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Method for measuring drug fast variation of hepatitis b virus to Adefovir

A hepatitis B virus and drug-resistant technology, applied in the field of medical testing, can solve the problems of cumbersome operation, time-consuming, lack of detection methods, etc., and achieve the effect of improving detection efficiency, high sensitivity and accuracy, and intuitive and easy-to-judge detection results

Inactive Publication Date: 2007-07-25
AFFILIATED HUSN HOSPITAL OF FUDAN UNIV
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AI Technical Summary

Problems solved by technology

At present, PCR-RFLP has been used to detect rtA181V / T / S mutation or rtN236T mutation respectively, but when judging whether there is adefovir resistance in clinical practice, both rtA181V / T / S and rtN236T mutation forms must be detected at the same time. If the PCR-RFLP method is used for detection, it is necessary to establish two sets of PCR amplification systems to amplify the HBV DNA template twice, and then carry out enzyme digestion and detection. The operation is cumbersome and time-consuming
At present, there is still a lack of simple and sensitive detection methods in clinical practice.

Method used

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  • Method for measuring drug fast variation of hepatitis b virus to Adefovir
  • Method for measuring drug fast variation of hepatitis b virus to Adefovir

Examples

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Embodiment 1

[0047] (1) Extract the HBV DNA in the patient's serum by classical alkaline lysis-phenol / chloroform extraction method, add 100 μl serum to 300 μl TES solution (10mM Tris-HCl, pH8.0, 5mM EDTA, 0.5% SDS, 50μg Protease K), mix Digest at 65°C for 3 hours, extract with equal volumes of phenol / chloroform and chloroform once each, add 2 times the volume of absolute ethanol and 1 / 10 volume of 3M sodium acetate (pH 4.8) to the supernatant to precipitate DNA, rinse once with 70% ethanol, The DNA was dissolved in 20 μl sterilized double distilled water and stored at -70°C for later use.

[0048] (2) Design of PCR-RFLP detection method ADV drug resistance-related mutations mainly involved the changes of 2 amino acids, namely 181 and 236. Before designing the PCR-RFLP detection method, it is necessary to understand the polymorphism analysis of the nucleotide sequence encoding the 181, 236 and adjacent amino acids of the RT region. For this reason, the present invention downloads the whole...

Embodiment 2

[0053] Sensitivity experiment to verify this method-cloning of RT region gene fragments containing ADV drug resistance-related mutations

[0054] PCR primers (Table 3) were designed on both sides of the A-E motif in the RT region of HBV polymerase, and the HBV DNA extracted above was used as a template to amplify by nested PCR. The upstream and downstream primers of the first round were RTS1 and RTAS1 respectively, and the upstream and downstream primers of the second round of PCR were RTS2 and RTAS2. The PCR amplification conditions were: 94°C for 30s, 56°C for 60s, and 72°C for 45s, a total of 35 cycles. The system is 50ul. PCR amplification uses Premix Taq enzyme. The PCR products were directly sequenced after gel extraction and purification. The PMD18-T Vector TA cloning kit was used to screen the clone containing the target fragment, and the plasmid was identified by SacI and PstI double enzyme digestion and sequencing analysis. 10 cloned plasmids were sequenced for ea...

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Abstract

A method for determining adfuwei tolerance variation of hepatitis B virus includes designing specific primer, carrying out amplification by set of PCR means, using BgII and BseDI to carry out enzyme cut reaction electrophoresis on amplified product then carrying out restrictive section length polymorphism analysis.

Description

technical field [0001] The invention belongs to the field of medical testing, and relates to a detection method of drug resistance genes, in particular to a clinical monitoring method of drug resistance of chronic hepatitis B patients treated with adefovir dipivoxil (ADV) antiviral treatment. Background technique [0002] The clinical application of nucleoside analog anti-hepatitis B virus (HBV) drugs represented by lamivudine is a milestone in the history of chronic hepatitis B treatment. So far, more than 1 million chronic hepatitis B patients have received lamivudine treatment, which has made great progress in the treatment of chronic hepatitis B. While the widespread use of anti-HBV drugs has brought good news to patients with chronic hepatitis B, it has also brought serious drug resistance problems. For example, the resistance rates of lamivudine treatment for 1 to 4 years can be as high as 14%, 38%, 49% and 66%, respectively. Adefovir dipivoxil (adefovir dipivoxil) i...

Claims

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Application Information

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IPC IPC(8): G01N33/48G01N27/447C12Q1/18
Inventor 张继明毛日成尹有宽王新宇
Owner AFFILIATED HUSN HOSPITAL OF FUDAN UNIV
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