keyword
MENU ▼
Read by QxMD icon Read
search

c.elegans

keyword
https://www.readbyqxmd.com/read/29168500/a-lysosomal-switch-triggers-proteostasis-renewal-in-the-immortal-c-elegans-germ-lineage
#1
K Adam Bohnert, Cynthia Kenyon
Although individuals age and die with time, an animal species can continue indefinitely, because of its immortal germ-cell lineage. How the germline avoids transmitting damage from one generation to the next remains a fundamental question in biology. Here we identify a lysosomal switch that enhances germline proteostasis before fertilization. We find that Caenorhabditis elegans oocytes whose maturation is arrested by the absence of sperm exhibit hallmarks of proteostasis collapse, including protein aggregation...
November 22, 2017: Nature
https://www.readbyqxmd.com/read/29168308/demonstrating-improved-multiple-transport-mean-free-path-imaging-capabilities-of-light-sheet-microscopy-in-the-quantification-of-fluorescence-dynamics
#2
Matthias Rieckher, Stylianos Psycharakis, Daniele Ancora, Evangelos Liapis, Athanasios Zacharopoulos, Jorge Ripoll, Nektarios Tavernarakis, Giannis Zacharakis
Optical microscopy constitutes one of the most fundamental paradigms for the understanding of complex biological mechanisms in the whole-organism and live-tissue context. Novel imaging techniques such as light sheet fluorescence microscopy (LSFM) and optical projection tomography (OPT) combined with phase-retrieval algorithms (PRT) can produce highly-resolved 3D images in multiple transport-mean-free-path scales. Our study aims to exemplify the microscopic capabilities of LSFM when imaging protein dynamics in Caenorhabditis elegans and the distribution of necrotic cells in cancer cell spheroids...
November 23, 2017: Biotechnology Journal
https://www.readbyqxmd.com/read/29167662/site-directed-mutagenesis-study-revealed-three-important-residues-in-hc-daf-22-a-key-enzyme-regulating-diapause-of-haemonchus-contortus
#3
Yan Huang, Xiuping Zheng, Hongli Zhang, Haojie Ding, Xiaolu Guo, Yi Yang, Xueqiu Chen, Qianjin Zhou, Aifang Du
Haemonchus contortus (H. contortus) is one of the most important parasites of small ruminants, especially goats and sheep. The complex life cycle of this nematode is a main obstacle for the control and prevention of haemonchosis. So far, a special form of arrested development called diapause different from the dauer stage in Caenorhabditis elegans (C. elegans) has been found in many parasitic nematodes. In our previous study, we have characterized a novel gene Hc-daf-22 from H. contortus sharing high homology with Ce-daf-22 and functional analysis showed this gene has similar biological function with Ce-daf-22...
2017: Frontiers in Microbiology
https://www.readbyqxmd.com/read/29167374/fmrfamide-like-peptides-expand-the-behavioral-repertoire-of-a-densely-connected-nervous-system
#4
James Siho Lee, Pei-Yin Shih, Oren N Schaedel, Porfirio Quintero-Cadena, Alicia K Rogers, Paul W Sternberg
Animals, including humans, can adapt to environmental stress through phenotypic plasticity. The free-living nematode Caenorhabditis elegans can adapt to harsh environments by undergoing a whole-animal change, involving exiting reproductive development and entering the stress-resistant dauer larval stage. The dauer is a dispersal stage with dauer-specific behaviors for finding and stowing onto carrier animals, but how dauers acquire these behaviors, despite having a physically limited nervous system of 302 neurons, is poorly understood...
November 22, 2017: Proceedings of the National Academy of Sciences of the United States of America
https://www.readbyqxmd.com/read/29167199/the-germline-specific-factor-oef-1-facilitates-coordinated-progression-through-germ-cell-cevelopment-in-caenorhabditis-elegans
#5
Catherine McManus, Valerie Reinke
The purpose of germ cells is to ensure the faithful transmission of genetic material to the next generation. In order to develop into mature gametes, germ cells must pass through cell cycle checkpoints while maintaining totipotency and genomic integrity. How germ cells coordinate developmental events while simultaneously protecting their unique fate is not well understood. Here we characterize a novel nuclear protein OEF-1 with highly specific germline expression in C. elegans OEF-1 is initially detected early in embryogenesis and is expressed in the nuclei of all germ cells during larval stages...
November 22, 2017: Genetics
https://www.readbyqxmd.com/read/29165668/electrophysiological-measures-of-aging-pharynx-function-in-c-elegans-reveal-enhanced-organ-functionality-in-older-long-lived-mutants
#6
Joshua Coulter Russell, Nikolay Burnaevskiy, Bridget Ma, Miguel Arenas Mailig, Franklin Faust, Matt Crane, Matt Kaeberlein, Alexander Mendenhall
The function of the pharynx, an organ in the model system Caenorhabditis elegans, has been correlated with lifespan and motility (another measure of health) since 1980. In this study, in order to further understand the relationship between organ function and lifespan, we measured the age-related decline of the pharynx using an electrophysiological approach. We measured and analyzed electropharyngeograms of wild type animals, short-lived hsf-1 mutants, and long-lived animals with genetically decreased insulin signaling or increased heat shock pathway signaling; we recorded a total of 2,478 electropharyngeograms from 1,374 individuals...
November 18, 2017: Journals of Gerontology. Series A, Biological Sciences and Medical Sciences
https://www.readbyqxmd.com/read/29163672/contribution-of-riboflavin-supply-pathways-to-vibrio-cholerae-in-different-environments
#7
Andrés Fuentes Flores, Ignacio Sepúlveda Cisternas, José Ignacio Vásquez Solis de Ovando, Alexia Torres, Víctor Antonio García-Angulo
Background: The waterborne diarrheagenic bacterium Vibrio cholerae, cause of the pandemic cholera disease, thrives in a variety of environments ranging from estuarine waters to the human intestinal tract. This species has two ways to obtain the essential micronutrient riboflavin, de novo biosynthesis and environmental uptake through the RibN importer. The way these functions interrelate to fulfill riboflavin needs in different conditions in this species is unknown. Results: This study analyzed the contributions of riboflavin biosynthesis and transport to the culturability of Vibrio cholerae in river and seawater in vitro and in the Caenorhabditis elegans nematode host model...
2017: Gut Pathogens
https://www.readbyqxmd.com/read/29162682/caenorhabditis-elegans-dbl-1-bmp-regulates-lipid-accumulation-via-interaction-with-insulin-signaling
#8
James F Clark, Michael Meade, Gehan Ranepura, David H Hall, Cathy Savage-Dunn
Metabolic homeostasis is coordinately controlled by diverse inputs. Understanding these regulatory networks is vital to combating metabolic disorders. The nematode Caenorhabditis elegans has emerged as a powerful, genetically tractable model system for the discovery of lipid regulatory mechanisms. Here we introduce DBL-1, the C. elegans homolog of bone morphogenetic protein 2/4 (BMP2/4), as a significant regulator of lipid homeostasis. We used neutral lipid staining and a lipid droplet marker to demonstrate that both increases and decreases in DBL-1/BMP signaling result in reduced lipid stores and lipid droplet count...
November 21, 2017: G3: Genes—Genomes—Genetics
https://www.readbyqxmd.com/read/29161591/cell-invasion-in%C3%A2-vivo-via-rapid-exocytosis-of-a-transient-lysosome-derived-membrane-domain
#9
Kaleb M Naegeli, Eric Hastie, Aastha Garde, Zheng Wang, Daniel P Keeley, Kacy L Gordon, Ariel M Pani, Laura C Kelley, Meghan A Morrissey, Qiuyi Chi, Bob Goldstein, David R Sherwood
Invasive cells use small invadopodia to breach basement membrane (BM), a dense matrix that encases tissues. Following the breach, a large protrusion forms to clear a path for tissue entry by poorly understood mechanisms. Using RNAi screening for defects in Caenorhabditis elegans anchor cell (AC) invasion, we found that UNC-6(netrin)/UNC-40(DCC) signaling at the BM breach site directs exocytosis of lysosomes using the exocyst and SNARE SNAP-29 to form a large protrusion that invades vulval tissue. Live-cell imaging revealed that the protrusion is enriched in the matrix metalloprotease ZMP-1 and transiently expands AC volume by more than 20%, displacing surrounding BM and vulval epithelium...
November 20, 2017: Developmental Cell
https://www.readbyqxmd.com/read/29160768/diverse-modes-of-synaptic-signaling-regulation-and-plasticity-distinguish-classes-of-c-elegans-glutamatergic-neurons
#10
Donovan Ventimiglia, Cornelia I Bargmann
Synaptic vesicle release properties vary between neuronal cell types, but in most cases the molecular basis of this heterogeneity is unknown. Here, we compare in vivo synaptic properties of two neuronal classes in the C. elegans central nervous system, using VGLUT-pHluorin to monitor synaptic vesicle exocytosis and retrieval in intact animals. We show that the glutamatergic sensory neurons AWC(ON) and ASH have distinct synaptic dynamics associated with tonic and phasic synaptic properties, respectively. Exocytosis in ASH and AWC(ON) is differentially affected by SNARE-complex regulators that are present in both neurons: phasic ASH release is strongly dependent on UNC-13, whereas tonic AWC(ON) release relies upon UNC-18 and on the protein kinase C homolog PKC-1...
November 21, 2017: ELife
https://www.readbyqxmd.com/read/29160206/an-orphan-cbb3-type-cytochrome-oxidase-subunit-supports-pseudomonas-aeruginosa-biofilm-growth-and-virulence
#11
Jeanyoung Jo, Krista L Cortez, William Cole Cornell, Alexa Price-Whelan, Lars Ep Dietrich
Hypoxia is a common challenge faced by bacteria during associations with hosts due in part to the formation of densely packed communities (biofilms). cbb3-type cytochrome c oxidases, which catalyze the terminal step in respiration and have a high affinity for oxygen, have been linked to bacterial pathogenesis. The pseudomonads are unusual in that they often contain multiple full and partial (i.e. 'orphan') operons for cbb3-type oxidases and oxidase subunits. Here, we describe a unique role for the orphan catalytic subunit CcoN4 in colony biofilm development and respiration in the opportunistic pathogen Pseudomonas aeruginosa PA14...
November 21, 2017: ELife
https://www.readbyqxmd.com/read/29160205/clarinet-cla-1-a-novel-active-zone-protein-required-for-synaptic-vesicle-clustering-and-release
#12
Zhao Xuan, Laura Manning, Jessica Nelson, Janet E Richmond, Daniel A Colón-Ramos, Kang Shen, Peri T Kurshan
Active zone proteins cluster synaptic vesicles at presynaptic terminals and coordinate their release. In forward genetic screens we isolated a novel C. elegans active zone gene, clarinet (cla-1). cla-1 mutants exhibit defects in synaptic vesicle clustering, active zone structure and synapse number. As a result, they have reduced spontaneous vesicle release and increased synaptic depression. cla-1 mutants show defects in vesicle distribution near the presynaptic dense projection, with fewer undocked vesicles contacting the dense projection and more docked vesicles at the plasma membrane...
November 21, 2017: ELife
https://www.readbyqxmd.com/read/29159707/propionyl-coa-carboxylase-pcca-1-and-pccb-1-gene-deletions-in-caenorhabditis-elegans-globally-impair-mitochondrial-energy-metabolism
#13
Kimberly A Chapman, Julian Ostrovsky, Meera Rao, Stephen D Dingley, Erzsebet Polyak, Marc Yudkoff, Rui Xiao, Michael J Bennett, Marni J Falk
Propionic acidemia (PA) is a classical inborn error of metabolism with high morbidity that results from the inability of the propionyl-CoA carboxylase (PCC) enzyme to convert propionyl-CoA to methylmalonyl-CoA. PA is inherited in an autosomal recessive fashion due to functional loss of both alleles of either PCCA or PCCB. These genes are highly conserved across evolutionarily diverse species and share extensive similarity with pcca-1 and pccb-1 in the nematode, Caenorhabditis elegans. Here, we report the global metabolic effects of deletion in a single PCC gene, either pcca-1 or pccb-1, in C...
November 20, 2017: Journal of Inherited Metabolic Disease
https://www.readbyqxmd.com/read/29158292/sphingomyelin-metabolism-is-a-regulator-of-kras-function
#14
Dharini van der Hoeven, Kwang-Jin Cho, Yong Zhou, Xiaoping Ma, Wei Chen, Ali Naji, Dina Montufar-Solis, Yan Zuo, Sarah E Kovar, Kandice R Levental, Jeffrey A Frost, Ransome van der Hoeven, John F Hancock
KRAS must localize to the plasma membrane (PM) for biological activity. We show here that multiple acid sphingomyelinase (ASM) inhibitors, including tricyclic antidepressants, mislocalized phosphatidylserine (PtdSer) and KRASG12V from the PM; resulting in abrogation of KRASG12V signaling and potent, selective growth inhibition of mutant KRAS transformed cancer cells. Concordantly, in nude mice, the ASM inhibitor fendiline decreased the rate of growth of oncogenic KRAS-expressing MiaPaCa-2 tumors, but had no effect on the growth of the wild-type KRAS-expressing BxPC-3 tumors...
November 20, 2017: Molecular and Cellular Biology
https://www.readbyqxmd.com/read/29158261/the-biotin-ligating-protein-bpl-1-is-critical-for-lipid-biosynthesis-and-polarization-of-the-caenorhabditis-elegans-embryo
#15
Jason S Watts, Diane G Morton, Kenneth J Kemphues, Jennifer L Watts
Biotin is an essential cofactor for multiple metabolic reactions catalyzed by carboxylases. Biotin is covalently linked to apoproteins by holocarboxylase synthetase (HCS). Accordingly, some mutations in HCS cause holocarboxylase deficiency, a rare metabolic disorder that can be life threatening if left untreated. However, the long-term effects of HCS deficiency are poorly understood. Here, we report our investigations of bpl-1, which encodes the C. elegans ortholog of HCS. We found that mutations in the biotin-binding region of bpl-1 are maternal-effect lethal, and cause defects in embryonic polarity establishment, meiosis, and the integrity of the eggshell permeability barrier...
November 20, 2017: Journal of Biological Chemistry
https://www.readbyqxmd.com/read/29157822/antibiofilm-activities-of-norharmane-and-its-derivatives-against-escherichia-coli-o157-h7-and-other-bacteria
#16
Jin-Hyung Lee, Yong-Guy Kim, Sang Hee Shim, Jintae Lee
BACKGROUND: Bacterial biofilms exhibit reduced sensitivity to conventional antibiotics and host defence systems and contribute to the persistence of chronic bacterial infections. HYPOTHESIS: The antibiofilm approach using plant alkaloids provides an alternative to antibiotic strategies. STUDY DESIGN: In this study, the antibiofilm activities of various plant alkaloids were investigated against enterohemorrhagic Escherichia coli O157:H7 and Pseudomonas aeruginosa...
December 1, 2017: Phytomedicine: International Journal of Phytotherapy and Phytopharmacology
https://www.readbyqxmd.com/read/29157804/anti-parkinsonian-effects-of-%C3%AE-amyrin-are-regulated-via-lgg-1-involved-autophagy-pathway-in-caenorhabditis-elegans
#17
Chia-Cheng Wei, Chun-Han Chang, Vivian Hsiu-Chuan Liao
BACKGROUND: Parkinson's disease (PD) is a neurodegenerative disease that is associated with aging and is characterized as a movement disorder. Currently, there is still no complete therapy for PD. In recent years, the identification and characterization of medicinal plants to cure or treat PD has gained increasing scientific interest. PURPOSE: In this study, we investigated a pentacyclic triterpenoid compound, β-amyrin, which is found in many medicinal plants for its anti-Parkinsonian effects, using Caenorhabditis elegans (C...
December 1, 2017: Phytomedicine: International Journal of Phytotherapy and Phytopharmacology
https://www.readbyqxmd.com/read/29155814/optimal-synaptic-signaling-connectome-for-locomotory-behavior-in-caenorhabditis-elegans-design-minimizing-energy-cost
#18
Franciszek Rakowski, Jan Karbowski
The detailed knowledge of C. elegans connectome for 3 decades has not contributed dramatically to our understanding of worm's behavior. One of main reasons for this situation has been the lack of data on the type of synaptic signaling between particular neurons in the worm's connectome. The aim of this study was to determine synaptic polarities for each connection in a small pre-motor circuit controlling locomotion. Even in this compact network of just 7 neurons the space of all possible patterns of connection types (excitation vs...
November 20, 2017: PLoS Computational Biology
https://www.readbyqxmd.com/read/29155749/immobilization-of-caenorhabditis-elegans-to-analyze-intracellular-transport-in-neurons
#19
Shinsuke Niwa
Axonal transport and intraflagellar transport (IFT) are essential for axon and cilia morphogenesis and function. Kinesin superfamily proteins and dynein are molecular motors that regulate anterograde and retrograde transport, respectively. These motors use microtubule networks as rails. Caenorhabditis elegans (C. elegans) is a powerful model organism to study axonal transport and IFT in vivo. Here, I describe a protocol to observe axonal transport and IFT in living C. elegans. Transported cargo can be visualized by tagging cargo proteins using fluorescent proteins such as green fluorescent protein (GFP)...
October 18, 2017: Journal of Visualized Experiments: JoVE
https://www.readbyqxmd.com/read/29155731/the-nematode-caenorhabditis-elegans-a-versatile-in-vivo-model-to-study-host-microbe-interactions
#20
Luca Issi, Meredith Rioux, Reeta Rao
We demonstrate a method using Caenorhabditis elegans as a model host to study microbial interaction. Microbes are introduced via the diet making the intestine the primary location for disease. The nematode intestine structurally and functionally mimics mammalian intestines and is transparent making it amenable to microscopic study of colonization. Here we show that pathogens can cause disease and death. We are able to identify microbial mutants that show altered virulence. Its conserved innate response to biotic stresses makes C...
October 18, 2017: Journal of Visualized Experiments: JoVE
keyword
keyword
74075
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"