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DNA molecular probe and application in miRNA real-time quantitative PCR detection in tumor cells of green bean nuclease

A DNA molecule, mung bean nuclease technology, applied in the field of miRNA detection in tumor cells, can solve the problems of increasing experimental errors, many experimental steps, time-consuming detection errors, etc.

Inactive Publication Date: 2018-05-04
CHINA THREE GORGES UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this method still needs reverse transcription reaction to amplify the first cDNA strand of miRNA, so there are many experimental steps, which will inevitably increase experimental errors; when this method is used in high-throughput screening experiments, it is time-consuming and has detection errors. bigger

Method used

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  • DNA molecular probe and application in miRNA real-time quantitative PCR detection in tumor cells of green bean nuclease
  • DNA molecular probe and application in miRNA real-time quantitative PCR detection in tumor cells of green bean nuclease
  • DNA molecular probe and application in miRNA real-time quantitative PCR detection in tumor cells of green bean nuclease

Examples

Experimental program
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Effect test

Embodiment 1

[0048] 1) The experiment was divided into a normal cell control group (human bronchial epithelial HBE cells) and a tumor cell experimental group (human non-small cell lung cancer A549 cells). The culture and other experimental operating conditions of the two groups of cells were the same. It is expected that the theoretical length of the PCR amplification product is about 65bp.

[0049] 2) subculture human non-small cell lung cancer A549 cells and human bronchial epithelial HBE cells into 6-well cell culture plates, and routinely culture them in DMEM medium containing 10% calf serum (volume percentage) (95% humidity, 37°C , 5% CO 2 (volume percentage) until the cell growth reaches 80% confluency.

[0050] 3) The cell culture medium was discarded, and the remaining cell culture medium was washed away with PBS buffer, then Trizol reagent was added, and the total RNA of A549 cells and human bronchial epithelial HBE cells was extracted according to the standard total RNA extracti...

Embodiment 2

[0068] Other cases of tumor cell proliferation detection:

[0069] 1) The experiment was divided into normal cell control group (breast normal epithelial cells MCF-10A–parental, human embryonic kidney epithelial 293T cells) and tumor cell experimental group (human breast cancer MDA-MB-231 cells and human cervical cancer Hela cells), The culture and other experimental operating conditions of the two groups of cells were the same. It is expected that the theoretical length of the PCR amplification product is about 65bp.

[0070] 2) Subculture MCF-10A-parental, MDA-MB-231, 293T and Hela cells into 6-well cell culture plates respectively, and perform cell culture according to the method described in Example 1.

[0071] 3) The method described in Example 1 was used to set up positive controls and negative controls, and Beta-Actin was used as the sample internal reference.

[0072] 4) The method described in Example 1 was used to perform experimental operations such as RNA extract...

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Abstract

The invention provides a DNA molecular probe. The molecular probe is a DNA molecular probe of miRNA Let-7b; and the DNA molecular probe has stem-loop structure. The DNA molecular probe provided by theinvention is applicable to miRNA detection in tumor cells; experimental results show that the miRNA Let-7b is low in expression in human non-small cell lung cancer cells, breast cancer cells and cervical cancer cells and is high in expression in normal human pulmonary epithelial cells, breast cancer epithelial cells and human embryonic kidney epithelial cells; and an miRNA expression level in thetumor cells can be conveniently and effectively detected.

Description

technical field [0001] The invention relates to the field of biomedicine, in particular to a detection method and application of miRNA (microRNA, microRNA) in tumor cells. Background technique [0002] miRNA is a single-stranded small molecule RNA expressed endogenously in organisms, which is a kind of non-coding RNA. Physiological and pathological processes such as immune regulation and tumorigenesis. The abnormal expression of miRNA itself is an important factor in the occurrence and development of tumors, so detecting the expression level of miRNA in tumor cells is one of the important techniques for anti-tumor research. However, the length of mature miRNA is only about 20-24 nucleotides, and there is no polyadenylic acid tail, so the detection method of mRNA (messenger RNA) cannot be used, that is, the first strand of cDNA is obtained by reverse transcription and the specific PCR primers were used for detection. [0003] There are three methods widely used to detect m...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C12Q1/6851C12N15/11
CPCC12Q1/6851C12Q2531/113C12Q2525/207C12Q2525/301C12Q2521/307
Inventor 曹春雨杨凡王发玲王艳林
Owner CHINA THREE GORGES UNIV