Download or read book Studies on the Role of Gene environment Interaction in the Pathogenesis of Schizophrenia Using a Genetic Animal Model written by Sara Jamali and published by . This book was released on 2012 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: "AbstractGenetic factors and early adverse environmental events interact to contribute to thepathogenesis of schizophrenia. Here, we investigated if immune-activation duringdevelopment interacts with a susceptibility gene to produce schizophrenia-relatedphenotypes. We injected mice with a loss of function mutation in dysbindin-1, aschizophrenia-risk gene and controls with either Polyinosinic:polycytidylic acid (PolyI:C), a viral mimic or saline, at postnatal days (PD)5,6 and 7. At PD60, possible geneenvironment(GxE) interaction was studied using tests of behaviours relevant toschizophrenia as well as examination of postnatal neurogenesis. Our data showed asignificant effect of genotype on spontaneous locomotion as dysbindin-1 homozygousmice displayed increased locomotor activity. Further, we observed a significant effect ofgenotype as a decrease in the number of newborn cells in the glomerular layer of theolfactory bulb (OB). Analyses of the data did not reveal an interactive effect betweendysbindin-1 and Poly I:C exposure as far as spontaneous locomotion, pre-pulse inhibitionof the acoustic startle, novel object recognition memory, elevated plus maze, fearmemory, the number of newborn cells in the dentate gyrus and granular cell layer of theolfactory bulb are concerned. These preliminary results demonstrate lack of an interactiveeffect between this schizophrenia candidate gene and this viral mimic at neonatal periodson selected behavioural and neurobiological measures. Further investigation usingdifferent doses of the immune activator and/or different timing of treatment are needed tofully test GxE hypothesis." --
Download or read book Schizophrenia A Consequence of Gene Environment Interactions written by Tim Karl and published by Frontiers Media SA. This book was released on 2015-06-06 with total page 128 pages. Available in PDF, EPUB and Kindle. Book excerpt: Schizophrenia is a multi-factorial disease characterized by a high heritability and environmental risk factors (e.g. stress and cannabis use). In recent years, an increasing number of researchers worldwide have started investigating the ‘two-hit hypothesis’ of schizophrenia predicting that genetic and environmental risk factors interactively cause the development of the disorder. This work is starting to produce valuable new animal models and reveal novel insights into the pathophysiology of schizophrenia. Eventually, it might help advance studies of the molecular pathways involved in this mental disorder and propose more specific molecular medicine. However, the complexity of this multi-factorial line of research has also caused difficulties in data interpretation and comparison. Our research topic is intended to cover past and current directions in research dedicated to the understanding and measurement of gene-environment interactions (GxE) in schizophrenia, the neurobiological and behavioural consequences of such interactions as well as the challenges and limitations one encounters when working on complex aetiological systems.
Download or read book Gene Environment Interactions in Psychiatry written by Bart Ellenbroek and published by Academic Press. This book was released on 2016-07-26 with total page 368 pages. Available in PDF, EPUB and Kindle. Book excerpt: Gene-Environment Interactions in Psychiatry: Nature, Nurture, Neuroscience begins with the basic aspects of gene–environment studies, such as basic genetics, principles of animals modeling, and the basic processes of how environmental factors affect brain and behavior, with part two describing the most important psychiatric disorders in detail. Each chapter has a similar structure that includes a general description of the disorder that is followed by an analysis of the role of genes and how they are affected by environmental factors. Each chapter ends with a description of the most relevant animal models, again focusing on gene–environment interactions. The book concludes with a critical evaluation of the current research and an outlook for the (possible) future, offering a vignette into the fascinating world of nature, nurture, and neuroscience. Written to provide in-depth basic knowledge on gene–environment interactions for graduate students, postgraduate students, clinicians, and scientists Includes descriptions of the major psychiatric disorders Provides detailed descriptions of animal models and basic genetic information Presents well-illustrated color figures to explain complex features in a simple manner
Download or read book Genetic Models of Schizophrenia written by Akira Sawa and published by Elsevier. This book was released on 2009-11-10 with total page 142 pages. Available in PDF, EPUB and Kindle. Book excerpt: This is a well-established international series that examines major areas of basic and clinical research within neuroscience (as well as emerging and promising subfields): neuroanatomy, neurophysiology, neuroimaging, neurobiology, neuropharmacology, neuroendocrinology, neuropathology, neuropsychiatry, and neurobehavior. This volume provides a thorough treatment of gene models of schizophrenia, presenting articles from leading contributors in this important area.
Download or read book Behavioral Neurobiology of Schizophrenia and Its Treatment written by Neal R. Swerdlow and published by Springer Science & Business Media. This book was released on 2010-08-19 with total page 667 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book describes the state-of-the-art of treatment of schizophrenia and reflects its development in 22 chapters written by leading authorities in the field
Download or read book Animal Models for the Study of Human Disease written by David Feifel and published by Elsevier Inc. Chapters. This book was released on 2013-05-29 with total page 77 pages. Available in PDF, EPUB and Kindle. Book excerpt: Modeling schizophrenia in animals represents a formidable challenge because the most characteristic symptoms of this disorder, auditory hallucinations and delusional beliefs, cannot be directly modeled in animals. Furthermore, limited current understanding of the etiology and pathophysiology underlying the clinical features of this disorder greatly hinders the ability to develop valid models based on those aspects. To circumvent these issues, investigators have attempted to recreate the leading candidate biochemical, neuroanatomical, and genetic abnormalities for this disorder in animals using pharmacological, developmental, neurotoxic, genetic engineering, and other methods. The validity of these animal preparations as animal models for schizophrenia is generally based upon the extent to which they induce measurable behavioral changes that are homologous or analogous to the core clinical features or the information-processing endophenotypes (presymptom phenotypes) that are seen in schizophrenia. The utility of any animal model to serve as a screen for novel treatments is considered related to the extent to which the schizophrenia-relevant behaviors it exhibits can be ameliorated by drugs with known efficacy in schizophrenia but not by drugs known to be therapeutic for brain disorders other than schizophrenia.
Download or read book Principles of Psychiatric Genetics written by John I. Nurnberger and published by Cambridge University Press. This book was released on 2012-09-13 with total page 415 pages. Available in PDF, EPUB and Kindle. Book excerpt: A comprehensive, up-to-date resource providing information about genetic influences on disorders of behavior.
Download or read book The Recognition and Management of Early Psychosis written by Patrick D. McGorry and published by Cambridge University Press. This book was released on 1999-07-28 with total page 527 pages. Available in PDF, EPUB and Kindle. Book excerpt: The treatment of early psychosis has been bedevilled by an entrenched pessimism, stemming from the asylum era and the Kraepelinian model of schizophrenia. More recently, however, there has been a surge of interest in preventively oriented treatment of patients showing the first signs of psychotic illness, with the realization that these illnesses are frequently highly responsive to early treatment. This is the first text to focus on the potential of early detection of psychosis, and the practicalities of treatment. Based on the pioneering experience and research of a now well-established prevention and intervention centre, and with contributions from international authorities, the book outlines a framework for intervention, reviews the evidence available to guide clinical practice, and describes models of treatment. Incorporating many personal narratives and case histories, it is strong on theory, sensitive on practical issues, and will challenge, inform and guide clinicians.
Download or read book Schizophrenia written by Steven M. Silverstein and published by MIT Press. This book was released on 2013-11-15 with total page 403 pages. Available in PDF, EPUB and Kindle. Book excerpt: Leading researchers address conceptual and technical issues in schizophrenia and suggest novel strategies for advancing research and treatment. Despite major advances in methodology and thousands of published studies every year, treatment outcomes in schizophrenia have not improved over the last fifty years. Moreover, we still lack strategies for prevention and we do not yet understand how the interaction of genetic, developmental, and environmental factors contribute to the disorder. In this book, leading researchers consider conceptual and technical obstacles to progress in understanding schizophrenia and suggest novel strategies for advancing research and treatment. The contributors address a wide range of critical issues: the construct of schizophrenia itself; etiology, risk, prediction, and prevention; different methods of modeling the disorder; and treatment development and delivery. They identify crucial gaps in our knowledge and offer creative but feasible suggestions. These strategies include viewing schizophrenia as a heterogeneous group of conditions; adopting specific new approaches to prediction and early intervention; developing better integration of data across genetics, imaging, perception, cognition, phenomenology, and other fields; and moving toward an evidence-based, personalized approach to treatment requiring rational clinical decision-making to reduce functional disability. Contributors Robert Bittner, Robert W. Buchanan, Kristin S. Cadenhead, William T. Carpenter, Jr., Aiden Corvin, Daniel Durstewitz, André A. Fenton, Camilo de la Fuente-Sandoval, Jay A. Gingrich, Joshua A. Gordon, Chloe Gott, Peter B. Jones, René S. Kahn, Richard Keefe, Wolfgang Kelsch, James L. Kennedy, Matcheri S. Keshavan, Angus W. MacDonald III, Anil K. Malhotra, John McGrath, Andreas Meyer-Lindenberg, Kevin J. Mitchell, Bita Moghaddam, Vera A. Morgan, Craig Morgan, Kim T. Mueser, Karoly Nikolich, Patricio O'Donnell, Michael O'Donovan, William A. Phillips, Wulf Rössler, Louis Sass, Akira Sawa, Jeremy K. Seamans, Steven M. Silverstein, William Spaulding, Sharmili Sritharan, Heike Tost, Peter Uhlhaas, Aristotle Voineskos, Michèle Wessa, Leanne M. Williams, Ashley Wilson, Til Wykes
Download or read book First Episode Psychosis written by Katherine J. Aitchison and published by CRC Press. This book was released on 1999-02-17 with total page 152 pages. Available in PDF, EPUB and Kindle. Book excerpt: The new edition of this popular handbook has been thoroughly updated to include the latest data concerning treatment of first-episode patients. Drawing from their experience, the authors discuss the presentation and assessment of the first psychotic episode and review the appropriate use of antipsychotic agents and psychosocial approaches in effective management.
Download or read book Schizophrenia and Psychotic Spectrum Disorders written by S. Charles Schulz and published by Oxford University Press. This book was released on 2016-04-01 with total page 401 pages. Available in PDF, EPUB and Kindle. Book excerpt: Schizophrenia and Psychotic Spectrum Disorders aims to engage young caregivers in psychiatry, psychology, nursing and social work so that they will be able to become well informed about this significant--and at times confusing--illness. Because schizophrenia is considered to be one of the most complicated and severe psychiatric disorders, this book has the goal of summarizing key issues of the illness, such as its presentation, frequency and age of onset, and diagnostic characteristics. It also contains informative chapters about the pathophysiology of schizophrenia, ranging from brain development issues, genetics, and likely abnormalities in neurotransmitters. This book will give young professionals and those joining the field an excellent and accessible background to treatment. In this area, Schizophrenia and Psychotic Spectrum Disorders provides a comprehensive approach to diagnosis, treatment initiation, strategies for non-response, approaches of therapy, and importantly, ways to provide family therapy and support.
Download or read book Disc1 Mutant Mice Subjected to Chronic Social Defeat Stress as a Model of Gene Environment Interaction in Schizophrenia and Depression written by F. Nipa Haque and published by . This book was released on 2009 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book The Epidemiology of Schizophrenia written by Robin M. Murray and published by Cambridge University Press. This book was released on 2009-10-01 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: An international team of leading researchers and clinicians provides the first comprehensive, epidemiological overview of this multi-faceted and still-perplexing disorder. Controversial issues such as the validity of discrete or dimensional classifications of schizophrenia and the continuum between psychosis and 'normality' are explored in depth. Separate chapters are devoted to topics of particular relevance to schizophrenia such as suicide, violence and substance abuse. Finally, new prospects for treatment and prevention are considered.
Download or read book Modeling the Psychopathological Dimensions of Schizophrenia written by Mikhail Pletnikov and published by Academic Press. This book was released on 2015-11-05 with total page 550 pages. Available in PDF, EPUB and Kindle. Book excerpt: Modeling the Psychopathological Dimensions of Schizophrenia: From Molecules to Behavior is the first book to offer a comprehensive review of the new theoretical, clinical, and basic research framework that considers psychotic illness as a group of dimensional representations of psychopathology rather than as traditional distinct categorical diagnoses. Psychotic illness, typified by schizophrenia, is a devastating condition increasingly recognized as a disorder of abnormal brain development and dysconnectivity. Its complex etiology involves both genetic and environmental factors, as well as the interplay among them. This book describes the current understanding of the clinical and pathological features of schizophrenia, with a particular focus on the evolving conceptualization of schizophrenia and related diagnostic categories of psychotic illness as combinations of dimensional abnormalities. It provides an overview of modern strategies for generating cellular and whole animal models of schizophrenia as well as detailed reviews of the specific experimental preparations and paradigms aimed at molecular, developmental, and brain-network mechanisms that are the underlying aspects of abnormal behavior and various aspects of schizophrenia. This groundbreaking book is an authoritative overview of the translational impact of emerging clinical insights on basic research approaches in schizophrenia that will advance the reader’s understanding of the five major dimensions of psychopathology in schizophrenia and related psychoses and resolve the genetic and neurobiological underpinnings of these dimensions. Includes reviews of animal models that capture the most recent insights into the etiology and pathogenetic mechanisms of schizophrenia, with an emphasis on the translational potential of these models Contains a series of reviews of recently available cellular models for analysis of signaling pathways and gene expression, which complement behavioral neuroscience research in schizophrenia Edited and authored by leading researchers in the field of schizophrenia and related psychoses
Download or read book Disc1 Mutant Mice Subjected to Chronic Social Defeat Stress as a Model of Gene environment Interaction in Schizophrenia and Depression written by Fahmida Nipa Haque and published by . This book was released on 2009 with total page 338 pages. Available in PDF, EPUB and Kindle. Book excerpt: Human genetic data suggests DISC1 (Disrupted-in-schizophrenia 1) is a susceptibility gene for schizophrenia and depression. Disc1 Q31L-/- mutants show depression-like behaviour and Disc1 L100P-/- mutants schizophrenia-like behaviour. Heterozygous mutants show an intermediate phenotype. In a gene-environment interaction study, we exposed heterozygotes to chronic social defeat (CSD) stress and phenotyped behaviour. Disc1, Bdnf(III) and Pde4b mRNA levels were also measured. Moreover, as epigenetic mechanisms may mediate some effects of CSD, we also exposed wildtype mice to CSD concurrently with the histone deacetylase inhibitor valproate. We found that CSD increased anxiety in L100P-/+ mutants, and that levels of Disc1, Bdnf(III) and Pde4b mRNA were higher in this mutant. Valproate treatment did not correct CSD-induced behavioural changes. In conclusion, we have demonstrated an interaction between a strong susceptibility gene for psychiatric disease and an environmental manipulation similar to stressors known to affect mental illness.
Download or read book Neuroprogression in Psychiatry written by Flávio Kapczinski and published by Oxford University Press. This book was released on 2019-03-05 with total page 272 pages. Available in PDF, EPUB and Kindle. Book excerpt: Recent studies regarding the neuropathology of specific neurological disorders suggest that both neurodevelopmental and neurodegenerative processes may play a role. However, in contrast to the neurodegeneration seen in neurological disorders such as Parkinson's and Alzheimer's disease, the term "neuroprogression" has been used to describe the neurodevelopmental aspect of pathological brain re-wiring that takes place in the context of severe psychiatric disorders, such as schizophrenia or bipolar disorder. Within psychiatry, patients with severe psychopathology, such as those depressed patients who eventually commit suicide, have been shown to present with increased inflammatory markers in the brain. A similar increase in inflammatory markers is also found in patients with bipolar disorders and schizophrenia. Thus, oxidative stress, inflammation, and changes in growth factors are thought to be the pathways of neuroprogression. Neuroprogression in Psychiatry provides a comprehensive summary of the current developments in the emerging field of neuroprogression. With contributions by leading researchers in the field, this book examines the role of neuroprogression across a wide range of specific psychiatric disorders, with chapters included on major depressive disorder, anxiety disorder, post-traumatic stress disorder, substance abuse, schizophrenia, and bipolar disorder.
Download or read book Candidate Genes for Psychosis and Their Interaction with Environmental Factors written by Marta de Castro i Català and published by . This book was released on 2017 with total page 194 pages. Available in PDF, EPUB and Kindle. Book excerpt: "Schizophrenia is a severe and complex mental disorder that results in an inability to cope with life's ordinary demands and routines. Normally, it appears in late adolescence, more frequently and developing earlier in males. It seems that disruption of the factors and pathways involved in brain development may cause modifications in neural structure, function or connectivity, leading to a final brain more susceptible to develop psychotic symptoms. The high diversity of symptoms intra- and inter-patient, makes the exploration of the aetiology and biological pathways underlying this illness, as well as its treatment, substantially difficult and suggests that alternative strategies may be more helpful for the study of such disease. Despite the psychotic phenotype has traditionally been thought as a dichotomous entity (i.e. "healthy" and "ill" subjects), evidence shows that psychosis exists as a distribution of symptoms expressed across a continuum ranging from nonclinical, subclinical to clinical manifestations with shared underlying etiological and developmental processes. Schizotypy and psychotic-like experiences are intermediate phenotypes of psychosis that measure the liability for psychosis-proneness. They can be found in healthy people and, although they are non-destabilising in the daily life, represent an increased risk for psychosis and are believed to share risk factors with the illness. The predisposition to develop psychopathology is determined by a complex combination and/or interplay between genetic, environmental, personal and epigenetic factors. The genes responsible for schizophrenia susceptibility have been tried to identify using classic candidate-gene research strategies and, more recently genome-wide association studies (GWAS), but despite interesting genes have been reported, the variance in liability explained by these genes is low. It seems thus, that these approaches are be missing epistatic and gene-environment interactions (GxE), which could explain part of the phenotype. Additionally, the study of intermediate phenotypes related with the disorder, instead of the illness itself, seems to be a good strategy that allows a better definition of the phenotype under study. Environmental factors also play a significant role in the aetiology of the disorder. Exposure to childhood trauma is a robust risk factor for psychosis that has been associated to increased schizotypy and psychotic-like experiences. It seems to affect mental health though alterations in the stress-related systems (i.e. HPA axis), however, not all subjects who experience these adverse events will develop psychosis, pointing out that other factors are modulating this response. Gene-environment interaction may be an important variable explaining the observed differential risk to develop psychosis. In this sense, genetic vulnerability predisposes an individual to the development of psychopathology and, when a level of stressors exceeds this vulnerability threshold, symptoms emerge. In this sense, polymorphic variants in genes involved in stress-response related genes (e.g. FKPB5), as well as those involved in neurodevelopment or neurotransmitter systems (e.g. COMT, BDNF, RGS4, ZNF804A), are interesting candidate genes. According to this, the present thesis aimed to explore the involvement of several schizophrenia candidate gens (i.e. COMT, RGS4 and ZNF804A) on the development of psychosis-related phenotypes in nonclinical samples, as well as the modulating role of some of these genes (i.e. BDNF, FKBP5, COMT) in the association between childhood trauma and psychosis-proneness phenotypes. In line with previous published research, the results of the present thesis showed interesting associations between COMT, RGS4 and ZNF804A genes and the psychosis-proneness phenotype (i.e. schizotypy and/or psychotic-like experiences) in nonclinical subjects, which seem to be sex-specific in some cases. Moreover, BDNF and FKBP5 show a modulating role on the association between childhood trauma and psychopathology in nonclinical subjects. In the case of FKBP5 we found that it modulates this association in relation to depressive-anxious symptoms. This thesis, shows the interest of exploring schizophrenia candidate genes in relation to psychosis-related phenotypes in nonclinical samples to study the underlying mechanisms involved in the development of psychopathology. The findings support the existence of a continuum psychotic phenotype with a multifactorial aetiology involving genes, environment and possibly other factors that are active agents in the formation of an individuals' level of vulnerability. Moreover, they encourage future studies in samples across the psychosis continuum considering the multifactorial nature of the disorder and related traits by implementing the new developed methodologies and considering adequate sample sizes, appropriate statistical models, accurate phenotypic and environmental measures and also sexual differences." -- TDX.
