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Developmental plasticity

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https://www.readbyqxmd.com/read/28209779/a-histone-h4-lysine-20-methyltransferase-couples-environmental-cues-to-sensory-neuron-control-of-developmental-plasticity
#1
Colin E Delaney, Albert T Chen, Jacqueline V Graniel, Kathleen J Dumas, Patrick J Hu
Animals change developmental fates in response to external cues. In the nematode Caenorhabditis elegans, unfavorable environmental conditions induce a state of diapause known as dauer by inhibiting the conserved DAF-2 insulin-like signaling (ILS) pathway through incompletely understood mechanisms. We previously established a role for the C. elegans dosage compensation protein DPY-21 in the control of dauer arrest and DAF-2 ILS. Here we show that the histone H4 lysine 20 methyltransferase SET-4, which also influences dosage compensation, promotes dauer arrest in part by repressing the X-linked ins-9 gene, which encodes a new agonist insulin-like peptide (ILP) expressed specifically in the paired ASI sensory neurons that are required for dauer bypass...
February 16, 2017: Development
https://www.readbyqxmd.com/read/28205138/kant-s-epigenesis-specificity-and-developmental-constraints
#2
Boris Demarest
In this paper, I argue that Kant adopted, throughout his career, a position that is much more akin to classical accounts of epigenesis, although he does reject the more radical forms of epigenesis proposed in his own time, and does make use of preformationist sounding terms. I argue that this is because Kant (1) thinks of what is pre-formed as a species, not an individual or a part of an individual; (2) has no qualm with the idea of a specific, teleological principle or force underlying generation, and conceives of germs and predispositions as specific constraints on such a principle or force...
March 2017: History and Philosophy of the Life Sciences
https://www.readbyqxmd.com/read/28202817/adaptive-shaping-of-the-behavioural-and-neuroendocrine-phenotype-during-adolescence
#3
Tobias D Zimmermann, Sylvia Kaiser, Michael B Hennessy, Norbert Sachser
Environmental conditions during early life can adaptively shape the phenotype for the prevailing environment. Recently, it has been suggested that adolescence represents an additional temporal window for adaptive developmental plasticity, though supporting evidence is scarce. Previous work has shown that male guinea pigs living in large mixed-sex colonies develop a low-aggressive phenotype as part of a queuing strategy that is adaptive for integrating into large unfamiliar colonies. By contrast, males living in pairs during adolescence become highly aggressive towards strangers...
February 22, 2017: Proceedings. Biological Sciences
https://www.readbyqxmd.com/read/28199414/direct-and-transgenerational-effects-of-low-doses-of-perinatal-di-2-ethylhexyl-phthalate-dehp-on-social-behaviors-in-mice
#4
Kayla M Quinnies, Erin P Harris, Rodney W Snyder, Susan S Sumner, Emilie F Rissman
Di-(2-ethylhexyl) phthalate (DEHP) is an endocrine disrupting chemical commonly used as a plasticizer in medical equipment, food packaging, flooring, and children's toys. DEHP exposure during early development has been associated with adverse neurobehavioral outcomes in children. In animal models, early exposure to DEHP results in abnormal development of the reproductive system as well as altered behavior and neurodevelopment. Based on these data, we hypothesized that developmental exposure to DEHP would decrease social interactions and increase anxiety-like behaviors in mice in a dose-dependent manner, and that the effects would persist over generations...
2017: PloS One
https://www.readbyqxmd.com/read/28197949/the-impact-of-next-generation-sequencing-on-the-diagnosis-and-treatment-of-epilepsy-in-paediatric-patients
#5
REVIEW
Davide Mei, Elena Parrini, Carla Marini, Renzo Guerrini
Next-generation sequencing (NGS) has contributed to the identification of many monogenic epilepsy syndromes and is favouring earlier and more accurate diagnosis in a subset of paediatric patients with epilepsy. The cumulative information emerging from NGS studies is rapidly changing our comprehension of the relations between early-onset severe epilepsy and the associated neurological impairment, progressively delineating specific entities previously gathered under the umbrella definition of epileptic encephalopathies, thereby influencing treatment choices and limiting the most aggressive drug regimens only to those conditions that are likely to actually benefit from them...
February 14, 2017: Molecular Diagnosis & Therapy
https://www.readbyqxmd.com/read/28197719/regulatory-crosstalk-between-micrornas-and-hormone-signalling-cascades-controls-the-variation-on-seed-dormancy-phenotype-at-arabidopsis-thaliana-seed-set
#6
Yang Liu, Yousry A El-Kassaby
We employed an Illumina sequencing approach to identify candidate microRNA cohorts that may greatly contribute to seed dormancy modulation and to construct a microRNA-gene regulatory network in hormone signalling cascades. MicroRNAs (miRNAs) are important signalling molecules and regulate many developmental programs of plants. Some miRNAs have been integrated into gene regulatory networks (GRNs) and coordinate developmental plasticity, but few study systematically investigated how phenotypical variations are regulated through differential expression of miRNA tags in GRNs during seed set...
February 14, 2017: Plant Cell Reports
https://www.readbyqxmd.com/read/28197549/activation-dependent-rapid-postsynaptic-clustering-of-glycine-receptors-in-mature-spinal-cord-neurons
#7
Yoshihisa Nakahata, Kei Eto, Hideji Murakoshi, Miho Watanabe, Toshihiko Kuriu, Hiromi Hirata, Andrew J Moorhouse, Hitoshi Ishibashi, Junichi Nabekura
Inhibitory synapses are established during development but continue to be generated and modulated in strength in the mature nervous system. In the spinal cord and brainstem, presynaptically released inhibitory neurotransmitter dominantly switches from GABA to glycine during normal development in vivo. While presynaptic mechanisms of the shift of inhibitory neurotransmission are well investigated, the contribution of postsynaptic neurotransmitter receptors to this shift is not fully elucidated. Synaptic clustering of glycine receptors (GlyRs) is regulated by activation-dependent depolarization in early development...
January 2017: ENeuro
https://www.readbyqxmd.com/read/28196860/the-nclx-type-na-ca-2-exchanger-ncx-9-is-required-for-patterning-of-neural-circuits-in-caenorhabditis-elegans
#8
Vishal Sharma, Soumitra Roy, Israel Sekler, Damien M O'Halloran
NCLX is a Na(+)/Ca(2+) exchanger that uses energy stored in the transmembrane sodium gradient to facilitate the exchange of sodium ions for ionic calcium. Mammals have a single NCLX, which has been shown to function primarily at the mitochondrion and is an important regulator of neuronal physiology by contributing to neurotransmission and synaptic plasticity. The role of NCLX in developmental cell patterning, for example, in neural circuits, is largely unknown. Here we describe a novel role for the Caenorhabditis elegans NCLX-type protein, NCX-9, in neural circuit formation...
February 14, 2017: Journal of Biological Chemistry
https://www.readbyqxmd.com/read/28193997/stepwise-reprogramming-of-liver-cells-to-a-pancreas-progenitor-state-by-the-transcriptional-regulator-tgif2
#9
Nuria Cerdá-Esteban, Heike Naumann, Silvia Ruzittu, Nancy Mah, Igor M Pongrac, Corinna Cozzitorto, Angela Hommel, Miguel A Andrade-Navarro, Ezio Bonifacio, Francesca M Spagnoli
The development of a successful lineage reprogramming strategy of liver to pancreas holds promises for the treatment and potential cure of diabetes. The liver is an ideal tissue source for generating pancreatic cells, because of its close developmental origin with the pancreas and its regenerative ability. Yet, the molecular bases of hepatic and pancreatic cellular plasticity are still poorly understood. Here, we report that the TALE homeoprotein TGIF2 acts as a developmental regulator of the pancreas versus liver fate decision and is sufficient to elicit liver-to-pancreas fate conversion both ex vivo and in vivo...
February 13, 2017: Nature Communications
https://www.readbyqxmd.com/read/28192369/synaptic-unc13a-protein-variant-causes-increased-neurotransmission-and-dyskinetic-movement-disorder
#10
Noa Lipstein, Nanda M Verhoeven-Duif, Francesco E Michelassi, Nathaniel Calloway, Peter M van Hasselt, Katarzyna Pienkowska, Gijs van Haaften, Mieke M van Haelst, Ron van Empelen, Inge Cuppen, Heleen C van Teeseling, Annemieke M V Evelein, Jacob A Vorstman, Sven Thoms, Olaf Jahn, Karen J Duran, Glen R Monroe, Timothy A Ryan, Holger Taschenberger, Jeremy S Dittman, Jeong-Seop Rhee, Gepke Visser, Judith J Jans, Nils Brose
Munc13 proteins are essential regulators of neurotransmitter release at nerve cell synapses. They mediate the priming step that renders synaptic vesicles fusion-competent, and their genetic elimination causes a complete block of synaptic transmission. Here we have described a patient displaying a disorder characterized by a dyskinetic movement disorder, developmental delay, and autism. Using whole-exome sequencing, we have shown that this condition is associated with a rare, de novo Pro814Leu variant in the major human Munc13 paralog UNC13A (also known as Munc13-1)...
February 13, 2017: Journal of Clinical Investigation
https://www.readbyqxmd.com/read/28188699/maturation-dependent-control-of-vocal-temporal-plasticity-in-a-songbird
#11
Ryosuke O Tachibana, Miki Takahasi, Neal A Hessler, Kazuo Okanoya
Birdsong is a unique model to address learning mechanisms of the timing control of sequential behaviors, with characteristic temporal structures consisting of serial sequences of brief vocal elements (syllables) and silent intervals (gaps). Understanding the neural mechanisms for plasticity of such sequential behavior should be aided by characterization of its developmental changes. Here, we assessed the level of acute vocal plasticity between young and adult Bengalese finches, and also quantified developmental change in variability of temporal structure...
February 11, 2017: Developmental Neurobiology
https://www.readbyqxmd.com/read/28182007/prenatal-alcohol-exposure-impairs-autophagy-in-neonatal-brain-cortical-microvessels
#12
Virginie Girault, Vianney Gilard, Florent Marguet, Céline Lesueur, Michelle Hauchecorne, Yasmina Ramdani, Annie Laquerrière, Stéphane Marret, Sylvie Jégou, Bruno Jose Gonzalez, Carole Brasse-Lagnel, Soumeya Bekri
Brain developmental lesions are a devastating consequence of prenatal alcohol exposure (PAE). We recently showed that PAE affects cortical vascular development with major effects on angiogenesis and endothelial cell survival. The underlying molecular mechanisms of these effects remain poorly understood. This study aimed at characterizing the ethanol exposure impact on the autophagic process in brain microvessels in human fetuses with fetal alcohol syndrome (FAS) and in a PAE mouse model. Our results indicate that PAE induces an increase of autophagic vacuole number in human fetal and neonatal mouse brain cortical microvessels...
February 9, 2017: Cell Death & Disease
https://www.readbyqxmd.com/read/28174250/direct-conversion-of-root-primordium-into-shoot-meristem-relies-on-timing-of-stem-cell-niche-development
#13
Olga Rosspopoff, Liudmila Chelysheva, Julie Saffar, Lena Lecorgne, Delphine Gey, Erwann Caillieux, Vincent Colot, François Roudier, Pierre Hilson, Richard Berthomé, Marco Da Costa, Philippe Rech
To understand how the identity of an organ can be switched, we studied the transformation of lateral root primordia (LRP) into shoot meristems in Arabidopsis root segments. In this system, the cytokinin-induced conversion does not involve the formation of callus-like structures. Detailed analysis showed that the conversion sequence starts with a mitotic pause and is concomitant with the differential expression of regulators of root and shoot development. The conversion requires the presence of apical stem cells and only LRP at stages VI or VII can be switched...
February 7, 2017: Development
https://www.readbyqxmd.com/read/28174112/epigenetic-basis-of-the-dark-side-of-alcohol-addiction
#14
REVIEW
Subhash C Pandey, Evan Kyzar, Huaibo Zhang
Alcoholism is a complex brain disease characterized by three distinct stages of the addiction cycle that manifest as neuroadaptive changes in the brain. One such stage of the addiction cycle is alcohol withdrawal and the negative affective states that promote drinking and maintain addiction. Repeated alcohol use, genetic predisposition to alcoholism and anxiety, and alcohol exposure during crucial developmental periods all contribute to the development of alcohol-induced withdrawal and negative affective symptoms...
February 4, 2017: Neuropharmacology
https://www.readbyqxmd.com/read/28168441/late-effect-of-developmental-exposure-to-3-3-iminodipropionitrile-on-neurogenesis-in-the-hippocampal-dentate-gyrus-of-mice
#15
Yasuko Hasegawa-Baba, Takeshi Tanaka, Yousuke Watanabe, Liyun Wang, Megu Itahashi, Toshinori Yoshida, Makoto Shibutani
The effects of developmental exposure to 3,3'-iminodipropionitrile (IDPN), a neurotoxicant that causes proximal axonopathy, on mouse hippocampal neurogenesis was examined. Pregnant mice were exposed to IDPN at 0, 600, or 1200 ppm in their drinking water from gestational day 6 to postnatal day (PND) 21. On PND 21, male offspring showed increased postmitotic neuron-specific NeuN-immunoreactive((+)) granule cell numbers in the dentate subgranular zone (SGZ) and granule cell layer (GCL) and decreased glutamate receptor gene Grin2d levels in the dentate gyrus at 1200 ppm...
February 6, 2017: Neurotoxicity Research
https://www.readbyqxmd.com/read/28166730/transcriptome-analysis-reveals-the-complexity-of-alternative-splicing-regulation-in-the-fungus-verticillium-dahliae
#16
Lirong Jin, Guanglin Li, Dazhao Yu, Wei Huang, Chao Cheng, Shengjie Liao, Qijia Wu, Yi Zhang
BACKGROUND: Alternative splicing (AS) regulation is extensive and shapes the functional complexity of higher organisms. However, the contribution of alternative splicing to fungal biology is not well studied. RESULTS: This study provides sequences of the transcriptomes of the plant wilt pathogen Verticillium dahliae, using two different strains and multiple methods for cDNA library preparations. We identified alternatively spliced mRNA isoforms in over a half of the multi-exonic fungal genes...
February 6, 2017: BMC Genomics
https://www.readbyqxmd.com/read/28165010/limb-proportions-show-developmental-plasticity-in-response-to-embryo-movement
#17
A S Pollard, B G Charlton, J R Hutchinson, T Gustafsson, I M McGonnell, J A Timmons, A A Pitsillides
Animals have evolved limb proportions adapted to different environments, but it is not yet clear to what extent these proportions are directly influenced by the environment during prenatal development. The developing skeleton experiences mechanical loading resulting from embryo movement. We tested the hypothesis that environmentally-induced changes in prenatal movement influence embryonic limb growth to alter proportions. We show that incubation temperature influences motility and limb bone growth in West African Dwarf crocodiles, producing altered limb proportions which may, influence post-hatching performance...
February 6, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28163986/neurobiologically-based-treatments-in-rett-syndrome-opportunities-and-challenges
#18
REVIEW
Walter E Kaufmann, Jennifer L Stallworth, David B Everman, Steven A Skinner
Introduction: Rett syndrome (RTT) is an X-linked neurodevelopmental disorder that primarily affects females, typically resulting in a period of developmental regression in early childhood followed by stabilization and severe chronic cognitive, behavioral, and physical disability. No known treatment exists beyond symptomatic management, and while insights into the genetic cause, pathophysiology, neurobiology, and natural history of RTT have been gained, many challenges remain. Areas covered: Based on a comprehensive survey of the primary literature on RTT, this article describes and comments upon the general and unique features of the disorder, genetic and neurobiological bases of drug development, and the history of clinical trials in RTT, with an emphasis on drug trial design, outcome measures, and implementation...
October 2, 2016: Expert Opinion on Orphan Drugs
https://www.readbyqxmd.com/read/28163801/evolutionary-biosemiotics-and-multilevel-construction-networks
#19
Alexei A Sharov
In contrast to the traditional relational semiotics, biosemiotics decisively deviates towards dynamical aspects of signs at the evolutionary and developmental time scales. The analysis of sign dynamics requires constructivism (in a broad sense) to explain how new components such as subagents, sensors, effectors, and interpretation networks are produced by developing and evolving organisms. Semiotic networks that include signs, tools, and subagents are multilevel, and this feature supports the plasticity, robustness, and evolvability of organisms...
December 2016: Biosemiotics
https://www.readbyqxmd.com/read/28159644/developmental-microglial-priming-in-postmortem-autism-spectrum-disorder-temporal-cortex
#20
Andrew S Lee, Efrain C Azmitia, Patricia M Whitaker-Azmitia
Microglia can shift into different complex morphologies depending on the microenvironment of the central nervous system (CNS). The distinct morphologies correlate with specific functions and can indicate the pathophysiological state of the CNS. Previous postmortem studies of autism spectrum disorder (ASD) showed neuroinflammation in ASD indicated by increased microglial density. These changes in the microglia density can be accompanied by changes in microglia phenotype but the individual contribution of different microglia phenotypes to the pathophysiology of ASD remains unclear...
January 31, 2017: Brain, Behavior, and Immunity
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