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Oligonucleotide composition, kit, method and application for detecting hepatitis B virus rcDNA and/or cccDNA

An oligonucleotide and hepatitis B virus technology, applied in the field of detection of hepatitis B virus, can solve the problems of lack of quantitative detection methods of HBV rcDNA and the inability to directly reflect the level of rcDNA

Active Publication Date: 2020-11-13
北京旌准医疗科技有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Since the primers for the X, S, PreC / C regions can only be amplified with HBV single negative strand DNA as a template, it cannot directly reflect the rcDNA level of the newly synthesized progeny virus
It can be seen that there is still a lack of specific quantitative detection methods for HBV rcDNA.

Method used

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  • Oligonucleotide composition, kit, method and application for detecting hepatitis B virus rcDNA and/or cccDNA
  • Oligonucleotide composition, kit, method and application for detecting hepatitis B virus rcDNA and/or cccDNA
  • Oligonucleotide composition, kit, method and application for detecting hepatitis B virus rcDNA and/or cccDNA

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Experimental program
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Embodiment 1

[0086] 1. Design of primers

[0087] A variety of genotype (A-H) HBV reference sequences were downloaded from GenBank, the conserved sequences of different genotypes of HBV were analyzed by MegAlign software, and multiple pairs of primers and probes for HBV rcDNA and / or cccDNA detection were designed, see Table 1. For the positions of the binding regions of some primers, see Figure 4 and Figure 5 .

[0088] Table 1. Primer and probe sequences for HBV rcDNA and / or cccDNA detection

[0089] sequence name sequence ID HRD-F1 TTCACCTCTGCACGTCGCATG SEQ ID NO:1 HRD-F2 GGAGACCACCGTGAACGCCCA SEQ ID NO:2 HRD-F3 CAGGAACCTGCCCAAGGTCTT SEQ ID NO:3 HRD-F4 GCATAAGAGGACTCTTGGACT SEQ ID NO:4 HRD-F5 GGACTCTTGGACTTTCAGCAAT SEQ ID NO:5 HRD-F6 AGGACTCTTGGACTTTCAGCAA SEQ ID NO:6 HRD-F7 TTCAGCAATGTCAACGACCGA SEQ ID NO:7 HRD-F8 CCTTGAGGCATACTTCAAAG SEQ ID NO:8 HRD-F9 CTTCAAAGACTGTGTGTTTA SEQ ID NO:9 ...

Embodiment 2

[0111] This embodiment is an exemplary method for detecting the level of hepatitis B virus rcDNA and / or cccDNA.

[0112] The level of hepatitis B virus was detected using the oligonucleotide composition of the present invention as a primer. The oligonucleotide composition of the present invention specifically binds to the initiation site of HBV positive strand DNA synthesis formed after correct jumping, so that the detection template is limited to progeny virus particles synthesized by positive strand jumping and synthesis after negative strand synthesis HBV DNA, namely rcDNA. The detection of rcDNA can more accurately reflect the replication-competent HBV virus. Compared with the existing HBV DNA quantitative primers for detecting PreC / C, S, and X regions of HBV DNA used in clinical practice, the primers of the present invention enable the method of the present invention to more accurately reflect the activity of HBV virus in the body. The comparison between the method of t...

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Abstract

The invention discloses an oligonucleotide composition and a method for detecting hepatitis B virus (HBV) rcDNA (Relaxed Circular deoxyribonucleic acid) and / or cccDNA (Covalently Closed Circular DNA), a kit and application of the oligonucleotide composition. The oligonucleotide composition comprises first oligonucleotide, second oligonucleotide, or oligonucleotide complementary with the sequenceof the first oligonucleotide and oligonucleotide complementary with the sequence of the second oligonucleotide; the first oligonucleotide is specifically combined with at least one part of continuoussequence of the first sequence, and the second oligonucleotide is specifically combined with at least one part of continuous sequence of the second sequence; in addition, a distance between two continuous sequences is 30-350 nt; the first sequence is a sequence between DR (Direct Repeat) 2-DR1 of the HBV DR sequence of a cross-notch area which contains cccDNA or rcDNA, and the second sequence is asequence after the fifth basic group of the DR1. According to the oligonucleotide composition, the level of HBV rcDNA and / or cccDNA can be effectively detected without being affected by integrated HBV DNA.

Description

technical field [0001] The invention relates to the detection of hepatitis B virus, in particular to an oligonucleotide composition, kit and method for detecting rcDNA and / or cccDNA of the hepatitis B virus. Background technique [0002] Hepatitis B virus (HBV) infection is prevalent worldwide, and the epidemic intensity of HBV infection varies greatly in different regions. According to the similarity of viral genome sequence, HBV is divided into at least 10 genotypes (A-J). According to the report of the World Health Organization, about 2 billion people in the world have been infected with HBV, and 240 million of them are chronic HBV infected people. my country is a medium-to-high endemic area, and HBV infection is dominated by types B and C. In the 2006 national hepatitis B serum epidemiological survey, the HBsAg carrier rate of the general population aged 1-59 in my country was 7.18%. Based on this calculation, there are about 93 million chronic HBV-infected people in ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C12Q1/70C12Q1/686C12N15/11
CPCC12Q1/686C12Q1/706C12Q2561/113C12Q2563/107C12Q2545/114
Inventor 鲁凤民刘永振邹军
Owner 北京旌准医疗科技有限公司
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