乙型肝炎病毒BCP区1762/1764突变与肝细胞癌发生的相关性

全球有4亿HBV携带者,每年因HBV相关疾病而死亡的人数已经超过200万,其中有100万死于HBV诱发的肝细胞癌[1]。HBV核心蛋白启动子（BCP）的变异是多位点和复合的,主要是1762（A-T）、1764（G-A）的双突变,BCP区是富含AT的区域,具有肝脏富含因子的独立结合点,变异的BCP可改变这种结合,降低前C区的RNA转录,最终使HBeAg表达减少,平均降低70%。BCP的变异还可使前基因组RNA转录增强2~     

HBeAg阳性慢性乙型肝炎初治患者BCP区A1762T/G1764A变异株定量检测结果分析

目的探讨HBeAg阳性慢性乙型肝炎初治患者BCP区A1762T/G1764A变异株定量检测的临床意义。方法通过单标记探针联合选择性阻断实时荧光定量PCR法精确定量检测97例HBV DNA阳性慢性乙型肝炎初治患者BCP区A1762T/G1764A变异株,并进行统计学分析。结果 97例HBeAg阳性患者变异株的含量会随着HBV DNA水平的升高而降低(P0.01)。变异株含量同时与HBeAg水平呈显著相关,随着HBeAg水平的升高,变异株含量降低(P0.01)。结论对HBV感染者的BCP区A1762T/G1764A变异株进行定量检测,可对患者病情的可能发展进行预测,从而可以采取有效的防治措施。     

病毒性肝炎最新进展HBV／HCV相关肝细胞癌中，HBV前C基因/C基因的基因型、突变类型及病毒学分析

作研究了肝细胞癌（HCC）患HBV和HCV的复制情况，以及前C基因／C基因的突变类型。研究涉及到38例HCC患，其中18例为HBV／HCV混合感染，20例为HBV单纯感染。还有23例HBV/HCV混合感染但无肝细胞癌的患被定为对照组。通过对HBV和HCV基因组的定性和定量测定来评价病毒复制的活跃性。HBV前C基因／C基因以及与病毒复制相关的前基因组外亮信号用直接测序法来测定。     

HBV基因型及P基因变异与拉米夫定耐药的关系

为探讨拉米夫定耐药与HBV基因型和P基因变异的关系,用基因测序的方法分析基因型与YMDD变异,用荧光定量的方法,检测HBVDNA定量,研究结果表明C基因型比其它基因型更易耐药,耐药的问题不仅仅是 YMDD变异,P基因可能诱导其它基因的变异,导致拉米夫定抗病毒治疗的疗效减低。     

乙型重型肝炎患者血清HBV前C/BCP变异检测及临床意义

目的探索乙型重型肝炎患者HBV前C/BCP区变异与临床病情关系。方法用荧光定量PCR法检测血清HBVDNA载量;PCR扩增前C/BCP区基因后进行序列测定。结果30例乙型重型肝炎患者中BCP变异有18例,HB-VDNA平均水平为2.71×107copies/mL,未发生BCP变异者有12例,HBVDNA平均水平为5.35×106copies/mL,两者间有显著差异。测序结果显示HBV前C区nt1896G→A终止变异和BCP变异(nt1762A→T和1764G→A)在乙型重型肝炎患者中发生率分别为43.3%(13/30)和60%(18/30),在慢性乙型肝炎患者则分别为40%(12/30)和30%(9/30),两组BCP变异(nt1762A→T和1764G→A)相比有显著差异(P=0.02)。结论BCP变异可影响病毒复制,BCP变异可能与肝病的严重程度存在着相关性。     

234例慢性乙型肝炎患者HBV前C/BCP区突变分析

目的调查慢性乙型肝炎患者血清HBV前C/基本核心启动子（BCP）区的突变情况,分析各种突变对HBeAg表达的影响。方法抽提患者血清DNA,采用改进的巢式PCR技术,扩增HBV前C/BCP区基因,对PCR产物进行DNA测序。用NTI软件比对结果,根据文献报道,选取1753、1762、1764、1862、1896和1899共6个位点进行突变分析,并重点分析不同突变对患者血清HBeAg阳性率和病情的影响。结果在234例中6个位点均无突变者为74例（31.6%）,其血清HBeAg阳性率为74.3%（55/74）。在234例中6个位点检出至少1种突变的病例为160例（68.4%）,突变形式包括4种单一位点突变和21种组合形式的突变;检出G1896A突变73例（31.2%）,其中36例检出有共存未突变序列,37例仅检出突变序列,后者血清HBeAg的阳性率为18.9%（7/37）。检出G1896A以外其他形式突变的有87例,HBeAg阳性率为63.2%（55/87）;其中以A1762T＋G1764A最为常见,HBeAg阳性率为69.4%（34/49）。在1753、1862位点上检出4种特殊碱基突变,前C区有基因片段插入或缺失的有2例。结论多数慢性乙型肝炎患者在HBV前C/BCP区可检出突变,突变形式多样,其中G1896A突变样本血清HBeAg阳性率显著下降,而其他突变对其影响较小。应用DNA序列测定法分析HBV前C/BCP区基因突变,获得的信息全面,对临床评估病情进展和实施抗病毒治疗有参考价值。     

肝癌患者血液RASSF1A基因甲基化的检测及其临床意义

目的:探讨原发性肝细胞癌(HCC)患者血清中RASSF1A甲基化状况及RASSF1A甲基化作为一种新的肿瘤分子标志物在HCC早期无创性诊断中的意义和价值.方法:应用甲基化特异性PCR(MSP)技术检测35例HCC患者血清和10例健康对照血清中RASSF1A启动子区甲基化状况.结果:35例HCC患者血清中RASSF1A启动子区甲基化阳性率为40%, 10份健康对照血清中未出现RASSF1A基因甲基化. RASSF1A基因甲基化与HCC患者性别、伴肝硬化、乙肝表面抗原、甲胎蛋白、肿瘤大小、有无包膜、有无门静脉癌栓及病理分级等临床病理参数无关.结论:RASSF1A基因甲基化在HCC的发生中起重要作用, RASSF1A基因甲基化可能是HCC新的肿瘤分子标志物.     

HBV BCP区1762/1764位点变异对肝脏疾病进展及预后的影响

目的:探讨乙型肝炎病毒BCP区A1762T/G1764A变异与肝脏疾病进展的关系。方法:收集78例慢性乙型肝炎患者(CHB)和125例慢性重型乙型肝炎患者(CSHB)的血清及临床资料,并对所有入组患者进行随访,采用聚合酶链反应扩增HBV BCP区基因片段,产物纯化后直接测序,检测BCP区T1762/A1764位点变异。结果:CSHB组患者A1762T、G1764A及A1762T+G1764A的变异频率分别为64.0%(80/125)、60.0%(75/125)、60.0%(75/125),CHB患者3种变异的变异频率分别为30.8%(24/78)、28.2%(22/78)、25.6%(20/78),CSHB组3种变异的变异频率均明显高于CHB组,差异有统计学意义(P0.001)。125例CSHB患者随访48周,死亡组A1762T/G1764A位点变异频率明显高于存活组,差异有统计学意义(x~2=12.42,P0.001);A1762T/G1764A位点变异组的患者累积存活率明显低于未变异组(x~2=9.742,P0.01)。结论:HBV BCP区1762/1764位点变异可能会加重HBV感染后肝脏疾病病情,并且对慢性重型乙型肝炎的发病及预后可能起重要的作用。     

黎族HBV感染者其病毒基因型及C基因启动子/前C区基因突变与肝硬化和肝癌的关系

HBV感染是一个严重的公共卫生问题.在中国,慢性乙型肝炎是导致肝硬化和原发性肝癌的主要危险因素之一[1].目前,根据HBV核苷酸变异＞8％,将HBV分为A～H8种基因型[2].有研究结果显示,HBV基因型、HBV基因组前C区(PreC)第1896位核苷酸G→A(G1896A)以及其启动子(BCP) 1762位核苷酸A→T和1764位核苷酸G→A的突变(BCP A1762T/G1764A)与病毒的复制、转录、抗原表达水平以及疾病的临床过程密切相关[3-4].黎族是海南岛的原住居民,目前关于海南岛黎族肝硬化及肝癌患者HBV基因型、PreC G1896A基因突变和BCP A1762T/G1764A基因突变流行病学分布的研究鲜见报道.本研究旨在了解HBV基因型、PreC G1896A基因突变和BCP A1762T/G1764A基因突变与海南岛黎族肝硬化及肝癌患者发病机制的关系.     

慢性HBV相关肝病患者HBV基因型和耐药突变位点与疾病进展的关系

目的 探讨慢性HBV相关肝病患者HBV基因型和耐药突变位点检测与疾病进展的关系.方法 选取230例经核苷(酸)类似物(NAs)治疗的慢性HBV相关肝病患者作为研究对象,检测其外周血HBV基因型和RT区氨基酸序列耐药突变情况.结果 230例慢性HBV相关肝病患者中100例(43.47％)检出NAs耐药突变,以LAM/Ld...     

慢性乙型肝炎病毒基因型与BCP区变异的临床研究

为了研究乙型肝炎病毒 (HBV)基因型与C基因启动子 (BCP)基因变异的关系 ,对 6 9例慢性乙型肝炎患者分别用聚合酶链反应 (PCR)—限制性片段长度多态性 (RFLP)技术和PCR微板核酸分子杂交技术 ,进行基因分型及HBVBCP基因变异检测。在 6 9例慢性乙型肝炎患者中 ,各基因型发生的BCP区A176 2T/G176 4A双突变分别为C型 18例 (4 3 9% )B型 3例 (16 7% )D型 2例 (2 0 % )。C型的BCP双突变率明显高于B型 ,两者相比有显著性差异(P <0 0 5 )。故可以认为乙型肝炎病毒基因型与BCP区双突变存在有一定的相关性。推测A176 2T/G176 4A双突变可能是造成C型患者比B型存在更严重肝损害的原因之一     

乙型肝炎病毒C基因启动子双变异患者中医证型特点研究

目的：探讨HBVC基因启动子（BCP）双变异慢性乙型肝炎患者的中医证型特点。方法：选择HBsAg阳性慢性乙型肝炎患者168例进行观察。中医证型分为湿热中阻、肝郁脾虚、肝肾阴虚、瘀血阻络、脾肾阳虚5型；BCP双变异检测，采用微板核酸杂交法。结果：BCP双变异的总检出率为36．31％（61／168），其中，湿热中阻型BCP双变异检出率最高（54．24％），与其他各型比较差异均有显著性意义（P〈0．052）；肝郁脾虚型BCP双变异检出率（36．36％）虽低于湿热中阻型（P〈0．025），但却明显高于肝肾阴虚型（13．04％）及瘀血阻络型（10．53％），且差异有显著性意义（P〈0．05）；肝肾阴虚与瘀血阻络两型BCP双变异检出率均较低，两者比较差异有显著性意义（P〉0．05）。结论：HBV BCP双变异的慢性乙型肝炎患者中医证型特点以湿热中阻为主，肝郁脾虚居次，临床治疗要重视清热利湿，舒肝健脾治法或方药的选用。     

肝癌患者血清中乙型肝炎病毒基因分型及临床意义

目的:探讨血清中乙型肝炎病毒(HBV)基因型及HBV DNA水平与肝细胞癌的关系。方法:应用巢式聚合酶链反应扩增乙型肝炎病毒与基因,用末端标记方法对PCR产物标记并直接测序,测序结果和GenBank中登录的标准基因型序列相比较,应用荧光定量PCR法检测HBV DNA水平。对61例肝癌、65例慢性乙型肝炎、10例乙型肝炎病毒携带者进行了检测。结果:136例中B基因型59例(43.4%)、C基因型77例(56.6%),随着病情加重,C基因型比例逐渐增高;不同基因型HBV感染的肝癌患者间HBV DNA水平差异有显著意义,P<0.05;在慢性乙型肝炎患者中,HBV DNA水平差异无显著性意义。结论:本地区乙型肝炎病毒以B、C基因型为主,乙型肝炎病毒C基因型及高水平的HBV DNA感染与肝癌的发生相关。     

HBV C基因基本核心启动子变异对乙型肝炎患者血清病毒复制和细胞因子水平的影响

目的 探讨乙型肝炎病毒（HBV）DNAC基因基本核心启动子（BCP）变异对机体免疫状态及乙型肝炎病毒复制的影响。方法采用PCR微板核酸杂交结合ELISA技术检测HBVDNABCP变异；采用双抗体夹心ELISA法检测患者血清IL-2、IFN-γ、IL-4和IL-10水平；采用荧光定量PCR法测定HBVDNA水平。结果HBVDNABCP变异病人和非变异病人血清IL-2水平分别为61．4±24．7ng／L和65．1±25．3ng／L，IFN-γ为82．0±50．1ng／L和71．8±67．0ng／L，IL-4为62．3±46．0ng／L和59．4±51．0ng／L．IL-10为74．0±88．2ng／L和81．4±67．0ng／L（P均〉0．1）；HBVDNABCP变异病人的HBVDNA水平为1×10^5.82±2.01 copies／ml，明显高于非变异病人的1×10^4.71±1.78 copies／ml（P〈0．01）。结论HBVDNABCP变异对机体血清细胞因子水平无明显影响，但对HBVDNA的复制具有一定的促进作用。     

Clinical significance and evolution of core promoter and precore mutations in HBeAg-positive patients with HBV genotype B and C: a longitudinal study.

BACKGROUND/AIMS: The aims of this longitudinal study were to investigate whether the clinical outcome and evolution of core promoter and precore mutations were different during hepatitis B e antigen (HBeAg) seroconversion between hepatitis B virus (HBV) genotypes B and C in HBeAg-positive patients with chronic hepatitis B. PATIENTS AND METHODS: The core promoter and precore sequences were determined from serial sera of 156 HBeAg-positive patients with chronic HBV infection. RESULTS: In HBV genotype C, the T1762/A1764 mutant was detected earlier than the A1896 mutant, and the frequency was significantly higher than in HBV genotype Ba over the entire follow-up period. In HBV genotype Ba, A1896 was found earlier than the T1762/A1764 mutant, and the frequency was significantly higher than in genotype C only before HBeAg seroconversion, and the A1896 mutant played an important role in HBeAg seroconversion in HBV genotype Ba. In addition, the T1846 variant was an independent factor associated with HBeAg seroconversion. Furthermore, HBV genotype C was associated with the development of G or C1753 and T1766/A1768 mutations, and the reactivation of hepatitis after HBeAg seroconversion. Based on Cox's regression analysis, the significant risk factors of liver cirrhosis were older age at entry [hazard ratio (HR)=1.085, 95% confidence interval (CI)=1.036-1.136, P=0.001], alanine transaminase (ALT) >80 U/l (HR=3.48, 95% CI=1.37-8.86, P=0.009), and the T1762/A1764 mutant (HR=5.54, 95% CI=2.18-14.08, P<0.001). CONCLUSIONS: Our study showed that different HBV genotypes were associated with various mutations in the core promoter and precore regions during HBeAg seroconversion. T1762/A1764 mutation could be useful in predicting clinical outcomes in HBeAg-positive patients with HBV infection.     

Role of hepatitis B virus base core and precore/core promoter mutations on hepatocellular carcinoma in untreated older genotype C Chinese patients

The aim of the study was to investigate the prevalence of mutations of basal core promoter (BCP) and precore (PreC) region of hepatitis B virus (HBV) and their association with hepatocellular carcinoma. A total of 341 untreated older HBV patients were divided into three groups: chronic hepatitis B (CHB, 185), cirrhotic hepatocellular carcinoma (LC-HCC, 113) and non-cirrhotic hepatocellular carcinoma (non-LC-HCC, 43). HBV BCP and PreC mutations and genotypes were determined by direct sequencing. Using univariate analysis, age (≥ 45 years), single mutations including A1896 and A1899 and multiple mutations T1762/A1764 + A1896, T1762/A1764 + A1899 and T1762/A1764 + A1896 + A1899 were more frequently detected in LC-HCC and non-LC-HCC patients than in CHB patients. BCP T1762/A1764 mutations were highly detected in LC-HCC patients than in CHB patients. Multivariate logistic regression analysis (adjusted for age and gender) revealed that among HBeAg-positive patients, BCP T1762/A1764 mutations (OR, 5.975; P = 0.05), PreC A1899 mutation (OR, 4.180; P = 0.013) and multiple mutations T1762/A1764 + A1899 (OR, 6.408; P = 0.006) were independently associated with the development of LC-HCC; PreC A1899 mutation (OR, 7.347; P = 0.034) was also independently associated with the development of non-LC-HCC. On the other hand, among HBeAg-negative patients, PreC A1896 mutation (OR, 5.176; P = 0.002) and multiple mutations T1762/A1764 + A1896 (OR, 4.149; P = 0.007) were independently associated with the development of non-LC-HCC. These results indicated that older age (≥ 45 years) was associated with LC-HCC and non-LC-HCC development. BCP T1762/A1764 mutations and PreC A1899 mutation were associated with the LC-HCC development in HBeAg-positive patients. PreC A1896 mutation was associated with the non-LC-HCC development in HBeAg-negative patients.     

25例乙肝患者HBV基因分型

对随机挑选的25例荧光定量PCR检测HBV-DNA阳性的乙肝患者,进行乙肝病毒（HBV）基因分型,并分析其与乙肝血清标记物及谷丙转氨酶之间的关系。结果检出HBV B型5例,占20.00%;C型16例,占64.00%;非B非C型4例,占16.00%。B型HBeAg阳性率为40.00%,C型HBeAg阳性率93.75%,B、C型谷丙转氨酶阳性率分别为20.00%和37.50%。结果表明,乙肝病人HBV感染以C型为主,且C型感染者HBeAg阳性率比B型感染者高。C型HBV可能与HBV复制有相关性。     

Clinical significance of precore and core promoter mutations in genotype D hepatitis B-related chronic liver disease

SUMMARY: The impact of mutations in the precore and basal core promoter (BCP) regions of the hepatitis B virus on the course of chronic liver disease is not well established. We sought to examine the relationship of these characteristics to the clinical expression of liver disease in patients infected with genotype D chronic hepatitis B (CHB). BCP and precore mutations in 110 patients with genotype D1 CHB were determined and correlated with clinical phenotype. Of 110 patients, 95 (86.5%) were HBeAg-negative. Compared with HBeAg-positive subjects, HBeAg-negative patients were over a decade older and had lower viral loads (3.70 +/- 0.98 vs 5.77 +/- 0.69 log copies/ml, P < 0.001). The double mutation A1762T-G1764A was more prevalent in patients with advanced liver disease (AdLD) and was associated with higher alanine aminotransferase and viral load. After adjusting for age, there was a more than fourfold increase in the risk of AdLD with this mutation (OR = 4.4; 95% CI: 1.13-16.92, P < 0.03). Conversely, the G1757A substitution was associated with protection, being 90% less frequent among patients with AdLD (P = 0.001). The results indicate that in genotype D CHB, the presence of the A1762T-G1764A mutation was associated with more aggressive liver disease while the G1757A substitution was associated with protection from advanced disease.