scholarly journals Temperature sensation in cold acclimation of nematode Caenorhabditis elegans is affected by environmental oxygen concentration

2020 ◽  
Vol 37 (2) ◽  
pp. 103-110
Author(s):  
Misaki OKAHATA ◽  
Akane OHTA ◽  
Atsushi KUHARA
Keyword(s):  
Caenorhabditis Elegans ◽  
Cold Acclimation ◽  
Oxygen Concentration ◽  
Temperature Sensation

scholarly journals Diverse Regulation of Temperature Sensation by Trimeric G-Protein Signaling in Caenorhabditis elegans

PLoS ONE ◽  
2016 ◽  
Vol 11 (10) ◽  
pp. e0165518 ◽  
Author(s):  
Tomoyo Ujisawa ◽  
Akane Ohta ◽  
Misato Uda-Yagi ◽  
Atsushi Kuhara
Keyword(s):  
Caenorhabditis Elegans ◽  
G Protein ◽  
G Protein Signaling ◽  
Protein Signaling ◽  
Temperature Sensation

scholarly journals Mechanoreceptor-mediated circuit regulates cold tolerance in Caenorhabditis elegans

2019 ◽  
Author(s):  
Natsune Takagaki ◽  
Akane Ohta ◽  
Kohei Ohnishi ◽  
Yohei Minakuchi ◽  
Atsushi Toyoda ◽  
...  
Keyword(s):  
Caenorhabditis Elegans ◽  
Sodium Channel ◽  
Cold Tolerance ◽  
Temperature Change ◽  
Neuronal Response ◽  
Ectopic Expression ◽  
Xanthine Dehydrogenase ◽  
C Elegans ◽  
Temperature Sensation ◽  
Animal Survival

AbstractC. elegans mechanoreceptors located in the ASG sensoryneuron have been found to sense temperature — a key trait for animal survival. Experimental loss of xanthine dehydrogenase (XDH-1) function in the AIN and AVJ interneurons resulted in reduced cold tolerance and atypical neuronal response to changes in temperature. These interneurons are synapse with upstream neurons such as the mechanoreceptor-expressing ASG. Ca2+ imaging revealed that ASG responsiveness to temperature change via mechanoreceptor DEG-1, a Degenerin/Epithelial Sodium Channel (DEG/ENaC), affects downstream AIN and AVJ circuits. Ectopic expression of DEG-1 in the ASE gustatory neuron resulted in acquisition of thermosensitivity, while electrophysiological analysis revealed that DEG-1 was involved in temperature sensation. Together, these results suggest that cold tolerance is regulated by mechanoreceptor-mediated circuit calculation.

scholarly journals The hypoxia-response pathway modulates RAS/MAPK–mediated cell fate decisions in Caenorhabditis elegans

2019 ◽  
Vol 2 (3) ◽  
pp. e201800255 ◽  
Author(s):  
Sabrina Maxeiner ◽  
Judith Grolleman ◽  
Tobias Schmid ◽  
Jan Kammenga ◽  
Alex Hajnal
Keyword(s):  
Caenorhabditis Elegans ◽  
Cell Fate ◽  
Oxygen Concentration ◽  
Mapk Pathway ◽  
Atmospheric Oxygen ◽  
Mapk Signaling ◽  
Nuclear Hormone Receptor ◽  
Induced Differentiation ◽  
Hypoxia Response ◽  
Cell Fate Decisions

Animals need to adjust many cellular functions to oxygen availability to adapt to changing environmental conditions. We have used the nematode Caenorhabditis elegans as a model to investigate how variations in oxygen concentrations affect cell fate specification during development. Here, we show that several processes controlled by the conserved RTK/RAS/MAPK pathway are sensitive to changes in the atmospheric oxygen concentration. In the vulval precursor cells (VPCs), the hypoxia-inducible factor HIF-1 activates the expression of the nuclear hormone receptor NHR-57 to counteract RAS/MAPK–induced differentiation. Furthermore, cross-talk between the NOTCH and hypoxia-response pathways modulates the capability of the VPCs to respond to RAS/MAPK signaling. Lateral NOTCH signaling positively regulates the prolyl hydroxylase EGL-9, which promotes HIF-1 degradation in uncommitted VPCs and permits RAS/MAPK–induced differentiation. By inducing DELTA family NOTCH ligands, RAS/MAPK signaling creates a positive feedback loop that represses HIF-1 and NHR-57 expression in the proximal VPCs and keeps them capable of differentiating. This regulatory network formed by the NOTCH, hypoxia, and RAS/MAPK pathways may allow the animals to adapt developmental processes to variations in oxygen concentration.

Review for "The connectome of the Caenorhabditis elegans pharynx"

2020 ◽  
Author(s):  
Sreekanth Chalasani
Keyword(s):  
Caenorhabditis Elegans

High-resolution transmission electron microscopic study of highly oxygen doped silicon layer

1989 ◽  
Vol 47 ◽  
pp. 692-693
Author(s):  
H. Takaoka ◽  
M. Tomita ◽  
T. Hayashi
Keyword(s):  
High Resolution ◽  
Oxygen Concentration ◽  
Silicon Layer ◽  
Detailed Structure ◽  
Electron Microscopic ◽  
Cross Sectional ◽  
Transmission Electron ◽  
Doped Silicon ◽  
Argon Ion

High resolution transmission electron microscopy (HRTEM) is the effective technique for characterization of detailed structure of semiconductor materials. Oxygen is one of the important impurities in semiconductors. Detailed structure of highly oxygen doped silicon has not clearly investigated yet. This report describes detailed structure of highly oxygen doped silicon observed by HRTEM. Both samples prepared by Molecular beam epitaxy (MBE) and ion implantation were observed to investigate effects of oxygen concentration and doping methods to the crystal structure.The observed oxygen doped samples were prepared by MBE method in oxygen environment on (111) substrates. Oxygen concentration was about 1021 atoms/cm3. Another sample was silicon of (100) orientation implanted with oxygen ions at an energy of 180 keV. Oxygen concentration of this sample was about 1020 atoms/cm3 Cross-sectional specimens of (011) orientation were prepared by argon ion thinning and were observed by TEM at an accelerating voltage of 400 kV.

The glycomes of Caenorhabditis elegans and other model organisms

2002 ◽  
Vol 69 ◽  
pp. 117-134 ◽  
Author(s):  
Stuart M. Haslam ◽  
David Gems ◽  
Howard R. Morris ◽  
Anne Dell
Keyword(s):  
Caenorhabditis Elegans ◽  
Current Knowledge ◽  
Structural Data ◽  
Model Organisms ◽  
Entire Genome ◽  
C Elegans ◽  
The Face ◽  
Area Of Concern ◽  
Nematode Worm

There is no doubt that the immense amount of information that is being generated by the initial sequencing and secondary interrogation of various genomes will change the face of glycobiological research. However, a major area of concern is that detailed structural knowledge of the ultimate products of genes that are identified as being involved in glycoconjugate biosynthesis is still limited. This is illustrated clearly by the nematode worm Caenorhabditis elegans, which was the first multicellular organism to have its entire genome sequenced. To date, only limited structural data on the glycosylated molecules of this organism have been reported. Our laboratory is addressing this problem by performing detailed MS structural characterization of the N-linked glycans of C. elegans; high-mannose structures dominate, with only minor amounts of complex-type structures. Novel, highly fucosylated truncated structures are also present which are difucosylated on the proximal N-acetylglucosamine of the chitobiose core as well as containing unusual Fucα1–2Gal1–2Man as peripheral structures. The implications of these results in terms of the identification of ligands for genomically predicted lectins and potential glycosyltransferases are discussed in this chapter. Current knowledge on the glycomes of other model organisms such as Dictyostelium discoideum, Saccharomyces cerevisiae and Drosophila melanogaster is also discussed briefly.

Marker Trait Association for Autumn Cold Acclimation and Growth Rhythm in Pinus sylvestris

2003 ◽  
Vol 18 (1) ◽  
pp. 29-38 ◽  
Author(s):  
Reza Yazdani ◽  
Jan-erik Nilsson ◽  
Christophe Plomion ◽  
Gaurov Mathur
Keyword(s):  
Pinus Sylvestris ◽  
Cold Acclimation ◽  
Growth Rhythm ◽  
Trait Association

Caenorhabditis elegans

AccessScience ◽  
2015 ◽  
Keyword(s):  
Caenorhabditis Elegans

A Relationship Between Thermotolerance and Longevity in Caenorhabditis elegans

1998 ◽  
Vol 3 (1) ◽  
pp. 6-10 ◽  
Author(s):  
Glenda A Walker ◽  
David W Walker ◽  
Gordon J Lithgow
Keyword(s):  
Caenorhabditis Elegans
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