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US20050181363A1 - Method of effecting lysis of acid-fast bacteria and method of performing gene amplification or detection therewith - Google Patents

Method of effecting lysis of acid-fast bacteria and method of performing gene amplification or detection therewith Download PDF

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US20050181363A1
US20050181363A1 US10/500,435 US50043504A US2005181363A1 US 20050181363 A1 US20050181363 A1 US 20050181363A1 US 50043504 A US50043504 A US 50043504A US 2005181363 A1 US2005181363 A1 US 2005181363A1
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acid
heating
fast bacterium
gene
minutes
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Tatsuo Kamata
Yuji Izumizawa
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Arkray Inc
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Publication of US20050181363A1 publication Critical patent/US20050181363A1/en
Priority to US11/656,575 priority Critical patent/US7935483B2/en
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    • C—CHEMISTRY; METALLURGY
    • C12—BIOCHEMISTRY; BEER; SPIRITS; WINE; VINEGAR; MICROBIOLOGY; ENZYMOLOGY; MUTATION OR GENETIC ENGINEERING
    • C12N—MICROORGANISMS OR ENZYMES; COMPOSITIONS THEREOF; PROPAGATING, PRESERVING, OR MAINTAINING MICROORGANISMS; MUTATION OR GENETIC ENGINEERING; CULTURE MEDIA
    • C12N1/00—Microorganisms, e.g. protozoa; Compositions thereof; Processes of propagating, maintaining or preserving microorganisms or compositions thereof; Processes of preparing or isolating a composition containing a microorganism; Culture media therefor
    • C12N1/06—Lysis of microorganisms
    • C—CHEMISTRY; METALLURGY
    • C12—BIOCHEMISTRY; BEER; SPIRITS; WINE; VINEGAR; MICROBIOLOGY; ENZYMOLOGY; MUTATION OR GENETIC ENGINEERING
    • C12N—MICROORGANISMS OR ENZYMES; COMPOSITIONS THEREOF; PROPAGATING, PRESERVING, OR MAINTAINING MICROORGANISMS; MUTATION OR GENETIC ENGINEERING; CULTURE MEDIA
    • C12N15/00—Mutation or genetic engineering; DNA or RNA concerning genetic engineering, vectors, e.g. plasmids, or their isolation, preparation or purification; Use of hosts therefor
    • C12N15/09—Recombinant DNA-technology
    • C12N15/10—Processes for the isolation, preparation or purification of DNA or RNA
    • C12N15/1003—Extracting or separating nucleic acids from biological samples, e.g. pure separation or isolation methods; Conditions, buffers or apparatuses therefor
    • C—CHEMISTRY; METALLURGY
    • C12—BIOCHEMISTRY; BEER; SPIRITS; WINE; VINEGAR; MICROBIOLOGY; ENZYMOLOGY; MUTATION OR GENETIC ENGINEERING
    • C12Q—MEASURING OR TESTING PROCESSES INVOLVING ENZYMES, NUCLEIC ACIDS OR MICROORGANISMS; COMPOSITIONS OR TEST PAPERS THEREFOR; PROCESSES OF PREPARING SUCH COMPOSITIONS; CONDITION-RESPONSIVE CONTROL IN MICROBIOLOGICAL OR ENZYMOLOGICAL PROCESSES
    • C12Q1/00—Measuring or testing processes involving enzymes, nucleic acids or microorganisms; Compositions therefor; Processes of preparing such compositions
    • C12Q1/68—Measuring or testing processes involving enzymes, nucleic acids or microorganisms; Compositions therefor; Processes of preparing such compositions involving nucleic acids
    • C12Q1/6806—Preparing nucleic acids for analysis, e.g. for polymerase chain reaction [PCR] assay
    • C—CHEMISTRY; METALLURGY
    • C12—BIOCHEMISTRY; BEER; SPIRITS; WINE; VINEGAR; MICROBIOLOGY; ENZYMOLOGY; MUTATION OR GENETIC ENGINEERING
    • C12Q—MEASURING OR TESTING PROCESSES INVOLVING ENZYMES, NUCLEIC ACIDS OR MICROORGANISMS; COMPOSITIONS OR TEST PAPERS THEREFOR; PROCESSES OF PREPARING SUCH COMPOSITIONS; CONDITION-RESPONSIVE CONTROL IN MICROBIOLOGICAL OR ENZYMOLOGICAL PROCESSES
    • C12Q1/00—Measuring or testing processes involving enzymes, nucleic acids or microorganisms; Compositions therefor; Processes of preparing such compositions
    • C12Q1/68—Measuring or testing processes involving enzymes, nucleic acids or microorganisms; Compositions therefor; Processes of preparing such compositions involving nucleic acids
    • C12Q1/6844—Nucleic acid amplification reactions

Definitions

  • the present invention relates to a method of lysing acid-fast bacteria and to a method of performing gene amplification or gene detection using the same.
  • Tuberculosis still is a serious bacterial disease worldwide, and not only treatment methods but also diagnostic methods therefor are extremely important.
  • a final diagnosis as to the tuberculosis infection is made by carrying out a culture method.
  • tubercule bacilli have an extremely slow growth rate, the establishment of a preliminary diagnostic method to be performed prior to the culture method has been desired.
  • a method using a polymerase chain reaction (PCR) method is attracting attention.
  • a primer specific to a gene of a tubercule bacillus is used to amplify a gene of the tubercule bacillus, if any, so that it can be detected, thereby enabling the presence or absence of the tubercule bacillus to be determined.
  • a first lysis method of the present invention is a method of lysing an acid-fast bacterium to extract a gene from the acid-fast bacterium, including: heating the acid-fast bacterium in a liquid containing a non-ionic detergent at a temperature below a boiling point of the liquid.
  • a second lysis method of the present invention is a method of lysing an acid-fast bacterium to extract a gene from the acid-fast bacterium, including: causing lipolysis by treating the acid-fast bacterium with lipase, and heating the acid-fast bacterium in the presence of a non-ionic detergent.
  • a gene can be extracted sufficiently from an acid-fast bacterium by merely heating the acid-fast bacterium in a solution containing a non-ionic detergent, for example, at 96° C. for 10 minutes.
  • a method of amplifying or detecting the gene to be performed subsequently can be carried out easily.
  • the heating temperature is below the boiling point of the liquid, the method has the following advantages, for example. Since the bumping of the liquid is prevented, there is reduced concern that a sample might be scattered. Moreover, since the temperature can be controlled easily, a special heater is not necessary.
  • the inventors of the present invention achieved the second lysis method of the present invention by focusing on the fact that acid-fast bacteria have a high cell-wall lipid content. That is, in the second lysis method of the present invention, a cell wall of an acid-fast bacterium is weakened by the lipolysis and the acid-fast bacterium is lysed by the heating.
  • the first and second lysis methods of the present invention acid-fast bacteria can be lysed easily and in a short time without using any special reagent such as a chaotropic reagent or any special device such as an ultrasonic device. Besides, since the first and second lysis methods are chemical methods, they can be carried out safely with little risk that a sample might be scattered. Moreover, according to the first and the second lysis methods of the present invention, the gene extracted may be subjected to a gene amplification process or a gene detection process as it is without being purified. It is to be noted that the first and the second lysis methods of the present invention are applicable not only to a method of performing gene amplification or gene detection but also to other fields such as gene manipulation, for example.
  • FIG. 1 is a photograph showing the result of the electrophoresis performed to determine a lysing effect of one example of the present invention
  • FIG. 2 is a photograph showing the result of the electrophoresis performed to determine a lysing effect of another example of the present invention.
  • FIG. 3 is a photograph showing the result of the electrophoresis performed to determine a lysing effect of still another example of the present invention.
  • the heating temperature preferably is not less than 70° C. and less than 100° C., more preferably not less than 80° C. and less than 100° C., and most suitably 96° C. Furthermore, the heating is performed, for example, for 1 to 30 minutes, preferably for 10 minutes.
  • the pH of the liquid is, for example, in the range from 7.0 to 12.0, preferably 8.0.
  • the concentration of the non-ionic detergent in the liquid is, for example, 0.01 to 10 wt %, preferably 0.5 to 2.0 wt %, and more preferably 1.0 wt %.
  • non-ionic detergent examples include: D-sorbitol fatty acid esters such as Span 20, Span 40, Span 60, Span 65, Span 80, and Span 85 (all manufactured by Nacalai Tesque, Inc., for example); polyoxyethyleneglycol sorbitan alkyl esters such as Tween 20, Tween 21, Tween 40, Tween 60, Tween 65, Tween 80, Tween 81, and Tween 85 (all manufactured by Nacalai Tesque, Inc., for example); polyoxyethyleneglycol p-t-octylphenyl ethers such as Triton X-100 (manufactured by Nacalai Tesque, Inc., for example). These detergents may be used either alone or in combinations of two or more types. Among these, Triton X-100, Tween 20, and Tween 21 are preferable, and Triton X-100 is more preferable.
  • the liquid further contains a metal chelating agent.
  • the metal chelating agent serves to prevent a gene-degrading enzyme such as DNase contained in a sample from degrading the gene, for example.
  • the concentration of the metal chelating agent in the liquid is, for example, 0.1 to 100 mM, preferably 1.0 mM.
  • the metal chelating agent include ethylenediaminetetraacetic acid (EDTA), ethylene glycol bis( ⁇ -aminoethyl ether)—N, N, N′, N′-tetraacetic acid (EGTA), diaminocyclohexane tetraacetic acid, o-phenanthroline, and salicylic acid.
  • EDTA ethylenediaminetetraacetic acid
  • EGTA ethylene glycol bis( ⁇ -aminoethyl ether)—N, N, N′, N′-tetraacetic acid
  • Examples of an acid-fast bacterium to which the first lysis method of the present invention is applicable include M. avium, M. intracellularae, M. gordonae, M. tuberculosis, M. kansasii, M. fortuitum, M. chelonae, M. bovis, M. scrofulaceum, M. paratuberculosis, M. phlei, M. marinum, M. simiae, M. scrofulaceum, M. szulgai, M. leprae, M. xenopi, M. ulcerans, M. lepraemurium, M. flavescens, M. terrae, M. nonchromogenicum, M. malmoense, M. asiaticum, M. vaccae, M. gastri, M. triviale, M. haemophilum, M. africanum, M. thermoresistahle, and M. smegmatis.
  • examples of a biological sample containing an acid-fast bacterium include sputum, spinal fluid, feces, saliva, blood, tissues, and urine.
  • the first lysis method of the present invention can be carried out in the following manner, for example.
  • a metal chelating agent such as EDTA is added as necessary and a non-ionic detergent further is added, thus preparing a lysis reagent solution.
  • a buffer Tris-HCl buffer, HEPES buffer, MOPS buffer, HEPPS buffer, TAPS buffer, phosphate buffer, or the like may be used.
  • This lysis reagent solution preferably is sterilized by high-pressure steam in an autoclave.
  • a sample solution is prepared.
  • a sputum specimen that has been homogenized and sterilized by the N-acetyl-L-cysteine-NaOH method (NALC-NaOH method) or the like may be used as the sample solution.
  • the sample solution is centrifuged and the supernatant is removed.
  • the lysis reagent solution is added to the remaining precipitate (pellet).
  • a lysis treatment is carried out by heating the mixture at a temperature in the above-described predetermined range using a heating block or the like.
  • heating means other than the heating block include a water bath, a microwave oven, and an air bath.
  • the specimen thus lysed may be subjected to a gene amplification process or a gene detection process simply as it is or after being pretreated.
  • Examples of the method of performing the gene amplification or gene detection include a PCR method and modifications of the PCR method, such as a RT-PCR method.
  • examples of the gene to be analyzed include DNA and RNA.
  • the heating also serves to deactivate the lipase. This allows the lipase to be deactivated without performing any special process.
  • the possibility that the lipase might affect a process to be performed subsequent to the lysis treatment, such as a gene amplification process or a gene detection process, can be eliminated.
  • the lipolysis and the heating are performed in buffers, respectively. It is more preferable that the lipolysis and the heating are performed in the same buffer.
  • the type of the buffer is not particularly limited, and for example, Tris buffer, HEPES buffer, phosphate buffer, glycine buffer, McIlvaine buffer, and the like can be used. Among these, Tris buffer and HEPES buffer are preferable.
  • the lipolysis and the heating are performed in the same container as a closed system.
  • the lipolysis and the heating are performed in the same container as a closed system.
  • the heating may be performed after the lipolysis, or the lipolysis and the heating may be performed simultaneously.
  • the lipolysis is performed at a pH of 4 to 8 and at a temperature of 37° C. to 60° C. for 5 to 30 minutes, and the heating is performed at a temperature of 37° C. to 100° C. for 5 to 30 minutes.
  • the lipolysis is performed at a pH of 6 to 8 and at a temperature of 37° C. to 50° C. for 5 to 20 minutes, and the heating is performed at a temperature of 80° C. to 100° C. for 5 to 20 minutes.
  • the lipolysis is performed at a pH of 6.5 to 7.5 and at a temperature of 37° C. to 50° C. for 10 minutes, and the heating is performed at a temperature of 90° C. to 98° C. for 10 minutes.
  • the lipolysis and the heating are performed, for example, at a pH of 4 to 8 and at a temperature of 37° C. to 60° C. for 10 to 30 minutes; preferably at a pH of 6 to 8 and at a temperature of 37° C. to 50° C. for 10 to 20 minutes, and more preferably at a pH of 6.5 to 7.5 and at a temperature of 45° C. to 50° C. for 10 to 20 minutes.
  • the concentration of the lipase in the buffer is 10 to 10000 units/ml, preferably 100 to 2000 units/ml, and more preferably 200 to 1000 units/ml.
  • the lipase used is not particularly limited, and for example, products named Lipase R “AMANO” G, Lipase M “AMANO” 10, Lipase G “AMANO” 50, Lip ase AY “AMANO” 30G, Lip ase A “AMANO” 6 (all manufactured by Amano Pharmaceutical Co., Ltd.) and the like may be used. They may be used either alone or in combinations of two or more types. Among these, Lipase G “AMANO” 50 and Lipase AY “AMANO” 30G are preferable, and Lipase AY “AMANO” 30G is more preferable.
  • the concentration of the non-ionic detergent in the buffer is, for example, 0.01 to 10 wt %, preferably 0.1 to 2.0 wt %, and more preferably 0.5 to 1.0 wt %.
  • non-ionic detergent examples include: D-sorbitol fatty acid esters such as Span 20, Span 40, Span 60, Span 65, Span 80, and Span 85 (all manufactured by Nacalai Tesque, Inc., for example); polyoxyethyleneglycol sorbitan alkyl esters such as Tween 20, Tween 21, Tween 40, Tween 60, Tween 65, Tween 80, Tween 81, and Tween 85 (all manufactured by Nacalai Tesque, Inc., for example); polyoxyethyleneglycol p-t-octylphenyl ethers such as Triton X-100 (manufactured by Nacalai Tesque, Inc., for example). These detergents may be used either alone or in combinations of two or more types. Among these, Tween 20 and Triton X-100 are preferable, and Triton X-100 is more preferable.
  • the heating is performed in the presence of a metal chelating agent in addition to the non-ionic detergent.
  • the metal chelating agent serves to prevent a gene-degrading enzyme such as DNase contained in a sample from degrading the gene, for example.
  • concentration of the metal chelating agent in the liquid is, for example, 0.1 to 2.0 mM, preferably 0.5 to 1.0 mM.
  • the metal chelating agent include ethylenediaminetetraacetic acid (EDTA), glycol ether diaminetetraacetic acid (EGTA), and 1,2-cyclohexanediaminetetraacetic acid (CyDTA). These metal chelating agents may be used either alone or in combinations of two or more types. Among these, EDTA and EGTA are preferable, and EDTA is more preferable.
  • the second lysis method is applicable to the same acid-fast bacteria as the first lysis method. Furthermore, biological samples containing an acid-fast bacterium to be used in the second lysis method also are the same as those in the first lysis method.
  • the second method of the present invention can be carried out in the following manner, for example.
  • a buffer having a pH in the above-described predetermined range lipase and a non-ionic detergent are added, and a metal chelating agent such as EDTA is added as necessary, thus preparing a lysis reagent solution.
  • This lysis reagent solution preferably is sterilized by high-pressure steam in an autoclave.
  • a sample is added to this lysis reagent solution, and the resultant mixture is incubated at 45° C. for 10 minutes (the lipolysis), and then further incubated at 96° C. for 10 minutes (the heating).
  • a cell wall of the acid-fast bacterium is weakened by the former incubation, and the acid-fast bacterium is lysed and also the lipase is deactivated by the latter incubation.
  • Both of the incubations may be carried out using a heating block, a water bath, a thermal cycler, or the like.
  • the lipolysis and the heating may be performed simultaneously by adding the sample to the lysis reagent solution and then incubating the resultant mixture at a temperature of 37° C. to 50° C. for 10 to 20 minutes.
  • the sample may be prepared, for example, by homogenizing and sterilizing a sputum specimen by the N-acetyl-L-cysteine-NaOH method (NALC-NaOH method) or the like.
  • NALC-NaOH method N-acetyl-L-cysteine-NaOH method
  • the sample is centrifuged and the supernatant is removed. Thereafter, the lysis reagent solution is added to the remaining precipitate (pellet).
  • the specimen thus lysed may be subjected to a gene amplification process or a gene detection process simply as it is or after being pretreated.
  • Examples of the method of performing the gene amplification or gene detection include a PCR method and modifications of the PCR method, such as a RT-PCR method.
  • examples of the gene to be analyzed include DNA and RNA.
  • Examples 1-1, 1-2, 1-3, and 1-4 are directed to the first lysis method of the present invention, and Examples 2-1, 2-2, 2-3, and 2-4 are directed to the second lysis method of the present invention.
  • a clinical isolate of a tubercule bacillus was cultured in a product named MycoBroth (Kyokuto Pharmaceutical Industrial Co., Ltd.) at 37° C. until a turbidity corresponding to #1 of the McFarland turbidity standard was obtained. Then, the culture was diluted with phosphate buffer (pH 6.8) so as to achieve a series of 10-fold dilutions (10 2 -fold to 10 5 -fold), thus preparing test solutions containing the tubercule bacillus. Subsequently, 100 ⁇ l of the test solutions with the above-described concentrations were poured into screw capped tubes, respectively, and then centrifuged (10000 g, 15 minutes) to prepare pellets.
  • the pellets obtained from the respective test solutions were used as samples to be subjected to a lysis reaction.
  • a product named Triton X-100 (Nacalai Tesque, Inc.) was dissolved in TE buffer (10 mM EDTA and 25 mM Tris-HCl, pH 8.0) so that its concentration became 3 wt % to prepare a lysis reagent solution, and the lysis reagent solution was sterilized by high-pressure steam in an autoclave.
  • Example 1-1 To 37.5 ⁇ l of the thus-obtained lysed sample solutions of Example 1-1 and Comparative Example 1, 50 ⁇ l of a premixture of a product named AMPLICOR Amplification and Detection Kit (Nippon Roche K.K.) and 12.5 ⁇ l of 12 mM magnesium acetate were added. With regard to each of the mixtures obtained, amplification and detection by the PCR method were carried out in a COBAS AMPLICOR in accordance with the operating instructions of the kit.
  • AMPLICOR Amplification and Detection Kit Nippon Roche K.K.
  • Example 1-1 As a result of the above-described amplification and detection, it was found that, in both Example 1-1 and Comparative Example 1, the samples prepared from the test solutions with a dilution factor of up to 10 7 were judged as tuberculosis positive and those with a dilution factor of greater than 10 7 were judged as tuberculosis negative.
  • the lysis method according to Example 1-1 can achieve a sensitivity (lysis efficiency) equivalent to that of the conventional method (Comparative Example 1).
  • the lysis method according to Example 1-1 took only half the treatment period of the conventional method (Comparative Example 1).
  • a clinical isolate of a tubercule bacillus was cultured in a product named MycoBroth (Kyokuto Pharmaceutical Industrial Co., Ltd.) at 37° C. until a turbidity corresponding to #1 of the McFarland turbidity standard was obtained. Then, the culture was diluted with a non-tuberculous sputum that had been homogenized with a product named SUPTAZYME (Kyokuto Pharmaceutical Industrial Co., Ltd.) so as to achieve a series of 10-fold dilutions (10 0 -fold to 10 10 -fold). The resultant diluents were used as samples.
  • Triton X-100 (Nacalai Tesque, Inc.) was dissolved in TE buffer (10 mM EDTA and 25 mM Tris-HCl, pH 8.0) so that its concentration became 3 wt % to prepare a lysis reagent solution, and the lysis reagent solution was sterilized by high-pressure steam in an autoclave.
  • Example 1-2 To 37.5 ⁇ l of the thus-obtained lysed sample solutions of Example 1-2 and Comparative Example 2, 50 ⁇ l of a premixture of a product named AMPLICOR Amplification and Detection Kit (Nippon Roche K.K.) and 12.5 ⁇ l of 12 mM magnesium acetate were added. With regard to each of the mixtures obtained, amplification and detection by the PCR method were carried out in a COBAS AMPLICOR in accordance with the operating instructions of the kit.
  • AMPLICOR Amplification and Detection Kit Nippon Roche K.K.
  • Example 1-2 As a result of the above-described amplification and detection, it was found that, in both Example 1-2 and Comparative Example 2, the samples with a dilution factor of up to 10 4 were judged as tuberculosis positive and those with a dilution factor of greater than 10 4 were judged as tuberculosis negative.
  • the lysis method according to Example 1-2 can achieve a sensitivity (lysis efficiency) equivalent to that of the conventional method (Comparative Example 2) even under the influence of contaminants.
  • the lysis method according to Example 1-2 took only half the treatment period of the conventional method (Comparative Example 2).
  • a product named Triton X-100 (Nacalai Tesque, Inc.) was dissolved in TE buffer (10 mM EDTA and 25 mM Tris-HCl, pH 8.0) so that its concentration became 1 wt % to prepare a lysis reagent solution, and the lysis reagent solution was used after being sterilized by high-pressure steam in an autoclave. Specifically, 50 ⁇ l of the sterilized lysis reagent solution was added to the pellets obtained from the respective specimens to suspend the pellets. Then, a lysis treatment was carried out by heating the suspensions at 96° C. for 10 minutes in a heating block.
  • Comparative Example 3 samples (pellets) prepared in the same manner as in the above were lysed using a product named AMPLICOR Specimen Pretreatment Kit (Nippon Roche K.K.).
  • Example 3 To 12.5 ⁇ l of the thus-obtained lysed sample solutions of Example 1-3 and Comparative Example 3, 50 ⁇ l of a premixture of a product named AMPLICOR Amplification and Detection Kit (Nippon Roche K.K.) and 37.5 ⁇ l of 12 mM magnesium acetate were added. With regard to each of the mixtures obtained, amplification and detection by the PCR method were carried out in a COBAS AMPLICOR in accordance with the operating instructions of the kit. In addition, with regard to samples (pellets) prepared in the same manner as in the above, a culture test was carried out in the usual way.
  • AMPLICOR Amplification and Detection Kit Nippon Roche K.K.
  • the lysis method of the present invention can produce the lysing effect equivalent to that of the conventional method and can serve as a useful method in actual clinical tests.
  • the time required for the lysis treatment in the method of Example 1-3 was 30 minutes shorter than that in the method of Comparative Example 3.
  • a product named Lipase G “AMANO” 50 (Amano Pharmaceutical Co., Ltd.) and a product named Lipase AY “AMANO” 30G (Amano Pharmaceutical Co., Ltd.) were dissolved in 10 mM HEPES buffer (pH 7.0) to prepare lipase reagent solutions. Furthermore, a lysis reagent solution was prepared by adding a product named Triton X-100 (Nacalai Tesque, Inc.) to TE buffer (10 mM Tris and 1 mM EDTA, pH 8.0) and sterilizing the mixture by high-pressure steam in an autoclave (the thus-obtained lysis reagent solution is hereinafter referred to as “TE-Triton reagent”).
  • a culture of BCG used for preparing samples was prepared by culturing BCG in a liquid culture medium for growing acid-fast bacteria (a product named MycoBroth, manufactured by Kyokuto Pharmaceutical Industrial Co., Ltd.) until the solution containing the BCG had a turbidity corresponding to #1 of the McFarland turbidity standard and then diluting the solution as necessary.
  • a liquid culture medium for growing acid-fast bacteria a product named MycoBroth, manufactured by Kyokuto Pharmaceutical Industrial Co., Ltd.
  • the resultant solution containing the BCG was diluted gradually (10 ⁇ 4 , 10 ⁇ 3.5 , 10 ⁇ 3 , 10 ⁇ 2.5 , 10 ⁇ 2 ) with phosphate buffer (pH 6.8), thus preparing test solutions.
  • 100 ⁇ l of the test solutions with the above-described concentrations were poured into screw capped tubes, respectively, and then centrifuged (10,000 g, 15 minutes) to prepare pellets.
  • the pellets obtained from the respective test solutions were used as samples to be subjected to a lysis reaction.
  • the above-described lipase solutions were prepared so that the lipase concentrations became 100, 500, 1000, 2000, and 3000 (units/ml), respectively.
  • Example 1-4 the same procedures were carried out except that the lipase treatment was not performed.
  • PCR was carried out in the following manner: 94° C. for 1 minute to denature, followed by 30 thermal cycles, each cycle consisting of 94° C. for 30 seconds, 60° C. for 1 minute, and 72° C. for 1 minute.
  • the sequence of the primers and the composition of the reaction solutions are shown below.
  • the solution containing BCG obtained in the same manner as in the above was diluted gradually (10 ⁇ 4 , 10 ⁇ 3.5 , 10 ⁇ 3 , 10 ⁇ 2.5 ) with phosphate buffer (pH 6.8).
  • the resultant diluents were used as test solutions.
  • 100 ⁇ l of the test solutions with the above-described concentrations were poured into screw capped tubes, respectively, and then centrifuged (10,000 g, 15 minutes) to prepare pellets.
  • the pellets obtained from the respective test solutions were used as samples to be subjected to a lysis reaction.
  • Lipase AY “AMANO” 30G was added to the above-described TE-Triton solution so that its concentrations became 500 units/ml to prepare a lysis reagent solution.
  • 100 ⁇ l of the lysis reagent solution was added to the samples.
  • the resultant mixtures were mixed in a vortex mixer and then centrifuged slightly, followed by incubation at 45° C. The incubation was carried out for the following two different periods: 10 minutes and 30 minutes. Subsequently, a lysis treatment was carried out by heating the mixtures at 96° C. for 10 minutes (Example 2-2).
  • Example 2-3 the same procedures were carried out except that the lipase treatment and the heat treatment were performed simultaneously (45° C., 10 minutes).
  • Triton X-100 (Nacalai Tesque, Inc.) was added to TE buffer (10 mM Tris and 1 mM EDTA, pH 8.0) and to Tris buffer (10 mM Tris, pH 8.0) so that its concentration became 1%.
  • the resultant mixtures were sterilized in an autoclave, thus preparing a reagent containing EDTA and a reagent containing no EDTA.
  • these reagents are referred to as a TE-Triton reagent (containing EDTA) and a Tris-Triton reagent (containing no EDTA), respectively.
  • a culture of BCG used for preparing samples was prepared by culturing BCG in a liquid culture medium for growing acid-fast bacteria (a product named MycoBroth, manufactured by Kyokuto Pharmaceutical Industrial Co., Ltd.) until the solution containing the BCG had a turbidity corresponding to #1 of the McFarland turbidity standard and then diluting the solution as necessary.
  • a liquid culture medium for growing acid-fast bacteria a product named MycoBroth, manufactured by Kyokuto Pharmaceutical Industrial Co., Ltd.
  • the resultant solution containing BCG was diluted gradually (10 ⁇ 4.5 , 10 ⁇ 4 , 10 ⁇ 3.5 , 10 ⁇ 3 , 10 ⁇ 2.5 ) with phosphate buffer (pH 6.8), thus preparing test solutions.
  • 100 ⁇ l of the test solutions with the above-described concentrations were poured into screw capped tubes, respectively, and then centrifuged (10,000 g, 15 minutes) to prepare pellets.
  • the pellets obtained from the respective test solutions were used as samples to be subjected to a lysis reaction.
  • Lipase AY “AMANO” 30G was added to the above-described TE-Triton solution and to the Tris-Triton solution so that its concentrations became 500 units/ml.
  • the present invention provides a method of securely lysing acid-fast bacteria easily and in a short time without using any special device or special reagent. Therefore, by applying the method of the present invention to, for example, a pretreatment of a sample to be analyzed in an acid-fast bacterium test utilizing gene amplification and detection, the efficiency of the test can be improved easily.

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US20100055082A1 (en) * 2008-09-04 2010-03-04 Jacques Alain Bauer Immunomodulatory extracts from lactobacillus bacteria and methods of manufacturing and use thereof
US10435735B2 (en) 2014-03-07 2019-10-08 Dna Genotek Inc. Composition and method for stabilizing nucleic acids in biological samples
US11002646B2 (en) 2011-06-19 2021-05-11 DNA Genotek, Inc. Devices, solutions and methods for sample collection
US11572581B2 (en) 2002-06-07 2023-02-07 DNA Genotek, Inc. Compositions and methods for obtaining nucleic acids from sputum

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JP5568968B2 (ja) * 2009-11-30 2014-08-13 東洋紡株式会社 抗酸菌の溶菌方法
JP5714291B2 (ja) * 2010-10-15 2015-05-07 独立行政法人農業・食品産業技術総合研究機構 抗酸菌ｄｎａの抽出精製法
KR101370140B1 (ko) * 2012-06-08 2014-03-04 포항공과대학교 산학협력단 항산균 검출장치 및 그 검출방법

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US11572581B2 (en) 2002-06-07 2023-02-07 DNA Genotek, Inc. Compositions and methods for obtaining nucleic acids from sputum
US20100055082A1 (en) * 2008-09-04 2010-03-04 Jacques Alain Bauer Immunomodulatory extracts from lactobacillus bacteria and methods of manufacturing and use thereof
US11002646B2 (en) 2011-06-19 2021-05-11 DNA Genotek, Inc. Devices, solutions and methods for sample collection
US11536632B2 (en) 2011-06-19 2022-12-27 DNA Genotek, Inc. Biological collection system
US11549870B2 (en) 2011-06-19 2023-01-10 DNA Genotek, Inc. Cell preserving solution
US11592368B2 (en) 2011-06-19 2023-02-28 DNA Genotek, Inc. Method for collecting and preserving a biological sample
US10435735B2 (en) 2014-03-07 2019-10-08 Dna Genotek Inc. Composition and method for stabilizing nucleic acids in biological samples
US11198899B2 (en) 2014-03-07 2021-12-14 Dna Genotek Inc. Composition and method for stabilizing nucleic acids in biological samples

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KR20040101234A (ko) 2004-12-02
DE60329676D1 (de) 2009-11-26
JPWO2003097816A1 (ja) 2005-09-15
EP1506995A1 (en) 2005-02-16
CN1656211A (zh) 2005-08-17
WO2003097816A1 (fr) 2003-11-27
EP1506995B1 (en) 2009-10-14
JP3910198B2 (ja) 2007-04-25
CN1656211B (zh) 2010-04-28
ATE445697T1 (de) 2009-10-15
EP1506995A4 (en) 2005-06-22
KR100633808B1 (ko) 2006-10-13
US7935483B2 (en) 2011-05-03
AU2003242353A1 (en) 2003-12-02

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