HBV 1762／1764联合突变的研究

目的探讨乙肝病毒C基因启动子区1 762/1764联合突变的临床意义.方法随机选择HBV DNA、HBeAg阳性和HBV DNA、HBeAg阴性的慢性乙型肝炎患者各50例.用实时荧光定量PCR法,对两组患者进行HBV 1 762/1764双变异及HBV DNA定量测定.结果HBV 1 762/1764变异阳性率在HBeAg阳性组为24.0%,在HBeAg阴性组为70.0%,两组比较差异有显著性意义(P＜0.01);HBV DNA含量,HBV 1 762/1764突变者显著高于HBV 1 762/1764未突变者(P＜0.01).结论HBV 1 762/1764联合突变可能抑制HBeAg表达和导致HBV复制增强.     

福州市乙肝病毒基因型和基因亚型的分布及其与前C、C基因启动子变异的关系

目的 研究福州市乙肝病毒基因型和亚型分布及其与T1762/A1764、A1896变异的关系,为完善预防、诊断、治疗病毒感染的策略和方法提供科学依据. 方法 应用型特异性引物PCR法检测HBsAg阳性血清的基因型,应用PCR-RFLP方法检测基因亚型、T1762/A1764变异和A1896变异. 结果 282份HBsAg阳性血清样品中103份未能成功分型,其余179份样品中B基因型122份(68.2%),C基因型54份(30.2%),B C型3份(1.7%),未检测到其他基因型.随机选取的100份B基因型样品中,Ba亚型71份(71.0%),Bj亚型8份(8.0%),未能分亚型者21份(21.0%).54份C基因型样品中Ce亚型 31份(57.4%),Cs亚型 14份(25.9%),Ce Cs 1份(1.9%),未能分亚型者8份(14.8%).T1762/A1764变异标本9份(8.7%),Ce亚型变异率最高(29.2%),Ba亚型次之(3.3%),Cs和Bj亚型未检测到变异株,T1762/A1764变异在不同基因型和亚型间的分布差异有统计学意义(P＜0.05).A1896变异标本10份(10.0%),Ba亚型变异率最高(14.0%),Cs亚型次之(10.0%),Ce亚型最低(4.0%),不同基因型和亚型中的变异差异无统计学意义(P＞0.05).HBeAg阳性和阴性样品中的基因型和亚型分布差异无统计学意义(P＞0.05). 结论 福州市乙肝病毒以B、C基因型为主,Ba、Ce亚型占优势,HBV各基因型和亚型发生T1762/A1764、A1896变异的模式不同.     

Aortic Insufficiency and Hemocompatibility-related Adverse Events in Patients with Left Ventricular Assist Devices

AimHemocompatibility-related adverse events (HRAE) are a major cause of readmissions in patients with left ventricular assist devices (LVAD). The impact of aortic insufficiency (AI) on HRAE remains uncertain. We aimed to investigate the impact of AI on HRAE.Methods and ResultsPatients who underwent LVAD implantation between August 2014 and July 2017 and had echocardiograms 3 months post-LVAD implantation were enrolled. AI severity was assessed by measuring the systolic/diastolic ratio of flow and the rate of diastolic flow acceleration using Doppler echocardiography of the outflow cannula. Regurgitation fraction was derived from these parameters. Significant AI was defined as regurgitation fraction > 30%. Among 105 patients (median age, 56 years; 76% male), 36 patients (34%) had significant AI. Baseline characteristics were statistically not significantly different between those with and without significant AI except for higher rates of ischemic etiology and atrial fibrillation in the significant AI group (P < 0.05 for both). One-year survival free from HRAE was 44% in patients with AI compared to 67% in patients without significant AI (P = 0.018). The average hemocompatibility score, which defines the net burden of HRAE, was higher in the AI group (1.72 vs 0.64; P = 0.009), due mostly to higher tier I (mild HRAE; P = 0.034) and tier IIIB scores (severe HRAE; P = 0.011).ConclusionSignificant AI, as assessed by Doppler echocardiographic parameters, was associated with HRAE during LVAD support.     

乙肝病毒A1762、G1764双突变是筛选男性HBsAg携带者肝癌最高危人群的生物学标记

目的 探讨乙肝病毒A1762、G1764双突变是否可作为筛选HBsAg携带者肝癌最高危人群的生物学标记.方法 对2 258名乙肝病毒无症状携带者进行前瞻性队列研究,其中HBV A1762、G1764双突变株组1 261人,野毒株组997人,跟踪随访队列,每6个月1次对观察对象抽血进行甲胎蛋白(AFP)检测及B超体检以检...     

A comparative study of hepatitis B virus X protein mutants K130M,V131I and KV130/131MI to investigate their roles in fibrosis,cirrhosis and hepatocellular carcinoma

Hepatitis B virus (HBV) genomic mutations A1762T, G1764A and AG1762/1764TA cause production of HBV X protein (HBx) mutants, namely K130M, V131I and KV130/131MI. These mutations are important biomarkers for the development of cirrhosis and hepatocellular carcinoma (HCC) in chronic HBV patients. This study comparatively analyses the impact of intracellular expression of HBx mutants on HCC cell line Huh7. It was found that expression of KV130/131MI induced: cell proliferation, altered expression of cell cycle regulatory genes in favour of cell proliferation, intracellular reactive oxygen species (ROS) production and mitochondrial depolarization. KV130/131MI may be directly involved in host cell proliferation and hepatocarcinogenesis via altering expression of cell cycle regulatory genes. KV130/131MI may also play pivotal roles in fibrosis and cirrhosis via inducing ROS production and mitochondrial depolarization. Furthermore, these might be the possible reasons for higher occurrence of AG1762/1764TA as compared to A1762T and G1764A in cirrhosis and HCC patients.     

Distribution of hepatitis B virus genotypes： Phylogenetic analysis and virological characteristics of Genotype C circulating among HBV carriers in Kolkata, Eastern India

INTRODUCTION Hepatitis B virus (HBV) belongs to the Hepadnaviridae family of enveloped viruses with double-stranded DNA genome of nearly 3200 bp lengths. The HBV genome consists of four major overlapping open reading frames named surface (S), core (C), po…     

Identification of hepatitis B virus A1762T/G1764A double mutant strain in patients in Southern Brazil

Infection by hepatitis B virus (HBV) is a worldwide public health problem. Chronic HBV infection with high viral replication may lead to cirrhosis and/or hepatocellular carcinoma. Mutant HBV strains, such as the HBV A1762T/G1764A double mutant, have been associated with poor prognosis and higher risk of the patient for developing cirrhosis and/or hepatocellular carcinoma. This study analyzed the presence of the HBV A1762T/G1764A double mutant in patients with chronic HBV and its association with clinical parameters such as viral load, aminotransferases, and HBV antigens. A total of 49 patients with chronic hepatitis B were included in the study, and the HBV A1762T/G1764A double mutant strain was detected in four samples (8.16%) by polymerase chain reaction followed by restriction fragment length analysis (PCR-RFLP). The viral load was not significantly different between patients with or without the double mutant strain (p = 0.43). On the other hand, carriers of the HBV A1762T/G1764A double mutant had higher levels of ALT (p = 0.0028), while AST levels did not differ between groups (p = 0.051). In this study, 75% of the samples with the HBV A1762T/G1764A double mutation were HBeAg negative and anti-HBe positive, reflecting seroconversion even though they still displayed high viral loads. Our study has shown that the HBV A1762T/G1764A double mutant strain circulates in Brazilian patients, and is associated with elevated levels of ALT and HBeAg seroconversion.     

HBV基本核心启动子区和前C区变异与肝病进展的关系

乙型肝炎病毒（HBV）感染是我国严重的卫生健康问题,目前大约有1．7亿慢性HBV感染者,约占世界慢性HBV感染者的一半。HBV基因组结构为部分环状双链DNA,全长约3．2kb,其核心启动子对于HBV的复制和形态构成发挥了关键性作用。     

Hotelling T^2检验与多元方差分析在通心络对心梗疗效中的应用

目的探讨通心络疗效分析的统计学方法,为开发中医新药提供实验研究的科学论据。方法采用Hotelling T^2检验、多元方差分析,分析处理通心络对心梗干预前后的测量资料。结果多元方差分析结果显示,通心络（TXL）与骨髓间充质干细胞（MSCs）两个因素对LVEF、ESV、Segments、Thickening、Defectarea 5个指标均有统计学意义（p〈0.05）,且其交互效应具有统计学意义（p〈0.05）。通心络与骨髓间充质干细胞对心梗干预的差异不具有统计学意义。结论 Hotelling T^2检验与多元方差分析用于检验通心络疗效是可行的,结果满意。提示研究者可充分利用多元分析方法为医学科研服务。     

Seasonal Variation in TP53 R249S-Mutated Serum DNA with Aflatoxin Exposure and Hepatitis B Virus Infection

Background: Chronic hepatitis B virus (HBV) infection and dietary aflatoxin B₁ (AFB₁) exposure are etiological factors for hepatocellular carcinoma (HCC) in countries with hot, humid climates. HCC often harbors a TP53 (tumor protein p53) mutation at codon 249 (R249S). In chronic carriers, 1762^T/1764^A mutations in the HBV X gene are associated with increased HCC risk. Both mutations have been detected in circulating cell-free DNA (CFDNA) from asymptomatic HBV carriers.Objective: We evaluated seasonal variation in R249S and HBV in relation to AFB₁ exposure.Methods: R249S was quantitated by mass spectrometry in CFDNA in a cross-sectional survey of 473 asymptomatic subjects (237 HBV carriers and 236 noncarriers) recruited in three villages in the Gambia over a 10-month period. 1762^T/1764^A HBV mutations were detected by quantitative polymerase chain reaction. In addition, the HBV S gene was sequenced in 99 subjects positive for HBV surface antigen (HBsAg).Results: We observed a seasonal variation of serum R249S levels. Positivity for R249S and average concentration were significantly higher in HBsAg-positive subjects surveyed during April–July (61%; 5,690 ± 11,300 R249S copies/mL serum) than in those surveyed October–March [32% and 480 ± 1,030 copies/mL serum (odds ratio = 3.59; 95% confidence interval: 2.05, 6.30; p < 0.001)]. Positivity for HBV e antigen (HBeAg) (a marker of HBV replication) and viral DNA load also varied seasonally, with 15–30% of subjects surveyed between April and June HBeAg positive, compared with < 10% surveyed during other months. We detected 1762^T/1764^A mutations in 8% of carriers, half of whom were positive for R249S. We found HBV genotype E in 95 of 99 HBsAg-positive subjects.Conclusion: R249S is detectable in CFDNA of asymptomatic subjects. Evidence of temporal and quantitative variations suggests an interaction among AFB₁ exposure, HBV positivity, and replication on TP53 mutation formation or persistence.