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https://www.readbyqxmd.com/read/28100850/molecular-characteristic-and-physiological-role-of-dopa-decarboxylase
#1
Joanna Guenter, Robert Lenartowski
The enzyme DOPA decarboxylase (aromatic-L-amino-acid decarboxylase, DDC) plays an important role in the dopaminergic system and participates in the uptake and decarboxylation of amine precursors in the peripheral tissues. Apart from catecholamines, DDC catalyses the biosynthesis of serotonin and trace amines. It has been shown that the DDC amino acid sequence is highly evolutionarily conserved across many species. The activity of holoenzyme is regulated by stimulation/blockade of membrane receptors, phosphorylation of serine residues, and DDC interaction with regulatory proteins...
December 31, 2016: Postȩpy Higieny i Medycyny Doświadczalnej
https://www.readbyqxmd.com/read/28094813/a-methylome-wide-mqtl-analysis-reveals-associations-of-methylation-sites-with-gad1-and-hdac3-snps-and-a-general-psychiatric-risk-score
#2
D M Ciuculete, A E Boström, S Voisin, H Philipps, O E Titova, M Bandstein, L Nikontovic, M J Williams, J Mwinyi, H B Schiöth
Genome-wide association studies have identified a number of single-nucleotide polymorphisms (SNPs) that are associated with psychiatric diseases. Increasing body of evidence suggests a complex connection of SNPs and the transcriptional and epigenetic regulation of gene expression, which is poorly understood. In the current study, we investigated the interplay between genetic risk variants, shifts in methylation and mRNA levels in whole blood from 223 adolescents distinguished by a risk for developing psychiatric disorders...
January 17, 2017: Translational Psychiatry
https://www.readbyqxmd.com/read/28059592/mutual-regulation-of-micrornas-and-dna-methylation-in-human-cancers
#3
Sumei Wang, Wanyin Wu, Francois X Claret
microRNAs (miRNAs) and DNA methylation are the two epigenetic modifications that have emerged in recent years as the most critical players in the regulation of gene expression. Compelling evidence has indicated the roles of miRNAs and DNA methylation in modulating cellular transformation and tumorigenesis. miRNAs act as negative regulators of gene expression and are involved in the regulation of both physiological conditions and during diseases, such as cancer, inflammatory diseases, and psychiatric disorders, among others...
January 6, 2017: Epigenetics: Official Journal of the DNA Methylation Society
https://www.readbyqxmd.com/read/28045465/methylomic-profiling-of-cortex-samples-from-completed-suicide-cases-implicates-a-role-for-psors1c3-in-major-depression-and-suicide
#4
T M Murphy, B Crawford, E L Dempster, E Hannon, J Burrage, G Turecki, Z Kaminsky, J Mill
Major depressive disorder (MDD) represents a major social and economic health issue and constitutes a major risk factor for suicide. The molecular pathology of suicidal depression remains poorly understood, although it has been hypothesised that regulatory genomic processes are involved in the pathology of both MDD and suicidality. In this study, genome-wide patterns of DNA methylation were assessed in depressed suicide completers (n=20) and compared with non-psychiatric, sudden-death controls (n=20) using tissue from two cortical brain regions (Brodmann Area 11 (BA11) and Brodmann Area 25 (BA25))...
January 3, 2017: Translational Psychiatry
https://www.readbyqxmd.com/read/28027955/oxytocin-pathways-in-the-intergenerational-transmission-of-maternal-early-life-stress
#5
REVIEW
Philipp Toepfer, Christine Heim, Sonja Entringer, Elisabeth Binder, Pathik Wadhwa, Claudia Buss
Severe stress in early life, such as childhood abuse and neglect, constitutes a major risk factor in the etiology of psychiatric disorders and somatic diseases. Importantly, these long-term effects may impact the next generation. The intergenerational transmission of maternal early life stress (ELS) may occur via pre-and postnatal pathways, such as alterations in maternal-fetal-placental stress physiology, maternal depression during pregnancy and postpartum, as well as impaired mother-offspring interactions...
December 24, 2016: Neuroscience and Biobehavioral Reviews
https://www.readbyqxmd.com/read/27990322/recent-advances-and-controversies-in-peripartum-depression
#6
Jennifer L Payne
PURPOSE OF REVIEW: The purpose of this review is to update readers on recent controversies and findings on the underlying biology and clinical management of peripartum depression. RECENT FINDINGS: Topics discussed include the discovery and replication of two epigenetic biomarkers of peripartum depression, two well controlled studies that do NOT find associations between in utero antidepressant exposure and cardiac defects and persistent pulmonary hypertension of the newborn and ongoing controversy on whether antidepressant use during pregnancy prevents peripartum depression and whether or not hormonal treatments have a place in the management of postpartum depression...
September 2016: Current Obstetrics and Gynecology Reports
https://www.readbyqxmd.com/read/27981188/maternal-immune-activation-epigenetically-regulates-hippocampal-serotonin-transporter-levels
#7
Sonali N Reisinger, Eryan Kong, Deeba Khan, Stefan Schulz, Marianne Ronovsky, Stefanie Berger, Orsolya Horvath, Maureen Cabatic, Angelika Berger, Daniela D Pollak
Major depressive disorder (MDD) is one of the most debilitating psychiatric diseases, affecting a large percentage of the population worldwide. Currently, the underlying pathomechanisms remain incompletely understood, hampering the development of critically needed alternative therapeutic strategies, which further largely depends on the availability of suitable model systems. Here we used a mouse model of early life stress - a precipitating factor for the development of MDD - featuring infectious stress through maternal immune activation (MIA) by polyinosinic:polycytidilic acid (Poly(I:C)) to examine epigenetic modulations as potential molecular correlates of the alterations in brain structure, function and behavior...
October 2016: Neurobiology of Stress
https://www.readbyqxmd.com/read/27965039/genetic-predisposition-to-high-anxiety-and-depression-like-behavior-coincides-with-diminished-dna-methylation-in-the-adult-rat-amygdala
#8
Chelsea R McCoy, Nateka L Jackson, Jeremy Day, Sarah M Clinton
Understanding biological mechanisms that shape vulnerability to emotional dysfunction is critical for elucidating the neurobiology of psychiatric illnesses like anxiety and depression. To elucidate molecular and epigenetic alterations in the brain that contribute to individual differences in emotionality, our laboratory utilized a rodent model of temperamental differences. Rats bred for low response to novelty (Low Responders, LRs) are inhibited in novel situations and display high anxiety, helplessness, and diminished sociability compared to High Novelty Responder (HR) rats...
March 1, 2017: Behavioural Brain Research
https://www.readbyqxmd.com/read/27938391/false-data-positive-results-in-neurobiology-moving-beyond-the-epigenetics-of-blood-and-saliva-samples-in-mental-disorders
#9
EDITORIAL
A Cariaga-Martinez, R Alelú-Paz
Many psychiatric diseases are influenced by a set of several genetic and environmental factors that genetics alone cannot explain. Specifically, in schizophrenia and bipolar disorder the absence of consistently replicated genetic effects together with evidence for lasting changes in gene expression after environmental exposures suggest a role of epigenetic mechanisms in its pathophysiological mechanisms. In this field, the presence of positive results could potentially uncover molecular mechanisms of deregulated gene expression in these complex disorders...
December 12, 2016: Journal of Negative Results in Biomedicine
https://www.readbyqxmd.com/read/27933312/the-genetics-and-epigenetics-of-ptsd-overview-recent-advances-and-future-directions
#10
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
#11
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
#12
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
#13
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...
January 2017: 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
#14
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
#15
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
#16
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
#17
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
#18
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
#19
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
#20
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
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