Patent Grant
11254927
The technology described herein generally relates to methods for processing biological samples, and more particularly relates to materials for capturing polynucleotide molecules such as RNA and DNA from such samples, and permitting quantitative determination thereof.
The analysis of a biological sample such as a clinical sample or a test sample of food, for presence of a pathogen such as a virus, or to determine the presence of a particular gene, will typically include detecting one or more polynucleotides present in the sample. One type of detection is qualitative detection, which relates to a determination of the presence or absence of a target polynucleotide and/or the determination of information related to, for example, the type, size, presence or absence of mutations, and/or the sequence of the target polynucleotide. Another type of detection is quantitative detection, which relates to a determination of the amount of a particular polynucleotide present in the sample, expressed for example as a concentration or as an absolute amount by weight or volume. Detection may also include both qualitative and quantitative aspects. Quantitative detection is typically, however, a more challenging pursuit than is a simple qualitative determination of presence or absence of a polynucleotide.
Detecting polynucleotides often involves the use of an enzyme. For example, some detection methods include polynucleotide amplification by polymerase chain reaction (PCR) or a related amplification technique. Other detection methods that do not amplify the polynucleotide to be detected also make use of enzymes. However, the functioning of enzymes used in such techniques may be inhibited by the presence of materials (known as inhibitors) that accompany the polynucleotide in many biological—particularly clinical—samples. The inhibitors may interfere with, for example, the efficiency and/or the specificity of the enzymes.
Polynucleotide detection today is moving towards ever more rapid, and ever more sensitive techniques. For example, rapid and accurate diagnosis of viral infections is invaluable for accurate patient management by directing the administration of appropriate antiviral therapy, eliminating the unnecessary utilization of antibiotics and monitoring individual response to the prescribed regimen. Given its significant advantages of sensitivity, specificity and time to result, polynucleotide detection (or nucleic acid testing) has become the presumptive international standard for viral diagnosis.
However, the application of nucleic acid testing to routine diagnosis of viral targets has been limited to large clinical reference labs and major hospital labs due to the high cost, complexity and skill level requirements for implementing such testing. While significant improvements have been made in recent years, the successful detection of RNA viruses in particular requires extremely laborious extraction procedures frequently relying on the use of toxic chemicals. Furthermore, RNA molecules can be very unstable and hence can require delicate processing/handling during their determination. These issues to date have been overcome with the use of large, expensive, time consuming robotic equipment.
With the current demands on practice of medicine, laboratories that carry out diagnostic testing on patient samples see substantial benefits from having extremely high throughput, which in itself is assisted if the time to arrive at a diagnostic outcome for a given sample is made as short as possible. Testing may also be made more rapid if the actual sample on which the tests are run is made as small as possible. More recently, there has been a growing need for a small, easy to use, low-cost, automated platform for the extraction of high quality RNA from viral targets in clinical specimens.
Correspondingly, then, the need to be able to isolate minute quantities of polynucleotides from complex biological samples in a manner that effectively avoids the presence of, or reduces the detrimental impact of, inhibitors is ever more important. Furthermore, given the availability of various stand-alone automated amplification apparatuses, it is desirable to be able to routinely and reliably extract from a raw clinical sample a quantity of polynucleotide that is ready—in terms of purity and quantity—for amplification.
The discussion of the background herein is included to explain the context of the technology. This is not to be taken as an admission that any of the material referred to was published, known, or part of the common general knowledge as at the priority date of any of the claims found appended hereto.
Throughout the description and claims of the specification the word “comprise” and variations thereof, such as “comprising” and “comprises”, is not intended to exclude other additives, components, integers or steps.
The process and materials herein are applicable to a number of testing targets, in particular those that are RNA based, such as Influenza (A & B), RSV, HSV, CMV, Adenovirus, and Enterovirus.
The technology herein provides excellent RNA—as well as DNA—capture and recovery via use of micro-particles having a high RNA and DNA binding capacity, such as 100 μg/mg beads, and a >90% release efficiency. In exemplary embodiments, 8-10 μg RNA can be extracted from an overnight culture. Processes, as described herein, permit very fast (15-20 minutes including lysis) RNA extraction from cellular or viral material, via a single tube process. Processes, as described herein, comprise a streamlined procedure having fewer steps (such as six) to proceed from raw sample to purified RNA. Such processes therefore provide an extremely effective clean-up of RNA from raw biological samples, thereby permitting PCR to be performed thereon. The methods and processes are applicable across a wide variety of sample matrices, as well as clinical buffers used when collecting raw samples, e.g., M4, UTM, and Todd Hewit Broth.
Suitable targets, that have assays used in clinical testing, and that may be the subject of sample preparation processes as described herein, include, but are not limited to: Chlamydia Trachomatis (CT); Neisseria Gonorrhea (GC); Group B Streptococcus; HSV; HSV Typing; CMV; Influenza A & B; MRSA; RSV; TB; Trichomonas; Adenovirus; Bordatella; BK; JC; HHV6; EBV; Enterovirus; and M. pneumoniae.
One aspect of the present invention relates to a method for processing one or more RNA and/or DNA compounds (e.g., to concentrate the RNA and/or DNA compound(s) and/or to separate the RNA and/or DNA compound(s) from inhibitor compounds (e.g., hemoglobin, peptides, faecal compounds, humic acids, mucousol compounds, DNA binding proteins, or a saccharide) that might inhibit detection and/or amplification of the RNA and/or DNA compounds).
In some embodiments, the method includes contacting the sample containing the RNA and/or DNA compounds and PAMAM (Generation 0) that preferentially associates with (e.g., retains) the RNA and/or DNA compounds as opposed to inhibitors. The PAMAM (Generation 0) is typically bound to a surface (e.g., a surface of one or more particles). The PAMAM (Generation 0) retains the RNA and/or DNA compounds so that the RNA and/or DNA compounds and inhibitors may be separated, such as by washing the surface with the compound and associated RNA and/or DNA compounds. Upon separation, the association between the RNA and/or DNA compound and the PAMAM(Generation 0) may be disrupted to release (e.g., separate) the RNA and/or DNA compounds from the compound and surface.
The present disclosure provides for a method for isolating polynucleotides from a cell-containing sample, the method comprising: contacting the sample with a lysis solution and a plurality of binding particles coated in PAMAM(Generation 0), so that the polynucleotides are liberated from the cells and become bound to the PAMAM(Generation 0), thereby creating binding particles bound with polynucleotides and a solution containing residual cellular matter; compacting the binding particles bound with polynucleotides; removing the solution containing residual cellular matter; washing the binding particles; and releasing the polynucleotides from the binding particles.
The present disclosure further includes a process for concentrating RNA from a sample containing polymerase chain reaction inhibitors, the method comprising: contacting between 500 μl and 1 ml of the sample with a plurality of RNA binding particles, the binding particles configured to preferentially retain the RNA in the sample as compared to the polymerase chain reaction inhibitors; concentrating the plurality of particles having the one or more polynucleotides bound thereto into an effective volume between 50 nanoliters and 5 microliters; and releasing the one or more polynucleotides into <30 μl of solution.
The present disclosure still further includes a composition comprising: carboxyl modified microparticles; and PAMAM(Generation 0) bound via one or more amine groups per molecule to one or more of the carboxylic acid groups on the microparticles.
The present disclosure additionally includes a kit, comprising: a number of sealed tubes, each containing lysis buffer; a tube containing lyophilized microparticles having PAMAM(Generation 0) bound thereto; a tube containing liquid wash reagents, sufficient to analyze the number of samples; and a tube containing liquid release reagents, sufficient to analyze the number of samples, wherein each component of the kit is stored in an air-tight container.
The present disclosure still further includes a kit, comprising: a first air-tight pouch enclosing a number of tubes, each tube containing lyophilized microparticles having PAMAM(Generation 0) bound thereto; a second air-tight pouch enclosing a number of reagent holders, each holder comprising: a tube containing liquid lysis reagents; a tube containing liquid wash reagents; and a tube containing liquid release reagents.
The present disclosure additionally includes a method of making a polynucleotide retention member, the method comprising: washing a quantity of microspheres with carbonate and MES buffer; preparing sulfo-NHS and EDAC; incubating the microspheres with sulfo-NHS and EDAC for 30 minutes; washing the microspheres with MES and borate buffer; contacting the microspheres with PAMAM(0) for 8-10 hours; and rinsing unbound PAMAM(0) from the microspheres.
Like reference symbols in the various drawings indicate like elements.
Analysis of biological samples often includes determining whether one or more polynucleotides (e.g., a DNA, RNA, mRNA, or rRNA) is present in the sample. The technology described herein has applicability to determining both RNA and DNA that is present in a sample. For example, a sample may be analyzed to determine whether the RNA of a particular pathogen is present, and also whether DNA of another or the same pathogen is present. If present, the RNA or the DNA may together or separately be indicative of a corresponding disease or condition.
Accordingly, the technology described herein is directed to materials that bind polynucleotides, and use of such materials in isolating polynucleotides, such as DNA and RNA, from biological samples. The materials, in conjunction with methods of using the materials, provide for rapid and reliable extraction of RNA and DNA from many different types of biological samples, including quantitative determination of both the RNA and the DNA. Such methods are typically referred to as “sample preparation” methods. What is meant by such a term is the liberation, extraction, concentration, and/or isolation, of RNA and/or DNA of a target organism from a raw sample—such as obtained directly from a patient or an agricultural or food product—where the raw sample contains the target RNA and/or target DNA bound in cellular form. The liberated target RNA and/or target DNA is placed, at the culmination of the process, in a form suitable for amplification and/or detection.
The terms DNA (deoxyribonucleic acid) and RNA (ribonucleic acid), and together as polynucleotides, as used herein can mean an individual molecule or population of molecules, such as identifiable by having a specific nucleotide sequence common to all, or can mean collectively molecules of DNA or RNA having different sequences from one another. For example, a biological sample from a human patient may contain DNA from the patient's cells, having one sequence, and DNA or RNA from cells of a pathogen, having a different sequence from that of the patient's DNA. The sample is thus referred to as containing DNA and RNA (or, together, polynucleotides), even though there are molecules of DNA (or RNA) in the sample that are different (chemically distinct) from one another. The methods herein can be used to liberate, collectively, molecules of DNA and RNA from both the patient's and the pathogen's cells in such a sample. Typically, however, in such an instance, it will usually be the DNA or RNA of the pathogen that will be of interest, and which will be selectively amplified from amongst all the DNA and RNA that is ultimately isolated from the sample. The DNA and RNA that is best suited for extraction by the methods herein has a size less than 7.5 Mbp, though it would be understood that larger DNA and RNA molecules may be susceptible to extraction and detection by the methods herein.
Typically, biological samples are complex mixtures. For example, a sample may be provided as a blood sample, a tissue sample (e.g., a swab of, for example, nasal, buccal, anal, or vaginal tissue), a biopsy aspirate, a lysate, as fungi, or as bacteria. The RNA and/or DNA to be determined is normally contained within particles (e.g., cells such as white blood cells, or red blood cells), tissue fragments, bacteria (e.g., gram positive bacteria, or gram negative bacteria), fungi, or spores. One or more liquids (e.g., water, a buffer, blood, blood plasma, saliva, urine, cerebral spinal fluid (CSF), or organic solvent) is typically part of the sample and/or is added to the sample during a processing step. The materials and methods described herein are compatible with a variety of clinical matrices, at least including blood, urine, CSF, swab, and plasma.
Methods for analyzing biological samples include releasing RNA and/or DNA from the particles (e.g., bacteria) in the sample, amplifying one or more of the released RNA and/or DNA (e.g., by polymerase chain reaction (PCR)), and determining the presence (or absence) of the amplified polynucleotide(s) (e.g., by fluorescence detection).
Clinical samples present a variety of challenges especially in the detection of target RNA and DNA through PCR or similar technologies. A target nucleic acid could be present in a concentration as low as 10 copies per milliliter as measured against a background of millions or billions of copies of competing nucleic acids (such as from a patient's normal cells). Moreover, a variety of other biochemical entities present in the clinical sample inhibit PCR. The inhibitors may also frustrate isolation of RNA or DNA from the sample, such as by being captured by a material designed to retain the RNA or DNA. If the concentration of inhibitors is not reduced relative to the RNA or DNA to be determined, the analysis can produce false negative results. Examples of these inhibitors, dependent upon the biological sample in question, are cellular debris such as membrane fragments, humic acids, mucousal compounds, hemoglobin, other proteins such as DNA binding proteins, salts, DNAases, fecal matter, meconium, urea, amniotic fluid, blood, lipids, saccharides, and polysaccharides. For example, such inhibitors can reduce the amplification efficiency of DNA and RNA by PCR and other enzymatic techniques for determining the presence of DNA and RNA.
Therefore, an effective sample preparation method should lead to a concentration of the target RNA or DNA, and should minimize presence of inhibitory substances. The methods described herein may increase the concentration of the DNA and/or RNA to be determined and/or reduce the concentration of inhibitors relative to the concentration of DNA and/or RNA to be determined.
In addition, cells of some target organisms, such as gram positive bacteria (e.g. Group B Strep), are very hard to lyse, meaning that lysing conditions can be very severe. Such organisms may require additional chemicals for lysing, such as mutanolysin, and may also require higher temperatures for optimal lysis. Such conditions may be accommodated by the materials and methods described herein.
Sample Preparation Process
A typical sample preparation process may be carried out in a processing chamber that includes a plurality of particles (e.g., beads, microspheres) configured to retain RNA and/or DNA of the sample under a first set of conditions (e.g., a first temperature and/or first pH) and to release the RNA under a second set of conditions (e.g., a second, higher temperature and/or a second, more basic, pH), and to release DNA under a third set of conditions (e.g., a third, different temperature and/or a third, more basic, pH than that used in the first and second conditions). Typically, the DNA and RNA are retained preferentially as compared to inhibitors that may be present in the sample.
An exemplary sample preparation process is illustrated in
A first pipette tip 103 contains a solution 107 of microparticles 105, that are delivered to the process tube and contacted with the biological sample contained therein. The surfaces of particles 105 are modified to have PAMAM(0) attached, as further described herein, so that they retain RNA and/or DNA in preference to inhibitors in solution. Solution 107 may be a lysis solution, as further described herein. The lysis solution may contain a detergent, in addition to various enzymes, as described elsewhere herein. Thorough mixing of the microparticles, the solution, and the biological sample may occur simply by turbulent combination of the two solutions upon release of the microparticle containing solution from the pipette tip, or may occur via mechanical or manual agitation of process tube 101.
First pipette tip 103 is positioned above process chamber 101, such as by manual operation by a user, or such as by an automated pipetting head, an example of which is described in U.S. provisional patent application Ser. No. 60/959,437, filed Jul. 13, 2007, which is incorporated herein by reference.
At 110, using the same process tube 101, the microparticles, biological sample, and lysis reagents are incubated, such as by applying heat from an external source, as shown, so that the cells in the biological sample are lysed, and liberate RNA and/or DNA. Under these conditions, the DNA molecules bind to suitably configured surfaces of the micro-particles, as further described herein. Typically, the particles retain RNA and/or DNA from liquids having a pH about 9.5 or less (e.g., about 9.0 or less, about 8.75 or less, about 8.5 or less). It is to be noted that the binding of DNA to the affinity microparticles happens concurrently with the lysis process, and the binding is not adversely affected by the presence of detergents and, in some instances, lytic enzymes in the lysis solution. The choice of temperature is dictated by what is required to lyse the cells in question, and heat is not required to effectuate binding of the RNA or DNA to the particles. Typically, those cells having tougher cell walls (e.g., lysteria, or anthrax) will require higher temperatures. For example, Chlamydia determination utilizes a temperature of 37° C. for a duration of 5-10 minutes for lysis and binding, whereas Group B Streptococcus determination utilizes a temperature of 60° C. for a duration of 5-10 minutes. Generally, the liquid is heated to a temperature insufficient to boil liquid in the presence of the particles.
At 120, the microparticles are concentrated or compacted, and the remaining solution containing residual cellular matter 125 is removed, for example by a second pipette tip 123. By compacted is meant that the microparticles, instead of being effectively uniformly distributed through a solution, are brought together at a single location in the process tube, in contact with one another. Where the microparticles are magnetic, compaction of the microparticles may be achieved by, for example, bringing a magnet 121 into close proximity to the outside of the process chamber 101, and moving the magnet up and down outside the chamber. The magnetic particles are attracted to the magnet and are drawn towards the inside of the wall of the process chamber adjacent the magnet.
Pipette tip 123 removes as much of the remaining solution (sometimes referred to as supernatant, or solution having residual cellular matter) as is practical without drawing up significant quantities of microparticles. Typically a pipette tip may slide into process chamber 105 without contacting the microparticles. In this way the microparticles are concentrated, by being present in a smaller volume of solution than hitherto. Pipette tip 123 may be a different tip from pipette tip 103, or may be the same tip. In some embodiments, after removal of the solution containing residual cellular matter, less than 10 microliters of solution is left along with the particles. Typically this is achieved by both compaction of the microparticles to a small pellet, but also positioning that pellet away from the location wherein the pipette will be introduced for removal of the supernatant. The positioning of the pipette in relation to the bottom of the tube is also important so that almost all of the supernatant is removed. The pipette tip should be almost close to the bottom of the tube (within 1-2 mm) but without completely sealing the pipette tip against the tube bottom. A stellated pattern may also be used at the bottom of the lysis tube, (as described in U.S. provisional patent application Ser. No. 60/959,437, filed Jul. 13, 2007, and incorporated herein by reference), but the positioning of the patterns in relation to the location of the magnet becomes important so that the sliding of the compacted microparticles is not hindered and the crevices between vertices of the stellated pattern do not trap microparticles.
At 130, a third pipette tip 133 delivers a wash solution 131 to the process chamber 101 containing compacted microparticles. The wash solution may comprise, e.g., a buffer such as Tris-EDTA with a surfactant such as 1% Triton X 100, and having an overall pH 8.0. Typically, the volume of wash buffer is 100 microliters or less, where the sample is 2 ml or less in volume. The wash solution is used to wash off any non-DNA and non-RNA molecules, such as inhibitors, that may have become bound to the microparticles. The wash solution is chosen to preferentially wash off non-RNA and non-DNA molecules while leaving in place those RNA and/or DNA molecules bound to the microparticles. Pipette tip 133 may be a different tip from either or both of pipette tips 103 and 123, or may be one of those tips being re-used.
In order to release the RNA and, separately, the DNA from the particles, the wash solution 131 is replaced with an alkaline (pH ˜9.0) release solution, e.g., a buffer solution having a pH different from that of the wash solution. This can be done by pipetting out as much of the wash solution as possible, for example, having a residual volume <5 microliters, and then dispensing release buffer with a new pipette tip. In case the same tip is used, the liquid should be completely drained off so as not to dilute the release solution. For example, at 140, a release solution 141 is delivered to process chamber 101 so that the RNA bound to the micro-particles can be liberated from those micro-particles. In general, the PAMAM(Generation 0) on the particles (as further described herein) most efficiently releases RNA when the pH is about 9. Consequently, RNA can be released from the particles into the surrounding liquid. In some instances, heat may be applied to the process tube, such as to heat the solution to 85° C., to facilitate release of the RNA. Generally, the liquid is heated to a temperature insufficient to boil liquid in the presence of the particles. In some embodiments, the temperature is 100° C. or less (e.g., less than 100° C., about 97° C. or less). In some embodiments, the temperature is about 65° C. or more (e.g., about 75° C. or more, about 80° C. or more, about 90° C. or more). In some embodiments, the temperature is maintained for about 1 minute or more (e.g., about 2 minutes or more, about 5 minutes or more, about 10 minutes or more). In some embodiments, the temperature is maintained for about 30 minutes (e.g., about 15 minutes or less, about 10 minutes or less, about 5 minutes or less). In some embodiments, the process tube is heated to between about 65 and 90° C. (e.g., to about 70° C.) for between about 1 and 7 minutes (e.g., for about 2 minutes). In other embodiments, the heating is to 85° C. for 3 minutes. In still other embodiments, the heating is to 65° C. for 6 minutes. In general, a longer heating time is required for a lower temperature. Alternatively, or in combination, particles with retained RNA are heated to release the RNA without assistance of a release solution. When heat alone is used to release the RNA, the release solution may be identical with the wash solution.
Typically, the RNA from a 2 ml sample, and according to the description of the lysis, binding, and washing described elsewhere therein, is released into about 20 microliters or less (e.g., about 10 microliters or less, about 5 microliters or less, or about 2.5 microliters or less) of liquid.
While releasing the RNA has been described as including heating, the RNA may be released without heating. For example, in some embodiments, the release solution has an ionic strength, pH, surfactant concentration, composition, or combination thereof that releases the RNA from the retention member without requiring heat.
It is to be noted that excessive shearing, such as is caused by rapid movements of the liquid during suck-and-dispense mixing operations during wash and release (typically during DNA release) in the sample preparation process may release PAMAM(Generation 0) from the surface of the particles, which itself causes downstream inhibition of PCR. The mixing steps should be limited to less than 10 suck-and-dispense operations, where the amount moved back and forth ranges from 1-20 microliters moved in the pipette, performed over 1-10 seconds per suck-and-dispense operations.
At 150 the microparticles, now having essentially no RNA bound thereto, can be compacted or concentrated in a similar manner to that described for 120, but in this case to facilitate removal of the release solution containing the RNA dissolved therein. For example, magnetic beads can be collected together on the interior of the process chamber wall by bringing magnet 121 into close proximity to the outside of the process chamber. In
In instances where a sample contains both RNA and DNA, and it is desired to determine both a particular RNA and a particular DNA, the procedures at 140 and 150, as described herein, may be repeated, using a second release solution that is designed to release DNA. As described further in U.S. patent application Ser. No. 12/172,208, filed on even date herewith, and entitled “POLYNUCLEOTIDE CAPTURE MATERIALS, AND METHODS OF USING SAME”, a solution designed to release DNA typically has a pH of about 12 or greater. Such a procedure relies on the fact that RNA and DNA have different pKa's and therefore will elute from the surface of a particle to which they are non-covalently bound, at different pH's from one another. Similar considerations, such as release conditions (temperature, reagent concentrations, etc.) apply to release of DNA as to RNA.
It is to be noted that, thus far, all of the processing steps have taken place in a single tube. This is advantageous for a number of reasons: first, that unnecessary liquid transfer steps will necessarily lead to some loss of target material. Additional liquid transfer steps will also add to the overall time of the protocol. It should be noted that performing all the liquid processing in a single tube is not an easy task primarily because of the residual volumes left between successive liquid transfers. It becomes even more difficult when the final elution volume is very low, such as less than 30 microliters, or less than 20 microliters or less than 10 microliters, or less than 5 microliters. Nevertheless, with the protocols described herein, very good yields may be obtained.
The RNA, and/or subsequently the DNA, liberated from the microparticles can each be drawn up into a fourth pipette tip 153 in solution in the release solution. Pipette tip 153 need not be different from all of pipette tips 103, 123, and 133 and may therefore represent a re-use of one of those tips. Although it is desirable to use magnetic beads, non-magnetic beads may also be used herein, and separated by, e.g., centrifugation, rather than by use of a magnet.
In certain embodiments, the ratio of the volume of original sample introduced into the processing tube to the volume of liquid into which the RNA or DNA is released is at least about 10 (e.g., at least about 50, at least about 100, at least about 250, at least about 500, at least about 1,000). In some embodiments, RNA or DNA from a sample having a volume of about 2 ml can be retained within the processing tube, and released, after binding and washing, into about 4 microliters or less (e.g., about 3 microliters or less, about 2 microliters or less, about 1 microliter or less) of liquid.
In some embodiments, the sample has a volume larger than the concentrated volume of the binding particles having the RNA or DNA bound thereto by a factor of at least about 10.
In other embodiments, the sample has a volume of 100 μ-1 ml, and the compacted particles occupy an effective volume of less than 2 microliters.
The liquid into which the RNA or DNA is released typically includes at least about 50% (e.g., at least about 75%, at least about 85%, at least about 90%, or at least about 95%) of the RNA or DNA respectively present in the sample 109. Thus, for example, ˜8-10 μg DNA can be liberated from 1 ml of overnight culture, and 2-4 μg DNA can be extracted from one buccal swab. The concentration of RNA or DNA present in the release liquid may be higher than the respective concentration in the original sample because the volume of release liquid is typically less than the volume of the original liquid sample. For example, the concentration of DNA in the release liquid may be at least about 10 times greater (e.g., at least about 25 times greater, at least about 100 times greater) than the concentration of DNA in the sample 109. The concentration of inhibitors present in the liquid into which the RNA or DNA is released is generally less than the concentration of inhibitors in the original fluidic sample by an amount sufficient to increase the amplification efficiency for the RNA or DNA over that which could be obtained from an unpurified sample.
In general, although the processes and materials described herein are capable of performing well—usually with only routine adaptation—over a wide range of sample sizes, and reagent volumes, for most practical applications (considering the size of most biological samples subject to diagnostic analysis), the volume of compacted particles having RNA and/or DNA bound thereto that results (prior to release) is in the range 2-3 μl, and is independent of the sample volume, up to about 2 ml of sample. Typically the quantity of microparticles required is determined by the quantity of RNA and/or DNA in the sample. It is found that, given the efficiency of binding to the particles, 0.5 mg of particles is sufficient for most manual applications, and most involving automated pipetting, regardless of sample size. Thus, for example, for samples having volumes from 0.5 microliters to 3 milliliters, the volume of the compacted particles is 2-3 μl. For example, for Chlamydia, the sample size is typically 1 ml, and 0.5 mg of particles is sufficient. For other applications, DNA from a 2 ml sample can also be extracted with 0.5 mg particles, or in some instances 1 mg beads can be used. For smaller samples, such as having a volume of 5 μl, it is still typical to use only 0.5 mg particles.
In order to agitate the solution at various stages during the manual process, the solution may be pipetted up and down a number of times, such as 10 times, 15 times, or 20 times. Such a procedure is acceptable during the release step as well as the wash steps. Vortexing also works for these steps. However, for the automated process, cannot tolerate any mix steps, the number of mixing operations is kept at a minimum as this was possibly causing some PAMAM(0) to come off and inhibit downstream PCR.
The process described herein represents an extremely effective clean-up of a sample in preparation for PCR and provides the capability to detect as few as 25 copies of RNA or DNA from 1 milliliter of clinical sample. The RNA or DNA is present in a high level of concentration because the elution volume can be as low as 3 microliters. There is also a low residual sample liquid and/or wash volume in the concentrated microspheres, thereby minimizing dilution by sample or wash buffer, as well as minimizing inhibition from residual sample.
The time interval between introducing the polynucleotide containing sample to processing tube 101, and releasing the RNA or DNA into the release liquid is usually between 10 and 30 minutes, and is typically about 15-20 minutes, or may be 15 minutes or less (e.g., about 10 minutes or less, about 5 minutes or less). These times include the lysis time (which doubles up as a sample-binding time), and are extremely fast. To release both RNA and DNA, separately, from a single sample, it is only necessary to add an additional release procedure, as in 140 in
Optionally, at 160 in
The RNA or DNA in solution in vessel 161 is in a state that it can be amplified, such as by PCR, and detected. Furthermore, the foregoing process steps are extremely reliable and robust, and enable quantitative assays of the extracted RNA or DNA over 7 log dilutions (10-107 copies of target RNA or DNA/ml of sample).
The process of
The process shown in
Where a magnet is shown in
Where it is shown in
The process shown in
Moving from 220 to 230 in
While samples and various solutions have been described herein as having microliter scale volumes, other volumes can be used. For example, processing tubes with surfaces (e.g., particles) configured to preferentially retain RNA and/or DNA as opposed to inhibitors may have large volumes (e.g., many tens of microliters or more, at least about 1 milliliter or more).
In some embodiments, the processing tube has a bench-top scale, and other solutions are correspondingly scaled up.
Polynucleotide Capture Material
Suitable polynucleotide affinity molecules are those that offer a very high density of positively ionizable charges at a low pH, and enable strong attraction and binding of polynucleotides, including RNA and DNA from a clinical lysate, within a few minutes.
A typical embodiment of the materials herein uses: Polyamidoamine (PAMAM) Generation 0, available from the Sigma-Aldrich Chemical Company (“Sigma-Aldrich”), product number 412368. This material, referred to hereinafter as “PAMAM(Generation 0)” or “PAMAM(0)” of “PAMAM(G0)”, is a dendrimer whose molecules have the following structure.
The core of the molecule is an ethylene diamine substituted twice on both nitrogen atoms by an acetyl group. Each acetyl group has itself reacted with ethylene diamine monomers to yield amino-substituted amide groups.
The form of PAMAM(0) suitable for use herein is not limited to that product available from Sigma-Aldrich, however. PAMAM(0), being dendrimeric in nature, admits of a wide range of forms, controlled at least in part by the extent of dendrimerization permitted during its synthesis. Thus, many variants of PAMAM(0), having variously, different numbers of substituting units, are suitable for use herein. In general, there is a range of sizes of dendrimer molecule (or PAMAM(0) derivative) that is suitable for polynucleotide capture: smaller sizes don't capture enough RNA or DNA, whereas larger sizes retain the RNA or DNA too strongly, and do not permit easy release. Additionally, different monomers from ethylene diamine may be used to make a variant of PAMAM suitable for use herein. Such monomers may include, without limitation, 1,2-propylene diamine, 1,3-propylene diamine, 1,2-butylene diamine, 1,3-butylene diamine, and 1,4-butylenediamine.
Molecules of PAMAM suitable for use herein may also be characterized by molecular weight. In particular, PAMAM(0) has a molecular weight of 516; other suitable PAMAM molecules have weights in the range 500-600 Da.
PAMAM(0) can itself function as an inhibitor of enzymatic processes such as DNA and RNA amplification, and therefore it is important that it be used in a manner in which it does not reside in solution together with the released RNA and/or DNA. Aspects of this are further described in the Examples, hereinbelow.
Support Materials
During use, PAMAM(0) is typically immobilized on, such as bound to the surface of, a solid support such as carboxylated beads, or magnetic or non-magnetic beads. In many embodiments, such a solid support comprises microparticles, such as beads, and microspheres. These terms, microparticles, beads, and microspheres may be used interchangeably herein. The particles are typically formed of a material to which the PAMAM(0) can be easily associated. Exemplary materials from which such particles can be formed include polymeric materials that can be modified to attach a ligand. Typically, such a solid support itself may be derivatized to yield surface functional groups that react easily with PAMAM(0) molecules to create a chemical bond between the surface and the PAMAM(0). A frequently-employed—and desirable—surface functional group is the carboxylic acid (COOH) group. Exemplary polymeric materials that provide, or can be modified to provide, carboxylic groups and/or amino groups available to attach PAMAM(0) include, for example, polystyrene, latex polymers (e.g., polycarboxylate coated latex), polyacrylamide, polyethylene oxide, and derivatives thereof. Polymeric materials that can used to form suitable particles are described in U.S. Pat. No. 6,235,313 to Mathiowitz et al., which patent is incorporated herein by reference. Other materials include glass, silica, agarose, and amino-propyl-tri-ethoxy-silane (APES) modified materials.
During the process of reaction of a PAMAM(0) molecule with a carboxylated particle, such as a magnetic particle, one of the amine groups out of the total possible amine groups on a PAMAM(0) molecule, such as 6 possible groups in the aforementioned product from Sigma Aldrich, is consumed to react with the COOH group of the surface of the particle to form a carbodiimide bond. (See, e.g., U.S. application Ser. No. 11/281,247, page 40). The remainder of the total number amine groups, such as 5 groups in the aforementioned product from Sigma Aldrich, are available for protonation.
In some embodiments, a synthetic protocol comprises: washing a quantity of microspheres with carbonate and MES buffer; preparing sulfo-NHS and EDAC; incubating the microspheres with sulfo-NHS and EDAC for 30 minutes; washing the microspheres with MES and borate buffer; contacting the microspheres with PAMAM(0) for 8-10 hours; and rinsing unbound PAMAM(0) from the microspheres. An example of synthetic protocols for making PAMAM(0)-bound microparticles, is given in the Examples, hereinbelow.
There are a variety of sources of bead or particle that can be used to bind PAMAM(0), and used in the processes described herein, for example: Seradyn Magnetic carboxyl modified magnetic beads (Part #3008050250, Seradyn), Polysciences BioMag carboxyl beads, Dynal polymer encapsulated magnetic beads with a carboxyl coating, and Polybead carboxylate modified microspheres available from Polyscience, catalog no. 09850.
The high density of the PAMAM(0) molecules on bead surfaces permits even a small quantity of beads (0.5 mg) to be used for clinical samples as large as a milliliter, and permits binding of even low levels of target RNA or DNA (<100 copies) in a background of billions of copies of other polynucleotides.
In some embodiments, at least some (e.g., all) of the particles are magnetic. In alternative embodiments, few (e.g., none) of the particles are magnetic. Magnetic particles are advantageous because centrifugation is generally not required to separate them from a solution in which they are suspended.
Particles typically have an average diameter of about 20 microns or less (e.g., about 15 microns or less, about 10 microns or less). In some embodiments, particles have an average diameter of at least about 4 microns (e.g., at least about 6 microns, at least about 8 microns). Magnetic particles, as used herein, typically have an average diameter of between about 0.5 microns and about 3 microns. Non-magnetic particles, as used herein, typically have an average diameter of between about 0.5 microns and about 10 microns.
The particle density is typically at least about 107 particles per milliliter (e.g., about 108 or about 109 particles per milliliter). For example, a processing region, such as present in a microfluidic device configured for used in sample preparation, with a total volume of about 1 microliter, may include about 103 beads.
In some embodiments, at least some (e.g., all) the particles are solid. In some embodiments, at least some (e.g., all) the particles are porous (e.g., the particles may have channels extending at least partially within them).
The microparticles described herein are not only suitable for use in process tubes that are handled by manual pipetting operations, but they can be used in a microfluidic devices, such as in sample concentrator, thereby enabling even sub-microliter elution volumes to be processed, as applicable.
The microparticles having PAMAM(0) bound thereto are particularly effective at capturing, and releasing RNA, and also DNA. In some embodiments, the ratio by weight of the RNA captured by the binding particles, to the binding particles prior to contact with the RNA, is 5-20%. In other embodiments, the ratio is 7-12%. In still other embodiments, the ratio is about 10%, corresponding to, e.g., 100 μg of RNA for each mg of particles.
The microparticles having PAMAM(0) bound thereto are particularly effective at capturing RNA, and/or DNA, consistently over a wide range of concentrations, thereby permitting quantitative analysis of the RNA and/or DNA to be carried out. In some embodiments, the binding particles capture 90% or more of the RNA or DNA liberated from cells into a solution in contact with the binding particles, over a range of 1 to 107 copies of target RNA or DNA/milliliter of sample.
In some embodiments, the binding particles release 90% or more of the DNA bound thereto when certain release conditions are deployed.
Sample Preparation Kits
Microparticles, coated with PAMAM(0), can be provided to a user in solid form, such as in lyophilized form, or in solution. It is desirable that the reagent, however provided, can be used immediately by a user for whatever intended purpose, without any preparatory steps. Microparticles prepared by the methods described herein can be lyophilized by methods known in the art, and applicable to microparticles of the sizes and characteristics described herein.
In each of the kits described herein, neutralization reagents are not required in the event that the kits are only to be used for determining RNA compounds. Thus neutralization reagents may be provided but are optional. Neutralization reagents are typically deployed in instances when the kits are used for DNA determination or for determining both RNA and DNA.
Such microparticles can also be provided in kit form, in conjunction with other reagents that are used, for example, in sample preparation. One embodiment of a kit comprises a number of, such as 24, sealed tubes, each containing lysis buffer; a tube containing lyophilized microparticles having PAMAM(0) bound thereto; a tube containing liquid wash reagents, sufficient to analyze the number of samples; a tube containing liquid neutralization reagents, sufficient to analyze the number of samples; and a tube containing liquid release reagents, sufficient to analyze the number of samples, wherein each component of the kit is stored in an air-tight container. Other numbers of tubes available in kit form include 12, 25, 30, 36, 48, 50, 60, and 100. Still other numbers are also permissible and consistent with the description herein.
Furthermore, in other embodiments of such a kit, the tube containing lyophilized microparticles can additionally contain particles of reagents selected from the group consisting of: proteinase-k; proteinase-k and mutanolysin; and proteinase-k, mutanolysin, and an internal control DNA. The additional enzymes are often used in cell-specific lysis applications.
In other embodiments, a kit comprises: a first air-tight pouch enclosing a number of—such as 24—tubes, each tube containing lyophilized microparticles having PAMAM(0) bound thereto; a second air-tight pouch enclosing a number of reagent holders, each holder comprising: a tube containing liquid lysis reagents; a tube containing liquid wash reagents; a tube containing liquid neutralization reagents; and a tube containing liquid release reagents. Other numbers of tubes available in kit form include 12, 25, 30, 36, 48, 50, 60, and 100. Still other numbers are also permissible and consistent with the description herein.
Furthermore, in other embodiments of such a kit, the tube containing lyophilized microparticles can additionally contain particles of reagents selected from the group consisting of: proteinase-k; proteinase-k and mutanolysin; and proteinase-k, mutanolysin, and an internal control DNA. The additional enzymes are often used in cell-specific lysis applications.
Conditions of DNA Binding and Elution
One factor to consider when assessing the efficacy of a DNA-capture material is the material's pKa. The pKa of an acid, HA, is an equilibrium constant for the equilibrium
HA←→H++A−,
given by pKa=−log10 Ka, where Ka=[H+] [A−]/[HA]. It can be shown that, when the pH (=−log10 [H+]) of the solution is numerically equal to the pKa of the acid, the acid is 50% dissociated at equilibrium. Therefore, knowing the pKa of a material gives an indication of the pH, below which it is largely dissociated (in anion form), and above which it is largely unionized.
The pKa for an amino group is defined for its conjugate base, as follows: a protonated amine, R—NH3+ is in dissociative equilibrium:
R—NH3+←→H++R—NH2
and its pKa is given by −log10 Ka, where Ka=[H+] [R—NH2]/[R—NH3+].
Because a nitrogen atom is trivalent, and due to the conditions of dendrimerization, each molecule of PAMAM(0) has a mixture of primary, tertiary amine groups. Therefore, PAMAM(0) molecules exhibit multiple pK's over a range of values roughly consonant with the range of pKa's spanned by primary, and tertiary aliphatic amines, whose pKa's typically lie in the range 10-11, as evidenced by, for example, Table 12.2 of Organic Chemistry, 2nd Ed., Allinger, et al., Eds., Worth Publishers, Inc. (1976). However, according to information provided by the manufacturer of PAMAM(0), Dendritech of Midland, Mich., PAMAM is in fact likely to have pKa's in the range of 5.5 (for the tertiary amines in the interior of the molecule)-9.5 (for the primary amines on the surface of the PAMAM molecules). A journal article that references this data is Tomalia, et al., Angew. Chem. Int. Ed. Engl., 29, 138-175 (1990), at page 163, right-hand column.
PAMAM(0) is effective as a binder for DNA in the processes described herein at least in part because the amine groups of the PAMAM(0) have a pKa of between 5-9. Thus, at low pH it is typically positively charged—and may even carry multiple positive charges per molecule arising from protonations of the amine groups at pH's lower than its pKa—and is therefore able to bind strongly to polynucleotides such as DNA and RNA, which typically comprise polyanions (are predominantly negatively charged) in solution.
During the use of the PAMAM(0) molecule in the processes described herein, the pH of the binding buffer (typically TRIS) used to lyse cells at the same time as binding liberated DNA to the particles, is approximately 7-8. At this pH, all the amines (6 possible groups per PEI molecule, as available from Sigma) remain protonated (positively charged) and hence strongly attract negative charged DNA molecules to bind towards the beads.
PAMAM(0) molecules are also advantageous because they are resistant to, e.g., are immune to, degradation by lytic enzymes, protease enzymes (e.g., mixtures of endo- and exo-proteases such as pronase that cleave peptide bonds), harsh chemicals such as detergents, and heat up to 95° C., and as such are able to bind RNA and DNA during the lysis process as well. Thus, cell lysis and RNA and/or DNA binding can be combined into a single (synchronous) step, thereby both saving time and at least one processing step. The strong binding of RNA and/or DNA molecules to PAMAM(0) enables rapid washing of affinity beads coated in PAMAM(0) to remove PCR inhibitors using a wash solution. The release of RNA and/or DNA from the affinity beads is effected by an elevation of temperature in the presence of a proprietary release reagent. As the quantity of beads used is very small (<1 μl), the RNA and/or DNA can be released in a final volume as low as 3 microliters. The released RNA and/or DNA is neutralized to a final volume of 5-50 microliters using a neutralization reagent and is now ready for downstream PCR.
Typically, the amount of sample introduced is about 500 microliters or less (e.g., about 250 microliters or less, about 100 microliters or less, about 50 microliters or less, about 25 microliters or less, about 10 microliters or less). In some embodiments, the amount of sample is about 2 microliters or less (e.g., about 0.5 microliters or less).
PAMAM(0) gives excellent RNA and DNA recovery, based in part on its high binding capacity, and its high release efficiency. In general, the ratio of mass of particles to the mass of RNA or DNA retained by the particles is no more than about 25 or more (e.g., no more than about 20, no more than about 10). For example, in some embodiments, about 1 gram of particles retains about 100 milligrams of RNA or DNA; when used in smaller quantities, similar ratios can be obtained (e.g., a binding capacity of 100 μg of RNA or DNA/mg beads).
Other Apparatus for DNA Capture
In other embodiments, the solid support can be configured as a retention member (e.g., porous member such as a column, filter, a porous membrane, a microporous filter, or a gel matrix, having multiple openings such as pores and/or channels, through which RNA and/or DNA passes) through which sample material (containing the RNA and/or DNA) must pass. Such a retention member may be formed of multiple surface-modified particles constrained into a suitable geometry. In some embodiments, the retention member comprises one or more filter membranes available from, for example, Osmonics, which are formed of polymers that may also be surface-modified and used to retain RNA and/or DNA. In some embodiments, a retention member is configured as a plurality of surfaces (e.g., walls or baffles) across which a sample passes. The walls or baffles are modified to retain RNA and/or DNA in preference to, e.g., PCR inhibitors. Such a retention member is typically used when the microparticles are non-magnetic.
As a sample solution moves through a processing region containing such a retention member (suitably modified to preferentially retain RNA and/or DNA), RNA and/or DNA is retained while the liquid and other solution components (e.g., inhibitors) are less retained (e.g., not retained) and exit the processing region. Typically, such a retention member retains at least about 50% of RNA and/or DNA molecules (at least about 75%, at least about 85%, at least about 90%) of the RNA and/or DNA molecules present in the sample that entered the processing region. The processing region is typically at a temperature of about 50° C. or less (e.g., 30° C. or less) during introduction of the sample. Processing can continue by washing the retention member with a wash solution to separate remaining inhibitors from RNA and/or DNA retained by the retention member.
In some embodiments, the sample preparation processes described herein are performed within a microfluidic device, such as a microfluidic cartridge configured to receive a sample, and to capture RNA and/or DNA molecules from the sample on a solid support contained within it. Exemplary microfluidic cartridges are described in U.S. Patent Application Publication No. 2006/0166233, and WO2008/061165, both of which are incorporated herein by reference. Such cartridges may include one or more actuators configured to move microdroplets of various liquid solutions within the cartridge, a chamber configured to lyse cells in the sample, and one or more channels and associated valves configured to direct, disrupt, and divert liquid flow within the cartridge.
While sample preparation has been described as being a sequence of operations carried out in a single location, such as in a process tube or a microfluidic cartridge, other configurations can be used. For example, in some embodiments, the retention member carrying a polynucleotide-affinity material can be removed from a region where DNA and/or RNA capture occurs, for subsequent processing elsewhere. For example, the retention member may be contacted with a mixture comprising DNA and/or RNA and inhibitors in one location, and then moved to another location at which the RNA and/or DNA are removed from the retention member.
Other Advantages of the DNA Capture Material Described Herein
The extraction reagents and sample preparation processes described herein offer superior performances compared to currently available off-the-shelf kits for sample preparation. Advantages of the materials and methods herein include the following.
A streamlined sample preparation procedure having fewer steps (as few as six from raw sample to purified RNA and/or DNA) and utilizing fewer containers than other procedures.
Extraction control (cellular, plasmid, or naked) DNA can also be included along with the affinity beads. An internal control DNA can be included with the lysis reagents so that the internal control DNA gets co-purified with the other DNA (such as the target DNA) present in the clinical sample, and gets eluted amongst the final released DNA. During amplification of the eluted DNA, the internal control DNA is also amplified, and can subsequently be detected using a separate fluorophore from the target DNA. This gives an extra confirmation that the sample prep process worked as required.
The description herein has included a characterization of properties and use of microparticles coated in PAMAM(Generation 0). It would be understood by one of ordinary skill in the art that other affinity molecules may suitably be used in the processes described herein, as described elsewhere (e.g., U.S. patent application publication 2006-0166233, incorporated herein by reference).
The following six steps can be accomplished in as little as 20 minutes for a single sample, to 30 minutes for a batch of 12 samples, using a reagent kit as further described herein. The steps are also easily automated as in a system described in U.S. provisional patent application Ser. No. 60/959,437, filed Jul. 13, 2007, incorporated herein by reference. The steps are also shown, schematically, in
One exemplary process is as follows.
1. Mix ˜500 μl of the clinical sample with 500 μl of lysis buffer and magnetic affinity beads, surface-bound with PAMAM(0). Kits for detecting viruses such as EV13 include some lytic enzymes as well dissolved in the lysis buffer.
2. Incubate the mixture of sample, lysis buffer, and beads at a temperature between room temperature and 60° C. for 5-10 minutes, to lys the cells and bind the RNA and/or DNA to the affinity beads.
3. Separate the magnetic beads and remove as much of the supernatant solution as possible.
4. Wash the beads with a wash reagent.
5. Release the RNA and/or DNA from the beads by heating the beads for 3 minutes at 85° C. in the presence of as little as 3 microliters of release solution.
6. Remove the released RNA and/or DNA and neutralize the solution with a neutralization reagent, such as a Tris buffer, to create PCR-ready RNA and/or DNA.
Another exemplary process is as follows.
The procedures described herein work for a variety of sample matrices, including both clinical and non-clinical samples, as shown by the following non-exhaustive list:
Sample Preparation Pre-Processing (Only Swab Samples Require Filtration)
RNA Extraction and PCR Prep
The procedure in this example provides a method appropriate for preparing up to 50 mL of a 2×TCEP Buffer (20 mM Tris HCl pH 7.0, 2% Tx-100, 10 mM TCEP) used in RNA extractions, as further described herein. The following is a list of reagents utilized in the process.
The following is a list of equipment utilized in the process.
An operator performing this procedure must know how to prepare buffers, and possess an excellent pipetting technique, and should exercise general lab sterile techniques, prepare the solution in a laminar flow hood for sterility, and be cautious to not contaminate stock reagents. Gloves and lab coat should be worn by operator at all times.
This procedure provides an appropriate method for one batch of PAMAM(G0) coated magnetic microspheres, commonly referred to as Magnetic RNA-Affinity Microspheres. One batch consists of 1-10 ml synthesis resulting in 6 mL of magnetic RNA affinity microspheres. A flow-chart of the process is shown in
An operator performing this procedure must be competent with a microbalance, pipettors, pH meter, ultrasonic dimembrator and a microcentrifuge, and must know how to prepare buffers and possess an excellent pipetting technique. Gloves, labcoat, and eye protection should be worn by the operator at all times. Ear protection must be worn during sonication steps. All solutions are prepared in a laminar flow hood.
Steps to be performed on Day 1, include the following.
Steps to be performed on Day 2, include the following.
The foregoing description is intended to illustrate various aspects of the instant technology. It is not intended that the examples presented herein limit the scope of the appended claims. The invention now being fully described, it will be apparent to one of ordinary skill in the art that many changes and modifications can be made thereto without departing from the spirit or scope of the appended claims.
This application is a continuation of U.S. application Ser. No. 16/818,458, filed on Mar. 13, 2020, which is a continuation of U.S. application Ser. No. 16/158,752, filed on Oct. 12, 2018 (now U.S. Pat. No. 10,590,410), which is a continuation of U.S. application Ser. No. 14/976,746, filed on Dec. 21, 2015 (now U.S. Pat. No. 10,100,302), which is a continuation of U.S. application Ser. No. 14/262,525, filed on Apr. 25, 2014 (now U.S. Pat. No. 9,217,143), which is a continuation of U.S. application Ser. No. 13/692,980, filed on Dec. 3, 2012 (now U.S. Pat. No. 8,710,211), which is a continuation of U.S. application Ser. No. 12/172,214, filed on Jul. 11, 2008 (now U.S. Pat. No. 8,324,372), which claims the benefit of priority under 35 U.S.C. § 119(e) to U.S. Provisional Application Ser No. 60/959,437, filed Jul. 13, 2007, all of which are incorporated herein by reference in their entirety.
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| Transcript of Deposition of Bruce K. Gale, Ph.D., in Support of Patent Owner's Responses (Exhibit 2012 in IPR2019-00488 and IPR2019-00490), taken Sep. 24, 2019 (124 pages). |
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| Petition for Inter Partes Review of U.S. Pat. No. 8,803,069 (Paper 3 in IPR2020-01100) dated Jun. 12, 2020 (83 pages). |
| Declaration of Mark A. Burns, Ph.D. (Exhibit N1001 in IPR2020-01083, IPR2020-01091, IPR2020-01095 and IPR2020-01100) dated Jun. 12, 2020 (378 pages). |
| Petition for Inter Partes Review of U.S. Pat. No. 8,709,787 (Paper 2 in IPR2020-01132) dated Jun. 18, 2020 (96 pages). |
| Petition for Inter Partes Review of U.S. Pat. No. 8,415,103 (Paper 2 in IPR2020-01133) dated Jun. 18, 2020 (96 pages). |
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| Petition for Inter Partes Review of U.S. Pat. No. 8,415,103 (Paper 2 in IPR2020-01136) dated Jun. 19, 2020 (85 pages). |
| Petition for Inter Partes Review of U.S. Pat. No. 8,709,787 (Paper 2 in IPR2020-01137) dated Jun. 19, 2020 (86 pages). |
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| Judgment/Final Written Decision Determining No Challenged Claims Unpatentable in Inter Partes Review of U.S. Pat. No. 7,998,708 (Paper No. 52 in IPR2019-00488) dated Jul. 14, 2020 (43 pages). |
| Judgment/Final Written Decision Determining No Challenged Claims Unpatentable in Inter Partes Review of U.S. Pat. No. 8,323,900 (Paper No. 51 in IPR2019-00490) dated Jul. 14, 2020 (43 pages). |
| Petitioner's Notice of Appeal in Inter Partes Review of U.S. Pat. No. 7,998,708 (Paper No. 54 in IPR2019-00488) dated Sep. 9, 2020 (48 pages). |
| Petitioner's Notice of Appeal in Inter Partes Review of U.S. Pat. No. 8,323,900 (Paper No. 53 in IPR2019-00490) dated Sep. 9, 2020 (48 pages). |
| Patent Owner's Preliminary Response to Petition for Inter Partes Review of U.S. Pat. No. 8,703,069 (Paper 13 in IPR2020-01095) dated Sep. 17, 2020 (77 pages). |
| Patent Owner's Preliminary Response to Petition for Inter Partes Review of U.S. Pat. No. 8,273,308 (Paper 13 in IPR2020-01091) dated Sep. 17, 2020 (70 pages). |
| Patent Owner's Preliminary Response to Petition for Inter Partes Review of U.S. Pat. No. 8,703,069 (Paper 14 in IPR2020-01100) dated Sep. 17, 2020 (59 pages). |
| Declaration of M. Allen Northrup, Ph.D. in Support of Patent Owner Preliminary Responses in IPR2020-01091, IPR2020-01095 and IPR2020-01100 (Exhibit H2003) dated Sep. 16, 2020 (137 pages). |
| Patent Owner's Preliminary Response to Petition for Inter Partes Review of U.S. Pat. No. 8,273,308 (Paper 13 in IPR2020-01083) dated Oct. 22, 2020 (88 pages). |
| Declaration of M. Allen Northrup, Ph.D. in support of Patent Owner Preliminary Responses in IPR2020-01083, IPR2020-01091, IPR2020-01095 and IPR2020-01100 (Exhibit H2003) dated Oct. 21, 2020 (171 pages). |
| First Amended and Supplemental Complaint filed by Becton, Dickinson and Company et al. on Jun. 25, 2020 in U.S. District Court, Delaware, Case #1:19-cv-01126-LPS, Infringement Action involving U.S. Pat. Nos. 7,998,708; 8,273,308; 8,323,900; 8,415,103; 8,703,069; 8,709,787; 10,494,663; 10,364,456; 10,443,088; 10,604,788; 10,625,261; 10,625,262; and 10,632,466 (55 pages). |
| Answer to First Amended and Supplemental Complaint filed by NeuModx Molecular, Inc. on Jul. 16, 2020 in U.S. District Court, Delaware, Case #1:19-cv-01126-LPS (42 pages). |
| Defendant NeuModx's Initial Invalidity Contentions filed Sep. 30, 2020 in U.S. District Court, Delaware, Case #1:19-cv-01126-LPS (47 pages). |
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| Petition for Inter Partes Review of U.S. Pat. No. 10,625,261 (Paper 2 in IPR2021-00251) dated Nov. 25, 2020 (117 pages). |
| Petition for Inter Partes Review of U.S. Pat. No. 10,632,466 (Paper 2 in IPR2021-00253) dated Nov. 25, 2020 (121 pages). |
| Declaration of Mark A. Burns, Ph.D. (Exhibit N1001 in IPR2021-00250, IPR2021-00251 and IPR2021-00253) dated Nov. 24, 2020 (311 pages). |
| Declaration of James L. Mullins, Ph.D. (Exhibit N1029 in IPR2021-00250, IPR2021-00251, and IPR2021-00253) dated Nov. 18, 2020 (54 pages). |
| Decision Denying Institution of Inter Partes Review of U.S. Pat. No. 8,273,308 (Paper 14 in IPR2020-01091) dated Dec. 4, 2020 (21 pages). |
| Decision Denying Institution of Inter Partes Review of U.S. Pat. No. 8,703,069 (Paper 14 in IPR2020-01095) dated Dec. 4, 2020 (22 pages). |
| Decision Denying Institution of Inter Partes Review of U.S. Pat. No. 8,703,069 (Paper 15 in IPR2020-01100) dated Dec. 4, 2020 (19 pages). |
| Defendant NeuModx's Joint Claim Construction Chart [Exhibit N1023] filed Oct. 21, 2020 in U.S. District Court, Delaware, Case #1:19-cv-01126-LPS (25 pages). |
| Defendant NeuModx's Initial Amended Answer, Affirmative Defenses, and Counterclaims to Plaintiffs' First Amended and Supplemental Complaint filed Nov. 23, 2020 in U.S. District Court, Delaware, Case #1:19-cv-01126-LPS (97 pages). |
| Number | Date | Country | |
|---|---|---|---|
| 20200291388 A1 | Sep 2020 | US |
| Number | Date | Country | |
|---|---|---|---|
| 60959437 | Jul 2007 | US |
| Number | Date | Country | |
|---|---|---|---|
| Parent | 16818458 | Mar 2020 | US |
| Child | 16890752 | US | |
| Parent | 16158752 | Oct 2018 | US |
| Child | 16818458 | US | |
| Parent | 14976746 | Dec 2015 | US |
| Child | 16158752 | US | |
| Parent | 14262525 | Apr 2014 | US |
| Child | 14976746 | US | |
| Parent | 13692980 | Dec 2012 | US |
| Child | 14262525 | US | |
| Parent | 12172214 | Jul 2008 | US |
| Child | 13692980 | US |
