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Circadian biology

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https://www.readbyqxmd.com/read/27918727/the-current-state-of-reproductive-biology-research-in-australia-and-new-zealand-core-themes-from-the-society-for-reproductive-biology-annual-meeting-2016
#1
L K Akison, P H Andraweera, M J Bertoldo, H M Brown, J S M Cuffe, T Fullston, O Holland, J E Schjenken
Because reproduction is essential for all life, it is central to our understanding of all aspects of biology. The Society for Reproductive Biology (SRB) 2016 conference held on the Gold Coast (Qld, Australia) displayed the current breadth of reproductive research in Australia and New Zealand, with additional insights from world leaders in the field. This conference review provides a focused summary of the key questions, emerging ideas and novel technologies that were presented in the symposia. Presented research demonstrated key advances in how stem cell biology may allow us to better understand pluripotency, as well as how environmental and lifestyle factors, such as circadian disruption, smoking, alcohol and diet, affect gametogenesis, embryo implantation, placental function and reproductive capacity...
December 6, 2016: Reproduction, Fertility, and Development
https://www.readbyqxmd.com/read/27916729/enkephalin-and-neuropeptide-y-interaction-in-the-intergeniculate-leaflet-network-a-part-of-the-mammalian-biological-clock
#2
K Palus, L Chrobok, M Kepczynski, M H Lewandowski
The intergeniculate leaflet (IGL) is a flat thalamic nucleus implicated in the modulation of circadian rhythmicity. In rat, two main GABAergic subpopulations can be distinguished in the IGL: neurons synthesising neuropeptide Y (NPY), which directly innervates the suprachiasmatic nuclei, and enkephalinergic cells, which connect contralaterally located leaflets. The aim of this study was to evaluate possible effects of inner IGL neurotransmitters on the spontaneous and synaptic activity of IGL neurons. The data presented in this article provide evidence that enkephalin, and not NPY, could act upon the majority of IGL neurons...
December 1, 2016: Neuroscience
https://www.readbyqxmd.com/read/27916575/circannual-and-circadian-rhythms-of-hypothalamic-dna-methyltransferase-and-histone-deacetylase-expression-in-male-siberian-hamsters-phodopus-sungorus
#3
Tyler J Stevenson
Precise timing of gene transcription is a fundamental component of many biological rhythms. DNA methylation and histone acetylation are two epigenetic modifications that can affect the probability of gene transcription and RNA expression. Enzymes involved in DNA methylation (dnmts) have been shown to exhibit photoperiodic rhythms in expression in the hypothalamus, which coincide with hypothalamic expression of deiodinase type III (dio3), a gene involved in the photoperiodic regulation of reproduction. It is currently unknown whether enzymes involved in histone deacetylation (hdacs) also vary in response to photoperiod, nor have seasonal changes in the circadian waveforms of methylation and/or acetylation enzymes been examined...
December 1, 2016: General and Comparative Endocrinology
https://www.readbyqxmd.com/read/27895820/sleep-circadian-dysrhythmia-obesity-and-diabetes
#4
REVIEW
Gumpeny Ramachandra Sridhar, Narasimhadevara Santhi Nirmala Sanjana
Synchrony of biological processes with environmental cues developed over millennia to match growth, reproduction and senescence. This entails a complex interplay of genetic, metabolic, chemical, light, hormonal and hedonistic factors across life forms. Sleep is one of the most prominent rhythms where such a match is established. Over the past 100 years or so, it has been possible to disturb the synchrony between sleep-wake cycle and environmental cues. Development of electric lights, shift work and continual accessibility of the internet has disrupted this match...
November 15, 2016: World Journal of Diabetes
https://www.readbyqxmd.com/read/27888640/chronotherapy-versus-conventional-statins-therapy-for-the-treatment-of-hyperlipidaemia
#5
REVIEW
Jose Manuel Izquierdo-Palomares, Jesus Maria Fernandez-Tabera, Maria N Plana, Almudena Añino Alba, Pablo Gómez Álvarez, Inmaculada Fernandez-Esteban, Luis Carlos Saiz, Pilar Martin-Carrillo, Óscar Pinar López
BACKGROUND: Elevated levels of total cholesterol and low-density lipoprotein play an important role in the development of atheromas and, therefore, in cardiovascular diseases. Cholesterol biosynthesis follows a circadian rhythm and is principally produced at night (between 12:00 am and 6:00 am). The adjustment of hypolipaemic therapy to biologic rhythms is known as chronotherapy. Chronotherapy is based on the idea that medication can have different effects depending on the hour at which it is taken...
November 26, 2016: Cochrane Database of Systematic Reviews
https://www.readbyqxmd.com/read/27888113/circadian-urinary-citrate-excretion-in-a-rat-model-of-exercise
#6
Paula Nuñez, Irene Diaz, Carmen Perillan, Juan Arguelles, Elena Diaz
AIMS: Circadian rhythms are the approximate 24h biological cycles that function to prepare an organism for daily environmental changes. Circadian rhythms unquestionably play critical roles in metabolic homeostasis and the exercise has emerged as a strong non-photic time cue or zeitgeber in animal models and humans. Numerous studies on the effects of exercise on the citrate synthase activity have been published. Citrate is used to assess energy production or expenditure because it is a substrate of the Krebs Cycle, a cycle for oxidative energy production...
November 22, 2016: Life Sciences
https://www.readbyqxmd.com/read/27885004/circadian-time-signatures-of-fitness-and-disease
#7
REVIEW
Joseph Bass, Mitchell A Lazar
Biological clocks are autonomous anticipatory oscillators that play a critical role in the organization and information processing from genome to whole organisms. Transformative advances into the clock system have opened insight into fundamental mechanisms through which clocks program energy transfer from sunlight into organic matter and potential energy, in addition to cell development and genotoxic stress response. The identification of clocks in nearly every single cell of the body raises questions as to how this gives rise to rhythmic physiology in multicellular organisms and how environmental signals entrain clocks to geophysical time...
November 25, 2016: Science
https://www.readbyqxmd.com/read/27879317/correlated-evolution-between-ck1%C3%AE-and-the-serine-rich-motif-contributes-to-regulating-the-mammalian-circadian-clock
#8
Lijuan Xing, Yang An, Guangsen Shi, Jie Yan, Pancheng Xie, Zhipeng Qu, Zhihui Zhang, Zhiwei Liu, Dejing Pan, Ying Xu
Understanding the mechanism underlying the physiological divergence of species is a long-standing issue in evolutionary biology. The circadian clock is a highly conserved system existing in almost all organisms that regulates a wide range of physiological and behavioral events to adapt to the day-night cycle. Here, the interactions between hCK1δ/ϵ/DBT (Drosophila ortholog of CK1δ/ϵ) and serine rich (SR) motifs from hPER2 (ortholog of Drosophila per) were reconstructed in a Drosophila circadian system. The results indicated that in Drosophila, the SR mutant form hPER2S662G does not recapitulate the mouse or human mutant phenotype...
November 22, 2016: Journal of Biological Chemistry
https://www.readbyqxmd.com/read/27872501/synchronization-of-heterogeneous-oscillators-under-network-modifications-perturbation-and-optimization-of-the-synchrony-alignment-function
#9
Dane Taylor, Per Sebastian Skardal, Jie Sun
Synchronization is central to many complex systems in engineering physics (e.g., the power-grid, Josephson junction circuits, and electro-chemical oscillators) and biology (e.g., neuronal, circadian, and cardiac rhythms). Despite these widespread applications-for which proper functionality depends sensitively on the extent of synchronization-there remains a lack of understanding for how systems can best evolve and adapt to enhance or inhibit synchronization. We study how network modifications affect the synchronization properties of network-coupled dynamical systems that have heterogeneous node dynamics (e...
2016: SIAM Journal on Applied Mathematics
https://www.readbyqxmd.com/read/27871062/unmasking-ultradian-rhythms-in-gene-expression
#10
Daan R van der Veen, Menno P Gerkema
Biological oscillations with an ultradian time scale of 1 to several hours include cycles in behavioral arousal, episodic glucocorticoid release, and gene expression. Ultradian rhythms are thought to have an extrinsic origin because of a perceived absence of ultradian rhythmicity in vitro and a lack of known molecular ultradian oscillators. We designed a novel, non-spectral-analysis method of separating ultradian from circadian components and applied it to a published gene expression dataset with an ultradian sampling resolution...
November 8, 2016: FASEB Journal: Official Publication of the Federation of American Societies for Experimental Biology
https://www.readbyqxmd.com/read/27866957/gender-and-the-circadian-pattern-of-body-temperature-in-normoxia-and-hypoxia
#11
REVIEW
Jacopo P Mortola
Circadian patterns are at the core of many physiological processes, and their disruption can have short- and long-term consequences. This essay focuses on one of the best known patterns, the daily oscillation of body temperature (Tb), and the possibility of its difference between genders. From human and animal studies globally considered, the tentative conclusion is reached that differences in Tb circadian pattern between genders are very small and probably limited to the timing of the Rhythm, not to its amplitude...
November 17, 2016: Respiratory Physiology & Neurobiology
https://www.readbyqxmd.com/read/27856696/the-neurospora-transcription-factor-adv-1-transduces-light-signals-and-temporal-information-to-control-rhythmic-expression-of-genes-involved-in-cell-fusion
#12
Rigzin Dekhang, Cheng Wu, Kristina M Smith, Teresa M Lamb, Matthew Peterson, Erin L Bredeweg, Oneida Ibarra, Jillian M Emerson, Nirmala Karunarathna, Anna Lyubetskaya, Elham Azizi, Jennifer M Hurely, Jay C Dunlap, James E Galagan, Michael Freitag, Matthew S Sachs, Deborah Bell-Pedersen
Light and the circadian clock have a profound effect on the biology of organisms through the regulation of large sets of genes. Towards understanding how light and the circadian clock regulate gene expression, we used genome-wide approaches to identify the direct and indirect targets of the light-responsive and clock-controlled transcription factor ADV-1 in Neurospora crassa A large proportion of ADV-1 targets were found to be light and/or clock-controlled, and enriched for genes involved in development, metabolism, cell growth, and cell fusion...
November 16, 2016: G3: Genes—Genomes—Genetics
https://www.readbyqxmd.com/read/27855737/genetic-basis-of-chronotype-in-humans-insights-from-three-landmark-gwas
#13
David A Kalmbach, Logan D Schneider, Joseph Cheung, Sarah J Bertrand, Thiruchelvam Kariharan, Allan I Pack, Philip R Gehrman
Chronotype, or diurnal preference, refers to behavioral manifestations of the endogenous circadian system that governs preferred timing of sleep and wake. As variations in circadian timing and system perturbations are linked to disease development, the fundamental biology of chronotype has received attention for its role in the regulation and dysregulation of sleep and related medical and psychiatric illnesses. Twin and family studies have shown that chronotype is a heritable trait, thus directing attention toward its genetic basis...
October 28, 2016: Sleep
https://www.readbyqxmd.com/read/27853566/zebrafish-response-to-a-robotic-replica-in-three-dimensions
#14
Tommaso Ruberto, Violet Mwaffo, Sukhgewanpreet Singh, Daniele Neri, Maurizio Porfiri
As zebrafish emerge as a species of choice for the investigation of biological processes, a number of experimental protocols are being developed to study their social behaviour. While live stimuli may elicit varying response in focal subjects owing to idiosyncrasies, tiredness and circadian rhythms, video stimuli suffer from the absence of physical input and rely only on two-dimensional projections. Robotics has been recently proposed as an alternative approach to generate physical, customizable, effective and consistent stimuli for behavioural phenotyping...
October 2016: Royal Society Open Science
https://www.readbyqxmd.com/read/27852644/focusing-on-the-biological-night-towards-an-epidemiological-measure-of-circadian-disruption
#15
EDITORIAL
T C Erren, J V Groß, L Fritschi
No abstract text is available yet for this article.
November 16, 2016: Occupational and Environmental Medicine
https://www.readbyqxmd.com/read/27849618/circadian-rhythms-identified-in-caenorhabditis-elegans-by-in-vivo-long-term-monitoring-of-a-bioluminescent-reporter
#16
María Eugenia Goya, Andrés Romanowski, Carlos S Caldart, Claire Y Bénard, Diego A Golombek
Circadian rhythms are based on endogenous clocks that allow organisms to adjust their physiology and behavior by entrainment to the solar day and, in turn, to select the optimal times for most biological variables. Diverse model systems-including mice, flies, fungi, plants, and bacteria-have provided important insights into the mechanisms of circadian rhythmicity. However, the general principles that govern the circadian clock of Caenorhabditis elegans have remained largely elusive. Here we report robust molecular circadian rhythms in C elegans recorded with a bioluminescence assay in vivo and demonstrate the main features of the circadian system of the nematode...
November 29, 2016: Proceedings of the National Academy of Sciences of the United States of America
https://www.readbyqxmd.com/read/27846817/micrornas-regulate-gene-plasticity-during-cold-shock-in-zebrafish-larvae
#17
I-Chen Hung, Yu-Chuan Hsiao, H Sunny Sun, Tsung-Ming Chen, Shyh-Jye Lee
BACKGROUND: MicroRNAs (miRNAs) are critical regulators responding to acute environmental stresses in both plants and animals. By modulating gene expression, miRNAs either restore or reconstitute a new expression program to enhance cell tolerance to stresses. Cold shock is one of the stresses that can induce acute physiological responses and transcriptional changes in aquatic creatures. Previous genomic studies have revealed many cold-affected genes in fish larvae and adults, however, the role of miRNAs in acute cold response is still ambiguous...
November 15, 2016: BMC Genomics
https://www.readbyqxmd.com/read/27845249/synchronization-to-light-and-mealtime-of-daily-rhythms-of-locomotor-activity-plasma-glucose-and-digestive-enzymes-in-the-nile-tilapia-oreochromis-niloticus
#18
Bartira Guerra-Santos, José Fernando López-Olmeda, Bruno Olivetti de Mattos, Alice Borba Baião, Denise Soledade Peixoto Pereira, Francisco Javier Sánchez-Vázquez, Robson Bahia Cerqueira, Ricardo Castelo Branco Albinati, Rodrigo Fortes-Silva
The light-dark cycle and feeding can be the most important factors acting as synchronizers of biological rhythms. In this research we aimed to evaluate synchronization to feeding schedule of daily rhythms of locomotor activity and digestive enzymes of tilapia. For that purpose, 120 tilapias (65.0±0.6g) were distributed in 12 tanks (10 fish per tank) and divided into two groups. One group was fed once a day at 11:00h (zeitgeber time, ZT6) (ML group) and the other group was fed at 23:00h (ZT18) (MD group). The fish were anesthetized to collect samples of blood, stomach and midgut at 4-hour intervals over a period of 24h...
November 12, 2016: Comparative Biochemistry and Physiology. Part A, Molecular & Integrative Physiology
https://www.readbyqxmd.com/read/27836181/circadian-preferences-oxidative-stress-and-inflammatory-cytokines-in-bipolar-disorder-a-community-study
#19
Thaise Campos Mondin, Taiane de Azevedo Cardoso, Fernada Pedrotti Moreira, Carolina Wiener, Jean Pierre Oses, Luciano Dias de Mattos Souza, Karen Jansen, Pedro Vieira da Silva Magalhães, Flávio Kapczinski, Ricardo Azevedo da Silva
OBJECTIVE: To assess circadian preference among a community sample of people with bipolar disorder, major depression and without any mood disorders. Secondly, we investigated the association of circadian preference with cytokines interleukin-6 (IL-6), interleukin-10 (IL-10) and, tumor necrosis factor alpha (TNF-α) and oxidative stress assessed by thiobarbituric acid reactive substances (TBARS), uric acid and Protein Carbonyl Content (PCC). METHOD: A cross-sectional study nested in a population-based sample...
November 4, 2016: Journal of Neuroimmunology
https://www.readbyqxmd.com/read/27835724/a-systematic-review-of-bright-light-therapy-for-eating-disorders
#20
Marshall T Beauchamp, Jennifer D Lundgren
Objective: Bright light therapy is a noninvasive biological intervention for disorders with nonnormative circadian features. Eating disorders, particularly those with binge-eating and night-eating features, have documented nonnormative circadian eating and mood patterns, suggesting that bright light therapy may be an efficacious stand-alone or adjunctive intervention. The purpose of this systematic literature review, using PRISMA (Preferred Reporting Items for Systematic Reviews and Meta-Analyses) guidelines, was (1) to evaluate the state of the empirical treatment outcome literature on bright light therapy for eating disorders and (2) to explore the timing of eating behavior, mood, and sleep-related symptom change so as to understand potential mechanisms of bright light therapy action in the context of eating disorder treatment...
October 27, 2016: Primary Care Companion to CNS Disorders
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