JP2016067231A - Primer for detection of enterococcusfaecium bio strain - Google Patents
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Abstract
Description
本発明はEnterococcus faecium BIO株を検出するための、新規プライマー、および当該プライマーを用いるE.faecium BIO株の検出方法に関するものである。 The present invention relates to a novel primer for detecting Enterococcus faecium BIO strain, and E. coli using the primer . The present invention relates to a method for detecting faecium BIO strain.
E.faecium BIO株(目黒研究所)は、プロバイオティクス(宿主の腸管内の環境を改善することで健康に好影響を及ぼす生菌製剤や菌成分含有食品等を指す)として、健康食品や動物用飼料に使用されている。E.faecium BIO株は生菌のまま食品や飼料中に含有され、ヒトまたは動物内に摂取された後、腸管内の環境を改善することができるが、その体内動態についてはほとんど解明されていない。腸管内環境には多種多様なEnterococcus属が存在するため、E.faecium BIO株の体内動態を解明するには、他の常在しているEnterococcus属とE.faecium BIO株とを区別することが必須となる。そのため、常在する細菌およびEnterococcus属が多数存在する環境下でE.faecium BIO株を特異的にかつ定量的に検出する簡便な方法が望まれていた。また、E.faecium BIO株は胃酸等の影響により死滅して分解されることもあるため、E.faecium BIO株を腸管内環境に生きたまま効率的に送達できる製品を開発するためにも、特異的かつ定量的に検出する手法が求められていた。 E. faecium BIO strain (Meguro Laboratories) is a probiotic (for live food preparations and foods containing fungi components that have a positive effect on health by improving the environment in the intestinal tract of the host). Used in feed. E. The faecium BIO strain is contained in foods and feeds as live bacteria and can improve the environment in the intestinal tract after being ingested in humans or animals, but its pharmacokinetics is hardly elucidated. Due to the presence of a wide variety of Enterococcus genus in the intestinal environment, E. To elucidate the pharmacokinetics of the faecium BIO strain, other resident Enterococcus spp . It is essential to distinguish it from faecium BIO strains. Therefore, in an environment where a large number of resident bacteria and Enterococcus are present, E. coli is used . A simple method for specifically and quantitatively detecting the faecium BIO strain has been desired. In addition, E.E. For faecium BIO lines, sometimes decomposed killed due to the influence of gastric acid, E. In order to develop a product that can efficiently deliver the faecium BIO strain to the intestinal environment while being alive, a technique for specific and quantitative detection has been required.
本発明は、E.faecium BIO株を特異的に検出するためのプライマー、および当該プライマーを使用したE.faecium BIO株の検出方法を提供することを目的とする。 The present invention relates to E.I. primers specifically detecting the faecium BIO strain, and E. coli using the primers . It aims at providing the detection method of faecium BIO stock | strain.
本発明者らは、上記課題を解決すべく検討した結果、E.faecium BIO株に特有な挿入配列(配列番号11)を見出し、当該特有な配列に由来するプライマーがE.faecium BIO株を極めて特異的に検出できることを見出し、本発明を完成した。 The present inventors have made study to solve the above problems, E. An insertion sequence (SEQ ID NO: 11) unique to the faecium BIO strain was found, and a primer derived from the unique sequence was E. coli. The present invention was completed by finding that faecium BIO strain can be detected very specifically.
本発明は、下記:
(1) 配列番号1に示す塩基配列からなるオリゴヌクレオチドと、配列番号2に示す塩基配列からなるオリゴヌクレオチドとから構成される、プライマーセット;
(2) 配列番号3に示す塩基配列からなるオリゴヌクレオチドと、配列番号4に示す塩基配列からなるオリゴヌクレオチドとから構成される、プライマーセット;
(3) 配列番号5に示す塩基配列からなるオリゴヌクレオチドと、配列番号6に示す塩基配列からなるオリゴヌクレオチドとから構成される、プライマーセット;
(4) 配列番号7に示す塩基配列からなるオリゴヌクレオチドと、配列番号8に示す塩基配列からなるオリゴヌクレオチドとから構成される、プライマーセット;または
(5) 配列番号9に示す塩基配列からなるオリゴヌクレオチドと、配列番号10に示す塩基配列からなるオリゴヌクレオチドとから構成される、プライマーセット;
から選択される、Enterococcus faecium BIO株を検出するためのプライマーセットを提供する。
The present invention includes the following:
(1) A primer set comprising an oligonucleotide consisting of the base sequence shown in SEQ ID NO: 1 and an oligonucleotide consisting of the base sequence shown in SEQ ID NO: 2;
(2) A primer set comprising an oligonucleotide consisting of the base sequence shown in SEQ ID NO: 3 and an oligonucleotide consisting of the base sequence shown in SEQ ID NO: 4;
(3) A primer set composed of an oligonucleotide consisting of the base sequence shown in SEQ ID NO: 5 and an oligonucleotide consisting of the base sequence shown in SEQ ID NO: 6;
(4) Primer set comprising an oligonucleotide consisting of the base sequence shown in SEQ ID NO: 7 and an oligonucleotide consisting of the base sequence shown in SEQ ID NO: 8; or (5) Oligo consisting of the base sequence shown in SEQ ID NO: 9 A primer set consisting of a nucleotide and an oligonucleotide having the base sequence shown in SEQ ID NO: 10;
A primer set for detecting an Enterococcus faecium BIO strain selected from:
本発明は、試料より抽出したDNAを鋳型とし、上記に記載のプライマーセットを用いてPCRを行い、増幅産物の有無を指標として判定することを特徴とする、Enterococcus faecium BIO株の検出方法を提供する。 The present invention provides a method for detecting an Enterococcus faecium BIO strain, characterized in that DNA extracted from a sample is used as a template, PCR is performed using the primer set described above, and the presence or absence of an amplification product is determined as an index. To do.
本発明は、上記に記載のプライマーセットを含む、Enterococcus faecium BIO株検出用キットを提供する。 The present invention provides an Enterococcus faecium BIO strain detection kit comprising the primer set described above.
本発明にかかるプライマーセットは、E.faecium BIO株を特異的に検出することができるため、近縁種が多数存在する腸内環境のような環境下においても、E.faecium BIO株を簡易に検出することができる。 Primer set according to the present invention, E. it is possible to specifically detect faecium BIO lines, even in an environment such as the intestinal environment related species there are many, E. Faecium BIO strain can be easily detected.
本発明のE.faecium BIO株検出用プライマーセットは、E.faecium BIO株のドラフトゲノム配列とGenBankに登録されているE. faeciumのcompleteゲノム配列を比較することにより見出されたE.faecium BIO株に特有な挿入配列(配列番号11)をもとに設計した。
E.faecium BIO株に特有な配列(配列番号11)をもとに設計されたプライマーセットには、下記(1)〜(5)のプライマーセットが挙げられる:
(1)BIO−1F(配列番号1)とBIO−1R(配列番号2);
(2)BIO−2F(配列番号3)とBIO−2R(配列番号4);
(3)BIO−3F(配列番号5)とBIO−3R(配列番号6);
(4)BIO−4F(配列番号7)とBIO−4R(配列番号8);
(5)BIO−5F(配列番号9)とBIO−5R(配列番号10)。
E. Examples of the primer set designed based on a sequence unique to faecium BIO strain (SEQ ID NO: 11) include the following primer sets (1) to (5):
(1) BIO-1F (SEQ ID NO: 1) and BIO-1R (SEQ ID NO: 2);
(2) BIO-2F (SEQ ID NO: 3) and BIO-2R (SEQ ID NO: 4);
(3) BIO-3F (SEQ ID NO: 5) and BIO-3R (SEQ ID NO: 6);
(4) BIO-4F (SEQ ID NO: 7) and BIO-4R (SEQ ID NO: 8);
(5) BIO-5F (SEQ ID NO: 9) and BIO-5R (SEQ ID NO: 10).
上記のようにして得られたプライマーセットを用いてPCR増幅を行うと、試料にE.faecium BIO株が含まれる場合は、E.faecium BIO株に特異的な増幅産物が得られる。これにより、E.faecium BIO株を他の微生物と区別して特異的に検出することができる。 When PCR amplification was performed using the primer set obtained as described above, E. coli was added to the sample . if it contains faecium BIO strain, E. An amplification product specific to the faecium BIO strain is obtained. As a result, E.I. The faecium BIO strain can be specifically detected by distinguishing it from other microorganisms.
上記のプライマーセットはキットとすることもできる。本発明のキットは、上記プライマーセットを含むものであればよい。必要に応じて、DNA抽出用試薬、PCR用緩衝液やDNAポリメラーゼ等のPCR用試薬、リアルタイムPCR試薬、電気泳動用ゲル等の検出用試薬、PCRの陽性コントロールとなる標的配列を含むDNA分子、説明書などを含んでいてもよい。 The above primer set may be a kit. The kit of this invention should just contain the said primer set. If necessary, DNA extraction reagents, PCR reagents such as PCR buffers and DNA polymerases, real-time PCR reagents, detection reagents such as electrophoresis gels, DNA molecules containing target sequences that serve as PCR positive controls, Instructions etc. may be included.
本発明は、上記のプライマーセットを用いたE.faecium BIO株の検出方法を提供する。本方法は、試料より抽出したDNAを鋳型とし、上記のプライマーセットを用いてPCRを行い、該PCRによる増幅産物の有無を指標として検出することを特徴とする。 The present invention relates to an E. coli using the above primer set . A method for detecting a faecium BIO strain is provided. This method is characterized in that a DNA extracted from a sample is used as a template, PCR is performed using the above primer set, and the presence or absence of an amplification product by the PCR is detected as an index.
試料は、E.faecium BIO株が含有され得るものであれば、限定されない。例えば、糞便中のE.faecium BIO株を検出することで、経口摂取したE.faecium BIO株が腸管に到達したことを確認することができる。
また定量PCR法、例えばリアルタイムPCR法により、試料中に含まれるE.faecium BIO株の細胞数を定量することができるため、試料中のE.faecium BIO株を定量的に把握することができる。
Samples were E. There is no limitation as long as the faecium BIO strain can be contained. For example, E. coli in feces . By detecting the faecium BIO strain, E. coli taken orally . It can be confirmed that the faecium BIO strain has reached the intestinal tract.
In addition, E. coli contained in the sample is obtained by quantitative PCR, for example, real-time PCR . Since the number of cells of the faecium BIO strain can be quantified, E. coli in the sample can be quantified . The faecium BIO strain can be grasped quantitatively.
試料からのDNAの抽出は、核酸抽出法として当業者に知られる方法を用いて行うことができる。例えば、フェノール/クロロホルム法、ガラスビーズによる物理的破砕、界面活性剤による細胞溶解、プロテアーゼ酵素による細胞溶解などにより行うことができる。市販の各種DNA抽出キットを用いてもよい。 Extraction of DNA from a sample can be performed using a method known to those skilled in the art as a nucleic acid extraction method. For example, it can be performed by a phenol / chloroform method, physical disruption with glass beads, cell lysis with a surfactant, cell lysis with a protease enzyme, or the like. Various commercially available DNA extraction kits may be used.
試料から得られたDNAを鋳型として、上述のプライマーセットを用いてPCRを行い、増幅産物の有無を検出する。PCR条件(温度サイクル、サイクルの回数等)やPCR反応液の組成は、プライマーの長さやその塩基組成などに応じて適宜設定することができる。一連のPCR操作は、市販のPCRキットやPCR装置を利用して、その説明書に従って行ってもよい。 Using the DNA obtained from the sample as a template, PCR is performed using the above primer set to detect the presence or absence of an amplification product. The PCR conditions (temperature cycle, number of cycles, etc.) and the composition of the PCR reaction solution can be appropriately set according to the length of the primer and its base composition. A series of PCR operations may be performed according to the instructions using a commercially available PCR kit or PCR apparatus.
PCRで標的の増幅産物が得られたかどうかは、アガロースゲル電気泳動、DNAハイブリダイゼーション、増幅産物に特異的な標識プローブを用いる等の公知の方法を用いて確認することができる。標的の増幅産物のサイズは、挿入配列(配列番号11)の内、両プライマーの塩基数と当該両プライマーに挟まれる範囲の塩基数を合わせた数となる。 Whether or not a target amplification product is obtained by PCR can be confirmed using a known method such as agarose gel electrophoresis, DNA hybridization, or using a labeled probe specific to the amplification product. The size of the target amplification product is a number obtained by adding the number of bases of both primers and the number of bases in a range between the primers in the insertion sequence (SEQ ID NO: 11).
下表に本発明のプライマーセット(1)〜(5)、およびその増幅産物のサイズを示す。
以下、本発明を実施例によりさらに詳しく説明するが、本発明はこれらの例に限定されない。 EXAMPLES Hereinafter, although an Example demonstrates this invention in more detail, this invention is not limited to these examples.
実施例1
プライマーの設計
(1)E.faecium BIO株ドラフトゲノム配列の比較解析
88のコンティグ配列からなるE.faecium BIO株のドラフトゲノム配列を作成し、GenBankに登録されている4株のE.faeciumのcompleteゲノム配列とBIO株のドラフトゲノム配列を比較した。
使用したE.faeciumのcompleteゲノム配列情報は以下の通りである。
Enterococcus faecium Aus0085(PRJNA214432);
Enterococcus faecium DO(PRJNA55353);
Enterococcus faecium Aus0004(PRJNA87025);
Enterococcus faecium NRRL B−2354(PRJNA188477);
[()内はBioProjectのID]。
これらのcompleteゲノム配列をレファレンス配列として、GenomeMatcher(http://www.ige.tohoku.ac.jp/joho/gmProject/gmhomeJP.html)のContigAlignerを用いて、E.faecium BIO株のドラフトゲノム配列と比較した。
その結果、E.faecium Aus0004における遺伝子番号EFAU004_00233とEFAU004_00234の遺伝子間領域に関し、4つのレファレンス配列ではその対応する領域は約180bp程度であるのに対し、E.faecium BIO株の染色体上では、5495bpの挿入配列の存在が見出された。
この挿入配列について、Blast(Basic Local Alignment Search Tool)検索を用いて、GenBankに登録されている既知配列と比較し、最も相同性の低かった約800bp(配列番号11)を抽出し、E.faecium BIO株特異的なプライマーの設計に利用した。
この配列より下記の5つのプライマーセット
(1)BIO−1FR:BIO−1F(配列番号1)/BIO−1R(配列番号2);
(2)BIO−2FR:BIO−2F(配列番号3)/BIO−2R(配列番号4);
(3)BIO−3FR:BIO−3F(配列番号5)/BIO−3R(配列番号6);
(4)BIO−4FR:BIO−4F(配列番号7)/BIO−4R(配列番号8);
(5)BIO−5FR:BIO−5F(配列番号9)/BIO−5R(配列番号10);
を設計した。
Example 1
The design of primers (1) E. Comparative analysis of faecium BIO strain draft genome sequence E. coli consisting of 88 contig sequences . A draft genome sequence of faecium BIO strain was prepared, and four strains of E. coli registered in GenBank were registered . The complete genome sequence of faecium and the draft genome sequence of the BIO strain were compared.
The E. used . The complete genome sequence information of faecium is as follows.
Enterococcus faecium Aus0085 (PRJNA214432);
Enterococcus faecium DO (PRJNA55353);
Enterococcus faecium Aus0004 (PRJNA87025);
Enterococcus faecium NRRL B-2354 (PRJNA188477);
[Inside () is BioProject ID].
These complete genome sequence as a reference sequence, using the ContigAligner of GenomeMatcher (http://www.ige.tohoku.ac.jp/joho/gmProject/gmhomeJP.html), E. Comparison was made with the draft genome sequence of the faecium BIO strain.
As a result, E.I. Regarding the intergenic region of gene numbers EFAU004_00233 and EFAU004_00234 in faecium Aus0004, in the four reference sequences, the corresponding region is about 180 bp . The presence of an insertion sequence of 5495 bp was found on the chromosome of faecium BIO strain.
About this inserted sequence, about 800 bp (SEQ ID NO: 11) having the lowest homology was extracted using Blast (Basic Local Alignment Search Tool) search and compared with a known sequence registered in GenBank . This was used to design primers specific to faecium BIO strain.
From this sequence, the following five primer sets (1) BIO-1FR: BIO-1F (SEQ ID NO: 1) / BIO-1R (SEQ ID NO: 2);
(2) BIO-2FR: BIO-2F (SEQ ID NO: 3) / BIO-2R (SEQ ID NO: 4);
(3) BIO-3FR: BIO-3F (SEQ ID NO: 5) / BIO-3R (SEQ ID NO: 6);
(4) BIO-4FR: BIO-4F (SEQ ID NO: 7) / BIO-4R (SEQ ID NO: 8);
(5) BIO-5FR: BIO-5F (SEQ ID NO: 9) / BIO-5R (SEQ ID NO: 10);
Designed.
実施例2
<プライマーの特異性の評価>
DNA抽出
E.faecium BIO株を1mLのBHI(Brain Heart Infusion)培地にて37℃一晩静置培養した。抽出液<(TE10mM Tris−HCl、1mMエチレンジアミン四酢酸[pH8.0])飽和フェノール500μL;溶菌Buffer(1M Tris−HCl、0.5Mエチレンジアミン四酢酸[pH8.0])250μL;10% SDS 50μL;および、ガラスビーズ(φ0.1mm)0.3g>に上記の培養液200μLを添加し、FastPrep24(MP)を用いて、パワーレベル5.0で30秒間縦方向に激しく振とうし、菌体を破砕した。遠心分離により上清を回収しフェノール・クロロホルム・イソアミルアルコールを用いてタンパク質を変性した後、イソプロパノール沈殿によりDNAを析出させ、100μLのTE(10mM Tris−HCl、1mMエチレンジアミン四酢酸[pH8.0])に溶解して、E.faecium BIO株の鋳型DNAとして使用した。
加えて、ヒト糞便(一般的にE.faecium属細菌が多数存在する)よりDNAを抽出し、鋳型DNAとして使用した。抽出方法は健常人糞便0.1gを1mLの生理食塩水(0.8% NaCl)に懸濁したものをサンプル液として、上記のE.faecium BIO株DNAの抽出方法のうち培養液を該サンプル液と置き換えて、同様にDNA抽出を行った。
Example 2
<Evaluation of primer specificity>
DNA extraction
E. The faecium BIO strain was statically cultured overnight at 37 ° C. in 1 mL of BHI (Brain Heart Infusion) medium. Extract <(TE10 mM Tris-HCl, 1 mM ethylenediaminetetraacetic acid [pH 8.0]) saturated phenol 500 μL; Lysis Buffer (1 M Tris-HCl, 0.5 M ethylenediaminetetraacetic acid [pH 8.0]) 250 μL; 10% SDS 50 μL; Then, 200 μL of the above culture solution is added to 0.3 g> of glass beads (φ0.1 mm), and vigorously shaken in the vertical direction for 30 seconds at a power level of 5.0 using FastPrep24 (MP). It was crushed. The supernatant was collected by centrifugation, the protein was denatured using phenol, chloroform, and isoamyl alcohol, and then DNA was precipitated by isopropanol precipitation. 100 μL of TE (10 mM Tris-HCl, 1 mM ethylenediaminetetraacetic acid [pH 8.0]) E. Used as template DNA for faecium BIO strain.
In addition, DNA was extracted from human feces (generally a large number of bacteria belonging to the genus E. faecium ) and used as template DNA. The extraction method was performed by using the above-mentioned E.I. In the method of extracting faecium BIO strain DNA, the culture solution was replaced with the sample solution, and DNA was extracted in the same manner.
PCR増幅
上記で抽出したDNAについて、市販のPCR用試薬(タカラバイオ(株)製)とMy cycler(Bio−Rad製)を用いて、PCRを行った。
10×Ex Taqバッファ2.0μL、dNTP溶液(原液2.5mM)1.6μL、25mM MgCl2 0.8μL、抽出したE.faecium BIO株DNA10ngおよび糞便DNA50ng、ならびにDNAポリメラーゼ(TaKaRa Ex Taq)0.1Uを混合し、プライマーセットを0.5mMの濃度となるように添加し、滅菌蒸留水を用いて総反応液量20μLにして反応液を調製した。
E.faecium BIO株DNAを添加せず糞便DNAを60ng添加した反応液を陰性コントロールとして使用した。
E.faecium BIO株以外のE.faecium由来DNAも増幅するプライマーとして、E.faeciumの種特異的なプライマー:EM1AおよびEM1B(Cheng S1, McCleskey FK, Gress MJ, Petroziello JM, Liu R, Namdari H, Beninga K, Salmen A, DelVecchio VG., Journal of Clinical Microbiology1997 May;35(5):1248-50)を使用した。
全てのプライマーセットについて同条件でPCR反応を行った。
PCR反応条件を、表3に示す。
10 × Ex Taq buffer 2.0 μL, dNTP solution (stock solution 2.5 mM) 1.6 μL, 25 mM MgCl 2 0.8 μL, extracted E. coli . 10 ng of faecium BIO strain DNA, 50 ng of fecal DNA, and 0.1 U of DNA polymerase (TaKaRa Ex Taq) are added, the primer set is added to a concentration of 0.5 mM, and the total reaction volume is made 20 μL using sterilized distilled water. To prepare a reaction solution.
E. A reaction solution in which 60 ng of fecal DNA was added without adding faecium BIO strain DNA was used as a negative control.
E. E. coli other than faecium BIO strain As primers faecium derived DNA is also amplified, E. faecium species-specific primers: EM1A and EM1B (Cheng S1, McCleskey FK, Gress MJ, Petroziello JM, Liu R, Namdari H, Beninga K, Salmen A, DelVecchio VG., Journal of Clinical Microbiology 1997 May; 35 (5) : 1248-50) was used.
PCR reaction was carried out under the same conditions for all primer sets.
PCR reaction conditions are shown in Table 3.
PCR増幅産物を1.5%アガロースゲル電気泳動によって分離し、検出を行った。
PCR増幅産物のアガロースゲル電気泳動図を図1に示す。
E.faecium BIO株DNA+ヒト糞便DNAでは、本願発明にかかる5つのプライマーセットおよびE.faeciumの種特異的なプライマーセットで、増幅が確認された。
ヒト糞便DNA単独では、E.faeciumの種特異的なプライマーセットでのみ増幅が確認され、本願発明にかかる5つのプライマーセットでは増幅が確認されなかった。
PCR amplification products were separated by 1.5% agarose gel electrophoresis and detected.
An agarose gel electropherogram of the PCR amplification product is shown in FIG.
E. For faecium BIO strain DNA + human fecal DNA, five primer sets according to the present invention and E. coli. Amplification was confirmed with a faecium species-specific primer set.
In human fecal DNA alone, E. Amplification was confirmed only with the species-specific primer set of faecium , and amplification was not confirmed with the five primer sets according to the present invention.
実施例3
<ヒト糞便中からのE.faecium BIO株の定量>
被験者(4名)に、一粒あたりE.faecium BIO株を6.5×109cfu含むタブレットを、1個/1日、7日間摂取させた。摂取7日目の被験者の糞便中に含まれるE.faecium BIO株の菌数を、リアルタイムPCRにより定量した。PCR用試薬として、市販のリアルタイムPCR用試薬(SYBR Green、TOYOBO製)を使用した。
プライマーセットBIO−1FRで増幅したPCR産物を精製カラム(Wizard(登録商標)SV Gel and PCR Clean−Up System、プロメガ製)で精製し、濃度からコピー数を計算したものを、菌数の定量のスタンダードサンプルとして使用した。
BIO−1FRプライマーセットを使用して、上記実施例2の方法と同様にPCRを行った。
結果を表4に示す。
4名の被験者全員について、E.faecium BIO株含有タブレット摂取前には糞便からE.faecium BIO株は検出されなかったのに対し、摂取後(摂取期間7日)にはE.faecium BIO株が検出された。
また、当該摂取期間(7日間)終了の翌日から3日後には、糞便からE.faecium BIO株は検出されなくなった。
< E. From human feces Quantification of faecium BIO strain>
Subject (4 people) received E.E. A tablet containing 6.5 × 10 9 cfu of faecium BIO strain was ingested 1 tablet / day for 7 days. E. contained in feces of subject on
The PCR product amplified with the primer set BIO-1FR was purified with a purification column (Wizard (registered trademark) SV Gel and PCR Clean-Up System, manufactured by Promega), and the copy number calculated from the concentration was used to determine the number of bacteria. Used as a standard sample.
PCR was performed in the same manner as in Example 2 above using the BIO-1FR primer set.
The results are shown in Table 4.
For all subjects of 4 people, E. faecium BIO stock containing tablet intake before the E. from feces Although no faecium BIO strain was detected, E. coli was observed after ingestion (
In addition, from 3 days after the end of the intake period (7 days), E. The faecium BIO strain was no longer detected.
上記の結果は、E.faecium BIO株の特異的プライマーがE.faecium BIO株の定量に利用できることを立証するものである。
腸内に存在する糞便等の量は数リットルといわれる。投与したE.faecium BIO株(6.5×109cfu/日、7日間)が腸内環境では数千倍に希釈されることを考慮すると、4名中2名の被験者の糞便から108cfuもの細胞数が検出されたことは、E.faecium BIO株が腸内で増殖したためと考えられる。少なくともこの2名については、E.faecium BIO株が生きたまま腸管内に到達したと判断した。
The above results are as follows . The specific primer of the faecium BIO strain is E. coli . This proves that it can be used for quantification of faecium BIO strain.
The amount of feces etc. present in the intestine is said to be several liters. E. administration Considering that the faecium BIO strain (6.5 × 10 9 cfu / day, 7 days) is diluted several thousand times in the intestinal environment, the number of cells as many as 10 8 cfu from the stool of 2 out of 4 subjects That E. is detected . This is probably because the faecium BIO strain grew in the intestine. At least for this two people is, E. It was determined that the faecium BIO strain reached the intestine alive.
Claims (3)
(2) 配列番号3に示す塩基配列からなるオリゴヌクレオチドと、配列番号4に示す塩基配列からなるオリゴヌクレオチドとから構成される、プライマーセット;
(3) 配列番号5に示す塩基配列からなるオリゴヌクレオチドと、配列番号6に示す塩基配列からなるオリゴヌクレオチドとから構成される、プライマーセット;
(4) 配列番号7に示す塩基配列からなるオリゴヌクレオチドと、配列番号8に示す塩基配列からなるオリゴヌクレオチドとから構成される、プライマーセット;または
(5) 配列番号9に示す塩基配列からなるオリゴヌクレオチドと、配列番号10に示す塩基配列からなるオリゴヌクレオチドとから構成される、プライマーセット;
から選択される、Enterococcus faecium BIO株を検出するためのプライマーセット。 (1) A primer set comprising an oligonucleotide consisting of the base sequence shown in SEQ ID NO: 1 and an oligonucleotide consisting of the base sequence shown in SEQ ID NO: 2;
(2) A primer set comprising an oligonucleotide consisting of the base sequence shown in SEQ ID NO: 3 and an oligonucleotide consisting of the base sequence shown in SEQ ID NO: 4;
(3) A primer set composed of an oligonucleotide consisting of the base sequence shown in SEQ ID NO: 5 and an oligonucleotide consisting of the base sequence shown in SEQ ID NO: 6;
(4) Primer set comprising an oligonucleotide consisting of the base sequence shown in SEQ ID NO: 7 and an oligonucleotide consisting of the base sequence shown in SEQ ID NO: 8; or (5) Oligo consisting of the base sequence shown in SEQ ID NO: 9 A primer set consisting of a nucleotide and an oligonucleotide having the base sequence shown in SEQ ID NO: 10;
A primer set for detecting Enterococcus faecium BIO strain selected from
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