1 3401 69 HOW DID HEPATITIS B VIRUS EFFECT THE HOST GENOME IN THE LAST DECADE? THE PRINCIPAL REASON OF CHRONIC LIVER DISEASE, CIRRHOSIS AND HEPATOCELLULAR CARCINOMA IS CHRONIC VIRAL HEPATITIS ALL OVER THE WORLD. HEPATITIS B VIRUS (HBV) HAS SOME MUTAGENIC EFFECTS ON THE HOST GENOME. HBV MAY BE EXHIBITING THESE MUTAGENIC EFFECTS THROUGH INTEGRATING INTO THE HOST GENOME, THROUGH ITS VIRAL PROTEINS OR THROUGH SOME EPIGENETIC MECHANISMS RELATED WITH HBV PROTEINS. THIS REVIEW AIMS TO SUMMARIZE THE MOLECULAR MECHANISMS USED BY HBV FOR EFFECTING HOST GENOME DETERMINED IN THE LAST DECADE. THE FOCUS WILL BE ON THE EFFECTS OF INTEGRATION, HBV PROTEINS, ESPECIALLY HBV X PROTEIN AND EPIGENETIC MECHANISMS ON THE HOST GENOME. THESE INTERACTIONS BETWEEN HBV AND THE HOST GENOME ALSO FORMS THE UNDERLYING MECHANISMS OF THE EVOLUTION OF HEPATOCELLULAR CARCINOMA. 2014 2 6016 31 THE ASSOCIATION BETWEEN HEPATOCARCINOGENESIS AND INTRACELLULAR ALTERATIONS DUE TO HEPATITIS B VIRUS INFECTION. CHRONIC HEPATITIS B VIRUS (HBV) INFECTION IS A WORLDWIDE HEALTH PROBLEM LEADING TO SEVERE LIVER DYSFUNCTION, INCLUDING LIVER CIRRHOSIS AND HEPATOCELLULAR CARCINOMA. ALTHOUGH CURRENT ANTIVIRAL THERAPIES FOR CHRONIC HBV INFECTION HAVE BEEN IMPROVED AND CAN LEAD TO A STRONG SUPPRESSION OF VIRAL REPLICATION, IT IS DIFFICULT TO COMPLETELY ELIMINATE THE VIRUS WITH THESE THERAPIES ONCE CHRONIC HBV INFECTION IS ESTABLISHED IN THE HOST. FURTHERMORE, CHRONIC HBV INFECTION ALTERS INTRACELLULAR METABOLISM AND SIGNALLING PATHWAYS, RESULTING IN THE ACTIVATION OF CARCINOGENESIS IN THE LIVER. HBV PRODUCES FOUR VIRAL PROTEINS: HEPATITIS B SURFACE-, HEPATITIS B CORE-, HEPATITIS B X PROTEIN, AND POLYMERASE; EACH PLAYS AN IMPORTANT ROLE IN HBV REPLICATION AND THE INTRACELLULAR SIGNALLING PATHWAYS ASSOCIATED WITH HEPATOCARCINOGENESIS. IN VITRO AND IN VIVO EXPERIMENTAL MODELS FOR ANALYZING HBV INFECTION AND REPLICATION HAVE BEEN ESTABLISHED, AND GENE EXPRESSION ANALYSES USING MICROARRAYS OR NEXT-GENERATION SEQUENCING HAVE ALSO BEEN DEVELOPED. THUS, IT IS POSSIBLE TO CLARIFY THE MOLECULAR MECHANISMS FOR INTRACELLULAR ALTERATIONS, SUCH AS ENDOPLASMIC RETICULUM STRESS, OXIDATIVE STRESS, AND EPIGENETIC MODIFICATIONS. IN THIS REVIEW, THE IMPACT OF HBV VIRAL PROTEINS AND INTRACELLULAR ALTERATIONS IN HBV-ASSOCIATED HEPATOCARCINOGENESIS ARE DISCUSSED. 2021 3 3394 29 HOST EPIGENETIC ALTERATIONS AND HEPATITIS B VIRUS-ASSOCIATED HEPATOCELLULAR CARCINOMA. HEPATOCELLULAR CARCINOMA (HCC) IS THE MOST FREQUENT PRIMARY MALIGNANCY OF THE LIVER AND A LEADING CAUSE OF CANCER-RELATED DEATHS WORLDWIDE. ALTHOUGH MUCH PROGRESS HAS BEEN MADE IN HCC DRUG DEVELOPMENT IN RECENT YEARS, TREATMENT OPTIONS REMAIN LIMITED. THE MAJOR CAUSE OF HCC IS CHRONIC HEPATITIS B VIRUS (HBV) INFECTION. DESPITE THE EXISTENCE OF A VACCINE, MORE THAN 250 MILLION INDIVIDUALS ARE CHRONICALLY INFECTED BY HBV. CURRENT ANTIVIRAL THERAPIES CAN REPRESS VIRAL REPLICATION BUT TO DATE THERE IS NO CURE FOR CHRONIC HEPATITIS B. OF NOTE, INHIBITION OF VIRAL REPLICATION REDUCES BUT DOES NOT ELIMINATE THE RISK OF HCC DEVELOPMENT. HBV CONTRIBUTES TO LIVER CARCINOGENESIS BY DIRECT AND INDIRECT EFFECTS. THIS REVIEW SUMMARIZES THE CURRENT KNOWLEDGE OF HBV-INDUCED HOST EPIGENETIC ALTERATIONS AND THEIR ASSOCIATION WITH HCC, WITH AN EMPHASIS ON THE INTERACTIONS BETWEEN HBV PROTEINS AND THE HOST CELL EPIGENETIC MACHINERY LEADING TO MODULATION OF GENE EXPRESSION. 2021 4 4133 24 MECHANISMS OF HEPATITIS B VIRUS-INDUCED HEPATOCARCINOGENESIS. HEPATITIS B VIRUS (HBV) IS A MAJOR CAUSE OF HEPATOCELLULAR CARCINOMA (HCC). THERE ARE APPROXIMATELY 250 MILLION PEOPLE IN THE WORLD THAT ARE CHRONICALLY INFECTED BY THIS VIRUS, RESULTING IN NEARLY 1 MILLION DEATHS EVERY YEAR. MANY OF THESE PATIENTS DIE FROM SEVERE LIVER DISEASES, INCLUDING HCC. HBV MAY INDUCE HCC THROUGH THE INDUCTION OF CHRONIC LIVER INFLAMMATION, WHICH CAN CAUSE OXIDATIVE STRESS AND DNA DAMAGE. HOWEVER, MANY STUDIES ALSO INDICATED THAT HBV COULD INDUCE HCC VIA THE ALTERATION OF HEPATOCELLULAR PHYSIOLOGY THAT MAY INVOLVE GENETIC AND EPIGENETIC CHANGES OF THE HOST DNA, THE ALTERATION OF CELLULAR SIGNALING PATHWAYS, AND THE INHIBITION OF DNA REPAIR MECHANISMS. THIS ALTERATION OF CELLULAR PHYSIOLOGY CAN LEAD TO THE ACCUMULATION OF DNA DAMAGES AND THE PROMOTION OF CELL CYCLES AND PREDISPOSE HEPATOCYTES TO ONCOGENIC TRANSFORMATION. 2021 5 4127 37 MECHANISMS OF DNA METHYLATION IN VIRUS-HOST INTERACTION IN HEPATITIS B INFECTION: PATHOGENESIS AND ONCOGENETIC PROPERTIES. HEPATITIS B VIRUS (HBV), THE WELL-STUDIED ONCOVIRUS THAT CONTRIBUTES TO THE MAJORITY OF HEPATOCELLULAR CARCINOMAS (HCC) WORLDWIDE, CAN CAUSE A SEVERE INFLAMMATORY MICROENVIRONMENT LEADING TO GENETIC AND EPIGENETIC CHANGES IN HEPATOCYTE CLONES. HBV REPLICATION CONTRIBUTES TO THE REGULATION OF DNA METHYLTRANSFERASE GENE EXPRESSION, PARTICULARLY BY X PROTEIN (HBX), AND SUBSEQUENT METHYLATION CHANGES MAY LEAD TO ABNORMAL TRANSCRIPTION ACTIVATION OF ADJACENT GENES AND GENOMIC INSTABILITY. UNDOUBTEDLY, THE ALTERED EXPRESSION OF THESE GENES HAS BEEN KNOWN TO CAUSE DIVERSE ASPECTS OF INFECTED HEPATOCYTES, INCLUDING APOPTOSIS, PROLIFERATION, REACTIVE OXYGEN SPECIES (ROS) ACCUMULATION, AND IMMUNE RESPONSES. ADDITIONALLY, POLLUTANT-INDUCED DNA METHYLATION CHANGES AND ABERRANT METHYLATION OF IMPRINTED GENES IN HEPATOCYTES ALSO COMPLICATE THE PROCESS OF TUMORIGENESIS. MEANWHILE, HEPATOCYTES ALSO CONTRIBUTE TO EPIGENETIC MODIFICATION OF THE VIRAL GENOME TO AFFECT HBV REPLICATION OR VIRAL PROTEIN PRODUCTION. MEANWHILE, METHYLATION LEVELS OF HBV INTEGRANTS AND SURROUNDING HOST REGIONS ALSO PLAY CRUCIAL ROLES IN THEIR ABILITY TO PRODUCE VIRAL PROTEINS IN AFFECTED HEPATOCYTES. BOTH HOST AND VIRAL CHANGES CAN PROVIDE NOVEL INSIGHTS INTO TUMORIGENESIS, INDIVIDUALIZED RESPONSES TO THERAPEUTIC INTERVENTION, DISEASE PROGRESS, AND EARLY DIAGNOSIS. AS SUCH, DNA METHYLATION-MEDIATED EPIGENETIC SILENCING OF CANCER-RELATED GENES AND VIRAL REPLICATION IS A COMPELLING THERAPEUTIC GOAL TO REDUCE MORBIDITY AND MORTALITY FROM LIVER CANCER CAUSED BY CHRONIC HBV INFECTION. IN THIS REVIEW, WE SUMMARIZE THE MOST RECENT RESEARCH ON ABERRANT DNA METHYLATION ASSOCIATED WITH HBV INFECTION, WHICH IS INVOLVED IN HCC DEVELOPMENT, AND PROVIDE AN OUTLOOK ON THE FUTURE DIRECTION OF THE RESEARCH. 2021 6 6271 32 THE ONCOGENIC ROLE OF HEPATITIS B VIRUS. THE HEPATITIS B VIRUS (HBV) IS A SMALL ENVELOPED DNA VIRUS THAT CAUSES ACUTE AND CHRONIC HEPATITIS. HBV INFECTION IS A WORLD HEALTH PROBLEM, WITH 350 MILLION CHRONICALLY INFECTED PEOPLE AT INCREASED RISK OF DEVELOPING LIVER DISEASE AND HEPATOCELLULAR CARCINOMA (HCC). HBV HAS BEEN CLASSIFIED AMONG HUMAN TUMOR VIRUSES BY VIRTUE OF A ROBUST EPIDEMIOLOGIC ASSOCIATION BETWEEN CHRONIC HBV CARRIAGE AND HCC OCCURRENCE. IN THE ABSENCE OF CYTOPATHIC EFFECT IN INFECTED HEPATOCYTES, THE ONCOGENIC ROLE OF HBV MIGHT INVOLVE A COMBINATION OF DIRECT AND INDIRECT EFFECTS OF THE VIRUS DURING THE MULTISTEP PROCESS OF LIVER CARCINOGENESIS. LIVER INFLAMMATION AND HEPATOCYTE PROLIFERATION DRIVEN BY HOST IMMUNE RESPONSES ARE RECOGNIZED DRIVING FORCES OF LIVER CELL TRANSFORMATION. GENETIC AND EPIGENETIC ALTERATIONS CAN ALSO RESULT FROM VIRAL DNA INTEGRATION INTO HOST CHROMOSOMES AND FROM PROLONGED EXPRESSION OF VIRAL GENE PRODUCTS. NOTABLY, THE TRANSCRIPTIONAL REGULATORY PROTEIN HBX ENCODED BY THE X GENE IS ENDOWED WITH TUMOR PROMOTER ACTIVITY. HBX HAS PLEIOTROPIC ACTIVITIES AND PLAYS A MAJOR ROLE IN HBV PATHOGENESIS AND IN LIVER CARCINOGENESIS. BECAUSE HEPATIC TUMORS CARRY A DISMAL PROGNOSIS, THERE IS URGENT NEED TO DEVELOP EARLY DIAGNOSTIC MARKERS OF HCC AND EFFECTIVE THERAPIES AGAINST CHRONIC HEPATITIS B. DECIPHERING THE ONCOGENIC MECHANISMS THAT UNDERLIE HBV-RELATED TUMORIGENESIS MIGHT HELP DEVELOPING ADAPTED THERAPEUTIC STRATEGIES. 2014 7 2165 31 EPIGENETIC MECHANISMS IN HEPATITIS B VIRUS-ASSOCIATED HEPATOCELLULAR CARCINOMA. CHRONIC INFECTION OF THE LIVER BY THE HEPATITIS B VIRUS (HBV) IS ASSOCIATED WITH INCREASED RISK FOR DEVELOPING HEPATOCELLULAR CARCINOMA (HCC). A MULTITUDE OF STUDIES HAVE INVESTIGATED THE MECHANISM OF LIVER CANCER PATHOGENESIS DUE TO CHRONIC HBV INFECTION. CHRONIC INFLAMMATION, EXPRESSION OF SPECIFIC VIRAL PROTEINS SUCH AS HBX, THE INTEGRATION SITE OF THE VIRAL GENOME INTO THE HOST GENOME, AND THE VIRAL GENOTYPE, ARE KEY PLAYERS CONTRIBUTING TO HCC PATHOGENESIS. IN ADDITION, THE GENETIC BACKGROUND OF THE HOST AND EXPOSURE TO ENVIRONMENTAL CARCINOGENS ARE ALSO PREDISPOSING PARAMETERS IN HEPATOCARCINOGENESIS. DESPITE THE PLETHORA OF STUDIES, THE MOLECULAR MECHANISM OF HCC PATHOGENESIS REMAINS INCOMPLETELY UNDERSTOOD. IN THIS REVIEW, THE FOCUS IS ON EPIGENETIC MECHANISMS INVOLVED IN THE PATHOGENESIS OF HBV-ASSOCIATED HCC. EPIGENETIC MECHANISMS ARE DYNAMIC MOLECULAR PROCESSES THAT REGULATE GENE EXPRESSION WITHOUT ALTERING THE HOST DNA, ACTING BY MODIFYING THE HOST CHROMATIN STRUCTURE VIA COVALENT POST-TRANSLATIONAL HISTONE MODIFICATIONS, CHANGING THE DNA METHYLATION STATUS, EXPRESSION OF NON-CODING RNAS SUCH AS MICRORNAS AND LONG NONCODING RNAS, AND ALTERING THE SPATIAL, 3-D ORGANIZATION OF THE CHROMATIN OF THE VIRUS-INFECTED CELL. HEREIN, STUDIES ARE DESCRIBED THAT PROVIDE EVIDENCE IN SUPPORT OF DEREGULATION OF EPIGENETIC MECHANISMS IN THE HBV-INFECTED/-REPLICATING HEPATOCYTE AND THEIR CONTRIBUTION TO HEPATOCYTE TRANSFORMATION. IN CONTRAST TO GENETIC MUTATIONS WHICH ARE PERMANENT, EPIGENETIC ALTERATIONS ARE DYNAMIC AND REVERSIBLE. ACCORDINGLY, THE IDENTIFICATION OF ESSENTIAL MOLECULAR EPIGENETIC TARGETS INVOLVED IN HBV-MEDIATED HCC PATHOGENESIS OFFERS THE OPPORTUNITY FOR THE DESIGN AND DEVELOPMENT OF NOVEL EPIGENETIC THERAPEUTIC APPROACHES. 2021 8 4449 34 MOLECULAR MECHANISM OF HEPATITIS B VIRUS-INDUCED HEPATOCARCINOGENESIS. HEPATITIS B VIRUS (HBV) INFECTION IS A GLOBAL PUBLIC HEALTH PROBLEM WITH APPROXIMATELY 2 BILLION PEOPLE THAT HAVE BEEN EXPOSED TO THE VIRUS. HBV IS A MEMBER OF A FAMILY OF SMALL, ENVELOPED DNA VIRUSES CALLED HEPADNAVIRUSES, AND HAS A PREFERENTIAL TROPISM FOR HEPATOCYTES OF MAMMALS AND BIRDS. EPIDEMIOLOGICAL STUDIES HAVE PROVED A STRONG CORRELATION BETWEEN CHRONIC HEPATITIS B VIRUS INFECTION AND THE DEVELOPMENT OF HEPATOCELLULAR CARCINOMA (HCC). HCC IS THE FIFTH MOST COMMON MALIGNANCY WITH ABOUT 700000 NEW CASES EACH YEAR, AND MORE THAN 50% OF THEM ARISE IN HBV CARRIERS. A LARGE NUMBER OF STUDIES DESCRIBE THE WAY IN WHICH HBV CAN CONTRIBUTE TO HCC DEVELOPMENT. MULTIPLE MECHANISMS HAVE BEEN PROPOSED, INCLUDING THE ACCUMULATION OF GENETIC DAMAGE DUE TO IMMUNE-MEDIATED HEPATIC INFLAMMATION AND THE INDUCTION OF OXIDATIVE STRESS. THERE IS EVIDENCE OF THE DIRECT EFFECTS OF THE VIRAL PROTEINS HBX AND HBS ON THE CELL BIOLOGY. INTEGRATION OF HBV-DNA INTO THE HUMAN GENOME IS CONSIDERED AN EARLY EVENT IN THE CARCINOGENIC PROCESS AND CAN INDUCE, THROUGH INSERTIONAL MUTAGENESIS, THE ALTERATION OF GENE EXPRESSION AND CHROMOSOMAL INSTABILITY. HBV HAS ALSO EPIGENETIC EFFECTS THROUGH THE MODIFICATION OF THE GENOMIC METHYLATION STATUS. FURTHERMORE, THE VIRUS PLAYS AN IMPORTANT ROLE IN THE REGULATION OF MICRORNA EXPRESSION. THIS REVIEW WILL SUMMARIZE THE MANY MECHANISMS INVOLVED IN HBV-RELATED LIVER CARCINOGENESIS. 2014 9 3187 32 HBV INDUCED HEPATOCELLULAR CARCINOMA AND RELATED POTENTIAL IMMUNOTHERAPY. CHRONIC INFECTION OF HEPATITIS B VIRUS (HBV) HAS LONG BEEN RECOGNIZED AS A MAJOR RISK FACTOR IN THE INITIATION AND DEVELOPMENT OF HEPATOCELLULAR CARCINOMA (HCC), CONTRIBUTING TO OVER HALF THE CASES OF HCC WORLDWIDE. TRANSFORMATION OF THE LIVER WITH HBV INFECTION TO HCC MAINLY RESULTS FROM LONG-TERM INTERACTION BETWEEN HBV AND THE HOST HEPATOCYTES VIA A VARIETY OF MECHANISMS, INCLUDING HBV DNA INTEGRATION, PROLONGED EXPRESSION OF THE VIRAL HBX REGULATORY PROTEIN AND/OR ABERRANT PRES/S ENVELOPE PROTEINS, AND EPIGENETIC DYSREGULATION OF TUMOR SUPPRESSOR GENES. WHILE THERE HAVE BEEN SEVERAL FAILURES IN THE DEVELOPMENT OF DRUGS FOR HCC, THE IMMUNE-TOLERANT MICROENVIRONMENT OF THIS MALIGNANCY SUGGESTS THAT IMMUNOTHERAPEUTIC AGENTS COULD PROVIDE BENEFITS FOR THESE PATIENTS. THIS IS SUPPORTED BY RECENT DATA SHOWING THAT IMMUNOTHERAPY HAS PROMISING ACTIVITY IN PATIENTS WITH ADVANCED HCC. IN THIS REVIEW, WE PROVIDE AN OVERVIEW OF HBV-INDUCED HCC AND RECENT IMMUNE BASED APPROACHES FOR THE TREATMENT OF HCC PATIENTS. 2020 10 1478 25 DIVERSE ROLES OF HEPATITIS B VIRUS IN LIVER CANCER. HEPATITIS B VIRUS (HBV) IS A WIDESPREAD HUMAN PATHOGEN RESPONSIBLE FOR ACUTE AND CHRONIC LIVER DISEASES. THE HEPATITIS B BURDEN IS PARTICULARLY HEAVY IN ENDEMIC COUNTRIES, WHERE LIVER CIRRHOSIS AND HEPATOCELLULAR CARCINOMA ARE LEADING CAUSES OF DEATH. HOWEVER, THE ONCOGENIC ROLE OF HBV REMAINS ENIGMATIC. AS THE VIRUS HAS NO CYTOPATHIC EFFECT, LIVER DAMAGE IS ATTRIBUTED TO IMMUNE RESPONSES THAT INDUCE INFLAMMATION, APOPTOSIS AND REGENERATION, FOSTERING THE ACCUMULATION OF GENETIC AND EPIGENETIC ALTERATIONS. IN A MORE DIRECT ACTION, FREQUENT INTEGRATION OF HBV DNA INTO HOST CHROMOSOMES MAY LEAD TO INSERTIONAL MUTAGENESIS OF CANCER-RELATED GENES AND CHROMOSOMAL INSTABILITY. HBV PROTEINS, NOTABLY THE HBX TRANSACTIVATOR, PARTICIPATE AS CO-FACTORS IN ONCOGENESIS. BETTER UNDERSTANDING OF HEPATITIS B PATHOGENESIS IS MANDATORY FOR IMPROVING DISEASE MANAGEMENT. 2012 11 2980 29 GENETIC BASIS OF HEPATITIS VIRUS-ASSOCIATED HEPATOCELLULAR CARCINOMA: LINKAGE BETWEEN INFECTION, INFLAMMATION, AND TUMORIGENESIS. HEPATITIS VIRUS INFECTION IS A LEADING CAUSE OF CHRONIC LIVER DISEASE, INCLUDING CIRRHOSIS AND HEPATOCELLULAR CARCINOMA (HCC). ALTHOUGH ANTI-VIRAL THERAPIES AGAINST HEPATITIS B VIRUS (HBV) AND HEPATITIS C VIRUS (HCV) HAVE DRAMATICALLY PROGRESSED DURING THE PAST DECADE, THE ESTIMATED NUMBER OF PEOPLE CHRONICALLY INFECTED WITH HBV AND/OR HCV IS ~370 MILLION, AND HEPATITIS VIRUS-ASSOCIATED HEPATOCARCINOGENESIS IS A SERIOUS HEALTH CONCERN WORLDWIDE. UNDERSTANDING THE MECHANISM OF VIRUS-ASSOCIATED CARCINOGENESIS IS CRUCIAL TOWARD BOTH TREATMENT AND PREVENTION, AND THE RECENTLY DEVELOPED WHOLE GENOME/EXOME SEQUENCING ANALYSIS USING NEXT-GENERATION SEQUENCING TECHNOLOGIES HAS CONTRIBUTED TO UNVEILING THE LANDSCAPE OF GENETIC AND EPIGENETIC ABERRATIONS IN NOT ONLY TUMOR TISSUES BUT ALSO THE BACKGROUND LIVER TISSUES UNDERLYING CHRONIC LIVER DAMAGE CAUSED BY HEPATITIS VIRUS INFECTION. SEVERAL MAJOR MECHANISMS UNDERLIE THE GENETIC AND EPIGENETIC ABERRATIONS IN THE HEPATITIS VIRUS-INFECTED LIVER, SUCH AS THE GENERATION OF REACTIVE OXIDATIVE STRESS, ECTOPIC EXPRESSION OF DNA MUTATOR ENZYMES, AND DYSFUNCTION OF THE DNA REPAIR SYSTEM. IN ADDITION, DIRECT ONCOGENIC EFFECTS OF HEPATITIS VIRUS, REPRESENTED BY THE INTEGRATION OF HBV-DNA, ARE OBSERVED IN INFECTED HEPATOCYTES. ELUCIDATING THE WHOLE PICTURE OF GENETIC AND EPIGENETIC ALTERATIONS, AS WELL AS THE MECHANISMS OF TUMORIGENESIS, WILL FACILITATE THE DEVELOPMENT OF EFFICIENT TREATMENT AND PREVENTION STRATEGIES FOR HEPATITIS VIRUS-ASSOCIATED HCC. 2017 12 2939 25 GENETIC AND EPIGENETIC ALTERATIONS IN HEPATITIS B VIRUS-ASSOCIATED HEPATOCELLULAR CARCINOMA. HEPATITIS B VIRUS (HBV) IS A MAJOR CAUSE OF HEPATOCELLULAR CARCINOMA (HCC). ITS CHRONIC INFECTION CAN LEAD TO CHRONIC LIVER INFLAMMATION AND THE ACCUMULATION OF GENETIC ALTERATIONS TO RESULT IN THE ONCOGENIC TRANSFORMATION OF HEPATOCYTES. HBV CAN ALSO SENSITIZE HEPATOCYTES TO ONCOGENIC TRANSFORMATION BY CAUSING GENETIC AND EPIGENETIC CHANGES OF THE HOST CHROMOSOMES. HBV DNA CAN INSERT INTO HOST CHROMOSOMES AND RECENT LARGE-SCALE WHOLE-GENOME SEQUENCING STUDIES REVEALED RECURRENT HBV DNA INTEGRATIONS SITES THAT MAY PLAY IMPORTANT ROLES IN THE INITIATION OF HEPATOCELLULAR CARCINOGENESIS. HBV CAN ALSO CAUSE EPIGENETIC CHANGES BY ALTERING THE METHYLATION STATUS OF CELLULAR DNA, THE POST-TRANSLATIONAL MODIFICATION OF HISTONES, AND THE EXPRESSION OF MICRORNAS. THESE CHANGES CAN ALSO LEAD TO THE EVENTUAL HEPATOCELLULAR TRANSFORMATION. THESE RECENT FINDINGS ON THE GENETIC AND EPIGENETIC ALTERATIONS OF THE HOST CHROMOSOMES INDUCED BY HBV OPENED A NEW AVENUE FOR THE DEVELOPMENT OF NOVEL DIAGNOSIS AND TREATMENTS FOR HBV-INDUCED HCC. 2015 13 3250 28 HEPATITIS B VIRUS INFECTION, MICRORNAS AND LIVER DISEASE. HEPATITIS B VIRUS (HBV) ATTACKS THE LIVER AND CAN CAUSE BOTH ACUTE AS WELL AS CHRONIC LIVER DISEASES WHICH MIGHT LEAD TO LIVER CIRRHOSIS AND HEPATOCELLULAR CARCINOMA. REGARDLESS OF THE AVAILABILITY OF A VACCINE AND NUMEROUS TREATMENT OPTIONS, HBV IS A MAJOR CAUSE OF MORBIDITY AND MORTALITY ACROSS THE WORLD. RECENTLY,MICRORNAS (MIRNAS) HAVE EMERGED AS IMPORTANT MODULATORS OF GENE FUNCTION. STUDIES ON THE ROLE OF MIRNA IN THE REGULATION OF HEPATITIS B VIRUS GENE EXPRESSION HAVE BEEN THE FOCUS OF MODERN ANTIVIRAL RESEARCH. MIRNAS CAN REGULATE VIRAL REPLICATION AND PATHOGENESIS IN A NUMBER OF DIFFERENT WAYS, WHICH INCLUDEFACILITATION, DIRECT OR INDIRECT INHIBITION, ACTIVATION OF IMMUNE RESPONSE, EPIGENETIC MODULATION, ETC. NEVERTHELESS, THESE MECHANISMS CAN APPROPRIATELY BE USED WITH A DIAGNOSTICAND/OR THERAPEUTIC APPROACH. THE PRESENT REVIEW IS AN ATTEMPT TO CLASSIFY SPECIFIC MIRNAS THAT ARE REPORTED TO BE ASSOCIATED WITH VARIOUS ASPECTS OF HEPATITIS B BIOLOGY, IN ORDER TO PRECISELY PRESENT THE PARTICIPATION OF INDIVIDUAL MIRNAS IN MULTIPLE ASPECTS RELATING TO HBV. 2015 14 5761 33 SOMATIC MUTATIONS, VIRAL INTEGRATION AND EPIGENETIC MODIFICATION IN THE EVOLUTION OF HEPATITIS B VIRUS-INDUCED HEPATOCELLULAR CARCINOMA. LIVER CANCER IN MEN IS THE SECOND LEADING CAUSE OF CANCER DEATH AND HEPATOCELLULAR CARCINOMA (HCC) ACCOUNTS FOR 70%-85% OF THE TOTAL LIVER CANCER WORLDWIDE. CHRONIC INFECTION WITH HEPATITIS B VIRUS (HBV) IS THE MAJOR CAUSE OF HCC. CHRONIC, INTERMITTENTLY ACTIVE INFLAMMATION PROVIDES "FERTILE FIELD" FOR "MUTATION, SELECTION, AND ADAPTATION" OF HBV AND THE INFECTED HEPATOCYTES, A LONG-TERM EVOLUTIONARY PROCESS DURING HBV-INDUCED CARCINOGENESIS. HBV MUTATIONS, WHICH ARE POSITIVELY SELECTED BY INSUFFICIENT IMMUNITY, CAN PROMOTE AND PREDICT THE OCCURRENCE OF HCC. RECENTLY, ADVANCED SEQUENCING TECHNOLOGIES INCLUDING WHOLE GENOME SEQUENCING, EXOME SEQUENCING, AND RNA SEQUENCING PROVIDE OPPORTUNITIES TO BETTER UNDER-STAND THE INSIGHT OF HOW SOMATIC MUTATIONS, STRUCTURE VARIATIONS, HBV INTEGRATIONS, AND EPIGENETIC MODIFICATIONS CONTRIBUTE TO HCC DEVELOPMENT. GENOMIC VARIATIONS OF HCC CAUSED BY VARIOUS ETIOLOGICAL FACTORS MAY BE DIFFERENT, BUT THE COMMON DRIVER MUTATIONS ARE IMPORTANT TO ELUCIDATE THE HCC EVOLUTIONARY PROCESS. GENOME-WIDE ANALYSES OF HBV INTEGRATIONS ARE HELPFUL IN CLARIFYING THE TARGETED GENES OF HBV IN CARCINOGENESIS AND DISEASE PROGRESSION. RNA SEQUENCING CAN IDENTIFY KEY MOLECULES WHOSE EXPRESSIONS ARE EPIGENETICALLY MODIFIED DURING HCC EVOLUTION. IN THIS REVIEW, WE SUMMARIZED THE CURRENT FINDINGS OF NEXT GENERATION SEQUENCINGS FOR HBV-HCC AND PROPOSED A THEORY FRAMEWORK OF CANCER EVOLUTION AND DEVELOPMENT BASED ON THE CURRENT KNOWLEDGE OF HBV-INDUCED HCC TO CHARACTERIZE AND INTERPRET EVOLUTIONARY MECHANISMS OF HCC AND POSSIBLE OTHER CANCERS. UNDERSTANDING THE KEY VIRAL AND GENOMIC VARIATIONS INVOLVED IN HCC EVOLUTION IS ESSENTIAL FOR GENERATING EFFECTIVE DIAGNOSTIC, PROGNOSTIC, AND PREDICTIVE BIOMARKERS AS WELL AS THERAPEUTIC TARGETS FOR THE INTERVENTIONS OF HBV-HCC. 2014 15 3257 27 HEPATITIS B X ANTIGEN (HBX) IS AN IMPORTANT THERAPEUTIC TARGET IN THE PATHOGENESIS OF HEPATOCELLULAR CARCINOMA. HEPATITIS B VIRUS (HBV) IS A HUMAN PATHOGEN THAT HAS INFECTED AN ESTIMATED TWO BILLION PEOPLE WORLDWIDE. DESPITE THE AVAILABILITY OF HIGHLY EFFICACIOUS VACCINES, UNIVERSAL SCREENING OF THE BLOOD SUPPLY FOR VIRUS, AND POTENT DIRECT ACTING ANTI-VIRAL DRUGS, THERE ARE MORE THAN 250 MILLION CARRIERS OF HBV WHO ARE AT RISK FOR THE SEQUENTIAL DEVELOPMENT OF HEPATITIS, FIBROSIS, CIRRHOSIS AND HEPATOCELLULAR CARCINOMA (HCC). MORE THAN 800,000 DEATHS PER YEAR ARE ATTRIBUTED TO CHRONIC HEPATITIS B. MANY DIFFERENT THERAPEUTIC APPROACHES HAVE BEEN DEVELOPED TO BLOCK VIRUS REPLICATION, AND ALTHOUGH EFFECTIVE, NONE ARE CURATIVE. THESE TREATMENTS HAVE LITTLE OR NO IMPACT UPON THE PORTIONS OF INTEGRATED HBV DNA, WHICH OFTEN ENCODE THE VIRUS REGULATORY PROTEIN, HBX. ALTHOUGH GIVEN LITTLE ATTENTION, HBX IS AN IMPORTANT THERAPEUTIC TARGET BECAUSE IT CONTRIBUTES IMPORTANTLY TO (A) HBV REPLICATION, (B) IN PROTECTING INFECTED CELLS FROM IMMUNE MEDIATED DESTRUCTION DURING CHRONIC INFECTION, AND (C) IN THE DEVELOPMENT OF HCC. THUS, THE DEVELOPMENT OF THERAPIES TARGETING HBX, COMBINED WITH OTHER ESTABLISHED THERAPIES, WILL PROVIDE A FUNCTIONAL CURE THAT WILL TARGET VIRUS REPLICATION AND FURTHER REDUCE OR ELIMINATE BOTH THE MORBIDITY AND MORTALITY ASSOCIATED WITH CHRONIC LIVER DISEASE AND HCC. SIMULTANEOUS TARGETING OF ALL THESE CHARACTERISTICS UNDERSCORES THE IMPORTANCE OF DEVELOPING THERAPIES AGAINST HBX. 2021 16 4920 23 PARALLEL EPIGENETIC AND GENETIC CHANGES IN THE PATHOGENESIS OF HEPATITIS VIRUS-ASSOCIATED HEPATOCELLULAR CARCINOMA. HEPATOCELLULAR CARCINOMA (HCC) IS ONE OF THE MOST FREQUENT TUMOR TYPES IN THE WORLD, WITH SHORT SURVIVAL TIMES AND FEW TREATMENT OPTIONS. HEPATITIS B VIRUS (HBV) AND HEPATITIS C VIRUS (HCV) ARE MAJOR ETIOLOGIC AGENTS OF HCC, ALTHOUGH THE ASSOCIATED MECHANISMS ARE INCOMPLETELY UNDERSTOOD. THE AVAILABLE EVIDENCE SUGGESTS THAT BOTH VIRUSES PROMOTE TUMORIGENESIS BY UP-REGULATING GENES THAT PROMOTE HEPATOCELLULAR GROWTH AND SURVIVAL, AND BY DOWN-REGULATING OTHER GENES THAT ACT AS TUMOR SUPPRESSORS AND NEGATIVE GROWTH REGULATORY MOLECULES. SIGNIFICANTLY, A NUMBER OF THE PATHWAYS THAT ARE ALTERED BY THESE VIRUSES ARE THE SAME ONES THAT ACCUMULATE GENETIC ALTERATIONS DURING TUMOR PROGRESSION. THIS SUGGESTS THAT THE PATHWAYS THAT PROMOTE VIRUS PERSISTENCE AND REPLICATION MAY ALSO PROMOTE CELL GROWTH AND SURVIVAL. FROM THE PERSPECTIVE OF THE VIRUS, THIS PROMOTES CHRONIC INFECTION, WHILE FROM THE PERSPECTIVE OF THE HOST, THIS PROMOTES TUMORIGENESIS. 2006 17 4475 25 MOLECULAR PATHOGENESIS OF HEPATITIS C VIRUS-ASSOCIATED HEPATOCELLULAR CARCINOMA. CHRONIC INFECTION WITH HEPATITIS C VIRUS (HCV) IS CAUSALLY ASSOCIATED WITH THE DEVELOPMENT OF HEPATOCELLULAR CARCINOMA (HCC). HCV IS NOT CYTOLYTIC AND REPLICATES ENTIRELY IN THE CYTOPLASM. VIRAL INTERACTION WITH THE HOST LEADS TO SUBVERSION OF IMMUNE RESPONSE AND OTHER DEFENSE MECHANISMS. THE RECENT DEVELOPMENT OF ROBUST CELL CULTURE SYSTEMS FOR HCV INFECTION PROVIDES NEW OPPORTUNITIES FOR THE STUDY OF VIRUS-CELL INTERACTION AND VIRAL PATHOGENESIS. HCV INFECTION CAUSES ACTIVE INFLAMMATION AND FIBROSIS, WHICH ULTIMATELY PROGRESSES TO CIRRHOSIS. THE ONSET OF CIRRHOSIS USUALLY PRECEDES THE MULTISTAGE PROCESS OF TUMOR DEVELOPMENT, IN WHICH COMMON THEMES OF VIRAL CARCINOGENESIS CAN BE IDENTIFIED. WHILE CHRONIC INFLAMMATION AND CIRRHOSIS ARE THOUGHT TO PLAY AN IMPORTANT ROLE IN TUMOR INITIATION, THE UNDERLYING MECHANISMS ARE INCOMPLETELY UNDERSTOOD. RECENT STUDIES HAVE REVEALED THAT INFECTION WITH HCV INDUCES GENOME INSTABILITY, LEADING TO FURTHER GENETIC AND EPIGENETIC ALTERATIONS WHICH CONTRIBUTE TO THE FULL DEVELOPMENT OF HCC TUMOR. THE EXPRESSION OF VIRAL ONCOPROTEINS SUCH AS C AND NS5A IS CRITICALLY INVOLVED BOTH IN THE INDUCTION OF GENOME INSTABILITY AND IN DYSREGULATING CELLULAR CONTROL OF GROWTH AND SIGNAL TRANSDUCTION. A BETTER UNDERSTANDING OF THE MOLECULAR PATHOGENESIS OF HCV WILL REVEAL NOVEL STRATEGIES FOR THE PREVENTION AND TREATMENT OF RELATED DISEASES INCLUDING HCC. 2007 18 4461 29 MOLECULAR MECHANISMS OF GENDER DISPARITY IN HEPATITIS B VIRUS-ASSOCIATED HEPATOCELLULAR CARCINOMA. CHRONIC HEPATITIS B VIRUS (HBV) INFECTION IS ONE OF THE MOST COMMON CAUSES OF HEPATOCELLULAR CARCINOMA (HCC), A MALIGNANT TUMOR WITH HIGH MORTALITY WORLDWIDE. ONE REMARKABLE CLINICAL FEATURE OF HBV-RELATED HCC IS THAT ITS INCIDENCE IS HIGHER IN MALES AND POSTMENOPAUSAL FEMALES COMPARED TO OTHER FEMALES. INCREASING EVIDENCE INDICATES THAT HBV-ASSOCIATED HCC MAY INVOLVE GENDER DISPARITY AND THAT IT MAY BE A TYPE OF HORMONE-RESPONSIVE MALIGNANT TUMOR. SEX HORMONES, SUCH AS ANDROGEN AND ESTROGEN, HAVE BEEN SHOWN TO PLAY VERY DIFFERENT ROLES IN THE PROGRESSION OF AN HBV INFECTION AND IN THE DEVELOPMENT OF HBV-RELATED HCC. THROUGH BINDING TO THEIR SPECIFIC CELLULAR RECEPTORS AND AFFECTING THE CORRESPONDING SIGNALING PATHWAYS, SEX HORMONES CAN REGULATE THE TRANSACTIVATION OF HBX, CAUSE THE CHRONIC RELEASE OF INFLAMMATORY CYTOKINES IN THE HEPATOCELLULAR MICROENVIRONMENT, AND PARTICIPATE IN EPIGENETIC AND GENETIC ALTERNATIONS IN HEPATOCYTES. ALL OF THESE FUNCTIONS MAY BE RELATED TO THE INITIATION AND PROGRESSION OF HBV-ASSOCIATED HCC. A THOROUGH INVESTIGATION OF THE MOLECULAR MECHANISMS UNDERLYING THE GENDER-RELATED DISPARITY IN HBV-RELATED HCC SHOULD PROVIDE A NEW PERSPECTIVE FOR BETTER UNDERSTANDING ITS PATHOGENESIS AND EXPLORING MORE EFFECTIVE METHODS FOR THE PREVENTION AND TREATMENT OF THIS DISEASE. 2014 19 2240 31 EPIGENETIC MODULATION IN CHRONIC HEPATITIS B VIRUS INFECTION. THE HUMAN HEPATITIS B VIRUS (HBV) IS A SMALL-ENVELOPED DNA VIRUS CAUSING ACUTE AND CHRONIC HEPATITIS. DESPITE THE EXISTENCE OF AN EFFECTIVE PROPHYLACTIC VACCINE AND THE STRONG CAPACITY OF APPROVED ANTIVIRAL DRUGS TO SUPPRESS VIRAL REPLICATION, CHRONIC HBV INFECTION (CHB) CONTINUES TO BE A MAJOR HEALTH BURDEN WORLDWIDE. BOTH THE INABILITY OF THE IMMUNE SYSTEM TO RESOLVE CHB AND THE UNIQUE REPLICATION STRATEGY EMPLOYED BY HBV, WHICH FORMS A STABLE VIRAL COVALENTLY CLOSED CIRCULAR DNA (CCCDNA) MINICHROMOSOME IN THE HEPATOCYTE NUCLEUS, ENABLE INFECTION PERSISTENCE. KNOWLEDGE OF THE COMPLEX NETWORK OF INTERACTIONS THAT HBV ENGAGES WITH ITS HOST IS STILL LIMITED BUT ACCUMULATING EVIDENCE INDICATES THAT EPIGENETIC MODIFICATIONS OCCURRING BOTH ON THE CCCDNA AND ON THE HOST GENOME IN THE COURSE OF INFECTION ARE ESSENTIAL TO MODULATE VIRAL ACTIVITY AND LIKELY CONTRIBUTE TO PATHOGENESIS AND CANCER DEVELOPMENT. THUS, A DEEPER UNDERSTANDING OF EPIGENETIC REGULATORY PROCESSES MAY OPEN NEW VENUES TO CONTROL AND EVENTUALLY CURE CHB. THIS REVIEW SUMMARIZES MAJOR FINDINGS IN HBV EPIGENETIC RESEARCH, FOCUSING ON THE EPIGENETIC MECHANISMS REGULATING CCCDNA ACTIVITY AND THE MODIFICATIONS DETERMINED IN INFECTED HOST CELLS AND TUMOR LIVER TISSUES. 2020 20 915 35 CHRONIC HEPATITIS B VIRUS AND HEPATITIS C VIRUS INFECTIONS AND CANCER: SYNERGY BETWEEN VIRAL AND HOST FACTORS. HEPATITIS B VIRUS (HBV) OR HEPATITIS C VIRUS (HCV) INFECTIONS REPRESENT MAJOR CAUSES OF CHRONIC LIVER DISEASE AND HEPATOCELLULAR CARCINOMA. DESPITE INDUCING SHARED PATHOLOGICAL EVENTS LEADING TO ONCOGENIC TRANSFORMATION, THESE TWO VIRUSES PRESENT PROFOUND DIFFERENCES IN THEIR MOLECULAR FEATURES, LIFE CYCLE AND INTERPLAY WITH HOST FACTORS, WHICH SIGNIFICANTLY DIFFERENTIATE THE PROGNOSTIC AND THERAPEUTIC APPROACH TO THE RELATED DISEASES. IN THE PRESENT REVIEW, WE REPORT THE MAIN MECHANISMS INVOLVED IN THE MULTISTEP PROCESS LEADING FROM HCV/HBV INFECTION AND CANCER DEVELOPMENT, DISCUSSING SIDE-BY-SIDE THE ANALOGIES AND DIFFERENCES BETWEEN THE TWO VIRUSES. SUCH EVENTS CAN BE BROADLY CATEGORIZED INTO (A) DIRECT ONCOGENIC EFFECTS, INVOLVING INTEGRATION IN THE HOST GENOME (IN THE CASE OF HBV) AND CHROMOSOMAL INSTABILITY, INTERFERENCE WITH ONCOSUPPRESSOR PATHWAYS, INDUCTION OF OXIDATIVE STRESS, PROMOTION OF ANGIOGENESIS, EPITHELIAL-MESENCHYMAL TRANSITION, ALTERATIONS IN THE EPIGENETIC ASSET AND INTERACTION WITH NON-CODING RNAS; AND (B) INDIRECT ACTIVITIES MOSTLY MEDIATED BY HOST EVENTS, INCLUDING CHRONIC INFLAMMATION SUSTAINED BY PECULIAR CYTOKINE NETWORKS (SUCH AS INTERLEUKIN-6 AND LYMPHOTOXINS), METABOLIC DYSFUNCTIONS PROMOTED BY STEATOHEPATITIS, INTERPLAY WITH GUT MICROBIOTA AND FIBROTIC EVENTS (MAINLY IN HCV INFECTION). THIS SCENARIO SUGGESTS THAT THE INTEGRATED STUDY OF VIRAL AND HOST FACTORS MAY LEAD TO THE SUCCESSFUL DEVELOPMENT OF NOVEL BIOMARKERS AND TARGETS FOR THERAPY. 2015