1 40 182 A COMPARISON OF HERPES SIMPLEX VIRUS TYPE 1 AND VARICELLA-ZOSTER VIRUS LATENCY AND REACTIVATION. HERPES SIMPLEX VIRUS TYPE 1 (HSV-1; HUMAN HERPESVIRUS 1) AND VARICELLA-ZOSTER VIRUS (VZV; HUMAN HERPESVIRUS 3) ARE HUMAN NEUROTROPIC ALPHAHERPESVIRUSES THAT CAUSE LIFELONG INFECTIONS IN GANGLIA. FOLLOWING PRIMARY INFECTION AND ESTABLISHMENT OF LATENCY, HSV-1 REACTIVATION TYPICALLY RESULTS IN HERPES LABIALIS (COLD SORES), BUT CAN OCCUR FREQUENTLY ELSEWHERE ON THE BODY AT THE SITE OF PRIMARY INFECTION (E.G. WHITLOW), PARTICULARLY AT THE GENITALS. RARELY, HSV-1 REACTIVATION CAN CAUSE ENCEPHALITIS; HOWEVER, A THIRD OF THE CASES OF HSV-1 ENCEPHALITIS ARE ASSOCIATED WITH HSV-1 PRIMARY INFECTION. PRIMARY VZV INFECTION CAUSES VARICELLA (CHICKENPOX) FOLLOWING WHICH LATENT VIRUS MAY REACTIVATE DECADES LATER TO PRODUCE HERPES ZOSTER (SHINGLES), AS WELL AS AN INCREASINGLY RECOGNIZED NUMBER OF SUBACUTE, ACUTE AND CHRONIC NEUROLOGICAL CONDITIONS. FOLLOWING PRIMARY INFECTION, BOTH VIRUSES ESTABLISH A LATENT INFECTION IN NEURONAL CELLS IN HUMAN PERIPHERAL GANGLIA. HOWEVER, THE DETAILED MECHANISMS OF VIRAL LATENCY AND REACTIVATION HAVE YET TO BE UNRAVELLED. IN BOTH CASES LATENT VIRAL DNA EXISTS IN AN 'END-LESS' STATE WHERE THE ENDS OF THE VIRUS GENOME ARE JOINED TO FORM STRUCTURES CONSISTENT WITH UNIT LENGTH EPISOMES AND CONCATEMERS, FROM WHICH VIRAL GENE TRANSCRIPTION IS RESTRICTED. IN LATENTLY INFECTED GANGLIA, THE MOST ABUNDANTLY DETECTED HSV-1 RNAS ARE THE SPLICED PRODUCTS ORIGINATING FROM THE PRIMARY LATENCY ASSOCIATED TRANSCRIPT (LAT). THIS PRIMARY LAT IS AN 8.3 KB UNSTABLE TRANSCRIPT FROM WHICH TWO STABLE (1.5 AND 2.0 KB) INTRONS ARE SPLICED. TRANSCRIPTS MAPPING TO 12 VZV GENES HAVE BEEN DETECTED IN HUMAN GANGLIA REMOVED AT AUTOPSY; HOWEVER, IT IS DIFFICULT TO ASCRIBE THESE AS TRANSCRIPTS PRESENT DURING LATENT INFECTION AS EARLY-STAGE VIRUS REACTIVATION MAY HAVE TRANSPIRED IN THE POST-MORTEM TIME PERIOD IN THE GANGLIA. NONETHELESS, LOW-LEVEL TRANSCRIPTION OF VZV ORF63 HAS BEEN REPEATEDLY DETECTED IN MULTIPLE GANGLIA REMOVED AS CLOSE TO DEATH AS POSSIBLE. THERE IS INCREASING EVIDENCE THAT HSV-1 AND VZV LATENCY IS EPIGENETICALLY REGULATED. IN VITRO MODELS THAT PERMIT PATHWAY ANALYSIS AND IDENTIFICATION OF BOTH EPIGENETIC MODULATIONS AND GLOBAL TRANSCRIPTIONAL MECHANISMS OF HSV-1 AND VZV LATENCY HOLD MUCH PROMISE FOR OUR FUTURE UNDERSTANDING IN THIS COMPLEX AREA. THIS REVIEW SUMMARIZES THE MOLECULAR BIOLOGY OF HSV-1 AND VZV LATENCY AND REACTIVATION, AND ALSO PRESENTS FUTURE DIRECTIONS FOR STUDY. 2015 2 729 29 CANCER ANGIOGENESIS INDUCED BY KAPOSI SARCOMA-ASSOCIATED HERPESVIRUS IS MEDIATED BY EZH2. EZH2 IS A COMPONENT OF THE EPIGENETIC REGULATOR PRC2 THAT SUPPRESSES GENE EXPRESSION. ELEVATED EXPRESSION OF EZH2 IS COMMON IN HUMAN CANCERS AND IS ASSOCIATED WITH TUMOR PROGRESSION AND POOR PROGNOSIS. IN THIS STUDY, WE SHOW THAT EZH2 ELEVATION IS ASSOCIATED WITH EPIGENETIC MODIFICATIONS OF KAPOSI SARCOMA-ASSOCIATED HERPESVIRUS (KSHV), AN ONCOGENIC VIRUS THAT PROMOTES THE DEVELOPMENT OF KAPOSI SARCOMA AND OTHER MALIGNANCIES THAT OCCUR IN PATIENTS WITH CHRONIC HIV INFECTIONS. KSHV INDUCTION OF EZH2 EXPRESSION WAS ESSENTIAL FOR KSHV-INDUCED ANGIOGENESIS. HIGH EXPRESSION OF EZH2 WAS OBSERVED IN KAPOSI SARCOMA TUMORS. IN CELL CULTURE, LATENT KSHV INFECTION UPREGULATED THE EXPRESSION OF EZH2 IN HUMAN ENDOTHELIAL CELLS THROUGH THE EXPRESSION OF VFLIP AND LANA, TWO KSHV-LATENT GENES THAT ACTIVATE THE NF-KAPPAB PATHWAY. KSHV-MEDIATED UPREGULATION OF EZH2 WAS REQUIRED FOR THE INDUCTION OF EPHRIN-B2, AN ESSENTIAL PROANGIOGENIC FACTOR THAT DRIVES ENDOTHELIAL CELL TUBULE FORMATION. TAKEN TOGETHER, OUR FINDINGS INDICATE THAT KSHV REGULATES THE HOST EPIGENETIC MODIFIER EZH2 TO PROMOTE ANGIOGENESIS. 2012 3 6697 67 VARICELLA-ZOSTER VIRUS HUMAN GANGLIONIC LATENCY: A CURRENT SUMMARY. VARICELLA-ZOSTER VIRUS (VZV) IS A UBIQUITOUS HUMAN HERPES VIRUS TYPICALLY ACQUIRED IN CHILDHOOD WHEN IT CAUSES VARICELLA (CHICKENPOX), FOLLOWING WHICH THE VIRUS ESTABLISHES A LATENT INFECTION IN TRIGEMINAL AND DORSAL ROOT GANGLIA THAT LASTS FOR THE LIFE OF THE INDIVIDUAL. VZV SUBSEQUENTLY REACTIVATES, SPONTANEOUSLY OR AFTER SPECIFIC TRIGGERING FACTORS, TO CAUSE HERPES ZOSTER (SHINGLES), WHICH MAY BE COMPLICATED BY POSTHERPETIC NEURALGIA AND SEVERAL OTHER NEUROLOGICAL COMPLICATIONS INCLUDING VASCULOPATHY. OUR UNDERSTANDING OF VZV LATENCY LAGS BEHIND OUR KNOWLEDGE OF HERPES SIMPLEX VIRUS TYPE 1 (HSV-1) LATENCY PRIMARILY DUE TO THE DIFFICULTY IN PROPAGATING THE VIRUS TO HIGH TITERS IN A CELL-FREE STATE, AND THE LACK OF A SUITABLE SMALL-ANIMAL MODEL FOR STUDYING VIRUS LATENCY AND REACTIVATION. IT IS NOW ESTABLISHED BEYOND DOUBT THAT LATENT VZV IS PREDOMINANTLY LOCATED IN HUMAN GANGLIONIC NEURONS. VIRUS GENE TRANSCRIPTION DURING LATENCY IS EPIGENETICALLY REGULATED, AND APPEARS TO BE RESTRICTED TO EXPRESSION OF AT LEAST SIX GENES, WITH EXPRESSION OF GENE 63 BEING THE HALLMARK OF LATENCY. HOWEVER, VIRAL GENE TRANSCRIPTION MAY BE MORE EXTENSIVE THAN PREVIOUSLY THOUGHT. THERE IS ALSO EVIDENCE FOR SEVERAL VZV GENES BEING EXPRESSED AT THE PROTEIN LEVEL, INCLUDING VZV GENE 63-ENCODED PROTEIN, BUT RECENT EVIDENCE SUGGESTS THAT THIS MAY NOT BE A COMMON EVENT. THE NATURE AND EXTENT OF THE CHRONIC INFLAMMATORY RESPONSE IN LATENTLY INFECTED GANGLIA IS ALSO OF CURRENT INTEREST. THERE REMAIN SEVERAL QUESTIONS CONCERNING THE VZV LATENCY PROCESS THAT STILL NEED TO BE RESOLVED UNAMBIGUOUSLY AND IT IS LIKELY THAT THIS WILL REQUIRE THE USE OF NEWLY DEVELOPED MOLECULAR TECHNOLOGIES, SUCH AS GEXPS MULTIPLEX POLYMERASE CHAIN REACTION (PCR) FOR VIRUS TRANSCRIPTIONAL ANALYSIS AND CHIP-SEQ TO STUDY THE EPIGENETIC OF LATENT VIRUS GENOME ( LIU ET AL, 2010 , BMC BIOL 8: 56). 2010 4 1057 40 CLINICAL MANIFESTATIONS AND EPIGENETIC REGULATION OF ORAL HERPESVIRUS INFECTIONS. THE ORAL CAVITY IS OFTEN THE FIRST SITE WHERE VIRUSES INTERACT WITH THE HUMAN BODY. THE ORAL EPITHELIUM IS A MAJOR SITE OF VIRAL ENTRY, REPLICATION AND SPREAD TO OTHER CELL TYPES, WHERE CHRONIC INFECTION CAN BE ESTABLISHED. IN ADDITION, SALIVA HAS BEEN SHOWN AS A PRIMARY ROUTE OF PERSON-TO-PERSON TRANSMISSION FOR MANY VIRUSES. FROM A CLINICAL PERSPECTIVE, VIRAL INFECTION CAN LEAD TO SEVERAL ORAL MANIFESTATIONS, RANGING FROM COMMON INTRAORAL LESIONS TO TUMORS. DESPITE THE CLINICAL AND BIOLOGICAL RELEVANCE OF INITIAL ORAL INFECTION, LITTLE IS KNOWN ABOUT THE MECHANISM OF REGULATION OF THE VIRAL LIFE CYCLE IN THE ORAL CAVITY. SEVERAL VIRUSES UTILIZE HOST EPIGENETIC MACHINERY TO PROMOTE THEIR OWN LIFE CYCLE. IMPORTANTLY, VIRAL HIJACKING OF HOST CHROMATIN-MODIFYING ENZYMES CAN ALSO LEAD TO THE DYSREGULATION OF HOST FACTORS AND IN THE CASE OF ONCOGENIC VIRUSES MAY ULTIMATELY PLAY A ROLE IN PROMOTING TUMORIGENESIS. GIVEN THE KNOWN ROLES OF EPIGENETIC REGULATION OF VIRAL INFECTION, EPIGENETIC-TARGETED ANTIVIRAL THERAPY HAS BEEN RECENTLY EXPLORED AS A THERAPEUTIC OPTION FOR CHRONIC VIRAL INFECTION. IN THIS REVIEW, WE HIGHLIGHT THREE HERPESVIRUSES WITH KNOWN ROLES IN ORAL INFECTION, INCLUDING HERPES SIMPLEX VIRUS TYPE 1, EPSTEIN-BARR VIRUS AND KAPOSI'S SARCOMA-ASSOCIATED HERPESVIRUS. WE FOCUS ON THE RESPECTIVE ORAL CLINICAL MANIFESTATIONS OF THESE VIRUSES AND THEIR EPIGENETIC REGULATION, WITH A SPECIFIC EMPHASIS ON THE VIRAL LIFE CYCLE IN THE ORAL EPITHELIUM. 2021 5 6044 48 THE COMPLEX BIOLOGY OF HUMAN CYTOMEGALOVIRUS LATENCY. WHILE MANY VIRAL INFECTIONS ARE LIMITED AND EVENTUALLY RESOLVED BY THE HOST IMMUNE RESPONSE OR BY DEATH OF THE HOST, OTHER VIRUSES ESTABLISH LONG-TERM RELATIONSHIPS WITH THE HOST BY WAY OF A PERSISTENT INFECTION, THAT RANGE FROM CHRONIC VIRUSES THAT MAY BE EVENTUALLY CLEARED TO THOSE THAT ESTABLISH LIFE-LONG PERSISTENT OR LATENT INFECTION. VIRUSES INFECTING HOSTS FROM BACTERIA TO HUMANS ESTABLISH QUIESCENT INFECTIONS THAT MUST BE REACTIVATED TO PRODUCE PROGENY. FOR MAMMALIAN VIRUSES, MOST NOTABLY HERPESVIRUSES, THIS QUIESCENT MAINTENANCE OF VIRAL GENOMES IN THE ABSENCE OF VIRUS REPLICATION IS REFERRED TO AS LATENCY. THE LATENT STRATEGY ALLOWS THE VIRUS TO PERSIST QUIESCENTLY WITHIN A SINGLE HOST UNTIL CONDITIONS INDICATE A NEED TO REACTIVATE TO REACH A NEW HOST OR, TO RE-SEED A RESERVOIR WITHIN THE HOST. HERE, I REVIEW COMMON THEMES IN VIRAL STRATEGIES TO REGULATE THE LATENT CYCLE AND REACTIVATE FROM IT RANGING FROM BACTERIOPHAGE TO HERPESVIRUSES WITH A FOCUS ON HUMAN CYTOMEGALOVIRUS (HCMV). THEMES CENTRAL TO HERPESVIRUS LATENCY INCLUDE, EPIGENETIC REPRESSION OF VIRAL GENE EXPRESSION AND MECHANISMS TO REGULATE HOST SIGNALING AND SURVIVAL. CRITICAL TO THE SUCCESS OF A LATENT PROGRAM ARE MECHANISMS BY WHICH THE VIRUS CAN "SENSE" FLUCTUATIONS IN HOST BIOLOGY (WITHIN THE HOST) OR ENVIRONMENT (OUTSIDE THE HOST) AND MAKE APPROPRIATE "DECISIONS" TO MAINTAIN LATENCY OR RE-INITIATE THE REPLICATIVE PROGRAM. THE SIGNALS OR ENVIRONMENTS THAT INDICATE THE ESTABLISHMENT OF A LATENT STATE, THE VERY NATURE OF THE LATENT STATE, AS WELL AS THE SIGNALS DRIVING REACTIVATION HAVE BEEN TOPICS OF INTENSE STUDY FROM BACTERIOPHAGE TO HUMAN VIRUSES, AS THESE QUESTIONS ENCOMPASS THE HEIGHT OF COMPLEXITY IN VIRUS-HOST INTERACTIONS-WHERE THE HOST AND THE VIRUS COEXIST. 2022 6 6355 54 THE ROLE OF HERPESVIRUS 6A AND 6B IN MULTIPLE SCLEROSIS AND EPILEPSY. HUMAN HERPESVIRUS 6A (HHV-6A) AND 6B (HHV-6B) ARE TWO CLOSELY RELATED VIRUSES THAT CAN INFECT CELLS OF THE CENTRAL NERVOUS SYSTEM (CNS). THE SIMILARITIES BETWEEN THESE VIRUSES HAVE MADE IT DIFFICULT TO SEPARATE THEM ON SEROLOGICAL LEVEL. THE BROAD TERM HHV-6 REMAINS WHEN REFERRING TO STUDIES WHERE THE TWO SPECIES WERE NOT DISTINGUISHED, AND AS SUCH, THE SEROPREVALENCE IS OVER 90% IN THE ADULT POPULATION. HHV-6B HAS BEEN DETECTED IN UP TO 100% OF INFANTS WITH THE PRIMARY INFECTION ROSEOLA INFANTUM, BUT LESS IS KNOWN ABOUT THE PRIMARY INFECTION OF HHV-6A. BOTH VIRUSES ARE NEUROTROPIC AND HAVE CAPACITY TO ESTABLISH LIFELONG LATENCY IN CELLS OF THE CENTRAL NERVOUS SYSTEM, WITH POTENTIAL TO REACTIVATE AND CAUSE COMPLICATIONS LATER IN LIFE. HHV-6A INFECTION HAS BEEN ASSOCIATED WITH AN INCREASED RISK OF MULTIPLE SCLEROSIS (MS), WHEREAS HHV-6B IS INDICATED TO BE INVOLVED IN PATHOGENESIS OF EPILEPSY. THESE TWO ASSOCIATIONS SHOW HOW NEUROLOGICAL DISEASES MIGHT BE CAUSED BY VIRAL INFECTIONS, BUT AS SUGGESTED HERE, THROUGH COMPLETELY DIFFERENT MOLECULAR MECHANISMS, IN AN AUTOIMMUNE DISEASE, SUCH AS MS, BY TRIGGERING AN OVERREACTION OF THE IMMUNE SYSTEM AND IN EPILEPSY BY HAMPERING INTERNAL CELLULAR FUNCTIONS WHEN THE IMMUNE SYSTEM FAILS TO ELIMINATE THE VIRUS. UNDERSTANDING THE VIRAL MECHANISMS OF PRIMARY INFECTION AND REACTIVATION AND THEIR SPECTRUM OF ASSOCIATED SYMPTOMS WILL AID OUR ABILITY TO DIAGNOSE, TREAT AND PREVENT THESE SEVERE AND CHRONIC DISEASES. THIS REVIEW EXPLORES THE ROLE OF HHV-6A AND HHV-6B SPECIFICALLY IN MS AND EPILEPSY, THE EVIDENCE TO DATE AND THE FUTURE DIRECTIONS OF THIS FIELD. 2020 7 3597 43 IMPLICATIONS OF VIRAL INFECTIONS AND ONCOGENESIS IN UTERINE CERVICAL CARCINOMA ETIOLOGY AND PATHOGENESIS. BACKGROUND: UTERINE CERVICAL CARCINOMA (UCC) IS THE MOST PREVALENT GYNECOLOGICAL MALIGNANCY GLOBALLY, WITH A RISING INCIDENCE IN RECENT YEARS. ACCUMULATING EVIDENCE INDICATES THAT SPECIFIC VIRAL INFECTIONS, INCLUDING HUMAN PAPILLOMAVIRUS (HPV), EPSTEIN-BARR VIRUS (EBV), HEPATITIS B AND C VIRUSES (HBV AND HCV), AND HUMAN HERPESVIRUS (HHV), MAY CONTRIBUTE TO UCC DEVELOPMENT AND PROGRESSION. UNDERSTANDING THE COMPLEX INTERPLAY BETWEEN VIRAL INFECTIONS AND UCC RISK IS CRUCIAL FOR DEVELOPING NOVEL PREVENTATIVE AND THERAPEUTIC INTERVENTIONS. METHODS: THIS COMPREHENSIVE REVIEW INVESTIGATES THE ASSOCIATION BETWEEN VIRAL INFECTIONS AND UCC RISK BY EXAMINING THE ROLES OF VARIOUS VIRAL PATHOGENS IN UCC ETIOLOGY AND PATHOGENESIS, AND POSSIBLE MOLECULAR MECHANISMS. ADDITIONALLY, WE EVALUATE CURRENT DIAGNOSTIC METHODS AND POTENTIAL THERAPEUTIC STRATEGIES TARGETING VIRAL INFECTIONS FOR UCC PREVENTION OR TREATMENT. RESULTS: THE PREVENTION OF UCC HAS BEEN SIGNIFICANTLY ADVANCED BY THE EMERGENCE OF SELF-SAMPLING FOR HPV TESTING AS A CRUCIAL TOOL, ALLOWING FOR EARLY DETECTION AND INTERVENTION. HOWEVER, AN ESSENTIAL CHALLENGE IN UCC PREVENTION LIES IN UNDERSTANDING HOW HPV AND OTHER VIRAL COINFECTIONS, INCLUDING EBV, HBV, HCV, HHV, HIV, OR THEIR CONCURRENT PRESENCE, MAY POTENTIALLY CONTRIBUTE TO UCC DEVELOPMENT. THE MOLECULAR MECHANISMS IMPLICATED IN THE ASSOCIATION BETWEEN VIRAL INFECTIONS AND CERVICAL CANCER DEVELOPMENT INCLUDE: (1) INTERFERENCE OF VIRAL ONCOGENES WITH CELLULAR REGULATORY PROTEINS, RESULTING IN UNCONTROLLED CELL PROLIFERATION AND MALIGNANT TRANSFORMATION; (2) INACTIVATION OF TUMOR SUPPRESSOR GENES BY VIRAL PROTEINS; (3) EVASION OF HOST IMMUNE RESPONSES BY VIRUSES; (4) INDUCTION OF A PERSISTENT INFLAMMATORY RESPONSE, CONTRIBUTING TO A TUMOR-PROMOTING MICROENVIRONMENT; (5) EPIGENETIC MODIFICATIONS THAT LEAD TO ABERRANT GENE EXPRESSION; (6) STIMULATION OF ANGIOGENESIS BY VIRUSES; AND (7) ACTIVATION OF TELOMERASE BY VIRAL PROTEINS, LEADING TO CELLULAR IMMORTALIZATION. ADDITIONALLY, VIRAL COINFECTIONS CAN ALSO ENHANCE ONCOGENIC POTENTIAL THROUGH SYNERGISTIC INTERACTIONS BETWEEN VIRAL ONCOPROTEINS, EMPLOY IMMUNE EVASION STRATEGIES, CONTRIBUTE TO CHRONIC INFLAMMATION, MODULATE HOST CELLULAR SIGNALING PATHWAYS, AND INDUCE EPIGENETIC ALTERATIONS, ULTIMATELY LEADING TO CERVICAL CARCINOGENESIS. CONCLUSION: RECOGNIZING THE IMPLICATIONS OF VIRAL ONCOGENES IN UCC ETIOLOGY AND PATHOGENESIS IS VITAL FOR ADDRESSING THE ESCALATING BURDEN OF UCC. DEVELOPING INNOVATIVE PREVENTATIVE AND THERAPEUTIC INTERVENTIONS REQUIRES A THOROUGH UNDERSTANDING OF THE INTRICATE RELATIONSHIP BETWEEN VIRAL INFECTIONS AND UCC RISK. 2023 8 6706 37 VIRAL GENE PRODUCTS ACTIVELY PROMOTE LATENT INFECTION BY EPIGENETIC SILENCING MECHANISMS. MANY VIRUSES UNDERGO AN ACUTE INFECTION IN THE HOST ORGANISM AND THEN ARE CLEARED BY THE ENSUING HOST IMMUNE RESPONSE, BUT OTHER VIRUSES ESTABLISH A PERSISTENT INFECTION INVOLVING A LATENT INFECTION OR A CHRONIC INFECTION. LATENT INFECTION BY THE HERPESVIRUSES OR HUMAN IMMUNODEFICIENCY VIRUS INVOLVES EPIGENETIC SILENCING OF THE DNA GENOME OR PROVIRAL GENOME, RESPECTIVELY. LATENT INFECTION WAS PREVIOUSLY THOUGHT TO BE A DEFAULT PATHWAY RESULTING FROM INFECTION OF A NONPERMISSIVE CELL, BUT RECENT STUDIES HAVE SHOWN THAT VIRAL GENE PRODUCTS CAN PROMOTE EPIGENETIC SILENCING AND LATENT INFECTION. THIS REVIEW WILL SUMMARIZE THE VIRAL GENE PRODUCTS THAT HAVE BEEN SHOWN TO PROMOTE EPIGENETIC SILENCING OF THE GENOMES AND THEIR POTENTIAL FOR THERAPEUTICS TO TARGET THESE VIRAL GENE PRODUCTS AND DISRUPT OR LOCK IN LATENT INFECTION. 2017 9 3529 45 ILLUMINATING THE LIVE-CELL DYNAMICS OF HEPATITIS B VIRUS COVALENTLY CLOSED CIRCULAR DNA USING THE CRISPR-TAG SYSTEM. THE COVALENTLY CLOSED CIRCULAR DNA (CCCDNA) OF HEPATITIS B VIRUS (HBV) IS THE MAJOR OBSTACLE TO CURING CHRONIC HEPATITIS B (CHB). CURRENT CCCDNA DETECTION METHODS ARE MOSTLY BASED ON BIOCHEMICAL EXTRACTION AND BULK MEASUREMENTS. THEY NEVERTHELESS GENERATED A GENERAL SKETCH OF ITS BIOLOGICAL FEATURES. HOWEVER, AN UNDERSTANDING OF THE SPATIOTEMPORAL FEATURES OF CCCDNA IS STILL LACKING. TO ACHIEVE THIS, WE ESTABLISHED A SYSTEM COMBINING CRISPR-TAG AND RECOMBINANT HBV MINICIRCLE TECHNOLOGY TO VISUALIZE CCCDNA AT SINGLE-CELL LEVEL IN REAL TIME. USING THIS SYSTEM, WE FOUND THAT THE OBSERVED RECOMBINANT CCCDNA (RCCCDNA) CORRELATED QUANTITATIVELY WITH ITS ACTIVE TRANSCRIPTS WHEN A LOW TO MEDIUM NUMBER OF FOCI (<20) ARE PRESENT, BUT THIS CORRELATION WAS LOST IN CELLS HARBORING HIGH COPY NUMBERS (>/=20) OF RCCCDNA. THE DISRUPTION OF HBX EXPRESSION SEEMS TO DISPLACE CCCDNA FROM THE DCAS9-ACCESSIBLE REGION, WHILE HBX COMPLEMENTATION RESTORED THE NUMBER OF OBSERVABLE CCCDNA FOCI. THIS INDICATED REGULATION OF CCCDNA ACCESSIBILITY BY HBX. SECOND, OBSERVABLE HBV AND DUCK HBV (DHBV) CCCDNA MOLECULES ARE SUBSTANTIALLY LOST DURING CELL DIVISION, AND THE REMAINING ONES WERE DISTRIBUTED RANDOMLY TO DAUGHTER CELLS. IN CONTRAST, KAPOSI'S SARCOMA-ASSOCIATED HERPESVIRUS (KSHV)-DERIVED EPISOMES CAN BE RETAINED IN A LANA (LATENCY-ASSOCIATED NUCLEAR ANTIGEN)-DEPENDENT MANNER. LAST, THE DYNAMICS OF RCCCDNA EPISOMES IN NUCLEI DISPLAYED CONFINED DIFFUSION AT SHORT TIME SCALES, WITH DIRECTIONAL TRANSPORT OVER LONGER TIME SCALES. IN CONCLUSION, THIS SYSTEM ENABLES THE STUDY OF PHYSIOLOGICAL KINETICS OF CCCDNA AT THE SINGLE-CELL LEVEL. THE DIFFERENTIAL ACCESSIBILITY OF RCCCDNA TO DCAS9 UNDER VARIOUS PHYSIOLOGICAL CONDITIONS MAY BE EXPLOITED TO ELUCIDATE THE COMPLEX TRANSCRIPTIONAL AND EPIGENETIC REGULATION OF THE HBV MINICHROMOSOME. IMPORTANCE UNDERSTANDING THE FORMATION AND MAINTENANCE OF HBV CCCDNA HAS ALWAYS BEEN A CENTRAL ISSUE IN THE STUDY OF HBV PATHOBIOLOGY. HOWEVER, LITTLE PROGRESS HAS BEEN MADE DUE TO THE LACK OF ROBUST ASSAY SYSTEMS AND ITS RESISTANCE TO GENETIC MODIFICATION. HERE, A LIVE-CELL IMAGING SYSTEM BY GRAFTING CRISPR-TAG INTO THE RECOMBINANT CCCDNA WAS ESTABLISHED TO VISUALIZE ITS MOLECULAR BEHAVIOR IN REAL TIME. WE FOUND THAT THE ACCESSIBILITY OF RCCCDNA TO DCAS9-BASED IMAGING IS RELATED TO HBX-REGULATED MECHANISMS. WE ALSO CONFIRMED THE SUBSTANTIAL LOSS OF OBSERVABLE RCCCDNA IN ONE-ROUND CELL DIVISION AND RANDOM DISTRIBUTION OF THE REMAINING MOLECULES. MOLECULAR DYNAMICS ANALYSIS REVEALED THE CONFINED MOVEMENT OF THE RCCCDNA EPISOME, SUGGESTING ITS JUXTAPOSITION TO CHROMATIN DOMAINS. OVERALL, THIS NOVEL SYSTEM OFFERS A UNIQUE PLATFORM TO INVESTIGATE THE INTRANUCLEAR DYNAMICS OF CCCDNA WITHIN LIVE CELLS. 2023 10 1006 51 CHRONIC VIRAL INFECTION AND PRIMARY CENTRAL NERVOUS SYSTEM MALIGNANCY. PRIMARY CENTRAL NERVOUS SYSTEM (CNS) TUMORS CAUSE SIGNIFICANT MORBIDITY AND MORTALITY IN BOTH ADULTS AND CHILDREN. WHILE SOME OF THE GENETIC AND MOLECULAR MECHANISMS OF NEURO-ONCOGENESIS ARE KNOWN, MUCH LESS IS KNOWN ABOUT POSSIBLE EPIGENETIC CONTRIBUTIONS TO DISEASE PATHOPHYSIOLOGY. OVER THE LAST SEVERAL DECADES, CHRONIC VIRAL INFECTIONS HAVE BEEN ASSOCIATED WITH A NUMBER OF HUMAN MALIGNANCIES. IN PRIMARY CNS MALIGNANCIES, TWO FAMILIES OF VIRUSES, NAMELY POLYOMAVIRUS AND HERPESVIRUS, HAVE BEEN DETECTED WITH VARIED FREQUENCIES IN A NUMBER OF PEDIATRIC AND ADULT HISTOLOGICAL TUMOR SUBTYPES. HOWEVER, ESTABLISHING A LINK BETWEEN CHRONIC VIRAL INFECTION AND PRIMARY CNS MALIGNANCY HAS BEEN AN AREA OF CONSIDERABLE CONTROVERSY, DUE IN PART TO VARIATIONS IN DETECTION FREQUENCIES AND METHODOLOGIES USED AMONG RESEARCHERS. SINCE A LATENT VIRAL NEUROTROPISM CAN BE SEEN WITH A VARIETY OF VIRUSES AND A WIDESPREAD SEROPOSITIVITY EXISTS AMONG THE POPULATION, IT HAS BEEN DIFFICULT TO ESTABLISH AN ASSOCIATION BETWEEN VIRAL INFECTION AND CNS MALIGNANCY BASED ON EPIDEMIOLOGY ALONE. WHILE DIRECT EVIDENCE OF A ROLE OF VIRUSES IN NEURO-ONCOGENESIS IN HUMANS IS LACKING, A MORE PLAUSIBLE HYPOTHESIS OF NEURO-ONCOMODULATION HAS BEEN PROPOSED. THE OVERALL GOALS OF THIS REVIEW ARE TO SUMMARIZE THE MANY HUMAN INVESTIGATIONS THAT HAVE STUDIED VIRAL INFECTION IN PRIMARY CNS TUMORS, DISCUSS POTENTIAL NEURO-ONCOMODULATORY MECHANISMS OF VIRAL-ASSOCIATED CNS DISEASE AND PROPOSE FUTURE RESEARCH DIRECTIONS TO ESTABLISH A MORE FIRM ASSOCIATION BETWEEN CHRONIC VIRAL INFECTIONS AND PRIMARY CNS MALIGNANCIES. 2010 11 4430 40 MOLECULAR BIOLOGY OF ONCOGENIC INFLAMMATORY PROCESSES. I. NON-ONCOGENIC AND ONCOGENIC PATHOGENS, INTRINSIC INFLAMMATORY REACTIONS WITHOUT PATHOGENS, AND MICRORNA/DNA INTERACTIONS (REVIEW). IN SOME INFLAMMASOMES TUMOR CELLS ARE GENERATED. THE INTERNAL ENVIRONMENT OF THE INFLAMMASOME IS CONDUCIVE TO THE INDUCTION OF MALIGNANT TRANSFORMATION. EPIGENETIC CHANGES INITIATE THIS PROCESS. THE SUBVERTED STROMAL CONNECTIVE TISSUE CELLS ACT TO PROMOTE AND SUSTAIN THE PROCESS OF MALIGNANT TRANS-FORMATION. IN ITS EARLY STAGES, THE PREMALIGNANT CELLS DEPEND ON PARACRINE CIRCUITRIES FOR THE RECEPTION OF GROWTH FACTORS. THE LIGANDS ARE DERIVED FROM THE CONNECTIVE TISSUE, AND THE RECEPTORS ARE EXPRESSED ON THE RECIPIENT PREMALIGNANT CELLS. THE INITIAL EVENTS ARE NOT A DIRECT ATTACK ON THE PROTO-ONCOGENES, AND THUS IT MAY BE ENTIRELY REVERSIBLE. EPIGENETIC PROCESSES OF HYPERMETHYLATION OF THE GENES AT THE PROMOTERS OF TUMOR SUPPRESSOR GENES (TO SILENCE THEM), AND DEACETYLATION OF THE HISTONES AIMED AT THE PROMOTERS OF PROTO-ONCOGENES (TO ACTIVATE THEM) ARE ON-GOING. A LARGE NUMBER OF SHORT RNA SEQUENCES (INTERFERING, MICRO-, SHORT HAIRPIN, NON-CODING RNAS) SILENCE TUMOR SUPPRESSOR GENES, BY NEUTRALIZING THEIR MRNAS. IN A SERIAL SEQUENCE ONCOGENES UNDERGO AMPLIFICATIONS, POINT-MUTATIONS, TRANSLOCATIONS AND FUSIONS. IN ITS EARLIEST STAGE, THE PROCESS IS REVERSIBLE BY DEMETHYLATION OF THE SILENCED SUPPRESSOR GENE PROMOTERS (TO REACTIVATE THEM), OR RE-ACETYLATION OF THE HISTONES OF THE ONCOGENE PROMOTERS, THUS DE-ACTIVATING THEM. THE EXTERNAL ADMINISTRATION OF HISTONE DEACETYLASE INHIBITORS USUALLY LEADS TO THE RESTORATION OF HISTONE ACETYLATION. IN TIME, THE UNCORRECTED PROCESSES SOLIDIFY INTO CONSTITUTIVE AND IRREVERSIBLE GENE MUTATIONS. SOME OF THE PATHOGENS INDUCING INFLAMMATIONS WITH CONSQUENTIAL MALIGNANT TRANSFORMATION CONTAIN ONCOGENIC GENE SEQUENCES (PAPILLOMA VIRUSES, EPSTEIN-BARR VIRUS, KAPOSI'S SARCOMA-ASSOCIATED HERPESVIRUS, HEPATITIS B AND C VIRUSES, MERKEL CELL POLYOMA VIRUS, HELICOBACTER PYLORI, ENTEROTOXIGENIC BACTEROIDES FRAGILIS). THESE INDUCED MALIGNANCIES MAY BE MULTIFOCAL. OTHER PATHOGENS ARE DEVOID OF ANY KNOWN ONCOGENIC GENOMIC SEQUENCES (MYCOPLASMA VAV-CARCINOGENESIS, CHLAMYDIA MALT-LYMPHOMA GENESIS). IN THESE CASES THE HOST'S INFLAMMATORY REACTIONS INDUCE THE MALIGNANT TRANSFORMATION IN SERIAL SEQUENCES OF GENE ALTERATIONS INITIATED BY HYPOXIA AND REACTIVE OXYGEN AND NITROGEN SPECIES GENERATION. CARCINOGENIC INTRINSIC INFLAMMATORY PROCESSES ENDOGENOUSLY INITIATED WITHOUT A PATHOGEN ARE RECOGNIZED. CHRONIC INFLAMMATORY PROCESSES SIGNAL THE RNA/DNA COMPLEX. IN RESPONSE, THE DNA MAY REVERT INTO ITS ANCIENT PRIMORDIAL 'IMMORTAL' FORMAT, WHICH THE CLINICS RECOGNIZE AS 'ONCOGENESIS'. THE DNA REMAINS THE ULTIMATE MASTER OF BIOENGINEERING IN ORDER TO SUSTAIN LIFE. A DISCUSSION ON THE MOST VERSATILE AND RESISTANT PRIMORDIAL RNA/DNA COMPLEX AND THE PRE-, PROTO-, AND UNICELLULAR WORLD IN WHICH THEY CO-EXISTED IS INCLUDED. 2012 12 4816 36 OCCULT HEPATITIS B VIRUS INFECTION: A COMPLEX ENTITY WITH RELEVANT CLINICAL IMPLICATIONS. OCCULT HEPATITIS B VIRUS (HBV) INFECTION IS A WORLD-WIDE ENTITY, FOLLOWING THE GEOGRAPHICAL DISTRIBUTION OF DETECTABLE HEPATITIS B. THIS ENTITY IS DEFINED AS THE PERSISTENCE OF VIRAL GENOMES IN THE LIVER TISSUE AND IN SOME INSTANCES ALSO IN THE SERUM, ASSOCIATED TO NEGATIVE HBV SURFACE ANTIGEN SEROLOGY. THE MOLECULAR BASIS OF THE OCCULT INFECTION IS RELATED TO THE LIFE CYCLE OF HBV, WHICH PRODUCES A COVALENTLY CLOSED CIRCULAR DNA THAT PERSISTS IN THE CELL NUCLEI AS AN EPISOME, AND SERVES AS A TEMPLATE FOR GENE TRANSCRIPTION. THE MECHANISM RESPONSIBLE FOR THE HBSAG NEGATIVE STATUS IN OCCULT HBV CARRIERS IS A STRONG SUPPRESSION OF VIRAL REPLICATION, PROBABLY DUE TO THE HOST'S IMMUNE RESPONSE, CO-INFECTION WITH OTHER INFECTIOUS AGENTS AND EPIGENETIC FACTORS. THERE IS EMERGING EVIDENCE OF THE POTENTIAL CLINICAL RELEVANCE OF OCCULT HBV INFECTION, SINCE THIS COULD BE INVOLVED IN OCCULT HBV TRANSMISSION THROUGH ORTHOTOPIC LIVER TRANSPLANT AND BLOOD TRANSFUSION, REACTIVATION OF HBV INFECTION DURING IMMUNOSUPPRESSION, IMPAIRING CHRONIC LIVER DISEASE OUTCOME AND ACTING AS A RISK FACTOR FOR HEPATOCELLULAR CARCINOMA. THEREFORE IT IS IMPORTANT TO BEAR IN MIND THIS ENTITY IN CRYPTOGENETIC LIVER DISEASES, HEPATITIS C VIRUS/HIV INFECTED PATIENTS AND IMMUNOSUPRESSED INDIVIDUALS. IT IS ALSO NECESSARY TO INCREASE OUR KNOWLEDGE IN THIS FASCINATING FIELD TO DEFINE BETTER STRATEGIES TO DIAGNOSE AND TREAT THIS INFECTION. 2011 13 2663 34 EPSTEIN-BARR VIRUS PROMOTES B CELL LYMPHOMAS BY MANIPULATING THE HOST EPIGENETIC MACHINERY. DURING THE PAST DECADE, THE RAPID DEVELOPMENT OF HIGH-THROUGHPUT NEXT-GENERATION SEQUENCING TECHNOLOGIES HAS SIGNIFICANTLY REINFORCED OUR UNDERSTANDING OF THE ROLE OF EPIGENETICS IN HEALTH AND DISEASE. ALTERED FUNCTIONS OF EPIGENETIC MODIFIERS LEAD TO THE DISRUPTION OF THE HOST EPIGENOME, ULTIMATELY INDUCING CARCINOGENESIS AND DISEASE PROGRESSION. EPSTEIN-BARR VIRUS (EBV) IS AN ENDEMIC HERPESVIRUS THAT IS ASSOCIATED WITH SEVERAL MALIGNANT TUMOURS, INCLUDING B-CELL RELATED LYMPHOMAS. IN EBV-INFECTED CELLS, THE EPIGENOMIC LANDSCAPE IS EXTENSIVELY RESHAPED BY VIRAL ONCOPROTEINS, WHICH DIRECTLY INTERACT WITH EPIGENETIC MODIFIERS AND MODULATE THEIR FUNCTION. THIS PROCESS IS FUNDAMENTAL FOR THE EBV LIFE CYCLE, PARTICULARLY FOR THE ESTABLISHMENT AND MAINTENANCE OF LATENCY IN B CELLS; HOWEVER, THE ALTERATION OF THE HOST EPIGENETIC MACHINERY ALSO CONTRIBUTES TO THE DYSREGULATED EXPRESSION OF SEVERAL CELLULAR GENES, INCLUDING TUMOUR SUPPRESSOR GENES, WHICH CAN DRIVE LYMPHOMA DEVELOPMENT. THIS REVIEW OUTLINES THE MOLECULAR MECHANISMS UNDERLYING THE EPIGENETIC MANIPULATION INDUCED BY EBV THAT LEAD TO TRANSFORMED B CELLS, AS WELL AS NOVEL THERAPEUTIC INTERVENTIONS TO TARGET EBV-ASSOCIATED B-CELL LYMPHOMAS. 2020 14 5689 38 SILENCING HEPATITIS B VIRUS COVALENTLY CLOSED CIRCULAR DNA: THE POTENTIAL OF AN EPIGENETIC THERAPY APPROACH. GLOBAL PROPHYLACTIC VACCINATION PROGRAMMES HAVE HELPED TO CURB NEW HEPATITIS B VIRUS (HBV) INFECTIONS. HOWEVER, IT IS ESTIMATED THAT NEARLY 300 MILLION PEOPLE ARE CHRONICALLY INFECTED AND HAVE A HIGH RISK OF DEVELOPING HEPATOCELLULAR CARCINOMA. AS SUCH, HBV REMAINS A SERIOUS HEALTH PRIORITY AND THE DEVELOPMENT OF NOVEL CURATIVE THERAPEUTICS IS URGENTLY NEEDED. CHRONIC HBV INFECTION HAS BEEN ATTRIBUTED TO THE PERSISTENCE OF THE COVALENTLY CLOSED CIRCULAR DNA (CCCDNA) WHICH ESTABLISHES ITSELF AS A MINICHROMOSOME IN THE NUCLEUS OF HEPATOCYTES. AS THE VIRAL TRANSCRIPTION INTERMEDIATE, THE CCCDNA IS RESPONSIBLE FOR PRODUCING NEW VIRIONS AND PERPETUATING INFECTION. HBV IS DEPENDENT ON VARIOUS HOST FACTORS FOR CCCDNA FORMATION AND THE MINICHROMOSOME IS AMENABLE TO EPIGENETIC MODIFICATIONS. TWO HBV PROTEINS, X (HBX) AND CORE (HBC) PROMOTE VIRAL REPLICATION BY MODULATING THE CCCDNA EPIGENOME AND REGULATING HOST CELL RESPONSES. THIS INCLUDES VIRAL AND HOST GENE EXPRESSION, CHROMATIN REMODELING, DNA METHYLATION, THE ANTIVIRAL IMMUNE RESPONSE, APOPTOSIS, AND UBIQUITINATION. ELIMINATION OF THE CCCDNA MINICHROMOSOME WOULD RESULT IN A STERILIZING CURE; HOWEVER, THIS MAY BE DIFFICULT TO ACHIEVE. EPIGENETIC THERAPIES COULD PERMANENTLY SILENCE THE CCCDNA MINICHROMOSOME AND PROMOTE A FUNCTIONAL CURE. THIS REVIEW EXPLORES THE CCCDNA EPIGENOME, HOW HOST AND VIRAL FACTORS INFLUENCE TRANSCRIPTION, AND THE RECENT EPIGENETIC THERAPIES AND EPIGENOME ENGINEERING APPROACHES THAT HAVE BEEN DESCRIBED. 2021 15 1026 37 CIRCULATING MIRNAS EXPRESSION IN MYALGIC ENCEPHALOMYELITIS/CHRONIC FATIGUE SYNDROME. MYALGIC ENCEPHALOMYELITIS/CHRONIC FATIGUE SYNDROME (ME/CFS) IS A COMPLEX MULTIFACTORIAL DISEASE THAT CAUSES INCREASING MORBIDITY WORLDWIDE, AND MANY INDIVIDUALS WITH ME/CFS SYMPTOMS REMAIN UNDIAGNOSED DUE TO THE LACK OF DIAGNOSTIC BIOMARKERS. ITS ETIOLOGY IS STILL UNKNOWN, BUT INCREASING EVIDENCE SUPPORTS A ROLE OF HERPESVIRUSES (INCLUDING HHV-6A AND HHV-6B) AS POTENTIAL TRIGGERS. INTERESTINGLY, THE INFECTION BY THESE VIRUSES HAS BEEN REPORTED TO IMPACT THE EXPRESSION OF MICRORNAS (MIRNAS), SHORT NON-CODING RNA SEQUENCES WHICH HAVE BEEN SUGGESTED TO BE EPIGENETIC FACTORS MODULATING ME/CFS PATHOGENIC MECHANISMS. NOTABLY, THE PRESENCE OF CIRCULATING MIRNAS IN PLASMA HAS RAISED THE POSSIBILITY TO USE THEM AS VALUABLE BIOMARKERS FOR DISTINGUISHING ME/CFS PATIENTS FROM HEALTHY CONTROLS. THUS, THIS STUDY AIMED AT DETERMINING THE ROLE OF EIGHT MIRNAS, WHICH WERE SELECTED FOR THEIR PREVIOUS ASSOCIATION WITH ME/CFS, AS POTENTIAL CIRCULATING BIOMARKERS OF THE DISEASE. THEIR PRESENCE WAS QUANTITATIVELY EVALUATED IN PLASMA FROM 40 ME/CFS PATIENTS AND 20 HEALTHY CONTROLS BY SPECIFIC TAQMAN ASSAYS, AND THE RESULTS SHOWED THAT SIX OUT OF THE EIGHT OF THE SELECTED MIRNAS WERE DIFFERENTLY EXPRESSED IN PATIENTS COMPARED TO CONTROLS; MORE SPECIFICALLY, FIVE MIRNAS WERE SIGNIFICANTLY UPREGULATED (MIR-127-3P, MIR-142-5P, MIR-143-3P, MIR-150-5P, AND MIR-448), AND ONE WAS DOWNMODULATED (MIR-140-5P). MIRNA LEVELS DIRECTLY CORRELATED WITH DISEASE SEVERITY, WHEREAS NO SIGNIFICANT CORRELATIONS WERE OBSERVED WITH THE PLASMA LEVELS OF SEVEN PRO-INFLAMMATORY CYTOKINES OR WITH THE PRESENCE/LOAD OF HHV-6A/6B GENOME, AS JUDGED BY SPECIFIC PCR AMPLIFICATION. THE RESULTS MAY OPEN THE WAY FOR FURTHER VALIDATION OF MIRNAS AS NEW POTENTIAL BIOMARKERS IN ME/CFS AND INCREASE THE KNOWLEDGE OF THE COMPLEX PATHWAYS INVOLVED IN THE ME/CFS DEVELOPMENT. 2023 16 2240 38 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 17 5368 30 RECENT ADVANCES IN THE STUDY OF HEPATITIS B VIRUS COVALENTLY CLOSED CIRCULAR DNA. CHRONIC HEPATITIS B INFECTION IS CAUSED BY HEPATITIS B VIRUS (HBV) AND A TOTAL CURE IS YET TO BE ACHIEVED. THE VIRAL COVALENTLY CLOSED CIRCULAR DNA (CCCDNA) IS THE KEY TO ESTABLISH A PERSISTENT INFECTION WITHIN HEPATOCYTES. CURRENT ANTIVIRAL STRATEGIES HAVE NO EFFECT ON THE PRE-EXISTING CCCDNA RESERVOIR. THEREFORE, THE STUDY OF THE MOLECULAR MECHANISM OF CCCDNA FORMATION IS BECOMING A MAJOR FOCUS OF HBV RESEARCH. THIS REVIEW SUMMARIZES THE CURRENT ADVANCES IN CCCDNA MOLECULAR BIOLOGY AND THE LATEST STUDIES ON THE ELIMINATION OR INACTIVATION OF CCCDNA, INCLUDING THREE MAJOR AREAS: (1) EPIGENETIC REGULATION OF CCCDNA BY HBV X PROTEIN, (2) IMMUNE-MEDIATED DEGRADATION, AND (3) GENOME-EDITING NUCLEASES. ALL THESE ASPECTS PROVIDE CLUES ON HOW TO FINALLY ATTAIN A CURE FOR CHRONIC HEPATITIS B INFECTION. 2017 18 5936 26 TARGETING HEPATITIS B VIRUS COVALENTLY CLOSED CIRCULAR DNA AND HEPATITIS B VIRUS X PROTEIN: RECENT ADVANCES AND NEW APPROACHES. CHRONIC HEPATITIS B VIRUS (HBV) INFECTION REMAINS A WORLDWIDE CONCERN AND PUBLIC HEALTH PROBLEM. TWO KEY ASPECTS OF THE HBV LIFE CYCLE ARE ESSENTIAL FOR VIRAL REPLICATION AND THUS THE DEVELOPMENT OF CHRONIC INFECTIONS: THE ESTABLISHMENT OF THE VIRAL MINICHROMOSOME, COVALENTLY CLOSED CIRCULAR (CCC) DNA, WITHIN THE NUCLEUS OF INFECTED HEPATOCYTES AND THE EXPRESSION OF THE REGULATORY HEPATITIS B VIRUS X PROTEIN (HBX). INTERESTINGLY, NUCLEAR HBX REDIRECTS HOST EPIGENETIC MACHINERY TO ACTIVATE CCCDNA TRANSCRIPTION. IN THIS PERSPECTIVE, WE PROVIDE AN OVERVIEW OF RECENT ADVANCES IN UNDERSTANDING THE REGULATION OF CCCDNA AND THE MECHANISTIC AND FUNCTIONAL ROLES OF HBX. WE ALSO DESCRIBE THE PROGRESS TOWARD TARGETING BOTH CCCDNA AND HBX FOR THERAPEUTIC PURPOSES. FINALLY, WE OUTLINE STANDING QUESTIONS IN THE FIELD AND PROPOSE COMPLEMENTARY CHEMICAL BIOLOGY APPROACHES TO ADDRESS THEM. 2019 19 4815 37 OCCULT HEPATITIS B INFECTION AND HEPATOCELLULAR CARCINOMA: EPIDEMIOLOGY, VIROLOGY, HEPATOCARCINOGENESIS AND CLINICAL SIGNIFICANCE. OCCULT HEPATITIS B INFECTION (OBI) REFERS TO A CONDITION WHERE REPLICATION-COMPETENT HBV DNA IS PRESENT IN THE LIVER, WITH OR WITHOUT HBV DNA IN THE BLOOD, IN INDIVIDUALS WITH SERUM HBSAG NEGATIVITY ASSESSED BY CURRENTLY AVAILABLE ASSAYS. THE EPISOMAL COVALENTLY CLOSED CIRCULAR DNA (CCCDNA) IN OBI IS IN A LOW REPLICATIVE STATE. VIRAL GENE EXPRESSION IS MEDIATED BY EPIGENETIC CONTROL OF HBV TRANSCRIPTION, INCLUDING THE HBV CPG ISLAND METHYLATION PATHWAY AND POST-TRANSLATIONAL MODIFICATION OF CCCDNA-BOUND HISTONE, WITH A DIFFERENT PATTERN FROM PATIENTS WITH CHRONIC HBV INFECTION. THE PREVALENCE OF OBI VARIES TREMENDOUSLY ACROSS PATIENT POPULATIONS OWING TO NUMEROUS FACTORS, SUCH AS GEOGRAPHIC LOCATION, ASSAY CHARACTERISTICS, HOST IMMUNE RESPONSE, COINFECTION WITH OTHER VIRUSES, AND VACCINATION STATUS. APART FROM THE RISK OF VIRAL REACTIVATION UPON IMMUNOSUPPRESSION AND THE RISK OF TRANSMISSION OF HBV, OBI HAS BEEN IMPLICATED IN HEPATOCELLULAR CARCINOMA (HCC) DEVELOPMENT IN PATIENTS WITH CHRONIC HCV INFECTION, THOSE WITH CRYPTOGENIC OR KNOWN LIVER DISEASE, AND IN PATIENTS WITH HBSAG SEROCLEARANCE AFTER CHRONIC HBV INFECTION. AN INCREASING NUMBER OF PROSPECTIVE STUDIES AND META-ANALYSES HAVE REPORTED A HIGHER INCIDENCE OF HCC IN PATIENTS WITH HCV AND OBI, AS WELL AS MORE ADVANCED TUMOUR HISTOLOGICAL GRADES AND EARLIER AGE OF HCC DIAGNOSIS, COMPARED WITH PATIENTS WITHOUT OBI. THE PROPOSED PATHOGENETIC MECHANISMS OF OBI-RELATED HCC INCLUDE THE INFLUENCE OF HBV DNA INTEGRATION ON THE HEPATOCYTE CELL CYCLE, THE PRODUCTION OF PRO-ONCOGENIC PROTEINS (HBX PROTEIN AND MUTATED SURFACE PROTEINS), AND PERSISTENT LOW-GRADE NECROINFLAMMATION (CONTRIBUTING TO THE DEVELOPMENT OF FIBROSIS AND CIRRHOSIS). THERE REMAIN UNCERTAINTIES ABOUT EXACTLY HOW, AND IN WHAT ORDER, THESE MECHANISMS DRIVE THE DEVELOPMENT OF TUMOURS IN PATIENTS WITH OBI. 2020 20 3401 24 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