CN104789696B - A kind of DNA aptamers and its screening technique and application for being used to detect grouper irido virus infection - Google Patents
A kind of DNA aptamers and its screening technique and application for being used to detect grouper irido virus infection Download PDFInfo
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Abstract
The present invention discloses a kind of DNA aptamers and its screening technique and application for being used to detect grouper irido virus infection.In every wheel screening process, the step of introducing counter-selection twice, the single-stranded DNA banks of previous round are combined with normal cell first, to remove the non-specific ssDNA combined with normal lithosporic fry cell, then by supernatant with being combined screening by the cell that grouper irido virus infects, the isolated ssDNA from the cell infected by grouper irido virus, is then combined, isolated supernatant with normal cell again.Prepare single-stranded DNA library in PCR amplifications library.Repeat the screening process of the above, compared with the normal cell number that the first round screens, the number of normal cell in screening process is improved 26 times, with the first round screen library compared with the binding time of cell, in subsequent screening process, library increases to 1h with normal cell binding time from 0.5h, and library foreshortens to 0.5h with virus infected cell binding time from 1h, to improve the screening efficiency often taken turns.
Description
Technical field：
The invention belongs to biology field, and in particular to one kind can be used for grouper in cellular level and tissue level
The DNA aptamers of irido virus (SGIV) infection detection and its screening technique and application.
Background technology：
Aptamer is the new detection of a class obtained by aglucon phyletic evolution technology (SELEX) screening of index concentration
And treatment tool.The aglucon phyletic evolution technology of index concentration is the biological libraries of the wide concerned new detection of a class and treatment
Technology.It is about 10 using artificial synthesized, capacity14~1015Random oligonucleotide library combined with target substance, through excessive
Wheel screening obtains the aptamer of target substance.The aptamer obtained using the technology screening is had and monoclonal antibody phase
When high specific and high-affinity, because screening is the chemical process that carries out in vitro, so from metal ion, organic dyestuff
Etc. simple system, to complex systems such as virus, cell, tissues, screening object can be used as, and aptamer is not immunized
Originality, denaturation caused by temperature change is reversible, and the short expense of screening time is low, and obtained aptamer is readily synthesized and repaiied
Decorations.Therefore, aptamer not only has bright prospects and noticeable in new drug development field, its biology in major disease
Medical basic research, medical diagnosis on disease field also show that wide application prospect.
China is aquaculture big country, and grouper is one of most rare marine fish, with high economic worth.
However, being broken out in recent years in grouper and popular irido virus etc. has seriously threatened the sea-farming of grouper, cause
Huge economic loss.At present in the world in the method master of aquatic animal disease, including grouper irido virus quick diagnosis
To include the conventional method based on bacteriology, virology, parasitology and histopathology, the immunology detection side based on antibody
Method, for Serologic detection technology and Protocols in Molecular Biology of the antibody of specified pathogen etc..These methods respectively have advantage
Simultaneously there is also wretched insufficiency, so must put forth effort that exploitation is new, specific stronger, sensitivity is higher, it is easier to operate
Aptamer infects to detect and control grouper irido virus (SGIV).
The content of the invention：
First purpose of the present invention be to provide a kind of high specific, high sensitivity, non-immunogenicity, stable easily modification,
The DNA aptamers for being used to detect grouper irido virus infection be easy to synthesize and preserved.
The DNA aptamers for being used to detect grouper irido virus infection of the present invention, its nucleotide sequence such as SEQ
ID NO：Shown in 1, the mark for detection is combined with described nucleotide sequence.
Any position on above-mentioned DNA aptamers, its nucleotide sequence can be phosphorylated, methylate, amination,
Thinization or isotopologue.
The described mark that is used to detect is preferably：Fluorescein isothiocynate (FITC), carboxyl tetramethylrhodamine
(TAMRA), biotin, digoxin, fluorescent material, nano luminescent material, polyethylene glycol, peptide fragment, albumen, folic acid or enzyme mark.
Above-mentioned DNA aptamers, whether through part substitution or after modification, all with former aptamer
Essentially identical or similar molecular structure, physicochemical property and function, can be used in grouper irido virus (SGIV) detection.
Second object of the present invention provides a kind of screening technique of above-mentioned DNA aptamers, it is characterised in that including
Following steps：
(1) following random single-stranded DNA banks and primer, are synthesized：
Random library Library50：
5’-GACGCTTACTCAGGTGTGACTCG(50N)CGAAGGACGCAGATGAAGTCTC
5 ' primers：5’-FITC-GACGCTTACTCAGGTGTGACTCG-3’；
5 ' primers：5’-TAMRA-GACGCTTACTCAGGTGTGACTCG-3’；
3 ' primers：5’-Biotin-GAGACTTCATCTGCGTCCTTCG-3’；
(2), Cell-SELEX screening processes：Normal grouper splenocyte GS cells are infected with grouper irido virus,
Cell continues to cultivate 48h, infected GS cells is washed with buffer solution after removing culture medium, by the random library in step (1)
On ice, hatching combination 0.5h obtains supernatant with normal GS cells first after dissolving, then enters supernatant with infected GS cells
Row hatching combination 1h, removes liquid and GS cells is washed with buffer solution, then by the GS cells after washing in 85 after the completion of incubation
~94 DEG C of 2~10min of heating, centrifugation obtains supernatant 1, by supernatant 1 and normal GS cells in hatching combination on ice, with obtaining
The identical method of supernatant 1 obtains supernatant 2, is the specific nucleic acid aptamers library of the GS cells infected by irido virus；
(3), amplified library：The specific nucleic acid obtained using screening in the primer pair step (2) of the synthesis in step (1)
Performing PCR amplification is entered in aptamers library, obtains amplified production double-stranded DNA；
(4), the preparation in the single-stranded libraries of DNA：The magnetic bead that streptavidin is marked is with the double-stranded DNA in step (3) normal
Temperature is lower to be incubated, and using the affinity interaction of streptavidin on the mark and magnetic bead on double-stranded DNA, double-stranded DNA is attached into magnetic bead
Surface, in magnetic bead add alkaline reaction after, recovery obtain supernatant, by supernatant by except salt plug be collected into it is mono- containing DNA
The solution in chain library；
(5) multi-turns screen, is repeated：The single-stranded libraries of DNA collected in step (4) are replaced to the random library in step (2),
Above step (2)-(4) are repeated at least 14 times, compared with the normal cell number that the first round screens, by normal GS in screening process
The number of cell improves 2-6 times, with first round screening library compared with the binding time of cell, in subsequent screening process
In, library increases to 1h with normal GS cells binding time from 0.5h, and library is shortened with virus infected cell binding time from 1h
To 0.5h, to improve the screening efficiency often taken turns, that is, the DNA aptamers for detecting grouper irido virus infection are obtained.
It is preferred that, the culture medium described in step (2) is L15 culture mediums.
It is preferred that, the buffer solution described in step (2) is PBS.
It is preferred that, the PCR amplifications described in step (3), its amplification system is 1000 μ l：10 × buffer 100 μ l, dNTP
(2.5mM) 80 μ l, the μ l of template 100, the μ l of 5 ' primer 30,3 ' primer, 30 μ l, rTaq enzyme 10 μ l, dsH2O 650μl；Amplification program
For：94 DEG C of 2min, 94 DEG C of 1min, 60 DEG C of 30sec, 72 DEG C of 1min, are circulated, 72 DEG C of 5min by 12 wheels.
Recovery described in step (4) obtains supernatant, is preferably reclaimed by magnetic separation rack.
Third object of the present invention is to provide a kind of kit for being used to detect grouper irido virus infection, its feature
It is to contain above-mentioned SEQ ID NO：DNA aptamers shown in 1.
Fourth object of the present invention is to provide the above-mentioned DNA aptamers for being used to detect grouper irido virus infection
Application in the infection detection of grouper irido virus is carried out.
The present invention by the single-stranded library of random dna first with normal cell on ice be incubated after, the supernatant 1 being recovered to it is sick
The GS cells of poison infection are incubated on ice, and collecting infecting cell is high-temperature denatured to be recovered to after supernatant 2, again with normal cell on ice
It is incubated, so as to remove the non-specific single stranded DNA combined with normal cell to greatest extent, realizes the purpose for improving screening efficiency.
Compared with prior art, the advantage of the invention is that：The present invention is obtained by the cell SELEX screenings of optimization
Aptamer, has higher affinity and specificity compared with existing protein antibodies, but also with protein antibodies institute
The characteristics of not possessing, including non-immunogenicity；Molecular weight is small, is easy to iii vitro chemical to synthesize；It is easy to the difference to aptamer
Position is modified and replaced；Sequence is stable and easy to transport and preserved；Short preparation period, favorable reproducibility；It is easy to mark etc..Using
It is simple to operate rapid when the aptamer of the present invention carries out the infection detection of grouper irido virus, can be in cellular level
With the infection that irido virus is detected in tissue level, dissociation constant is applied to related inspection within nanomolar range
Test agent box.The quick detection that this infects for irido virus is significant, and the detection field infected in irido virus has
Good application prospect.
Brief description of the drawings：
Fig. 1 is the 9th wheel of flow cytomery fluorescein isothiocynate (FITC) mark in the embodiment of the present invention, 10
Wheel, 11 wheels, 12 wheels, 13 wheels, the combination situation of 14 wheel screening libraries and the GS cells infected by irido virus, wherein, A is infects
SGIV GS target cells, B is normal GS control cells；
Fig. 2 is fluorescein isothiocynate (FITC) mark that flow cytomery screening is obtained in the embodiment of the present invention
The testing result of the aptamer of sequence 1 and the GS cell binding abilities infected by irido virus；
Fig. 3 is the aptamer and quilt of the sequence 1 of carboxyl tetramethylrhodamine (TAMRA) mark in the embodiment of the present invention
Irido virus infection GS cells, (two groups of pictures in figure, the left side is light field to normal GS cell dyeings fluorescence intensity comparison in difference
Imaging, the right is the imaging of fluorescence channel, is the information of different passages in same photo)；
Fig. 4 is the aptamer and quilt of the sequence 1 of carboxyl tetramethylrhodamine (TAMRA) mark in the embodiment of the present invention
The grouper liver organization of irido virus infection, normal grouper liver organization fluorescent staining strength difference compare (two in figure
Group picture, the left side is the imaging of light field, and the right is the imaging of fluorescence channel, is the information of different passages in same photo).
Embodiment：
Following examples are that the present invention is further illustrated, rather than limitation of the present invention.In following examples
Experimental method unless otherwise specified, is conventional method.Experiment material in following examples is from normal unless otherwise specified,
Obtained by the biochemical reagents company purchase of rule.
Embodiment 1：
1st, the random single-stranded DNA banks and primer shown in following sequence are synthesized
Random library Library50：
5’-GACGCTTACTCAGGTGTGACTCG(50N)CGAAGGACGCAGATGAAGTCTC
5 ' primers：5’-FITC-GACGCTTACTCAGGTGTGACTCG-3’；
5 ' primers：5’-TAMRA-GACGCTTACTCAGGTGTGACTCG-3’；
3 ' primers：5’-Biotin-GAGACTTCATCTGCGTCCTTCG-3’；
2nd, Cell-SELEX screenings obtain specific recognition by the aptamer of the SGIV GS cells infected
10% hyclone culture GS cells are added in 2.1 L15 culture mediums to confluent cultures bottom of bottle 95%, in blake bottle
Middle addition grouper irido virus (SGIV), grouper irido virus infects normal grouper splenocyte GS cells, continues to train
Support after 48h, remove the culture medium in the blake bottle for the cell being infected, infected GS cells are washed with 15ml PBS；
2.2 are dissolved in the above-mentioned random libraries of 10nmol in 300 μ l binding buffer, 95 DEG C of waters bath with thermostatic control
5min, is then rapidly inserted into ice, ice bath 10min, and 1mL is supplemented to binding buffer, by the random library after processing
With being incubated 1h on ice by the SGIV GS cells infected in 2.1；
After the completion of 2.3 hatching combinations, the liquid in blake bottle is removed, cell in blake bottle is washed with 10mL PBS；
Cell is scraped and mixed in 1mL PBS with cell scraper, cell is mixed into liquid is transferred in EP pipes, 94 DEG C of waters bath with thermostatic control
Supernatant is collected by centrifugation in 5min, 12000g, as infects the specific nucleic acid aptamers storehouse of SGIV GS cells.
3rd, PCR amplifications screening library
Performing PCR amplification is entered in the specific nucleic acid aptamers storehouse for taking 200 μ l to screen obtained infection SGIV GS cells, specifically
Expanding bar program is：94 DEG C of 2min, 94 DEG C of 1min, 60 DEG C of 30sec, 72 DEG C of 1min, are circulated, 72 DEG C of 5min by 12 wheels.First
The supernatant obtained after wheel screening, will be completely used for expanding into performing PCR, obtain amplified production.
4th, the preparation in the single-stranded libraries of DNA
The magnetic bead that 100 μ l streptavidins are marked is incubated at normal temperatures with the double-stranded DNA obtained by PCR amplifications in step 3
30min, using the affinity interaction of streptavidin on the biotin and magnetic bead on double-stranded DNA, magnetic bead table is attached to by double-stranded DNA
Face, EP pipes are placed on magnetic separator and remove supernatant, and magnetic bead is washed with 1mLPBS, then add 400ul in EP pipes
200mM NaOH solutions, normal-temperature reaction 15min is reclaimed using magnetic separation rack and is obtained supernatant；Except the salt plug sterile washings of 10mL
After washing, supernatant is added and removes salt plug, is dripped off naturally by Action of Gravity Field.1mL sterilized waters are added, are collected into containing the single-stranded texts of DNA
The solution in storehouse.
5th, as above repeated screening
The single-stranded libraries of the DNA obtained in step 4 are replaced into the random library in step (2), the sun shown in repeat step 2-4
Property screening process, PCR amplifications and single-stranded DNA banks producing process 14 times.
6th, negative screening
It is control with normal GS cells in being screened after the second wheel and the second wheel, screening after step 5 is obtained
The single-stranded libraries of DNA carry out negative screening to improve screening efficiency.Specifically feminine gender screening process is：Culture GS cells are to being paved with training
Bottom of bottle is supported, cell is washed with 15ml PBS；To screen obtain DNA library dissolving, after 95 DEG C of waters bath with thermostatic control, ice baths, it is and premenstrual
State the normal GS cells after processing and 0.5h is incubated on ice, the solution after cell incubation is collected after the completion of incubation；Then it is this is molten
Liquid carries out ice bath combination 1h with the GS cells infected by SGIV；The GS cells for infecting SGIV are heated through 85~94 DEG C of waters bath with thermostatic control
2~10min, 12000g are collected by centrifugation after supernatant 1, then by this supernatant 1 and normal GS cells of another bottle after aforementioned processing
1h is incubated on ice, the supernatant 2 being collected into is the core of the GS cells of the high specific identification infection SGIV by counter-selection twice
Sour aptamers.
7th, 15 wheel screening
By the supernatant solution being collected into step 6, prepared by the single-stranded DNA banks of PCR amplifications and step 4 by step 3
Afterwards, it is repeated in carrying out the process of step 6, step 2, step 3 and step 4, using library obtained by Flow cytometry to sense
The enhancing situation of SGIV GS cell recognition abilities is contaminated, compared with the normal cell number that the first round screens, by screening process
The number of normal GS cells improves 2-6 times, with first round screening library compared with the binding time of cell, in subsequent screening
During, library and normal GS cells binding time increase to 1h from 0.5h, and library and virus infected cell binding time are from 1h
0.5h is foreshortened to, to improve the screening efficiency often taken turns, until after 15 wheel screenings, GS cell recognition energy of the library to infected SGIV
Power reaches most strong.After gained amplified production is analyzed through cloning and sequencing, finally give the present embodiment 1 can be used for detection SGIV
The aptamer of infection, sequence such as SEQ ID NO：Shown in 1.
8th, the enrichment condition in Flow cytometry screening process amplifying nucleic acid aptamers library is utilized
The GS cells for infecting SGIV are handled with without enzymic digestion liquid, 1000g is centrifuged off supernatant, uses 5mLPBS centrifuge washings
Three times.By 300nM fluorescein isothiocynates (FITC) mark the 9th wheel, 10 wheel, 11 wheel, 12 wheel, 13 wheel, 14 wheel screening libraries
Be dissolved in 1mL binding buffer, then with the cell after above-mentioned processing in hatching combination 30min on ice, 1000g from
The heart removes supernatant, and with 5mLPBS centrifuge washings three times, most cell is mixed in 500 μ l PBS at last, for flow cytomery.
Cell to be combined with Library compares 2, testing result is as schemed with each wheel library as control 1 with being combined into for normal GS cells
Shown in 1.As a result, it was confirmed that this is by the screening of 14 wheels, and obtained screening library has stronger to the GS target cells for infecting SGIV
Specific recognition capability (Figure 1A), and to normal GS control cells without identification (Figure 1B).
9th, it is adapted to using the nucleic acid of four fluorescein isothiocynate (FITC) marks in Flow cytometry the present embodiment
Combination effect and its specificity of the body to infection SGIV GS cells
The hatching combination process of the processing of cell, cell and aptamer is as noted above, the detection of flow cytometry
As a result as shown in Fig. 2 as a result, it was confirmed that the aptamer of sequence 1 have to target cell infection SGIV GS cells it is stronger
Specific recognition capability.
10th, fluorescence microscope detects the nucleic acid adaptation of four carboxyl tetramethylrhodamine (TAMRA) marks in the present embodiment
The combination effect and its specificity of body and infection SGIV GS cells
Continue to cultivate 48h after cultivating GS cells, access SGIV on cover glass in six orifice plates, obtain infection SGIV GS
Cell, cultivates normal GS cells as control on another cover glass, removes culture medium, cell is washed with 10mL PBS.
Add the 1mL binding buffer containing the aptamer in the above-mentioned the present embodiment of 300nM, ice bath combination 30min.Instead
After should terminating, supernatant is removed, with 10mL PBSs three times, after slightly drying, cover glass is placed on slide and quenched with anti-fluorescence
Go out agent mounting, observation.As shown in figure 3, the aptamer of sequence 1 has specific binding energy to the GS cells for infecting SGIV
Power, and ability is almost not bound with to normal GS cells, the result is consistent with the testing result of flow cytometer.
11st, the specific binding of grouper liver organization of the aptamer to being infected by irido virus is tested
The aptamer of sequence 1 marked with carboxyl tetramethylrhodamine (TAMRA), the grouper liver to infecting SGIV
Tissue freezing section carries out specific binding detection, by the combination of aptamer and normal grouper liver organization frozen section
As a result as control.Frozen section is washed 3 times with 100mL PBS first, section is contained into 300nM TAMRA marks with 200 μ l
The binding buffer incubations at room temperature of the aptamer of note combine 60min, and then tissue is placed on shaking table and uses 100mL
PBS is washed, and the dyeing for compareing normal structure is identical with washing methods.After tissue is slightly dried, with anti-fluorescence quenching mounting,
Fluorescence microscopy Microscopic observation.As shown in figure 4, grouper liver organization of the aptamer to infecting SGIV shown in sequence 1
With stronger specific binding capacity, and ability is almost not bound with to normal grouper liver organization.This and infection SGIV
Lithosporic fry cell fluorescence microscope result it is consistent with flow cytomery result.
Claims (3)
1. a kind of DNA aptamers for being used to detect grouper irido virus infection, its nucleotide sequence such as SEQ ID NO：1
It is shown, the mark for detection is combined with described nucleotide sequence.
2. the DNA aptamers according to claim 1 for being used to detect grouper irido virus infection, its feature exists
In the described mark for being used to detect is tetramethylrhodamine, biotin, digoxin, fluorescent material, nano luminescent material
Material, polyethylene glycol, peptide fragment, albumen, folic acid or enzyme mark.
3. a kind of kit for being used to detect grouper irido virus infection, it is characterised in that containing described in claim 1
DNA aptamers.
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| CN105785024A (en) * | 2016-04-22 | 2016-07-20 | 中国科学院南海海洋研究所 | Aptamer-based enzyme-linked immunosorbent assay method for detecting iridovirus infection of groupers |
| CN106916821B (en) * | 2017-04-11 | 2020-12-22 | 中国科学院南海海洋研究所 | ssDNA nucleic acid aptamer and application thereof |
| CN109161546B (en) * | 2018-09-20 | 2021-11-09 | 广西科学院 | Aptamer and application thereof in detection of trachinotus ovatus source pathogenic vibrio alginolyticus |
| CN110257387B (en) * | 2019-07-04 | 2022-10-28 | 广西科学院 | Aptamer for identifying grass carp hemorrhagic disease virus as well as construction method and application thereof |
| CN111118014B (en) * | 2019-10-30 | 2022-12-20 | 广西科学院 | Anti-iridovirus aptamer and construction method and application thereof |
| CN110643611B (en) * | 2019-10-30 | 2022-10-28 | 广西科学院 | Aptamer, construction method thereof and application thereof in detection of grouper iridovirus |
| CN111073891B (en) * | 2019-10-30 | 2022-10-28 | 广西科学院 | Aptamer for detecting grouper iridovirus as well as construction method and application thereof |
| CN111363749B (en) * | 2020-02-07 | 2022-12-20 | 广西科学院 | Nucleic acid aptamer for detecting Chinese softshell turtle iridovirus as well as construction method and application thereof |
| CN113278621B (en) * | 2021-05-14 | 2022-10-28 | 广西科学院 | ssDNA aptamer and application thereof in identification and detection of vibrio harveyi |
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