EP4110946A1 - Method and device for carrying out a qpcr method - Google Patents
Method and device for carrying out a qpcr methodInfo
- Publication number
- EP4110946A1 EP4110946A1 EP21706217.3A EP21706217A EP4110946A1 EP 4110946 A1 EP4110946 A1 EP 4110946A1 EP 21706217 A EP21706217 A EP 21706217A EP 4110946 A1 EP4110946 A1 EP 4110946A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- qpcr
- cycle
- reaction
- determined
- curve
- 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- Withdrawn
Links
- 238000000034 method Methods 0.000 title claims abstract description 91
- 238000006243 chemical reaction Methods 0.000 claims abstract description 93
- 238000003753 real-time PCR Methods 0.000 claims abstract description 78
- 108020004414 DNA Proteins 0.000 claims description 50
- 102000053602 DNA Human genes 0.000 claims description 48
- 238000000137 annealing Methods 0.000 claims description 18
- 230000008569 process Effects 0.000 claims description 18
- 239000012295 chemical reaction liquid Substances 0.000 claims description 17
- 238000004925 denaturation Methods 0.000 claims description 15
- 230000036425 denaturation Effects 0.000 claims description 15
- 238000012567 pattern recognition method Methods 0.000 claims description 2
- 238000004590 computer program Methods 0.000 claims 2
- 239000000126 substance Substances 0.000 description 11
- 230000003321 amplification Effects 0.000 description 9
- 238000005259 measurement Methods 0.000 description 9
- 238000003199 nucleic acid amplification method Methods 0.000 description 9
- 125000001475 halogen functional group Chemical group 0.000 description 8
- 239000002773 nucleotide Substances 0.000 description 6
- 125000003729 nucleotide group Chemical group 0.000 description 6
- 230000015572 biosynthetic process Effects 0.000 description 5
- 238000011156 evaluation Methods 0.000 description 5
- 239000003153 chemical reaction reagent Substances 0.000 description 4
- 238000001514 detection method Methods 0.000 description 4
- 244000052769 pathogen Species 0.000 description 4
- 230000001717 pathogenic effect Effects 0.000 description 4
- 230000011218 segmentation Effects 0.000 description 4
- 238000012935 Averaging Methods 0.000 description 3
- 238000013145 classification model Methods 0.000 description 3
- 238000003708 edge detection Methods 0.000 description 3
- 238000010801 machine learning Methods 0.000 description 3
- 238000012545 processing Methods 0.000 description 3
- 108020004635 Complementary DNA Proteins 0.000 description 2
- 238000013528 artificial neural network Methods 0.000 description 2
- 238000010804 cDNA synthesis Methods 0.000 description 2
- 238000004364 calculation method Methods 0.000 description 2
- 239000002299 complementary DNA Substances 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000006870 function Effects 0.000 description 2
- 230000003287 optical effect Effects 0.000 description 2
- 239000011541 reaction mixture Substances 0.000 description 2
- 239000013589 supplement Substances 0.000 description 2
- 230000009466 transformation Effects 0.000 description 2
- 238000013459 approach Methods 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000012937 correction Methods 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 238000009795 derivation Methods 0.000 description 1
- 230000001771 impaired effect Effects 0.000 description 1
- 238000010348 incorporation Methods 0.000 description 1
- 238000004020 luminiscence type Methods 0.000 description 1
- 238000000691 measurement method Methods 0.000 description 1
- 238000003752 polymerase chain reaction Methods 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 210000002966 serum Anatomy 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C12—BIOCHEMISTRY; BEER; SPIRITS; WINE; VINEGAR; MICROBIOLOGY; ENZYMOLOGY; MUTATION OR GENETIC ENGINEERING
- C12Q—MEASURING OR TESTING PROCESSES INVOLVING ENZYMES, NUCLEIC ACIDS OR MICROORGANISMS; COMPOSITIONS OR TEST PAPERS THEREFOR; PROCESSES OF PREPARING SUCH COMPOSITIONS; CONDITION-RESPONSIVE CONTROL IN MICROBIOLOGICAL OR ENZYMOLOGICAL PROCESSES
- C12Q1/00—Measuring or testing processes involving enzymes, nucleic acids or microorganisms; Compositions therefor; Processes of preparing such compositions
- C12Q1/68—Measuring or testing processes involving enzymes, nucleic acids or microorganisms; Compositions therefor; Processes of preparing such compositions involving nucleic acids
- C12Q1/6844—Nucleic acid amplification reactions
- C12Q1/6851—Quantitative amplification
-
- 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
- B01L7/52—Heating or cooling apparatus; Heat insulating devices with provision for submitting samples to a predetermined sequence of different temperatures, e.g. for treating nucleic acid samples
-
- G—PHYSICS
- G16—INFORMATION AND COMMUNICATION TECHNOLOGY [ICT] SPECIALLY ADAPTED FOR SPECIFIC APPLICATION FIELDS
- G16B—BIOINFORMATICS, i.e. INFORMATION AND COMMUNICATION TECHNOLOGY [ICT] SPECIALLY ADAPTED FOR GENETIC OR PROTEIN-RELATED DATA PROCESSING IN COMPUTATIONAL MOLECULAR BIOLOGY
- G16B25/00—ICT specially adapted for hybridisation; ICT specially adapted for gene or protein expression
- G16B25/20—Polymerase chain reaction [PCR]; Primer or probe design; Probe optimisation
-
- G—PHYSICS
- G16—INFORMATION AND COMMUNICATION TECHNOLOGY [ICT] SPECIALLY ADAPTED FOR SPECIFIC APPLICATION FIELDS
- G16B—BIOINFORMATICS, i.e. INFORMATION AND COMMUNICATION TECHNOLOGY [ICT] SPECIALLY ADAPTED FOR GENETIC OR PROTEIN-RELATED DATA PROCESSING IN COMPUTATIONAL MOLECULAR BIOLOGY
- G16B40/00—ICT specially adapted for biostatistics; ICT specially adapted for bioinformatics-related machine learning or data mining, e.g. knowledge discovery or pattern finding
- G16B40/10—Signal processing, e.g. from mass spectrometry [MS] or from PCR
Definitions
- the invention relates to the use of a polymerase chain reaction process (PCR process), in particular for detecting the presence of a pathogen.
- PCR process polymerase chain reaction process
- the present invention also relates to the evaluation of qPCR measurements.
- PCR methods are carried out in automated systems.
- the PCR systems make it possible to amplify and detect certain DNA strand sections to be detected, which can be assigned to a pathogen, for example.
- a PCR method generally comprises a cyclical application of the steps of denaturation, annealing and elongation.
- a DNA double strand is split into single strands and these are each completed again by the addition of nucleotides in order to duplicate the DNA strand sections in each cycle.
- the qPCR method enables the pathogen load to be quantified using this process.
- the nucleotides are at least partially provided with fluorescent molecules which, when attached to the single strand of the DNA strand segment to be detected, activate a fluorescent property. After the double strands have been built up, a fluorescence intensity value can be determined after each cycle, which depends on the number of DNA strand segments produced.
- a qPCR curve can then be determined from the determined intensity values, which curve has a sigmoid shape when the DNA strand section to be detected is present in the substance to be examined.
- the measured qPCR curves can be afflicted with artifacts, so that, as a rule, several parallel measurements are carried out in order to enable a more precise evaluation of the qPCR curves by averaging the measured values.
- a method for operating a quantitative polymerase chain reaction (qPCR) method comprising the following steps:
- the qPCR method has a cyclical repetition of the steps of denaturation, annealing and elongation.
- denaturing is at a high temperature
- the entire double-stranded DNA in the substance to be examined is split into two single strands.
- the annealing step one of the primers added to the substance is bound to the single strands, which primers specify the starting point of the amplification of the DNA strand segments to be detected.
- elongation step a second complementary DNA strand section is built up from free nucleotides on the single strands provided with the primer. After each of these cycles, the amount of DNA in the DNA strand segments to be detected has ideally doubled.
- the qPCR curve obtained in this way has three distinct phases, namely a baseline in which the intensity of the fluorescence of the fluorescent light emitted by built-in markers cannot yet be distinguished from the background fluorescence, an exponential phase in which the fluorescence intensity varies over the Baseline increases, that is to say becomes visible, with the fluorescence signal increasing exponentially in proportion to the amount of DNA strand segments to be detected due to the doubling of the DNA strands in each cycle, and a plateau phase in which the reagents, i. H. the primer and the free nucleotides are no longer available in the required concentrations and no further duplication takes place.
- the so-called ct (cycle threshold) value is decisive for the detection of a predetermined DNA strand section to be detected, which can correspond to a pathogen, for example.
- the ct value determines the beginning of the exponential phase and is determined by exceeding a specific limit value that is defined for the DNA strand segment to be detected and which is identical for all samples for the DNA strand segment to be detected, or it is calculated by the second Derivation of the qPCR curve determined in the exponential phase and corresponds to the intensity value of the steepest rise in the qPCR curve. If the target value is known, the initial concentration of the DNA strand section to be detected in the substance to be examined can be determined by back-calculation. In reality, the qPCR curves are very imprecise and subject to considerable fluctuations.
- a baseline drift can occur, which describes the increase in background fluorescence over the measurement cycles. This means that even if there is no amplification, the fluorescence signal increases. Further influencing factors that have a negative effect on the accuracy of the qPCR curve can result, for example, from thermal noise, fluctuations or metering tolerances in the reagent concentration, air inclusions and artifacts in the fluorescence volume.
- One idea of the above method is to take into account a reaction efficiency in each step of the PCR method, so that an evaluation of the qPCR curve can be improved.
- the reaction efficiency is largely determined by the reaction liquid in the respective reaction chamber, so that there is a clear relationship between the luminescence and the detected intensity value and the amount of the DNA strand segment to be detected.
- the DNA strand sections are not doubled in each PCR cycle, as would be the case in the ideal case, but only multiplied by a factor between 1 and 2.
- the reaction efficiency of this amplification corresponds to the proportion of this factor of the amplification that exceeds 1.
- the reaction efficiency is determined after each cycle, and the intensity value determined in each case is corrected with the reaction efficiency. That way you get one at a time Reaction efficiency of 1 idealized qPCR curve, which can be evaluated in a simplified manner in a subsequent step.
- the qPCR curves are generated in that averaged intensity values per cycle are combined into a curve which, after the measurement, is fitted to a sigmoid curve in order to evaluate the corrected qPCR curve, in particular in order to derive the CT value from it obtain.
- the PCR method can be carried out by passing a reaction liquid into a reaction chamber, in particular in each cycle, the reaction efficiency depending on an area of one or more bubbles, in particular air bubbles, in the reaction chamber, in particular the reaction chamber for an elongation process of the PCR. Process, is determined.
- the reaction efficiency is particularly impaired by bubbles in the reaction chamber, since the amount of the reaction mixture is reduced thereby. Since the number and size of bubbles in the reaction chamber can vary from cycle to cycle, the resulting reduction in reaction efficiency can also vary. Assuming that the formation of bubbles in the reaction chamber is the decisive effect for reducing the reaction efficiency, a bubble volume quotient can be defined which indicates the bubble volume as a proportion of the total volume of the reaction chamber and accordingly proportionally reduces the reaction efficiency.
- an image of the reaction chamber is recorded with the aid of a camera, the area of the one or more bubbles being determined with the aid of pattern recognition methods applied to the image of the reaction chamber.
- the bubble detection can be carried out by known methods such as thresholding (e.g. Otsu's method), edge detection, Hough transformation, data-based methods based on neural networks and the like. Since the geometry of the reaction chamber is known, an assessment of the displaced volume of the reaction liquid in each cycle can be carried out by evaluating a camera image of the reaction chamber on the basis of the bubble expansion.
- reaction efficiency can be determined with the aid of the brightness of one or more pixels of the image which correspond to the reaction liquid and the proportion of the area of the one or more bubbles in relation to the total area of the reaction chamber.
- the reaction efficiency can be determined as a function of an area of one or more bubbles in the reaction chamber for at least two of the PCR sub-process steps of denaturation, annealing and elongation.
- the intensity value of the remaining reaction volume it can be provided to select only the brightness of those pixels which definitely do not belong to a bubble or to a halo (edge area) of a bubble.
- the mean value of the brightness of the reaction chamber can be used, with the brightness being able to be determined with the aid of the bubble volume quotient, taking into account a bubble volume which generally does not have fluorescence.
- the determination of which of the pixels belong to a bubble volume, which to the halo and which to the reaction liquid can be carried out with the aid of data-based methods for what is known as semantic segmentation.
- semantic segmentation each pixel of an image is assigned a class from a number of predefined classes. With such a classifier, a camera image of the reaction chamber can be evaluated in a simple manner.
- the bubble formation in the various steps of the PCR method namely the denaturation of the annealing and the elongation
- different bubble sizes can be taken into account in the individual reaction steps of a PCR cycle, the respective bubble sizes for each of the process steps reducing the reaction efficiency.
- camera images can be evaluated in each PCR cycle, ie at the end of the Denaturation, at the end of the annealing, at the beginning of the elongation and at the end of the elongation a fluorescence measurement can be carried out.
- the first three values should have the same brightness for the same bubble volume and only differ from the intensity value of the fourth value if additional fluorescence is produced.
- the displaced bubble volume can now be taken into account for each process step within a PCR cycle, the quotient of the intensity values of successive process steps being proportional to the change in the reaction volume in the corresponding chamber. Assuming that the denatured and elongated DNA strand sections that are not amplified will rejoin the original double strands after elongation, the result at the end of a PCR cycle is a value of the reaction efficiency that depends on the brightness quotient between the individual process steps. This can then be used to correct the recorded qPCR curve.
- the corrected qPCR curve can be used to determine whether or not a DNA strand section to be detected is present.
- the qPCR method can be operated in that when the presence of the DNA strand section to be detected is detected, it is signaled that a ct value can be determined, the ct value is determined from the parameterized presence function.
- Figure 1 is a schematic representation of a cycle of a PCR
- FIG. 2 shows a system for carrying out a PCR method
- FIG. 3 shows a schematic representation of a typical qPCR curve with an intensity value profile
- FIG. 4 shows a measured course of a qPCR curve
- FIGS. 5a and 5b ideal courses of the qPCR curve for the case of a substance that cannot be detected or a substance that can be detected.
- FIG. 6 shows a flow chart to illustrate a method for operating a qPCR measurement
- FIG. 7 shows a photograph of a reaction chamber with a bubble
- FIG. 8 shows a flow chart to illustrate a further one
- FIG. 1 shows a schematic representation of a known PCR method with the steps of denaturing the annealing and the elongation.
- the double-stranded DNA in a substance is broken into two single strands at a high temperature of, for example, over 90 ° C.
- a so-called primer is attached to the single strands at a specific DNA position which marks the beginning of a DNA strand section to be detected. This primer represents the starting point of an amplification of the DNA strand segment.
- the complementary DNA strand segment is built up on the single strands starting at the position marked by the primer from the substance added, see above that at the end of the elongation step the previously split single strands have been supplemented to form complete double strands.
- an intensity value By providing the free nucleotides or the primer with fluorescent molecules that only have fluorescent properties when they are bound to the DNA strand section, it is possible to obtain an intensity value by means of a suitable measurement by determining an intensity of a fluorescence following the elongation step S3 . An intensity value is assigned to the measured intensity of the fluorescent light.
- steps S1 to S3 is carried out cyclically and the intensity values are recorded in order to obtain an intensity value profile as a qPCR curve.
- a system 10 for carrying out a PCR method is shown in FIG.
- the system has three reaction chambers, the denaturation chamber 11, the annealing chamber 12, and the elongation chamber 13 for performing denaturation, annealing or elongation, each of which is connected to an optical system by an intensity value capture.
- the optical system comprises a respective camera 14, 15, 16 which are connected to a control unit 20 in which the camera images are evaluated.
- the reaction chambers 11, 12, 13 can be closed off at least on one side with a transparent surface towards which the respective camera 14, 15, 16 is directed.
- the cameras serve to capture a camera image of the respective reaction chamber and provide it to the control unit 20.
- the cameras 14, 15, 16 are suitable for recognizing fluorescent light of the PCR method.
- the control unit 20 is designed to carry out image processing of the recorded camera images and to determine an intensity value therefrom in accordance with one of the methods described below.
- the intensity value curve has a curve that is shown in FIG. FIG. 3 shows a profile of a normalized intensity over the cycle index z.
- This course is divided into three sections, namely a baseline section B, in which the fluorescence of the built-in fluorescence molecules cannot yet be distinguished from background fluorescence, an exponential section E, in which the intensity values are visible and increase exponentially, and in a plateau section P, in which the increase in the intensity values flattens out, since the reagents used (solution with nucleotides) have been used up and no further attachment to broken single strands takes place.
- FIG. 4 shows an example of a curve of the intensity values obtained during a real measurement as a qPCR curve.
- FIGS. 5a and 5b show ideal courses of a qPCR curve without the presence of a DNA strand segment to be detected or with the presence of a DNA strand segment to be detected.
- FIG. 6 shows a flow chart to illustrate a method that is carried out in the control unit.
- the method can be implemented in a data processing device as hardware and / or software.
- a PCR measurement method is started in step S11.
- step S12 the steps of denaturation, annealing and elongation are carried out as described above and an intensity value is determined at the end of the elongation step in each cycle. This is done by taking pictures of the elongation chamber 13 with the aid of the camera 16. To determine the intensity value, the formation of bubbles in the reaction chamber can be taken into account for the elongation.
- FIG. 7 shows, by way of example, a photograph of a reaction chamber with an air bubble in the reaction liquid.
- the presence of a bubble in the reaction chamber can be determined with the aid of methods known per se. Such methods can Thresholding (Otsu's Method), edge detection, Hough transformation and detection using data-based machine learning methods, such as using deep neural networks and the like.
- the bubble area of the image can be determined on the basis of the recognized bubble, ie the area which is occupied by the bubble and the halo of the bubble. From the ratio of the bubble area and the total area of the reaction chamber, a bubble volume quotient can be determined which indicates the proportion of the volume in the reaction chamber that is occupied by the bubble and thus displaces a corresponding part of the reaction liquid.
- a recorded intensity value therefore only results from the remaining reaction liquid and can be reduced by a factor of 1 ⁇ V b according to the volume V b of the bubble, since the brightness of the fluorescence in the reaction chamber is only caused by the remaining reaction liquid.
- An alternative approach can be to select only the brightness of one or more pixels of the image of the reaction chamber and to neglect pixels that are part of a bubble or an associated halo.
- the brightnesses of pixels that are to be assigned to the reaction liquid can be averaged in order to obtain a corresponding intensity value for creating the qPCR curve.
- classification methods in particular using machine learning methods, can be used.
- semantic segmentation can be carried out with the aid of the machine learning method. With semantic segmentation, one of several classes is assigned to each pixel of a camera image.
- a data-based method with a classification model can be used, which has been trained with data labeled pixel by pixel.
- Several n-ary classifications are conceivable for this specific application:
- T ernary classification, second variant This variant supplements variant 1 with the additional class “Part of the halo of a bubble”. It can make sense to evaluate the pixels in the halo of a bubble separately, since the halo can also outshine part of the actual reaction volume. This method therefore also assumes that the position, size and orientation of the reaction chamber are known and cannot be changed relative to the camera.
- Quaternary classification This variant corresponds to a combination of variants 2 and 3. This means that pixels in halos can be evaluated separately and changes in the orientation of the reaction chamber relative to the camera can be determined and compensated for.
- the intensity values thus obtained can be corrected in step S13 by taking a reaction efficiency into account.
- the reaction efficiency is assumed to be constant, in particular in the ideal case as 1.
- the reaction efficiency varies in each cycle, so that the intensity values and the qPCR curve determined from them are incorrect.
- reaction mixture displaced by bubbles in the reaction chamber cannot contribute to the amplification, since it is located in channels or other chambers, but not in the reaction chamber. Thus, the reaction efficiency deteriorates.
- n i + i P ⁇ (1 + h)
- ii j corresponds to the number of DNA strand sections in cycle i
- h is the chemical reaction efficiency between 0 and 1.
- h is assumed to be 1 in the simplest case. In a special embodiment, this factor can also be determined by an experimental series and thus more precisely approximated.
- n i + i rii (l + Jj (l - V B i ))
- step S14 the reaction efficiency determined in this way is used in the cycle as a scaling factor and the qPCR curve is constructed using the corrected intensity values n ac tuai, i from the measured intensity values n CU rve, i: ncurve, i nactual, i ⁇ n
- step S15 it is checked whether the measuring method should be terminated. This can be the case, for example, after a termination criterion has been reached, such as a predetermined number of measuring cycles. If this is not the case (alternative: no), the method is continued in step S12, otherwise the method is ended with step S16 and the corrected qPCR curve is evaluated.
- the evaluation in step S16 can be carried out by classifying the corrected qPCR curve with the aid of a predefined classification model. In this way it can be determined whether the corrected qPCR curve indicates the presence or absence of the DNA strand section to be detected, ie indicates whether the DNA strand section to be detected is contained in the substance or not.
- FIG. 8 shows a flow chart to illustrate a further method that is carried out in the control unit.
- the method can be implemented in a data processing device as hardware and / or software.
- the qPCR process is started in step S21.
- step S22 step S1 of denaturation is carried out in the corresponding denaturation reaction chamber.
- step S23 a brightness h ü of the fluorescent light is recorded by the corresponding camera 14 of the denaturation chamber 11 at the end of the denaturation.
- step S2 The annealing process of step S2 is started in step S24.
- step S25 at the end of the annealing process, a brightness t of the fluorescent light is determined by the corresponding camera 15 of the annealing chamber
- step S26 the reaction liquid is fed into the elongation chamber 13.
- step S27 at the beginning of the elongation process, a brightness I ⁇ E , A of the fluorescent light is determined by the corresponding camera 16 of the elongation chamber
- step S28 The elongation process is started in step S28.
- step S29 a brightness h eei of the fluorescent light is recorded by the corresponding camera 16 of the elongation chamber 13 at the end of the elongation step.
- the values h di , h ai , / i eai have the same brightness, since no amplification takes place and only differ from the brightness value h eei if additional fluorescence is produced by the amplification of the elongation process.
- step S30 an overall reaction efficiency is calculated in step S30.
- Bubble volume quotients q can thus be determined as quotients of the brightnesses between the individual sub-steps as follows: h d, i + 1
- the number of DNA strand sections that is available as the beginning of the last sub-step for elongation and fluorescence incorporation thus corresponds to ne, a, i - n i ' d, i ' Ra, i ' Re, i
- this reaction efficiency can be used as a scaling factor for the measured intensity value at the end of the elongation phase.
- the reaction efficiency determined in this way is used in the cycle as a scaling factor and the qPCR curve is built up from the measured intensity values n CU rve, i with the aid of the corrected intensity values n ac tuai, i: ncurve, i nactual, i ⁇ n
- step S32 it is checked whether the measuring method should be terminated. This can be the case, for example, after a termination criterion has been reached, such as a specified number of measuring cycles. If this is not the case (alternative: no), the method is continued in step S22, otherwise the method is ended with step S33 and the corrected qPCR curve is evaluated.
- a termination criterion such as a specified number of measuring cycles.
- the evaluation in step S33 can be carried out by classifying the corrected qPCR curve with the aid of a predefined classification model. In this way, it can be determined whether the corrected qPCR curve indicates the presence or absence of the DNA strand segment to be detected, i.e. H. indicates whether the DNA strand section to be detected is contained in the substance or not.
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Abstract
Description
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Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE102020202358.1A DE102020202358B4 (en) | 2020-02-25 | 2020-02-25 | Method and device for carrying out a qPCR method |
PCT/EP2021/053643 WO2021170439A1 (en) | 2020-02-25 | 2021-02-15 | Method and device for carrying out a qpcr method |
Publications (1)
Publication Number | Publication Date |
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EP4110946A1 true EP4110946A1 (en) | 2023-01-04 |
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Application Number | Title | Priority Date | Filing Date |
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EP21706217.3A Withdrawn EP4110946A1 (en) | 2020-02-25 | 2021-02-15 | Method and device for carrying out a qpcr method |
Country Status (5)
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US (1) | US20230096593A1 (en) |
EP (1) | EP4110946A1 (en) |
CN (1) | CN115103916A (en) |
DE (1) | DE102020202358B4 (en) |
WO (1) | WO2021170439A1 (en) |
Family Cites Families (6)
Publication number | Priority date | Publication date | Assignee | Title |
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DE10045521A1 (en) | 2000-03-31 | 2001-10-04 | Roche Diagnostics Gmbh | Determining amplification efficiency of a target nucleic acid comprises measuring real-time amplification of diluted series, setting signal threshold value, and determining cycle number at which threshold is exceeded |
US6691041B2 (en) | 2000-03-31 | 2004-02-10 | Roche Molecular Systems, Inc. | Method for the efficiency-corrected real-time quantification of nucleic acids |
US7788039B2 (en) | 2003-09-25 | 2010-08-31 | Roche Molecular Systems, Inc. | Quantitation of nucleic acids using growth curves |
US10176293B2 (en) | 2012-10-02 | 2019-01-08 | Roche Molecular Systems, Inc. | Universal method to determine real-time PCR cycle threshold values |
EP3130679B1 (en) | 2015-08-13 | 2018-02-28 | Cladiac GmbH | Method and test system for the detection and/or quantification of a target nucleic acid in a sample |
WO2018213269A1 (en) | 2017-05-15 | 2018-11-22 | Arizona Board Of Regents On Behalf Of Arizona State University | Quantitative detection and analysis of target dna with colorimetric rt-qlamp |
-
2020
- 2020-02-25 DE DE102020202358.1A patent/DE102020202358B4/en active Active
-
2021
- 2021-02-15 CN CN202180016626.XA patent/CN115103916A/en active Pending
- 2021-02-15 WO PCT/EP2021/053643 patent/WO2021170439A1/en unknown
- 2021-02-15 US US17/904,302 patent/US20230096593A1/en active Pending
- 2021-02-15 EP EP21706217.3A patent/EP4110946A1/en not_active Withdrawn
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CN115103916A (en) | 2022-09-23 |
WO2021170439A1 (en) | 2021-09-02 |
DE102020202358B4 (en) | 2023-09-21 |
US20230096593A1 (en) | 2023-03-30 |
DE102020202358A1 (en) | 2021-08-26 |
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