CN105950730A

CN105950730A - MiRNA biomarker and detection kit for thyroid cancer diagnosis

Info

Publication number: CN105950730A
Application number: CN201610339115.2A
Authority: CN
Inventors: 崔学俊
Original assignee: Individual
Current assignee: Individual
Priority date: 2016-05-21
Filing date: 2016-05-21
Publication date: 2016-09-21

Abstract

The invention discloses an miRNA biomarker and a detection kit for thyroid cancer diagnosis. The miRNA biomarker comprises microRNAs, namely hsa-miR-193b-3p, hsa-miR-384, hsa-miR-145-5p, hsa-miR-424-5p and hsa-miR-143-3p. The five miRNAs, namely the hsa-miR-193b-3p, the hsa-miR-384, the hsa-miR-424-5p, the hsa-miR-145-5p and the hsa-miR-143-3p, in which expression differences between the thyroid cancer and para-carcinoma tissues are obvious (difference expression amount is larger than 2 folds, and the CT value in RT-PCR is smaller than 30), are subjected to serologic expression analysis; results show that the five miRNAs are expressed stably in serum, expression and organization of serum miRNAs have high uniformity, expression of the hsa-miR-193b-3p, the hsa-miR-384 and the hsa-miR-145-5p is regulated down, and expression of the hsa-miR-424-5p and the hsa-miR-143-3p is regulated up. The five microRNAs can serve as the miRNA biomarker for thyroid cancer diagnosis, and sensitivity and specificity of combined diagnosis are higher than those of single miRNA diagnosis remarkably.

Description

MiRNA biomarker and detection kit for diagnosis of thyroid cancer

Technical field

The present invention relates to biological detection, relate to microRNA biomarker and the detection examination of human thyroid carcinomas diagnosis Agent box.

Background technology

Thyroid carcinoma is common endocrine gland malignant tumor, accounts for the 2.59% of cancer morbidity, including thyroid nipple Shape cancer (PTC), thyroid follcular carcinoma (FTC), anaplastic thyroid carcinoma (ATC) and medullary thyroid carcinoma (MTC), former three originates from In follicular epithelial cells, the latter originates from parafollicular cell, and wherein PTC accounts for the 80% of thyroid carcinoma.At present, thyroid carcinoma Pathogenesis is the clearest, by the thyroid carcinoma cause of disease and the research of generation development mechanism, for improving its diagnosis, guidance Treat and improve prognosis and there is important clinical meaning.

MicroRNA (miRNA) is the non-coding microRNA being about 18-25 nucleotide of latest find, is evolving Upper high conservative, quantity accounts for the 1% of genome, has generally believed that miRNA and human diseases have close contacting, It is found to be people and provides new approaches in gene level understanding cancer.MiRNA is transcribing or post-transcriptional level negative regulation albumen The expression of matter encoding gene: be combined by or approximation complete complementary non-fully complementary with its target gene mRNA, cause mRNA to degrade Or suppress it to translate.The gene of human genome about 30% is regulated and controled by miRNA, cell growth, breed, break up and apoptosis etc. Many-side plays important biological regulation effect.Research has proven to the Abnormal regulation of miRNA and is formed and evolving relations with tumor Closely.The target gene majority of MiRNA be participate in transcribing, signal transduction, the gene of the biological effect such as tumor generation.Along with MiRNA and the research that deepens continuously of cancer, find that miRNA is not only the initial stage that take part in formation of cancer, also relate to And to disease condition change, to the sensitivity of medicine, patient's prognosis etc. many-side.The cancer gene being subsequently based on miRNA is controlled Treatment is taken advantage of a situation and is climbed up stage, highlights the biggest researching value.

The microRNA biomarker research being presently used for human thyroid carcinomas diagnosis is less, there is no reliably MicroRNA biomarker is used for diagnosing human thyroid carcinomas.

Summary of the invention

It is an object of the invention to provide the microRNA biomarker for diagnosis of thyroid cancer and detection kit.

The above-mentioned purpose of the present invention is achieved by techniques below scheme:

The microRNA biomarker diagnosed for human thyroid carcinomas, including: hsa-miR-193b-3p, hsa-miR- 384, hsa-miR-145-5p, hsa-miR-424-5p and hsa-miR-143-3p；The nucleotide of described hsa-miR-193b-3p Sequence is as shown in SEQ ID NO.1；The nucleotide sequence of described hsa-miR-384 is as shown in SEQ ID NO.2；Described hsa- The nucleotide sequence of miR-145-5p is as shown in SEQ ID NO.3；The nucleotide sequence of described hsa-miR-424-5p such as SEQ Shown in ID NO.4；The nucleotide sequence of described hsa-miR-143-3p is as shown in SEQ ID NO.5.

Further, described microRNA biomarker is human serum microRNA biomarker.

Lineup's diagnosis of thyroid cancer microRNA primer, the combination of probe, including hsa-miR-193b-3p primer, Probe, hsa-miR-384 primer, probe, hsa-miR-145-5p primer, probe, hsa-miR-424-5p primer, probe, Hsa-miR-143-3p primer, probe；Described primer includes before reverse transcription primer, quantitative PCR primer after primer and quantitative PCR； The reverse transcription primer sequence of hsa-miR-193b-3p as shown in SEQ ID NO.6, primer sequence such as SEQ ID before quantitative PCR Shown in NO.7, after quantitative PCR, primer sequence is as shown in SEQ ID NO.16；The reverse transcription primer sequence such as SEQ of hsa-miR-384 Shown in ID NO.8, before quantitative PCR, primer sequence is as shown in SEQ ID NO.9, primer sequence such as SEQ ID after quantitative PCR Shown in NO.16；The reverse transcription primer sequence of hsa-miR-145-5p as shown in SEQ ID NO.10, primer sequence before quantitative PCR As shown in SEQ ID NO.11, after quantitative PCR, primer sequence is as shown in SEQ ID NO.16；The reverse transcription of hsa-miR-424-5p Primer sequence is as shown in SEQ ID NO.12, and before quantitative PCR, primer sequence is as shown in SEQ ID NO.13, primer after quantitative PCR Sequence is as shown in SEQ ID NO.16；The reverse transcription primer sequence of hsa-miR-143-3p is as shown in SEQ ID NO.14, quantitatively Before PCR, primer sequence is as shown in SEQ ID NO.15, and after quantitative PCR, primer sequence is as shown in SEQ ID NO.16；Respectively The nucleotide sequence of microRNA probe is as shown in SEQ ID NO.17.

The tumor diagnosis kit of a kind of human thyroid carcinomas, including microRNA primer as above, the combination of probe.

Further, the tumor diagnosis kit of described human thyroid carcinomas also include reverse transcriptase, buffer, dNTPs, MgCl2, DEPC water, Taq enzyme and standard substance and/or reference substance.

Advantages of the present invention:

By cancer beside organism's differential expression of human thyroid carcinoma with pairing, substantially (differential expression amount is more than 2 to the present invention In fold, RT-PCR CT value be less than 30) 5 kinds of miRNAhsa-miR-193b-3p, hsa-miR-384, hsa-miR-424-5p, Hsa-miR-145-5p and hsa-miR-143-3p carries out serology expression analysis, and result shows that these 5 kinds of miRNA are steady in serum Fixed expressing, the expression of serum miRNA and tissue have a good concordance, hsa-miR-193b-3p, hsa-miR-384 and Hsa-miR-145-5p down-regulated expression, hsa-miR-424-5p and hsa-miR-143-3p up-regulated.These 5 kinds of miRNA are permissible As the biomarker of diagnosis of thyroid cancer, and the sensitivity of Combining diagnosis is significantly higher than single miRNA diagnosis with specificity Sensitivity and specificity.

Detailed description of the invention

Further illustrate the essentiality content of the present invention below in conjunction with embodiment, but do not limit the present invention with this and protect model Enclose.Although the present invention being explained in detail with reference to preferred embodiment, it will be understood by those within the art that, can be right Technical scheme is modified or equivalent, without deviating from the spirit and scope of technical solution of the present invention.Implement The experimental technique of unreceipted actual conditions in example, generally according to normal condition, such as the bar described in textbook and experiment guide Part, or according to the condition proposed by manufacturer.

Embodiment 1: the screening of human thyroid carcinoma diversity miRNA

1 object and method

1.1 Specimen origin

After obtaining patient's informed consent, collect Jiangsu Prov. People's Hospital in May, 2013 in JIUYUE ,-2014 through proved by pathology For thyroid cancer patients Post operation specimen 8 right, including 3 centimetres of range above of distance cancerous tissue of cancerous tissue specimen and pairing Cancer beside organism, all patients the most all do not receive chemotherapy and radiotherapy.

1.2 key instrument equipment

Desk centrifuge: EppendorfMini spin (U.S.) Eppendorfcentrifuge 5810R (U.S.)

Nucleic acid condensation instrument: Eppendorfconcentrator 5301 (U.S.)

Ultraviolet spectrophotometer: DU640, balance (Beckman Products)

UV-crosslinked instrument: GS GENE LINKER UV Chamber (BIO-RAD Products)

Water-bath (Memert Products)

Hybridizing box, chip, chip scanner: LuxScan-10K/A (Capitalbio Products)

Horizontal shaker: TDK-2 (the sensible Science and Technology Ltd. in Beijing)；Gel image analyser: GDS-7600 (UPV product)

Superclean bench (Memert Products)；Real-time fluorescence PCR instrument: ABI PRISM7500 (U.S.)

1.3 major experimental reagent

Trizol, glycogen (Invitrogen company)；T4RNA ligase (NEB company)；Control RNA (Capitalbio company)；5P '-C-U-Cy3-3 ' 5P '-C-U-Cy5-3 ' (Dharmacon company)；Ambion’s miRNA Isolation Kit (Ambion company)；EDPC, first phthalein amine, Australia's phenol are blue (Sigma company)；20 × SSC, 10%SDS (PIERCE company)；50 × Dhardt ' s (ancient cooking vessel state)；MOPS (Bocherigmer company)；5 × RT Buffer (the U.S. Promega company), M-MLV reverse transcriptase: 200u/ μ l (Promega company of the U.S.)；(Shanghai is raw for 4 × dNTP:10mM each Work biological engineering company limited)；RNase inhibitors 4 0u/ μ l (Dalian treasured biological engineering company limited).

The extraction of 1.4 tissue specimen total serum IgE

Trizol one-step method extracts the total serum IgE in tissue specimen.Specifically comprise the following steps that

(1) equipment and the reagent such as mortar, even poly-device, spoon, shears, tweezers, liquid nitrogen are prepared；

(2) mortar pre-cooling: repeatedly add liquid nitrogen in mortar, at least 4-5 time, make the abundant pre-cooling of mortar；

(3) wear gloves, mask, takes out sample with tweezers from liquid nitrogen container rapidly, weighs in analytical balance, once carry The piece of tissue weight taken is between 0.3-0.5g.Piece of tissue is put into and is ground with in the mortar of Liquid nitrogen precooler, and grinding limit, limit adds Liquid nitrogen, whole process does not the most make piece of tissue melt.

(4) after rough lapping, in superclean bench, rapidly the tissue ground is moved into equipped with Trizol reagent with little spoon Hooking in dress device, add 1ml Trizol by 100mg tissue, homogenate is to the tissue samples granule that is invisible to the naked eye.

(5) transferring in 1.5ml centrifuge tube with dropper by homogenate, often pipe is put into about, more than room temperature placement, preserve extremely- Until analyzing in 80 DEG C of refrigerators.

(6) homogenate specimen normal temperature unfreezing, in 0.2ml chloroform/1ml Trizol ratio add chloroform, vortex 30 seconds, Room temperature places 3min, and then 4 DEG C, 12000rpm is centrifuged 15min.

(7) centrifugal rear solution layering, is divided into bottom phenol-chloroform, intermediate layer and upper strata aqueous phase.RNA only exists in aqueous phase, uses Supernatant is transferred to, in the 1.5ml centrifuge tube that another is new, not draw intermediate layer by sample injector.By 0.5ml isopropanol/1ml The ratio of Trizol adds isopropanol, mixing, and room temperature places 4 DEG C of centrifugal 15min of more than 10min, 12000rpm.

(8) supernatant discarded, isopropanol does not reflux too much, can be the ofest short duration centrifugal, is inhaled by remaining isopropanol with sample injector Go out, add 1ml 75% ethanol, 4 DEG C of centrifugal 5min of vortex, 7500rpm.

(9) discarding 75% ethanol, natural drying 30min in fume hood, traditional vacuum is not dried, and RNA is the most completely dry Thoroughly, in case can not be completely dissolved, with DEPC water dissolution RNA, often pipe is dissolved in 30 μ l, 60-65 DEG C of hydrotropy 5min.

(10) RNA is quantitative, draws the RNA sample of 1 μ l, adds in 49 μ l DEPC water, blow and beat mixing with sample injector up and down, Dilute 50 times.Blank by the DEPC water gauge note dissolving RNA, draw 50 μ l and add in cuvettes.Use ultraviolet spectrophotometer DU- 640 measure OD value, ratio calculated OD260/OD280 ratio and RNA concentration.

RNA concentration=OD260 × 40 μ g/ml × extension rate.

The separation and Extraction of miRNA in 1.5 total serum IgE

Take 50-100 μ g total serum IgE Ambion ' s miRNAIsolation Kit and separate miRNA, specifically comprise the following steps that

(1) take 50-100 μ g total serum IgE and add EP pipe, be settled to appropriate volume.Add the Lysis/Binding of 5 times of volumes Buffer, mixing.

(2) add ten/the miRNAHomogenate Additive of a volume, vibration mixing, it is placed in and hatches 10 points on ice Clock.

(3) add three/100% ethanol of a volume, the most mixed hook.

(4) being added in chimney filter by above-mentioned mixed liquor, 5000rpm is centrifuged 1 minute, collects filtrate (tiny RNA is in filtrate).

(5) in filtrate, add 100% ethanol of 2/3rds volumes, fully mix.

(6) changing chimney filter, filtered by the mixture of step (5), 5000rpm is centrifuged 1 minute, discards filtrate, collects Pipe is continuing with.

(7) chimney filter is placed in collecting pipe, with the miRNAwashing solution 1 filter wash pipe of 700 μ l, 5000rpm Centrifugal 1 minute, discard filtrate.

(8) with the miRNAwashing solution 2 filter wash pipe of 500 μ l, 5000rpm is centrifuged 1 minute, discards filtrate； One time is washed again with miRNAwashing solution 2；Chimney filter is centrifuged 1 minute together with collecting pipe 10000rpm, removes chimney filter The liquid of middle residual.

(9) elution solution is heated to 95 DEG C；Change a new collecting pipe, by 50 μ l's 95 DEG C Elution solution adds filter, close the cover, incubated at room 2 minutes；10000rpm is centrifuged 1 minute, collects filtrate, little RNA is in filtrate.Repeat step (9).

1.6miRNA cDNA microarray

1.6.1miRNA chip

Mammal miRNA chip V3.0 for people 677, rat 292,461 ripe microRNA of mice, due to people, The miRNA three of rat and mice has common sequence, takes the union of three, devises altogether 924 probe (sanger MiRNA data base: mi RNABase10.0).These probes chip point sample instrument Smart-Array TM (Capitalbio Corp, Beijing, China) put and make at a 75 × 25mm, on the microscope slide of chemical modification.Point system sample on chip Product also include that U6, tRNA of people are as internal standard；30 probes corresponding for bases longs RNA of 8 artificial preparations are as chip External standard (Zip5, Zip13, Zip15, Zip21, Zip23, Zip25, Y2, Y3), Hex as point sample positive control, 50%DMSO As hybridization negative control.

1.6.2miRNA the fluorescent labeling of sample

Specifically comprise the following steps that

(1) fluorescent labeling of miRNA: take 2-5 μ g cancerous tissue miRNA through polyethylene glycol precipitation, with 0.1mgATP, 50mM HEPES、3.5m M DDT、20mM MgCl₂, the 5P '-C-U-Cy3-of 10mg/ml BSA, 10%DMSO, 500ng Cy3 labelling 3 ' (from Dharmacon companies) and the T4RNA ligase of 20 units, blow and beat with rifle head, mix gently.Tinfoil parcel sample Pipe, reacts 2 hours at 0 DEG C of labelling.In like manner with Cy5 labelling cancer beside organism miRNA.MiRNA mixing after two kinds of labellings.

(2) purification of miRNA: add DEPC water, polishing to 100 μ l in the sample after above-mentioned fluorescent labeling, add ten 3mmol/L sodium acetate (pH5.2) the 10 μ l of/mono--20 DEG C of pre-coolings of volume, glycogen 10 μ g, 2.5 times of volume dehydrated alcohol, in- 20 DEG C stand 1 hour.

(3) rinsing of miRNA precipitation: supernatant discarded, adds 75% ethanol 800 μ l of-20 DEG C of pre-coolings, fully after mixing 4 At DEG C, 12000rpm is centrifuged 5 minutes.It is repeated 2 times.Supernatant discarded, is dried 10min, in atmosphere for chip hybridization after drying up.

1.6.3miRNA chip hybridization

Specifically comprise the following steps that

(1) RNA is dissolved in (15% Methanamide 2.4 μ l in 16 μ l hybridization solutions；0.2%SDS 3.2 μ l；3×SSC 2.4μl； 50 × Denhardt ' s 1.6 μ l, DEPC process water 6.4 μ l).

(2) constant-temperature metal bath is heated, and dissolves, vibration, mixing.

(3) take out, place in-20 DEG C of refrigerators 10 minutes, be allowed to lower the temperature.

(4) 95 DEG C of deformation 3min.

(5) cool down the most rapidly, be all added drop-wise on mammal microRNA chip V3.0, add a cover silication coverslip.

(6) keep humidity through the filter paper that distilled water is moistening after sterilization in hybridizing box, 42 DEG C of hybridized overnight, usual 16 hours with On.

(7) after hybridization terminates, first rinsing 4 minutes in about the 42 DEG C liquid shaking tables containing 0.2%SDS, 2 × SSC, then Containing room temperature in 0.2 × SSC liquid shaking table at room temperature and wash 4 minutes, slide is placed in pipe, and 1600rpm is centrifuged 1 minute after drying I.e. can be used for scanning.

1.6.4 core body scanner uni data process

Chip Luxscan 10K/A twin-channel laser scanner (Capitalbio company) is scanned.Data are extracted Luxscan 3.0 image analysis software (Capitalbio company) is used to chip image analysis, picture signal to be converted into number Word signal.

1.7miRNA chip results real time RT-PCR verifies

1.7.1miRNAreal time RT-PCR primer designs

Special about 56 nucleotide of stem ring primer (reverse transcription primer sequence), its 5 ' 48 nucleotide sequences held are solid Fixed, forming the structure of a stem ring, its 3 ' 8 nucleotide held are just complementary with microRNA.Forward primer (primer before PCR) It is about 30-31 nucleotide, has about 16-17 nucleotide complementary with corresponding microRNA at 3 ' ends, and remain 14 nucleoside The Tm value of acid is higher than 65 degrees Celsius.General reverse primer (primer after PCR) is about 23nt, and wherein 18 nucleotide correspondences are special The loop-stem structure of reverse primer, and the Tm value of 5 ' hold 5 nucleotide is higher than 65 degrees Celsius.

1.7.2miRNAreal time RT-PCR

1.7.2.1cDNA reverse transcription synthesis

Tissue specimen total serum IgE reverse transcription synthesis cDNA, reaction system is as follows:

Component	Volume (unit: μ l)
		Total serum IgE template	1 μ g (calculates volume according to concentration)
Stem-loop RT primer(500nM)	1
		5×RT Buffer	2
100mM DTT	1
		dNTPs(10mMeach)	0.5
RNase inhibitor (40U/ μ l)	0.1
		M-MLV(200U/μl)	1
Add DEPC water	To 10 μ l

Reaction condition: 16 DEG C, 30min；42 DEG C, 60min；85 DEG C, 5min；4 DEG C, hold.

1.7.2.1miRNAreal time RT-PCR reacts

MiRNA real time RT-PCR reaction system is as follows:

Component	Volume (unit: μ l)
		SYBR^R Premix Ex Taq^TM(2×)	12.5
Forward primer 10 μMs	0.5
		Reversely universal primer μM	0.5
ROX Reference Dye Ⅱ(50×)	0.5
		DNA profiling (dilutes 10 times)	2
DEPC processes water	To 25

Reaction condition: 95 DEG C of denaturations 10min；95℃5s、60℃34s×40.

1.8 statistical analysis

The result of gene chip screening uses Cluster 3.0 and Significance Analysis ofMicroarrys (SAM, version2.1) is analyzed.Data with (± represent, compare between group employing inspection, use software be analyzed process, Statistically significant for difference.Real time RT-PCR data represent with (x ± s), compare employing t inspection, use between group SPSS 17.0 software is analyzed processing, and P ＜ 0.05 is that difference is statistically significant.

2 results

2.1miRNA gene chip the selection result

Utilize miRNA chip that 924 kinds of miRNA expressions in the cancer beside organism of 8 pairs of human thyroid carcinomas and pairing are entered Row is analyzed, and filters out miRNA, wherein hsa-miR-424-5p, hsa-miR-497, hsa-miR-that 20 species diversity are expressed altogether 143-3p up-regulated, hsa-miR-381, hsa-miR-145-5p, hsa-miR-199b-5p, hsa-miR-384, hsa- miR-335、hsa-miR-99a、hsa-miR-193b-3p、hsa-miR-125b、has-let-7b、hsa-miR-10a、hsa- miR-126、hsa-miR-30a、hsa-miR-141、hsa-miR-125a-5p、hsa-miR-19b、hsa-miR-26a、rno- MiR-324-3p down-regulated expression.

The real time RT-PCR checking of 2.2miRNA gene chip the selection result

With miRNA real time RT-PCR, the result of chip examination is verified, filter out 9 species diversity tables altogether The miRNA reached, wherein, hsa-miR-424-5p, hsa-miR-143-3p and hsa-miR-497 up-regulated, hsa-miR- 384, under hsa-miR-145-5p, hsa-miR-381, hsa-miR-497, hsa-miR-99a, hsa-miR-193b-3p express Adjust.5 kind miRNAs, hsa-miR-193b-3p obvious to wherein different expression, hsa-miR-384, hsa-miR-424-5p, Hsa-miR-145-5p and hsa-miR-143-3p carries out further serology expression analysis.

Embodiment 2: the serological analysis of diversity miRNA in human thyroid carcinoma

1 object and method

1.1 Specimen origin

Obtaining after patient's informed consent, collecting Jiangsu Prov. People's Hospital in May, 2013 to example July 165 in 2014 through disease Reason diagnoses clear and definite thyroid cancer patients and 120 example Healthy People limosis vein blood in early morning 6ml as comparison.All thyroid carcinomas are suffered from Person is first patient diagnosed, does not carries out performing the operation, radiotherapy and chemotherapeutic treatment before taking blood.120 example normal healthy controls groups are not for suffering from Malignant tumor and other diseases, the simultaneously healthy population of age-matched.

1.2 serum sample collection and process

Extraction early morning limosis vein blood 6ml be placed in without in the pipe of anticoagulant, stand 30 minutes, in 4 DEG C of 1300g (or 4000rpm) centrifugal 15 minutes, take the every 300 μ l subpackages of upper serum and be placed in-80 DEG C of refrigerator storage to RNase-free EP pipe.

1.3 key instrument equipment

Eppendorfcentrifuge (U.S.)；Horizontal laminar flow clean bench (memert company)；Uv-spectrophotometric Meter nano (Thermo science and technology)；Water-bath (memert company)；Real-time PCR instrument CFX96 (Germany BIO-RAD)；Vortex Whirlpool concussion instrument (U.S. SI)；Ultra cold storage freezer (Thermo science and technology)；Milli Q demineralizer (Synthesis company).

1.4 major experimental reagent

Blood total serum IgE rapid extraction test kit (Beijing hundred Imtech)；Lysate RLS；Protein liquid removal RE；Rinsing liquid RW；RNase-free H₂O；70% ethanol；RNase-free adsorptivity RA；The synthesis examination of miRcute miRNA cDNA the first chain Agent box (TIANGEN)；E.coli Poly(A)Polymerase(5U/ml)；10×Poly(A)Polymerase Buffer；5 ×rATP Solution；10×RT Prime；10×RT Buffer；Super Pure dNTP Mixture；Rnasin； Quant RTase；RNase–Free ddH₂O；MiRcute miRNA fluorescence quantitative detection kit (TIANGEN)；2× miRNA premix(SYBRROX)；Reverse primer；50×ROXReference Dye；(Sigma is public for Chloroform Department).

1.5 design of primers

1.6 experimental technique

1.6.1 serum sample Total RNAs extraction

(1) every 250 μ l serum add 750 μ l lysate RLS, with sample loading gun piping and druming sample several times, and lysate RLS and liquid The final volume of sample is than always 3:1.

(2) sample acutely shaking mixing, incubated at room temperature 5 minutes is so that ribosome decomposes completely.

Under the conditions of (3) 4 DEG C, 12000rpm is centrifuged 10 minutes, carefully takes supernatant and proceeds to the centrifuge tube of new RNase free In.

(4) every milliliter of RLS adds 0.2ml chloroform, covers tightly sample lid, and acutely concussion 15 seconds ambient temperatare put 3 minutes.

(5) being centrifuged 10 minutes in 4 DEG C of 12000rpm, sample can be divided into three layers: lower floor's organic facies, intermediate layer and upper strata are colourless Aqueous phase, RNA is present in aqueous phase.The capacity of aqueous layer is about the 70% of added RLS volume, and aqueous phase is transferred to newly manage In, carry out next step operation.

(6) 1 times of volume 70% ethanol is added, reverse mixing (now it is possible that precipitate).The solution obtained and possibility Precipitation proceeds to (adsorption column is enclosed within collecting pipe) in RA post together.

(7) 10000rpm is centrifuged 45 seconds, discards waste liquid, and adsorption column is recovered collecting pipe again.

(8) adding 500 μ l protein liquid removal RE, 12000rpm is centrifuged 45 seconds, discards waste liquid.

(9) adding 700 μ l rinsing liquid RW, 12000rpm is centrifuged 60 seconds, discards waste liquid.

(10) adding 700 μ l rinsing liquid RW, 12000rpm is centrifuged 60 seconds, discards waste liquid.

(11) putting back in sky collecting pipe by adsorption column RA, 12000rpm is centrifuged 2 minutes, removes rinsing liquid as far as possible, in order to avoid drift Residual ethanol suppression downstream reaction in washing liquid.

(12) take out adsorption column RA, put in a RNase free centrifuge tube, add 30 μ l in the middle part of adsorbed film The RNase free water of heating in 65 DEG C of water-baths in advance, room temperature placement 2 minutes, 12000rpm is centrifuged 1 minute, will obtain Solution rejoin in centrifugal adsorbing column, centrifugal 1 minute.

1.6.2cDNA transcribe

After blood serum sample Total RNAs extraction, use and add poly A tract Poly (A) at miRNA 3 ' end, re-use oligo (dT) the general reverse transcriptase primer of-universal tag carries out reverse transcription reaction, ultimately generates cDNA the first chain corresponding for miRNA.

1.6.2.1miRNA 3 ' ends carry out Poly (A) process

(1) add following reagent in the reaction tube of pre-cooling RNase free on ice (to be eventually adding to cumulative volume 20 μ l E.coli Poly(A)Polymerase)。

Component	Volume (μ l)	Final concentration
			Total serum IgE		Up to 2 μ g
E.coli Poly(A)Polymerase	0.4	2U
			10×Poly(A)Polymerase Buffer	2	1×
10×rATP solution	4	1×
			RNase free ddH₂O	-	-
Cumulative volume	20	-

(2) pipettor mixes the reactant liquor of above-mentioned preparation gently, of short duration centrifugal after react 60 minutes at 37 DEG C, continue real Test.

1.6.2.2Poly the miRNA that (A) modifies carries out reverse transcription reaction, carries out the preparation of reactant liquor according to following table component.

Component	Volume (μ l)
		Poly (A) reactant liquor	2
10×stem-loop RT Prime	2
		10×RT Buffer	2
Super Pure dNTP Mixture	1
		Rnasin	1
Quant RTase	0.5
		RNase-Free ddH₂O	11.5
Cumulative volume	20

1.6.3real time RT-PCR

(1) room temperature melts 2 × miRNA premix (SYBR) and Reverse primer.

(2) 2 × miRNA premix (SYBR) is turned upside down mix gently, it is to avoid bubble, then after light gentle centrifugation Re-use.

(3) reagent is placed on ice, and prepares reaction volume according to following table.

Component	50 μ l systems	Final concentration
			2×miRNA premix(SYBR)	25	1×
Forward primer	-	200nM
			Reverse primer	1	200nM
MiRNA the first chain cDNA	-	-
			ddH₂O	To 50 μ l	-

PCR response procedures is arranged according to following table

Circulation	Temperature (DEG C)	Time	Content
				1×	94	2min	Starting template degeneration
40-45×	94	20s	Template denaturation in PCR cycle
					60	34s	Annealing, extension

1.6.4PCR data process

PCR amplification CT value represents, CT value is meant that in PCR reactant liquor that fluorescence signal reaches set threshold Period during value.The relative expression of sample genes of interest leads (RQ) and uses △ △ CT method to calculate,(CT represents The real-time fluorescence intensity of reaction is noticeably greater than period during background value, △ CT sample=CT sample CT U6sample, △ CT control=CT control CT U6control, △ △ CT=△ CT sample-△ CT control)。

1.7 statistical analysis

Using SPSS 17.0 statistical software to carry out data process, measurement data represents with (x ± s), compares employing t between group Inspection, the relation of serum miRNA relative expression quantity and thyroid carcinoma clinical pathologic characteristic use Mann Whiney inspection and Kruskal Wallis checks.P ＜ 0.05 is that difference is statistically significant.

2 results

The real time RT-PCR detection of 2.1 serum targets miRNA

Target miRNA expression in 165 example thyroid cancer patients and 120 example normal healthy controls group serum is carried out by this research Quantitative analysis, with U6 as internal standard, result shows that miRNA is stable in serum and expresses, reliable and stable as internal reference with U6.

Target miRNA expression in 2.2 thyroid cancer patients and matched group serum

Matched group and thyroid carcinoma group hsa-miR-384, hsa-miR-424-5p, hsa-miR-145-5p, hsa-miR- 143-3p and hsa-miR-193b-3p relative expression quantity compares, difference the most statistically significant (P ＜ 0.05).

Data see table.

Group	hsa-miR-143-3p	hsa-miR-384	hsa-miR-424-5p	hsa-miR-145-5p	hsa-miR-193b-3p
						Matched group	1.13±0.22	1.12±0.29	1.05±0.26	0.98±0.12	0.94±0.17
Thyroid carcinoma group	2.86±0.25	0.58±0.32	2.88±0.23	0.52±0.14	0.46±0.21
						T value	2.552	2.694	2.548	2.371	2.395
P value	0.011	0.012	0.01	0.010	0.011

The present invention utilizes miRNA chip to carry out miRNA express spectra in the cancer beside organism of 8 pairs of human thyroid carcinomas and pairing Analyzing, filter out the miRNA that 20 species diversity are expressed altogether, chip results is verified by real-time fluorescence quantitative RT-PCR, Filter out the miRNA that 9 species diversity are expressed, wherein hsa-miR-424-5p, hsa-miR-143-3p and hsa-miR-497 table altogether Reach rise, hsa-miR-384, hsa-miR-145-5p, hsa-miR-381, hsa-miR-497, hsa-miR-99a, hsa- MiR-193b-3p down-regulated expression.Tumor is the result that a series of molecular biology behavior change is accumulative, relates to cell The various aspects such as cycle, apoptosis, proliferation and differentiation, the change that a series of miRNA therefore should be had to express participates in sending out of tumor Raw, the result verification of gene chip this it is assumed that the expression of multiple miRNA there occurs change.

5 kinds of miRNA, hsa-of differential expression substantially (differential expression amount is more than 2 fold, and in RT-PCR, CT value is less than 30) MiR-193b-3p, hsa-miR-384, hsa-miR-424-5p, hsa-miR-145-5p and hsa-miR-143-3p are carried out into one The serology expression analysis of step.Result shows that miRNA is stable in serum and expresses, and the expression of serum miRNA and tissue have very Good concordance, hsa-miR-193b-3p, hsa-miR-384 and hsa-miR-145-5p down-regulated expression, hsa-miR-424-5p With hsa-miR-143-3p up-regulated.Result shows, these 5 kinds of miRNA can be as the biomarker of diagnosis of thyroid cancer.

Embodiment 3: Receiver operating curve (ROC) analyzes

Build ROC curve and compare 5 serum miRNA differentiation thyroid carcinoma patients and the diagnosis capability of normal healthy controls.5 MiRNAROC area under curve (AUC) is respectively as follows: hsa-miR-193b-3p, 0.802 (95% confidence interval: 0.760- 0.920)；Hsa-miR-384,0.809 (95% confidence interval: 0.736-0.902)；Hsa-miR-145-5p, 0.804 (95% Confidence interval: 0.734-0.894)；Hsa-miR-424-5p, 0.803 (95% confidence interval: 0.765-0.920)；hsa-miR- 143-3p, 0.734 (95% confidence interval: 0.644-0.832).Under optimal cut off value, the sensitivity of miRNA and spy The opposite sex is as follows: hsa-miR-193b-3p, respectively 83.3% and 82.7%；Hsa-miR-384, respectively 64.8% He 94.2%；Hsa-miR-145-5p, respectively 90.7% and 61.5%；Hsa-miR-424-5p, respectively 70.4% He 82.5%；Hsa-miR-143-3p, respectively 67.3% and 74.1%.The AUC that these 5 miRNA join together can reach 0.985, sensitivity and specificity are respectively 93.1% and 93.7%, hence it is evident that be better than single miRNA.This result shows, hsa- MiR-193b-3p, hsa-miR-384, hsa-miR-145-5p, hsa-miR-424-5p and hsa-miR-143-3p join together Thyroid carcinoma detection had the highest sensitivity and specificity.

Embodiment 4: human thyroid carcinomas diagnosis test kit

Above-described embodiment shows, hsa-miR-193b-3p, hsa-miR-384, hsa-miR-145-5p, hsa-miR- 424-5p and hsa-miR-143-3p joins together to detect thyroid carcinoma have the highest sensitivity and specificity, therefore, Can be based on hsa-miR-193b-3p, hsa-miR-384, hsa-miR-145-5p, hsa-miR-424-5p and hsa-miR-143- 3p makes the test kit for human thyroid carcinomas diagnosis.This test kit includes hsa-miR-193b-3p primer, probe；hsa- MiR-384 primer, probe；Hsa-miR-145-5p primer, probe；Hsa-miR-424-5p primer, probe；hsa-miR-143- 3p primer, probe.Primer specifically includes before reverse transcription primer, quantitative PCR primer after primer and quantitative PCR.Certainly, this test kit In also should include reverse transcriptase, buffer, dNTPs, MgCl₂, DEPC water, Taq enzyme and standard substance and/or reference substance.Under Table is a kind of design of primer and probe.

The design of primer and probe is this area routine techniques means, can be designed to other sequences.

The effect of above-described embodiment indicates that the essentiality content of the present invention, but does not limit the protection of the present invention with this Scope.Technical scheme can be modified or equivalent by those of ordinary skill in the art, without deviating from The essence of technical solution of the present invention and protection domain.

Claims

1. for the microRNA biomarker of human thyroid carcinomas diagnosis, it is characterised in that including: hsa-miR-193b-3p, Hsa-miR-384, hsa-miR-145-5p, hsa-miR-424-5p and hsa-miR-143-3p；Described hsa-miR-193b-3p Nucleotide sequence as shown in SEQ ID NO.1；The nucleotide sequence of described hsa-miR-384 is as shown in SEQ ID NO.2；Institute State the nucleotide sequence of hsa-miR-145-5p as shown in SEQ ID NO.3；The nucleotide sequence of described hsa-miR-424-5p As shown in SEQ ID NO.4；The nucleotide sequence of described hsa-miR-143-3p is as shown in SEQ ID NO.5.

MicroRNA biomarker for human thyroid carcinomas diagnosis the most according to claim 1, it is characterised in that: institute Stating microRNA biomarker is human serum microRNA biomarker.

3. human thyroid carcinomas diagnosis microRNA primer, the combination of probe, it is characterised in that: include hsa-miR-193b-3p Primer, probe, hsa-miR-384 primer, probe, hsa-miR-145-5p primer, probe, hsa-miR-424-5p primer, spy Pin, hsa-miR-143-3p primer, probe；Described primer draws after primer and quantitative PCR before including reverse transcription primer, quantitative PCR Thing；The reverse transcription primer sequence of hsa-miR-193b-3p as shown in SEQ ID NO.6, primer sequence such as SEQ ID before quantitative PCR Shown in NO.7, after quantitative PCR, primer sequence is as shown in SEQ ID NO.16；The reverse transcription primer sequence such as SEQ of hsa-miR-384 Shown in ID NO.8, before quantitative PCR, primer sequence is as shown in SEQ ID NO.9, primer sequence such as SEQ ID after quantitative PCR Shown in NO.16；The reverse transcription primer sequence of hsa-miR-145-5p as shown in SEQ ID NO.10, primer sequence before quantitative PCR As shown in SEQ ID NO.11, after quantitative PCR, primer sequence is as shown in SEQ ID NO.16；The reverse transcription of hsa-miR-424-5p Primer sequence is as shown in SEQ ID NO.12, and before quantitative PCR, primer sequence is as shown in SEQ ID NO.13, primer after quantitative PCR Sequence is as shown in SEQ ID NO.16；The reverse transcription primer sequence of hsa-miR-143-3p is as shown in SEQ ID NO.14, quantitatively Before PCR, primer sequence is as shown in SEQ ID NO.15, and after quantitative PCR, primer sequence is as shown in SEQ ID NO.16；Respectively The nucleotide sequence of microRNA probe is as shown in SEQ ID NO.17.

4. the tumor diagnosis kit of a human thyroid carcinomas, it is characterised in that: include microRNA as claimed in claim 3 Primer, the combination of probe.

The tumor diagnosis kit of human thyroid carcinomas the most according to claim 4, it is characterised in that: also include reverse transcription Enzyme, buffer, dNTPs, MgCl₂, DEPC water, Taq enzyme and standard substance and/or reference substance.