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https://www.readbyqxmd.com/read/29689735/erratum-to-modeling-parkinson-s-disease-in-c-elegans
#1
(no author information available yet)
No abstract text is available yet for this article.
March 26, 2018: Journal of Parkinson's Disease
https://www.readbyqxmd.com/read/29689190/how-to-make-a-billion-parasites
#2
Eric S Haag, Te-Wen Lo
Transmission of the human parasite Brugia malayi relies on the sustained production of larvae in blood. In this issue of Developmental Cell,Foray et al. (2018) use methods developed in the model nematode C. elegans to reveal how a symbiotic bacterium supports the female germ cell development underlying this massive fecundity.
April 23, 2018: Developmental Cell
https://www.readbyqxmd.com/read/29688794/spindle-assembly-checkpoint-strength-is-linked-to-cell-fate-in-the-c-elegans-embryo
#3
Abigail R Gerhold, Vincent Poupart, Jean-Claude Labbé, Paul S Maddox
The spindle assembly checkpoint (SAC) is a conserved mitotic regulator that preserves genome stability by monitoring kinetochore-microtubule attachments and blocking anaphase onset until chromosome bi-orientation is achieved. Despite its central role in maintaining mitotic fidelity, the ability of the SAC to delay mitotic exit in the presence of kinetochore-microtubule attachment defects (SAC "strength") appears to vary widely. How different cellular aspects drive this variation remains largely unknown...
April 24, 2018: Molecular Biology of the Cell
https://www.readbyqxmd.com/read/29686301/endocannabinoids-in-caenorhabditis-elegans-are-essential-for-the-mobilization-of-cholesterol-from-internal-reserves
#4
Celina Galles, Gastón M Prez, Sider Penkov, Sebastian Boland, Exequiel O J Porta, Silvia G Altabe, Guillermo R Labadie, Ulrike Schmidt, Hans-Joachim Knölker, Teymuras V Kurzchalia, Diego de Mendoza
Proper cholesterol transport is crucial for the functionality of cells. In C. elegans, certain cholesterol derivatives called dafachronic acids (DAs) govern the entry into diapause. In their absence, worms form a developmentally arrested dauer larva. Thus, cholesterol transport to appropriate places for DA biosynthesis warrants the reproductive growth. Recently, we discovered a novel class of glycosphingolipids, PEGCs, required for cholesterol mobilization/transport from internal storage pools. Here, we identify other components involved in this process...
April 23, 2018: Scientific Reports
https://www.readbyqxmd.com/read/29686107/descending-pathway-facilitates-undulatory-wave-propagation-in-caenorhabditis-elegans-through-gap-junctions
#5
Tianqi Xu, Jing Huo, Shuai Shao, Michelle Po, Taizo Kawano, Yangning Lu, Min Wu, Mei Zhen, Quan Wen
Descending signals from the brain play critical roles in controlling and modulating locomotion kinematics. In the Caenorhabditis elegans nervous system, descending AVB premotor interneurons exclusively form gap junctions with the B-type motor neurons that execute forward locomotion. We combined genetic analysis, optogenetic manipulation, calcium imaging, and computational modeling to elucidate the function of AVB-B gap junctions during forward locomotion. First, we found that some B-type motor neurons generate rhythmic activity, constituting distributed oscillators...
April 23, 2018: Proceedings of the National Academy of Sciences of the United States of America
https://www.readbyqxmd.com/read/29686104/interdependent-and-separable-functions-of-caenorhabditis-elegans-mrn-c-complex-members-couple-formation-and-repair-of-meiotic-dsbs
#6
Chloe Girard, Baptiste Roelens, Karl A Zawadzki, Anne M Villeneuve
Faithful inheritance of genetic information through sexual reproduction relies on the formation of crossovers between homologous chromosomes during meiosis, which, in turn, relies on the formation and repair of numerous double-strand breaks (DSBs). As DSBs pose a potential threat to the genome, mechanisms that ensure timely and error-free DSB repair are crucial for successful meiosis. Here, we identify NBS-1, the Caenorhabditis elegans ortholog of the NBS1 (mutated in Nijmegen Breakage Syndrome) subunit of the conserved MRE11-RAD50-NBS1/Xrs2 (MRN) complex, as a key mediator of DSB repair via homologous recombination (HR) during meiosis...
April 23, 2018: Proceedings of the National Academy of Sciences of the United States of America
https://www.readbyqxmd.com/read/29681853/caffeine-promotes-conversion-of-palmitic-acid-to-palmitoleic-acid-by-inducing-expression-of-fat-5-in-caenorhabditis-elegans-and-scd1-in-mice
#7
Xiaocui Du, Qin Huang, Yun Guan, Ming Lv, Xiaofang He, Chongye Fang, Xuanjun Wang, Jun Sheng
The synthesis and metabolism of fatty acids in an organism is related to many biological processes and is involved in several diseases. The effects of caffeine on fatty acid synthesis and fat storage in Caenorhabditis elegans and mice were studied. After 6 h of food deprivation, adult C. elegans were treated with 0.1 mg/mL caffeine for 24 h. Quantitative reverse-transcription polymerase chain reaction showed that, among all the genes involved in fat accumulation, the mRNA expression of fat-5 in caffeine-treated C...
2018: Frontiers in Pharmacology
https://www.readbyqxmd.com/read/29678692/nucpospred-predicting-species-specific-genomic-nucleosome-positionin-g-via-four-different-modes-of-general-pseknc
#8
Cangzhi Jia, Qing Yang, Quan Zou
The nucleosome is the basic structure of chromatin in eukaryotic cells, with essential roles in the regulation of many biological processes, such as DNA transcription, replication and repair, and RNA splicing. Because of the importance of nucleosomes, the factors that determine their positioning within genomes should be investigated. High-resolution nucleosome-positioning maps are now available for organisms including Saccharomyces cerevisiae, Drosophila melanogaster and Caenorhabditis elegans, enabling the identification of nucleosome positioning by application of computational tools...
April 17, 2018: Journal of Theoretical Biology
https://www.readbyqxmd.com/read/29677132/cd81-receptor-regions-outside-the-large-extracellular-loop-determine-hepatitis-c-virus-entry-into-hepatoma-cells
#9
Pia Banse, Rebecca Moeller, Janina Bruening, Lisa Lasswitz, Sina Kahl, Abdul G Khan, Joseph Marcotrigiano, Thomas Pietschmann, Gisa Gerold
Hepatitis C virus (HCV) enters human hepatocytes using four essential entry factors, one of which is human CD81 (hCD81). The tetraspanin hCD81 contains a large extracellular loop (LEL), which interacts with the E2 glycoprotein of HCV. The role of the non-LEL regions of hCD81 (intracellular tails, four transmembrane domains, small extracellular loop and intracellular loop) is poorly understood. Here, we studied the contribution of these domains to HCV susceptibility of hepatoma cells by generating chimeras of related tetraspanins with the hCD81 LEL...
April 20, 2018: Viruses
https://www.readbyqxmd.com/read/29674686/evolutionary-plasticity-of-the-nhl-domain-underlies-distinct-solutions-to-rna-recognition
#10
Pooja Kumari, Florian Aeschimann, Dimos Gaidatzis, Jeremy J Keusch, Pritha Ghosh, Anca Neagu, Katarzyna Pachulska-Wieczorek, Janusz M Bujnicki, Heinz Gut, Helge Großhans, Rafal Ciosk
RNA-binding proteins regulate all aspects of RNA metabolism. Their association with RNA is mediated by RNA-binding domains, of which many remain uncharacterized. A recently reported example is the NHL domain, found in prominent regulators of cellular plasticity like the C. elegans LIN-41. Here we employ an integrative approach to dissect the RNA specificity of LIN-41. Using computational analysis, structural biology, and in vivo studies in worms and human cells, we find that a positively charged pocket, specific to the NHL domain of LIN-41 and its homologs (collectively LIN41), recognizes a stem-loop RNA element, whose shape determines the binding specificity...
April 19, 2018: Nature Communications
https://www.readbyqxmd.com/read/29673961/metabolic-effects-of-manganese-in-the-nematode-caenorhabditis-elegans-through-daergic-pathway-and-transcription-factors-activation
#11
Priscila Gubert, Bruna Puntel, Tassia Lehmen, Joshua P Fessel, Pan Cheng, Julia Bornhorst, Lucas Siqueira Trindade, Daiana S Avila, Michael Aschner, Felix A A Soares
Manganese (Mn) is an essential trace element for physiological functions since it acts as an enzymatic co-factor. Nevertheless, overexposure to Mn has been associated with a pathologic condition called manganism. Furthermore, Mn has been reported to affect lipid metabolism by mechanisms which have yet to be established. Herein, we used the nematode Caenorhabditis elegans to examine Mn's effects on the dopaminergic (DAergic) system and determine which transcription factors that regulate with lipid metabolism are affected by it...
April 16, 2018: Neurotoxicology
https://www.readbyqxmd.com/read/29673481/cell-autonomous-regulation-of-dendrite-self-avoidance-by-the-wnt-secretory-factor-mig-14-wntless
#12
Chien-Po Liao, Hsun Li, Hsiu-Hsiang Lee, Cheng-Ting Chien, Chun-Liang Pan
Self-avoidance allows sister dendrites from the same neuron to form non-redundant coverage of the sensory territory and is important for neural circuitry functions. Here, we report an unexpected, cell-autonomous role of the Wnt-secretory factor MIG-14/Wntless in mediating dendrite self-avoidance in the C. elegans multidendritic PVD neurons. Similar findings in Drosophila suggest that this novel function of Wntless is conserved. The mig-14 mutant shows defects in dendrite self-avoidance, and ectopic MIG-14 expression triggers dendrite repulsion...
April 18, 2018: Neuron
https://www.readbyqxmd.com/read/29673473/avoiding-sibling-conflict-lessons-from-dendrite-self-avoidance-in-c-elegans
#13
Shelley Halpain
In this issue of Neuron, Liao and colleagues (2018) uncover a surprising way that the guidance molecule MIG14/Wntless operates in dendrite self-avoidance in sensorimotor neurons. Not only does MIG14/Wntless not require the soluble cue Wntless, but it can mediate direct cell-cell contact at the plasma membrane. During dendrite tip contact, MIG14/Wntless drives local bursts of WASP-dependent actin filament assembly that facilitate sister dendrite repulsion.
April 18, 2018: Neuron
https://www.readbyqxmd.com/read/29672507/unconventional-function-of-an-achaete-scute-homolog-as-a-terminal-selector-of-nociceptive-neuron-identity
#14
Neda Masoudi, Saeed Tavazoie, Lori Glenwinkel, Leesun Ryu, Kyuhyung Kim, Oliver Hobert
Proneural genes are among the most early-acting genes in nervous system development, instructing blast cells to commit to a neuronal fate. Drosophila Atonal and Achaete-Scute complex (AS-C) genes, as well as their vertebrate orthologs, are basic helix-loop-helix (bHLH) transcription factors with such proneural activity. We show here that a C. elegans AS-C homolog, hlh-4, functions in a fundamentally different manner. In the embryonic, larval, and adult nervous systems, hlh-4 is expressed exclusively in a single nociceptive neuron class, ADL, and its expression in ADL is maintained via transcriptional autoregulation throughout the life of the animal...
April 2018: PLoS Biology
https://www.readbyqxmd.com/read/29672024/agglomeration-of-escherichia-coli-with-positively-charged-nanoparticles-can-lead-to-artifacts-in-a-standard-caenorhabditis-elegans-toxicity-assay
#15
Shannon K Hanna, Antonio R Montoro Bustos, Alexander W Peterson, Vytas Reipa, Leona D Scanlan, Sanem Hosbas Coskun, Tae Joon Cho, Monique E Johnson, Vincent A Hackley, Bryant C Nelson, Michael R Winchester, John T Elliott, Elijah J Petersen
The increased use and incorporation of engineered nanoparticles (ENPs) in consumer products requires a robust assessment of their potential environmental implications. However, a lack of standardized methods for nanotoxicity testing has yielded results that are sometimes contradictory. Standard ecotoxicity assays may work appropriately for some ENPs with minimal modification, but produce artifactual results for others. Therefore, understanding the robustness of assays for a range of ENPs is critical. In this study, we evaluated the performance of a standard Caenorhabditis elegans (C...
April 19, 2018: Environmental Science & Technology
https://www.readbyqxmd.com/read/29670680/gengnianchun-extends-the-lifespan-of-caenorhabditis-elegans-via-the-insulin-igf-1-signalling-pathway
#16
Fanhui Meng, Jun Li, Yanqiu Rao, Wenjun Wang, Yan Fu
Gengnianchun (GNC), a traditional Chinese medicine (TCM), is believed to have beneficial effects on ageing-related diseases, such as antioxidant properties and effects against A β -induced toxicity. We previously found that GNC extended the lifespan of Caenorhabditis elegans . However, the mechanism underlying this effect was unclear. In this study, we further explored the mechanisms of GNC using a C. elegans model. GNC significantly increased the lifespan of C. elegans and enhanced oxidative and thermal stress resistance...
2018: Oxidative Medicine and Cellular Longevity
https://www.readbyqxmd.com/read/29670202/automated-fluid-delivery-from-multiwell-plates-to-microfluidic-devices-for-high-throughput-experiments-and-microscopy
#17
Ross C Lagoy, Dirk R Albrecht
High-throughput biological and chemical experiments typically use either multiwell plates or microfluidic devices to analyze numerous independent samples in a compact format. Multiwell plates are convenient for screening chemical libraries in static fluid environments, whereas microfluidic devices offer immense flexibility in flow control and dynamics. Interfacing these platforms in a simple and automated way would introduce new high-throughput experimental capabilities, such as compound screens with precise exposure timing...
April 18, 2018: Scientific Reports
https://www.readbyqxmd.com/read/29669598/classification-and-prediction-of-toxicity-of-chemicals-using-an-automated-phenotypic-profiling-of-caenorhabditis-elegans
#18
Shan Gao, Weiyang Chen, Yingxin Zeng, Haiming Jing, Nan Zhang, Matthew Flavel, Markandeya Jois, Jing-Dong J Han, Bo Xian, Guojun Li
BACKGROUND: Traditional toxicological studies have relied heavily on various animal models to understand the effect of various compounds in a biological context. Considering the great cost, complexity and time involved in experiments using higher order organisms. Researchers have been exploring alternative models that avoid these disadvantages. One example of such a model is the nematode Caenorhabditis elegans. There are some advantages of C. elegans, such as small size, short life cycle, well defined genome, ease of maintenance and efficient reproduction...
April 18, 2018: BMC Pharmacology & Toxicology
https://www.readbyqxmd.com/read/29668718/the-caenorhabditis-elegans-gene-ham-1-regulates-daughter-cell-size-asymmetry-primarily-in-divisions-that-produce-a-small-anterior-daughter-cell
#19
Jerome Teuliere, Ismar Kovacevic, Zhirong Bao, Gian Garriga
C. elegans cell divisions that produce an apoptotic daughter cell exhibit Daughter Cell Size Asymmetry (DCSA), producing a larger surviving daughter cell and a smaller daughter cell fated to die. Genetic screens for mutants with defects in apoptosis identified several genes that are also required for the ability of these divisions to produce daughter cells that differ in size. One of these genes, ham-1, encodes a putative transcription factor that regulates a subset of the asymmetric cell divisions that produce an apoptotic daughter cell...
2018: PloS One
https://www.readbyqxmd.com/read/29666474/the-cisd-gene-family-regulates-physiological-germline-apoptosis-through-ced-13-and-the-canonical-cell-death-pathway-in-caenorhabditis-elegans
#20
Skylar D King, Chipo F Gray, Luhua Song, Rachel Nechushtai, Tina L Gumienny, Ron Mittler, Pamela A Padilla
Programmed cell death, which occurs through a conserved core molecular pathway, is important for fundamental developmental and homeostatic processes. The human iron-sulfur binding protein NAF-1/CISD2 binds to Bcl-2 and its disruption in cells leads to an increase in apoptosis. Other members of the CDGSH iron sulfur domain (CISD) family include mitoNEET/CISD1 and Miner2/CISD3. In humans, mutations in CISD2 result in Wolfram syndrome 2, a disease in which the patients display juvenile diabetes, neuropsychiatric disorders and defective platelet aggregation...
April 17, 2018: Cell Death and Differentiation
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