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Circadian biology

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https://www.readbyqxmd.com/read/28345615/transcriptome-analysis-of-molecular-mechanisms-responsible-for-light-stress-response-in-mythimna-separata-walker
#1
Yun Duan, ZhongJun Gong, RenHai Wu, Jin Miao, YueLi Jiang, Tong Li, XiaoBo Wu, YuQing Wu
Light is an important environmental signal for most insects. The Oriental Armyworm, Mythimna separata, is a serious pest of cereal crops worldwide, and is highly sensitive to light signals during its developmental and reproductive stages. However, molecular biological studies of its response to light stress are scarce, and related genomic information is not available. In this study, we sequenced and de novo assembled the transcriptomes of M. separata exposed to four different light conditions: dark, white light (WL), UV light (UVL) and yellow light (YL)...
March 27, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28333377/circadian-rhythms-in-adipose-tissue-physiology
#2
Jana-Thabea Kiehn, Anthony H Tsang, Isabel Heyde, Brinja Leinweber, Isa Kolbe, Alexei Leliavski, Henrik Oster
The different types of adipose tissues fulfill a wide range of biological functions-from energy storage to hormone secretion and thermogenesis-many of which show pronounced variations over the course of the day. Such 24-h rhythms in physiology and behavior are coordinated by endogenous circadian clocks found in all tissues and cells, including adipocytes. At the molecular level, these clocks are based on interlocked transcriptional-translational feedback loops comprised of a set of clock genes/proteins. Tissue-specific clock-controlled transcriptional programs translate time-of-day information into physiologically relevant signals...
March 16, 2017: Comprehensive Physiology
https://www.readbyqxmd.com/read/28331534/ford-and-edison-in-a-modern-regulatory-environment-the-first-in-human-trial-of-night-work-and-artificial-light
#3
EDITORIAL
Thomas C Erren, David M Shaw, Ursula Wild, J Valérie Groß
A thought experiment places Henry Ford and Thomas Alva Edison in a modern regulatory environment. In a utopian occupational world devoid of night-shifts or artificial light, Ford wants to experiment with "working through the night". To support Ford's project, Edison offers his patented electric lamps to "turn nights into days". An ethics committee [EC] does not approve the night-work experiment and Utopia's Food and Drug Administration [FDA] does not approve the potential medical device as safe for use by humans...
2017: Journal of Occupational Medicine and Toxicology
https://www.readbyqxmd.com/read/28321642/circadian-rhythm-dysregulation-in-bipolar-spectrum-disorders
#4
REVIEW
Lauren B Alloy, Tommy H Ng, Madison K Titone, Elaine M Boland
PURPOSE OF REVIEW: We review recent evidence for circadian rhythm dysregulation in bipolar spectrum disorders (BSDs). We examine evidence for endogenous abnormalities in the biological clock and disruptions in the external entrainment of circadian rhythms in BSDs. We also address whether circadian dysregulation provides vulnerability to onset of BSD and evidence for a new integration of reward and circadian dysregulation in BSD. RECENT FINDINGS: Relative circadian phase delay (e...
April 2017: Current Psychiatry Reports
https://www.readbyqxmd.com/read/28321433/transcription-factor-oscillations-in-neural-stem-cells-implications-for-accurate-control-of-gene-expression
#5
REVIEW
Pascal Bielefeld, Marijn Schouten, Paul J Lucassen, Carlos P Fitzsimons
Naturally occurring oscillations in glucocorticoids induce a cyclic activation of the glucocorticoid receptor (GR), a well-characterized ligand-activated transcription factor. These cycles of GR activation/deactivation result in rapid GR exchange at genomic response elements and GR recycling through the chaperone machinery, ultimately generating pulses of GR-mediated transcriptional activity of target genes. In a recent article we have discussed the implications of circadian and high-frequency (ultradian) glucocorticoid oscillations for the dynamic control of gene expression in hippocampal neural stem/progenitor cells (NSPCs) (Fitzsimons et al...
2017: Neurogenesis (Austin, Tex.)
https://www.readbyqxmd.com/read/28318584/short-communication-early-modification-of-the-circadian-organization-of-cow-activity-in-relation-to-disease-or-estrus
#6
Isabelle Veissier, Marie-Madeleine Mialon, Karen Helle Sloth
Biological rhythms are an essential regulator of life. There is evidence that circadian rhythm of activity is disrupted under chronic stress in animals and humans, and it may also be less marked during diseases. Here we investigated whether a detectable circadian rhythm of activity exists in dairy cows in commercial settings using a real-time positioning system. We used CowView (GEA Farm Technologies) to regularly record the individual positions of 350 cows in a Danish dairy farm over 5 mo and to infer the cows' activity (resting, feeding, in alley)...
March 16, 2017: Journal of Dairy Science
https://www.readbyqxmd.com/read/28303945/dependence-of-nighttime-sleep-duration-in-one-month-old-infants-on-alterations-in-natural-and-artificial-photoperiod
#7
Sachiko Iwata, Fumie Fujita, Masahiro Kinoshita, Mitsuaki Unno, Takashi Horinouchi, Seiichi Morokuma, Osuke Iwata
Human sleep-wake cycles are entrained by both natural and artificial light-dark cycles. However, little is known regarding when and how the photoperiod changes entrain the biological clock after conception. To investigate the dependence of sleep patterns in young infants on the natural and artificial light-dark cycles, 1,302 pairs of one-month-old infants and their mothers were asked to answer a questionnaire. Birth in spring, longer daytime sleep duration, early/regular light-off times, and longer maternal nighttime sleep duration were identified as independent variables for longer infant nighttime sleep duration in both univariate and multivariate analyses...
March 17, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28302851/structural-basis-of-the-day-night-transition-in-a-bacterial-circadian-clock
#8
Roger Tseng, Nicolette F Goularte, Archana Chavan, Jansen Luu, Susan E Cohen, Yong-Gang Chang, Joel Heisler, Sheng Li, Alicia K Michael, Sarvind Tripathi, Susan S Golden, Andy LiWang, Carrie L Partch
Circadian clocks are ubiquitous timing systems that induce rhythms of biological activities in synchrony with night and day. In cyanobacteria, timing is generated by a posttranslational clock consisting of KaiA, KaiB, and KaiC proteins and a set of output signaling proteins, SasA and CikA, which transduce this rhythm to control gene expression. Here, we describe crystal and nuclear magnetic resonance structures of KaiB-KaiC,KaiA-KaiB-KaiC, and CikA-KaiB complexes. They reveal how the metamorphic properties of KaiB, a protein that adopts two distinct folds, and the post-adenosine triphosphate hydrolysis state of KaiC create a hub around which nighttime signaling events revolve, including inactivation of KaiA and reciprocal regulation of the mutually antagonistic signaling proteins, SasA and CikA...
March 17, 2017: Science
https://www.readbyqxmd.com/read/28296892/blue-light-induced-accumulation-of-reactive-oxygen-species-is-a-consequence-of-the-drosophila-cryptochrome-photocycle
#9
Louis-David Arthaut, Nathalie Jourdan, Ali Mteyrek, Maria Procopio, Mohamed El-Esawi, Alain d'Harlingue, Pierre-Etienne Bouchet, Jacques Witczak, Thorsten Ritz, André Klarsfeld, Serge Birman, Robert J Usselman, Ute Hoecker, Carlos F Martino, Margaret Ahmad
Cryptochromes are evolutionarily conserved blue-light absorbing flavoproteins which participate in many important cellular processes including in entrainment of the circadian clock in plants, Drosophila and humans. Drosophila melanogaster cryptochrome (DmCry) absorbs light through a flavin (FAD) cofactor that undergoes photoreduction to the anionic radical (FAD•-) redox state both in vitro and in vivo. However, recent efforts to link this photoconversion to the initiation of a biological response have remained controversial...
2017: PloS One
https://www.readbyqxmd.com/read/28295415/adipose-tissue-nad-biology-in-obesity-and-insulin-resistance-from-mechanism-to-therapy
#10
REVIEW
Shintaro Yamaguchi, Jun Yoshino
Nicotinamide adenine dinucleotide (NAD(+) ) biosynthetic pathway, mediated by nicotinamide phosphoribosyltransferase (NAMPT), a key NAD(+) biosynthetic enzyme, plays a pivotal role in controlling many biological processes, such as metabolism, circadian rhythm, inflammation, and aging. Over the past decade, NAMPT-mediated NAD(+) biosynthesis, together with its key downstream mediator, namely the NAD(+) -dependent protein deacetylase SIRT1, has been demonstrated to regulate glucose and lipid metabolism in a tissue-dependent manner...
March 15, 2017: BioEssays: News and Reviews in Molecular, Cellular and Developmental Biology
https://www.readbyqxmd.com/read/28288095/trypanosoma-brucei-metabolism-is-under-circadian-control
#11
Filipa Rijo-Ferreira, Daniel Pinto-Neves, Nuno L Barbosa-Morais, Joseph S Takahashi, Luisa M Figueiredo
The Earth's rotation forced life to evolve under cyclic day and night environmental changes. To anticipate such daily cycles, prokaryote and eukaryote free-living organisms evolved intrinsic clocks that regulate physiological and behavioural processes. Daily rhythms have been observed in organisms living within hosts, such as parasites. Whether parasites have intrinsic molecular clocks or whether they simply respond to host rhythmic physiological cues remains unknown. Here, we show that Trypanosoma brucei, the causative agent of human sleeping sickness, has an intrinsic circadian clock that regulates its metabolism in two different stages of the life cycle...
March 13, 2017: Nature Microbiology
https://www.readbyqxmd.com/read/28276426/microrna-92a-is-a-circadian-modulator-of-neuronal-excitability-in-drosophila
#12
Xiao Chen, Michael Rosbash
Many biological and behavioural processes of animals are governed by an endogenous circadian clock, which is dependent on transcriptional regulation. Here we address post-transcriptional regulation and the role of miRNAs in Drosophila circadian rhythms. At least six miRNAs show cycling expression levels within the pigment dispersing factor (PDF) cell-pacemaker neurons; only mir-92a peaks during the night. In vivo calcium monitoring, dynamics of PDF projections, ArcLight, GCaMP6 imaging and sleep assays indicate that mir-92a suppresses neuronal excitability...
March 9, 2017: Nature Communications
https://www.readbyqxmd.com/read/28265565/the-draft-genome-and-transcriptome-of-the-atlantic-horseshoe-crab-limulus-polyphemus
#13
Stephen D Simpson, Jordan S Ramsdell, Winsor H Watson Iii, Christopher C Chabot
The horseshoe crab, Limulus polyphemus, exhibits robust circadian and circatidal rhythms, but little is known about the molecular mechanisms underlying those rhythms. In this study, horseshoe crabs were collected during the day and night as well as high and low tides, and their muscle and central nervous system tissues were processed for genome and transcriptome sequencing, respectively. The genome assembly resulted in 7.4 × 10(5) contigs with N50 of 4,736, while the transcriptome assembly resulted in 9.3 × 10(4) contigs and N50 of 3,497...
2017: International Journal of Genomics
https://www.readbyqxmd.com/read/28264500/geneanalytics-pathway-analysis-and-genetic-overlap-among-autism-spectrum-disorder-bipolar-disorder-and-schizophrenia
#14
Naveen S Khanzada, Merlin G Butler, Ann M Manzardo
Bipolar disorder (BPD) and schizophrenia (SCH) show similar neuropsychiatric behavioral disturbances, including impaired social interaction and communication, seen in autism spectrum disorder (ASD) with multiple overlapping genetic and environmental influences implicated in risk and course of illness. GeneAnalytics software was used for pathway analysis and genetic profiling to characterize common susceptibility genes obtained from published lists for ASD (792 genes), BPD (290 genes) and SCH (560 genes). Rank scores were derived from the number and nature of overlapping genes, gene-disease association, tissue specificity and gene functions subdivided into categories (e...
February 28, 2017: International Journal of Molecular Sciences
https://www.readbyqxmd.com/read/28261061/molecular-mechanisms-of-bipolar-disorder-progress-made-and-future-challenges
#15
REVIEW
Yeni Kim, Renata Santos, Fred H Gage, Maria C Marchetto
Bipolar disorder (BD) is a chronic and progressive psychiatric illness characterized by mood oscillations, with episodes of mania and depression. The impact of BD on patients can be devastating, with up to 15% of patients committing suicide. This disorder is associated with psychiatric and medical comorbidities and patients with a high risk of drug abuse, metabolic and endocrine disorders and vascular disease. Current knowledge of the pathophysiology and molecular mechanisms causing BD is still modest. With no clear biological markers available, early diagnosis is a great challenge to clinicians without previous knowledge of the longitudinal progress of illness...
2017: Frontiers in Cellular Neuroscience
https://www.readbyqxmd.com/read/28244020/air-travel-circadian-rhythms-hormones-and-autoimmunity
#16
REVIEW
J Torres-Ruiz, A Sulli, M Cutolo, Y Shoenfeld
Biological rhythms are fundamental for homeostasis and have recently been involved in the regulatory processes of various organs and systems. Circadian cycle proteins and hormones have a direct effect on the inflammatory response and have shown pro- or anti-inflammatory effects in animal models of autoimmune diseases. The cells of the immune system have their own circadian rhythm, and the light-dark cycle directly influences the inflammatory response. On the other hand, patients with autoimmune diseases characteristically have sleep disorders and fatigue, and in certain disease, such as rheumatoid arthritis (RA), a frank periodicity in the signs and symptoms is recognized...
February 27, 2017: Clinical Reviews in Allergy & Immunology
https://www.readbyqxmd.com/read/28243223/retinoid-x-receptors-intersect-the-molecular-clockwork-in-the-regulation-of-liver-metabolism
#17
REVIEW
Salvatore De Cosmo, Gianluigi Mazzoccoli
Liver metabolic pathways are driven by the biological clock, and appropriate timing of 24-h patterns of metabolic gene expression as well as anabolic/catabolic processes with wake-related activity/feeding and sleep-related resting/fasting cycles preserves hepatic healthiness. The interplay among the liver metabolic pathways and the molecular clockwork is geared by the nuclear receptors, and ligand-dependent transcription factors that gauge the cellular nutritional status and redox balance, bind hormones and metabolites, and modulate the transcription of thousands target genes through their DNA-binding domain...
2017: Frontiers in Endocrinology
https://www.readbyqxmd.com/read/28241858/machine-learning-identifies-a-compact-gene-set-for-monitoring-the-circadian-clock-in-human-blood
#18
Jacob J Hughey
BACKGROUND: The circadian clock and the daily rhythms it produces are crucial for human health, but are often disrupted by the modern environment. At the same time, circadian rhythms may influence the efficacy and toxicity of therapeutics and the metabolic response to food intake. Developing treatments for circadian dysfunction, as well as optimizing the daily timing of treatments for other health conditions, will require a simple and accurate method to monitor the molecular state of the circadian clock...
February 28, 2017: Genome Medicine
https://www.readbyqxmd.com/read/28235729/impaired-quality-and-efficiency-of-sleep-impairs-cognitive-functioning-in-addison-s-disease
#19
Michelle Henry, Ian Louis Ross, Pedro Sofio Abril Wolf, Kevin Garth Flusk Thomas
BACKGROUND: Standard replacement therapy for Addison's disease (AD) does not restore a normal circadian rhythm. Periods of sub- and supra- physiological cortisol levels experienced by patients with AD likely induce disrupted sleep. Given that healthy sleep plays an important role in memory consolidation, the novelty of the current study was to characterise, using objective measures, the relationship between sleep and memory in patients with AD, and to examine the hypothesis that poor sleep is a biological mechanism underlying memory impairment in those patients...
February 11, 2017: Psychoneuroendocrinology
https://www.readbyqxmd.com/read/28229973/female-conspecifics-restore-rhythmic-singing-behaviour-in-arrhythmic-male-zebra-finches
#20
Neelu Anand Jha, Vinod Kumar
The present study investigated whether pairing with a conspecific female would restore rhythmicity in the singing behaviour of arrhythmic male songbirds. We recorded the singing and, as the circadian response indicator, monitored the activity-rest pattern in male zebra finches (Taeniopygia guttata) housed without or with a conspecific female under 12 h light: 12 h darkness (12L:12D) or constant bright light (LL bright). Both unpaired and paired birds exhibited a significant daily rhythm in the singing and activity behaviour, but paired birds, under 12L:12D, showed a ~2 h extension in the evening...
March 2017: Journal of Biosciences
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