keyword
MENU ▼
Read by QxMD icon Read
search

diapause

keyword
https://www.readbyqxmd.com/read/28300610/changes-in-microrna-abundance-may-regulate-diapause-in-the-flesh-fly-sarcophaga-bullata
#1
Julie A Reynolds, Justin T Peyton, David L Denlinger
Diapause, an alternative developmental pathway characterized by changes in developmental timing and metabolism, is coordinated by molecular mechanisms that are not completely understood. MicroRNA (miRNA) mediated gene silencing is emerging as a key component of animal development and may have a significant role in initiating, maintaining, and terminating insect diapause. In the present study, we test this possibility by using high-throughput sequencing and qRT-PCR to discover diapause-related shifts in miRNA abundance in the flesh fly, Sarcophaga bullata...
March 11, 2017: Insect Biochemistry and Molecular Biology
https://www.readbyqxmd.com/read/28292919/molecular-determinants-of-the-regulation-of-development-and-metabolism-by-neuronal-eif2%C3%AE-phosphorylation-in-caenorhabditis-elegans
#2
Warakorn Kulalert, Harini Sadeeshkumar, Ying K Zhang, Frank C Schroeder, Dennis H Kim
Cell-non-autonomous effects of signaling in the nervous system of animals can influence diverse aspects of organismal physiology. We previously showed that phosphorylation of Ser49 of eIF2α in two chemosensory neurons by PEK-1/PERK promotes entry of Caenorhabditis elegans into dauer diapause. Here, we identified and characterized the molecular determinants that confer sensitivity to effects of neuronal eIF2α phosphorylation on development and physiology of C. elegans Isolation and characterization of mutations in eif-2B...
March 14, 2017: Genetics
https://www.readbyqxmd.com/read/28284225/how-does-the-dengue-vector-mosquito-aedes-albopictus-respond-to-global-warming
#3
Pengfei Jia, Xiang Chen, Jin Chen, Liang Lu, Qiyong Liu, Xiaoyue Tan
BACKGROUND: Global warming has a marked influence on the life cycle of epidemic vectors as well as their interactions with human beings. The Aedes albopictus mosquito as the vector of dengue fever surged exponentially in the last decade, raising ecological and epistemological concerns of how climate change altered its growth rate and population dynamics. As the global warming pattern is considerably uneven across four seasons, with a confirmed stronger effect in winter, an emerging need arises as to exploring how the seasonal warming effects influence the annual development of Ae...
March 11, 2017: Parasites & Vectors
https://www.readbyqxmd.com/read/28276459/isolation-mediates-persistent-founder-effects-on-zooplankton-colonisation-in-new-temporary-ponds
#4
Anna Badosa, Dagmar Frisch, Andy J Green, Ciro Rico, Africa Gómez
Understanding the colonisation process in zooplankton is crucial for successful restoration of aquatic ecosystems. Here, we analyzed the clonal and genetic structure of the cyclical parthenogenetic rotifer Brachionus plicatilis by following populations established in new temporary ponds during the first three hydroperiods. Rotifer populations established rapidly after first flooding, although colonisation was ongoing throughout the study. Multilocus genotypes from 7 microsatellite loci suggested that most populations (10 of 14) were founded by few clones...
March 9, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28250105/neuronal-function-of-the-mrna-decapping-complex-determines-survival-of-caenorhabditis-elegans-at-high-temperature-through-temporal-regulation-of-heterochronic-gene-expression
#5
Fivos Borbolis, Christina-Maria Flessa, Fani Roumelioti, George Diallinas, Dimitrios J Stravopodis, Popi Syntichaki
In response to adverse environmental cues, Caenorhabditis elegans larvae can temporarily arrest development at the second moult and form dauers, a diapause stage that allows for long-term survival. This process is largely regulated by certain evolutionarily conserved signal transduction pathways, but it is also affected by miRNA-mediated post-transcriptional control of gene expression. The 5'-3' mRNA decay mechanism contributes to miRNA-mediated silencing of target mRNAs in many organisms but how it affects developmental decisions during normal or stress conditions is largely unknown...
March 2017: Open Biology
https://www.readbyqxmd.com/read/28235563/characterisation-analysis-of-expression-and-localisation-of-circadian-clock-genes-from-the-perspective-of-photoperiodism-in-the-aphid-acyrthosiphon-pisum
#6
Miquel Barberà, Jorge Mariano Collantes-Alegre, David Martínez-Torres
Aphids are typical photoperiodic insects that switch from viviparous parthenogenetic reproduction typical of long day seasons to oviparous sexual reproduction triggered by the shortening of photoperiod in autumn yielding an overwintering egg in which an embryonic diapause takes place. While the involvement of the circadian clock genes in photoperiodism in mammals is well established, there is still some controversy on their participation in insects. The availability of the genome of the pea aphid Acyrthosiphon pisum places this species as an excellent model to investigate the involvement of the circadian system in the aphid seasonal response...
February 22, 2017: Insect Biochemistry and Molecular Biology
https://www.readbyqxmd.com/read/28209779/a-histone-h4-lysine-20-methyltransferase-couples-environmental-cues-to-sensory-neuron-control-of-developmental-plasticity
#7
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/28174072/molecular-characterization-and-functional-analyses-of-a-diapause-hormone-receptor-like-gene-in-parthenogenetic-artemia
#8
Hui-Li Ye, Dong-Rui Li, Jin-Shu Yang, Dian-Fu Chen, Stephanie De Vos, Marnik Vuylsteke, Patrick Sorgeloos, Gilbert Van Stappen, Peter Bossier, Hiromichi Nagasawa, Wei-Jun Yang
In arthropods, mature females under certain conditions produce and release encysted gastrula embryos that enter diapause, a state of obligate dormancy. The process is presumably regulated by diapause hormone (DH) and diapause hormone receptor (DHR) that were identified in the silkworm, Bombyx mori and other insects. However, the molecular structure and function of DHR in crustaceans remains unknown. Here, a DHR-like gene from parthenogenetic Artemia (Ar-DHR) was isolated and sequenced. The cDNA sequence consists of 1410bp with a 1260-bp open reading frame encoding a protein consisting of 420 amino acid residues...
February 4, 2017: Peptides
https://www.readbyqxmd.com/read/28166831/characterization-and-function-analysis-of-a-novel-gene-hc-maoc-1-in-the-parasitic-nematode-haemonochus-contortus
#9
Haojie Ding, Hengzhi Shi, Yu Shi, Xiaolu Guo, Xiuping Zheng, Xueqiu Chen, Qianjin Zhou, Yi Yang, Aifang Du
BACKGROUND: Enoyl-CoA hydratase (MAOC) is required for the biosynthesis of the fatty acid-derive side chains of the ascaroside via peroxisome β-oxidation in the free-living nematode Caenorhabditis elegans. The derivative of dideoxy-sugar, ascarylose is used as dauer pheromones or daumones to induce development of the stress-resistant dauer larvae stage. METHODS: Hc-maoc-1 gene was obtained by searching the Wellcome Trusts Sanger Institute's H. contortus genomic database...
February 6, 2017: Parasites & Vectors
https://www.readbyqxmd.com/read/28161445/is-diapause-an-ancient-adaptation-in-drosophila
#10
Valeria Zonato, Lewis Collins, Mirko Pegoraro, Eran Tauber, Charalambos P Kyriacou
D. melanogaster enters a state of reproductive arrest when exposed to low temperatures (12°C) and shorter photoperiods. A number of studies have suggested that diapause has recently evolved in European D. melanogaster populations, that it is not present in the sibling species D. simulans, that it is non-photoperiodic in American D. melanogaster populations, and that it spontaneously terminates after 6-8weeks. We have studied the overwintering phenotype under different conditions and observe that American, European and, surprisingly, African D...
February 2, 2017: Journal of Insect Physiology
https://www.readbyqxmd.com/read/28144785/afferent-neural-pathways-from-the-photoperiodic-receptor-in-the-bean-bug-riptortus-pedestris
#11
Jili Xi, Ikuyo Toyoda, Sakiko Shiga
Adult diapause in the bean bug, Riptortus pedestris, is controlled by the photoperiod, which is received by retinal cells in the central region of the compound eyes. To resolve the afferent neural pathways involved in the photoperiodic response, we examine fibre projections from the photoperiodic receptors to the brain and investigate the roles of the posterior optic tract (POT) in the photoperiodic response. Reduced-silver impregnation and synapsin immunolabelling revealed that the medulla was divided into nine strata: the outer layer comprises 4 strata, the inner layer comprises 4 strata and a serpentine layer separates the inner and outer layers...
February 1, 2017: Cell and Tissue Research
https://www.readbyqxmd.com/read/28139750/myosuppressin-is-involved-in-the-regulation-of-pupal-diapause-in-the-cabbage-army-moth-mamestra-brassicae
#12
Nobuto Yamada, Hiroshi Kataoka, Akira Mizoguchi
Diapause, a programmed developmental arrest, is common in insects, enabling them to survive adverse seasons. It is well established that pupal diapause is regulated by ecdysteroids secreted by the prothoracic glands (PGs), with cessation of ecdysteroid secretion after pupal ecdysis leading to pupal diapause. A major factor regulating the gland activity is prothoracicotropic hormone (PTTH) secreted from the brain. In our previous study, we demonstrated that the cessation of PTTH release after pupal ecdysis resulted in the inactivation of the PGs, leading to pupal diapause in the cabbage army moth Mamestra brassicae...
January 31, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28131702/geographical-analysis-of-diapause-inducibility-in-european-drosophila-melanogaster-populations
#13
Mirko Pegoraro, Valeria Zonato, Elizabeth R Tyler, Giorgio Fedele, Charalambos P Kyriacou, Eran Tauber
Seasonal overwintering in insects represents an adaptation to stressful environments and in European Drosophila melanogaster females, low temperatures and short photoperiods can induce an ovarian diapause. Diapause may represent a recent (<15Ky) adaptation to the colonisation of temperate Europe by D. melanogaster from tropical sub-Saharan Africa, because African D. melanogaster and the sibling species D. simulans, have been reported to fail to undergo diapause. Over the past few centuries, D. melanogaster have also invaded North America and Australia, and eastern populations on both continents show a predictable latitudinal cline in diapause induction...
January 25, 2017: Journal of Insect Physiology
https://www.readbyqxmd.com/read/28122825/endogenous-rnai-pathways-are-required-in-neurons-for-dauer-formation-in-caenorhabditis-elegans
#14
Pallavi S Bharadwaj, Sarah E Hall
Animals can adapt to unfavorable environments through changes in physiology or behavior. In the nematode, C. elegans, environmental conditions perceived early in development determine whether the animal enters either the reproductive cycle or enters into an alternative diapause stage named dauer. Here, we show that endogenous RNAi pathways play a role in dauer formation in crowding (high pheromone), starvation, and high temperature conditions. Disruption of the Mutator proteins or the nuclear Argonaute CSR-1 result in differential dauer-deficient phenotypes that are dependent upon the experienced environmental stress...
January 25, 2017: Genetics
https://www.readbyqxmd.com/read/28121379/identification-of-ecdysteroidogenic-enzyme-genes-and-their-expression-during-pupal-diapause-in-the-cabbage-armyworm-mamestra-brassicae
#15
M H Ogihara, H Ikeda, N Yamada, J Hikiba, T Nakaoka, Y Fujimoto, Y Suzuki, K Saito, A Mizoguchi, H Kataoka
In this study, we identified ecdysteroidogenic enzymes in the cabbage armyworm, Mamestra brassicae, and demonstrated reduced expression of these genes during diapause. Some insects employ a temporary developmental arrest, diapause, to survive in severe environments. The titres of the moulting hormone ecdysteroid were reduced in diapause pupae of M. brassicae; therefore, ecdysteroidogenesis might be suppressed by a diapause-specific mechanism. To clarify expression changes of ecdysteroidogenic enzyme genes during diapause in M...
January 25, 2017: Insect Molecular Biology
https://www.readbyqxmd.com/read/28115244/identification-expression-pattern-and-functional-characterization-of-as-kip2-in-diapause-embryo-restarting-process-of-artemia-sinica
#16
Mengchen Zhang, Feng Yao, Tong Qin, Lin Hou, Xiangyang Zou
Proper control of the cellular processes requires a variety of regulatory proteins that are involved in the cell cycle, proliferation and apoptosis. Cyclin-dependent kinase inhibitor (CKI) negatively regulates transcription and arrests the cell cycle in G1 phase. KIP2 is a member of CKI family, which could inhibit proliferation by tight-binding with several cyclin-CDK complexes. During the embryonic development of the brine shrimp, Artemia sinica, KIP2 plays a key role in the cell cycle regulation, but the specific mechanisms remain unknown...
April 15, 2017: Gene
https://www.readbyqxmd.com/read/28105571/metal-stress-in-zooplankton-diapause-production-post-hatching-response
#17
Adriana Aránguiz-Acuña, Pablo Pérez-Portilla
Aquatic organisms commonly respond to harsh conditions by forming diapausing stages, which enable populations to survive adverse periods forming egg banks. Production of diapausing eggs is frequently observed in monogonont rotifers, previously changing from asexual to partial sexual reproduction (mixis). In despite that zooplankton are frequently used in ecotoxicological assessment because of their sensitivity to various toxicants and their important role in the ecosystems, toxicity evaluations often consider the directly exposed population produced by parthenogenetic reproduction, exclusively...
January 19, 2017: Ecotoxicology
https://www.readbyqxmd.com/read/28071706/fatty-acid-synthase-2-contributes-to-diapause-preparation-in-a-beetle-by-regulating-lipid-accumulation-and-stress-tolerance-genes-expression
#18
Qian-Qian Tan, Wen Liu, Fen Zhu, Chao-Liang Lei, Xiao-Ping Wang
Diapause, also known as dormancy, is a state of arrested development that allows insects to survive unfavorable environmental conditions. Diapause-destined insects store large amounts of fat when preparing for diapause. However, the extent to which these accumulated fat reserves influence diapause remains unclear. To address this question, we investigated the function of fatty acid synthase (FAS), which plays a central role in lipid synthesis, in stress tolerance, the duration of diapause preparation, and whether insects enter diapause or not...
January 10, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28069423/identification-and-characterization-of-pyrokinin-and-capa-peptides-and-corresponding-gpcrs-from-spotted-wing-drosophila-drosophila-suzukii
#19
Man-Yeon Choi, Seung-Joon Ahn, A Young Kim, Youngho Koh
The family of FXPRLamide peptides serves as a major insect hormone. It is characterized by a core active amino acid sequence conserved at the C-terminal ends, and provides various physiological roles across the Insecta. In this study we identified and characterized pyrokinin (PK) and Capa cDNAs encoding two FXPRLamide peptides, pyrokinin and CAPA-DH (diapause hormone), and two corresponding G-protein-coupled receptors (GPCRs) from spotted wing drosophila (SWD), Drosophila suzukii. Expressions of PK and CAPA mRNAs were differentially observed during all life stages except the embryo, and the detection of CAPA transcription was relatively strong compared with the PK gene in SWD...
January 6, 2017: General and Comparative Endocrinology
https://www.readbyqxmd.com/read/28067941/preliminary-considerations-about-the-presence-of-aedes-albopictus-skuse-1897-diptera-culicidae-during-winter-in-the-northwestern-italy
#20
M Dutto, A Mosca
Aedes albopictus, the Asian tiger mosquito, was unintentionally introduced in Italy at the beginning of the 1990s. In few decades it spread almost in the whole Country. In Piedmont, the first report dates back to 1994. Usually, temperate populations are affected by seasonal temperature and photoperiodicity and can overwinter by producing eggs that undergo a winter diapause. In Rome females of the species extended their trophic activity to the coldest months of the year, but there is no notice about a similar behaviour for northern areas of the Country...
January 2017: Annali di Igiene: Medicina Preventiva e di Comunità
keyword
keyword
35213
1
2
Fetch more papers »
Fetching more papers... Fetching...
Read by QxMD. Sign in or create an account to discover new knowledge that matter to you.
Remove bar
Read by QxMD icon Read
×

Search Tips

Use Boolean operators: AND/OR

diabetic AND foot
diabetes OR diabetic

Exclude a word using the 'minus' sign

Virchow -triad

Use Parentheses

water AND (cup OR glass)

Add an asterisk (*) at end of a word to include word stems

Neuro* will search for Neurology, Neuroscientist, Neurological, and so on

Use quotes to search for an exact phrase

"primary prevention of cancer"
(heart or cardiac or cardio*) AND arrest -"American Heart Association"