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Mani M, Srikanth P, Gnanskandan S, Vijayaraghavan S, Shanmuganathan S. Mutations in Hepatitis B virus polymerase gene/partial surface gene among Chronic HBV carriers as markers for anti-viral drug resistance and escape mutants. CANADIAN JOURNAL OF BIOTECHNOLOGY 2017. [DOI: 10.24870/cjb.2017-a85] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
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Koumbi L, Pollicino T, Raimondo G, Stampoulis D, Khakoo S, Karayiannis P. Hepatitis B virus basal core promoter mutations show lower replication fitness associated with cccDNA acetylation status. Virus Res 2016; 220:150-60. [PMID: 27132039 DOI: 10.1016/j.virusres.2016.04.022] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/01/2016] [Revised: 04/26/2016] [Accepted: 04/26/2016] [Indexed: 02/07/2023]
Abstract
In chronic hepatitis B virus (HBV) infection, variants with mutations in the basal core promoter (BCP) and precore region predominate and associate with more severe disease forms. Studies on their effect on viral replication remain controversial. Increasing evidence shows that epigenetic modifications of cccDNA regulate HBV replication and disease outcome. Here we determined the transcription and viral replication efficiency of well-defined BCP and precore mutations and their effect on cccDNA epigenetic control. HBV monomers bearing BCP mutations A1762T/G1764A and A1762T/G1764A/C1766T, and precore mutations G1896A, G1899A and G1896A/G1899A, were transfected into HepG2 cells using a plasmid-free approach. Viral RNA transcripts were detected by Northern blot hybridization and RT PCR, DNA replicative intermediates by Southern blotting and RT PCR, and viral release was measured by ELISA. Acetylation of cccDNA-bound histones was assessed by Chromatin ImmunoPrecipitation (ChIP) assay and methylation of cccDNA by bisulfite sequencing. BCP mutations resulted in low viral release, mRNA transcription and pgRNA/cccDNA ratios that paralleled the acetylation of cccDNA-bound H4 histone and inversely correlated with the HDAC1 recruitment onto cccDNA. Independently of the mutations, cccDNA was a target for methylation, accompanied by the upregulation of DNMT1 expression and DNMT1 recruitment onto cccDNA. Our results suggest that BCP mutations decrease viral replication capacity possibly by modulating the acetylation and deacetylation of cccDNA-bound histones while precore mutations do not have a significant effect on viral replication. These data provide evidence that epigenetic factors contribute to the regulation of HBV viral replication.
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Affiliation(s)
- Lemonica Koumbi
- Department of Medicine, Hepatology and Gastroenterology Section, Imperial College, St. Mary's Campus, London, UK.
| | - Teresa Pollicino
- Department of Pediatric, Gynecologic, Microbiologic, and Biomedical Sciences, University Hospital of Messina, Messina, Italy.
| | - Giovanni Raimondo
- Department of Clinical and Experimental Medicine, University Hospital of Messina, Messina, Italy.
| | | | - Salim Khakoo
- Henry Welcome Laboratories, Southampton General Hospital, Southampton, UK.
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Koumbi L, Pollicino T, Raimondo G, Kumar N, Karayiannis P, Khakoo SI. Hepatitis B viral replication influences the expression of natural killer cell ligands. Ann Gastroenterol 2016; 29:348-57. [PMID: 27366037 PMCID: PMC4923822 DOI: 10.20524/aog.2016.0036] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/27/2016] [Accepted: 03/28/2016] [Indexed: 12/11/2022] Open
Abstract
BACKGROUND Hepatitis B virus (HBV) is accounting for over one million deaths annually due to immune-mediated chronic liver damage. Natural killer (NK) cells are abundant in the liver and contribute in HBV persistence. NK cytotoxic effects are controlled by signals from activating and inhibitory receptors. HBV may circumvent host antiviral immunity via the regulation of NK receptors and their ligands. We investigated the effect of viral replication and HBeAg mutations on NK mediators expression in the livers of chronic HBV (CHB) patients and in cell cultures. METHODS HBV monomers bearing hotspot mutations in the basal core promoter and precore region were transfected into HepG2 cells using a plasmid-free assay. Serum viremia and liver HBV RNA were measured in 19 CHB patients. The expression of HBV RNA and of NKG2D ligands, B7H6, DNAX accessory molecule-1, lectin-like transcript 1 (LLT1), LFA-1 and TRAIL was measured in the livers of CHB patients and transfected cells. RESULTS In general, high HBV replication in CHB patients and cell lines upregulated the mRNA of all NK cell ligands and particularly the inhibitory NK cell ligand, LLT1. The exception was the NKG2D ligand, MICA, that was significantly decreased in patients with high serum viremia and intrahepatic HBV RNA levels. CONCLUSIONS HBV replication has differential effects on NK cell ligands suggesting a potential escape mechanisms through up-regulation of LLT1 and down-regulation of MICA. A general trend towards upregulating NK cell ligands can be counteracted by decreasing MICA and hence weakening NK surveillance.
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Affiliation(s)
- Lemonica Koumbi
- Department of Medicine, Hepatology and Gastroenterology Section, Imperial College, St. Mary's Campus, London, UK (Lemonia Koumbi, Naveenta Kumar)
| | - Teresa Pollicino
- Department of Pediatric, Gynecologic, Microbiologic, and Biomedical Sciences, University Hospital of Messina, Messina, Italy (Teresa Pollicino)
| | - Giovanni Raimondo
- Department of Clinical and Experimental Medicine, University Hospital of Messina, Messina, Italy (Giovanni Raimondo)
| | - Naveenta Kumar
- Department of Medicine, Hepatology and Gastroenterology Section, Imperial College, St. Mary's Campus, London, UK (Lemonia Koumbi, Naveenta Kumar)
| | - Peter Karayiannis
- University of Nicosia Medical School, Nicosia, Cyprus (Peter Karayiannis)
| | - Salim I Khakoo
- Henry Welcome Laboratories, Southampton General Hospital, Southampton, UK (Salim I. Khakoo)
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Park YM. Clinical utility of complex mutations in the core promoter and proximal precore regions of the hepatitis B virus genome. World J Hepatol 2015; 7:113-120. [PMID: 25625002 PMCID: PMC4295188 DOI: 10.4254/wjh.v7.i1.113] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/28/2014] [Revised: 10/12/2014] [Accepted: 10/29/2014] [Indexed: 02/06/2023] Open
Abstract
The core promoter and proximal precore regions are the most complex portions of the hepatitis B virus (HBV) genome. These regions cooperatively regulate viral replication and differentially regulate the synthesis of the viral proteins E, core, and X. Multiple mutations in these regions are associated with the persistency of viral infection and the development of cirrhosis and hepatocellular carcinoma (HCC). In South Korea, nearly all HBVs are classified as HBV genotype C2; the majority of these viruses have the basal core promoter double mutation, a precore stop mutation, or both. These mutations may play a role in the alteration of viral and clinical features, and abundant and complex mutations are particularly prevalent in the core promoter and proximal precore regions. We previously demonstrated that the accumulation of ≥ 6 mutations at eight key nucleotides located in these regions (G1613A, C1653T, T1753V, A1762T, G1764A, A1846T, G1896A, and G1899A) is a useful marker to predict the development of HCC regardless of advanced liver disease. In addition, certain mutation combinations were predominant in cases with ≥ 4 mutations. In cases with ≤ 5 mutations, a low Hepatitis B e antigen titer (< 35 signal to noise ratio) was indicative of HCC risk. Viral mutation data of the single HBV genotype C2 suggest that the combined effect of the number and pattern of mutations in the core promoter and proximal precore regions is helpful in predicting HCC risk.
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Rodriguez-Frias F, Buti M, Tabernero D, Homs M. Quasispecies structure, cornerstone of hepatitis B virus infection: Mass sequencing approach. World J Gastroenterol 2013; 19:6995-7023. [PMID: 24222943 PMCID: PMC3819535 DOI: 10.3748/wjg.v19.i41.6995] [Citation(s) in RCA: 30] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/28/2013] [Revised: 07/23/2013] [Accepted: 09/17/2013] [Indexed: 02/06/2023] Open
Abstract
Hepatitis B virus (HBV) is a DNA virus with complex replication, and high replication and mutation rates, leading to a heterogeneous viral population. The population is comprised of genomes that are closely related, but not identical; hence, HBV is considered a viral quasispecies. Quasispecies variability may be somewhat limited by the high degree of overlapping between the HBV coding regions, which is especially important in the P and S gene overlapping regions, but is less significant in the X and preCore/Core genes. Despite this restriction, several clinically and pathologically relevant variants have been characterized along the viral genome. Next-generation sequencing (NGS) approaches enable high-throughput analysis of thousands of clonally amplified regions and are powerful tools for characterizing genetic diversity in viral strains. In the present review, we update the information regarding HBV variability and present a summary of the various NGS approaches available for research in this virus. In addition, we provide an analysis of the clinical implications of HBV variants and their study by NGS.
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Sede M, Lopez-Ledesma M, Frider B, Pozzati M, Campos RH, Flichman D, Quarleri J. Hepatitis B virus depicts a high degree of conservation during the immune-tolerant phase in familiarly transmitted chronic hepatitis B infection: deep-sequencing and phylogenetic analysis. J Viral Hepat 2013; 21:650-61. [PMID: 25244642 DOI: 10.1111/jvh.12196] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/13/2013] [Accepted: 09/08/2013] [Indexed: 12/13/2022]
Abstract
When intrafamilial transmission of hepatitis B virus (HBV) occurs, a virus with the same characteristics interacts with diverse hosts' immune systems and may thus result in different mutations to escape immune pressure. In this study, the HBV genomic characterization was assessed longitudinally after intrafamilial transmission using nucleotide sequence data of phylogenetic and mutational analyses, including those obtained by deep-sequencing for the first time. Furthermore, HBeAg-anti-HBe profile and variability of HBV core-derived epitopes were also evaluated. Strong evidence was obtained from intrafamilial transmission of HBV genotype D1 by phylogenetic inferences. HBV isolates exhibited high degree (~99%) of genomic conservation for almost 20 years, when patients were persistently HBeAg positive with normal amino transferase levels. This identity remained high among immune-tolerant siblings. In contrast, it diminished significantly (P = 0.02) when the mother cleared HBeAg (immune clearance phase). By deep-sequencing, the quantitative analysis of the dynamics of basal core promoter (BCP) (A1762T, G1764A; A1766C; T1773C; 8-bp deletion; and other) and precore (G1896A) variants among HBV isolates from family members exhibited differences during the follow-up. However, only those from the mother showed amino acid variations at core protein that would impair their MHC-II binding. Hence, when intrafamilial transmission occurs, HBV was highly conserved under the immune-tolerant phase, but it exhibited mutations more frequently during the immune clearance phase. The analysis of the HBV BCP and precore mutants after intrafamilial HBV transmission contributes to a better understanding of how they evolve over time.
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Affiliation(s)
- M Sede
- Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET), Buenos Aires, Argentina; Instituto de Investigaciones Biomédicas en Retrovirus y Sida (INBIRS), Universidad de Buenos Aires, Buenos Aires, Argentina
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Lee IC, Huang YH, Su CW, Wang YJ, Huo TI, Lee KC, Lin HC. CXCL9 associated with sustained virological response in chronic hepatitis B patients receiving peginterferon alfa-2a therapy: a pilot study. PLoS One 2013; 8:e76798. [PMID: 24124595 PMCID: PMC3790882 DOI: 10.1371/journal.pone.0076798] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/19/2013] [Accepted: 08/28/2013] [Indexed: 12/22/2022] Open
Abstract
BACKGROUND AND AIMS There is lack of a practical biomarker to predict sustained virological response (SVR) in chronic hepatitis B (CHB) patients undergoing peginterferon alfa-2a (PEG-IFN). The aim of this pilot study was to identify immunological features associated with SVR. METHODS Consecutive 74 CHB patients receiving 24 weeks (for hepatitis B e antigen (HBeAg)-positive) or 48 weeks (for HBeAg-negative) PEG-IFN, were prospectively enrolled. Serum HBV viral loads, hepatitis B surface antigen (HBsAg), CXCL9, IFN-γ-inducible protein 10 (IP-10), interferon-gamma (IFN-γ) and transforming growth factor beta (TGF-β) were measured at baseline and week 12. SVR was defined as HBeAg seroconversion combined with viral load <2000 IU/mL in HBeAg-positive (n=36), and viral load <2000 IU/mL in HBeAg-negative patients (n=38) at 48 weeks after the end of treatment. RESULTS Nineteen patients (25.7%), 7 in HBeAg-positive and 12 in HBeAg-negative, achieved SVR. There were significant declines of HBV DNA, HBsAg, IP-10 and IFN-γ levels at week 12. In multivariate analysis, pre-treatment CXCL9 >80 pg/mL, HBV DNA <2.5 x 10(7) IU/mL and on-treatment HBV viral load, HBsAg decline >10% at week 12 were predictors of SVR. The performance of CXCL9 in predicting SVR was good in patients with HBV DNA <2.5 x 10(7) IU/mL, particularly in HBeAg-negative CHB cases (positive predictive value, PPV= 64.3%). CONCLUSIONS Pre-treatment CXCL9 level has the potential to select CHB patients who can respond to PEG-IFN, especially in HBeAg-negative patients with low viral loads.
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Affiliation(s)
- I-Cheng Lee
- Division of Gastroenterology, Department of Medicine, Taipei Veterans General Hospital, Taipei, Taiwan
- Institute of Clinical Medicine, National Yang-Ming University School of Medicine, Taipei, Taiwan
- Department of Medicine, National Yang-Ming University Hospital, I-Lan, Taiwan
| | - Yi-Hsiang Huang
- Division of Gastroenterology, Department of Medicine, Taipei Veterans General Hospital, Taipei, Taiwan
- Institute of Clinical Medicine, National Yang-Ming University School of Medicine, Taipei, Taiwan
| | - Chien-Wei Su
- Division of Gastroenterology, Department of Medicine, Taipei Veterans General Hospital, Taipei, Taiwan
- Institute of Clinical Medicine, National Yang-Ming University School of Medicine, Taipei, Taiwan
| | - Yuan-Jen Wang
- Health Care Center, Taipei Veterans General Hospital, Taipei, Taiwan
| | - Teh-Ia Huo
- Division of Gastroenterology, Department of Medicine, Taipei Veterans General Hospital, Taipei, Taiwan
- Institute of Pharmacology, National Yang-Ming University School of Medicine, Taipei, Taiwan
| | - Kuei-Chuan Lee
- Division of Gastroenterology, Department of Medicine, Taipei Veterans General Hospital, Taipei, Taiwan
- Institute of Clinical Medicine, National Yang-Ming University School of Medicine, Taipei, Taiwan
| | - Han-Chieh Lin
- Division of Gastroenterology, Department of Medicine, Taipei Veterans General Hospital, Taipei, Taiwan
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Lee IC, Lin CH, Huang YH, Huo TI, Su CW, Hou MC, Huang HC, Lee KC, Chan CC, Lin MW, Lin HC, Lee SD. IL28B polymorphism correlates with active hepatitis in patients with HBeAg-negative chronic hepatitis B. PLoS One 2013; 8:e58071. [PMID: 23469142 PMCID: PMC3585285 DOI: 10.1371/journal.pone.0058071] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/15/2012] [Accepted: 01/29/2013] [Indexed: 12/17/2022] Open
Abstract
BACKGROUND AIMS The clinical relevance of single nucleotide polymorphisms (SNPs) near the IL28B gene is controversial in patients with hepatitis B virus (HBV) infection. This study aimed to investigate the role of viral and host factors, including IL28B genotypes, in the natural course of chronic hepatitis B (CHB). METHODS The study enrolled consecutive 115 treatment-naive CHB patients. HBV viral loads, genotypes, precore and basal core promotor mutations, serum hepatitis B surface antigen (HBsAg) and interferon-gamma inducible protein 10 (IP-10) levels as well as four SNPs of IL28B were determined. Serial alanine transaminase (ALT) levels in the previous one year before enrollment at an interval of three months were recorded. Factors associated with active hepatitis, defined as persistent ALT >2× upper limit of normal (ULN) or a peak ALT level >5× ULN, were evaluated. RESULTS The prevalence of rs8105790 TT, rs12979860 CC, rs8099917 TT, and rs10853728 CC genotypes were 88.3%, 87.4%, 88.4% and 70.9%, respectively. In HBeAg-positive patients (n = 48), HBV viral load correlated with active hepatitis, while in HBeAg-negative patients (n = 67), rs10853728 CC genotype (p = 0.032) and a trend of higher IP-10 levels (p = 0.092) were associated with active hepatitis. In multivariate analysis, high viral load (HBV DNA >10(8) IU/mL, p = 0.042, odds ratio = 3.946) was significantly associated with HBeAg-positive hepatitis, whereas rs10853728 CC genotype (p = 0.019, odds ratio = 3.927) was the only independent factor associated with active hepatitis in HBeAg-negative population. CONCLUSIONS HBV viral load and IL28B rs10853728 CC genotype correlated with hepatitis activity in HBeAg-positive and HBeAg-negative CHB, respectively. Both viral and host factors play roles in disease activity during different phases of CHB.
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Affiliation(s)
- I-Cheng Lee
- Division of Gastroenterology, Department of Medicine, Taipei Veterans General Hospital, Taipei, Taiwan
- Institute of Clinical Medicine, National Yang-Ming University School of Medicine, Taipei, Taiwan
- Department of Medicine, National Yang-Ming University Hospital, I-Lan, Taiwan
| | - Chen-Hao Lin
- Division of Gastroenterology, Department of Medicine, Taipei Veterans General Hospital, Taipei, Taiwan
- Institute of Clinical Medicine, National Yang-Ming University School of Medicine, Taipei, Taiwan
| | - Yi-Hsiang Huang
- Division of Gastroenterology, Department of Medicine, Taipei Veterans General Hospital, Taipei, Taiwan
- Institute of Clinical Medicine, National Yang-Ming University School of Medicine, Taipei, Taiwan
| | - Teh-Ia Huo
- Division of Gastroenterology, Department of Medicine, Taipei Veterans General Hospital, Taipei, Taiwan
- Institute of Pharmacology, National Yang-Ming University School of Medicine, Taipei, Taiwan
| | - Chien-Wei Su
- Division of Gastroenterology, Department of Medicine, Taipei Veterans General Hospital, Taipei, Taiwan
- Institute of Clinical Medicine, National Yang-Ming University School of Medicine, Taipei, Taiwan
| | - Ming-Chih Hou
- Division of Gastroenterology, Department of Medicine, Taipei Veterans General Hospital, Taipei, Taiwan
- Endoscopy Center for Diagnosis and Treatment, Taipei Veterans General Hospital, Taipei, Taiwan
| | - Hui-Chun Huang
- Division of Gastroenterology, Department of Medicine, Taipei Veterans General Hospital, Taipei, Taiwan
| | - Kuei-Chuan Lee
- Division of Gastroenterology, Department of Medicine, Taipei Veterans General Hospital, Taipei, Taiwan
- Institute of Clinical Medicine, National Yang-Ming University School of Medicine, Taipei, Taiwan
| | - Che-Chang Chan
- Division of Gastroenterology, Department of Medicine, Taipei Veterans General Hospital, Taipei, Taiwan
- Institute of Clinical Medicine, National Yang-Ming University School of Medicine, Taipei, Taiwan
| | - Ming-Wei Lin
- Institute of Public Health, National Yang-Ming University School of Medicine, Taipei, Taiwan
| | - Han-Chieh Lin
- Division of Gastroenterology, Department of Medicine, Taipei Veterans General Hospital, Taipei, Taiwan
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Ghabeshi S, Sharifi Z, Hosseini SM, Mahmoodian Shooshtari M. Correlation between viral load of HBV in chronic hepatitis B patients and precore and Basal core promoter mutations. HEPATITIS MONTHLY 2013; 13:e7415. [PMID: 23599717 PMCID: PMC3628088 DOI: 10.5812/hepatmon.7415] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Subscribe] [Scholar Register] [Received: 07/24/2012] [Revised: 10/01/2012] [Accepted: 10/19/2012] [Indexed: 12/11/2022]
Abstract
BACKGROUND More than two billion people have been exposed to hepatitis B virus (HBV) worldwide. Furthermore, four hundred million of them are infected with chronic HBV infection. The predominant mutation of the precore region involves a G to A change at nucleotide1896, which creates a premature stop codon at codon 28. Two mutations of A1762T and G1764A are reported as the most prevalent mutations in the basal core promoter (BCP). OBJECTIVES The purpose of this study was to investigate the relationship between mutations in precore (PC) and basal core promoter regions, and the viral load. PATIENTS AND METHODS Fifty serum samples from patients with hepatitis B were used. Levels of liver enzymes alanine aminotransferase (ALT) and aspartate aminotransferase (AST) were measured at the same time of serological markers of hepatitis B by ELISA. HBV-DNA was extracted from the sera, and then PCR performed on the HBV-DNA extracted with the use of specific primer of gene C. HBV viral load was determined by real-time PCR. The PC/ BCP mutations were determined by applying Line Probe Assay technique. The data were analyzed using SPSS software, version 20. RESULTS Only 82% of the patients were HBeAb positive and 76% of the patients had basal core/ precore mutations and mean viral load was 3/7 × 106 ± 9/7 × 105 IU/ml. Prevalence of mutations in the precore and basal core promoter regions were 46% and 30%, respectively. CONCLUSIONS Our data indicated that there is a statistically significant relationship between HBV viral load and mutations in precore region (P < 0.05).
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Affiliation(s)
- Soad Ghabeshi
- Blood Transfusion Research Center, High Institute for Research and Education in Transfusion Medicine, Tehran, IR Iran
- Department of Microbiology, Faculty of Biological Sciences, Shahid Beheshti University, Tehran, IR Iran
| | - Zohreh Sharifi
- Blood Transfusion Research Center, High Institute for Research and Education in Transfusion Medicine, Tehran, IR Iran
- Corresponding author: Zohreh Sharifi, Blood Transfusion Research Center, High Institute for Research and Education in Transfusion Medicine, Tehran, IR Iran. Tel.: +98-2188601501-30, Fax: +98-2188601555, E-mail:
| | - Seyed Masoud Hosseini
- Department of Microbiology, Faculty of Biological Sciences, Shahid Beheshti University, Tehran, IR Iran
| | - Mahmood Mahmoodian Shooshtari
- Blood Transfusion Research Center, High Institute for Research and Education in Transfusion Medicine, Tehran, IR Iran
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Chauhan R, Sarin SK, Kumar M, Bhattacharjee J. Naturally occurring core immune-escape and carboxy-terminal mutations\truncations in patients with e antigen negative chronic hepatitis B. Hepatol Int 2012. [PMID: 26201521 DOI: 10.1007/s12072-011-9316-5] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
Abstract
INTRODUCTION Hepatocellular injury is often progressive in patients with hepatitis B e antigen negative chronic hepatitis B (HBeAg -ve CHB). There is scant data on association of core mutations occurring in patients with HBeAg -ve CHB with severity of liver disease. MATERIALS AND METHODS Hundred and eighteen patients with chronic infection who were HBeAg negative, anti-HBe, and HBV DNA positive were enrolled. Precore and core regions were amplified, sequenced, and analyzed for precore, T helper, cytotoxic T lymphocytes (CTLs), B-cell epitope, and core carboxy-terminal region mutations. RESULTS Majority of patients were infected with HBV genotype D: 96 (81%) [D1: 16, D2: 55 and D5: 25] followed by genotype A1: 15 (13%) and genotype C: 7 (6%) [C1: 5 and unidentified subgenotype C: 2]. Classical (A1896) as well as nonclassical precore region mutations were detected in 30 (25%) and in 9 (7.6%) patients, respectively. Core immune escape, core carboxy-terminal mutations and truncations were detected in 61 (52%), 11 (9.3%), and 14 (12%) patients, respectively. Three core immune escape mutations were significantly higher in patients with coexisting precore stop codon compared with patients without precore stop codon mutation, cT12S (43 vs. 8%, p < 0.001), cS21T (16 vs. 3.4%, p < 0.026), and cE77D (30 vs. 4.5%, p < 0.002). When frequency of core immune escape mutations was compared among CHB and decompensated patients, and cT12S: (27 vs. 10%, p < 0.05), cS21T (16 vs. 1.35%, p < 0.01), cT67P/N: (20 vs. 4%, p < 0.001), cE113D (11.37 vs. 1.35%, p < 0.05), and cP130T/Q (7 vs. 0%, p < 0.001) mutations were found to be significantly higher in decompensated patients. CONCLUSION Core immune-escape mutations cT12S, cS21T, cT67P, cE113D, and cP130T/Q are significantly higher in decompensated liver disease patients and could influence the severity of liver disease in HBeAg -ve CHB patients.
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Affiliation(s)
- Ranjit Chauhan
- Department of Gastroenterology and Advanced Centre for Liver Diseases, G.B. Pant Hospital, Room No. 201, New Delhi, 110002, India
- Department of Biochemistry, Lady Hardinge Medical College, New Delhi, 110002, India
| | - Shiv K Sarin
- Department of Gastroenterology and Advanced Centre for Liver Diseases, G.B. Pant Hospital, Room No. 201, New Delhi, 110002, India.
| | - Manoj Kumar
- Department of Gastroenterology and Advanced Centre for Liver Diseases, G.B. Pant Hospital, Room No. 201, New Delhi, 110002, India
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Yan CH, Zhao CY, Ding H, Peng YQ, Jin PY, Yan L, Zhuang H, Li T. Hepatitis B virus basal core promoter mutations A1762T/G1764A are associated with genotype C and a low serum HBsAg level in chronically-infected HBeAg-positive Chinese patients. Antiviral Res 2012; 96:108-14. [PMID: 22960603 DOI: 10.1016/j.antiviral.2012.08.009] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/09/2012] [Revised: 08/22/2012] [Accepted: 08/23/2012] [Indexed: 12/16/2022]
Abstract
The present study was aimed to obtain baseline information of basal core promoter A1762T/G1764A and precore G1896A mutations of hepatitis B virus (HBV) in 192 HBeAg-positive chronically-infected Chinese patients, who were potential candidates for antiviral treatment. The detection of these mutations (including minor mutant subpopulations) was achieved by direct sequencing, whose sensitivity for minor mutant subpopulations identification was confirmed by clone sequencing. Patients enrolled were infected with either genotype B (46.35%) or C (53.65%) HBV identified by routine tests in our laboratory. The A1762T/G1764A or G1896A mutations were detected in 125specimens (125/192, 65.10%), in which 77 (77/125, 61.60%) existed as subpopulations. The A1762T/G1764A mutations were found to be more prevalent in genotype C than that in genotype B HBV [62.14% (64/103) vs. 20.22% (18/89), P<0.0001]. There is no statistically significant link between G1896A and genotypes. The emergence of A1762T/G1764A mutations was also found to be associated with an older age, an elevated ALT/AST level, and a lower HBsAg level in serum [wild-type vs. mutant: 4.57 (3.46-5.42) vs. 3.93 (2.51-5.36), P<0.0001]. In conclusion, HBV basal core promoter mutations A1762T/G1764A are associated with genotype C and a low serum HBsAg level in chronically-infected HBeAg-positive Chinese patients.
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Affiliation(s)
- Chun-Hui Yan
- Department of Microbiology and Infectious Disease Center, School of Basic Medical Sciences, Peking University, 38 Xueyuan Road, Haidian District, Beijing 100191, PR China
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Lee IC, Huang YH, Chan CC, Huo TI, Chu CJ, Lai CR, Lee PC, Su CW, Wu JC, Lin HC, Lee SD. Impact of body mass index and viral load on liver histology in hepatitis B e antigen-negative chronic hepatitis B. Clin Nutr 2011; 30:647-52. [PMID: 21612848 DOI: 10.1016/j.clnu.2011.05.001] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/26/2010] [Revised: 04/20/2011] [Accepted: 05/02/2011] [Indexed: 01/05/2023]
Abstract
BACKGROUND & AIMS The impact of overweight and obesity on chronic hepatitis B (CHB) is unclear. This study was to examine the relationship among body mass index, viral load and liver histology in HBeAg-negative CHB. METHODS The study retrospectively investigated 136 HBeAg-negative chronic hepatitis B patients who had undergone liver biopsies in Taiwan. Factors associated with significant liver histology were analyzed. Definitions of overweight and obesity for the Asian population were body mass index≥23 kg/m(2) and ≥25 kg/m(2), respectively. RESULTS The prevalence of overweight, obesity, and type 2 diabetes mellitus in the 136 patients were 22.8%, 52.2%, and 12.5%, respectively. Multivariate analysis identified obesity, AST>40 U/L, HBV DNA>20,000IU/mL and platelet count<150 × 10(9)/L as independent factors associated with significant liver fibrosis. Similarly, overweight/obesity, ALT>80 U/L, HBV DNA>1,000,000IU/mL, and platelet count<150 × 10(9)/L were independent predictors of significant hepatic necro-inflammation. By stratification, high BMI and high viral load patients had more advanced stage and grade of liver histology. CONCLUSIONS Body mass index and HBV viral loads may have synergistic effect on disease progression in HBeAg-negative CHB. Both controlling body weight and anti-viral therapy are important in the management of CHB.
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Affiliation(s)
- I-Cheng Lee
- Institute of Clinical Medicine, National Yang-Ming University School of Medicine, Taipei, Taiwan
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Fan W, Huang L, Zhou Z, Li Y. A336C/A336T/T337C variations in HBV core gene and spontaneous hepatitis B e antigen loss in chronic hepatitis B patients. Virol J 2011; 8:226. [PMID: 21569538 PMCID: PMC3117842 DOI: 10.1186/1743-422x-8-226] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/06/2010] [Accepted: 05/14/2011] [Indexed: 12/26/2022] Open
Abstract
BACKGROUND A336C/A336T/T337C variations in HBV core gene were demonstrated to relate to the decreases in serum HBV DNA levels and HBV replication in chronic hepatitis B patients. Usually the drastic decrease in serum HBV DNA levels correlates with spontaneous HBeAg loss during the course of chronic HBV infection. The aim of the present study was to investigate whether there was correlation between A336C/A336T/T337C variations and spontaneous HBeAg loss METHODOLOGY/PRINCIPAL FINDINGS A modified PCR-RFLP assay and ELISA were adopted to determine A336C/A336T/T337C variations and serum HBeAg levels in chronic hepatitis B patients without any antiviral therapy, respectively, whereas G1896A variation and HBV genotype were detected using Taqman-PCR assay. RFLP pattern C, E, G, C/G mixture and a new pattern C' were found in this study. A336C/A336T/T337C variations occurred in 40/166(24.1%) chronic hepatitis B patients. Chi-square test showed that C336/T336/C337 variants was more frequent in chronic hepatitis B patients with A1896 variants than those with the wild type G1896 (χ2 = 4.7, P = 0.03), and moreover, patients with C336/T336/C337 variants had a significantly lower HBeAg-positive percentage than those with the wild type A336/T337. Binary logistic regression identified genotype B (OR = 4.1, 95%CI = 1.8-9.2, P = 0.001), the presence of C336/T336/C337 variants (OR = 3.2, 95%CI = 1.2-8.5, P = 0.02) and A1896 variants (OR = 7.8, 95%CI = 3.3-18.5, P < 0.001) as independent factors associated with spontaneous HBeAg loss. CONCLUSION/SIGNIFICANCE A336C/A336T/T337C were naturally occurring polymorphisms in HBV core gene, and moreover, the presence of C336/T336/C337 variants was first demonstrated to be an independent factor associating with spontaneous HBeAg loss in chronic hepatitis B patients.
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Affiliation(s)
- Wen Fan
- Laboratory Department, Union Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, China 430022
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Fung J, Seto WK, Lai CL, Yuen J, Wong DKH, Yuen MF. Profiles of HBV DNA in a large population of Chinese patients with chronic hepatitis B: implications for antiviral therapy. J Hepatol 2011; 54:195-200. [PMID: 21056499 DOI: 10.1016/j.jhep.2010.06.031] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/19/2010] [Revised: 06/06/2010] [Accepted: 06/30/2010] [Indexed: 12/29/2022]
Abstract
BACKGROUND & AIMS We determined the virological profile in Chinese chronic hepatitis B (CHB) subjects and its implications regarding current treatment guidelines. METHODS A total of 1400 treatment-naïve CHB patients had their HBV DNA levels determined using the Cobas Taqman assay. Patient demographics, HBeAg status, and liver biochemistry were also recorded. RESULTS The subjects were predominantly male (62%), had a median age of 45 years, and 301 (22%) were HBeAg-positive. In subjects aged ≤ 25, 26-35, 36-45, 46-55, and >55 years, there was a decreasing trend of HBV DNA levels of 9.9, 9.3, 8.2, 7.4, and 7.3 log copies/ml, respectively (p<0.001), in HBeAg-positive subjects, while the pattern was reversed with HBV DNA levels of 3.7, 4.4, 4.7, 4.9, and 5.2 log copies/ml, respectively, in HBeAg-negative subjects (p<0.001). In HBeAg-negative subjects, the proportion of patients with elevated ALT compared to those with normal ALT was significantly higher in older age groups (p<0.001). In our study population, by applying the AASLD, EASL, and APASL guidelines, 64%, 99%, and 64% would be eligible for antiviral therapy, respectively, in HBeAg-positive patients (with elevated ALT), and 38%, 72%, and 43%, respectively, in HBeAg-negative patients (with elevated ALT). Up to 54% of patients over the age of 40 years would be recommended for liver biopsy to determine further eligibility for treatment. CONCLUSIONS For HBeAg-negative CHB, more patients had elevated ALT and a higher viral load with increasing age. Close monitoring is recommended in this group so that treatment may be considered. By applying the current treatment guidelines, a wide discrepancy can be observed in the proportion of patients eligible for treatment in the absence of histological data.
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Affiliation(s)
- James Fung
- Department of Medicine, The University of Hong Kong, Queen Mary Hospital, Hong Kong SAR, Hong Kong
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Zhang D, Ma S, Zhang X, Zhao H, Ding H, Zeng C. Prevalent HBV point mutations and mutation combinations at BCP/preC region and their association with liver disease progression. BMC Infect Dis 2010; 10:271. [PMID: 20846420 PMCID: PMC2949759 DOI: 10.1186/1471-2334-10-271] [Citation(s) in RCA: 30] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/17/2010] [Accepted: 09/16/2010] [Indexed: 02/07/2023] Open
Abstract
Background Mutations in the basic core promoter (BCP) and its adjacent precore (preC) region in HBV genome are common in chronic hepatitis B patients. However, the patterns of mutation combinations in these two regions during chronic infection are less understood. This study focused on single base mutations in BCP and preC region and the multi-mutation patterns observed in chronic HBV infection patients. Methods Total 192 blood samples of chronic HBV infection patients were included. Direct PCR sequencing on the target region of HBV genome was successfully conducted in 157 samples. The rest 35 samples were analyzed by clone sequencing. Only the nucleotide substitutions with their frequencies no less than 10% were included in multi-mutation analysis with the exception for the polymorphic sites between genotypes B and C. Results Five high frequency mutations (≥10%) were found in BCP and preC region. Thirteen types of multi-mutations in one fragment were observed, among which 3 types were common combinations (≥5%). The top three multi-mutations were A1762T/G1764A (36%), A1762T/G1764A/G1896A (11%) and T1753(A/C)/A1762T/G1764A/G1896A (8%). Patients with multi-mutations in viral genomes (≥3) were more likely to have liver cirrhosis or hepatocellular carcinoma (OR = 3.1, 95% CI: 1.6-6.0, P = 0.001). G1896A mutation seemed to be involved in liver disease progression independent of the patient age (OR = 3.6, 95% CI: 1.5-8.6; P = 0.004). In addition, patients with more viral mutations detected (≥3) were more likely to be HBeAg negative (OR = 2.7, 95% CI: 1.1-6.4; P = 0.027). Moreover, G1776A mutation was shown to contribute to HBeAg negativity in our study (OR = 8.6, 95% CI: 1.2-44.9; P = 0.01). Conclusions Patients with advanced liver diseases and with HBeAg negativity more likely have multi-mutations in HBV genomes but with different mutation combination patterns. G1896A mutation appears to be independent of infection history.
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Affiliation(s)
- Dake Zhang
- Beijing Institute of Genomics, Key Laboratory of Genome Sciences and Information, Chinese Academy of Sciences, Beijing 100029, China
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Lee IC, Huang YH, Chan CC, Huo TI, Chu CJ, Lai CR, Lee PC, Su CW, Hung HH, Wu JC, Lin HC, Lee SD. Correlation between clinical indication for treatment and liver histology in HBeAg-negative chronic hepatitis B: a novel role of alpha-fetoprotein. Liver Int 2010; 30:1161-8. [PMID: 20557454 DOI: 10.1111/j.1478-3231.2010.02301.x] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 02/13/2023]
Abstract
BACKGROUND It is unclear whether clinical indication for antiviral treatment is in agreement with histological indication in HBeAg-negative chronic hepatitis B (CHB). This study aimed to clarify this relationship and identify factors associated with liver histology. PATIENTS AND METHODS We investigated 152 consecutive, treatment-naïve, HBeAg-negative CHB patients who had undergone liver biopsies at a tertiary medical centre in Taiwan. Clinical indications for treatment included a serum alanine aminotransferase level more than twice the upper limit of normal and an hepatitis B virus DNA level > 2000 IU/ml. Factors associated with the histological indication (Ishak's grade > or = 7 and/or stage > or = 2) were analysed. RESULTS The association between the clinical and the histological indications was significant (P=0.011). However, the agreement was poor (kappa value=0.197). In patients satisfying the clinical indication, age > 52 years [odds ratio (OR)=2.669, P=0.042], serum alpha-fetoprotein (AFP) level > 7 ng/ml (OR=7.070, P<0.001) and platelet count < 130 x 10(9)/L (OR=11.720, P=0.025) were identified to be independent factors associated with histological indication. In patients who did not satisfy the clinical indication, multivariate analysis revealed that only an AFP level > 7 ng/ml (OR=10.345, P=0.021) was independently associated with histological indication. Combining the clinical indication and/or AFP level > 7 ng/ml to predict liver histology, the sensitivity and the negative predictive value could improve from 86 to 94.4% and 66.7 to 81% respectively. CONCLUSION AFP level is associated with liver histology in HBeAg-negative CHB. Serum AFP level can serve as a surrogate indicator to identify patients who need antiviral treatment.
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Affiliation(s)
- I-Cheng Lee
- Department of Medicine, Division of Gastroenterology, Taipei Veterans General Hospital, Taipei, Taiwan
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Wu JC, Huang YH, Chau GY, Su CW, Lai CR, Lee PC, Huo TI, Sheen IJ, Lee SD, Lui WY. Risk factors for early and late recurrence in hepatitis B-related hepatocellular carcinoma. J Hepatol 2009; 51:890-7. [PMID: 19747749 DOI: 10.1016/j.jhep.2009.07.009] [Citation(s) in RCA: 332] [Impact Index Per Article: 22.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/28/2009] [Revised: 07/01/2009] [Accepted: 07/02/2009] [Indexed: 02/09/2023]
Abstract
BACKGROUND/AIMS Hepatitis B virus (HBV) levels correlate with the development of hepatocellular carcinoma (HCC), but the role of viral load in HCC recurrence after tumor resection remains unclear. Herein we aimed to investigate the role of viral load in HCC recurrence following tumor resection. METHODS From 1990 to 2002, 193 HBV-related HCC patients who underwent tumor resection in Taipei Veterans General Hospital were enrolled. Serum HBV DNA level and mutations were analyzed for association with early and late recurrence, together with other clinical variables. RESULTS During a follow-up of 58.2+/-44 months, 134 patients had HCC recurrence. Multivariate analysis showed that multinodularity (Hazard ratio [HR], 95% confidence interval [CI]; 2.232, 1.021-4.878), macroscopic venous invasion (4.693, 1.645-13.391), AFP >20 ng/ml (3.891, 1.795-8.475), and cut margin <or= 1cm (3.333, 1.487-7.470) were correlated with early recurrence (within two years of operation) of HCC. In addition, multivariate analysis determined that Ishak hepatic inflammatory activity >6 (4.658, 1.970-11.017), multinodularity (3.266, 1.417-7.526), ICG-15 >10% (2.487, 1.095-5.650) and HBV DNA level >10(6) copies/ml (2.548, 1.040-6.240) were significantly associated with late recurrence (>two years after resection). Patients with high viral loads tended to have higher Ishak inflammatory (7.00+/-3.07 vs. 5.33+/-2.96, p=0.001) and fibrosis scores (4.17+/-2.01 vs. 3.20+/-2.41, p=0.007) than those with lower loads. CONCLUSIONS Tumor factors were associated with early HCC recurrence while high viral loads and hepatic inflammatory activity were associated with late recurrence. Pre- and post-operative antiviral and anti-inflammatory therapies may be crucial in reducing late recurrence.
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Affiliation(s)
- Jaw-Ching Wu
- Department of Medical Research and Education, Taipei Veterans General Hospital, Institute of Clinical Medicine, National Yang-Ming University School of Medicine, Taipei, Taiwan.
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de Oliveira PR, Yamamoto AY, de Souza CBS, de Araújo NM, de Andrade Gomes S, Heck AR, de Castro Figueiredo JF, Mussi-Pinhata MM. Hepatitis B viral markers in banked human milk before and after Holder pasteurization. J Clin Virol 2009; 45:281-4. [PMID: 19473876 DOI: 10.1016/j.jcv.2009.04.003] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/29/2008] [Revised: 04/14/2009] [Accepted: 04/19/2009] [Indexed: 01/02/2023]
Abstract
BACKGROUND Blood screening for hepatitis B virus (HBV) is not universally performed for donor selection in human milk banks. OBJECTIVES To evaluate the frequency of detection of HBV surface antigen (HBsAg) and HBV-DNA in colostrum of HBV-infected nursing mothers before and after Holder pasteurization. STUDY DESIGN Forty-two concentrated breast milk samples were obtained within two postnatal weeks from 24 HBsAg-positive women (4 HBeAg-positive and 20 HBeAg-negative, anti-HBe-positive) were tested for the presence of HBsAg and HBV-DNA before and after Holder pasteurization (30min at 62.5 degrees C). RESULTS Before pasteurization, HBsAg and HBV-DNA were found in 14/24 (58%), and 20/24 (75%) first milk samples, respectively, obtained by 4 days after delivery. At least one marker was detected in 20/24 (83%) milk samples. Both markers were identified in milk of HBeAg-positive mothers, and most mothers with anti-HBe in blood had at least one HBV marker. Once detected, viral markers were frequently found in milk samples subsequently obtained from the same woman. Holder pasteurization did not affect the probability of detecting HBsAg (8/18, 44%), HBV-DNA (12/18, 67%), or at least one of them (15/18, 83%). CONCLUSIONS Although the biological implications of these findings remain to be determined, considering that HBV is highly contagious and most recipients of banked human milk are preterm infants, these findings should be taken into account when donors are enlisted for human milk banks without serological screening.
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Affiliation(s)
- Patricia Ribeiro de Oliveira
- Department of Pediatrics, Faculty of Medicine of Ribeirão Preto, University of São Paulo, Av. Bandeirantes 3900, 14049-900, Ribeirão Preto, SP, Brazil.
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The association of HBV core promoter double mutations (A1762T and G1764A) with viral load differs between HBeAg positive and anti-HBe positive individuals: a longitudinal analysis. J Hepatol 2009; 50:273-80. [PMID: 19070921 PMCID: PMC2648871 DOI: 10.1016/j.jhep.2008.09.014] [Citation(s) in RCA: 45] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/31/2008] [Revised: 09/16/2008] [Accepted: 09/17/2008] [Indexed: 12/12/2022]
Abstract
BACKGROUND/AIMS Although there have been a few reports regarding the effect of basal core promoter (BCP) double mutations (A1762T and G1764A) on hepatitis B viral loads, the association remains uncertain. We aim to determine the association after controlling for HBeAg - a strong confounding factor. METHODS We selected randomly 190 individuals from a Chinese cohort of 2258 subjects for cross-sectional analysis and 56 of the 190 for longitudinal analysis of viral loads. RESULTS In multivariable analysis of the cross-sectional data, BCP double mutations are significantly associated with lower viral loads in HBeAg positive subjects but no difference was found in anti-HBe positive subjects. Triple mutations at nucleotide (nt) 1753, 1762 and 1764 and mutations between nt 1809 and 1817, precore stop mutation (nt 1896) and genotype are not associated with viral loads in either HBeAg or anti-HBe positive subjects. Analysis of the longitudinal data yielded similar results to the cross-sectional data. Viral loads differ significantly between individuals infected with wild-type and BCP double mutations prior to HBeAg seroconversion but this difference is lost after seroconversion. CONCLUSIONS BCP double mutations are associated with lower viral loads in HBeAg positive individuals but have no effect on the viral loads of anti-HBe positive individuals.
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Li Y, Wang X, Chen F, Ma R, Wen X, Hu L. Clinical significance of a set of single nucleotide polymorphisms of hepatitis B virus core gene in Chinese Han patients with chronic hepatitis B. J Med Virol 2008; 80:1885-1890. [DOI: 10.1002/jmv.21301] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 08/29/2023]
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Guo X, Jin Y, Qian G, Tu H. Sequential accumulation of the mutations in core promoter of hepatitis B virus is associated with the development of hepatocellular carcinoma in Qidong, China. J Hepatol 2008; 49:718-25. [PMID: 18801591 DOI: 10.1016/j.jhep.2008.06.026] [Citation(s) in RCA: 71] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/22/2008] [Revised: 06/04/2008] [Accepted: 06/10/2008] [Indexed: 12/26/2022]
Abstract
BACKGROUND/AIMS To investigate the mutations in hepatitis B virus (HBV) that might be related to hepatocellular carcinoma (HCC) in the high-risk area Qidong, China. METHODS DNA sequences of HBV basal core promoter (BCP) and the overlapping X gene were determined in 58 HCC and 71 chronic hepatitis (CH) patients. In addition, a consecutive series of plasma samples from 15 HCC cases were employed to compare the CP/X sequences before and after the occurrence of HCC. RESULTS T1762/A1764 double mutation was frequently found in Qidong patients, regardless of clinical status (65.5% in HCC and 73.2% in CH, P>0.05). Unexpectedly, the adjacent T1766/A1768 mutation significantly increased the risk of HCC (P<0.05). Moreover, the prevalence of triple mutations in BCP was significantly higher in patients with HCC than those with CH (P<0.05). The longitudinal study demonstrated that the mutations in BCP were gradually accumulated during the development of HCC. Colony formation assay showed while A1764 mutation alone did not alter the colony-inhibitory activity of HBx, double or triple mutations largely abrogated this effect. CONCLUSIONS The complex mutation involving T1766/A1768 was closely related to HCC. The enhanced risk of HCC caused by BCP variants could be attributable partially to the aberrant activity of HBx.
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Affiliation(s)
- Xia Guo
- National Laboratory of Oncogene and Related Genes, Cancer Institute of Shanghai Jiao-Tong University, School of Medicine, Shanghai 200032, China
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Shen T, Yan XM, Zou YL, Gao JM, Dong H. Virologic characteristics of hepatitis B virus in patients infected via maternal-fetal transmission. World J Gastroenterol 2008; 14:5674-82. [PMID: 18837083 PMCID: PMC2748201 DOI: 10.3748/wjg.14.5674] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 02/06/2023] Open
Abstract
AIM: To determine whether HBV with the same characteristics causes dissimilar mutations in different hosts.
METHODS: Full-length HBV genome was amplified and linked with pMD T18 vector. Positive clones were selected by double-restriction endonuclease digestion (EcoRI and HindIII) and PCR. Twenty seven clones were randomly selected from an asymptomatic mother [at two time points: 602 (1 d) and 6022 (6 mo)] and her son [602 (S)], and the phylogenetic and mutational analysis was performed using BioEditor, Clustal X and MEGA software. Potential immune epitopes were determined by the Stabilized Matrix Method (SMM), SMM-Align Method and Emini Surface Accessibility Prediction.
RESULTS: All of the 27 sequences were genotype C, the divergence between the mother and son was 0%-0.8%. Compared with another 50 complete sequences of genotype C, the mother and her son each had 13 specific nucleotides that differed from the other genotype C isolates. AA 1-11 deletion in preS1 was the dominant mutation in the mother (14/18). The 1762T/1764A double mutation existed in all clones of the mother, 3 of them were also coupled with G1896A mutation, but none were found in the son. 17 bp deletion starting at nucleotide 2330 was the major mutation (5/9) in the son, which caused seven potential HLA class I epitopes and one B cell epitope deletion, and produced a presumptive new start codon, downstream from the original one of the P gene.
CONCLUSION: The HBV strain in the son came from his mother, and discrepant mutation occurred in the mother and her son during infection.
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