WO2005064010A1 - Zusammensetzung zum binden von nukleinsäure an eine festphase - Google Patents
Zusammensetzung zum binden von nukleinsäure an eine festphase Download PDFInfo
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- WO2005064010A1 WO2005064010A1 PCT/EP2003/014634 EP0314634W WO2005064010A1 WO 2005064010 A1 WO2005064010 A1 WO 2005064010A1 EP 0314634 W EP0314634 W EP 0314634W WO 2005064010 A1 WO2005064010 A1 WO 2005064010A1
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- C—CHEMISTRY; METALLURGY
- C12—BIOCHEMISTRY; BEER; SPIRITS; WINE; VINEGAR; MICROBIOLOGY; ENZYMOLOGY; MUTATION OR GENETIC ENGINEERING
- C12N—MICROORGANISMS OR ENZYMES; COMPOSITIONS THEREOF; PROPAGATING, PRESERVING, OR MAINTAINING MICROORGANISMS; MUTATION OR GENETIC ENGINEERING; CULTURE MEDIA
- C12N15/00—Mutation or genetic engineering; DNA or RNA concerning genetic engineering, vectors, e.g. plasmids, or their isolation, preparation or purification; Use of hosts therefor
- C12N15/09—Recombinant DNA-technology
- C12N15/10—Processes for the isolation, preparation or purification of DNA or RNA
- C12N15/1003—Extracting or separating nucleic acids from biological samples, e.g. pure separation or isolation methods; Conditions, buffers or apparatuses therefor
- C12N15/1006—Extracting or separating nucleic acids from biological samples, e.g. pure separation or isolation methods; Conditions, buffers or apparatuses therefor by means of a solid support carrier, e.g. particles, polymers
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- C—CHEMISTRY; METALLURGY
- C12—BIOCHEMISTRY; BEER; SPIRITS; WINE; VINEGAR; MICROBIOLOGY; ENZYMOLOGY; MUTATION OR GENETIC ENGINEERING
- C12Q—MEASURING OR TESTING PROCESSES INVOLVING ENZYMES, NUCLEIC ACIDS OR MICROORGANISMS; COMPOSITIONS OR TEST PAPERS THEREFOR; PROCESSES OF PREPARING SUCH COMPOSITIONS; CONDITION-RESPONSIVE CONTROL IN MICROBIOLOGICAL OR ENZYMOLOGICAL PROCESSES
- C12Q1/00—Measuring or testing processes involving enzymes, nucleic acids or microorganisms; Compositions therefor; Processes of preparing such compositions
- C12Q1/68—Measuring or testing processes involving enzymes, nucleic acids or microorganisms; Compositions therefor; Processes of preparing such compositions involving nucleic acids
- C12Q1/6806—Preparing nucleic acids for analysis, e.g. for polymerase chain reaction [PCR] assay
Definitions
- the present invention relates to a composition for optimizing the binding of nucleic acid, preferably derived from blood, in aqueous solution to a solid phase, and to a kit for isolating nucleic acid.
- WO 00/09746 describes a blood collection vessel which contains a solution which comprises, as constituents, a guanidiumium salt, a buffer substance, a reducing agent and / or a detergent.
- the vessel is particularly suitable for. Removal of blood to be tested for nucleic acids.
- WO 01/60517 describes a vessel for taking samples which contains a nucleic acid stabilizing solution and a nucleic acid binding solid phase.
- the vessel is particularly suitable for withdrawing blood that is to be examined for nucleic acid.
- nucleic acids e.g. mRNA or viral RNA and DNA should be analyzed.
- nucleic acids contained in the sample should best be stabilized at the moment of acceptance, i.e. the degradation of the existing nucleic acids, but also the new synthesis of mRNA should be prevented.
- RNA Ribonucleases
- RNA Ribonucleic acid
- DNA DNA
- the effects of cellular and extracellular nucleases are usually under physiological control as long as the cells are in their normal environment. Taking blood leads to more or less severe changes in the nucleic acids contained in the cells. Nucleases are then released inside the cells and / or by cell lysis to the outside. In addition, nucleic acids are synthesized to a greater or lesser extent. Long-term storage of biological samples, such as blood, leads to cell aging and destruction.
- nucleic acids from other biological samples e.g. Saliva and tissue samples, too.
- nucleic acid analysis raises the question of how the entire process from sampling to nucleic acid measurement can be controlled and optimized under standardized conditions.
- a standard nucleic acid defined in quantity and quality, should be added to the sample material as soon as it is removed, which is subjected to the entire process from sampling to determination.
- the nucleic acid originally contained in the pobe should also be fed into the analysis as quantitatively as possible. This is particularly important for diagnostics, since depending on the findings, there are different consequences in the treatment of the sample donor can. This is also not possible with the conventional removal and insulation systems.
- the literature describes a method in which a blood sample is mixed with guanidinium salt immediately after the patient has taken it (EP 0 818542 A1).
- the guanidinium salt is in powder form in order to take advantage of the higher stability of the guanidinium salt.
- this method has serious disadvantages, since the salt e.g. must first dissolve in the added blood. The dissolving process is particularly temperature-dependent and cannot be controlled due to the opaque sample material used. The use of a corresponding product for diagnostic medical purposes is therefore extremely problematic.
- Nucleases are extremely active enzymes, which are found in high concentration in particular in body fluids / secretions, such as saliva or blood, and which can only be inhibited under extremely denaturing conditions. Denaturation depends on the concentration of the guanidinium salt in solution. An inhibiting concentration of guanidinium salt in solution is not given from the beginning in the process of EP 0 818 542. So there is an uncontrolled degradation of nucleic acids during the dissolution process. In this method, the addition of reducing agents is also dispensed with, without which an effective inhibition - in particular of RNases - is generally not guaranteed. Finally, EP 0 818 542 does not take any measures to isolate the nucleic acid of the sample material as quantitatively as possible.
- the present invention was based on the technical problem of specifying means for optimizing the yield of nucleic acids from biological samples, in particular specifying means that optimize the binding of nucleic acid from the sample to a solid phase.
- the agents are intended to enable an improved nucleic acid analysis method from biological samples with a lower detection limit, this being particularly desirable in the context of diagnostics.
- compositions for optimizing the binding of nucleic acid in aqueous solution to a solid phase containing a guanidinium salt, a buffer substance and a detergent, characterized in that the pH of the solution> 7, 0, preferably> 7.5, very particularly preferably> 8.0.
- kits for isolating nucleic acid containing the following components: a) an aqueous solution for stabilizing nucleic acid (also called N-sS or NAST) containing the following components: - a guanidinium salt, and / or - a buffer substance , and / or - a reducing agent, and / or - a detergent; b) a composition for optimizing the binding of nucleic acid in aqueous solution to a solid phase, containing a guanidinium salt, a buffer substance and a detergent, characterized in that the pH of the solution is> 7.0; and c) a solid phase that can bind nucleic acids.
- aqueous solution for stabilizing nucleic acid also called N-sS or NAST
- a composition for optimizing the binding of nucleic acid in aqueous solution to a solid phase containing a guanidinium salt, a buffer substance and a detergent, characterized in that the pH of the solution is>
- the kit offers the following advantages: 1.
- the sample, preferably blood, is lysed as soon as it is taken, since the sample container already contains a corresponding lysis solution, which is also a nucleic acid-stabilizing solution.
- the nucleic acid stabilizing solution causes the sample material, in particular the nucleic acids contained therein, to be stabilized immediately after contact with the solution.
- the nucleic acid stabilizing solution is also selected so that the sample material can be used directly in subsequent isolation processes. 4.
- the nucleic acid-stabilizing solution can be separated off so efficiently in the subsequent isolation that inhibition, for example of the PCR, does not occur. 5.
- An internal standard can be added to the nucleic acid stabilizing solution.
- the solid phase contained in the vessel is particularly suitable for later isolation of the nucleic acid bound to it.
- the subsequent isolation is simplified by the binding of the nucleic acids to the solid phase, since a first separation of nucleic acid and further sample components already takes place in the vessel.
- the nucleic acid stabilizing solution can be chosen so that the nucleic acid binds to the corresponding surface immediately after cell lysis or only after the addition of further reagents.
- the first case is given, for example, when a glass surface is specified in the presence of a guanidinium salt.
- the second case can be done by adding the "binding solution" or e.g. achieve or optimize by presenting a biotin-coated surface and subsequently adding streptavidin with nucleic acid binding properties.
- the kit can basically be used for processing any body fluids.
- it is suitable for processing body fluids that contain cellular components, such as. B. bone marrow, but also for example Saliva samples.
- it is preferably a kit for the direct withdrawal of whole blood from a donor.
- the kit preferably contains a vessel, which preferably consists of a conventional blood collection vessel (for example a tube), in which a defined volume of a nucleic acid-stabilizing solution and a nucleic acid-binding solid phase are contained.
- the tube is then preferably provided with a defined negative pressure, which enables only a certain volume of blood to be drawn.
- the tube can be handled using conventional blood collection methods.
- the stabilizing solution contained in the tube contains the following reagents: a guanidinium salt, e.g. B. guanidinium thiocyanate, a detergent, e.g. B. Triton-X-100, a reducing agent, e.g. B.
- the solution is compatible with the vacuum tube.
- the solution can easily be stored in the vacuum tube without affecting the desired stabilizing function.
- the entire system is particularly easy and safe for the blood donor to take samples.
- the nucleic acid-stabilizing solution containing the guanidinium salt, which serves as a lysis and stabilizing substance, the nucleic acid-binding solid phase, the buffer substance, the reducing agent and the detergent is stable in storage and converts the freshly removed material, such as blood, into a material, which is also storage stable and which can be used directly for further nucleic acid analysis or isolation.
- Guanidinium thiocyanate and / or guanidinium chloride are preferred as guanidinium salt.
- the guanidinium salt is preferably present in a concentration of 1 to 8.0 M.
- Tris or citrate is preferred as the buffer substance, the exact pH preferably being adjusted with HCl.
- other possible buffers are HEPES, MOPS, MES, citrate and phosphate buffers such as PBS.
- All nucleic acid binding materials can be used as the solid phase. Glass particles, nucleic acid-binding polymers, particles coated with such particles, nucleic acid-binding coatings of the removal system or particles coated with silica are particularly suitable.
- the surface of the nucleic acid-binding solid phase can alternatively be coated with specific binding molecules (eg streptavidi, oligonucleotides, peptide nucleic acids (PNAs), etc.) which interact directly with marker molecules on the nucleic acid or with the nucleic acid.
- specific binding molecules eg streptavidi, oligonucleotides, peptide nucleic acids (PNAs), etc.
- the shape of the materials only depends on the shape of the extraction system and the subsequent insulation method. Shapes which can subsequently be used directly in the further processing of the nucleic acid are particularly suitable, and surfaces which are compatible with conventional insulation processes, such as magnetic particles or nonwovens, are very particularly suitable.
- Suitable solid phases are commercially available, e.g. B. Silica coated magnetic particles as they are contained in the mRNA Isolation Kit for Blood / Bone Marrow (Röche).
- the buffer concentration in the nucleic acid stabilizing solution is preferably between 10 and 300 mM, particularly preferably between 10 and 100 mM.
- Triton-X-100 is preferred as a detergent in the nucleic acid-stabilizing solution.
- Other possible detergents are NP-40, Tween 20, polydocanol or other detergents.
- the detergent concentration in the nucleic acid-stabilizing solution is preferably 5 to 30% (w / v), particularly preferably 10 to 20% (w / v).
- DTT is preferred as the reducing agent, but ß-mercaptoethanol, TCEP (tris (2-carboxyethyl) phosphine) or other reducing agents can also be used.
- the preferred concentration of the reducing agent in the nucleic acid stabilizing solution is 0.1 to 10% (w / v); 0.5 to 2% (w / v) are particularly preferred.
- the pH of the solution in the nucleic acid-stabilizing solution is preferably 3.0 to 9.0, particularly preferably 4.0 to 7.5.
- the pH of the solution is chosen in particular such that a pH in the range from 5.0 to 7.5 is established in the nucleic acid-stabilizing solution after the sample material has been added. Since it is ensured by specifying the negative pressure which sample volume is removed, by presenting a desired buffer concentration or a corresponding volume of solution, it can be ensured that the desired pH is also achieved after the complete sample volume has been recorded. A pH between 6.3 and 6.9 after sample uptake is particularly preferred.
- a particularly preferred nucleic acid stabilizing solution contains 3-4 M guanidinium thiocyanate, 40-80 mM Tris, 11-14% (w / v) Triton-X-100, 40-80 mM DTT, a solid phase made of glass particles or silica-coated magnetic particles, the pH being adjusted so that a pH of 6 to 7.5 results after blood has been added.
- the volume for receiving the blood sample has a negative pressure which can be set in such a way that a predetermined blood volume is sucked into the collection vessel after a blood vessel has been pierced.
- a predetermined blood volume is sucked into the collection vessel after a blood vessel has been pierced.
- Correspondingly evacuated vessels are available on the market.
- the vessel containing the withdrawn blood can then be immediately passed to the further steps for analysis or can be stored for a longer period (up to several days or weeks) without any disadvantages for the quality of the sample.
- the freshly removed sample such as blood
- the nucleic acid-stabilizing solution described above in the removal vessel so that all processes which can change the nucleic acid pattern of the sample are stopped immediately.
- the nucleic acids can preferably already be bound to the solid phase in the vessel or be bound to the solid phase in a further reaction step, the The extent of the binding is optimized by the addition of the binding solution according to the invention.
- the data relating to the detected nucleic acids determined later in the context of nucleic acid analysis therefore very precisely represent the actual state at the time of blood collection, both with regard to the amounts and the types of nucleic acids.
- the amount of blood withdrawn preferably corresponds to 0.1 to 2 times the solution presented in the vessel.
- the latter is preferably 0.5 to 5.0 ml.
- the final concentration of guanidinium salt after sample addition is preferably 1.0 to 5 M, preferably 1.0 to 3.0 M, before the binding solution is added.
- the solution in the vessel preferably contains: a guanidinium salt in a concentration of 1 to 8 M; - a detergent in a concentration of 5 to 25% (w / v); - a buffer in a concentration of 100 to 500 mM; - A reducing agent in a concentration of 5 to 50 mM; and has a pH of> 7.5, preferably> 8.0.
- the vessel with the blood sample, stabilizing solution and binding solution contains the following components: a guanidinium salt in a concentration of 1.5 to 5, preferably 2.5 to 3.5 M; - a detergent in a concentration of 8 to 20, preferably 10 to 16% (w / v); a buffer in a concentration of 150 to 400, preferably 200 to 300 mM; a reducing agent in a concentration of 20 to 40 mM, preferably 25 to 35 mM; and with - a pH> 7.0, preferably> 7.5, particularly preferably> pH 8.0.
- the above-mentioned solution of blood sample, NsS and PrIS has a pH 10 10, preferably ⁇ pH 9.0. This measure minimizes alkaline hydrolysis of the nucleic acid.
- the kit according to the invention is preferably used for taking samples when the sample is to be used for nucleic acid analysis.
- the use of the above Nucleic acid-stabilizing solution as part of the described collection system guarantees the immediate lysis of the cells and simultaneous stabilization of the sample through immediate inactivation of the nucleases. Surprisingly, the sample obtained in this way can be stored for several days even at room temperature.
- the sampling system also ensures contamination-proof and non-infectious handling from sampling to nucleic acid isolation to analysis. In the conventional methods of nucleic acid isolation, additional handling steps (such as the transfer of the blood sample taken into the reagents for nucleic acid isolation, etc.) have always been necessary, which are associated with an additional risk of infection or contamination of the sample, as already described in detail at the beginning.
- additional handling steps such as the transfer of the blood sample taken into the reagents for nucleic acid isolation, etc.
- the kit has been described essentially in connection with a blood collection vessel, what has been said also applies to other systems for receiving biological samples, such as smears.
- the nucleic acid which is partly bound to the solid phase, can be isolated from the sample material even after prolonged storage.
- precipitates consisting of blood components, such as porphyrin salts of hemoglobin, to which nucleic acid partially binds can increasingly form with increasing storage time.
- the presence of the binding solid phase during sample lysis and stabilization leads to the immediate binding of some nucleic acids, mainly DNA, to the surface.
- Only by adding the binding solution is a complete release of the nucleic acid from the possibly formed precipitates and an optimal binding of the latter to the solid phase achieved.
- the addition should take place immediately before the actual isolation step, since adding the binding solution does not optimally stabilize the Nucleic acid is more guaranteed.
- the binding solution is preferably added immediately before the actual sample preparation in order to isolate the nucleic acid.
- the sample obtained with the kit can be supplied to common nucleic acid isolation methods; When using silica-coated magnetic particles or silica fleeces in columns, it is possible to fall back on standard nucleic acid isolation methods (magnetic separation or centrifugation or negative pressure, washing, elution of the nucleic acid).
- the present invention thus consists of a sample collection system which is designed in such a way that the following conditions are met: 1. Controlled sample removal and simultaneous stabilization of the nucleic acids (DNA, RNA) contained in the sample material. 2. Sampling, in which the use of anticoagulants can be completely dispensed with. 3. Optimized binding of the nucleic acids to a solid phase contained in the system. 4. The sample obtained with the described system can easily be integrated into existing nucleic acid isolation systems. 5. The system, including the sample it contains, is stable in storage.
- the sample obtained with the sampling system described is stable in storage in the vessel over a long period of time without degradation of the nucleic acids.
- Fig. 1 Sampling vessel with nucleic acid stabilizing substance (N-sS), defined vacuum, mixed with solid phase and sealed with septum.
- N-sS nucleic acid stabilizing substance
- Fig. 2 Graphical representation of a gel analysis (1% agarose) of 28S and 18S rRNA, which was stored in the sampling vessel for different lengths of time.
- Column 1 Isolation and separation of the RNA immediately after sampling (no storage),
- Column 2 Storage for one month at -20 ° C,
- Column 3 Storage for 6 days at 4 ° C.
- the amount of RNA applied corresponded to a blood volume of 120 ⁇ l.
- Fig. 3 Graphical representation of a gel analysis (1% agarose) of DNA that was stored in the sampling vessel for different lengths of time.
- Column 1 Isolation immediately after sampling (no storage),
- Column 2 Storage for one month at -20 ° C,
- Column 3 Storage for 6 days at 4 ° C.
- the amount of DNA applied corresponded to a blood volume of 10 ⁇ l.
- Fig. 6 Graphical representation of a gel analysis of the PCR amplificates of MS2-RNA, which was isolated after 1 or 8 days incubation at 40 ° C in serum / stabilizing solution.
- Column 1 amplificate of the RNA isolated after one day
- column 2 amplificate of the RNA isolated after 8 days.
- Column 3 DNA marker
- column 4 MS2-RNA positive control: 0.8 ⁇ g diluted 1:50 in 10 ⁇ l RT, 1 ⁇ l amplified.
- Fig. 7 Graphical representation of a gel analysis of isolated MS2-RNA after 6 (columns 2-12) or 13 (columns 14-19) days of incubation at room temperature in serum / stabilizing solution. Behind the relevant columns is the pH value that was reached after mixing the serum and stabilizing solution.
- RNA and DNA in the standard agarose gel (1% agarose).
- Column 1 Molecular weight markers
- Columns 2 to 4 Isolated nucleic acids;
- Column 2 nucleic acid from whole blood lysate mixed with MS2 RNA (7 days)
- column 3 nucleic acid: from whole blood lysate mixed with MS2 RNA (0 days, control)
- column 4 nucleic acid from whole blood lysate (7 days)
- column 5 nucleic acid from whole blood lysate (0 days, control).
- the upper bands show chromosomal DNA (clearly recognizable in all 4 samples), the lower bands in columns 2 and 3 show the added and isolated MS2 RNA.
- Example 1 Example 1:
- the blood collection system can be composed as follows (see Fig. 1): A tube is filled with a defined volume of the nucleic acid-stabilizing solution, provided with a nucleic acid-binding solid phase and with a defined vacuum, then closed with a septum , The septum is designed to be compatible with common sampling accessories (cannula, etc.).
- common sampling accessories cannula, etc.
- 2.2 ml of reagent were introduced and the vacuum was set so that exactly 1.3 ml of blood could flow in during the sampling.
- the nucleic acids contained in the inflowing blood stream were immediately converted into a stable form.
- nucleic acid stabilizing substance had the following composition in all the examples described below: 45 mM Tris, 5 M guanidinium thiocyanate, 0.8 (w / v) dithiothreitol, 18% (w / v) tritone X-100, pH 6.0.
- the nucleic acid-stabilizing substance was mixed with the sample in a ratio of 1 to 0.59 (1 volume of N-sS plus 0.59 volume of sample material).
- sample material for DNA and RNA isolation was used immediately after removal, after storage for 6 days at 4 ° C and after storage for 1 month at -20 ° C.
- RNA Isolation Kit (Röche, Cat. No. 1 828665) was used to isolate RNA (Fig. 2).
- the instruction leaflet was modified as follows: A volume of 2.4 ml of sample lysate was applied to the column in 4 aliquots with 600 ⁇ l each, so that a total of sample material from 2.4 ml of lysate was applied. All other steps were carried out according to the package insert. The RNA was finally eluted with 100 ul elution buffer.
- the QiaAmp Blood Kit (Qiagen Cat. No. 29104) was used to isolate DNA (Fig. 3).
- the standard procedure described in the package insert was modified in various ways: 400 ⁇ l sample volume was added directly to the column, the binding reagent contained in the kit not being used. 25 ⁇ l proteinase K stock solution were added and the sample was incubated for 10 minutes at room temperature. The column was then placed in a collecting vessel and centrifuged as described in the package insert. With the exception of the use of ethanol, all further steps were carried out as described in the package insert. The elution volume was 200 ⁇ l.
- Stabilizing solution used 4.0 M GTC; 13.5% Triton X100; 45 mM Tris / HCl; with 120 mM or without DTT 700 ⁇ l serum were mixed with 700 ⁇ l stabilizing solution. After 2 min incubation, 20 ⁇ l MS2-RNA (0.8 ⁇ g / ⁇ l from Röche Diagnostics) were added. The samples were incubated for 180 min at 40 ° C. and then processed in aliquots of 400 ⁇ l with the High Pure total RNA kit from Röche in accordance with Experiment 1. The samples were eluted in 50 ⁇ l and frozen at - 20 ° C. The analysis was carried out using an agarose gel (see Fig. 4).
- Stabilization solutions used 3 - 5 M GTC; 13.5% Triton X100; 50mM DTT; 42 mM Tris / HCl; pH of the solutions: approx. 5.0; pH of the solutions after addition of approx. 6.7.
- the PCR was carried out on the Lightcycler at an annealing temperature of 61 ° C using SYBR-Green as a detection system. All samples with a threshold cycle greater than 20 are considered negative because the detected signal is exclusively due to the formation of primer dimers. This can be clearly demonstrated by analyzing the melting curves on the LightCycler (Röche).
- the RT product was 1:50 with bidest. Diluted water and 1 ⁇ l of it used for a 10 ⁇ l PCR according to the following scheme:
- Fig. 5 shows the eluted MS2-RNA after 3 days incubation at 40 ° C detected in an agarose gel. Although all RNA samples can still be amplified and clearly detected after 8 days at 40 ° C (Fig. 6), clear differences in RNA integrity depending on the GTC content can be seen after only 3 days. Accordingly, a salt content of less than 2 M in the serum / stabilizing solution is advantageous for the integrity of the RNA, in particular higher temperatures, e.g. 40 degrees Celsius.
- MS2-RNA is completely degraded by RNases just 2 minutes after being added to serum and therefore no more RNA can be detected.
- This example was able to demonstrate that the degradation of the RNA can be significantly delayed by adding stabilizing solution to the serum. After 8 days at 40 ° C in serum / stabilizing solution, MS2-RNA can be detected by PCR without problems (Fig. 6), although the RNA integrity was partially impaired.
- RNA was extracted from 500 ⁇ l sample using the Röche viral RNA kit worked up according to Example 4 and isolated in 50 ⁇ l elution buffer. 20 ⁇ l of the eluate was analyzed using an agarose gel (see Fig. 7).
- the pH of the serum / stabilizing solution and thus also the pH and buffer range of the stabilizing solution is crucial for the long-term stabilization of RNA. While at a pH of 8.0 no intact RNA could be detected after only 2 days, intact RNA can still be detected in a pH range between 6.6 and 7.0 after 13 days of incubation at room temperature.
- an optimally set GTC concentration is also important for the long-term stabilization of RNA (see Example 4). The example shown illustrates that for long-term stabilization of RNA, a final GTC concentration in the stabilized sample of 2.2 M GTC is better than 2.8 M.
- the solution and blood were used in a ratio of 1: 1.
- the silica-coated magnetic particles were taken from the mRNA Isolation Kit for Blood / Bone Marrow (Röche Molecular Biochemicals). The amount of particles used per ml was approx. 35 mg.
- the blood collection system consisting of the collection tube, the stabilizing solution and the magnetic particles, was stored for 14 days at room temperature. Whole blood was then withdrawn using this system. As a control, a freshly prepared sampling system (tubes, Stabilizing solution, magnetic particles) used. The nucleic acids contained in the sample material were isolated from both approaches. The magnetic particles were separated with a magnet, the supernatant was discarded.
- the particles were resuspended in 50% ethanol, 10mM Tris, pH 7.0 and washed several times with the same solution. Finally, the particles were heated to 70 ° C. in 10 mM Tris / HCl pH 7.0, the nucleic acid detaching from the magnetic particles. The particles were separated magnetically and the supernatant containing nucleic acid was analyzed in a standard agarose gel.
- Suspension used 4.5 M GTC 15% Triton-X-100 100 mM DTT 50 mM MES 35 mg / ml particles 4 blood collection systems (tubes) containing 1.0 ml of the suspension described above were mixed with 1 ml of whole blood. Two of the tubes (whole blood lysate) were additionally treated with 25 ⁇ g MS2 RNA. One tube each of the two batches (whole blood lysate +/- MS2 RNA) was used immediately afterwards for nucleic acid isolation (implementation see example 6). The other two tubes were stored at room temperature for 7 days: after this period the nucleic acid isolation was carried out. The elution volume was 200 ⁇ l per 200 ⁇ l whole blood volume. The nucleic acids were analyzed in the standard agarose gel.
- Example 8 Extraction of mRNA and cellular and viral DNA by binding to magnetic polymer beads based on polyvinyl alcohol and to magnetic silica beads
- CMV cytomegaloviruses
- Magnetic-Beads a) 120 ⁇ l bead suspension from MagNA Pure LC total Nucleic Acid Isolation Kit (KaL No. 3038 505, Röche Molecular Biochemicals) b) 30 ⁇ l bead suspension of carboxyl-polyvinyl alcohol Magnetic Beads (M-PVA C12 Cat.No. 01-01.204) from Chemagen Biopolymer-Technologie AG, Baesweiler, GER Nucleic acid extratons protocol for a) and b):
- 2nd washing step repeat the same washing step with 500 ⁇ l washing buffer I.
- 3rd washing step add 900 ⁇ l washing buffer II (containing ethanol) from the same kit as above per sample and mix completely remove magnetic separation and supernatant Elution in 100 ⁇ l elution buffer from the same kit as above incubate for 10 min at 80 ° C and complete eluate after magnetic separation Remove g and freeze at -70 ° C until analysis
- Nucleic acid analysis agarose gel analysis: 20 ⁇ l of the eluate are analyzed on a 1% native agarose gel
- PrIS composition binding solution in the above Experiment: 3.5 M GTC; 10% Triton X 100; 350 mM Tris / HCl; pH 8.0; NsS composition (stabilizing solution) in the above Experiment: 3.5 M GTC; 12.5% Triton X 100; 60 mM Tris / HCl; 60mM DTT;
- Example 9 Detection of the binding efficiency of nucleic acid on silica surfaces by adding the binding solution ..PrIS "to the NAST-blood mixture
- PrIS composition 3.5 M GTC; 10% Triton X 100; 350 mM Tris / HCl; pH 8.0; NAST composition: 3.5 M GTC; 12.5% Triton X 100; 60 mM Tris / HCl; 60mM DTT;
- Blood sampling The blood is drawn in a NAST Vacuette® tube from Greiner BIO-ONE.
- This vacuum blood collection tube has a total volume of 5 ml and contains 2.3 ml of NsS (Nucleic Acid Stabilization) solution.
- the vacuum is set so that when the blood is drawn, 1.2 - 1.25 ml of blood flow into the tube and mix with the solution.
- 200 ⁇ l of blood correspond to 560 ⁇ l of the blood-NAS mixture.
- HCV 5.7 x 10 5 IU / ml blood NAS mixture
- CMV 2.0 x 10 6 copies / ml blood NAS mixture Storage: The blood collection tubes are stored at 20 - 24 ° C for 1 day
- Nucleic acids from 200 ⁇ l blood are present in 100 ⁇ l eluate and are stored in 10 ⁇ l aliquots at -70 ° C until analysis.
- NAST-PRIS The extracted nucleic acids consist of 90-95% from cellular RNA (ribosomal RNA, mRNA) while the chromosomal DNA as a thin band is in the range of approx. 5 -10%.
- NAST-PRIS the NAST-PRIS according to the invention, approximately 3 times more total nucleic acids and 4-13 times more total cellular RNA, which mainly consists of rRNA, are isolated.
- PAXgenes HCV concentrations of 0.6 - 1.0 x 10 4 lU / ml were measured, corresponding to a recovery of 1 - 1.75% of the spiked 5.7 x 10 5 HCV lU / ml.
- the PAXgene system achieves a 40 - 70 times worse yield for HCV compared to the NAST-PRIS system.
- NAST-PRIS A CMV concentration of approx. 8 x 10 5 copies / ml was measured, which corresponds to 40% recovery of the spiked concentration of 2 x 10 6 copies / ml.
- Paxgene CMV concentrations of 0.8 - 1, 6 x 10 5 copies / ml were measured, which represents a recovery of 4 - 8% of the spiked 2 x 10 6 CMV copies / ml.
- NAST-PRIS 8-12 ng G6P-DH mRNA were measured in 200 ⁇ l blood.
- PAXgenes 0.1-0.25 ng G6P-DH mRNA was measured in 200 ⁇ l blood. With the NAST-PRIS system according to the invention, 50-100 times more mRNA is isolated
- NAST-PRIS 190 - 430 ng G6P-DH genes were measured in 200 ⁇ l blood.
- PAXgenes 544 - 1200 ng G6P-DH genes were measured in 200 ⁇ l blood.
- RNA such as mRNA and viral RNA and DNA (e.g. HCV, CMV)
- NAST and NsS were used synonymously.
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- Measuring Or Testing Involving Enzymes Or Micro-Organisms (AREA)
Abstract
Description
Claims
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
AU2003300537A AU2003300537A1 (en) | 2003-12-19 | 2003-12-19 | Composition for binding a nucleic acid to a solid phase |
PCT/EP2003/014634 WO2005064010A1 (de) | 2003-12-19 | 2003-12-19 | Zusammensetzung zum binden von nukleinsäure an eine festphase |
EP03819173A EP1699933A1 (de) | 2003-12-19 | 2003-12-19 | Zusammensetzung zum binden von nukleinsäure an eine festphase |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
PCT/EP2003/014634 WO2005064010A1 (de) | 2003-12-19 | 2003-12-19 | Zusammensetzung zum binden von nukleinsäure an eine festphase |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2005064010A1 true WO2005064010A1 (de) | 2005-07-14 |
Family
ID=34717108
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/EP2003/014634 WO2005064010A1 (de) | 2003-12-19 | 2003-12-19 | Zusammensetzung zum binden von nukleinsäure an eine festphase |
Country Status (3)
Country | Link |
---|---|
EP (1) | EP1699933A1 (de) |
AU (1) | AU2003300537A1 (de) |
WO (1) | WO2005064010A1 (de) |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP1932913A1 (de) | 2006-12-11 | 2008-06-18 | Roche Diagnostics GmbH | Nukleinsäureisolation mithilfe von Polidocanol und Derivaten davon |
EP1983051A3 (de) * | 2007-04-20 | 2008-12-03 | Roche Diagnostics GmbH | Isolierung und Reinigung von Nukleinsäuremolekülen mit einer Festphase |
US8097717B2 (en) | 2006-12-11 | 2012-01-17 | Roche Molecular Systems, Inc. | Compositions comprising polidocanol and derivatives |
WO2023201840A1 (zh) * | 2022-04-20 | 2023-10-26 | 深圳市华晨阳科技有限公司 | 一种免疫层析检测通用的样本稀释液及其制备方法 |
Citations (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0389063A2 (de) * | 1989-03-23 | 1990-09-26 | Akzo Nobel N.V. | Verfahren zur Reinigung von Nukleinsäuren |
EP0818542A1 (de) * | 1996-07-09 | 1998-01-14 | Labordiagnostika Gesellschaft mbH | Verfahren zur Stabilisierung von Nukleinsäuren vor deren Isolierung aus Blutproben |
WO1999039000A1 (en) * | 1998-01-30 | 1999-08-05 | Akzo Nobel N.V. | Improved method for the isolation of nucleic acid |
WO2000009746A1 (de) * | 1998-08-12 | 2000-02-24 | Antigen Gmbh | Gefäss zur entnahme von blut |
WO2001060517A2 (de) * | 2000-02-15 | 2001-08-23 | Antigene Biotech Gmbh | Gefäss zur nukleinsäureanalytik |
WO2003057910A2 (en) * | 2002-01-08 | 2003-07-17 | Roche Diagnostics Gmbh | Use of silica material in an amplification reaction |
WO2003104251A2 (en) * | 2002-06-07 | 2003-12-18 | Dna Genotek Inc. | Composition and methods for obtaining nucleic acids from sputum |
DE10231659A1 (de) * | 2002-07-12 | 2004-02-05 | Antigene Biotech Gmbh | Zusammensetzung zum Binden von Nukleinsäure an eine Festphase |
-
2003
- 2003-12-19 AU AU2003300537A patent/AU2003300537A1/en not_active Abandoned
- 2003-12-19 WO PCT/EP2003/014634 patent/WO2005064010A1/de not_active Application Discontinuation
- 2003-12-19 EP EP03819173A patent/EP1699933A1/de not_active Withdrawn
Patent Citations (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0389063A2 (de) * | 1989-03-23 | 1990-09-26 | Akzo Nobel N.V. | Verfahren zur Reinigung von Nukleinsäuren |
EP0818542A1 (de) * | 1996-07-09 | 1998-01-14 | Labordiagnostika Gesellschaft mbH | Verfahren zur Stabilisierung von Nukleinsäuren vor deren Isolierung aus Blutproben |
WO1999039000A1 (en) * | 1998-01-30 | 1999-08-05 | Akzo Nobel N.V. | Improved method for the isolation of nucleic acid |
WO2000009746A1 (de) * | 1998-08-12 | 2000-02-24 | Antigen Gmbh | Gefäss zur entnahme von blut |
WO2001060517A2 (de) * | 2000-02-15 | 2001-08-23 | Antigene Biotech Gmbh | Gefäss zur nukleinsäureanalytik |
WO2003057910A2 (en) * | 2002-01-08 | 2003-07-17 | Roche Diagnostics Gmbh | Use of silica material in an amplification reaction |
WO2003104251A2 (en) * | 2002-06-07 | 2003-12-18 | Dna Genotek Inc. | Composition and methods for obtaining nucleic acids from sputum |
DE10231659A1 (de) * | 2002-07-12 | 2004-02-05 | Antigene Biotech Gmbh | Zusammensetzung zum Binden von Nukleinsäure an eine Festphase |
Cited By (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP1932913A1 (de) | 2006-12-11 | 2008-06-18 | Roche Diagnostics GmbH | Nukleinsäureisolation mithilfe von Polidocanol und Derivaten davon |
US8097717B2 (en) | 2006-12-11 | 2012-01-17 | Roche Molecular Systems, Inc. | Compositions comprising polidocanol and derivatives |
US8192958B2 (en) | 2006-12-11 | 2012-06-05 | Roche Molecular Systems, Inc. | Nucleic acid isolation using polidocanol and derivatives |
CN101200716B (zh) * | 2006-12-11 | 2012-08-29 | 霍夫曼-拉罗奇有限公司 | 使用聚多卡醇和衍生物的核酸分离 |
CN102776173A (zh) * | 2006-12-11 | 2012-11-14 | 霍夫曼-拉罗奇有限公司 | 使用聚多卡醇和衍生物的核酸分离 |
EP1983051A3 (de) * | 2007-04-20 | 2008-12-03 | Roche Diagnostics GmbH | Isolierung und Reinigung von Nukleinsäuremolekülen mit einer Festphase |
US8101744B2 (en) | 2007-04-20 | 2012-01-24 | Roche Diagnostics Operations, Inc. | Isolation and purification of nucleic acids with a solid phase |
CN101289661B (zh) * | 2007-04-20 | 2013-08-21 | 霍夫曼-拉罗奇有限公司 | 用固相分离和纯化核酸分子 |
WO2023201840A1 (zh) * | 2022-04-20 | 2023-10-26 | 深圳市华晨阳科技有限公司 | 一种免疫层析检测通用的样本稀释液及其制备方法 |
Also Published As
Publication number | Publication date |
---|---|
EP1699933A1 (de) | 2006-09-13 |
AU2003300537A1 (en) | 2005-07-21 |
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