1 2520 95 EPIGENETICS AND THE GLUCOCORTICOID RECEPTOR: A REVIEW OF THE IMPLICATIONS IN DEPRESSION. DEPRESSION IS A SERIOUS PSYCHIATRIC DISORDER THAT EFFECTS AT LEAST 350 MILLION PEOPLE WORLDWIDE TODAY. DYSREGULATION OF THE HYPOTHALAMIC-PITUITARY-ADRENAL AXIS (HPAA) IS A ROBUST FINDING IN THE PATHOPHYSIOLOGY OF DEPRESSION. THIS DYSREGULATION IS HYPOTHESIZED TO RESULT FROM ALTERED CENTRAL GLUCOCORTICOID RECEPTOR (GR) LEVELS AND/OR FUNCTION AS A CONSEQUENCE OF CHRONIC GLUCOCORTICOID (GC) RELEASE, LEADING TO RECEPTOR RESISTANCE. PIVOTAL ANIMAL AND HUMAN RESEARCH TO DATE HAS IDENTIFIED THAT EARLY LIFE EXPOSURE TO PROLONGED LEVELS OF GCS, STRESS AND/OR DEPRESSION, CAN INDUCE EPIGENETIC MODIFICATIONS AT KEY REGIONS ON THE GR GENE THAT LEAD TO ALTERATIONS IN GR EXPRESSION AND FUNCTION. EPIGENETICS PROVIDES AN ATTRACTIVE MECHANISM TO EXPLAIN HOW ONES' GENES AND ENVIRONMENT CAN INTERACT TO PRODUCE DIFFERENT DISEASE PHENOTYPES. THIS REVIEW AIMS TO COMPILE THE INFORMATION THAT HAS BEEN COLLECTED TO DATE AND TO IDENTIFY KEY AREAS FOR FURTHER INVESTIGATION. 2016 2 6228 25 THE LINKS BETWEEN STRESS AND DEPRESSION: PSYCHONEUROENDOCRINOLOGICAL, GENETIC, AND ENVIRONMENTAL INTERACTIONS. THE ROLE OF STRESS IN THE ORIGIN AND DEVELOPMENT OF DEPRESSION MAY BE CONCEIVED AS THE RESULT OF MULTIPLE CONVERGING FACTORS, INCLUDING THE CHRONIC EFFECT OF ENVIRONMENTAL STRESSORS AND THE LONG-LASTING EFFECTS OF STRESSFUL EXPERIENCES DURING CHILDHOOD, ALL OF WHICH MAY INDUCE PERSISTENT HYPERACTIVITY OF THE HYPOTHALAMIC-PITUITARY-ADRENAL AXIS. THESE CHANGES, INCLUDING INCREASED AVAILABILITY OF CORTICOTROPIN-RELEASING FACTOR AND CORTISOL, ARE ALSO ASSOCIATED WITH HYPERACTIVITY OF THE AMYGDALA, HYPOACTIVITY OF THE HIPPOCAMPUS, AND DECREASED SEROTONERGIC NEUROTRANSMISSION, WHICH TOGETHER RESULT IN INCREASED VULNERABILITY TO STRESS. THE ROLE OF OTHER MONOAMINERGIC NEUROTRANSMITTERS, GENETIC POLYMORPHISMS, EPIGENETIC MECHANISMS, INFLAMMATORY PROCESSES, AND ALTERED COGNITIVE PROCESSING HAS ALSO BEEN CONSIDERED IN THE DEVELOPMENT OF A COMPREHENSIVE MODEL OF THE INTERACTIONS BETWEEN DIFFERENT FACTORS OF VULNERABILITY. FURTHER UNDERSTANDING OF THE UNDERLYING MECHANISMS THAT LINK THESE FACTORS MAY CONTRIBUTE SIGNIFICANTLY TO THE DEVELOPMENT OF MORE EFFECTIVE TREATMENTS AND PREVENTIVE STRATEGIES IN THE INTERFACE BETWEEN STRESS AND MOOD DISORDERS. 2016 3 291 36 AGING AND STRESS: PAST HYPOTHESES, PRESENT APPROACHES AND PERSPECTIVES. BRAIN AGING HAS BEEN SUGGESTED TO BE CONDITIONED BY AN EXCESSIVE GLUCOCORTIOID SECRETION LEADING TO DAMAGES ON BRAIN AREAS INVOLVED NOT ONLY IN COGNITIVE AND EMOTIONAL PROCESSES BUT ALSO IN THE CONTROL OF THE ACTIVITY OF THE HYPOTHALAMIC-PITUITARY ADRENAL AXIS. THIS REVIEW DESCRIBES SOME OF THE HYPOTHESIS THAT TRY TO EXPLAIN THE RELATION BETWEEN THE DYSREGULATION OF THE STRESS RESPONSE AND BRAIN AGING, FOCUSING ON CORTICOSTERONE BUT ALSO ON NEUROTRANSMISSION IN THE HIPPOCAMPUS, THE PREFRONTAL CORTEX AND THE AMYGDALA. MOREOVER, DIFFERENT MOLECULAR FACTORS CAN ACCOUNT FOR AN ENHANCED VULNERABILITY OF THE AGED BRAIN TO STRESS EXPOSURE, SPECIALLY FOR RESILIENCE. AMONG THEM, GOOD CANDIDATES COULD BE THOSE MECHANISMS DETERMINING THE LEVELS OF CORTICOSTERONE IN THE BRAIN, SEVERAL MOLECULES DOWNSTREAM GLUCOCORTICOID RECEPTOR ACTIVATION (IE: HEAT SHOCK PROTEINS, BAG-1) OR EVEN THE EPIGENETIC PROGRAMMING OF THE HPA AXIS IN EARLY STAGES. IN CONCLUSION, GENETIC AND ENVIRONMENTAL FACTORS (EARLY LIFE STRESS, CHRONIC STRESS DURING ADULTHOOD) CAN PRODUCE AN ENHANCED VULNERABILITY AND A REDUCED RESILIENCE OF THE BRAIN TO SUBSEQUENT STRESS EXPOSURES OR TO METABOLIC CHALLENGES LEADING, IN TURN, TO AN UNSUCCESSFUL AGING OF THE BRAIN. HOWEVER, RESULTS OBTAINED WITH THE USE OF THE ENVIRONMENTAL ENRICHMENT MODEL IN ANIMALS, ADDED TO SEVERAL RESULTS IN HUMANS ALSO DESCRIBED IN THIS REVIEW SUGGEST THAT POSITIVE ENVIRONMENTAL FACTORS (COGNITIVE-DEMANDING TASKS OR PHYSICAL EXERCISE) CAN HELP TO MAINTAIN NEURONAL PLASTICITY DURING AGING AND TO PROTECT THE BRAIN AGAINST THE DAMAGING EFFECTS OF STRESS EXPOSURE. 2011 4 997 30 CHRONIC STRESS-DRIVEN GLUCOCORTICOID RECEPTOR ACTIVATION PROGRAMS KEY CELL PHENOTYPES AND FUNCTIONAL EPIGENOMIC PATTERNS IN HUMAN FIBROBLASTS. CHRONIC ENVIRONMENTAL STRESS CAN PROFOUNDLY IMPACT CELL AND BODY FUNCTION. ALTHOUGH THE UNDERLYING MECHANISMS ARE POORLY UNDERSTOOD, EPIGENETICS HAS EMERGED AS A KEY LINK BETWEEN ENVIRONMENT AND HEALTH. THE GENOMIC EFFECTS OF STRESS ARE THOUGHT TO BE MEDIATED BY THE ACTION OF GLUCOCORTICOID STRESS HORMONES, PRIMARILY CORTISOL IN HUMANS, WHICH ACT VIA THE GLUCOCORTICOID RECEPTOR (GR). TO DISSECT HOW CHRONIC STRESS-DRIVEN GR ACTIVATION INFLUENCES EPIGENETIC AND CELL STATES, HUMAN FIBROBLASTS UNDERWENT PROLONGED EXPOSURE TO PHYSIOLOGICAL STRESS LEVELS OF CORTISOL AND/OR A SELECTIVE GR ANTAGONIST. CORTISOL WAS FOUND TO DRIVE ROBUST CHANGES IN CELL PROLIFERATION, MIGRATION, AND MORPHOLOGY, WHICH WERE ABROGATED BY CONCOMITANT GR BLOCKADE. THE GR-DRIVEN CELL PHENOTYPES WERE ACCOMPANIED BY WIDESPREAD, YET GENOMIC CONTEXT-DEPENDENT, CHANGES IN DNA METHYLATION AND MRNA EXPRESSION, INCLUDING GENE LOCI WITH KNOWN ROLES IN CELL PROLIFERATION AND MIGRATION. THESE FINDINGS PROVIDE INSIGHTS INTO HOW CHRONIC STRESS-DRIVEN FUNCTIONAL EPIGENOMIC PATTERNS BECOME ESTABLISHED TO SHAPE KEY CELL PHENOTYPES. 2022 5 5164 32 PRECLINICAL AND CLINICAL EVIDENCE OF DNA METHYLATION CHANGES IN RESPONSE TO TRAUMA AND CHRONIC STRESS. EXPOSURE TO CHRONIC STRESS, EITHER REPEATED SEVERE ACUTE OR MODERATE SUSTAINED STRESS, IS ONE OF THE STRONGEST RISK FACTORS FOR THE DEVELOPMENT OF PSYCHOPATHOLOGIES SUCH AS POST-TRAUMATIC STRESS DISORDER AND DEPRESSION. CHRONIC STRESS IS LINKED WITH SEVERAL LASTING BIOLOGICAL CONSEQUENCES, PARTICULARLY TO THE STRESS ENDOCRINE SYSTEM BUT ALSO AFFECTING INTERMEDIATE PHENOTYPES SUCH AS BRAIN STRUCTURE AND FUNCTION, IMMUNE FUNCTION, AND BEHAVIOR. ALTHOUGH GENETIC PREDISPOSITION CONFERS A PROPORTION OF THE RISK, THE MOST RELEVANT MOLECULAR MECHANISMS DETERMINING THOSE SUSCEPTIBLE AND RESILIENT TO THE EFFECTS OF STRESS AND TRAUMA MAY BE EPIGENETIC. EPIGENETICS REFERS TO THE MECHANISMS THAT REGULATE GENOMIC INFORMATION BY DYNAMICALLY CHANGING THE PATTERNS OF TRANSCRIPTION AND TRANSLATION OF GENES. MOUNTING EVIDENCE FROM PRECLINICAL RODENT AND CLINICAL POPULATION STUDIES STRONGLY SUPPORT THAT EPIGENETIC MODIFICATIONS CAN OCCUR IN RESPONSE TO TRAUMATIC AND CHRONIC STRESS. HERE, WE DISCUSS THIS LITERATURE EXAMINING STRESS-INDUCED EPIGENETIC CHANGES IN PRECLINICAL MODELS AND CLINICAL COHORTS OF STRESS AND TRAUMA OCCURRING EARLY IN LIFE OR IN ADULTHOOD. WE HIGHLIGHT THAT A COMPLEX RELATIONSHIP BETWEEN THE TIMING OF ENVIRONMENTAL STRESSORS AND GENETIC PREDISPOSITIONS LIKELY MEDIATE THE RESPONSE TO CHRONIC STRESS OVER TIME, AND THAT A BETTER UNDERSTANDING OF EPIGENETIC CHANGES IS NEEDED BY FURTHER INVESTIGATIONS IN LONGITUDINAL AND POSTMORTEM BRAIN CLINICAL COHORTS. 2017 6 110 29 A ROLE FOR ACTIVITY-DEPENDENT EPIGENETICS IN THE DEVELOPMENT AND TREATMENT OF MAJOR DEPRESSIVE DISORDER. CHRONIC STRESSORS, DURING DEVELOPMENTAL SENSITIVE PERIODS AND BEYOND, CONTRIBUTE TO THE RISK OF DEVELOPING PSYCHIATRIC CONDITIONS, INCLUDING MAJOR DEPRESSIVE DISORDER (MDD). EPIGENETIC MECHANISMS INCLUDING DNA METHYLATION AND HISTONE MODIFICATIONS, AT KEY STRESS RESPONSE AND NEUROTROPHIN GENES, ARE INCREASINGLY IMPLICATED IN MEDIATING THIS RISK. ALTHOUGH THE EXACT MECHANISMS THROUGH WHICH STRESSFUL ENVIRONMENTAL STIMULI ALTER THE EPIGENOME ARE STILL UNCLEAR, RESEARCH FROM THE LEARNING AND MEMORY FIELDS INDICATES THAT EPIGENOMIC MARKS CAN BE ALTERED, AT LEAST IN PART, THROUGH CALCIUM-DEPENDENT SIGNALING CASCADES IN DIRECT RESPONSE TO NEURONAL ACTIVITY. IN THIS REVIEW, WE HIGHLIGHT KEY FINDINGS FROM THE STRESS, MDD, AND LEARNING AND MEMORY FIELDS TO PROPOSE A MODEL WHERE STRESS REGULATES DOWNSTREAM CELLULAR FUNCTIONING THROUGH ACTIVITY-DEPENDENT EPIGENETIC CHANGES. FURTHERMORE, WE SUGGEST THAT BOTH TYPICAL AND NOVEL ANTIDEPRESSANT TREATMENTS MAY EXERT POSITIVE INFLUENCE THROUGH SIMILAR, ACTIVITY-DEPENDENT PATHWAYS. 2018 7 2598 25 EPIGENETICS OF THE DEPRESSED BRAIN: ROLE OF HISTONE ACETYLATION AND METHYLATION. MAJOR DEPRESSIVE DISORDER IS A CHRONIC, REMITTING SYNDROME INVOLVING WIDELY DISTRIBUTED CIRCUITS IN THE BRAIN. STABLE ALTERATIONS IN GENE EXPRESSION THAT CONTRIBUTE TO STRUCTURAL AND FUNCTIONAL CHANGES IN MULTIPLE BRAIN REGIONS ARE IMPLICATED IN THE HETEROGENEITY AND PATHOGENESIS OF THE ILLNESS. EPIGENETIC EVENTS THAT ALTER CHROMATIN STRUCTURE TO REGULATE PROGRAMS OF GENE EXPRESSION HAVE BEEN ASSOCIATED WITH DEPRESSION-RELATED BEHAVIOR, ANTIDEPRESSANT ACTION, AND RESISTANCE TO DEPRESSION OR 'RESILIENCE' IN ANIMAL MODELS, WITH INCREASING EVIDENCE FOR SIMILAR MECHANISMS OCCURRING IN POSTMORTEM BRAINS OF DEPRESSED HUMANS. IN THIS REVIEW, WE DISCUSS RECENT ADVANCES IN OUR UNDERSTANDING OF EPIGENETIC CONTRIBUTIONS TO DEPRESSION, IN PARTICULAR THE ROLE OF HISTONE ACETYLATION AND METHYLATION, WHICH ARE REVEALING NOVEL MECHANISTIC INSIGHT INTO THE SYNDROME THAT MAY AID IN THE DEVELOPMENT OF NOVEL TARGETS FOR DEPRESSION TREATMENT. 2013 8 2252 29 EPIGENETIC MODULATION OF VISCERAL NOCICEPTION. EPIGENETICS IS A PROCESS THAT ALTERS GENE ACTIVITY OR PHENOTYPE WITHOUT ANY CHANGES IN THE UNDERLYING DNA SEQUENCE OR GENOTYPE. THESE BIOLOGICAL CHANGES MAY HAVE DELETERIOUS EFFECTS AND CAN LEAD TO VARIOUS HUMAN DISEASES. ONGOING RESEARCH IS CONTINUING TO ILLUMINATE THE ROLE OF EPIGENETICS IN A VARIETY OF PATHOPHYSIOLOGIC PROCESSES. SEVERAL CATEGORIES OF EPIGENETIC MECHANISMS HAVE BEEN STUDIED INCLUDING CHROMATIN REMODELING, DNA METHYLATION, HISTONE MODIFICATION, AND NON-CODING RNA MECHANISMS. THESE EPIGENETIC CHANGES CAN HAVE A LONG-TERM EFFECT ON GENE EXPRESSION WITHOUT ANY UNDERLYING CHANGES IN THE DNA SEQUENCES. THE UNDERLYING PATHOPHYSIOLOGY OF DISORDERS OF BRAIN-GUT INTERACTION AND STRESS-INDUCED VISCERAL PAIN ARE NOT FULLY UNDERSTOOD AND THE ROLE OF EPIGENETIC MECHANISMS IN THESE DISORDERS ARE STARTING TO BE BETTER UNDERSTOOD. CURRENT WORK IS UNDERWAY TO DETERMINE HOW EPIGENETICS PLAYS A ROLE IN THE NEUROBIOLOGY OF PATIENTS WITH CHRONIC VISCERAL PAIN AND HEIGHTENED VISCERAL NOCICEPTION. MORE RECENTLY, BOTH ANIMAL MODELS AND HUMAN STUDIES HAVE SHOWN HOW EPIGENETIC REGULATION MODULATES STRESS-INDUCED VISCERAL PAIN. WHILE MUCH MORE WORK IS NEEDED TO FULLY DELINEATE THE MECHANISTIC ROLE OF EPIGENETICS IN THE NEUROBIOLOGY OF CHRONIC VISCERAL NOCICEPTION, THE CURRENT STUDY BY LOUWIES ET AL., IN NEUROGASTROENTEROLOGY AND MOTILITY PROVIDES ADDITIONAL EVIDENCE SUPPORTING THE INVOLVEMENT OF EPIGENETIC ALTERATIONS IN THE CENTRAL NUCLEUS OF THE AMYGDALA IN STRESS-INDUCED VISCERAL HYPERSENSITIVITY IN RODENTS. 2022 9 678 37 BRAIN DEVELOPMENT UNDER STRESS: HYPOTHESES OF GLUCOCORTICOID ACTIONS REVISITED. ONE OF THE CONUNDRUMS IN TODAY'S STRESS RESEARCH IS WHY SOME INDIVIDUALS FLOURISH AND OTHERS PERISH UNDER SIMILAR STRESSFUL CONDITIONS. IT IS RECOGNIZED THAT THIS INDIVIDUAL VARIABILITY IN ADAPTATION TO STRESS DEPENDS ON THE OUTCOME OF THE INTERACTION OF GENETIC AND COGNITIVE/EMOTIONAL INPUTS IN WHICH GLUCOCORTICOID HORMONES AND RECEPTORS PLAY A CRUCIAL ROLE. HENCE ONE APPROACH TOWARDS UNDERSTANDING INDIVIDUAL VARIATION IN STRESS COPING IS HOW GLUCOCORTICOID ACTIONS CAN CHANGE FROM PROTECTIVE TO HARMFUL. TO ADDRESS THIS QUESTION WE FOCUS ON FOUR HYPOTHESES THAT ARE CONNECTED AND NOT MUTUAL EXCLUSIVE. FIRST, THE CLASSICAL GLUCOCORTICOID CASCADE HYPOTHESIS, IN WHICH THE INABILITY TO COPE WITH CHRONIC STRESS CAUSES A VICIOUS CYCLE OF EXCESS GLUCOCORTICOID AND DOWNREGULATION OF GLUCOCORTICOID RECEPTORS (GR) IN THE HIPPOCAMPUS TRIGGERING A FEED-FORWARD CASCADE OF DEGENERATION AND DISEASE. SECOND, THE BALANCE HYPOTHESIS, WHICH TAKES ALSO THE LIMBIC MINERALOCORTICOID RECEPTORS (MR) INTO ACCOUNT AND PROPOSES THAT AN INTEGRAL LIMBIC MR:GR IMBALANCE IS CAUSAL TO ALTERED PROCESSING OF INFORMATION IN CIRCUITS UNDERLYING FEAR, REWARD, SOCIAL BEHAVIOUR AND RESILIENCE, DYSREGULATION OF THE HYPOTHALAMIC-PITUITARY-ADRENAL (HPA) AXIS AND IMPAIRMENT OF BEHAVIOURAL ADAPTATION. THE MR:GR BALANCE IS ALTERED BY GENE VARIANTS OF THESE RECEPTOR COMPLEXES AND EXPERIENCE-RELATED FACTORS, WHICH CAN INDUCE LASTING EPIGENETIC CHANGES IN THE EXPRESSION OF THESE RECEPTORS. A PARTICULAR POTENT EPIGENETIC STIMULUS IS THE MATERNAL ENVIRONMENT WHICH IS FUNDAMENTAL FOR THE MATERNAL MEDIATION HYPOTHESIS. THE OUTCOME OF PERINATAL GENE X ENVIRONMENT INTERACTION, AND THUS OF MR:GR-MEDIATED FUNCTIONS DEPENDS HOWEVER, ON THE DEGREE OF 'MATCHING' WITH ENVIRONMENTAL DEMANDS IN LATER LIFE. THE PREDICTIVE ADAPTATION HYPOTHESIS THEREFORE PRESENTS A CONCEPTUAL FRAMEWORK TO EXAMINE THE ROLE OF GLUCOCORTICOIDS IN UNDERSTANDING INDIVIDUAL PHENOTYPIC DIFFERENCES IN STRESS-RELATED BEHAVIOURS OVER THE LIFESPAN. 2010 10 2235 27 EPIGENETIC MODIFICATIONS, ALCOHOLIC BRAIN AND POTENTIAL DRUG TARGETS. ACUTE AND CHRONIC ALCOHOL EXPOSURE EVIDENTLY INFLUENCES EPIGENETIC CHANGES, BOTH TRANSIENTLY AND PERMANENTLY, AND THESE CHANGES IN TURN INFLUENCE A VARIETY OF CELLS AND ORGAN SYSTEMS THROUGHOUT THE BODY. MANY OF THE ALCOHOL-INDUCED EPIGENETIC MODIFICATIONS CAN CONTRIBUTE TO CELLULAR ADAPTATIONS THAT ULTIMATELY LEAD TO BEHAVIORAL TOLERANCE AND ALCOHOL DEPENDENCE. THE PERSISTENCE OF BEHAVIORAL CHANGES DEMONSTRATES THAT LONG-LASTING CHANGES IN GENE EXPRESSION, WITHIN PARTICULAR REGIONS OF THE BRAIN, MAY CONTRIBUTE IMPORTANTLY TO THE ADDICTION PHENOTYPE. THE RESEARCH ACTIVITIES OVER THE PAST YEARS HAVE DEMONSTRATED A CRUCIAL ROLE OF EPIGENETIC MECHANISMS IN CAUSING LONG LASTING AND TRANSIENT CHANGES IN THE EXPRESSION OF SEVERAL GENES IN DIVERSE TISSUES, INCLUDING BRAIN. THIS HAS STIMULATED RECENT RESEARCH WORK THAT IS AIMED AT CHARACTERIZING THE INFLUENCE OF EPIGENETIC REGULATORY EVENTS IN MEDIATING THE LONG LASTING AND TRANSIENT EFFECTS OF ALCOHOL ABUSE ON THE BRAIN IN HUMANS AND ANIMAL MODELS OF ALCOHOL ADDICTION. IN THIS STUDY, WE UPDATE OUR CURRENT UNDERSTANDING OF THE IMPACT OF ALCOHOL EXPOSURE ON EPIGENETIC MECHANISMS IN THE BRAIN AND REFURBISH THE KNOWLEDGE OF EPIGENETICS IN THE DIRECTION OF NEW DRUGS DEVELOPMENT. 2016 11 2963 20 GENETIC AND EPIGENETIC MECHANISMS LINKING PAIN AND PSYCHIATRIC DISORDERS. THE NEUROPHYSIOLOGICAL LINK BETWEEN NEUROPATHIC PAIN AND DEPRESSION REMAINS UNKNOWN DESPITE EVIDENT HIGH COMORBIDITY OF THESE TWO DISORDERS. HOWEVER, THERE IS CONVINCING EVIDENCE THAT GENOTYPE PLAYS A ROLE IN BOTH PAIN AND DEPRESSION. USING VARIOUS TYPES OF GENETIC ANALYSIS - POPULATION GENETICS, CYTOGENETICS AND MOLECULAR TECHNOLOGIES - SPECIFIC GENES HAVE BEEN IMPLICATED IN MEDIATING ALMOST ALL ASPECTS OF NOCICEPTION AND MOOD DISORDERS. THE CURRENT REVIEW ATTEMPTS TO IDENTIFY SPECIFIC GENES AND EPIGENETIC MECHANISMS COMMON TO BOTH DISORDERS. IT IS CONCLUDED THAT EXTERNAL AND INTERNAL FACTORS (INFLAMMATION, STRESS, GENDER, ETC.) THAT CONTRIBUTE TO THE PATHOLOGIES MAY DO SO THROUGH EPIGENETIC MECHANISMS THAT MAY AFFECT EXPRESSION OF THESE PARTICULAR GENES. THE POSSIBLE INVOLVEMENT OF EPIGENETIC REGULATION IN PAIN AND PSYCHIATRIC DISORDERS SUGGESTS THAT TREATMENTS TARGETING EPIGENETIC MECHANISMS THAT MEDIATE ADVERSE LIFE EVENTS SHOULD BE CONSIDERED. 2015 12 1364 35 DEVELOPMENTAL NEUROENDOCRINOLOGY OF EARLY-LIFE STRESS: IMPACT ON CHILD DEVELOPMENT AND BEHAVIOR. OUR INTERNAL BALANCE, OR HOMEOSTASIS, IS THREATENED OR PERCEIVED AS THREATENED BY STRESSFUL STIMULI, THE STRESSORS. THE STRESS SYSTEM IS A HIGHLY CONSERVED SYSTEM THAT ADJUSTS HOMEOSTASIS TO THE RESTING STATE. THROUGH THE CONCURRENT ACTIVATION OF THE HYPOTHALAMIC-PITUITARY-ADRENAL AXIS AND THE LOCUS COERULEUS/NOREPINEPHRINE-AUTONOMIC NERVOUS SYSTEMS, THE STRESS SYSTEM PROVIDES THE APPROPRIATE PHYSICAL AND BEHAVIORAL RESPONSES, COLLECTIVELY TERMED AS "STRESS RESPONSE", TO RESTORE HOMEOSTASIS. IF THE STRESS RESPONSE IS PROLONGED, EXCESSIVE OR EVEN INADEQUATE, SEVERAL ACUTE OR CHRONIC STRESS-RELATED PATHOLOGIC CONDITIONS MAY DEVELOP IN CHILDHOOD, ADOLESCENCE AND ADULT LIFE. ON THE OTHER HAND, EARLY-LIFE EXPOSURE TO STRESSORS HAS BEEN RECOGNIZED AS A MAJOR CONTRIBUTING FACTOR UNDERLYING THE PATHOGENESIS OF NON-COMMUNICABLE DISORDERS, INCLUDING NEURODEVELOPMENTAL DISORDERS. ACCUMULATING EVIDENCE SUGGESTS THAT EARLY-LIFE STRESS HAS BEEN ASSOCIATED WITH AN INCREASED RISK FOR ATTENTION DEFICIT HYPERACTIVITY DISORDER AND AUTISM SPECTRUM DISORDER IN THE OFFSPRING, ALTHOUGH FINDINGS ARE STILL CONTROVERSIAL. NEVERTHELESS, AT THE MOLECULAR LEVEL, EARLY-LIFE STRESSORS ALTER THE CHEMICAL STRUCTURE OF CYTOSINES LOCAT- ED IN THE REGULATORY REGIONS OF GENES, MOSTLY THROUGH THE ADDITION OF METHYL GROUPS. THESE EPIGENETIC MODIFICATIONS RESULT IN THE SUPPRESSION OF GENE EXPRESSION WITHOUT CHANGING THE DNA SEQUENCE. IN ADDITION TO DNA METHYLATION, SEVERAL LINES OF EVIDENCE SUPPORT THE ROLE OF NON-CODING RNAS IN THE EVOLVING FIELD OF EPIGENETICS. IN THIS REVIEW ARTICLE, WE PRESENT THE ANATOMICAL AND FUNCTIONAL COMPO- NENTS OF THE STRESS SYSTEM, DISCUSS THE PROPER, IN TERMS OF QUALITY AND QUANTITY, STRESS RESPONSE, AND PROVIDE AN UPDATE ON THE IMPACT OF EARLY-LIFE STRESS ON CHILD DEVELOPMENT AND BEHAVIOR. 2023 13 5756 25 SOCIOECONOMIC DEPRIVATION, ADVERSE CHILDHOOD EXPERIENCES AND MEDICAL DISORDERS IN ADULTHOOD: MECHANISMS AND ASSOCIATIONS. SEVERE SOCIOECONOMIC DEPRIVATION (SED) AND ADVERSE CHILDHOOD EXPERIENCES (ACE) ARE SIGNIFICANTLY ASSOCIATED WITH THE DEVELOPMENT IN ADULTHOOD OF (I) ENHANCED INFLAMMATORY STATUS AND/OR HYPOTHALAMIC-PITUITARY-ADRENAL (HPA) AXIS DYSFUNCTION AND (II) NEUROLOGICAL, NEUROPROGRESSIVE, INFLAMMATORY AND AUTOIMMUNE DISEASES. THE MECHANISMS BY WHICH THESE ASSOCIATIONS TAKE PLACE ARE DETAILED. THE TWO SETS OF CONSEQUENCES ARE THEMSELVES STRONGLY ASSOCIATED, WITH THE FIRST SET LIKELY CONTRIBUTING TO THE SECOND. MECHANISMS ENABLING BIDIRECTIONAL COMMUNICATION BETWEEN THE IMMUNE SYSTEM AND THE BRAIN ARE DESCRIBED, INCLUDING COMPLEX SIGNALLING PATHWAYS FACILITATED BY FACTORS AT THE LEVEL OF IMMUNE CELLS. ALSO DETAILED ARE MECHANISMS UNDERPINNING THE ASSOCIATION BETWEEN SED, ACE AND THE GENESIS OF PERIPHERAL INFLAMMATION, INCLUDING EPIGENETIC CHANGES TO IMMUNE SYSTEM-RELATED GENE EXPRESSION. THE DURATION AND MAGNITUDE OF INFLAMMATORY RESPONSES CAN BE INFLUENCED BY GENETIC FACTORS, INCLUDING SINGLE NUCLEOTIDE POLYMORPHISMS, AND BY EPIGENETIC FACTORS, WHEREBY PRO-INFLAMMATORY CYTOKINES, REACTIVE OXYGEN SPECIES, REACTIVE NITROGEN SPECIES AND NUCLEAR FACTOR-KAPPAB AFFECT GENE DNA METHYLATION AND HISTONE ACETYLATION AND ALSO INDUCE SEVERAL MICRORNAS INCLUDING MIR-155, MIR-181B-1 AND MIR-146A. ADULT HPA AXIS ACTIVITY IS REGULATED BY (I) GENETIC FACTORS, SUCH AS GLUCOCORTICOID RECEPTOR POLYMORPHISMS; (II) EPIGENETIC FACTORS AFFECTING GLUCOCORTICOID RECEPTOR FUNCTION OR EXPRESSION, INCLUDING THE METHYLATION STATUS OF ALTERNATIVE PROMOTER REGIONS OF NR3C1 AND THE METHYLATION OF FKBP5 AND HSD11BETA2; (III) CHRONIC INFLAMMATION AND CHRONIC NITROSATIVE AND OXIDATIVE STRESS. FINALLY, IT IS SHOWN HOW SEVERE PSYCHOLOGICAL STRESS ADVERSELY AFFECTS MITOCHONDRIAL STRUCTURE AND FUNCTIONING AND IS ASSOCIATED WITH CHANGES IN BRAIN MITOCHONDRIAL DNA COPY NUMBER AND TRANSCRIPTION; MITOCHONDRIA CAN ACT AS COURIERS OF CHILDHOOD STRESS INTO ADULTHOOD. 2019 14 6414 30 THE STRESSED SYNAPSE 2.0: PATHOPHYSIOLOGICAL MECHANISMS IN STRESS-RELATED NEUROPSYCHIATRIC DISORDERS. STRESS IS A PRIMARY RISK FACTOR FOR SEVERAL NEUROPSYCHIATRIC DISORDERS. EVIDENCE FROM PRECLINICAL MODELS AND CLINICAL STUDIES OF DEPRESSION HAVE REVEALED AN ARRAY OF STRUCTURAL AND FUNCTIONAL MALADAPTIVE CHANGES, WHEREBY ADVERSE ENVIRONMENTAL FACTORS SHAPE THE BRAIN. THESE CHANGES, OBSERVED FROM THE MOLECULAR AND TRANSCRIPTIONAL LEVELS THROUGH TO LARGE-SCALE BRAIN NETWORKS, TO THE BEHAVIOURS REVEAL A COMPLEX MATRIX OF INTERRELATED PATHOPHYSIOLOGICAL PROCESSES THAT DIFFER BETWEEN SEXES, PROVIDING INSIGHT INTO THE POTENTIAL UNDERPINNINGS OF THE SEX BIAS OF NEUROPSYCHIATRIC DISORDERS. ALTHOUGH MANY PRECLINICAL STUDIES USE CHRONIC STRESS PROTOCOLS, LONG-TERM CHANGES ARE ALSO INDUCED BY ACUTE EXPOSURE TO TRAUMATIC STRESS, OPENING A PATH TO IDENTIFY DETERMINANTS OF RESILIENT VERSUS SUSCEPTIBLE RESPONSES TO BOTH ACUTE AND CHRONIC STRESS. EPIGENETIC REGULATION OF GENE EXPRESSION HAS EMERGED AS A KEY PLAYER UNDERLYING THE PERSISTENT IMPACT OF STRESS ON THE BRAIN. INDEED, HISTONE MODIFICATION, DNA METHYLATION AND MICRORNAS ARE CLOSELY INVOLVED IN MANY ASPECTS OF THE STRESS RESPONSE AND REVEAL THE GLUTAMATE SYSTEM AS A KEY PLAYER. THE SUCCESS OF KETAMINE HAS STIMULATED A WHOLE LINE OF RESEARCH AND DEVELOPMENT ON DRUGS DIRECTLY OR INDIRECTLY TARGETING GLUTAMATE FUNCTION. HOWEVER, THE CHALLENGE OF TRANSLATING THE EMERGING UNDERSTANDING OF STRESS PATHOPHYSIOLOGY INTO EFFECTIVE CLINICAL TREATMENTS REMAINS A MAJOR CHALLENGE. 2022 15 6729 29 VULNERABILITY TO STROKE: IMPLICATIONS OF PERINATAL PROGRAMMING OF THE HYPOTHALAMIC-PITUITARY-ADRENAL AXIS. CHRONIC STRESS IS CAPABLE OF EXACERBATING EACH MAJOR, MODIFIABLE, ENDOGENOUS RISK FACTOR FOR CEREBROVASCULAR AND CARDIOVASCULAR DISEASE. INDEED, EXPOSURE TO STRESS CAN INCREASE BOTH THE INCIDENCE AND SEVERITY OF STROKE, PRESUMABLY THROUGH ACTIVATION OF THE HYPOTHALAMIC-PITUITARY-ADRENAL (HPA) AXIS. NOW THAT CHARACTERIZATION OF THE MECHANISMS UNDERLYING EPIGENETIC PROGRAMMING OF THE HPA AXIS IS WELL UNDERWAY, THERE HAS BEEN RENEWED INTEREST IN EXAMINING THE ROLE OF EARLY ENVIRONMENT ON THE EVOLUTION OF HEALTH CONDITIONS ACROSS THE ENTIRE LIFESPAN. INDEED, NEONATAL MANIPULATIONS IN RODENTS THAT REDUCE STRESS RESPONSIVITY, AND SUBSEQUENT LIFE-TIME EXPOSURE TO GLUCOCORTICOIDS, ARE ASSOCIATED WITH A REDUCTION IN THE DEVELOPMENT OF NEUROENDOCRINE, NEUROANATOMICAL, AND COGNITIVE DYSFUNCTIONS THAT TYPICALLY PROGRESS WITH AGE. ALTHOUGH IMPROVED DAY TO DAY REGULATION OF THE HPA AXIS ALSO MAY BE ACCOMPANIED BY A DECREASE IN STROKE RISK, EVIDENCE FROM RODENT STUDIES SUGGEST THAT AN ASSOCIATED COST COULD BE INCREASED SUSCEPTIBILITY TO INFLAMMATION AND NEURONAL DEATH IN THE EVENT THAT A STROKE DOES OCCUR AND THE INDIVIDUAL IS EXPOSED TO PERSISTENTLY ELEVATED CORTICOSTEROIDS. GIVEN ITS IMPORTANCE IN REGULATION OF HEALTH AND DISEASE STATES, ANY LONG-TERM MODULATION OF THE HPA AXIS IS LIKELY TO BE ASSOCIATED WITH BOTH BENEFITS AND POTENTIAL RISKS. THE GOALS OF THIS REVIEW ARTICLE ARE TO EXAMINE (1) THE CLINICAL AND EXPERIMENTAL DATA SUGGESTING THAT NEONATAL EXPERIENCES CAN SHAPE HPA AXIS REGULATION, (2) THE INFLUENCE OF STRESS AND THE HPA AXIS ON STROKE INCIDENCE AND SEVERITY, AND (3) THE POTENTIAL FOR NEONATAL PROGRAMMING OF THE HPA AXIS TO IMPACT ADULT CEREBROVASCULAR HEALTH. 2009 16 802 32 CENTRAL AND PERIPHERAL STRESS-INDUCED EPIGENETIC MECHANISMS OF RESILIENCE. PURPOSE OF REVIEW: RESILIENCE IS AN ADAPTATION PROCESS PRESENTED BY AN INDIVIDUAL DESPITE FACING ADVERSITIES. EPIGENETIC CHANGES, SUCH AS HISTONE ACETYLATION/METHYLATION AND DNA METHYLATION, HAVE BEEN DEMONSTRATED TO MEDIATE STRESS RESPONSE. IN THIS REVIEW, WE SUMMARIZE RECENT FINDINGS ON EPIGENETIC MECHANISMS CONTRIBUTING TO STRESS RESILIENCE. RECENT FINDINGS: EPIGENETIC MODIFICATIONS OF GENES INVOLVED IN SYNAPTIC PLASTICITY, ENDOCRINE, IMMUNE, AND VASCULAR SYSTEMS ARE LINKED TO RESILIENCE. FOR INSTANCE, INCREASED DNA METHYLATION OF THE NONNEURONAL GROWTH FACTOR GDNF IN SPECIFIC BRAIN REGIONS PROMOTES STRESS RESILIENCE. ADDITIONALLY, HIGH DNA METHYLATION AT THE GLUCOCORTICOID RECEPTOR GENE WAS ASSOCIATED WITH RESILIENCE IN BOTH RODENTS AND HUMANS. AT THE IMMUNE LEVEL, CHRONIC STRESS INDUCES INCREASED DNA METHYLATION AT IL6 GENE, A MEDIATOR OF STRESS VULNERABILITY. MOREOVER, EPIGENETIC ADAPTATIONS OF THE BLOOD--BRAIN BARRIER HAVE BEEN RECENTLY ASSOCIATED WITH STRESS RESILIENCE, WHICH COULD LEAD TO INNOVATIVE THERAPEUTIC APPROACHES TO TREAT DEPRESSION. SUMMARY: IDENTIFICATION OF BOTH CENTRAL AND PERIPHERAL EPIGENETIC CHANGES PROMOTING STRESS RESILIENCE REPRESENT PROMISING NOVEL TARGETS IN THE DEVELOPMENT OF PREVENTIVE AND PERSONALIZED MEDICINE. NEVERTHELESS, MORE RESEARCH IS NEEDED TO ESTABLISH SEX SPECIFIC DIFFERENCES AND TO IDENTIFY NOVEL EPIGENETIC MECHANISMS, SUCH AS SEROTONYLATION AND DOPAMINYLATION, THAT HOLD GREAT PROMISES FOR THE FIELD OF PSYCHIATRY. 2021 17 2269 40 EPIGENETIC PROGRAMMING OF THE NEUROENDOCRINE STRESS RESPONSE BY ADULT LIFE STRESS. THE HYPOTHALAMIC-PITUITARY-ADRENAL (HPA) AXIS IS CRITICALLY INVOLVED IN THE NEUROENDOCRINE REGULATION OF STRESS ADAPTATION, AND THE RESTORATION OF HOMEOSTASIS FOLLOWING STRESS EXPOSURE. DYSREGULATION OF THIS AXIS IS ASSOCIATED WITH STRESS-RELATED PATHOLOGIES LIKE MAJOR DEPRESSIVE DISORDER, POST-TRAUMATIC STRESS DISORDER, PANIC DISORDER AND CHRONIC ANXIETY. IT HAS LONG BEEN UNDERSTOOD THAT STRESS DURING EARLY LIFE CAN HAVE A SIGNIFICANT LASTING INFLUENCE ON THE DEVELOPMENT OF THE NEUROENDOCRINE SYSTEM AND ITS NEURAL REGULATORS, PARTIALLY BY MODIFYING EPIGENETIC REGULATION OF GENE EXPRESSION, WITH IMPLICATIONS FOR HEALTH AND WELL-BEING IN LATER LIFE. EVIDENCE IS ACCUMULATING THAT EPIGENETIC PLASTICITY ALSO EXTENDS TO ADULTHOOD, PROPOSING IT AS A MECHANISM BY WHICH PSYCHOLOGICAL TRAUMA LATER IN LIFE CAN LONG-LASTINGLY AFFECT HPA AXIS FUNCTION, BRAIN PLASTICITY, NEURONAL FUNCTION AND BEHAVIOURAL ADAPTATION TO NEUROPSYCHOLOGICAL STRESS. FURTHER CORROBORATING THIS CLAIM IS THE PHENOMENON THAT THESE EPIGENETIC CHANGES CORRELATE WITH THE BEHAVIOURAL CONSEQUENCES OF TRAUMA EXPOSURE. THEREBY, EPIGENETIC MODIFICATIONS PROVIDE A PUTATIVE MOLECULAR MECHANISM BY WHICH THE BEHAVIOURAL PHENOTYPE AND TRANSCRIPTIONAL/TRANSLATIONAL POTENTIAL OF GENES INVOLVED IN HPA AXIS REGULATION CAN CHANGE DRASTICALLY IN RESPONSE TO ENVIRONMENTAL CHALLENGES, AND APPEAR AN IMPORTANT TARGET FOR TREATMENT OF STRESS-RELATED DISORDERS. HOWEVER, IMPROVED INSIGHT IS REQUIRED TO INCREASE THEIR THERAPEUTIC (DRUG) POTENTIAL. HERE, WE PROVIDE AN OVERVIEW OF THE GROWING BODY OF LITERATURE DESCRIBING THE EPIGENETIC MODULATION OF THE (PRIMARILY NEUROENDOCRINE) STRESS RESPONSE AS A CONSEQUENCE OF ADULT LIFE STRESS AND INTERPRET THE IMPLICATIONS FOR, AND THE CHALLENGES INVOLVED IN APPLYING THIS KNOWLEDGE TO, THE IDENTIFICATION AND TREATMENT OF STRESS-RELATED PSYCHIATRIC DISORDERS. 2017 18 2011 37 EPIGENETIC BASIS OF MENTAL ILLNESS. PSYCHIATRIC DISORDERS ARE COMPLEX MULTIFACTORIAL ILLNESSES INVOLVING CHRONIC ALTERATIONS IN NEURAL CIRCUIT STRUCTURE AND FUNCTION AS WELL AS LIKELY ABNORMALITIES IN GLIAL CELLS. WHILE GENETIC FACTORS ARE IMPORTANT IN THE ETIOLOGY OF MOST MENTAL DISORDERS, THE RELATIVELY HIGH RATES OF DISCORDANCE AMONG IDENTICAL TWINS, PARTICULARLY FOR DEPRESSION AND OTHER STRESS-RELATED SYNDROMES, CLEARLY INDICATE THE IMPORTANCE OF ADDITIONAL MECHANISMS. ENVIRONMENTAL FACTORS SUCH AS STRESS ARE KNOWN TO PLAY A ROLE IN THE ONSET OF THESE ILLNESSES. EXPOSURE TO SUCH ENVIRONMENTAL INSULTS INDUCES STABLE CHANGES IN GENE EXPRESSION, NEURAL CIRCUIT FUNCTION, AND ULTIMATELY BEHAVIOR, AND THESE MALADAPTATIONS APPEAR DISTINCT BETWEEN DEVELOPMENTAL VERSUS ADULT EXPOSURES. INCREASING EVIDENCE INDICATES THAT THESE SUSTAINED ABNORMALITIES ARE MAINTAINED BY EPIGENETIC MODIFICATIONS IN SPECIFIC BRAIN REGIONS. INDEED, TRANSCRIPTIONAL DYSREGULATION AND THE ABERRANT EPIGENETIC REGULATION THAT UNDERLIES THIS DYSREGULATION IS A UNIFYING THEME IN PSYCHIATRIC DISORDERS. HERE, WE PROVIDE A PROGRESS REPORT OF EPIGENETIC STUDIES OF THE THREE MAJOR PSYCHIATRIC SYNDROMES, DEPRESSION, SCHIZOPHRENIA, AND BIPOLAR DISORDER. WE REVIEW THE LITERATURE DERIVED FROM ANIMAL MODELS OF THESE DISORDERS AS WELL AS FROM STUDIES OF POSTMORTEM BRAIN TISSUE FROM HUMAN PATIENTS. WHILE EPIGENETIC STUDIES OF MENTAL ILLNESS REMAIN AT EARLY STAGES, UNDERSTANDING HOW ENVIRONMENTAL FACTORS RECRUIT THE EPIGENETIC MACHINERY WITHIN SPECIFIC BRAIN REGIONS TO CAUSE LASTING CHANGES IN DISEASE SUSCEPTIBILITY AND PATHOPHYSIOLOGY IS REVEALING NEW INSIGHT INTO THE ETIOLOGY AND TREATMENT OF THESE CONDITIONS. 2016 19 3618 40 IN VITRO MODELING OF THE NEUROBIOLOGICAL EFFECTS OF GLUCOCORTICOIDS: A REVIEW. HYPOTHALAMIC-PITUITARY ADRENAL (HPA)AXIS DYSREGULATION HAS LONG BEEN IMPLICATED IN STRESS-RELATED DISORDERS SUCH AS MAJOR DEPRESSION AND POST-TRAUMATIC STRESS DISORDER. GLUCOCORTICOIDS (GCS) ARE RELEASED FROM THE ADRENAL GLANDS AS A RESULT OF HPA-AXIS ACTIVATION. THE RELEASE OF GCS IS IMPLICATED WITH SEVERAL NEUROBIOLOGICAL CHANGES THAT ARE ASSOCIATED WITH NEGATIVE CONSEQUENCES OF CHRONIC STRESS AND THE ONSET AND COURSE OF PSYCHIATRIC DISORDERS. INVESTIGATING THE UNDERLYING NEUROBIOLOGICAL EFFECTS OF GCS MAY HELP TO BETTER UNDERSTAND THE PATHOPHYSIOLOGY OF STRESS-RELATED PSYCHIATRIC DISORDERS. GCS IMPACT A PLETHORA OF NEURONAL PROCESSES AT THE GENETIC, EPIGENETIC, CELLULAR, AND MOLECULAR LEVELS. GIVEN THE SCARCITY AND DIFFICULTY IN ACCESSING HUMAN BRAIN SAMPLES, 2D AND 3D IN VITRO NEURONAL CULTURES ARE BECOMING INCREASINGLY USEFUL IN STUDYING GC EFFECTS. IN THIS REVIEW, WE PROVIDE AN OVERVIEW OF IN VITRO STUDIES INVESTIGATING THE EFFECTS OF GCS ON KEY NEURONAL PROCESSES SUCH AS PROLIFERATION AND SURVIVAL OF PROGENITOR CELLS, NEUROGENESIS, SYNAPTIC PLASTICITY, NEURONAL ACTIVITY, INFLAMMATION, GENETIC VULNERABILITY, AND EPIGENETIC ALTERATIONS. FINALLY, WE DISCUSS THE CHALLENGES IN THE FIELD AND OFFER SUGGESTIONS FOR IMPROVING THE USE OF IN VITRO MODELS TO INVESTIGATE GC EFFECTS. 2023 20 2913 27 GENE REGULATORY MECHANISMS UNDERLYING SEX DIFFERENCES IN BRAIN DEVELOPMENT AND PSYCHIATRIC DISEASE. THE SEXUAL DIFFERENTIATION OF THE MAMMALIAN NERVOUS SYSTEM REQUIRES THE PRECISE COORDINATION OF THE TEMPORAL AND SPATIAL REGULATION OF GENE EXPRESSION IN DIVERSE CELL TYPES. SEX HORMONES ACT AT MULTIPLE DEVELOPMENTAL TIME POINTS TO SPECIFY SEX-TYPICAL DIFFERENTIATION DURING EMBRYONIC AND EARLY DEVELOPMENT AND TO COORDINATE SUBSEQUENT RESPONSES TO GONADAL HORMONES LATER IN LIFE BY ESTABLISHING SEX-TYPICAL PATTERNS OF EPIGENETIC MODIFICATIONS ACROSS THE GENOME. THUS, MUTATIONS ASSOCIATED WITH NEUROPSYCHIATRIC CONDITIONS MAY RESULT IN SEXUALLY DIMORPHIC SYMPTOMS BY ACTING ON DIFFERENT NEURAL SUBSTRATES OR CHROMATIN LANDSCAPES IN MALES AND FEMALES. FINALLY, AS STRESS HORMONE SIGNALING MAY DIRECTLY ALTER THE MOLECULAR MACHINERY THAT INTERACTS WITH SEX HORMONE RECEPTORS TO REGULATE GENE EXPRESSION, THE CONTRIBUTION OF CHRONIC STRESS TO THE PATHOGENESIS OR PRESENTATION OF MENTAL ILLNESS MAY BE ADDITIONALLY DIFFERENT BETWEEN THE SEXES. HERE, WE REVIEW THE MECHANISMS THAT CONTRIBUTE TO SEXUAL DIFFERENTIATION IN THE MAMMALIAN NERVOUS SYSTEM AND CONSIDER SOME OF THE IMPLICATIONS OF THESE PROCESSES FOR SEX DIFFERENCES IN NEUROPSYCHIATRIC CONDITIONS. 2018