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psychiatric epigenetics

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https://www.readbyqxmd.com/read/27933312/the-genetics-and-epigenetics-of-ptsd-overview-recent-advances-and-future-directions
#1
Christina M Sheerin, Mackenzie J Lind, Kaitlin Bountress, Nicole R Nugent, Ananda B Amstadter
This paper provides a brief summary and commentary on the growing literature and current developments related to the genetic underpinnings of posttraumatic stress disorder (PTSD). We first briefly provide an overview of the behavioral genetic literature on PTSD, followed by a short synopsis of the substantial candidate gene literature with a focus on genes that have been meta-analyzed. We then discuss the genome-wide association studies (GWAS) that have been conducted, followed by an introduction to other molecular platforms used in PTSD genomic studies, such as epigenetic and expression approaches...
April 2017: Current Opinion in Psychology
https://www.readbyqxmd.com/read/27911745/the-role-of-epigenetic-mechanisms-in-the-regulation-of-gene-expression-in-the-nervous-system
#2
Justyna Cholewa-Waclaw, Adrian Bird, Melanie von Schimmelmann, Anne Schaefer, Huimei Yu, Hongjun Song, Ram Madabhushi, Li-Huei Tsai
Neuroepigenetics is a newly emerging field in neurobiology that addresses the epigenetic mechanism of gene expression regulation in various postmitotic neurons, both over time and in response to environmental stimuli. In addition to its fundamental contribution to our understanding of basic neuronal physiology, alterations in these neuroepigenetic mechanisms have been recently linked to numerous neurodevelopmental, psychiatric, and neurodegenerative disorders. This article provides a selective review of the role of DNA and histone modifications in neuronal signal-induced gene expression regulation, plasticity, and survival and how targeting these mechanisms could advance the development of future therapies...
November 9, 2016: Journal of Neuroscience: the Official Journal of the Society for Neuroscience
https://www.readbyqxmd.com/read/27883060/environmental-intervention-as-a-therapy-for-adverse-programming-by-ancestral-stress
#3
J Keiko McCreary, Zachary T Erickson, YongXin Hao, Yaroslav Ilnytskyy, Igor Kovalchuk, Gerlinde A S Metz
Ancestral stress can program stress sensitivity and health trajectories across multiple generations. While ancestral stress is uncontrollable to the filial generations, it is critical to identify therapies that overcome transgenerational programming. Here we report that prenatal stress in rats generates a transgenerationally heritable endocrine and epigenetic footprint and elevated stress sensitivity which can be alleviated by beneficial experiences in later life. Ancestral stress led to downregulated glucocorticoid receptor and prefrontal cortex neuronal densities along with precocious development of anxiety-like behaviours...
November 24, 2016: Scientific Reports
https://www.readbyqxmd.com/read/27880876/an-integrative-review-of-methylation-at-the-serotonin-transporter-gene-and-its-dialogue-with-environmental-risk-factors-psychopathology-and-5-httlpr
#4
REVIEW
H Palma-Gudiel, L Fañanás
Gene-environment (G×E) interactions have largely been regarded as the root of many complex disorders, including several psychiatric disorders. In this regard, it has been hypothesized that epigenetic mechanisms may be the main mediators of such interactions. Of particular interest is the previously described interaction between psychosocial stress and genetic variability of the serotonin transporter gene (SLC6A4) in its polymorphic region 5-HTTLPR. Here we review the literature concerning SLC6A4 methylation in association with environmental, clinical or genetic variables...
November 20, 2016: Neuroscience and Biobehavioral Reviews
https://www.readbyqxmd.com/read/27874848/the-human-bdnf-gene-peripheral-gene-expression-and-protein-levels-as-biomarkers-for-psychiatric-disorders
#5
REVIEW
A Cattaneo, N Cattane, V Begni, C M Pariante, M A Riva
Brain-derived neurotrophic factor (BDNF) regulates the survival and growth of neurons, and influences synaptic efficiency and plasticity. The human BDNF gene consists of 11 exons, and distinct BDNF transcripts are produced through the use of alternative promoters and splicing events. The majority of the BDNF transcripts can be detected not only in the brain but also in the blood cells, although no study has yet investigated the differential expression of BDNF transcripts at the peripheral level. This review provides a description of the human BDNF gene structure as well as a summary of clinical and preclinical evidence supporting the role of BDNF in the pathogenesis of psychiatric disorders...
November 22, 2016: Translational Psychiatry
https://www.readbyqxmd.com/read/27870405/sex-differences-in-brain-derived-neurotrophic-factor-signaling-functions-and-implications
#6
REVIEW
Yi-Chao Wei, Shao-Ran Wang, Xiao-Hong Xu
Brain-derived neurotrophic factor (BDNF) regulates diverse processes such as neuronal survival, differentiation, and plasticity. Accumulating evidence suggests that molecular events that direct sexual differentiation of the brain interact with BDNF signaling pathways. This Mini-Review first examines potential hormonal and epigenetic mechanisms through which sex influences BDNF signaling. We then examine how sex-specific regulation of BDNF signaling supports the development and function of sexually dimorphic neural circuits that underlie male-specific genital reflexes in rats and song production in birds...
January 2, 2017: Journal of Neuroscience Research
https://www.readbyqxmd.com/read/27856950/the-role-of-epigenetics-in-social-psychiatry
#7
REVIEW
Jacob Peedicayil
BACKGROUND: Epigenetics refers to the study of heritable changes in gene expression not involving changes in DNA sequence and is presently an active area of research in biology and medicine. There is increasing evidence that epigenetics is involved in the pathogenesis of psychiatric disorders. AIMS AND METHODS: Several studies conducted to date have suggested that psychosocial factors act by modifying epigenetic mechanisms of gene expression in the brain in the pathogenesis of psychiatric disorders...
November 16, 2016: International Journal of Social Psychiatry
https://www.readbyqxmd.com/read/27845777/newer-insights-into-the-role-of-mirna-a-tiny-genetic-tool-in-psychiatric-disorders-focus-on-post-traumatic-stress-disorder
#8
REVIEW
V V Giridharan, R A Thandavarayan, G R Fries, C Walss-Bass, T Barichello, N J Justice, M K Reddy, J Quevedo
Post-traumatic stress disorder (PTSD) is a mental disorder occurring in about 2-9% of individuals after their exposure to life-threatening events, such as severe accidents, sexual abuse, combat or a natural catastrophe. Because PTSD patients are exposed to trauma, it is likely that epigenetic modifications have an important role in disease development and prognosis. For the past two decades, abnormal expression of the epigenetic regulators microRNAs (miRs) and miR-mediated gene regulation have been given importance in a variety of human diseases, such as cancer, heart disease and viral infection...
November 15, 2016: Translational Psychiatry
https://www.readbyqxmd.com/read/27818357/the-role-of-neuropathological-markers-in-the-interpretation-of-neuropsychiatric-disorders-focus-on-fetal-and-perinatal-programming
#9
REVIEW
Fanni Daniela, Gerosa Clara, Rais Monica, Ravarino Alberto, Van Eyken Peter, Fanos Vassilios, Faa Gavino
The study of neuropathological markers in patients affected by mental/psychiatric disorders is relevant for the comprehension of the pathogenesis and the correlation with the clinical symptomatology. The neuropathology of Alzheimer's disease (AD) recognizes intraneuronal and extracellular neurofibrillary formation responsible for neuronal degeneration. Immunohistochemical studies discovered many interesting results for a better interpretation of the AD pathogenesis, while the "metal hypothesis" supports that metal ions might differentially influence the formation of amyloid aggregates...
November 3, 2016: Neuroscience Letters
https://www.readbyqxmd.com/read/27788914/it-s-all-in-the-brain-a-review-of-available-functional-genomic-annotations
#10
REVIEW
Sarah A Gagliano
What makes the molecular study of psychiatric and other neurological conditions particularly challenging compared with other complex traits is the difficulty of accessing the relevant tissue. The Encyclopedia of DNA Elements (ENCODE) project was one of the earliest producers of brain-derived epigenetic functional genomic data, albeit initially from only two cancerous brain cell lines for a limited number of epigenetic marks. It has only been in very recent years that such data from human brain tissue have been made available from various sources...
August 11, 2016: Biological Psychiatry
https://www.readbyqxmd.com/read/27770494/paternal-age-and-psychiatric-disorders-a-review
#11
Hilde de Kluiver, Jacobine E Buizer-Voskamp, Conor V Dolan, Dorret I Boomsma
We review the hypotheses concerning the association between the paternal age at childbearing and childhood psychiatric disorders (autism spectrum- and attention deficit/hyperactive disorder) and adult disorders (schizophrenia, bipolar-, obsessive-compulsive-, and major depressive disorder) based on epidemiological studies. Several hypotheses have been proposed to explain the paternal age effect. We discuss the four main-not mutually exclusive-hypotheses. These are the de novo mutation hypothesis, the hypothesis concerning epigenetic alterations, the selection into late fatherhood hypothesis, and the environmental resource hypothesis...
October 22, 2016: American Journal of Medical Genetics. Part B, Neuropsychiatric Genetics
https://www.readbyqxmd.com/read/27748930/mirnas-and-their-role-in-the-correlation-between-schizophrenia-and-cancer-review
#12
E Rizos, N Siafakas, E Skourti, C Papageorgiou, J Tsoporis, T H Parker, D I Christodoulou, D A Spandidos, E Katsantoni, V Zoumpourlis
Schizophrenia (SZ) and cancer (Ca) have a broad spectrum of clinical phenotypes and a complex biological background, implicating a large number of genetic and epigenetic factors. SZ is a chronic neurodevelopmental disorder signified by an increase in the expression of apoptotic molecular signals, whereas Ca is conversely characterized by an increase in appropriate molecular signaling that stimulates uncontrolled cell proliferation. The rather low risk of developing Ca in patients suffering from SZ is a hypothesis that is still under debate...
October 14, 2016: Molecular Medicine Reports
https://www.readbyqxmd.com/read/27746755/epigenetics-in-schizophrenia-a-pilot-study-of-global-dna-methylation-in-different-brain-regions-associated-with-higher-cognitive-functions
#13
Raúl Alelú-Paz, Francisco J Carmona, José V Sanchez-Mut, Ariel Cariaga-Martínez, Ana González-Corpas, Nadia Ashour, Maria J Orea, Ana Escanilla, Alfonso Monje, Carmen Guerrero Márquez, Jerónimo Saiz-Ruiz, Manel Esteller, Santiago Ropero
Attempts to discover genes that are involved in the pathogenesis of major psychiatric disorders have been frustrating and often fruitless. Concern is building about the need to understand the complex ways in which nature and nurture interact to produce mental illness. We analyze the epigenome in several brain regions from schizophrenic patients with severe cognitive impairment using high-resolution (450K) DNA methylation array. We identified 139 differentially methylated CpG sites included in known and novel candidate genes sequences as well as in and intergenic sequences which functions remain unknown...
2016: Frontiers in Psychology
https://www.readbyqxmd.com/read/27743609/sva-retrotransposons-as-potential-modulators-of-neuropeptide-gene-expression
#14
Olympia Gianfrancesco, Vivien J Bubb, John P Quinn
Many facets of human behaviour are likely to have developed in part due to evolutionary changes in the regulation of neuropeptide and other brain-related genes. This has allowed species-specific expression patterns and unique epigenetic modulation in response to our environment, regulating response not only at the molecular level, but also contributing to differences in behaviour between individuals. As such, genetic variants or epigenetic changes that may alter neuropeptide gene expression are predicted to play a role in behavioural conditions and psychiatric illness...
October 11, 2016: Neuropeptides
https://www.readbyqxmd.com/read/27742259/oxidative-stress-and-alterations-in-dna-methylation-two-sides-of-the-same-coin-in-reproduction
#15
REVIEW
Yves J R Menezo, Erica Silvestris, Brian Dale, Kay Elder
The negative effect of oxidative stress on the human reproductive process is no longer a matter for debate. Oxidative stress affects female and male gametes and the developmental capacity of embryos. Its effect can continue through late stages of pregnancy. Metabolic disorders and psychiatric problems can also be caued by DNA methylation and epigenetic errors. Age has a negative effect on oxidative stress and DNA methylation, and recent observations suggest that older men are at risk of transmitting epigenetic disorders to their offspring...
September 27, 2016: Reproductive Biomedicine Online
https://www.readbyqxmd.com/read/27739386/allostatic-load-and-comorbidities-a-mitochondrial-epigenetic-and-evolutionary-perspective
#16
Robert-Paul Juster, Jennifer J Russell, Daniel Almeida, Martin Picard
Stress-related pathophysiology drives comorbid trajectories that elude precise prediction. Allostatic load algorithms that quantify biological "wear and tear" represent a comprehensive approach to detect multisystemic disease processes of the mind and body. However, the multiple morbidities directly or indirectly related to stress physiology remain enigmatic. Our aim in this article is to propose that biological comorbidities represent discrete pathophysiological processes captured by measuring allostatic load...
November 2016: Development and Psychopathology
https://www.readbyqxmd.com/read/27727234/genome-wide-chromatin-and-gene-expression-profiling-during-memory-formation-and-maintenance-in-adult-mice
#17
Tonatiuh Pena Centeno, Orr Shomroni, Magali Hennion, Rashi Halder, Ramon Vidal, Raza-Ur Rahman, Stefan Bonn
Recent evidence suggests that the formation and maintenance of memory requires epigenetic changes. In an effort to understand the spatio-temporal extent of learning and memory-related epigenetic changes we have charted genome-wide histone and DNA methylation profiles, in two different brain regions, two cell types, and three time-points, before and after learning. In this data descriptor we provide detailed information on data generation, give insights into the rationale of experiments, highlight necessary steps to assess data quality, offer guidelines for future use of the data and supply ready-to-use code to replicate the analysis results...
October 11, 2016: Scientific Data
https://www.readbyqxmd.com/read/27719836/do-epi-genetics-impact-the-brain-in-functional-neurologic-disorders
#18
T Frodl
Advances in neuropsychiatric research are supposed to lead to significant improvements in understanding functional neurologic disorders and their diagnosis. However, epigenetic and genetic research on conversion disorders and somatoform disorders is only at its start. This review demonstrates the current state within this field and tries to bridge a gap from what is known on gene-stress interactions in other psychiatric disorders like depression. The etiology of conversion disorders is hypothesized to be multifactorial...
2017: Handbook of Clinical Neurology
https://www.readbyqxmd.com/read/27711046/histone-lysine-demethylases-of-jmjd2-or-kdm4-family-are-important-epigenetic-regulators-in-reward-circuitry-in-the-etiopathology-of-depression
#19
Salil Saurav Pathak, Swati Maitra, Sumana Chakravarty, Arvind Kumar
Major depressive disorder (MDD) is debilitating mental illness and is one of the leading contributors to global burden of disease, but unfortunately newer and better drugs are not forthcoming. The reason is lack of complete understanding of molecular mechanisms underlying the development of this disorder. Recent research shows dysregulation in epigenetic regulatory mechanisms, particularly the transcriptionally repressive di- and tri-methylation of histone 3 lysine 9 (H3K9me2/me3) in nucleus accumbens (NAc), a critical region of the reward pathway involved in the development of anhedonia, the hallmark of depression...
October 6, 2016: Neuropsychopharmacology: Official Publication of the American College of Neuropsychopharmacology
https://www.readbyqxmd.com/read/27692350/-epigenetics-implication-in-autism-spectrum-disorders-a-review
#20
M Hamza, S Halayem, R Mrad, S Bourgou, F Charfi, A Belhadj
BACKGROUND: The etiology of autism spectrum disorders (ASD) is complex and multifactorial, and the roles of genetic and environmental factors in its emergence have been well documented. Current research tends to indicate that these two factors act in a synergistic manner. The processes underlying this interaction are still poorly known, but epigenetic modifications could be the mediator in the gene/environment interface. The epigenetic mechanisms have been implicated in susceptibility to stress and also in the pathogenesis of psychiatric disorders including depression and schizophrenia...
September 27, 2016: L'Encéphale
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