CN104818320B - Primer, probe, detection architecture and the kit of disposable detection lung cancer multiple gene - Google Patents

Primer, probe, detection architecture and the kit of disposable detection lung cancer multiple gene Download PDF

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CN104818320B
CN104818320B CN201410727044.4A CN201410727044A CN104818320B CN 104818320 B CN104818320 B CN 104818320B CN 201410727044 A CN201410727044 A CN 201410727044A CN 104818320 B CN104818320 B CN 104818320B
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CN104818320A (en
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江风阁
林清华
黄蛤目
施伟杰
宋庆涛
阮力
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Xiamen Aide Biomedical Technology Co.,Ltd.
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Amoy Diagnostics Co Ltd
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Abstract

The invention discloses a kind of primer, probe, detection architecture and kit for detecting lung cancer multiple gene, including for detecting the 25 kinds of mutation of lung cancer EGFR gene, the 7 kinds of mutation of KRAS genes and 5 kinds of 6 kinds of gene mutations of BRAF, 9 kinds of gene mutations of NRAS, HER2 gene mutations, the primer, probe and its method for salary distribution of 5 kinds of fusions of 2 kinds of gene mutations of PIK3CA and ALK, 13 kinds of fusions of ROS1 and 6 kinds of fusions of RET.The detection kit of the present invention detects the multiple gene of a sample using 12 PCR reaction bar designs, each 12 PCR bar, and 1 No. 4 pipes of 12 bracings are built with corresponding fusion detection reagent and internal control reagent.The present invention can realize the 24 kinds of fusions and 54 kinds of mutation of disposable detection lung cancer, substantially reduce the time of detection, and high sensitivity, high specificity is simple and efficient to handle, tumor-targeting drug treatment can be selected to provide reference patients with lung cancer for clinician.

Description

Primer, probe, detection architecture and the kit of disposable detection lung cancer multiple gene
Technical field
The invention belongs to biological technical field, more particularly to the primer, probe and detection architecture of lung cancer multiple gene.
Background technology
Lung cancer is one of the incidence of disease and case fatality rate highest malignant tumour, wherein non-small cell lung cancer in malignant tumour (NSCLC) 85% of lung cancer or so is accounted for.With being deepened continuously to Tumorigenesis and its biological behaviour research, Ren Menyue Come more molecular targeted therapies focus gathered to specific high, adverse reaction with the characteristics of light.In recent years, in lung cancer molecular target To therapy field, study hotspot is concentrated mainly on the target spots such as EGFR, ALK, ROS1, KRAS, BRAF, the mutation of these genes or The effect of Fusion Strain is to targeted drug is related, and polygenic joint-detection can further improve the accuracy of prediction prognosis.So And at present mostly can only detect every time one mutation or one section of gene mutation, detection flux it is low, can only examination one by one, take It is long.Simultaneously as patients with terminal materials are more difficult, sample size is less, tends not to the needs for meeting examination one by one, and clinically still It can not simultaneously, disposably complete the kit detected to this 9 focus genes.
The present invention provides the primer for being used to disposably detect multiple lung cancer gene of a kind of high sensitivity and high specific, visited Pin, kit and the primer method of salary distribution.The detection kit carries out gene mutation using DNA sample and RNA samples carry out gene The detection of fusion, specificity and high sensitivity, testing result is reproducible, and introduces detection technique of fluorescence, overcomes biography Unite PCR primer carryover contamination the problem of, it is simple and efficient to handle, be clinical EGFR, ALK, ROS1, RET, KRAS, BRAF, NRAS, The detection of 9 kinds of gene mutation/fusions of HER2, PIK3CA provides a kind of fast and reliable detection method.This method can be realized The multiple gene of disposable detection lung cancer, the time of detection is substantially reduced, improve sensitivity and the standard of lung cancer genetic test True rate, the formulation of lung cancer clinical therapeutic scheme and chemotherapy prognosis are instructed so as to realize.
The content of the invention
It is an object of the invention to provide a kind of primer, probe for being used to disposably detect multiple lung cancer gene, including Primer, probe and the method for salary distribution of the focus gene such as EGFR, BRAF, KRAS, ALK and ROS1, its sequence such as table 1:
The primer of table 1, probe and sequence number
E-20-M2-P-HEX
K-EX4-P-C-HEX
Another object of the present invention is to provide to detect the kit of multiple lung cancer gene.This kit includes two portions Point:RNA fusions detect and DNA detection in Gene Mutation, include the bases such as EGFR, KRAS, BRAF, HER2, ALK, ROS1, RET Specific primer, the novel probe of cause, in addition to PCR buffer solutions, UNG enzymes etc..Kit is designed using 12 PCR reaction bars, Wherein RNA fusions detection by 12 PCR react bar 1. -4. a number pipe form, wherein 1. a number pipe is detected by ALK fusion gene Reagent and internal control detection reagent composition, 2. and 3. a number pipe is all made up of ROS1 fusions detection reagent and internal control detection reagent, 4. number pipe is made up of RET fusions detection reagent and internal control detection reagent.1. -4. number pipe fusion detection reagent is by FAM Signal designation, internal control detection reagent is used to monitor sample rna quality and adds situation, by HEX (VIC) signal designation;DNA genes Abrupt climatic change by 12 PCR react bar 5.~Number pipe composition, wherein 5.~FAM the and HEX signals of number pipe indicate respectively EGFR, KRAS, BRAF, NRAS, HER2 and PIK3CA different genes mutational site,Number pipe is by expanding the not mutated areas of EGFR Detection reagent forms, for Quality Control DNA extraction quality, also by FAM and HEX signal designations.
Each pattern detection needs 1 12 PCR reaction bar.This kit forms refers to table 2 and table 3.The present invention passes through Disposably to the detection of Gene Fusion in gene mutation in sample DNA and RNA, the formulation of lung cancer clinical therapeutic scheme and chemotherapy are instructed Prognosis.
The kit forms of table 2
The PCR of 3 LMG of table 12 react bar constituent
All fused type information of the kit of table 4 detection
All mutation type information of the kit of table 5 detection
Another aspect of the present invention provides a kind of reaction system for being used to disposably detect lung cancer genetic test, specific as follows:
1. fusion
DEPC H2O
10 × PCR buffer solutions
Wherein, LMG mixed enzymes A composition such as table 6:
The LMG mixed enzymes A of table 6 is formed
Material Concentration Dosage (μ L)
Hs-taq enzymes 5U/μL 0.25-0.30
UNG enzymes 1U/μL 0.02-0.06
Reverse transcriptase 0.1-1.0
Preferably, LMG mixed enzymes A composition is 0.26 μ L, UNG enzyme of Hs-taq enzymes 0.03 μ L, the μ L of reverse transcriptase 0.5;
2. mutator
H2O
5 × PCR buffer solutions
Wherein, LMG mixed enzymes A composition such as table 7:
The LMG mixed enzymes B of table 7 is formed
Material Concentration Dosage (μ L)
Hs-taq enzymes 5U/μL 0.20-0.25
UNG enzymes 1U/μL 0.02-0.08
Preferably, LMG mixed enzymes B composition is the μ L of 0.20 μ L, UNG enzyme of Hs-taq enzymes 0.05.
The application method of kit of the present invention comprises the following steps:
1. DNA and RNA in extraction detection sample, including it is fresh pathological tissue, paraffin-embedded tissue or paraffin section, complete DNA and RNA in the tissue such as blood, blood, blood plasma pleural effusion.
2. DNA and RNA are mixed according to corresponding ratio with mixed enzyme respectively, and it is added to 12 PCR reaction bars.
3. the Ct values shown according to fluorescent PCR amplification instrument judge testing result:
The beneficial effects of the invention are as follows:
The present invention uses specific primer and novel probe technology, Two Colour Fluorescence Air conduct measurement pattern, eliminates internal control base Cause, more mutators can be examined, cover more polygenes, detect ALK altogether, tri- fusions of ROS1, RET and EGFR, Six mutators of KRAS, NRAS, BRAF, HER2, PIK3CA, altogether 24 kinds of fusions and 54 kinds of mutation.The method:(1) establish Real-time PCR system, can disposably detect lung cancer multiple gene, including 25 kinds of mutation of EGFR gene, 7 kinds of KRAS genes are prominent Change, 9 kinds of NRAS and 6 kinds of gene mutations of BRAF, the mutation of HER25 kinds, 2 kinds of mutation of PIK3CA and 5 kinds of fusions of ALK, 6 kinds of fusions of ROS113 kinds fusion and RET (be shown in Table 4 and table 5);Can be that clinician selects to swell to patients with lung cancer The treatment of knurl targeted drug provides reference.According to each gene mutation and the incidence of each Gene Fusion, detection that this kit includes Site can cover about 70% Patients with Non-small-cell Lung.
The present invention according to influencing each other between the detection complexities of the multiple mutation/position of fusion detected, primer, Many-sided composite factors such as competition, 115 sequences (including primer and probe) are grouped, are sub-packed in 12 bracings, its advantage exists In:(1) after packet, will not be interfered with each other between group primer;(2) design of shared upstream or anti-sense primer;Make Mutational site (such as n) as much must be identified, primer bar number used is minimum (only need n+1, and usually require 2n), Can be with cost-effective.(3) 12 bracings are used, disposably detect multiple mutation/position of fusion, and establish 12 unions respectively manage it is general Amplification program, make that each pipe amplification program is consistent, operation is consistent, can save the plenty of time.Detected in (4) 12 pipes containing external control System, as to reagent, sample DNA quality, sample rna quality and the Quality Control of operation itself, the detection zone of selection is people The relatively conservative section of genoid, about 100bp, even if so DNA/RNA has degraded, external control remains able to most truly react The effective DNA and RNA amounts of EGFR/KRAS/BRAF/ALK/ROS1 genes;(5) high sensitivity, to 1% gene mutation DNA and The fusion RNA of 50 copies can be detected;(6) high specificity, 10ng wild type gene group DNA and 5 μ g wild type rna Non-specific signals will not be produced;(7) detection time is short, and detection process only needs to complete for 120 minutes;(8) using pre- point Dress, and sealing wax processing is carried out, the security of transportation can be improved, while experiment process operation can be made easy.
Brief description of the drawings
Fig. 1 is a part for the sensitivity map of each detection plasmid in embodiment 1, wherein:
Fig. 1-1 ALK fusion genes-EML4 exon 13;ALK exon 20
Fig. 1-2 ROS1 fusions-CD74 exon 6;ROS1 exon 32
Fig. 1-3 RET fusions-KIF5B exon 16;ROS1 exon 12
Fig. 1-4 EGFR genetic mutations-L861Q
Fig. 1-5 KRAS gene mutations G12D
Fig. 1-6 BRAF gene mutations V600E1
Fig. 1-7 HER2 gene mutations G776>VC
Fig. 1-8 NRAS gene mutations Q61R
Fig. 1-9 PIK3CA-M1 gene mutations H1047R
Fig. 2 is a part for the PCR figures of each detection plasmid in embodiment 1, wherein:
Fig. 2-1 ALK fusion genes-EML4 exon 13;ALK exon 20
Fig. 2-2 ROS1 fusions-CD74 exon 6;ROS1 exon 32
Fig. 2-3 RET fusions-KIF5B exon 16;ROS1 exon 12
Fig. 2-4 EGFR genetic mutations-L861Q
Fig. 2-5 KRAS gene mutations G12D
Fig. 2-6 BRAF gene mutations V600E1
Fig. 2-7 HER2 gene mutations G776>VC
Fig. 2-8 NRAS gene mutations Q61R
Fig. 2-9 PIK3CA gene mutations H1047R
Fig. 3 is a part for clinical sample testing result positive PCR figures in embodiment 2, wherein:
The HER2 gene mutations of Fig. 3-1 samples 1
The A of Fig. 3-2 samples 2, ALK fusion gene;B, ROS1 fusions
The A of Fig. 3-3 samples 3, ALK fusion gene;B, EGFR genetic mutation
Wherein, the abscissa of each figure is period (cycles);Ordinate is fluorescent value, Fluorescence (dR)。
Embodiment
Below in conjunction with specific embodiment, the present invention is expanded on further.It should be understood that these embodiments be only used for the present invention and It is not used in limitation the scope of the present invention.Unless otherwise defined or described herein, the scientific and technical term described in this patent and this area are general Logical technical staff is understood with identical implication.
Embodiment 1
The human EGFR announced according to Cosmic data, KRAS, BRA, ALK and ROS1 are wildtype gene sequence, with Based on EGFR, KRAS, BRA, ALK and ROS1 driven nature mutational site and position of fusion, to design specific primer and new Type probe (be shown in Table 1 and table 8).
8 each pipe of table is distributed
The present embodiment is respectively with EML4 exon 13;ALK exon 20 (ALK fusion gene), CD74 exon 6; ROS1exon 32 (ROS1 fusions), KIF5B exon 16;ROS1 exon 12 (RET fusions), L861Q (EGFR Gene mutation), G12D (KRAS gene mutation), V600E1 (BRAF gene mutation), G776>VC (HER2 gene mutations), Q61R Illustrate that the fluorescent PCR of the present invention detects above-mentioned lung cancer base exemplified by (NRAS gene mutations), H1047R (PIK3CA gene mutations) Cause.
Experiment is included with the armoring RNA containing above-mentioned fusion and the plasmid template being respectively mutated, the detection of its fluorescent PCR respectively Following steps:
(1) plasmid, armoring RNA processing and extraction:
Each plasmid and armoring RNA extraction are extracted using extracts kit, and specific operating procedure of extracting presses kit Specification operates.After DNA and RNA extractions terminate, immediately using UV spectrophotometer measuring DNA and RNA concentration and purity. DNA and RNA OD260/OD280 should be between 1.8~2.1;RNA concentration should be between 50~500 ng/ μ L.
(2) pcr amplification reaction system is established:
By above-mentioned gained template, the template as real-time fluorescent PCR amplification, enter performing PCR amplification according to following amplification system:
1. fusion
DEPC H2O
10 × PCR buffer solutions
2. mutator
H2O
5 × PCR buffer solutions
Real-time PCR reactions condition is:
First stage:42 DEG C of 5min, 95 DEG C of 5min, 1 circulation;
Second stage:95 DEG C of 25s, 64 DEG C of 20s, 72 DEG C of 20s, 10 circulations;
Phase III:93 DEG C of 25s, 60 DEG C of 35s, 72 DEG C of 20s, 36 circulations;
Signal collection:FAM and HEX (or VIC) signal are collected during 60 DEG C of phase III, performs real-time PCR, preserves file.
(3) judgement of testing result:The Ct values shown according to fluorescent PCR amplification instrument judge testing result.
1. confirming non-selected correction fluorescence reference, single detection reaction tube is selected to be analyzed successively by pipe order, together When select positive control reaction tube, sample reaction tube and negative control pipe, then user can determine that amplification is bent according to actual conditions At the flex point that line rises, the Ct values of each reaction tube are obtained.
2. negative control 1.~FAM signals of number pipe and 5.~The HEX signals of number pipe should rise without amplification curve, if Any one above-mentioned signal of pipe has amplification curve rise, then this time experimental result is invalid, it is proposed that detects again;1. if~4. number pipe HEX signals andFAM the and HEX signals of number pipe have amplification curve rise once in a while, this category normal phenomenon, do not influence to testing result Judgement.
3. positive control 1.~FAM, HEX signal of number pipe should all have amplification curve rise, and Ct values are general Less than 30, but may be fluctuated because different threshold values are set.
4. sample 1.~4. number pipe ALK, ROS1 and RET Gene Fusion negative and positive sex determination:
(1) sample 1.~4. number pipe HEX amplification of signal curves:
A) if three pipe Ct values≤27, continue to analyze;
If b) any one pipe Ct values > 27, illustrate that RNA there may be fragmentation or degraded or inhibitor or leakage adds, if FAM Amplified signal rises and fallen in positive region, and experimental result is still credible, otherwise suggests detecting again or extracts again after RNA again Detected.
(2) sample 1.~4. number pipe FAM amplification of signal curves:
A) if 1. number pipe FAM signal Ct values < 35, the sample contain ALK gene fusion, otherwise, melted without ALK gene Close;
If b) 2. or 3. number pipe FAM signal Ct values < 35, the sample contains ROS1 Gene Fusions,
Otherwise, without ROS1 Gene Fusions.
If c) 4. number pipe FAM signal Ct values < 35, the sample contains RET Gene Fusions, otherwise, melts without RET genes Close.
5. sample 5.~Number pipe gene mutation negative and positive sex determination (such as table 9):
(1) sampleNumber pipe FAM amplification of signal curves:
If a) 20≤Ct value≤26 of number pipe FAM signals, then continue to analyze;
If b)The Ct values < 20 of number pipe FAM signals, illustrate that the DNA added is excessive, DNA additions should be reduced and carry out reality again Test.But for jump signal without rising or falling in negative area, the experimental result is still credible;
If c)The Ct values > 26 of number pipe FAM signals, illustrate that the DNA added there may be fragmentation or degraded or inhibitor Or leakage adds, if jump signal has rise and fallen in strong positive region, experimental result is still credible, otherwise suggests increase DNA applied sample amounts Or again extract DNA after detected again.
(2) sample 5.~Number pipe FAM and HEX amplification of signal curve:First determine sample 5.~Number pipe FAM and HEX The respective Ct values of signal, it is then determined that the sampleThe Ct values of number pipe FAM and HEX signal.Due to being mutated percentage composition in sample Different, resulting mutation Ct values are also different.According to different mutation Ct values, pattern detection result is divided into the moon Property, weak positive and strong sun.It is specific to judge to be shown in Table 9.
A) when sample mutation Ct values are more than or equal to negative critical value, then the sample is for feminine gender or less than this kit Monitoring lower-cut;
B) when sample mutation Ct values are less than negative critical value, following judgement is carried out:
I. when the mutation Ct values of some reaction tube are less than strong positive critical value, then the sample is to be dashed forward corresponding to the reaction tube Become positive, i.e., strong sun;
Ii. when the mutation Ct values of reaction tube are more than or equal to strong positive critical value, then the Δ Ct values of the reaction tube are calculated. If the Δ Ct values of reaction tube are less than corresponding Δ Ct Cut-off values, also mutation is positive corresponding to the reaction tube for the sample Property, i.e., weak sun;It is on the contrary then be the negative or Monitoring lower-cut less than this kit.
C) calculating of Δ Ct values:Δ Ct values=be mutated Ct values-external control Ct values.Mutation Ct values refer to sample jump signal (FAM Or HEX signals) corresponding to Ct values;External control Ct values refer to the Ct values of external control signal corresponding to sample (FAM or HEX signals).
6. a sample may contain 2 or multiple fusions or mutation type simultaneously.
The gene mutation result judgement of table 9
(3) 5~No. 11 pipe FAM amplification of signal curves of sample:
5~No. 11 respective Ct values of pipe FAM signals of sample are determined first, it is then determined that No. 12 pipe FAM signals of the sample Ct values.Due to being mutated in sample, percentage composition is different, and resulting mutation Ct values are also different.According to different mutation Ct values, pattern detection result is divided into negative, weak positive and strong sun.It is specific to judge to be shown in Table 9.
Sensitivity analysis:Concentration is the sample RNA/DNA of 1000 copies after learning from else's experience quantitatively, carries out 10 times of dilutions, then 3 concentration are detected respectively, RNA/5 μ L DNA are added per secondary response.As a result the spirit of the fluorescence PCR method of the present invention is shown Sensitivity is high, and 10 copy DNA genomes can detect, partial results such as Fig. 1.
Testing result shows that detection architecture of the invention disposably can accurately detect lung cancer multiple gene, the spirit of detection Sensitivity can reach 5-10 copies.
Embodiment 2
Clinical sample is detected with the present invention, in December, 2013~2014 year October is to 1100 clinical lung cancer FFPEs Tissue samples carry out multiple lung cancer detection in Gene Mutation.
First, sample DNA and RNA extraction are detected:Xiamen Ai De biological medicine science and technology can be used to have for DNA and RNA extraction FFPE sample DNAs/RNA of limit company isolates kit (Fujian tall building food medicine prison tool (standard) word 2013 the 1400070th), Cat No.ADx-FF03 or QIAGEN paraffin organization DNA extraction kits, Cat NO.56404;Enter according to the explanation of extracts kit Row operation.After DNA and RNA extractions terminate, immediately using UV spectrophotometer measuring DNA and RNA concentration and purity.DNA and RNA OD260/OD280 should be between 1.8~2.1;RNA concentration should be between 50~500 ng/ μ L.By the DNA and RNA of said extracted Fluorescent PCR amplification template as lung cancer gene.
2nd, by above-mentioned carried each DNA and RNA, performing PCR amplification is entered according to following amplification system respectively:
1. fusion
DEPC H2O
10 × PCR buffer solutions
2. mutator
H2O
5 × PCR buffer solutions
Real-time PCR reactions condition is:
First stage:42 DEG C of 5min, 95 DEG C of 5min, 1 circulation;
Second stage:95 DEG C of 25s, 64 DEG C of 20s, 72 DEG C of 20s, 10 circulations;
Phase III:93 DEG C of 25s, 60 DEG C of 35s, 72 DEG C of 20s, 36 circulations;
Signal collection:FAM and HEX (or VIC) signal are collected during 60 DEG C of phase III, performs real-time PCR, preserves file
3rd, the judgement of testing result:The Ct values shown according to fluorescent PCR amplification instrument judge testing result, and (determination methods are joined According to embodiment 1).
In the clinical sample of 1100 detected, 720 saltant types are detected altogether, and its total mutation rate is up to 65.5%.Its In, the ratio of detection EGFR mutation simultaneously and ALK fusions is up to 2.1%, while the ratio of ALK fusions and ROS1 fusions is 0.3%. In addition, the mutation example contrasting detection of 100 is carried out using direct sequencing, the results showed that system of the present invention and direct sequencing Coincidence rate reaches 100%, further demonstrates the accuracy of system detection of the present invention, the results are shown in Table 2.The detectable lung cancer of the present invention Multiple gene, easy to detect quick, accuracy is high, can meet lung cancer Gene Detecting.The fluorescence PCR method and tradition are sequenced The coincidence rate of methods and resultses is 100%, and fluorescent PCR sensitivity and selective enumeration method ability are higher than traditional sequencing methods.
9 testing result of the present invention of table is compared with direct sequencing

Claims (4)

1. the disposably primer and probe of detection lung cancer multiple gene, including following 115 sequences, and described sequence is divided into 13 Group, it is specific as follows:
2. the disposably reaction system of detection lung cancer genetic test, including
1. fusion
DEPC H2O
10 × PCR buffer solutions
Wherein, LMG mixed enzymes A composition is as follows:
Material Concentration Dosage μ L Hs-taq enzymes 5U/μL 0.25-0.30 UNG enzymes 1U/μL 0.02-0.06 Reverse transcriptase 0.1-1.0
2. mutator
H2O
5 × PCR buffer solutions
Wherein, LMG mixed enzymes B composition is as follows:
Material Concentration Dosage μ L Hs-taq enzymes 5U/μL 0.20-0.25 UNG enzymes 1U/μL 0.02-0.08
Wherein, described primer and probe is as shown in claim 1.
3. the reaction system of disposable detection lung cancer genetic test as claimed in claim 2, it is characterised in that the LMG of addition is mixed Synthase A composition is μ L of Hs-taq enzymes 0.26, μ L of UNG enzymes 0.03, the μ L of reverse transcriptase 0.5;LMG mixed enzymes B composition is Hs- μ L of taq enzymes 0.20, the μ L of UNG enzymes 0.05.
4. a kind of kit, including the nucleotides of 13 groups of sequences described in claim 1, this 13 groups of sequences are respectively charged into 12 unions It is interior, wherein, reaction solution 1.-reaction solutionAnd external control is separately added into the pipe in 12 unions, and internal control add reaction solution 1.-it is anti- In answering liquid 4..
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