WO2021177372A1 - コロナウイルス(SARS-CoV-2)の検出方法 - Google Patents
コロナウイルス(SARS-CoV-2)の検出方法 Download PDFInfo
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Definitions
- the present invention relates to a method for detecting a new type of coronavirus (SARS-CoV-2) discovered in 2019, and more specifically, an acute respiratory disease (COVID-) caused by the new type of coronavirus 2019 using a highly sensitive gene detection method. It relates to the diagnostic assistance method of 19).
- SARS-CoV-2 coronavirus
- COVID- acute respiratory disease
- Acute respiratory disease (COVID-19) caused by the 2019 new coronavirus was reported in December 2019 as an outbreak of pneumonia patients of unknown cause in Wuhan City, Hubei province, China.
- the cause was confirmed to be a new type of coronavirus on January 7, 2020, and the following week, infected persons were confirmed in several countries other than China.
- the number of infected people exceeded 10,000, but the spread of the infection did not stop, and the World Health Organization (WHO) raised an internationally concerned public health emergency (PHEIC) on January 31. Declared.
- WHO World Health Organization
- COVID-19 The main clinical symptoms of COVID-19 are fever, cough, and general malaise. When it becomes severe, it causes pneumonia and dysfunction of the lungs, heart, and kidneys, which may lead to death.
- the mortality rate is about 3%, which is lower than the SARS outbreak from 2002 to 2003, but the number of deaths is higher than that during the SARS outbreak because the number of infected people is much higher than that during the SARS outbreak.
- the new virus (SARS-CoV-2) that causes COVID-19 is a beta coronavirus similar to SARS coronavirus and MERS coronavirus.
- the gene consists of a plus strand of single-stranded RNA and has a length of about 30,000 bases (GENBANK Accession No. MN908947).
- Non-Patent Document 1 The entire nucleotide sequence of SARS-CoV-2 was determined and published about one month after the first report of the outbreak of pneumonia. Based on this base sequence, a method for detecting SARS-CoV-2 by RT-PCR has been developed (Non-Patent Document 1 and others).
- Non-Patent Document 2 a test kit developed by the Centers for Disease Control and Prevention (CDC) has some defects.
- CDC Centers for Disease Control and Prevention
- An object of the present invention is to detect SARS-CoV-2, which is a pathogenic virus, with high sensitivity for the diagnosis of COVID-19.
- the present inventors have prepared oligonucleotide primers that selectively hybridize with the base sequence specific to SARS-CoV-2, and SARS- by the LAMP method.
- SARS-CoV-2 can be detected with high sensitivity by amplifying the base sequence specific to CoV-2, and completed the present invention.
- the present invention has the following configuration.
- a primer set for amplifying and detecting SARS-CoV-2 virus by the LAMP method and the primer set is from at least one designed from the following regions (a) to (b).
- Primer set. (A) Region from 28976 bases to 29211 bases of SEQ ID NO: 1
- a primer set, wherein the primer set contains at least one selected from the following groups (a1) to (b1).
- B1 A primer set consisting of an F3 primer consisting of SEQ ID NO: 8, a B3 primer consisting of SEQ ID NO: 9, a FIP primer consisting of SEQ ID NO: 10, and a BIP primer consisting of SEQ ID NO: 11.
- a primer set for amplifying and detecting the SARS-CoV-2 virus by the LAMP method, and the primer set is at least one selected from the following groups (a2) to (b2). Primer set including.
- A2 In addition to the primer set of (a1) described in [1], an LF primer consisting of SEQ ID NO: 6 and an LB primer consisting of SEQ ID NO: 7.
- B2 In addition to the primer set of (b1) described in [1], an LF primer consisting of SEQ ID NO: 12 and an LB primer consisting of SEQ ID NO: 13.
- a method for detecting SARS-CoV-2 virus which comprises performing an amplification reaction by the LAMP method using the primer set according to any one of [1] to [3].
- the presence or absence of SARS-CoV-2 virus infection is determined by detecting the amplification of the target nucleic acid region of SARS-CoV-2 virus using the primer set according to any one of [1] to [3].
- a method for inspecting COVID-19 which comprises inspecting.
- a kit comprising the primer set according to any one of [1] to [3] in the method for diagnosing COVID-19.
- a primer set for amplifying and detecting the SARS-CoV-2 virus by the LAMP method and the primer set is from at least one designed from the following regions (c) to (d).
- Primer set. (C) Region from 26767 bases to 26977 bases of SEQ ID NO: 1
- a primer set wherein the primer set contains at least one selected from the following groups (c1) to (d1).
- (C1) A primer set consisting of an F3 primer consisting of SEQ ID NO: 14, a B3 primer consisting of SEQ ID NO: 15, a FIP primer consisting of SEQ ID NO: 16, and a BIP primer consisting of SEQ ID NO: 17.
- (D1) A primer set consisting of an F3 primer consisting of SEQ ID NO: 21, a B3 primer consisting of SEQ ID NO: 22, a B4 primer consisting of SEQ ID NO: 23, a FIP primer consisting of SEQ ID NO: 24, and a BIP primer consisting of SEQ ID NO: 25.
- a primer set for amplifying and detecting the SARS-CoV-2 virus by the LAMP method wherein the primer set is at least one selected from the following groups (c2) to (d2).
- Primer set including. (C2) F3 primer consisting of SEQ ID NO: 14, B3 primer consisting of SEQ ID NO: 15, FIP primer consisting of SEQ ID NO: 16, BIP primer consisting of SEQ ID NO: 17, LF primer consisting of SEQ ID NO: 18, and LB consisting of SEQ ID NO: 19.
- a kit for amplifying and detecting SARS-CoV-2 virus by the LAMP method which comprises the primer set according to any one of [7] to [9] and a fluorescently labeled probe.
- a COVID-19 testing method comprising detecting the presence or absence of SARS-CoV-2 virus infection.
- an oligonucleotide primer that selectively hybridizes with a SARS-CoV-2 specific base sequence is prepared, and the SARS-CoV-2 specific base sequence is amplified by the LAMP method. , SARS-CoV-2 can be detected with high sensitivity and quickly.
- Samples used in the present invention include specimens derived from humans or other animals suspected of being infected with the SARS-CoV-2 virus, such as sputum, bronchial alveolar lavage fluid, nasal discharge, nasal suction fluid, nasal cavity lavage fluid, and nasal swab. Pharyngeal swabs, mouthwashes, saliva, blood, serum, plasma, spinal fluid, urine, feces, tissues and the like.
- cells used in infection experiments and their culture solutions, or samples containing viruses isolated from living body-derived samples and cultured cells can also be used as samples. These samples may be pretreated such as separation, extraction, concentration and purification.
- Amplification of nucleic acid contained in a sample is a nucleic acid amplification method developed by Notomi et al. That does not require temperature control, which is indispensable in the PCR method: Loop-mediated isothermal amplification method called LAMP (Loop-mediated Isothermal Amplification) method (international release). No. 00/28082) will be achieved.
- LAMP Loop-mediated Isothermal Amplification
- the 3'end of itself is annealed to a nucleotide as a template to serve as a starting point for complementary strand synthesis, and a primer to be annealed to the loop formed at this time is combined to carry out an isothermal complementary strand synthesis reaction.
- This is a nucleic acid amplification method that has been made possible.
- the check mechanism by the complementary bond of the base sequence functions repeatedly, and as a result, it is highly sensitive and peculiar. It enables highly potent nucleic acid amplification reaction.
- the oligonucleotide primers used in the LAMP method are the bases of a total of 6 regions of the base sequence of the template nucleic acid, that is, the regions F3c, F2c and F1c from the 3'end side and the regions B3, B2 and B1 from the 5'end side. At least four types of primers that recognize the sequence are referred to as a forward inner primer, a backward inner primer, a forward outer primer, and a backward outer primer, respectively. Further, the complementary sequences of F1c, F2c and F3c are referred to as F1, F2 and F3, respectively, and the complementary strands of B1, B2 and B3 are referred to as B1c, B2c and B3c.
- An inner primer is a nucleic acid synthesis reaction product that recognizes a "certain nucleotide sequence region" on a target base sequence and has a base sequence at the 3'end that gives a starting point for synthesis, and at the same time, uses this primer as the starting point.
- a primer containing the "base sequence selected from F2" and the “base sequence selected from F1c” is selected from the forward inner primer (hereinafter referred to as FIP primer), and the "base sequence selected from B2" and “B1c”.
- a primer containing the "existing base sequence” is called a backward inner primer (hereinafter referred to as BIP primer).
- the outer primer is an oligonucleotide having a base sequence that recognizes "a specific nucleotide sequence region existing on the 3'terminal side of" a specific nucleotide sequence region "" on the target base sequence and gives a starting point for synthesis.
- the primer containing the "base sequence selected from F3” is referred to as a forward outer primer (hereinafter referred to as F3 primer), and the primer containing the "base sequence selected from B3” is referred to as a backward outer primer (hereinafter referred to as B3 primer).
- F in each primer is a primer display that complementarily binds to the sense strand of the target base sequence and provides a starting point for synthesis
- B is complementary to the antisense strand of the target base sequence.
- It is a primer display that provides a starting point for synthesis.
- the length of the oligonucleotide used as a primer is 10 bases or more, preferably 15 bases or more, and may be either chemically synthesized or natural, and each primer may be a single oligonucleotide or a plurality of oligonucleotides. It may be a mixture of oligonucleotides.
- a loop primer in addition to the inner primer and the outer primer, another primer, that is, a loop primer can be used.
- the loop primer is a primer having a base sequence complementary to the base sequence of the single-stranded portion of the loop structure on the 5'end side of the dumbbell structure.
- the starting point of nucleic acid synthesis is increased, the reaction time can be shortened, and the detection sensitivity can be increased (Pamphlet of Patent Document International Publication No. 02/024902).
- the base sequence of the loop primer is complementary to the base sequence of the single-stranded portion of the loop structure on the 5'end side of the above-mentioned dumbbell structure, it may be selected from the base sequence of the target gene or its complementary strand.
- the loop primer may be one type or two types, and is referred to as a forward loop primer (hereinafter referred to as LF) and a backward loop primer (hereinafter referred to as LB) in the present specification.
- LF forward loop primer
- LB backward loop primer
- an outer primer (B4 primer) may be added downstream of the B3 primer.
- SARS-CoV-2 is an RNA virus.
- the nucleic acid amplification reaction can be similarly promoted by adding reverse transcriptase to the reaction solution when the template is DNA (RT-LAMP method).
- a primer set was designed from the N gene region and the RNA-dependent RNA polymerase (RdRP) gene region.
- the N gene region region from 28976 bases to 29211 bases of SEQ ID NO: 1 of the base sequence of SARS-CoV-2 (SEQ ID NO: 1) and the RNA-dependent RNA polymerase (RdRP) gene region (sequence)
- RdRP RNA-dependent RNA polymerase
- the present invention is a primer set consisting of at least one designed from the region (region from 15394 bases to 15595 bases) of No. 1.
- the present invention is a primer set consisting of F3, B3, FIP, and BIP, and designed a primer set containing at least one selected from the following two sets a and b.
- the present invention is a primer set containing at least one of LF primer and LB primer, which is selected from the following two sets a and b.
- the present inventors have conducted a diligent study on the base sequence of SARS-CoV-2 (SEQ ID NO: A primer set was designed from the M gene region and the S gene region of 1). That is, in the present invention, the M gene region (region from 26767 bases to 26977 bases of SEQ ID NO: 1) and the S gene region (region from 24660 bases to 24916 bases of SEQ ID NO: 1) of the base sequence of SARS-CoV-2 (SEQ ID NO: 1) It is a primer set consisting of at least one designed from the region up to the base).
- the present invention is a primer set consisting of F3, B3 (or B3 and B4), FIP, and BIP, and is a primer set containing at least one selected from the following two sets of c and d.
- the present invention is a primer set containing at least one of LF primer and LB primer, which is selected from the following two sets of c and d.
- the present invention is a kit containing the above-mentioned primer set c or d and a fluorescently labeled probe.
- the probe of primer set c is a probe consisting of SEQ ID NO: 20
- the probe of primer set d is a probe consisting of SEQ ID NO: 28.
- the cytosine base at the 3'end is fluorescently labeled with BODIPY® FL dye.
- These probes are Q probes. That is, when the probe binds to the target nucleic acid, the guanine base of the target nucleic acid and the fluorescent dye come close to each other, and the quenching action of the guanine base reduces the fluorescence intensity of the fluorescent dye.
- the method for detecting the SARS-CoV-2 virus of the present invention is a method of performing an amplification reaction by the LAMP method using the primer set of the present invention.
- the enzyme used in nucleic acid synthesis is not particularly limited as long as it is a template-dependent nucleic acid synthase having chain substitution activity.
- examples of such an enzyme include Bst DNA polymerase (large fragment), Bca (exo-) DNA polymerase, Klenow fragment of Escherichia coli DNA polymerase I, and preferably Bst DNA polymerase (large fragment).
- the reverse transcriptase used in the RT-LAMP method is not particularly limited as long as it has an activity of synthesizing DNA using RNA as a template.
- examples of such an enzyme include AMV, Cloned AMV, MMLV reverse transcriptase, SuperscriptII, RiverTrace, Thermoscript and the like, and preferably AMV or Cloned AMV reverse transcriptase.
- an enzyme having both reverse transcriptase activity and DNA polymerase activity such as Bca DNA polymerase, is used, the RT-LAMP reaction can be carried out with one enzyme.
- the enzyme or reverse transcriptase used in nucleic acid synthesis may be purified from a virus, a bacterium, or the like, or may be produced by gene recombination technology. Further, these enzymes may be modified such as fragmentation and amino acid substitution.
- the COVID-19 testing method of the present invention tests for the presence or absence of SARS-CoV-2 virus infection by detecting amplification of the target nucleic acid region of the SARS-CoV-2 virus using the primer set of the present invention.
- the method can be applied to the detection of nucleic acid amplification products after the LAMP reaction. For example, a method using a labeled oligonucleotide that specifically recognizes the amplified base sequence or a fluorescent intercalator method (Japanese Patent Laid-Open No. 2001-242169), or the reaction solution after completion of the reaction is subjected to agarose gel electrophoresis as it is. Can be easily detected.
- the primer set of the present invention can be pre-packaged and made into a kit together with various reagents necessary for detecting nucleic acid amplification.
- various oligonucleotides required as primers and loop primers of the present invention four types of dNTPs used as substrates for nucleic acid synthesis, DNA polymerases for nucleic acid synthesis, reverse transcription enzymes, and suitable conditions for enzymatic reactions are provided.
- Buffers and salts, protective agents that stabilize enzymes and templates, and, if necessary, reagents necessary for detection of reaction products are provided as kits.
- Example 1 Confirmation of detection sensitivity of primer sets a and b The detection sensitivity was confirmed by the LAMP method.
- 1. Preparation of samples and reagents 1) Samples (transcribed RNA) The RNA template was prepared by incorporating the cDNA prepared by RT-PCR from the SARS-CoV-2 gene into a plasmid and transcribing and purifying RNA from the plasmid DNA.
- Script Max registered trademark
- Thermo T7 Transcription Kit manufactured by Toyobo Co., Ltd., code number: TSK-101
- RNeasy registered trademark
- Mini Kit manufactured by Qiagen, Inc., catalog number: No
- a sample solution from the purified RNA was prepared dilutions from 10 copies per 1 ⁇ L to 10 3 copies. Further, the yeast RNA solution was used as a 0-copy sample solution (Negative Control).
- Reagent composition and concentration used in the LAMP method 25 ⁇ L of the LAMP reaction reagent having the following composition was prepared in a reagent tube of 0.2 mL.
- the primer the primer set a or b shown in Table 1 was used.
- Reaction by nucleic acid amplification method 1 Reaction by LAMP method 1.
- Example 2 Detection sensitivity when genomic RNA is used as a template The detection sensitivity was examined using viral genomic RNA distributed by the Institute of Infectious Diseases. At the same time, PCR was also performed to compare the detection sensitivities. Preparation of samples and reagents 1) Samples (genome RNA) A diluted solution of SARS-CoV-2 genomic RNA distributed by the Institute of Infectious Diseases from 50 copies to 1.6 ⁇ 10 3 copies per ⁇ L was prepared as a sample solution. 2) Reagent composition and concentration used in the LAMP method Reaction reagents were prepared in the same manner as in Example 1. As the primer set, the primer set a in which the N gene was detected was used. 3) Reagent composition and concentration used for PCR Primers and amplification reagents for detecting the N gene were prepared according to the "Pathogen Detection Manual 2019-nCoV Ver. 2.7" of the Institute of Infectious Diseases.
- Reaction by nucleic acid amplification method 1) Reaction by LAMP method The amplification reaction was carried out at 63 ° C. for 60 minutes with the real-time turbidity measuring device LoopampEXIA (registered trademark) in the same manner as in Example 1. 2) Reaction by PCR The RT-PCR method using a TaqMan probe was carried out in accordance with the "Pathogen Detection Manual 2019-nCoV Ver. 2.7" of the Institute of Infectious Diseases.
- Example 3 Confirmation of detection sensitivity of primer sets c and d The detection sensitivity was confirmed by the LAMP method.
- 1. Preparation of samples and reagents 1) Samples (transcribed RNA) Artificial genes incorporating the sequences of the M region and the S region were synthesized, and the transcribed RNA was used as a template. The synthesis of artificial genes was outsourced to Eurofins. The sequences of the artificial genes are shown in SEQ ID NO: 29 (artificial gene for detecting M region) and 30 (artificial gene for detecting S region).
- LAMP reaction reagent having the following composition was prepared.
- LAMP reaction reagent 20 mM tricine (pH 8.6), 30 mM KCl, 0.1% Tween 20, 1.4 mM dNTPs, 8 mM sulfonyl4, 1.6 mM DTT, PPase 20mU Bst DNA polymerase 25U, RNase inhibitor 1.0U, AMV Reverse Transcriptase 1.0U
- primer set c or d a fluorescently labeled probe corresponding to the primer set, and SYTO TM 63 Red Fluorescent Nucleic Acid Stein were added, and a master mix prepared with purified water (DW) to a concentration of 15 ⁇ L / test (DW).
- Reaction by nucleic acid amplification method 1 Reaction measurement by LAMP method was evaluated at a reaction temperature of 63 ° C. using a real-time quantitative PCR system LightCyclor (registered trademark) 96 (manufactured by Roche).
- the minimum detection sensitivity that could be detected within 15 minutes was 25 copies / test in any system using any primer set.
- Example 2 Confirmation of cross-reactivity with SARS virus 38 species of respiratory-related bacteria and pathogenic microorganisms (Human coronavirus 229E, Human coronavirus OC43, Human coronavirus HKU1, Human coronavirus) at GGGenome (https://gggenome.dbcls.jp/ja/) NL63, SARS-coronavirus, SARS-coronavirus-2, MERS-coronavirus, Adenovirus, Human Metapneumovirus, Parainfluenza virus 1-4, Influenza A, Influenza B, Enterovirus, Respiratory syncytial virus, Rhinovirus, Chlamydia pneumonia, Haemophilus influenzae, Legionella pneumonia Mycobacterium tuberculosis, Streptococus pneumonia, Streptococcus pyrogenes, Bordetella pertussis, Mycoplasma pneumoniae, Pneumocystis jirovecii (PJP), Influenza
- SARS virus SARS-Coronavirus
- SARS virus template a transcribed RNA of an artificial gene incorporating the sequence of SARS virus (GenBank NC0047183.3) having high homology by region was used (synthesis request: Eurofins). Template amount was 1.0 ⁇ 10 7 copies / test.
- SARS-CoV-2 could be detected even in the mixed test.
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Abstract
Description
[1]SARS-CoV-2ウイルスをLAMP法により増幅して検出するためのプライマーセットであって、前記プライマーセットは、以下の(a)~(b)の領域から設計される少なくとも一つからなるプライマーセット。
(a)配列番号1の28976塩基から29211塩基までの領域
(b)配列番号1の15394塩基から15595塩基までの領域
[2]SARS-CoV-2ウイルスをLAMP法により増幅して検出するためのプライマーセットであって、前記プライマーセットは、以下の(a1)~(b1)の群から選択される少なくとも一つを含むプライマーセット。
(a1)配列番号2からなるF3プライマー、配列番号3からなるB3プライマー、配列番号4からなるFIPプライマー、及び配列番号5からなるBIPプライマーからなるプライマーセット。
(b1)配列番号8からなるF3プライマー、配列番号9からなるB3プライマー、配列番号10からなるFIPプライマー、及び配列番号11からなるBIPプライマーからなるプライマーセット。
[3]SARS-CoV-2ウイルスをLAMP法により増幅して検出するためのプライマーセットであって、前記プライマーセットは、以下の(a2)~(b2)の群から選択される少なくとも一つを含むプライマーセット。
(a2)[1]に記載の(a1)のプライマーセットに加えて、配列番号6からなるLFプライマー、配列番号7からなるLBプライマー。
(b2)[1]に記載の(b1)のプライマーセットに加えて、配列番号12からなるLFプライマー、配列番号13からなるLBプライマー。
[4][1]~[3]のいずれかに記載のプライマーセットを用いてLAMP法により増幅反応を行うことを特徴とするSARS-CoV-2ウイルスの検出方法。
[5][1]~[3]のいずれかに記載のプライマーセットを用いて、SARS-CoV-2ウイルスの標的核酸領域の増幅を検出することにより、SARS-CoV-2ウイルス感染の有無を検査することを特徴とするCOVID-19の検査方法。
[6]COVID-19の診断方法において、[1]~[3]のいずれかに記載のプライマーセットを含むことを特徴とするキット。
[7]SARS-CoV-2ウイルスをLAMP法により増幅して検出するためのプライマーセットであって、前記プライマーセットは、以下の(c)~(d)の領域から設計される少なくとも一つからなるプライマーセット。
(c)配列番号1の26767塩基から26977塩基までの領域
(d)配列番号1の24660塩基から24916塩基までの領域
[8]SARS-CoV-2ウイルスをLAMP法により増幅して検出するためのプライマーセットであって、前記プライマーセットは、以下の(c1)~(d1)の群から選択される少なくとも一つを含むプライマーセット。
(c1)配列番号14からなるF3プライマー、配列番号15からなるB3プライマー、配列番号16からなるFIPプライマー、及び配列番号17からなるBIPプライマーからなるプライマーセット。
(d1)配列番号21からなるF3プライマー、配列番号22からなるB3プライマー、配列番号23からなるB4プライマー、配列番号24からなるFIPプライマー、及び配列番号25からなるBIPプライマーからなるプライマーセット。
[9]SARS-CoV-2ウイルスをLAMP法により増幅して検出するためのプライマーセットであって、前記プライマーセットは、以下の(c2)~(d2)の群から選択される少なくとも一つを含むプライマーセット。
(c2)配列番号14からなるF3プライマー、配列番号15からなるB3プライマー、配列番号16からなるFIPプライマー、配列番号17からなるBIPプライマー、配列番号18からなるLFプライマー、及び配列番号19からなるLBプライマーからなるプライマーセット。
(d2)配列番号21からなるF3プライマー、配列番号22からなるB3プライマー、配列番号23からなるB4プライマー、配列番号24からなるFIPプライマー、配列番号25からなるBIPプライマー、配列番号26からなるLFプライマー、及び配列番号27からなるLBプライマーからなるプライマーセット。
[10][7]~[9]のいずれかに記載のプライマーセット及び蛍光標識プローブを含む、SARS-CoV-2ウイルスをLAMP法により増幅して検出するためのキット。
[11]プライマーセットが(c1)又は(c2)のプライマーセットであり、蛍光標識プローブが配列番号20からなるプローブである、[10]に記載のキット。
[12]プライマーセットが(d1)又は(d2)のプライマーセットであり、蛍光標識プローブが配列番号28からなるプローブである、[10]に記載のキット。
[13]COVID-19を検査するための、[10]~[12]のいずれかに記載のキット。
[14][7]~[9]のいずれかに記載のプライマーセット又は[10]~[13]のいずれかに記載のキットを用いて、LAMP法により増幅反応を行うことを特徴とするSARS-CoV-2ウイルスの検出方法。
[15][7]~[7]のいずれかに記載のプライマーセット又は[10]~[13]のいずれかに記載のキットを用いて、SARS-CoV-2ウイルスの標的核酸領域の増幅を検出することにより、SARS-CoV-2ウイルス感染の有無を検査することを特徴とするCOVID-19の検査方法。
実施例1.プライマーセットa及びbの検出感度の確認
LAMP法による検出感度の確認を行った。
1.試料及び試薬の調製
1)試料(転写RNA)
RNA鋳型は、SARS-CoV-2遺伝子からRT-PCRにより作製したcDNAをプラスミドに組み込み、該プラスミドDNAからRNAを転写及び精製することにより作製した。転写には、Script Max(登録商標)Thermo T7 Transcription Kit(東洋紡株式会社製、コード番号:TSK-101)を用い、RNA精製にはRNeasy(登録商標)Mini Kit(キアゲン社製、カタログ番号:No.74104)を用いた。精製したRNAから1μLあたり10コピーから103コピーまでの希釈液を調製して試料溶液とした。またYeast RNA溶液を0コピーの試料溶液(Negative Control)とした。
0.2mLの試薬チューブに、次の組成を有するLAMP反応試薬25μLを調製した。プライマーは、表1に示すプライマーセットaまたはbを用いた。
20mM トリシン(pH8.6)、
30mM KCl、
8mM MgSO4、
1.4mM dNTPs、
0.5% Tween20、
1.6mM DTT、
1.6μM FIPプライマー及びBIPプライマー、
0.2μM F3プライマー及びB3プライマー、
0.8μM ループプライマーF(LF)及びループプライマーB(LB)、
AMV Reverse Transcriptase 1.0U(20U/μL、Roche社製)、
Bst DNApolymerase 22.8U(New England Biolabs社製)、
RNase阻害剤(40U/μL、プロメガ社製)1μL、
RNA鋳型(100コピー)5μL、
1)LAMP法による反応
1.の2)で調製したLAMP反応試薬に、標的配列0または10~103コピーを含む試料溶液1μLを加え、最終反応溶液25μLとした。測定にはリアルタイム濁度測定装置 LoopampEXIA(登録商標)を用い、反応条件は63℃、60分とした。
各プライマーセットでの測定結果を表4に示す。N遺伝子を検出対象にしたプライマーセットaでは10コピーまで、RdRP遺伝子を検出対象にしたプライマーセットbでは50コピーまで検出できることがわかった。
感染研から分与されたウイルスゲノムRNAを用いて検出感度の検討を行った。併せてPCRも実施して検出感度の比較を行った
1.試料及び試薬の調製
1)試料(ゲノムRNA)
感染研から分与されたSARS-CoV-2のゲノムRNAを1μLあたり50コピーから1.6×103コピーまでの希釈液を調製して試料溶液とした。
2)LAMP法に用いる試薬組成及び濃度
実施例1と同様に反応試薬を調製した。プライマーセットはN遺伝子を検出対象にしたプライマーセットaを使用した。
3)PCRに用いる試薬組成及び濃度
感染研の「病原体検出マニュアル 2019-nCoV Ver.2.7」に則ってN遺伝子を検出対象とするプライマーと増幅試薬を調製した。
1)LAMP法による反応
実施例1と同様にリアルタイム濁度測定装置 LoopampEXIA(登録商標)で63℃、60分間増幅反応を実施した。
2)PCRによる反応
感染研の「病原体検出マニュアル 2019-nCoV Ver.2.7」に則って、TaqManプローブを用いたRT-PCR法を実施した。
各方法での測定結果を表5に示す。どちらの増幅方法も50コピーまでのゲノムRNAを検出できたが、LAMP法の方がPCRよりも短時間で検出することができた。
LAMP法による検出感度の確認を行った。
1.試料及び試薬の調製
1)試料(転写RNA)
M領域及びS領域の配列をそれぞれ組み込んだ人工遺伝子を合成し、その転写RNAを鋳型とした。人工遺伝子の合成はEurofins社に委託した。人工遺伝子の配列を配列番号29(M領域検出用人工遺伝子)及び30(S領域検出用人工遺伝子)に示す。
次の組成を有するLAMP反応試薬を調製した。
LAMP反応試薬:
20mM トリシン(pH8.6)、
30mM KCl、
0.1% Tween20、
1.4mM dNTPs、
8mM MgSO4、
1.6mM DTT、
PPase 20mU
Bst DNApolymerase 25U、
RNase阻害剤 1.0U、
AMV Reverse Transcriptase 1.0U
この反応試薬に、プライマーセットc又はd、プライマーセットに対応する蛍光標識プローブ、SYTOTM 63 Red Fluorescent Nucleic Acid Stainを添加し、15μL/testとなるように精製水(DW)で調製したマスターミックス(MM)を用い、そこにDW5μL、鋳型5μLの計25μLで1反応とした。反応試薬は氷上にて調製した。
マスターミックス(1反応あたりの量):
LAMP反応試薬 12.5μL
5μM SYTO 0.5μL
10μM プローブ 0.1μL
プライマーセット 適量
DW 合計15μL
1反応の量:
マスターミックス 15μL
DW 5μL
RNA鋳型 5μL
1)LAMP法による反応
測定は、リアルタイム定量PCRシステムLightCycler(登録商標)96(Roche社製)を用い、反応温度63℃にて評価した。
GGGenome(https://gggenome.dbcls.jp/ja/)にて、呼吸器関連菌や病原微生物38種(Human coronavirus 229E, Human coronavirus OC43, Human coronavirus HKU1, Human coronavirus NL63, SARS-coronavirus, SARS-coronavirus-2, MERS-coronavirus, Adenovirus, Human Metapneumovirus, Parainfluenza virus 1-4, Influenza A, Influenza B, Enterovirus, Respiratory syncytial virus, Rhinovirus, Chlamydia pneumonia, Haemophilus influenzae, Legionella pneumophila, Mycobacterium tuberculosis, Streptococus pneumonia, Streptococcus pyrogenes, Bordetella pertussis, Mycoplasma pneumoniae, Pneumocystis jirovecii (PJP), Influenza C, Parechovirus, Candida albicans, Corynebacterium diphtheriae, Legionella non-pneumophila, Bacillus anthracosis (Anthrax), Moraxella cararrhalis, Neisseria elongate and miningitidis, Pseudomonas aeruginosa, Staphylococcus epidermis, Staphylococcus salivarius, Leptospirosis, Chlamydia psittaci, Coxiella burneti (Q‐Fever), Streptococcus aureus)との交差性を、M領域及びS領域のそれぞれについて、in silicoにて確認した。
Claims (15)
- SARS-CoV-2ウイルスをLAMP法により増幅して検出するためのプライマーセットであって、前記プライマーセットは、以下の(a)~(b)の領域から設計される少なくとも一つからなるプライマーセット。
(a)配列番号1の28976塩基から29211塩基までの領域
(b)配列番号1の15394塩基から15595塩基までの領域 - SARS-CoV-2ウイルスをLAMP法により増幅して検出するためのプライマーセットであって、前記プライマーセットは、以下の(a1)~(b1)の群から選択される少なくとも一つを含むプライマーセット。
(a1)配列番号2からなるF3プライマー、配列番号3からなるB3プライマー、配列番号4からなるFIPプライマー、及び配列番号5からなるBIPプライマーからなるプライマーセット。
(b1)配列番号8からなるF3プライマー、配列番号9からなるB3プライマー、配列番号10からなるFIPプライマー、及び配列番号11からなるBIPプライマーからなるプライマーセット。 - SARS-CoV-2ウイルスをLAMP法により増幅して検出するためのプライマーセットであって、前記プライマーセットは、以下の(a2)~(b2)の群から選択される少なくとも一つを含むプライマーセット。
(a2)請求項2に記載の(a1)のプライマーセットに加えて、配列番号6からなるLFプライマー、配列番号7からなるLBプライマー。
(b2)請求項2に記載の(b1)のプライマーセットに加えて、配列番号12からなるLFプライマー、配列番号13からなるLBプライマー。 - 請求項1~3のいずれか1項に記載のプライマーセットを用いてLAMP法により増幅反応を行うことを特徴とするSARS-CoV-2ウイルスの検出方法。
- 請求項1~3のいずれか1項に記載のプライマーセットを用いて、SARS-CoV-2ウイルスの標的核酸領域の増幅を検出することにより、SARS-CoV-2ウイルス感染の有無を検査することを特徴とするCOVID-19の検査方法。
- 請求項1~3のいずれか1項に記載のプライマーセットを含むことを特徴とするCOVID-19を検査するためのキット。
- SARS-CoV-2ウイルスをLAMP法により増幅して検出するためのプライマーセットであって、前記プライマーセットは、以下の(c)~(d)の領域から設計される少なくとも一つからなるプライマーセット。
(c)配列番号1の26767塩基から26977塩基までの領域
(d)配列番号1の24660塩基から24916塩基までの領域 - SARS-CoV-2ウイルスをLAMP法により増幅して検出するためのプライマーセットであって、前記プライマーセットは、以下の(c1)~(d1)の群から選択される少なくとも一つを含むプライマーセット。
(c1)配列番号14からなるF3プライマー、配列番号15からなるB3プライマー、配列番号16からなるFIPプライマー、及び配列番号17からなるBIPプライマーからなるプライマーセット。
(d1)配列番号21からなるF3プライマー、配列番号22からなるB3プライマー、配列番号23からなるB4プライマー、配列番号24からなるFIPプライマー、及び配列番号25からなるBIPプライマーからなるプライマーセット。 - SARS-CoV-2ウイルスをLAMP法により増幅して検出するためのプライマーセットであって、前記プライマーセットは、以下の(c2)~(d2)の群から選択される少なくとも一つを含むプライマーセット。
(c2)配列番号14からなるF3プライマー、配列番号15からなるB3プライマー、配列番号16からなるFIPプライマー、配列番号17からなるBIPプライマー、配列番号18からなるLFプライマー、及び配列番号19からなるLBプライマーからなるプライマーセット。
(d2)配列番号21からなるF3プライマー、配列番号22からなるB3プライマー、配列番号23からなるB4プライマー、配列番号24からなるFIPプライマー、配列番号25からなるBIPプライマー、配列番号26からなるLFプライマー、及び配列番号27からなるLBプライマーからなるプライマーセット。 - 請求項7~9のいずれか一項に記載のプライマーセット及び蛍光標識プローブを含む、SARS-CoV-2ウイルスをLAMP法により増幅して検出するためのキット。
- プライマーセットが(c1)又は(c2)のプライマーセットであり、蛍光標識プローブが配列番号20からなるプローブである、請求項10に記載のキット。
- プライマーセットが(d1)又は(d2)のプライマーセットであり、蛍光標識プローブが配列番号28からなるプローブである、請求項10に記載のキット。
- COVID-19を検査するための、請求項10~12のいずれか一項に記載のキット。
- 請求項7~9のいずれか一項に記載のプライマーセット又は請求項10~13のいずれか一項に記載のキットを用いて、LAMP法により増幅反応を行うことを特徴とするSARS-CoV-2ウイルスの検出方法。
- 請求項7~9のいずれか一項に記載のプライマーセット又は請求項10~13のいずれか一項に記載のキットを用いて、SARS-CoV-2ウイルスの標的核酸領域の増幅を検出することにより、SARS-CoV-2ウイルス感染の有無を検査することを特徴とするCOVID-19の検査方法。
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| WO2022040270A1 (en) * | 2020-08-18 | 2022-02-24 | Dynamic Combinatorial Chemistry Llc | Processes to detect coronaviruses |
| JP2023046057A (ja) * | 2021-09-22 | 2023-04-03 | 学校法人 名城大学 | 標的配列の検出方法及び標的配列の検出装置 |
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| CN115058542A (zh) * | 2022-06-24 | 2022-09-16 | 中国科学院苏州生物医学工程技术研究所 | 用于SARS-CoV-2检测的LAMP引物组 |
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Cited By (5)
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| WO2022040270A1 (en) * | 2020-08-18 | 2022-02-24 | Dynamic Combinatorial Chemistry Llc | Processes to detect coronaviruses |
| JP2023046057A (ja) * | 2021-09-22 | 2023-04-03 | 学校法人 名城大学 | 標的配列の検出方法及び標的配列の検出装置 |
| JP7825255B2 (ja) | 2021-09-22 | 2026-03-06 | 学校法人 名城大学 | 標的配列の検出方法及び標的配列の検出装置 |
| CN114015810A (zh) * | 2021-12-03 | 2022-02-08 | 浙江大学 | 冠状病毒rna双基因同时检测及突变毒株识别的检测试剂盒 |
| CN114015810B (zh) * | 2021-12-03 | 2022-08-05 | 浙江大学 | 冠状病毒rna双基因同时检测及突变毒株识别的检测试剂盒 |
Also Published As
| Publication number | Publication date |
|---|---|
| US20230125553A1 (en) | 2023-04-27 |
| EP4116438A1 (en) | 2023-01-11 |
| JP2023113880A (ja) | 2023-08-16 |
| EP4116438A4 (en) | 2024-04-03 |
| JP7313537B2 (ja) | 2023-07-24 |
| JPWO2021177372A1 (ja) | 2021-09-10 |
| US12410488B2 (en) | 2025-09-09 |
| CN115176036A (zh) | 2022-10-11 |
| US20250333809A1 (en) | 2025-10-30 |
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