乙肝病毒前C基因突变株感染者细胞免疫功能的观察

目的 检测乙型肝炎病毒（ＨＢＶ）前Ｃ基因突变体感染者的细胞免疫水平,探讨细胞免疫与前Ｃ基因突变的关系。方法 用多聚酶链反应（ＰＣＲ）结合地高辛标记的寡核苷酸探针杂交技术从６０名慢性乙肝患者中筛选出ＨＢＶ前Ｃ基因突变株感染者,ＨＢＶ野毒株感染者及ＨＢＶ已清除者各５人,用血源性ＨＢｓＡｇ和ＣＤ＾４＋Ｔ辅助细胞识别的抗原表位ＨＢｃＡｇ５０－６９合成多肽进行特异性淋巴结转移转化实验,结果 ＨＢＶ前Ｃ基因突     

Sanger sequencing versus INNO-LiPA® HBV PreCore assay for routine detection of precore and basal core promoter mutations in hepatitis virus B chronically infected patients

We compared the Sanger sequencing and the commercial INNO-LiPA® HBV assay for the routine detection of precore (PC) and basal core promoter (BCP) mutations of hepatitis B virus in chronically infected patients. The overall agreement rate between assays was 94.2% and 98.8% for the detection of PC and BCP mutations, respectively.     

乙型肝炎病毒前C基因区变异与乙肝病毒复制关系的临床研究

目的探讨乙型肝炎病毒（Hepatitis B Virus,HBV）前C基因区变异与HBV-DNA载量的关系。方法通过DNA扩增、基因序列分析检测21例慢性肝炎、18例肝硬化和15例肝癌血清的HBV前C区和基本核心启动子（Basic Core Promoter,BCP）基因序列,荧光定量聚合酶链反应技术定量检测血清中的HBV-DNA。结果野生株与前C区终止变异、BCP双变异以及联合变异组HBV-DNA载量测定差异无显著性（P〉0.05）;BCP双变异HBV-DNA载量HBeAg（-）组显著高于HBeAg（＋）组（P〉0.05）。结论前C区终止变异和BCP双变异对HBV DNA复制无明显影响。HBeAg（-）的慢性肝病患者BCP变异后HBV DNA复制明显活跃。     

Hepatitis B virus subgenotype C2- and B2-associated mutation patterns may be responsible for liver cirrhosis and hepatocellular carcinoma,respectively

The objective of this study was to examine hepatitis B virus (HBV) subgenotypes and mutations in enhancer II, basal core promoter, and precore regions of HBV in relation to risks of liver cirrhosis (LC) and hepatocellular carcinoma (HCC) in Southeast China. A case-control study was performed, including chronic hepatitis B (CHB; n=125), LC (n=120), and HCC (n=136). HBV was genotyped by multiplex polymerase chain reaction and subgenotyped by restriction fragment length polymorphism. HBV mutations were measured by DNA sequencing. HBV genotype C (68.2%) predominated and genotype B (30.2%) was the second most common. Of these, C2 (67.5%) was the most prevalent subgenotype, and B2 (30.2%) ranked second. Thirteen mutations with a frequency >5% were detected. Seven mutation patterns (C1653T, G1719T, G1730C, T1753C, A1762T, G1764A, and G1799C) were associated with C2, and four patterns (C1810T, A1846T, G1862T, and G1896A) were associated with B2. Six patterns (C1653T, G1730C, T1753C, A1762T, G1764A, and G1799C) were obviously associated with LC, and 10 patterns (C1653T, G1730C, T1753C, A1762T, G1764A, G1799C, C1810T, A1846T, G1862T, and G1896A) were significantly associated with HCC compared with CHB. Four patterns (C1810T, A1846T, G1862T, and G1896A) were significantly associated with HCC compared with LC. Multivariate regression analyses showed that HBV subgenotype C2 and C2-associated mutation patterns (C1653T, T1753C, A1762T, and G1764A) were independent risk factors for LC when CHB was the control, and that B2-associated mutation patterns (C1810T, A1846T, G1862T, and G1896A) were independent risk factors for HCC when LC was the control.     

乙型肝炎病毒C基因启动子和前C基因变异与HBeAg含量和肝炎病情的临床研究

研究乙型肝炎病毒(HBV)C基因启动子(CP)和前C基因变异对HBeAg表达和病情的影响。通过DNA扩增、基因序列分析检测48例慢性乙肝和12例慢性重型乙肝患者血清的HBV CP和前C基因序列,及通过微粒子发光法定量检测血清中HBeAg的含量。(1)前C终止变异(nt1896G→A)在重型乙型肝炎病例中的发生率显著升高(66.7％);CP双变异(nt1762A→T和1764G→A)则在慢性乙型肝炎中度和重度的病例中的发生率显著升高(分别为52.6％和54.5％)。(2)双变异组和终止变异组的HBeAg含量均显著下降,P<0.01。但终止变异组HBeAg含量的下降较双变异组更为明显,P<0.05,且eAb阳性率也显著升高,P相似文献   

乙型肝炎病毒C基因启动子和前C基因变异对HBeAg含量和HBVDNA定量及肝炎病情的影响

目的　研究乙型肝炎病毒 (HBV)C基因启动子 (CP)和前C基因变异对HBeAg含量和HBVDNA定量及肝炎病情的影响。方法　通过DNA扩增、基因序列分析检测 75例慢性乙肝、 14例慢性重型乙肝和 34例肝硬化患者的血清HBVCP和前C基因序列 ,通过微粒子发光法定量检测血清中HBeAg的含量 ,通过荧光定量PCR技术检测血清HBVDNA含量。结果　 (1)中度和重度慢性乙型肝炎 (CH)患者CP双变异 (nt176 2A→T和 176 4G→A)的发生率同轻度CH组比较显著升高 (分别为 6 1 3%和 6 1 1%VS 2 3 1% ) ;肝硬化组患者CP双变异发生率同CH组比较显著升高(76 5 %VS 4 8 0 % )。前C基因终止变异 (nt1896G→A)在重型乙型肝炎患者中的发生率显著升高 (71 4 % )。 (2 )双变异组和终止变异组患者HBeAg含量均显著下降 ,但后者下降更明显。双变异组的HBeAb阳性率和对照组比较无明显差异 ,但终止变异组的HBeAb阳性率同双变异组和对照组比较差异显著。终止变异联合双变异组的HBeAg含量及HBeAb阳性率同终止变异组相似。 (3)双变异组和对照组患者HBVDNA含量间无明显差异。结论　CP双变异和前C基因终止变异均影响HBeAg表达 ,但后者影响更大 ;在对病情影响上 ,前者与肝硬化发病有关 ,后者则与重型乙肝发病有关。     

Retrospective study investigating the prevalence and clinical significance of hepatitis B virus precore and basal core promoter variants

BACKGROUND:

Hepatitis B virus (HBV) precore (PC) and basal core promoter (BCP) variants are well known; however, their prevalence in North America is unclear, especially among hepatitis B e antigen-negative patients.

OBJECTIVE:

To investigate the prevalence of PC/BCP mutations and their clinical significance.

METHODS:

One hundred twenty-eight patients positive for both hepatitis B surface antigen and hepatitis B e antibody were selected, and PC/BCP mutations were identified using a line probe assay. The subjects’ charts were reviewed for race/ethnicity, HBV genotype, HBV viral load, sex, liver enzyme levels, imaging and biopsy results up to 10 years before the study.

RESULTS:

The prevalence of PC and BCP variants were 47.6% and 62.5%, respectively. Older age was associated with aspartate aminotransferase-to-platelet index ratio (APRI) ≥0.7 (P=0.011) and abnormal imaging/biopsy results (P=0.0008). Although the presence of BCP variant(s) was associated with APRI ≥0.7 (P=0.029), it was not associated with abnormal imaging/biopsy results. The combination of age ≥50 years and the presence of BCP variant(s) was associated with abnormal imaging/biopsy results, suggestive of either cirrhosis or hepatocellular carcinoma (not observed with PC mutation). Neither sex or genotype, or median HBV viral load showed significant influence on any of these outcomes.

CONCLUSIONS:

The present study suggests that the prevalence of PC and BCP mutations are higher than what has been previously reported. One potential explanation would be increased immigration in the past decade. Considering the potential public health and clinical implications of these variants, long-term multicentre and prospective studies could further unravel the uncertainty around these variants.     

G1896A Precore Mutation and Association With HBeAg Status,Genotype and Clinical Status in Patients With Chronic Hepatitis B

Background:

Precore stop codon (G1896A) mutation is one of the commonest mutations found in patients with chronic hepatitis B. However, over the years, this mutation was not reported much in Malaysia.

Objectives:

We therefore investigated the presence of G1896A mutation in Malaysian population and its association with HBeAg status, clinical stage, hepatitis B virus (HBV) genotype and e-seroconversion rate.

Patients and Methods:

Serum samples from 93 patients confirmed as hepatitis B carriers were collected for molecular assay. The whole genome of HBV was amplified by polymerase chain reaction and directly sequenced. The precore and basal core promoter regions were analyzed for presence of mutations.

Results:

The most commonly observed mutation in the precore region was C1858T with 64.5% prevalence. The precore mutation of interest (G1896A) was identified in 25.8% of isolates. The basal core promoter mutations detected were A1762T-G1764A (26.9%), C1653T (8.6%), A1752G (10.8%) and C1766T (2.2%). No significant association was observed between G1896A mutation and HBeAg-negativity. Nonetheless, G1896A was highly prevalent among HBV genotype B. Clinical association revealed that subjects with G1896A mutations were mainly detected in asymptomatic chronic hepatitis B (58.3%) and liver cirrhosis (41.7%). One subject was diagnosed with fulminant hepatitis (4.2%) and 8.3% had hepatocellular carcinoma (HCC).

Conclusions:

Our data suggested an intermediate prevalence of G1896A mutation among Malaysian hepatitis B carriers. The stop codon mutation has a significant association with genotype B and patients with chronic hepatitis B and liver cirrhosis.     

乙型肝炎病毒前核心区基因变异的研究

应用聚合酶链（ＰＣＲ）方法，分别扩增乙型肝炎病毒（ＨＢＶ）标志为ＨＢｓＡｇ（＋），ＨＢｅＡｇ（＋）抗ＨＢｃ（＋）的慢性乙型肝炎（ＣＨＢ）１８例（第一组，ＨＢＶ标志物为ＨＢｓＡｇ（＋），抗ＨＢｅ（＋）和抗ＨＢｃ（＋）的慢性乙型肝炎２１例（第二组，以及ＨＢＶ标志与第二组相同的体检健康的正常人１５例（第三组），其ＰＣＲ的阳性率分别为８３．３％，７１．４％和３３．３％，第二组与第三组要紫有显著差异（Ｐ〈０     

Association of core promoter mutations of hepatitis B virus and viral load is different in HBeAg（＋） and HBeAg（-） patients

AIM:To identify the prevalence of hepatitis B e antigen (HBeAg) and to assess the association of hepatitis B virus (HBV) core promoter mutations and viral load in Indonesian patients.METHODS:Sixty-four patients with chronic hepatitis,65 with liver cirrhosis and 50 with hepatocellular carcinoma were included in this study.HBeAg and hepatitis B e antibody (HBeAb) tests were performed using enzyme-linked immunosorbent assay and the mutations were analyzed by sequencing.Viral load was measured by real-time poly...