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https://www.readbyqxmd.com/read/28333924/csl-encodes-a-leucine-rich-repeat-protein-implicated-in-red-violet-light-signaling-to-the-circadian-clock-in-chlamydomonas
#1
Ayumi Kinoshita, Yoshimi Niwa, Kiyoshi Onai, Takashi Yamano, Hideya Fukuzawa, Masahiro Ishiura, Takuya Matsuo
The green alga Chlamydomonas reinhardtii shows various light responses in behavior and physiology. One such photoresponse is the circadian clock, which can be reset by external light signals to entrain its oscillation to daily environmental cycles. In a previous report, we suggested that a light-induced degradation of the clock protein ROC15 is a trigger to reset the circadian clock in Chlamydomonas. However, light signaling pathways of this process remained unclear. Here, we screened for mutants that show abnormal ROC15 diurnal rhythms, including the light-induced protein degradation at dawn, using a luciferase fusion reporter...
March 2017: PLoS Genetics
https://www.readbyqxmd.com/read/28324017/a-novel-selective-bombesin-receptor-subtype-3-agonist-promotes-weight-loss-in-male-diet-induced-obese-rats-with-circadian-rhythm-change
#2
Yasunori Nio, Natsu Hotta, Minoru Maruyama, Kenichi Hamagami, Toshimi Nagi, Masaaki Funata, Junichi Sakamoto, Masanori Nakakariya, Nobuyuki Amano, Tomohiro Okawa, Yasuyoshi Arikawa, Shinobu Sasaki, Shoki Okuda, Shizuo Kasai, Yugo Habata, Yasutaka Nagisa
Bombesin receptor subtype 3 (BRS-3) is an orphan G-protein-coupled receptor. Based on the obese phenotype of male BRS-3-deficient mice, BRS-3 has been considered an attractive target for obesity treatment. Here, we developed a novel selective BRS-3 agonist (Compound-A) and evaluated its anti-obesity effects. Compound-A showed anorectic effects and enhanced energy expenditure in diet-induced obese (DIO)-F344 rats. Moreover, repeated oral administration of Compound-A for 7 days resulted in a significant body weight reduction in DIO-F344 rats...
March 16, 2017: Endocrinology
https://www.readbyqxmd.com/read/28296079/magel2-knockout-mice-manifest-altered-social-phenotypes-and-a-deficit-in-preference-for-social-novelty
#3
Michael D Fountain, Huifang Tao, Chun-An Chen, Jiani Yin, Christian P Schaaf
MAGEL2 is one of five protein-coding, maternally imprinted, paternally expressed genes in the Prader-Willi syndrome-critical domain on chromosome 15q11-q13. Truncating pathogenic variants of MAGEL2 cause Schaaf-Yang syndrome (OMIM #615547), a neurodevelopmental disorder related to Prader-Willi syndrome. Affected individuals manifest a spectrum of neurocognitive and behavioral phenotypes, including intellectual disability and autism spectrum disorder (ASD). Magel2 knockout mice carrying a maternally inherited, imprinted wildtype allele and a paternally inherited Magel2-lacZ knock-in allele, which abolishes endogenous Magel2 gene function, exhibit several features reminiscent of the human Prader-Willi phenotypes, including neonatal growth retardation, excessive weight gain after weaning, and increased adiposity in adulthood...
March 13, 2017: Genes, Brain, and Behavior
https://www.readbyqxmd.com/read/28265120/a-genome-wide-gene-by-trauma-interaction-study-of-alcohol-misuse-in-two-independent-cohorts-identifies-prkg1-as-a-risk-locus
#4
R Polimanti, J Kaufman, H Zhao, H R Kranzler, R J Ursano, R C Kessler, J Gelernter, M B Stein
Traumatic life experiences are associated with alcohol use problems, an association that is likely to be moderated by genetic predisposition. To understand these interactions, we conducted a gene-by-environment genome-wide interaction study (GEWIS) of alcohol use problems in two independent samples, the Army STARRS (STARRS, N=16 361) and the Yale-Penn (N=8084) cohorts. Because the two cohorts were assessed using different instruments, we derived separate dimensional alcohol misuse scales and applied a proxy-phenotype study design...
March 7, 2017: Molecular Psychiatry
https://www.readbyqxmd.com/read/28262759/role-of-a-circadian-relevant-gene-nr1d1-in-brain-development-possible-involvement-in-the-pathophysiology-of-autism-spectrum-disorders
#5
Masahide Goto, Makoto Mizuno, Ayumi Matsumoto, Zhiliang Yang, Eriko F Jimbo, Hidenori Tabata, Takanori Yamagata, Koh-Ichi Nagata
In our previous study, we screened autism spectrum disorder (ASD) patients with and without sleep disorders for mutations in the coding regions of circadian-relevant genes, and detected mutations in several clock genes including NR1D1. Here, we further screened ASD patients for NR1D1 mutations and identified three novel mutations including a de novo heterozygous one c.1499 G > A (p.R500H). We then analyzed the role of Nr1d1 in the development of the cerebral cortex in mice. Acute knockdown of mouse Nr1d1 with in utero electroporation caused abnormal positioning of cortical neurons during corticogenesis...
March 6, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28260126/neuroplasticity-and-second-messenger-pathways-in-antidepressant-efficacy-pharmacogenetic-results-from-a-prospective-trial-investigating-treatment-resistance
#6
Chiara Fabbri, Concetta Crisafulli, Raffaella Calati, Diego Albani, Gianluigi Forloni, Marco Calabrò, Rosalba Martines, Siegfried Kasper, Joseph Zohar, Alzbeta Juven-Wetzler, Daniel Souery, Stuart Montgomery, Julien Mendlewicz, Alessandro Serretti
Genes belonging to neuroplasticity, monoamine, circadian rhythm, and transcription factor pathways were investigated as modulators of antidepressant efficacy. The present study aimed (1) to replicate previous findings in an independent sample with treatment-resistant depression (TRD), and (2) to perform a pathway analysis to investigate the possible molecular mechanisms involved. 220 patients with major depressive disorder who were non-responders to a previous antidepressant were treated with venlafaxine for 4-6 weeks and in case of non-response with escitalopram for 4-6 weeks...
March 4, 2017: European Archives of Psychiatry and Clinical Neuroscience
https://www.readbyqxmd.com/read/28258369/the-alternative-splicing-of-eam8-contributes-to-early-flowering-and-short-season-adaptation-in-a-landrace-barley-from-the-qinghai-tibetan-plateau
#7
Tengfei Xia, Lianquan Zhang, Jinqing Xu, Lei Wang, Baolong Liu, Ming Hao, Xi Chang, Tangwei Zhang, Shiming Li, Huaigang Zhang, Dengcai Liu, Yuhu Shen
The early flowering of Lalu was determined to be due to a novel spontaneous eam8 mutation, which resulted in intron retention and the formation of a putative truncated protein. Barley is a staple crop grown over an extensive area in the Qinghai-Tibetan Plateau. Understanding the genetic mechanism for its success in a high altitude is important for crop improvement in marginal environments. Early flowering is a critical adaptive trait that strongly influences reproductive fitness in a short growing season. Loss-of-function mutations at the circadian clock gene EARLY MATURITY 8 (EAM8) promote rapid flowering...
March 3, 2017: TAG. Theoretical and Applied Genetics. Theoretische und Angewandte Genetik
https://www.readbyqxmd.com/read/28254761/the-reveille-clock-genes-inhibit-growth-of-juvenile-and-adult-plants-by-control-of-cell-size
#8
Jennifer A Gray, Akiva Shalit-Kaneh, Dalena Nhu Chu, Polly Yingshan Hsu, Stacey Harmer
The circadian clock is a complex regulatory network that enhances plant growth and fitness in a constantly changing environment. In Arabidopsis thaliana, the clock is comprised of numerous regulatory feedback loops in which REVEILLE8 (RVE8) and its homologs RVE4 and RVE6 act in a partially redundant manner to promote clock pace. Here, we report that the remaining members of the RVE8 clade, RVE3 and RVE5, play only minor roles in regulation of clock function. However, we find that RVE8 clade proteins have unexpected functions in modulation of light input to the clock and control of plant growth at multiple stages of development...
March 2, 2017: Plant Physiology
https://www.readbyqxmd.com/read/28250106/parallel-analysis-of-arabidopsis-circadian-clock-mutants-reveals-different-scales-of-transcriptome-and-proteome-regulation
#9
Alexander Graf, Diana Coman, R Glen Uhrig, Sean Walsh, Anna Flis, Mark Stitt, Wilhelm Gruissem
The circadian clock regulates physiological processes central to growth and survival. To date, most plant circadian clock studies have relied on diurnal transcriptome changes to elucidate molecular connections between the circadian clock and observable phenotypes in wild-type plants. Here, we have integrated RNA-sequencing and protein mass spectrometry data to comparatively analyse the lhycca1, prr7prr9, gi and toc1 circadian clock mutant rosette at the end of day and end of night. Each mutant affects specific sets of genes and proteins, suggesting that the circadian clock regulation is modular...
March 2017: Open Biology
https://www.readbyqxmd.com/read/28239333/postnatal-light-effects-on-pup-stress-axis-development-are-independent-of-maternal-behavior
#10
Georgia Coleman, Maria M Canal
Postnatal environment shapes brain development during key critical periods. We have recently found that postnatal light environment has long-term effects on the stress and circadian systems, which can lead to altered stress responses, circadian behavior and a depressive phenotype in adulthood. However, it is still unclear how light experience affects the postnatal development of specific stress markers in the pup brain and the role played by maternal behavior and stress. To test this, we raised mice under either light-dark cycles (LD), constant light (LL) or constant darkness (DD) during the suckling stage...
2017: Frontiers in Neuroscience
https://www.readbyqxmd.com/read/28229973/female-conspecifics-restore-rhythmic-singing-behaviour-in-arrhythmic-male-zebra-finches
#11
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
https://www.readbyqxmd.com/read/28219335/stress-responsive-pathways-and-small-rna-changes-distinguish-variable-developmental-phenotypes-caused-by-msh1-loss
#12
Mon-Ray Shao, Sunil Kumar Kenchanmane Raju, John D Laurie, Robersy Sanchez, Sally A Mackenzie
BACKGROUND: Proper regulation of nuclear-encoded, organelle-targeted genes is crucial for plastid and mitochondrial function. Among these genes, MutS Homolog 1 (MSH1) is notable for generating an assortment of mutant phenotypes with varying degrees of penetrance and pleiotropy. Stronger phenotypes have been connected to stress tolerance and epigenetic changes, and in Arabidopsis T-DNA mutants, two generations of homozygosity with the msh1 insertion are required before severe phenotypes begin to emerge...
February 20, 2017: BMC Plant Biology
https://www.readbyqxmd.com/read/28218824/decreased-home-cage-movement-and-oromotor-impairments-in-adult-fmr1-ko-mice
#13
Stephen J Bonasera, Tammy R Chaudoin, Evan H Goulding, Mateusz Mittek, Anna Dunaevsky
Fragile X syndrome (FXS) is a common inherited disorder that significantly impacts family and patient day-to-day living across the entire lifespan. The childhood and adolescent behavioral consequences of FXS are well-appreciated. However, there are significantly fewer studies (except those examining psychiatric comorbidities) assessing behavioral phenotypes seen in adults with FXS. Mice engineered with a genetic lesion of Fmr1 recapitulate important molecular and neuroanatomical characteristics of FXS, and provide a means to evaluate adult behavioral phenotypes associated with FXS...
February 20, 2017: Genes, Brain, and Behavior
https://www.readbyqxmd.com/read/28202598/early-flowering-3-redundancy-fine-tunes-photoperiod-sensitivity
#14
Andrew J S Rubenach, Valerie Fg Hecht, Jacqueline K Vander Schoor, Lim Chee Liew, Gregoire Aubert, Judith Burstin, James L Weller
Three pea loci controlling photoperiod sensitivity, HIGH RESPONSE (HR), DIE NEUTRALIS (DNE) and STERILE NODES (SN) have recently been shown to correspond to orthologs of Arabidopsis circadian clock genes EARLY FLOWERING3 (ELF3), ELF4, and LUX ARRHYTHMO, respectively. A fourth pea locus, PHOTOPERIOD (PPD), also contributes to the photoperiod response in a similar manner to SN and DNE, and recessive ppd mutants on a spring-flowering hr mutant background show early, photoperiod-insensitive flowering. However, the molecular identity of PPD has so far remained elusive...
February 15, 2017: Plant Physiology
https://www.readbyqxmd.com/read/28196492/long-term-microfluidic-tracking-of-coccoid-cyanobacterial-cells-reveals-robust-control-of-division-timing
#15
Feiqiao Brian Yu, Lisa Willis, Rosanna Man Wah Chau, Alessandro Zambon, Mark Horowitz, Devaki Bhaya, Kerwyn Casey Huang, Stephen R Quake
BACKGROUND: Cyanobacteria are important agents in global carbon and nitrogen cycling and hold great promise for biotechnological applications. Model organisms such as Synechocystis sp. and Synechococcus sp. have advanced our understanding of photosynthetic capacity and circadian behavior, mostly using population-level measurements in which the behavior of individuals cannot be monitored. Synechocystis sp. cells are small and divide slowly, requiring long-term experiments to track single cells...
February 14, 2017: BMC Biology
https://www.readbyqxmd.com/read/28186121/astrocyte-deletion-of-bmal1-alters-daily-locomotor-activity-and-cognitive-functions-via-gaba-signalling
#16
Olga Barca-Mayo, Meritxell Pons-Espinal, Philipp Follert, Andrea Armirotti, Luca Berdondini, Davide De Pietri Tonelli
Circadian rhythms are controlled by a network of clock neurons in the central pacemaker, the suprachiasmatic nucleus (SCN). Core clock genes, such as Bmal1, are expressed in SCN neurons and in other brain cells, such as astrocytes. However, the role of astrocytic clock genes in controlling rhythmic behaviour is unknown. Here we show that ablation of Bmal1 in GLAST-positive astrocytes alters circadian locomotor behaviour and cognition in mice. Specifically, deletion of astrocytic Bmal1 has an impact on the neuronal clock through GABA signalling...
February 10, 2017: Nature Communications
https://www.readbyqxmd.com/read/28177832/natural-variation-in-i-circadian-clock-associated-1-i-is-associated-with-flowering-time-in-i-brassica-rapa-i
#17
Hankuil Yi, Xiaonan Li, Seong Ho Lee, Ill-Sup Nou, Yong Pyo Lim, Yoonkang Hur
Flowering time is a very important agronomic trait and the development of molecular markers associated with this trait can facilitate crop breeding. <i>CIRCADIAN CLOCK ASSOCIATED 1</i> (<i>CCA1</i>), a core oscillator component of circadian rhythms that affect metabolic pathways in plants, has been implicated in flowering time control in <i>Brassica</i> species. <i>CCA1</i> gene sequences from three <i>Brassica rapa</i> inbred lines, showing either early flowering or late flowering phenotypes, were analyzed and a high level of ets were designed and tested using various inbred lines of <i>B...
December 22, 2016: Genome Génome / Conseil National de Recherches Canada
https://www.readbyqxmd.com/read/28138105/sleep-problems-as-predictors-in-attention-deficit-hyperactivity-disorder-causal-mechanisms-consequences-and-treatment
#18
REVIEW
Yoo Hyun Um, Seung-Chul Hong, Jong-Hyun Jeong
Attention-deficit hyperactivity disorder (ADHD) is notorious for its debilitating consequences and early age of onset. The need for early diagnosis and intervention has frequently been underscored. Previous studies have attempted to clarify the bidirectional relationship between ADHD and sleep problems, proposing a potential role for sleep problems as early predictors of ADHD. Sleep deprivation, sleep-disordered breathing, and circadian rhythm disturbances have been extensively studied, yielding evidence with regard to their induction of ADHD-like symptoms...
February 28, 2017: Clinical Psychopharmacology and Neuroscience: the Official Scientific Journal of the Korean College of Neuropsychopharmacology
https://www.readbyqxmd.com/read/28116342/subsyndromal-delirium-compared-with-delirium-dementia-and-subjects-without-delirium-or-dementia-in-elderly-general-hospital-admissions-and-nursing-home-residents
#19
Esteban Sepulveda, Maeve Leonard, Jose G Franco, Dimitrios Adamis, Geraldine McCarthy, Colum Dunne, Paula T Trzepacz, Ana M Gaviria, Joan de Pablo, Elisabet Vilella, David J Meagher
INTRODUCTION: Subsyndromal delirium (SSD) complicates diagnosis of delirium and dementia, although there is little research comparing their symptom profiles. METHODS: Cross-sectional study of 400 elderly patients' admission to a general hospital or nursing home diagnosed with delirium, SSD, dementia, or no-delirium/no-dementia (NDND). Symptom profiles were assessed using the Delirium Rating Scale-Revised-98 (DRS-R98). RESULTS: Twenty percent patients had delirium, 19...
2017: Alzheimer's & Dementia: Diagnosis, Assessment & Disease Monitoring
https://www.readbyqxmd.com/read/28112452/disruption-of-dopamine-homeostasis-has-sexually-dimorphic-effects-on-senescence-characteristics-of-drosophila-melanogaster
#20
Andrea Bednářová, Marley E Hanna, Kuntol Rakshit, Janis M O'Donnell, Natraj Krishnan
The neurotransmitter dopamine (DA) is known to be involved in a multitude of physiological processes. We investigated sexually dimorphic effects of disruptions in DA homeostasis and its relationship to senescence using three different Drosophila melanogaster mutants namely Catsup (Catsup(26) ) with elevated DA levels, and pale (ple(2) ), Punch (Pu(Z22) ) with depleted DA levels. In all genotypes including controls, DA levels were significantly lower in old (45-50-day-old) flies compared with young (3-5-day-old) in both sexes...
March 2017: European Journal of Neuroscience
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