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Development of a Hepatitis B Virus Reporter System to Monitor the Early Stages of the Replication Cycle
Published on: February 1, 2017
[Core promoter mutations of HBV isolated from patients with chronic hepatitis B in Guangxi]
Zhong-liao Fang1, Hui Zhuang, Xian-min Ge
1Centre for Diseases Control of Guangxi Zhuangzu Autonomous Region, Nanning 530021, China.
Insights
Hepatitis B virus (HBV) core promoter mutations are prevalent in chronic hepatitis B patients in Guangxi. The T1762A1764 mutant is linked to HBeAg status and liver damage.
Area of Science:
- Virology
- Hepatology
- Molecular Biology
Context:
- Chronic hepatitis B (CHB) is a significant global health concern.
- The hepatitis B virus (HBV) core promoter plays a crucial role in viral replication.
- Understanding HBV mutations is key to managing CHB progression.
Purpose:
- To investigate the prevalence of HBV core promoter mutations in CHB patients.
- To explore the association between these mutations and liver damage.
- To determine the relationship between HBV core promoter mutations and hepatitis B e antigen (HBeAg) status.
Summary:
- A study analyzed 59 CHB patients in Guangxi using nested PCR and sequencing.
- HBV DNA was detected in 59.3% of patients, with all positive cases showing mutations.
- The T1762A1764 double mutation was most common (57.1%), followed by C1799G (54.4%).
- The T1762A1764 mutant showed a significant association with HBeAg-negative status (79.0%) compared to HBeAg-positive status (31.3%).
Impact:
- HBV core promoter mutations are common in CHB patients in this region.
- The T1762A1764 mutation is a significant indicator of HBeAg status.
- Findings contribute to understanding HBV pathogenesis and may inform clinical management strategies.
Objective:
To explore the relationship between HBV core promoter mutations and liver damage or HBeAg status.
Methods:
Nested polymerase chain reaction (nPCR) was used for amplification of HBV DNA core promoter in 59 sera from patients with chronic hepatitis B in Guangxi, then the HBV DNA positive products were sequenced by direct sequencing.
Results:
The HBV DNA positive rate of was 59.3%(35/59). All the patients were infected by mutants. The commonest mutation was the double mutation (A --> T at nt1762 and G --> A at nt1764), counting for 57.1% (20/35). The next was C --> G at nt1799, counting for 54.4% (19/35), but this was no function. A --> G at nt1752 (resulting in isoleucine to valine) was seen in 37.1% (13/35) of the HBV DNA positive patients, and T --> C at nt1753 was seen in 20% (7/35). The significant difference in the frequency of T1762A1764 mutant was found between HBeAg positive patients (31.3%) and negative patients (79.0%).
Conclusions:
HBV core promoter mutations are common among patients with chronic hepatitis B in Guangxi. T1762A1764 mutant is associated with HBeAg status and chronic hepatitis.
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