WO2009123347A1 - ウイルス定量法 - Google Patents
ウイルス定量法 Download PDFInfo
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- WO2009123347A1 WO2009123347A1 PCT/JP2009/057039 JP2009057039W WO2009123347A1 WO 2009123347 A1 WO2009123347 A1 WO 2009123347A1 JP 2009057039 W JP2009057039 W JP 2009057039W WO 2009123347 A1 WO2009123347 A1 WO 2009123347A1
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- virus
- carrier
- lectin
- hhv
- collected
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Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
- G01N33/48—Biological material, e.g. blood, urine; Haemocytometers
- G01N33/50—Chemical analysis of biological material, e.g. blood, urine; Testing involving biospecific ligand binding methods; Immunological testing
- G01N33/53—Immunoassay; Biospecific binding assay; Materials therefor
- G01N33/569—Immunoassay; Biospecific binding assay; Materials therefor for microorganisms, e.g. protozoa, bacteria, viruses
- G01N33/56983—Viruses
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2333/00—Assays involving biological materials from specific organisms or of a specific nature
- G01N2333/005—Assays involving biological materials from specific organisms or of a specific nature from viruses
- G01N2333/01—DNA viruses
- G01N2333/03—Herpetoviridae, e.g. pseudorabies virus
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2333/00—Assays involving biological materials from specific organisms or of a specific nature
- G01N2333/195—Assays involving biological materials from specific organisms or of a specific nature from bacteria
- G01N2333/36—Assays involving biological materials from specific organisms or of a specific nature from bacteria from Actinomyces; from Streptomyces (G)
Definitions
- the present invention relates to a method for quantifying the number of human herpesvirus (HHV) collected from a body fluid, and a kit for performing the method.
- HHV human herpesvirus
- the main cause of the delay in research and prevention / treatment of “fatigue” is that there is no method for objectively measuring “fatigue”.
- saliva is preferably used as a sample, but it has been known that salivary gland has a high endogenous piotin content in the salivary glands (Green, M., et a., J. Cl in Pathol., (1992) 45 (9): 788-790).
- a method for quantifying viruses a method for quantifying viral DNA by PCR (Kido, S., et al., J. Med. Vi rol., (1990) 32: 139-142), double-nested PCR The method (Kondo, K ⁇ , et al., J. Infect. Dis., (1993) 167: 1197-1200) etc. which measure by the method (Double-Nested PCR) are known.
- a method for the quantification of retroviruses a method is also disclosed in which a retrovirus containing a viral nucleic acid containing a labeled sequence is used as an internal standard when the amount of viral DNA is measured by quantitative PCR (W095 / 034684).
- an immunoassay method (Immunoassay method) using an antibody against the viral protein.
- the sandwich EL ISA method can be mentioned (Gerna, G., et al., J. Clin. Microbiol., (1983) 17: 942—944).
- the method of increasing the virus concentration in the solution and concentrating the virus is, for example, the m heart method, but this method requires expensive equipment and a long separation time, and requires a lot of labor for the work. It becomes.
- there is a method of precipitating the virus with ammonium glycol sulfate and concentrating it but in these methods, the reagents used inhibit the PCR for subsequent virus detection, so the sample is purified after virus precipitation. There was a problem that it was necessary.
- a method using magnetic particles bound with mannose-binding lectin has been disclosed (Japanese Patent Laid-Open No. 2002-165591).
- Patent Document 1 International Publication No. W02006 / 006634 Pamphlet
- Patent Document 2 Pamphlet of International Publication No. W095 / 034684
- Patent Document 3 Japanese Patent Application Laid-Open No. 2002-165591
- Patent Document 4 International Publication No. W02001 / 079456 Pamphlet
- Non-Patent Document 1 Green, M., et al., J. Clin. Pathol., (1992) 45 (9): 788-790
- Non-Patent Document 2 Kido, S., et al., J. Med. Virol. , (1990) 32: 139-142
- Non-patent literature 3 Kondo, K., et al., J. Infect. Dis., (1993) 167: 1197-1200
- Non-patent literature 4 Gerna, G., et al., J. Clin. Microbiol., (1983 17: 942-944 Summary of the Invention
- HHV human herpesvirus
- the present inventors have mixed a carrier combined with a substance capable of binding to HHV in a body fluid to bind to the target virus, and recovered the carrier by a magnet or centrifugation.
- concentration could be easily quantified by PCR, LAMP, ELISA, and the like.
- the present inventors succeeded in performing accurate quantification by performing a series of steps by adding a certain amount of reference virus to, during the quantification process.
- this method it was possible to perform simpler and more accurate quantification by using mutant HHV as a reference virus.
- the present invention provides a novel quantification method that enables simpler and more accurate measurement of HHV in sputum, and a kit for performing the method of the present invention. That is, the present invention is as follows.
- a method for quantifying the number of human herpesviruses collected from a body fluid comprising the following steps:
- the solution of (1) is brought into contact with a virus-binding substance, where (i) the virus-binding substance is linked to a molecule that can bind to the carrier, and is further bound to the carrier via the molecule.
- the virus bound to the virus-binding substance indirectly binds to the carrier, or (ii) the virus-binding substance is directly bound to the carrier, so that the virus bound to the virus-binding substance is bound to the carrier.
- the recovery rate was evaluated by comparing the number of recovered reference viruses with the number of reference viruses added in (1). From the number of human herpesviruses quantified in (4) and the recovery rate, Determine the number of chick herpesviruses collected; Including the method.
- a method for quantifying the number of human herpesviruses collected from a body fluid comprising the following steps:
- the recovery rate was evaluated by comparing the number of recovered reference viruses with the number of reference viruses added in (1). From the number of human herpesviruses quantified in (4) and the recovery rate, Determine the number of human herpesviruses collected;
- a method for quantifying the number of human herpesviruses collected from saliva comprising the following steps:
- the recovery rate was evaluated by comparing the number of recovered reference viruses with the number of reference viruses added in (1). From the number of human herpesviruses quantified in (4) and the recovery rate, Determine the number of chick herpesviruses collected;
- Aspect 4 The person according to any one of aspects 1 to 3, wherein the human herpesvirus is human herpesvirus 6 (HHV-6) or human herpesvirus 7 (HHV-7) Law.
- Aspect 5 The method according to any one of aspects 1 to 3, wherein the reference virus is a recombinant virus derived from HHV-6 or HHV-7.
- the lectin contains at least one of N-acetyl galactosamine (GalNAc), ⁇ 2-6 linked sialic acid (Siaa2-6), and N-acetyl darcosamine (G l cNAc).
- Aspect 7 The method according to Aspect 6, wherein the lectin is selected from the group consisting of SBA (derived from soybean), SSA (derived from two-spotted licorice), DSA (derived from datura), and WGA (derived from wheat germ).
- SBA derived from soybean
- SSA derived from two-spotted licorice
- DSA derived from datura
- WGA derived from wheat germ
- Embodiment 8 The method according to any one of embodiments 1 to 3, wherein step (4) comprises quantifying the number of viruses by a method selected from the group consisting of PCR, LAMP, and ELISA.
- a method for quantifying the number of human herpesvirus 6 (HHV-6) or human herpesvirus 7 (HHV-7) collected from saliva comprising the following steps:
- the pictinated lectin with the solution in (1), bring the virus into contact with the piotinated lectin, add beads that bind to the piotin-binding protein, and then add the virus that binds to piotin-lectin to the beads.
- the lectin is selected from the group consisting of SB A (from soybean), SSA (from Nihontoko), DSA (from Datura), and WGA (from wheat germ) force;
- the number of viruses recovered from the separated beads is quantified by a method selected from the group consisting of PCR, LAMP, and ELISA:
- the recovery rate was evaluated by comparing the number of recovered reference viruses with the number of reference viruses added in (1). From the number of human herpesviruses quantified in (4) and the recovery rate, Determine the number of flu herpesviruses collected; Including the method.
- Aspect 10 A method for quantifying the number of human herpesviruses collected from, comprising the following steps:
- the recovery rate was evaluated by comparing the number of recovered reference viruses with the number of reference viruses added in (1). From the number of human herpesviruses quantified in (4) and the recovery rate, Determine the number of human herpesviruses collected;
- a kit for quantifying the number of human herpesviruses collected from a body fluid comprising:
- a kit for quantifying the number of leopard herpesvirus collected from a body fluid comprising:
- the lectin contains at least one of N-acetyl galactosamine (GalNAc), ⁇ 2-6 conjugated sialic acid (S ia ⁇ 2-6), and ⁇ -acetyl darcosamine (GlcNAc).
- the lectin is selected from the group consisting of SBA (derived from soybean), SSA (derived from two-spotted toco), DS A (derived from datura), and WGA (derived from wheat germ).
- the reference virus is a recombinant virus derived from HHV-6 or HHV-7;
- a method for quantifying the number of human herpesviruses collected from ⁇ liquid comprising the following steps:
- the collected sickle is brought into contact with a virus-binding substance, where (i) the virus-binding substance is linked to a molecule that can bind to the carrier, and is further bound to the carrier via the ⁇ .
- the virus bound to the virus-binding substance indirectly binds to the carrier, or (ii) the virus-binding substance is directly bound to the carrier, so that the virus bound to the virus-binding substance binds to the carrier.
- Aspect 16 Method for quantifying the number of human herpesviruses collected from saliva, comprising the following steps:
- the concentration in the body fluid is very low, and the quantification is not easy if it is as it is.
- the quantification of HHV that requires skill can be performed easily and more accurately.
- Figure 1 is a fluorescence micrograph showing the results of testing for nonspecific adsorption of HHV-6 to tamavidin beads.
- the green light points indicate that EGFP recombinant HH V-6 is infected with MT-4 cells, one of the Indike overnight cells, and one dot represents one infectious virus particle ( The difference in brightness at each point is due to the difference in viral gene expression after infection. is there).
- the photo on the left shows the case where HHV-6 virus solution (stock solution) was allowed to act on MT-4 cells.
- the photo on the right shows the case where HHV-6 virus solution (stock solution) was contacted with evening mavidin beads in the absence of lectin, and the virus adsorbed on tamavidin beads was allowed to act on MT-4 cells.
- FIG. 2 is a fluorescence micrograph showing the results of testing the effect of HHV-6 on the lectins ABA, DSA, Lotus, MAM, and PHA-E4.
- the dots that glow in green indicate that EGFP recombinant HHV-6 is infected with MT-4 cells, which are indigenous overnight cells, and one dot represents one infectious virus particle (each The difference in brightness of the spots is due to the difference in viral gene expression after infection).
- Figure 3 shows HH with PHA—L4, UEA—I, SBA, and S S A lectins.
- the present invention is a method for quantifying the number of human herpesviruses collected from a body fluid, comprising the following steps:
- the collected body fluid is brought into contact with a virus-binding substance, where (i) the virus-binding substance is linked to a molecule that can bind to the carrier, and is further bound to the carrier via the molecule.
- the virus bound to the virus-binding substance indirectly binds to the carrier, or (ii) the virus-binding substance is directly bound to the carrier, so that the virus bound to the virus-binding substance binds to the carrier.
- the method is provided.
- the present invention is a method for quantifying the number of human herpesviruses collected from a body fluid, The following steps:
- the solution of (1) is brought into contact with a virus-binding substance, wherein (i) the virus-binding substance is linked to the carrier so that it can bind to the carrier, and further, by binding to the carrier via the molecule.
- the virus bound to the virus-binding substance indirectly binds to the carrier, or (ii) the virus-binding substance is bound directly to the carrier, so that the virus bound to the virus-binding substance binds to the carrier.
- the recovery rate was evaluated by comparing the number of recovered reference viruses with the number of reference viruses added in (1). From the number of human herpesviruses in the body fluid determined in (4) and the recovery rate, Determine the number of human herpesviruses collected from body fluid force;
- the method is provided.
- the virus to be quantified in the method of the present invention is a virus capable of quantifying baboon fatigue, and specifically, a virus belonging to the Herpesviridae that infects humans, that is, human herpes.
- Pesvirus (hereinafter also referred to as HHV).
- human herpesvirus 6 variant A and B of human herpesvirus 6: hereinafter also referred to as HHV-6
- human herpesvirus 7 hereinafter also referred to as HHV-7
- Human herpesvirus is a double-stranded DNA virus that infects humans.
- HHV-6 is a virus with a diameter of about 200 nm.
- Body fluids to be analyzed by the method of the present invention are blood, saliva, serum, semen, breast milk, and pharyngeal wipes. It can be any fiber collected from the human body, such as cervical fluid, brain fluid, ascites, sweat, tears, urine, etc. Saliva is preferred. In the present specification, the body fluid to be analyzed by the method of the present invention may be simply referred to as “sample”.
- Examples of the method for collecting saliva include a method of wiping the viscous fluid of the pharynx with a cotton swab, a method of directly discharging saliva to the collection tube, a method of using a saliva collection device such as salivette (Sarusutsu 3 ⁇ 4) and the like.
- a method using a salivet is preferred.
- saliva is collected by putting cotton in the mouth and letting saliva soak into the cotton, and then transferring the cotton soaked in saliva to a centrifuge tube and centrifuging it.
- oral treatment before collecting saliva includes, for example, a method of resting without eating for a long time or a method of rinsing the oral cavity with water immediately before collecting saliva.
- the rinse method is preferred.
- body fluids other than saliva can be collected by methods known to those skilled in the art. As long as the collected body fluid does not affect the quantification of virus particles and virus DNA, it may be subjected to appropriate treatments such as dilution, filtration, and centrifugation before measurement. Alternatively, if virus quantification is not performed immediately, it may be refrigerated or cryopreserved by methods known to those skilled in the art as needed until measurement.
- the virus-binding substance refers to a substance that can bind to HHV.
- Substances that can bind to HHV include lectins and antibodies to HHV.
- lectin refers to a sugar-binding protein that recognizes and binds to a sugar chain.
- the sugar chain to which the lectin binds has specificity for each lectin.
- the lectin used in the present invention is not particularly limited as long as it can bind to HHV, but preferably has a high affinity with the virus to be quantified and a high recovery rate of the virus. More preferably, N-acetyl galactosamine (G al NA c;), sialic acid with 2-6 linkage (S ia ⁇ 2-6)> less ⁇ -acetyl darcosamine (G 1 c NA c) More preferably, it is a lectin that binds to a sugar chain containing one, and more preferably SBA (soybean-derived lectin.
- SBA sibean-derived lectin.
- Linked sugar chain sugar chain containing N-acetylylgalactosamine (G al NA c)), SSA (derived from Nihon Nikko) Lectin Binding sugar chain: ⁇ 2 _ 6-linked sialic acid (S ia ⁇ 2— 6) sugar chain containing), DSA (Datura-derived lectin. Binding sugar chain: N-acetylyl darcosamine (G lc NA c) containing sugar chain), and WGA (wheat germ-derived lectin. Binding sugar chain: N—A A lectin selected from the group consisting of cetyldarcosamine (G lcNAc) or a sugar chain containing sialic acid). In particular, SBA and WG A are more preferred when the virus to be quantified is HHV-6.
- the antibody against HHV used in the present invention is not particularly limited as long as it can bind to HHV, and may be either a polyclonal antibody or a monoclonal antibody.
- the virus-binding substance may be used by directly binding to a carrier.
- the virus-binding substance may be used indirectly bound to a carrier.
- An example of indirect binding is the binding of a virus binding substance and a carrier through the binding of piotin and a pyotin binding protein. More specifically, the virus-binding substance and the carrier are indirectly bound by piotinizing the virus-binding substance and binding the protein to the surface of the carrier and binding the protein to the protein. Bonding can be achieved.
- the carrier is not particularly limited as long as it is a solid or insoluble material (for example, a material that can be separated from the reaction mixture by filtration, application, magnetic separation, etc.).
- Materials that make up the solid support are cellulose, Teflon (registered trademark), nitrocellulose, agarose, highly cross-linked spherical agarose, dextran, chitosan, polystyrene, polyacrylamide, polyester, polycarbonate, polyamide, polypropylene, naycan, polydivinylidene Fluoride, Latex, Silica, Glass, Glass, Gold, Platinum, Silver, Copper, Iron, Stainless steel, Ferrite, Silicon wafer, Polyethylene, Polyethyleneimine, Polylactic acid, Resin, Polysaccharide, Protein (albumin etc.), Including but not limited to carbon or combinations thereof.
- Solid carrier shapes include but are not limited to beads, magnetic beads, thin films, tubules, filters, plates, microplates, carbon nanotubes, sensor chips, etc. As is known in the art, G, groove, filter bottom, etc. may be provided.
- the magnetic 14 beads may have a sphere diameter ranging from about 10 nm to about 1 mm. In preferred embodiments, the magnetic beads have a diameter in the range of about 25 nm to about 1 mm, about 50 nm to about 100 Hm. The size of the magnetic beads can be selected depending on the particular application. In one embodiment of the invention, beads composed of highly cross-linked spherical agarose, such as Sepharose, can have a diameter in the range of about 24 / m to about 1665 m. In a preferred embodiment, the highly crosslinked spherical agarose beads have a diameter in the range of about 24 / m to about 44 m. The size of the highly crosslinked spherical agarose beads can be selected depending on the particular application.
- solid supports having a hydrophobic surface examples include polystyrene latex beads such as those commercially available from Polysciences or Spherotech.
- silica (S i 0 2 ) -treated or silica (S i O 2 ) based solid supports examples include superparamagnetic silica beads available from Polysciences. Alternatively, M_280, etc. commercially available from Dynal Biotech can also be used.
- magnétique beads having a hydrophilic surface examples include beads commercially available from Polysciences under the name B i om ag® Rupoxyl or Peas from Bangs Laboratory (MC O 2 N / 2 9 2 8) Etc. Alternatively, M-270 or the like commercially available from Dynal Biotech can be used.
- the virus-binding substance and the carrier can be used by directly binding to each other.
- the carrier is a nanobead having a size capable of Brownian motion.
- the preferred sphere diameter range of the nanobeads is 10 nm to: sphere diameter of L 00 nm, more preferably sphere diameter of 30 nm to 70 nm.
- magnetic nanobeads such as MACS MicroBeads (diameter 50 nm) of Miltenyi Biotech. Is mentioned.
- the virus-binding protein and carrier can be linked using a protein-carrier coupling method known to those skilled in the art.
- the carrier surface is modified so that the carboxyl group is exposed, and
- the protein and carrier can be linked by coupling the amino group of the protein in the presence of the crosslinking agent 11-ethyl-3_ (3-dimethylaminopropyl) carpositimide (EDC).
- EDC crosslinking agent 11-ethyl-3_ (3-dimethylaminopropyl) carpositimide
- NHS N-hydroxysuccinimide
- the cross-linking reagent BS 3 bis [sulfosuccinimidyl] suberate) or DS S (disuccinimidyl suberate) can be used to replace the carrier surface and amino protein groups, or the cross-linking reagent.
- SPDP N-succinimidyl 3- [2-pyridyldithio] propionate
- GMBS N- (4-maleimidobutyryloxy) succinimide
- the virus-binding substance may be used indirectly bound to a carrier.
- indirect binding of a virus-binding substance and a carrier is achieved by piotating a virus-binding substance, binding a protein that binds to the surface of the carrier, and binding the protein to the protein. it can.
- beads can be preferably used as the carrier, but the preferred sphere diameter range of the beads is 0.1 zm to: L 00 zm sphere diameter, more preferably 0.5 ⁇ m to 10 m.
- Piotin is the general name for D — [(+) — cis-hexahydro-2-year-old xo-1H-thieno- (3,4) -imidazole 4-valeric acid]. .
- Piotin is a type of water-soluble vitamin classified into the vitamin B group, sometimes called vitamin B 7 , or sometimes called vitamin H or coenzyme R. Piotin binds very strongly to avidin, a glycoprotein contained in egg white.
- “piotin” means iminobiotin (Hofmann, et al., (1980) Proc. Natl. Acad. Sci. USA, 77: 4666- 4668), desthiobiotin ( desthiobiotin) (Hirsch, et al., (2002) Anal. Biochem., 308: 343-357), or other biotins such as biocytin and biotin sulfoxide.
- PI ERCE manufactured by PI ERCE (linker length, reactive group in Katsuko)
- EZ-Link registered trademark Sulfo- HS-Biotin (13.5 A, primary amine
- EZ-Link (Registered trademark) Sulfo- HS-LC-Biotin (22.
- piotinizing reagent it is possible to bind piotin to a virus-binding substance such as lectin using a known method.
- a piotination reagent containing NHS ester dissolve it in an organic solvent such as DMSO (dimethyl sulfoxide) or a pH 7_9 phosphate buffer, and add it to a virus-binding substance such as lectin.
- a virus-binding substance such as lectin.
- Piotin can be bound.
- a piotation reagent containing an amino group use a calpositimide such as EDC (1-ethyl-3- (3-dimethylaminopropyl) carpositimide / hydride chloride).
- EDC 1-ethyl-3- (3-dimethylaminopropyl) carpositimide / hydride chloride
- a piotination reagent dissolved in a buffer solution having a pH of about 5 may be added to bind the piotine.
- a virus-binding substance such as lectin to which piotin is bound may be purchased from J-0il Mills as a piotin-labeled lectin.
- a biotin labeling kit such as, but not limited to, EZ-Unk (registered trademark) NHS-Lc-Biotin manufactured by Pierce or Biotin Labeling Kit-NH2 manufactured by Dojindo Molecular Technologies
- EZ-Unk registered trademark
- NHS-Lc-Biotin manufactured by Pierce or Biotin Labeling Kit-NH2 manufactured by Dojindo Molecular Technologies
- a gene for a virus-binding substance such as a lectin is fused with a DNA encoding a peptide containing a piotinization sequence, and a vector that expresses this fusion gene is constructed.
- a pyotinylated lectin may be prepared by expression as a fusion protein of (Schwarz et al., (1988). J. Biol. Chem. 263: 9640-9645).
- Examples of such vectors include, but are not limited to, vectors containing Invitrogen's BioE ase TM tag.
- examples of the piotine-binding protein include avidin, streptavidin, neutravidin, AVR protein (Biochem. L, (2002), 363: 609-617), bradavidin (J. Biol. Chem., (2005), 280: 13250-13255), Rhizavidin (Biochem. J., (2007), 405: 397-405), tamavidin and their mutants, such as a protein that binds piotin and piotin Z avidin. Any of these can be suitably used. In particular, evening mavidin and its mutants can be preferably used.
- evening mavidin is a piotin-binding protein discovered from the edible mushroom Pleurotus conucopiae (W002 / 072817; Takakura et al., (2009) FEBS J., 276: 1383-1397 ).
- tamavidin mutants include high binding ability and low non-specific binding tamavidin (Japanese Patent Application No. 2008-208766 unpublished).
- evening mavidin refers to evening mavidin 1 (amino acid sequence: SEQ ID NO: 11, nucleic acid sequence encoding it: SEQ ID NO: 10), evening mavidin 2 (amino acid sequence: SEQ ID NO: 13, nucleic acid sequence encoding the same: SEQ ID NO: 12) or a variant thereof.
- the evening mavidin of the present invention typically comprises a protein comprising the amino acid sequence of SEQ ID NO: 11 or SEQ ID NO: 13, or a nucleic acid comprising the base sequence of SEQ ID NO: 10 or SEQ ID NO: 12. The encoded protein.
- the evening mavidin of the present invention is encoded by a protein comprising the amino acid sequence of SEQ ID NO: 11 or SEQ ID NO: 13, or a nucleic acid comprising the base sequence of SEQ ID NO: 10 or SEQ ID NO: 12.
- evening mavidin 1, evening mavidin 2, and variants thereof may be collectively referred to simply as evening mavidin.
- a variant of Mavidin 1 or 2 is a protein comprising an amino acid sequence containing one or more amino acid deletions, substitutions, insertions, and additions or additions in the amino acid sequence of SEQ ID NO: 1 1 or 13 It may be a protein having a piotin binding activity similar to that of Mavidin 1 or 2.
- the substitution may be a conservative substitution, which is the replacement of a particular amino acid residue with a residue having similar physicochemical characteristics.
- Non-limiting examples of conservative substitutions include substitutions between aliphatic group-containing amino acid residues, such as I 1 e, V a 1, 61 or 8 1a mutual substitution, L ys and Substitutions between polar residues such as mutual substitution of A rg, G 1 u and A sp, G 1 n and A sn are included.
- Mutations due to amino acid deletions, substitutions, insertions and additions can be performed on the DNA encoding the wild-type protein, for example, by site-directed mutagenesis (eg, ucleic Acid Research, Vol. 10, No. 20). , p. 6487-6500, 1982, the entire contents of which are incorporated herein by reference).
- site-directed mutagenesis eg, ucleic Acid Research, Vol. 10, No. 20. , p. 6487-6500, 1982, the entire contents of which are incorporated herein by reference.
- “one or more amino acids” means amino acids that can be deleted, substituted, inserted and Z or added by site-directed mutagenesis. In the present specification, “one or more amino acids” may mean one or several amino acids depending on circumstances.
- the tamavidin 1 or 2 variant further comprises at least 60%, preferably 65% or more, 70% or more, 75% or more, 80% or more of the amino acid sequence of SEQ ID NO: 1 1 or 13 85% or more, 90% or more, 95% or more, 96% or more, 97% or more, 98% or more, or 99% or more, more preferably 99.3% or more of amino acid H4 It may be a protein having an amino acid sequence having a piotin-binding activity similar to that of tamavidin 1 or 2, or a protein having a high binding ability / low non-specific binding activity .
- the percent identity between two amino acid sequences may be determined by visual inspection and mathematical calculations. Alternatively, the percent identity between two protein sequences may be determined by Needleman, SB and Wunsch, CD (J. Mol. Biol , 8: 443-453, 1970) and It may be determined by comparing sequence information using the GAP computer program available from the University of Wisconsin Genetics Computer Group (UWGCG). Preferred default parameters for the GAP program include: (1) Henikoff, S. and Henikoff, JG (Proc. Natl. Acad. Sci. USA, 89: 10915-10919, 1992), Scoring matrix, blos um62; (2) 12 gap weights; (3) 4 gap length weights; and (4) No penalty for end gaps.
- the 14th percentile can be determined by comparing the sequence information with the BLAST program described in Altschul et al. (Nucl. Acids. Res., 25, p.3389-3402, 1997). Is possible.
- the program can be used on the Internet from the website of the National Center for Biotechnology Information (NCBI) or DM Data Bank of Japan (DDBJ).
- NCBI National Center for Biotechnology Information
- DDBJ DM Data Bank of Japan
- Various conditions (identity of parameters) for identity search using the BLAST program are described in detail on the site, and some settings can be changed as appropriate, but the search is usually performed using default values. Do.
- the same H4% of the two amino acid sequences may be determined by using a program such as genetic information processing software GENETYX Ver. 7 (manufactured by Genetics) or the FASTA algorithm. In this case, the default value may be used for the search.
- the percent identity between two nucleic acid sequences can be determined by visual aversion and mathematical calculation, or more preferably, this comparison is made by comparing the sequence information using a computer program.
- a typical, preferred computer's program is the GAP, a Wisconsin package from the Genetics Combining Group (GCG; Madison, Wis.), Version 10.0 program (Devereux, et al., 1984, Nucl. Acids Res., 12: 387).
- GAP Genetics Combining Group
- preferred tamavidins include the following evening mavidin variants. (Japanese Patent Application No. 2008-208766 not published). Including the amino acid sequence set forth in SEQ ID NO: 13 or an amino acid sequence having 1 to several amino acid variations in this sequence, or an amino acid sequence having 80% or more identity with this sequence, In the proteins shown, the following groups
- a modified piotin-binding protein wherein one or more residues selected from are substituted with acidic amino acid residues or neutral amino acid residues.
- the 104th arginine residue is substituted with a glutamic acid residue
- the 14th 1st lysine residue is substituted with a glutamic acid residue.
- Piotin binding protein (R 1 0 4 E— K 1 4 1 E);
- SEQ ID NO: 1 a modified piotin-binding protein in which the 40th aspartic acid residue is substituted with an asparagine residue, and 1 4 1st lysine residue is substituted with a glutamic acid residue D 4 0 N_K 1 4 1 E);
- the 40th aspartic acid residue is substituted with an asparagine residue
- the 10th 4th arginine residue is substituted with a glutamic acid residue
- a modified piotin-binding protein selected from the group consisting of
- the linking of the piotin-binding protein and the carrier can be performed using a protein-carrier coupling method known to those skilled in the art.
- the carrier surface is modified so that the carboxyl group is exposed, and the carboxyl group and the amino group of the protein are combined in the presence of 1-ethyl-3- (3-dimethylaminopropyl) carpositimide (EDC), which is a cross-linking reagent.
- EDC 1-ethyl-3- (3-dimethylaminopropyl) carpositimide
- a protein and a carrier can be linked by a coupling reaction.
- carrier By mixing the carrier whose surface carboxyl group is activated with N-hydroxysuccinimide (NHS) and protein in a buffer solution of pH 6.5 to 9 containing no primary amino group, the carboxyl group on the carrier surface is mixed. And the amino group of the protein can be linked.
- NHS N-hydroxysuccinimide
- cross-linking reagent B S3 bis [sulfosuccinimidyl] suberate
- DSS disuccinimidyl suberate
- the carrier surface amino group and protein amino group or cross-linking reagent SPDP
- N-succinimidyl 3- [2-pyridyldithio] propionate or GMBS (N- (4-maleimidobutyryloxy) succinimide
- the amino group on the carrier surface can be linked to the thiol group of the protein.
- the microplate on which the functional group is arranged on the surface is, for example, a maleic anhydride plate such as React i-Bind (trademark) Maleic Anhydride Activated Polystyrene 96- Well Plates (PI ERCE For example, Immobilizer TM -Amino Modules / Plates (Nunc) as an active amino plate, or as an ISA plate MS-8796 F (96 uel ⁇ C type ⁇ flat bottom ⁇ carbo) Sumitomo Beichikrite).
- a maleic anhydride plate such as React i-Bind (trademark) Maleic Anhydride Activated Polystyrene 96- Well Plates (PI ERCE
- Immobilizer TM -Amino Modules / Plates (Nunc) as an active amino plate, or as an ISA plate MS-8796 F (96 uel ⁇ C type ⁇ flat bottom ⁇ carbo) Sumitomo Beichikrite).
- microbeads having functional groups arranged on the surface include, for example, Sepharose (trademark) (GE Healthcare Bioscience 3 ⁇ 4) as a highly cross-linked agarose bead, and Dynabeads (trademark) (Dynal) as a magnetic bead.
- Sepharose trademark
- Dynabeads trademark
- the connection between the piotin-binding protein and the solid carrier may be performed according to the instructions attached to the carrier.
- microplates such as Reacti-Bind TM Streptavidin Coated Plates (PI ERCE), unc Streptavidin Coated 96 Micro Well TM Plates (Nalge Nunc), Alternatively, commercially available products such as magnetic beads such as Dynabeads M-280 Streptavidin (Dyna 1 3 ⁇ 4:, MagnaBind Tk Streptavidin Beads (PI ERCE)) may be used, but the present invention is not limited thereto.
- PI ERCE Reacti-Bind TM Streptavidin Coated Plates
- PI ERCE unc Streptavidin Coated 96 Micro Well TM Plates
- magnetic beads such as Dynabeads M-280 Streptavidin (Dyna 1 3 ⁇ 4:, MagnaBind Tk Streptavidin Beads (PI ERCE)
- PI ERCE MagnaBind Tk Streptavidin Beads
- piotin and piotin-binding protein are not used, for example, histidine tag, FL AG TM tag, or glutathione S-transferase (GST) is bound to the virus binder, and N It is also possible to indirectly bind the virus-binding substance and the carrier by binding i-NTA (nitrite triacetate), anti-FLAG antibody, or dalbutthione, and binding each.
- i-NTA nitrite triacetate
- anti-FLAG antibody anti-FLAG antibody
- dalbutthione dalbutthione
- the recovery rate of the virus to be quantified is not necessarily 100%, and varies slightly depending on the sample and conditions, so the recovery rate is not strictly constant. This is sufficient for the purpose of obtaining an approximate number of viruses.
- virus quantification that can withstand mid- to long-term fatigue assessment, it is necessary to measure the amount of body fluid collected over a period of time and compare the amount continuously. If it fluctuates, it becomes difficult to compare the amount of virus collected and quantified at the time of passage.
- the inventors have the same recovery rate as the fixed virus and can determine and measure the number of viruses even if they are mixed with the virus to be quantified.
- a virus hereinafter referred to as “reference virus”
- the initial sample for example, saliva
- the amount of the reference virus added to the initial sample is recovered.
- the recovery rate is evaluated based on the amount of the reference virus. Then, by multiplying the measured value of the target virus by this recovery rate and correcting the measured value of the amount of virus, it was possible to always quantitate the constant comfort model virus accurately.
- the recovery rate is evaluated, and the measured value of the constant comfort virus is corrected, it is preferable to do this in one measurement system.
- the recovery rate may be evaluated by adding the reference virus to only one of them, and the virus to be quantified may be measured with the other, and the measured value of the virus to be quantified may be corrected from the results of both.
- the standard virus when quantifying the virus of a large number of specimens, it is preferable to introduce the standard virus into all specimens for quantification, but it is always necessary if the virus recovery rate is stable. It is not necessary to introduce the reference virus for all specimens, and the introduction of the reference virus may be omitted as appropriate. In other words, by introducing a reference virus into some specimens, While confirming that the yield is stable, other samples may be subjected to virus quantification without introducing a reference virus, and such an embodiment is also included in the method of the present invention.
- the reference virus should have the same characteristics as the virus to be quantified and be easily distinguishable from the virus to be quantified. That is, in the quantification method of the present invention, it binds to a virus-binding substance in the same manner as the virus to be quantified, and is recovered in the same manner, and quantified so that it can be easily distinguished from the target virus by PCR, LAMP, ELISA, etc. It must be possible.
- the inventors prefer to use a variant HHV-6 when the target virus is HHV-6 and a variant HHV-7 when the target virus is HHV-7. I found out.
- Mutant HHV-6 is a recombinant virus derived from HHV-6, which is wild in the region corresponding to the U 2 to U 8 region of HHV-6 or the region corresponding to the U 2 4 and U 2 5 regions. Those having an exogenous nucleotide sequence not present in the type H HV-6 genome are preferred.
- the mutant HHV-7 is a recombinant virus derived from HHV-7, and a wild-type HHV— is present at a site corresponding to the U 2 to U 8 region or U 2 4 to 25 region of HHV-7. Those having an exogenous nucleotide sequence not present in the genome are preferred.
- the exogenous nucleotide sequence is a sequence that does not exist in the human genome of the wild-type HHV that is a consolation. If it is, there will be no restriction
- the length of the exogenous nucleotide sequence is not particularly limited, but is preferably 10 bases or more and 20 or 0 bases or less, more preferably 2 bases or more and 10 or 0 bases. It is as follows.
- HHV-6 sugar chain-lectin binding when a structural gene is inserted as an exogenous nucleotide sequence in such a system, it does not affect the recovery rate of HHV to be quantified (for example, it affects HHV-6 sugar chain-lectin binding).
- fluorescent proteins eg, green fluorescent protein: GFP and enhanced green fluorescent protein: EGFP
- antibiotic resistance proteins eg, tetracycline, ampicillin, kanamycin
- Preferred nucleotide sequences are:
- an exogenous protein not present in the wild-type HHV in the mutant HHV for example, in the immunoassay such as ELISA.
- a protein is encoded by an exogenous nucleotide sequence, and the nucleotide sequence is not particularly limited as long as it is a sequence that does not exist in the conservative wild-type HHV genome, but it does not exist in the human genome. Preferably it is a sequence.
- the exogenous protein a fluorescent protein, an antibiotic resistance protein, or the like as described above, which does not affect the recovery rate of HHV to be quantified, is preferable.
- an enzyme or the like that can be easily used can also be preferably used.
- a recombinant virus for example, see Patent No. 3923505 in which a gene encoding a protein for measurement separately from wild-type HHV-6 is used preferably it can.
- a recombinant virus for example, see JP 2007-159586 in which a gene encoding a protein for measurement separately from wild type HHV-7 is preferably used. it can.
- the amount of the reference virus added to the sample is not particularly limited as long as the amount of the reference virus can be quantified.
- the mutant HH V-6 from 1 to 1 copy per 1 m 1.
- Quantification using the reference virus is not only used as a reference for recovery and concentration of the target virus using a carrier, but also for subsequent quantification using PCR or LAMP, because the reference virus has the characteristics described above. It can be preferably used as it is as a standard for quantification using the internal standard or ELISA method.
- the method of the present invention includes the step of contacting a body fluid with a virus binding substance.
- the condition for contacting the body fluid with the virus-binding substance is not particularly limited as long as the virus and the virus-binding substance in the sample bind to each other to such an extent that the virus can be quantified. Elements of contact conditions include incubation temperature and incubation time.
- the body fluid may be contacted with the virus-binding substance as it is or after a desired buffer solution is added to the body fluid. When a desired buffer solution is added, the amount of the added buffer solution must be taken into account when calculating the virus amount.
- the lower limit of the incubation temperature may be 4 or 10; the upper limit is 50, 45, 4 O t :, 37, selected from the group consisting of 30, 25, and 20 As a preferable incubation temperature, 10 to 37 t :, 10: to 25, 10 to 20 or 15 can be mentioned.
- the lower limit of the incubation time may be selected from the group consisting of 1 minute, 3 minutes, 5 minutes, 10 minutes, 15 minutes, 20 minutes, 30 minutes
- the upper limit is overnight, 10 hours, 8 hours , 5 hours, 3 hours, 2 hours, 1.5 hours, and 1 hour.
- Preferable incubation times include 5 minutes to 2 hours, 10 minutes to 1.5 hours, and 30 minutes to 1 hour.
- the virus-binding substance is bound via a molecule capable of binding to the carrier before, simultaneously with, or after contacting the virus-binding substance and the body fluid.
- the substance and the carrier are bonded together.
- the conditions for bringing the virus-binding substance into contact with the carrier are not particularly limited as long as the virus-binding substance can sufficiently bind to the carrier via a molecule that can bind to the carrier. Elements of contact conditions include incubation temperature and incubation time.
- the conditions similar to the above-mentioned conditions for bringing the virus into contact with the virus-binding substance can be appropriately selected, but particularly preferred incubation times are 1 minute to 2 hours, 3 minutes to 1 hour, 5 minutes. Up to 30 minutes.
- the carrier that captures the constant-conformity virus via the virus-binding substance is separated from the sample body fluid by a method known to those skilled in the art according to the nature of the carrier.
- separation of the carrier from the sample may be accomplished by centrifugation followed by removal of the supernatant.
- the carrier may be separated from the sample by collecting the carrier using a magnet and removing the supernatant.
- the carrier may be separated from the sample by pulling up the carrier from the sample or passing the sample through the carrier.
- the carrier is a microplate However, if it is designed to capture viruses inside the well structure, the carrier may be separated from the sample by simply removing the sample from the well.
- a step of washing the separated carrier may be added in order to remove substances non-specifically bound to the carrier separated from the sample.
- the conditions of the washing solution and temperature used in the washing step are not particularly limited as long as the conditions for maintaining the binding between the virus and the virus-binding substance and / or the binding between the virus-binding substance and the carrier are maintained.
- the wash solution is buffered and may be a buffer solution with a pH of 7-8, eg, a buffer based on Tris EDTA (TE), PBS, HEPES, TBS, etc.
- the pH of the cleaning solution may be 6-9, preferably 7-8.
- the cleaning temperature is not particularly limited, but the lower limit of the cleaning temperature may be 4 or 10, and the upper limit may be selected from the group consisting of 50, 45, 40, 37, 30, 25, and 20. Good. Preferred washing temperatures include 10 to 37, 10 to 25, 1 Ot to 20, 151 :.
- the amount smaller than the initial volume of the body fluid is not particularly limited, but may be 1/2, 1/10, 1Z20, 1/40, 1/60, 1/80, 1/100 of the initial volume.
- the buffer solution added to the carrier that captures the virus to be quantified is selected appropriately according to the virus quantification method to be applied thereafter.
- the virus number is quantified.
- quantifying the number of viruses means quantifying the amount of virus present in a sample.
- quantifying the number of viruses includes, for example, directly or indirectly quantifying as an absolute virus number, as a virus concentration, or as a virus titer.
- Methods for measuring the number of viruses include a method for quantifying the amount of viral DNA and a method for quantifying the number of antigens derived from virus particles, and known quantification methods can be used as appropriate.
- the former includes real-time PCR Examples include methods based on PCR (Science, (1985), 230: 1350-1354), and quantification of DNA using the LAMP method (Nucleic Acids Res., (2000), 28: E63). Examples of the latter include antigen protein quantification methods such as sandwich ELISA. There is also a method of quantifying the virus titer by infecting a desired cell for infection with a virus. When measuring the amount of viral DNA, it is necessary to destroy the viral coat protein. Therefore, although not limited thereto, heat treatment, addition of a surfactant, proteinase K treatment, or a combination thereof can be preferably used in an appropriate buffer solution.
- the buffer is not particularly limited, but the reaction pH may be 5.0 to 9.0, preferably 6.0 to 8.0, and more preferably 7.0 to 8.0.
- the buffer solution having a pH of 7 to 8 may be a buffer solution based on, for example, Tris / EDTA (TE), PBS, HEPES, TBS, or the like.
- the temperature of the heat treatment is not particularly limited, but a preferable heat treatment temperature may be 60 to 100 ⁇ 0, more preferably 70 to 95 t: more preferably 80 to 95, and a treatment time of 5 Min to 1 hour, preferably 10 to 30 minutes.
- the type of the surfactant is not particularly limited as long as it does not affect the subsequent quantitative measurement of the virus.
- Non idet P-40, Tween 20, Triton X-100, and the like examples thereof include Non idet P-40, Tween 20, Triton X-100, and the like.
- concentration may be from 0.01% to 1%, preferably from 0.05% to 0.5%, more preferably from 0.05% to 0.25%.
- a chemical and a surfactant they can be combined as appropriate within the above range.
- the present invention also provides a kit for quantifying the number of human herpesviruses collected from body fluids based on the method of the present invention.
- the kit of the present invention comprises at least a pyotinylated virus binding substance and a carrier bound with a biotin binding protein.
- the kit of the present invention comprises at least a piotini virus binding substance, a carrier conjugated with a piotin-binding protein, and a reference virus having a predetermined concentration.
- the virus-binding substance, piotin-binding protein, carrier, and reference virus are as defined above.
- the kit of the present invention comprises at least a nanobin to which a virus-binding substance is bound.
- the kit of the present invention comprises at least nanobeads to which a virus-binding substance is bound and a reference virus having a predetermined concentration. Viral binding substances, nanobeads and reference viruses are as defined above.
- the kit of the present invention further comprises a buffer for binding the virus and the virus-binding substance, a buffer for washing the separated virus-binding carrier, and / or for subsequent addition to the carrier.
- the buffer solution may be contained.
- the kit of the present invention may further contain a reagent for quantifying the virus and Z or a buffer.
- a reagent for quantifying the virus examples include DNA polymerase, primers, appropriate probes as necessary, and appropriate buffers.
- the virus quantification method is based on the quantification of the number of antigens, an antibody that recognizes an antigen, an appropriate secondary antibody for detection, an appropriate buffer, and the like can be mentioned.
- each reagent may be enclosed in a suitable container. Further, the kit of the present invention may also include a package for appropriately packing the reagents contained therein.
- the kit of the present invention may contain appropriate instructional materials. Instructions for use include, but are not limited to, instructions on how to use the package, or printed materials, electronic storage media (eg, air discs, tapes, cartridges, tips), and optical media (eg, CDR OM), And the like, and a medium that can convey to the user how to use the kit of the present invention. In addition, the description of the address on the Internet site that provides the instructional material is also included in the instructional material.
- V-6 concentration of V-6 could be achieved by reacting the pectinated lectin with cultured HHV-6 solution and binding it to magnetic beads bound with mavidin.
- HHV-6 solution Preparation of HHV-6 solution from cultured sputum cells Human umbilical cord blood-derived cultured T cells were infected with recombinant HHV-6 expressing EGFP (Patent No. 39235 05) to prepare an EGFP type HHV-6 solution.
- the magnetic beads were washed with cold ultrapure water 300 ⁇ 1, followed by 5 OmM ME S buffer (pH 5.0) 300 1, and replaced with 50 mM MES buffer (pH 5.0) 0.6 mg / m 1 evening Mavidin was mixed with 300 1 (180 g). By shaking at room temperature for 30 minutes, the mavidin and magnetic beads were bound by covalent bond. The magnetic beads were collected with a magnet and the supernatant was removed. Next, after removing unreacted carboxyl groups in the beads with 5 OmM Tris buffer (pH 7.0) 300 1, magnetic beads in PBS buffer 300 u containing 0.5% BSA and 0.1% Tween 20 Blocked. Magnetic beads were suspended in PBS buffer 30 O 1 to complete the magnetic beads. The evening mavidin magnetic beads had a piotine binding activity of 15 nmo 1 per lm 1 of bead suspension.
- virus concentration was attempted using the infectious titer of recombinant HHV-6 as an index.
- Piotinylated lectins are manufactured by J—Oil Mills, Inc. 15 types (Con A, DBA, LCA, PHA-E4, PNA, RCA120, UEA-I, WGA, ABA, DSA, Lotus, MAM, PHA- L4, SBA, SSA) were used.
- EGFP recombinant HHV-6 solution 100 1 (concentration 10 4 m 1 TE) and PBS 500 1 were mixed and incubated at 15 for 1 hour (inverted mixing).
- evening mavidin magnetic beads prepared in item 2 above were added to the reaction solution, and further incubated at 15 for 1 hour (mixed by inversion).
- Eppendorf Fuchu containing the reaction solution The plate was placed on a dynabead magnetic stand and then washed twice with PBS 2 mM EDTA 0.5% BSA 200 1. This was then suspended in a culture medium (RPMI 1640 + 10% urine fetal serum) 500 1 and then suspended in 0.5 ml of Indike overnight cells (MT 4 cells).
- a culture medium RPMI 1640 + 10% urine fetal serum
- EGFP-type HHV-6 If EGFP-type HHV-6 is present, EGFP-type HHV-6 infects cells in the indica every day, and DNA of HHV-6 enters the cell, and the EGFP gene incorporated into the virus in it. Is expressed and emits GFP fluorescence. As a result of the above experiment, as shown in Fig. 1, it was confirmed that there was almost no non-specific adsorption of HHV-6 to evening mavidin beads.
- the concentration of HHV-6 in the saliva was quantified using a pyotinylated lectin and evening mavidin magnetic beads without using a reference virus.
- Saliva from the subject was collected using salivets (salivet cotton, manufactured by Zalus Yutt). The subject squeezed the oral cavity twice with distilled water just before collecting saliva, and then included saliva in the oral cavity for 2 minutes and collected saliva.
- the HHV-6 concentration in saliva was quantified using the method.
- the obtained DNA was subjected to quantitative PCR.
- quantitative PCR the HHV-6 U65 / 6 6 region was quantified by the real-time PCR method.
- the sequence used for PCR was
- TaqMan probe FAM 5 '-AGCAGCTGGCGAAAAGTGCTGTGC-3' TAMRA (SEQ ID NO: 3); FastStart Universal Probe Master (Rox) (Roche), reaction temperature 9 5 10 minutes, 95 seconds for 5 seconds + Real-time PCR was performed in 60 seconds for 31 seconds and 45 cycles.
- the amount of HHV-6 in the eluate 51 was 2934 copies. Therefore, it is calculated that 5868 copies of HHV-6 existed in TEl O x l. Since this is the amount of HHV-6 originally present in saliva 400 1, it is calculated to be 14 670 copies Zm 1 per ml. This value was in good agreement with the value measured by the conventional method in 2 above (14616 copies Zml). In this case, the virus recovery rate can be considered to be almost 100%.
- HHV-6 can be quantified using piotinylated SBA.
- the concentration of HHV-6 in saliva was quantified using a pyotinylated lectin, evening mavidin magnetic beads, and reference virus.
- Saliva from the subject was collected using salivets (salivet cotton, manufactured by Sarstatt). The subject squeezed the oral cavity twice with distilled water just before collecting saliva, and then included saliva in the oral cavity for 2 minutes and collected saliva.
- the amount of HHV-6 in saliva was determined in the same manner as in item 2 of Example 2.
- the EGFP type HHV-6 solution containing 1000 copies of EGFP type HHV-6 was added to the saliva 400 1 collected in item 1 above. Subsequently, PBS 10 times the concentration of 44 1 and piotinated WGA 1 nmo 1 were mixed and incubated at 15 for 30 minutes (mixed by inversion). Next, evening mavidin magnetic beads 101 prepared in Example 1 were added to the reaction solution, and further incubated for 30 minutes at 15 (mixed by inversion). Then reaction The Eppendorf tube containing the solution was placed on a magnetic stand for Dynabeads and then washed 3 times with PBS 500/1.
- TaqMan probe FAM 5'-CTGAGCACCCAGTCCGCCCTG-3 'TAMRA (SEQ ID NO: 6);
- TaqMan probe FAM 5′-AGGCACCCGTTCCGCCCCAGC-3 ′ TAMRA (SEQ ID NO: 9);
- the real-time PCR method was performed using FastStart Universal Probe Master (Rox) (Roche) at a reaction temperature of 95 for 10 minutes once and 95: 5 seconds +60 31 seconds for 45 cycles.
- Table 1 HHV—6 quantification and quantification using vivid chinification WG moth and tamavidin magnetic beads
- the concentration of HHV-7 in the saliva was quantified using a pyotinylated lectin and evening mavidin magnetic 14 beads without using a reference virus.
- Saliva from the subject was collected using salivets (salivet cotton, manufactured by Zalus Yutt). The subject squeezed the oral cavity twice with distilled water just before collecting saliva, and then included saliva in the oral cavity for 2 minutes and collected saliva.
- the HHV-7 concentration in saliva was quantified using a conventional method.
- the obtained DNA was subjected to quantitative PCR.
- quantitative PCR the HHV-7 U37 region was quantified by real-time PCR.
- sequence used for PCR was
- HHV-7 DNA in 1 ml of saliva was 22 1774 copies Zm 1.
- 250/1 saliva collected in item 1 above was mixed with PBS / piotinated WGA (J-Oil Mills 201) at a double concentration of 250/1 and incubated at 15 for 1 hour (mixed by inversion)
- PBS / piotinated WGA J-Oil Mills 201
- evening mavidin magnetic beads prepared in the same manner as in item 2 of Example 1 (however, use Dynabeads MyOne for magnetic beads) 50 1 was added to the reaction solution, and further incubated at 15 for 1 hour.
- the Ebendorf tube containing the reaction solution was placed on the magnetic stand for Dynabeads and then washed 3 times with PBS 500 1.
- the amount of HHV-7 in 1 ml of saliva was determined to be 223934 copies. This value was in good agreement with the value measured by the conventional method in 2 above (221774 copies Zml). In this case, the virus recovery rate can be considered to be 99%.
- HHV-7 can be quantified using piotinylated WG A.
- the present invention provides a novel quantification method and a kit for performing the method that enable more simple, accurate and efficient measurement of the number of HHV in a body fluid. Since the method of the present invention can withstand continuous evaluation of the number of HHV in body fluids, It is also applicable to quantitative evaluation of
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CN200980112159XA CN101983244A (zh) | 2008-03-31 | 2009-03-31 | 病毒定量方法 |
US12/935,429 US20110053145A1 (en) | 2008-03-31 | 2009-03-31 | Quantitation method of virus |
AU2009232597A AU2009232597A1 (en) | 2008-03-31 | 2009-03-31 | Quantitation method of virus |
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Also Published As
Publication number | Publication date |
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EP2267151A4 (en) | 2011-06-29 |
KR20100128293A (ko) | 2010-12-07 |
CA2722952A1 (en) | 2009-10-08 |
US20110053145A1 (en) | 2011-03-03 |
EP2267151A1 (en) | 2010-12-29 |
CN101983244A (zh) | 2011-03-02 |
AU2009232597A1 (en) | 2009-10-08 |
JPWO2009123347A1 (ja) | 2011-07-28 |
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