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miRNA detection kit based on thio-modified ring-mediated isothermal amplification method

A loop-mediated isothermal, detection kit technology, applied in the biological field, can solve the problems of long time, cumbersome, low sensitivity, etc.

Active Publication Date: 2021-10-19
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, each method has its own disadvantages, such as low detection throughput, cumbersome, time-consuming, low sensitivity, prone to false positive results, etc.

Method used

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  • miRNA detection kit based on thio-modified ring-mediated isothermal amplification method
  • miRNA detection kit based on thio-modified ring-mediated isothermal amplification method
  • miRNA detection kit based on thio-modified ring-mediated isothermal amplification method

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Effect test

Embodiment 1

[0045] A miRNA detection kit based on thio-modified ring-mediated isothermal amplification method, which can detect the concentration of target miRNA based on thio-modified ring-mediated isothermal amplification. Taking miR-200a as the detection object as an example, the complementary sequence of the target miRNA is divided into two parts, which are respectively designed on the hairpin structure DNA of two linker probes Linker A / B. When the target miRNA appears, the two Linker probes The needles are hybridized with miRNAs, close to each other, and ligated under the action of SplintR ligase to form dumbbell-shaped amplicons with stem-loop structures at both ends. Amplification primers (PS FIP / BIP) are added to the reaction system to combine the amplicon with the internal primer, and start DNA synthesis driven by Bst 2.0 DNA polymerase with strand displacement activity to form a new hairpin structure and extend it. A cyclic amplification and strand displacement process results i...

Embodiment 2

[0061] 1. Materials and methods

[0062] 1.1 Primers and probes

[0063] The LAMP primers in this kit are provided by PrimerExplorer V5 ( http: / / primerexplorer.jp / lampv5e / index.html )design. The primer and probe sequences are as follows (bases underlined are thiox):

[0064] Connector probe:

[0065] Linker A

[0066] AGCACCCTCAACATCGAAGC ACTCGTGAAGAGGCTGTAAGGCAAGTTCGAAGCTGGATAGGCTTCGATGTTGAGGGTGCTACATCGTTACC,

[0067] Linker B

[0068] Phosphate AGACAGTGTTATGCTTCCCGTAATGCATGTGGCACCAATGTGCCTCTACAATTAGGATTTTCAACTGGTGTGAACTTTGTTGTTCAGCCAGT CCACATGCATTACGGGAAGCA .

[0069] Thio primer:

[0070] PS FIP primer

[0071] AGCACCCTCAACATCGAAGC ACTCGTGAAGAGGCTGTA,

[0072] PS BIP primer

[0073] TGCTTCCCGTAATGCATGTGG ACTGGCTGAACAACAAAGT.

[0074] Signal probe:

[0075] FAM CACACCACTTCTACAATTAGGATTTTCAACTGGTGTG BHQ.

[0076] All DNA sequences were synthesized by Shanghai Sangon Bioengineering Co., Ltd.

[0077] 1.2 RNA extraction from cell samples

[0078]AxyPrep...

Embodiment 3

[0093] Detection of miRNA concentration in cells

[0094] Using the standard curve method, the PS-LAMP method was applied to the determination of the content of miR-200a in the total RNA samples extracted from HT 29 human colon cancer cells. The results showed that miR-200a in the total RNA of human colon cancer cells (0.5 μg / μL) The content is 0.65pmol / L, which is consistent with the determination result of stem-loop RT-PCR.

[0095] Detection of miRNA concentration in serum

[0096] The PS-LAMP method was applied to the screening of novel miRNA tumor markers in papillary thyroid carcinoma in serum. Compared with healthy people, in the serum of patients with papillary thyroid carcinoma, miR-146 was significantly increased, while miR-199 was significantly decreased. A miRNA as a biomarker can effectively screen out patients with thyroid cancer. As shown in Table 1, the concentrations of miR-146 and miR-199 in the serum of patients with papillary thyroid carcinoma and healthy...

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Abstract

The invention provides a miRNA detection kit based on a thio-modified ring-mediated isothermal amplification method, which is composed of a ring-mediated amplification reaction solution, enzyme, primer and probe mixed solution, and a standard product. In the present invention, the dumbbell-shaped DNA formed by ligation of linker probes Linker A / B modified by base thio in the presence of target miRNA is used as an amplicon, and combined with FIP / BIP primers modified by the same part of base thio, triggering a LAMP index Level amplification, the thio-modified DNA structure can further enhance the amplification efficiency, and the formed amplification product turns on the signal probe-molecular beacon to generate a fluorescent signal, and the fluorescent signal of the target product is monitored by a real-time fluorescent quantitative PCR instrument to detect the target miRNA , has the characteristics of strong stability, good specificity and high sensitivity. The invention can be used to detect multiple miRNAs in serum of patients with thyroid papillary carcinoma, and can be used as a tumor marker for auxiliary diagnosis of thyroid papillary carcinoma.

Description

technical field [0001] The invention belongs to the field of biotechnology, and relates to a new technology for detecting miRNA concentration in biological samples (cells, serum, etc.) of patients with major diseases such as tumors, in particular to a miRNA detection kit based on thio-modified ring-mediated isothermal amplification. It can provide a highly sensitive basis for auxiliary judgment of tumor markers in biological samples for the early diagnosis of clinical thyroid cancer and other major diseases. Background technique [0002] miRNA is a class of single-stranded non-coding RNA molecules with a length of about 20-25 nucleotides. It is also one of the important biomarkers used in modern molecular biology to identify various cellular functions, biology and pathological processes. miRNAs recognize mRNA target sequences through complementary base pairing to regulate post-transcriptional modification of gene transcription, interfere with the translation of mRNA, or caus...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C12Q1/6886C12Q1/6851
CPCC12Q1/6851C12Q1/6886C12Q2600/158C12Q2600/166C12Q2600/178C12Q2531/119C12Q2525/117C12Q2563/107C12Q2525/207C12Q2545/114C12Q2537/1376
Inventor 蔡圣加德拉·塔拉甫沈敏哲余露山曾苏
Owner ZHEJIANG UNIV
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