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Biological clock

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https://www.readbyqxmd.com/read/29150901/expression-of-the-clock-gene-rev-erb%C3%AE-in-the-brain-controls-the-circadian-organization-of-food-intake-and-locomotor-activity-but-not-daily-variations-of-energy-metabolism
#1
Satish Sen, Stéphanie Dumont, Dominique Sage-Ciocca, Sophie Reibel, Paul de Goede, Andries Kalsbeek, Etienne Challet
The nuclear receptor REV-ERBα is part of the molecular clock mechanism and thought to be involved in a variety of biological processes within metabolically active peripheral tissues as well. To investigate whether Rev-erbα (also known as Nr1d1) in the brain plays a role in the daily variations of energy metabolism, feeding behaviour and the sleep-wake cycle, we studied mice with global (GKO) or brain (BKO) deletion of Rev-erbα. Mice were studied both in a light-dark cycle and constant darkness, and 24-h variations of Respiratory quotient (RQ) and energy expenditure, as well as the temporal patterns of rest-activity and feeding behavior were recorded...
November 18, 2017: Journal of Neuroendocrinology
https://www.readbyqxmd.com/read/29149257/eleven-telomere-epigenetic-clock-and-biomarker-composite-quantifications-of-biological-aging-do-they-measure-the-same-thing
#2
Daniel W Belsky, Terrie E Moffitt, Alan A Cohen, David L Corcoran, Morgan E Levine, Joseph A Prinz, Jonathan Schaefer, Karen Sugden, Benjamin Williams, Richie Poulton, Avshalom Caspi
The geroscience hypothesis posits that therapies to slow biological processes of aging can prevent disease and extend healthy years of life. To test such "gero-protective" therapies in humans, outcome measures are needed that can assess extension of disease-free lifespan. This need has spurred development of different methods to quantify biological aging. But different methods have not been systematically compared in the same humans. We implemented seven methods to quantify biological aging using repeated-measures physiological and genomic data in 964 middle-aged humans in the Dunedin Study...
November 15, 2017: American Journal of Epidemiology
https://www.readbyqxmd.com/read/29146117/implications-of-disturbances-in-circadian-rhythms-for-cardiovascular-health-a-new-frontier-in-free-radical-biology
#3
REVIEW
Neelam Khaper, Craig D C Bailey, Nilesh R Ghugre, Cristine Reitz, Zikra Awosanmi, Ryan Waines, Tami A Martino
Cell autonomous circadian "clock" mechanisms are present in virtually every organ, and generate daily rhythms that are important for normal physiology. This is especially relevant to the cardiovascular system, for example the circadian mechanism orchestrates rhythms in heart rate, blood pressure, cardiac contractility, metabolism, gene and protein abundance over the 24-hour day and night cycles. Conversely, disturbing circadian rhythms (e.g. via shift work, sleep disorders) increases cardiovascular disease risk, and exacerbates cardiac remodelling and worsens outcome...
November 13, 2017: Free Radical Biology & Medicine
https://www.readbyqxmd.com/read/29140973/a-coupled-oscillator-model-of-olfactory-bulb-gamma-oscillations
#4
Guoshi Li, Thomas A Cleland
The olfactory bulb transforms not only the information content of the primary sensory representation, but also its underlying coding metric. High-variance, slow-timescale primary odor representations are transformed by bulbar circuitry into secondary representations based on principal neuron spike patterns that are tightly regulated in time. This emergent fast timescale for signaling is reflected in gamma-band local field potentials, presumably serving to efficiently integrate olfactory sensory information into the temporally regulated information networks of the central nervous system...
November 15, 2017: PLoS Computational Biology
https://www.readbyqxmd.com/read/29137171/regulation-of-the-rhythmic-emission-of-plant-volatiles-by-the-circadian-clock
#5
REVIEW
Lanting Zeng, Xiaoqin Wang, Ming Kang, Fang Dong, Ziyin Yang
Like other organisms, plants have endogenous biological clocks that enable them to organize their metabolic, physiological, and developmental processes. The representative biological clock is the circadian system that regulates daily (24-h) rhythms. Circadian-regulated changes in growth have been observed in numerous plants. Evidence from many recent studies indicates that the circadian clock regulates a multitude of factors that affect plant metabolites, especially emitted volatiles that have important ecological functions...
November 13, 2017: International Journal of Molecular Sciences
https://www.readbyqxmd.com/read/29134443/circadian-clock-during-plant-development
#6
Keisuke Inoue, Takashi Araki, Motomu Endo
Plants have endogenous biological clocks that allow organisms to anticipate and prepare for daily and seasonal environmental changes and increase their fitness in changing environments. The circadian clock in plants, as in animals and insects, mainly consists of multiple interlocking transcriptional/translational feedback loops. The circadian clock can be entrained by environmental cues such as light, temperature and nutrient status to synchronize internal biological rhythms with surrounding environments. Output pathways link the circadian oscillator to various physiological, developmental, and reproductive processes for adjusting the timing of these biological processes to an appropriate time of day or a suitable season...
November 13, 2017: Journal of Plant Research
https://www.readbyqxmd.com/read/29129785/advances-in-hypoxia-inducible-factor-biology
#7
REVIEW
Hani Choudhry, Adrian L Harris
Hypoxia-inducible factor (HIF), a central regulator for detecting and adapting to cellular oxygen levels, transcriptionally activates genes modulating oxygen homeostasis and metabolic activation. Beyond this, HIF influences many other processes. Hypoxia, in part through HIF-dependent mechanisms, influences epigenetic factors, including DNA methylation and histone acetylation, which modulate hypoxia-responsive gene expression in cells. Hypoxia profoundly affects expression of many noncoding RNAs classes that have clinicopathological implications in cancer...
November 8, 2017: Cell Metabolism
https://www.readbyqxmd.com/read/29128213/the-effects-of-feeding-a-partial-mixed-ration-plus-a-top-dress-before-feeding-on-milk-production-and-the-daily-rhythm-of-feed-intake-and-plasma-hormones-and-metabolites-in-dairy-cows
#8
M Niu, K J Harvatine
Total mixed rations (TMR) are commonly fed to dairy cows with a goal of reducing ruminal acidosis, but the daily pattern of feed intake has major implication for rumen fermentation and postabsorptive physiology. Generally there is low feed intake during the overnight period and high intake after feeding and during the afternoon. The objective of this study was to determine if feeding a partial mixed ration (PMR) plus a high starch top-dress before feeding of the PMR would improve production and modify key daily rhythms...
November 8, 2017: Journal of Dairy Science
https://www.readbyqxmd.com/read/29126923/clock-interacts-with-ranbp9-and-is-involved-in-alternative-splicing-in-spermatogenesis
#9
Junbao Yang, Zhiwei Zhang, Yingying Zhang, Xulei Zheng, Yilu Lu, Dachang Tao, Yunqiang Liu, Yongxin Ma
The core circadian gene CLOCK plays an important role in regulating male reproduction. However, the underlying mechanism still remains unclear. In the present study, we executed yeast two-hybrid screening using cDNA fragment of CLOCK PAS A domain as bait, and identified RANBP9 as a novel protein interacting with CLOCK. The interaction between CLOCK and RANBP9 was further validated by in vivo and in vitro assays. Previous studies have confirmed that SF3B3 was a RANBP9 interacting protein. Subsequently, our study also found that CLOCK and SF3B3 can interact with each other by co-immunoprecipitation in mouse testis...
November 7, 2017: Gene
https://www.readbyqxmd.com/read/29118260/circadian-actin-dynamics-drive-rhythmic-fibroblast-mobilization-during-wound-healing
#10
Nathaniel P Hoyle, Estere Seinkmane, Marrit Putker, Kevin A Feeney, Toke P Krogager, Johanna E Chesham, Liam K Bray, Justyn M Thomas, Ken Dunn, John Blaikley, John S O'Neill
Fibroblasts are primary cellular protagonists of wound healing. They also exhibit circadian timekeeping, which imparts an approximately 24-hour rhythm to their biological function. We interrogated the functional consequences of the cell-autonomous clockwork in fibroblasts using a proteome-wide screen for rhythmically expressed proteins. We observed temporal coordination of actin regulators that drives cell-intrinsic rhythms in actin dynamics. In consequence, the cellular clock modulates the efficiency of actin-dependent processes such as cell migration and adhesion, which ultimately affect the efficacy of wound healing...
November 8, 2017: Science Translational Medicine
https://www.readbyqxmd.com/read/29113166/expression-of-circadian-clock-genes-in-human-colorectal-adenoma-and-carcinoma
#11
Tomoyuki Momma, Hirokazu Okayama, Masaru Saitou, Hidekazu Sugeno, Nobuhiro Yoshimoto, Yuji Takebayashi, Shinji Ohki, Seiichi Takenoshita
Circadian rhythms are fundamental biological systems in most organisms. Epidemiological and animal studies have demonstrated that disruption of circadian rhythms is linked to tumor progression and mammalian tumorigenesis. However, the clinical significance of in situ clock gene expression in precancerous and cancerous colorectal lesions remains unknown. The present study aimed to investigate mRNA transcript levels of circadian clock genes within human colorectal cancer and adenoma tissue sections. Using in situ hybridization, the expression of key clock genes, including period circadian protein homolog (Per) 1 and 2, cryptochrome 1 (Cry1), circadian locomoter output cycles protein kaput (Clock), brain and muscle ARNT-like protein 1 (Bmal1) and casein kinase 1ε (CK1ε) were retrospectively examined in 51 cases of colorectal carcinoma and 10 cases of adenoma...
November 2017: Oncology Letters
https://www.readbyqxmd.com/read/29113149/research-progress-on-circadian-clock-genes-in-common-abdominal-malignant-tumors
#12
Sheng-Li Yang, Quan-Guang Ren, Lu Wen, Jian-Li Hu, Heng-Yi Wang
The circadian clock refers to the inherent biological rhythm of an organism, which, is accurately regulated by numerous clock genes. Studies in recent years have reported that the abnormal expression of clock genes is ubiquitous in common abdominal malignant tumors, including liver, colorectal, gastric and pancreatic cancer. In addition, the abnormal expression of certain clock genes is closely associated with clinical tumor parameters or patient prognosis. Studies in clock genes may expand the knowledge about the mechanism of occurrence and development of tumors, and may provide a new approach for tumor therapy...
November 2017: Oncology Letters
https://www.readbyqxmd.com/read/29113012/the-suprachiasmatic-nucleus-drives-day-night-variations-in-postprandial-triglyceride-uptake-into-skeletal-muscle-and-brown-adipose-tissue
#13
Sofía Moran-Ramos, Natali N Guerrero-Vargas, Rebeca Mendez-Hernandez, Maria Del Carmen Basualdo, Carolina Escobar, Ruud M Buijs
What is the central question of this study? What are the factors influencing day-night variations in postprandial triglycerides? What is the main finding and its importance? Rats show low postprandial plasma triglyceride concentrations early in the active period that are attributable to a higher uptake by skeletal muscle and brown adipose tissue. We show that these day-night variations in uptake are driven by the suprachiasmatic nucleus, probably via a Rev-erbα-mediated mechanism and independent of locomotor activity...
November 7, 2017: Experimental Physiology
https://www.readbyqxmd.com/read/29103939/stability-of-wake-sleep-cycles-requires-robust-degradation-of-the-period-protein
#14
Matthew D'Alessandro, Stephen Beesley, Jae Kyoung Kim, Zachary Jones, Rongmin Chen, Julie Wi, Kathleen Kyle, Daniel Vera, Michele Pagano, Richard Nowakowski, Choogon Lee
Robustness in biology is the stability of phenotype under diverse genetic and/or environmental perturbations. The circadian clock has remarkable stability of period and phase that-unlike other biological oscillators-is maintained over a wide range of conditions. Here, we show that the high fidelity of the circadian system stems from robust degradation of the clock protein PERIOD. We show that PERIOD degradation is regulated by a balance between ubiquitination and deubiquitination, and that disruption of this balance can destabilize the clock...
October 24, 2017: Current Biology: CB
https://www.readbyqxmd.com/read/29099875/daily-rhythms-and-enrichment-patterns-in-the-transcriptome-of-the-behavior-manipulating-parasite-ophiocordyceps-kimflemingiae
#15
Charissa de Bekker, Ian Will, David P Hughes, Andreas Brachmann, Martha Merrow
Various parasite-host interactions that involve adaptive manipulation of host behavior display time-of-day synchronization of certain events. One example is the manipulated biting behavior observed in Carpenter ants infected with Ophiocordyceps unilateralis sensu lato. We hypothesized that biological clocks play an important role in this and other parasite-host interactions. In order to identify candidate molecular clock components, we used two general strategies: bioinformatics and transcriptional profiling...
2017: PloS One
https://www.readbyqxmd.com/read/29098954/guidelines-for-genome-scale-analysis-of-biological-rhythms
#16
Michael E Hughes, Katherine C Abruzzi, Ravi Allada, Ron Anafi, Alaaddin Bulak Arpat, Gad Asher, Pierre Baldi, Charissa de Bekker, Deborah Bell-Pedersen, Justin Blau, Steve Brown, M Fernanda Ceriani, Zheng Chen, Joanna C Chiu, Juergen Cox, Alexander M Crowell, Jason P DeBruyne, Derk-Jan Dijk, Luciano DiTacchio, Francis J Doyle, Giles E Duffield, Jay C Dunlap, Kristin Eckel-Mahan, Karyn A Esser, Garret A FitzGerald, Daniel B Forger, Lauren J Francey, Ying-Hui Fu, Frédéric Gachon, David Gatfield, Paul de Goede, Susan S Golden, Carla Green, John Harer, Stacey Harmer, Jeff Haspel, Michael H Hastings, Hanspeter Herzel, Erik D Herzog, Christy Hoffmann, Christian Hong, Jacob J Hughey, Jennifer M Hurley, Horacio O de la Iglesia, Carl Johnson, Steve A Kay, Nobuya Koike, Karl Kornacker, Achim Kramer, Katja Lamia, Tanya Leise, Scott A Lewis, Jiajia Li, Xiaodong Li, Andrew C Liu, Jennifer J Loros, Tami A Martino, Jerome S Menet, Martha Merrow, Andrew J Millar, Todd Mockler, Felix Naef, Emi Nagoshi, Michael N Nitabach, Maria Olmedo, Dmitri A Nusinow, Louis J Ptáček, David Rand, Akhilesh B Reddy, Maria S Robles, Till Roenneberg, Michael Rosbash, Marc D Ruben, Samuel S C Rund, Aziz Sancar, Paolo Sassone-Corsi, Amita Sehgal, Scott Sherrill-Mix, Debra J Skene, Kai-Florian Storch, Joseph S Takahashi, Hiroki R Ueda, Han Wang, Charles Weitz, Pål O Westermark, Herman Wijnen, Ying Xu, Gang Wu, Seung-Hee Yoo, Michael Young, Eric Erquan Zhang, Tomasz Zielinski, John B Hogenesch
Genome biology approaches have made enormous contributions to our understanding of biological rhythms, particularly in identifying outputs of the clock, including RNAs, proteins, and metabolites, whose abundance oscillates throughout the day. These methods hold significant promise for future discovery, particularly when combined with computational modeling. However, genome-scale experiments are costly and laborious, yielding "big data" that are conceptually and statistically difficult to analyze. There is no obvious consensus regarding design or analysis...
October 2017: Journal of Biological Rhythms
https://www.readbyqxmd.com/read/29092409/dissipative-structures-and-biological-rhythms
#17
Albert Goldbeter
Sustained oscillations abound in biological systems. They occur at all levels of biological organization over a wide range of periods, from a fraction of a second to years, and with a variety of underlying mechanisms. They control major physiological functions, and their dysfunction is associated with a variety of physiological disorders. The goal of this review is (i) to give an overview of the main rhythms observed at the cellular and supracellular levels, (ii) to briefly describe how the study of biological rhythms unfolded in the course of time, in parallel with studies on chemical oscillations, (iii) to present the major roles of biological rhythms in the control of physiological functions, and (iv) the pathologies associated with the alteration, disappearance, or spurious occurrence of biological rhythms...
October 2017: Chaos
https://www.readbyqxmd.com/read/29082123/ocular-surface-chemical-injury-treated-by-regenerating-agent-rgta-cacicol20
#18
Melih Ustaoglu, Nilgun Solmaz, Feyza Onder
Objective: To present the successful outcome of regenerating agent (RGTA) treatment in a patient with severe ocular surface chemical injury. Methods: Case report Results: A 14-year-old female patient was admitted to our clinic following chemical burn in the left eye. Her best corrected visual acuity (BCVA) was 20/40; and she had total corneal and 75% conjunctival epithelial loss, corneal haze, and limbal ischemia for nine clock hours in the left eye. The patient had already received standard therapy consisting of patching, preservative-free artificial tears, topical netilmicin, topical dexamethasone, oral doxycycline, and vitamin C for two weeks...
2017: GMS Ophthalmology Cases
https://www.readbyqxmd.com/read/29081695/aging-as-an-epigenetic-phenomenon
#19
REVIEW
Vasily V Ashapkin, Lyudmila I Kutueva, Boris F Vanyushin
INTRODUCTION: Hypermethylation of genes associated with promoter CpG islands, and hypomethylation of CpG poor genes, repeat sequences, transposable elements and intergenic genome sections occur during aging in mammals. Methylation levels of certain CpG sites display strict correlation to age and could be used as "epigenetic clock" to predict biological age. Multi-substrate deacetylases SIRT1 and SIRT6 affect aging via locus-specific modulations of chromatin structure and activity of multiple regulatory proteins involved in aging...
October 2017: Current Genomics
https://www.readbyqxmd.com/read/29072179/the-role-of-chronobiology-as-transdisciplinary-field-of-research-application-to-psychiatry
#20
Okan Çalıyurt
Chronobiology is a field that studies the effects of time on biological systems. Periodicity is of particular interest. The master biological clock in the suprachiasmatic nucleus controls daily rhythms of core body temperature, rest-activity cycle, physiological and behavioral functions, psychomotor functions and mood in humans. The clock genes are involved in the generation of the circadian rhythms and the biological clock is synchronized to solar day by direct photic inputs. Various circadian rhythm abnormalities have been demonstrated in mood disorders such as unipolar depression, bipolar depression and seasonal affective disorder...
October 26, 2017: Balkan Medical Journal
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