 5,445,934.
  • Miniaturization of the spot size allows for a high number of data to be obtained and analyzed simultaneously, the possibility to perform replicates and with only a small amount of biological sample being necessary for the assay.
  • Miniaturization for detection on micro-arrays is preferably associated with microfluidic substrate for separation, extraction of nucleotide molecules from a cell extract.
  • the localized area is comprised between about 10 ⁇ m 2 and about 1 mm 2 , preferably between about 1 ⁇ m 2 and about 100 ⁇ m 2 .
  • the capture molecules present on the micro-array are complementary to at least one part of the sequence of an amplified target nucleotide sequence present in solution.
  • the capture molecules comprise a nucleotide sequence that is able to specifically bind the amplified target nucleotide sequence, said specific nucleotide sequence (capture portion) is also preferably separated from the surface of the solid support by a spacer arm (spacer portion) of at least about 6.8 nm or 20 nucleotides in a double stranded form, and which has no binding affinity for the amplified target molecule.
  • the capture molecule is a single stranded polynucleotide containing a capture portion able to specifically bind the labeled target nucleotide molecule, and a spacer portion of at least 20 nucleotides, preferably more than 90 nucleotides.
  • the spacer portion can be either single or double stranded DNA.
  • the capture portion of the capture molecule is comprised between 15 and 100 nucleotides, more preferably between 15 and 35 nucleotides.
  • Detectable labels suitable for use in the present invention include any composition detectable by eletromagnetic light emission.
  • the target molecules are labeled with a fluorescent dye.
  • the fluorescent label can be incorporated into the target by enzymatic or chemical reaction. Typical enzyme reaction includes the incorporation of nucleotide analogues into the target. Alternatively, primers labeled at their 5 ' end with a fluorescent dye can be incorporated into the target.
  • Fluorochromes can also be incorporated into the targets by chemical reaction, such as the reaction of fluorescent dye bearing a N- hydroxysuccinimide (NHS) group with amines groups of the targets.
  • Useful fluorescent dyes in the present invention include cyanine dyes (Cy3, Cy5, Cy7), fluorescein, texas red, rhodamine, green fluorescent protein.
  • the excitation wavelength for cyanin 3 is comprised between 540 and 558 nm with a peak at 550 nm, and the emission wavelength is comprised between 562 and 580 nm with a peak at 570 nm.
  • the excitation wavelength for cyanin 5 is comprised between 639 and 659 nm, with a peak at 649 nm, and the emission wavelength is comprised between 665 and 685 nm with a peak at 670 nm.
  • the excitation wavelength for cyanin 7 is comprised between 733 and 753 nm with a peak at 743 nm and the emission wavelength is comprised between 757 and 777 nm with a peak at 767 nm.
  • Patents teaching the use of such labels include U.S. Patent Nos. 3,817,837; 3,850,752; 3,939,350; 3,996,345; 4,277,437; 4,275,149; and 4,366,241.
  • the fluorescent dye is cyanin 3, cyanin 5, or cyanin 7.
  • the original nucleotide molecule is not necessarily labeled before the amplification but should lead to amplified labeled target molecules during the amplification step.
  • the amplified nucleotide molecules are able to hybridize on the capture molecules after a denaturation step. As the amplified nucleotide molecules are double stranded, in theory they should reassociate in solution much faster than that they hybridise on capture molecules fixed on a solid support, where diffusion is low and the specific binding sequence is short, thus reducing even more the rate of reaction. Therefore, it was unexpected to observe a significant signal increase on the capture molecules over multiple thermal cycles after a short period of incubation time. [0072] In a particular embodiment the measurement is performed on bound target labeled molecules while they reassociate in a double stranded form in the solution during annealing and/or elongation of the thermal cycle.
  • the amplified target nucleotide molecules are of a limited length, preferably between 100 and 2000 bases, more preferably between 200 and 1500 bases, and still more preferably between 300 and 800 bases. This preferred requirement depends on the possibility to find primers to amplify the required sequences possibly present in the sample. Too long a target may reallocate faster and adopt secondary structures, which may inhibit the fixation on the capture molecules.
  • the thermal cycler is adapted to fit the support format of a 96 wells mitrotiter plate.
  • the alternative heating and cooling is preferably obtained using a peltier element or pulsed air.
  • the light beam is a laser beam, which is focused on the surface of the lid compartment in order to excite directly the fluorescent molecules.
  • the laser beam is preferably focused perpendicular to the surface of the lid.
  • the emitted light is detected in the opposite direction of the excitation laser beam.
  • the emitted light is preferably detected as a confocal light and measured after amplification by a photomultiplier.
  • the surface of the lid compartment is scanned by the laser beam in order to obtain a maximum light excitation of the bound targets.
  • the signal associated with a capture molecule on the lid compartment is quantified.
  • the preferred method is the scanning of the array(s) with a scanner, which is preferably a laser confocal scanner for the detection of fluorescent labeled targets.
  • the resolution of the image is comprised between 1 and 500 ⁇ m and preferably between 5 and 50 ⁇ m.
  • the window compartment is preferably scanned and, each localized area of the micro-array or each sub-compartment is subsequently measured.
  • the scanning of the array is performed within 1 min, more preferably within 30 sec, and still more preferably within 10 sec. If reading is repeated over multiple thermal cycles, the scan of each localized area preferably is measured at the same precise moment of a temperature step.
  • each localized area is subsequently measured can be advantageously used to monitor the hybridization kinetics of a labeled target nucleotide molecule on the same capture molecule immobilized at different localized areas of the support, which are scanned in a time dependent manner. Since the temperature is maintained constant during the measurement, the target nucleotide molecule continues to hybridize on its capture molecule during the scanning.
  • the data on the quantification of the amplified target molecules performed at different PCR cycles are processed in order to quantify the amount of nucleotide molecule present in the original solution before the amplification.
  • the amplification cycles lead to the doubling of the target sequence in each cycle when the efficiency of the amplification is maximal.
  • Quantification of the original nucleotide concentration is calculated from the extrapolation of the first cycle that gives a detectable value, or from a value crossing a fixed threshold. The concentration is then calculated from a reference curve, or from the data obtained on a standard molecule.
  • the data are processed in order to obtain a signal value for each of the localized areas.
  • the data are processed in order to obtain a signal value for each of the localized areas, and for the local background. The data are further processed by subtracting the background from the signal value for each of the localized area.
  • the quantification of the amount of nucleotide molecule is performed by comparing the signal value of the localized area with a fixed value.
  • the quantification of the amount of nucleotide molecule is performed by comparing the number of thermal cycles necessary to reach a fixed value (cycle threshold or CT) with the CT of a reference nucleotide molecule.
  • the reference nucleotide molecule is preferably amplified in the same solution and detected on the same micro-array as the target nucleotide molecule.
  • the quantification of the amount of nucleotide molecule is performed by comparing the number of thermal cycles necessary to reach a fixed value (CT) with a standard curve wherein the CTs are plotted against standard concentrations.
  • CT fixed value
  • a multiwell plate in Zeonex® having 96 wells was functionalized for the presence of aldehydes groups according to the following protocol.
  • a multiwell plate in Zeonex® having 96 wells was functionalized for the presence of aldehydes according to the method described in example 1.
  • Aminated DNA was then spotted in a micro-array pattern in the wells of the 96-wells plate derivatized with aldehyde groups.
  • the aminated capture molecules were spotted from solutions at concentrations of 3 ⁇ M.
  • the capture molecules were printed onto the wells using split pins (n° 1545 Genetix Limited). After the spotting, the wells were washed once for 1 min with 0.2% SDS, twice with distilled water.
  • the wells were then incubated for 5 min with NaBH 4 solution (2.5 mg/ml of PBS 75%/ Ethanol 25%), washed twice with distilled water and dried.
  • the 96-well plate was stored under vacuum at 4°C.
  • One well of the obtained 96-well plate is represented as a preferred device of the invention in figure 1.

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Abstract

L'invention concerne une chambre de réaction (1) destinée à une RCP en temps réel conçue pour contenir une solution RCP (3), cette chambre présentant une molécule de capture (4) immobilisée sur la surface intérieure de la chambre, cette surface étant conçue pour être en contact intermittent avec la solution RCP (3), et une fenêtre (7) permettant de détecter un signal provenant de la surface intérieure par un lecteur (6) situé à l'extérieur de la chambre, et la molécule de capture immobilisée (4) n'étant pas marquée.
EP07729115A 2005-11-18 2007-05-14 Chambre de réaction destinée à une rcp en temps réel comprenant des sondes de capture et permettant de détecter le produit rcp par hybridation, sans ouverture du contenant rcp Withdrawn EP2027288A1 (fr)

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EP07729115A EP2027288A1 (fr) 2005-11-18 2007-05-14 Chambre de réaction destinée à une rcp en temps réel comprenant des sondes de capture et permettant de détecter le produit rcp par hybridation, sans ouverture du contenant rcp

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PCT/EP2005/012382 WO2006053769A1 (fr) 2004-11-18 2005-11-18 Quantification en temps reel de cibles multiples sur un microreseau
EP06114103A EP1788095B1 (fr) 2005-11-18 2006-05-17 Un tube pour PCR en temps réel comprenant des olgionucléotides de capture permettant la détection de l'amplificat par hybridation sans ouvrir ledit tube de PCR
PCT/EP2007/054663 WO2007131995A1 (fr) 2005-11-18 2007-05-14 Chambre de réaction destinée à une rcp en temps réel comprenant des sondes de capture et permettant de détecter le produit rcp par hybridation, sans ouverture du contenant rcp
EP07729115A EP2027288A1 (fr) 2005-11-18 2007-05-14 Chambre de réaction destinée à une rcp en temps réel comprenant des sondes de capture et permettant de détecter le produit rcp par hybridation, sans ouverture du contenant rcp

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EP06114104A Withdrawn EP1788096A1 (fr) 2004-11-18 2006-05-17 Couvercle pour un tube de PCR comprenant des sondes permettant la réaction de PCR et la détection de l'amplificat par hybridation sans ouvrir ledit tube de PCR
EP06114103A Not-in-force EP1788095B1 (fr) 2004-11-18 2006-05-17 Un tube pour PCR en temps réel comprenant des olgionucléotides de capture permettant la détection de l'amplificat par hybridation sans ouvrir ledit tube de PCR
EP06114113A Withdrawn EP1788098A1 (fr) 2005-11-18 2006-05-17 Création des sondes de capture pour la détection a haute sensitivité des produits d'une reaction d'amplification
EP07729115A Withdrawn EP2027288A1 (fr) 2005-11-18 2007-05-14 Chambre de réaction destinée à une rcp en temps réel comprenant des sondes de capture et permettant de détecter le produit rcp par hybridation, sans ouverture du contenant rcp

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EP06114103A Not-in-force EP1788095B1 (fr) 2004-11-18 2006-05-17 Un tube pour PCR en temps réel comprenant des olgionucléotides de capture permettant la détection de l'amplificat par hybridation sans ouvrir ledit tube de PCR
EP06114113A Withdrawn EP1788098A1 (fr) 2005-11-18 2006-05-17 Création des sondes de capture pour la détection a haute sensitivité des produits d'une reaction d'amplification

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EP1788095B1 (fr) 2011-04-13
EP1788095A1 (fr) 2007-05-23
CA2652011A1 (fr) 2007-11-22
CN101506374B (zh) 2013-03-27
CN101506374A (zh) 2009-08-12
WO2007131995A1 (fr) 2007-11-22
EP1788098A1 (fr) 2007-05-23
DE602006021269D1 (de) 2011-05-26
EP1788096A1 (fr) 2007-05-23

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