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https://www.readbyqxmd.com/read/28434130/characterization-of-extracellular-membrane-vesicles-of-an-antarctic-bacterium-shewanella-livingstonensis-ac10-and-their-enhanced-production-by-alteration-of-phospholipid-composition
#1
Fumiaki Yokoyama, Jun Kawamoto, Tomoya Imai, Tatsuo Kurihara
A cold-adapted bacterium, Shewanella livingstonensis Ac10, which produces eicosapentaenoic acid (EPA) as a component of its membrane phospholipids, is useful as a model to study the function of EPA and as a host for heterologous production of thermolabile proteins at low temperatures. In this study, we characterized extracellular membrane vesicles (EMVs) of this bacterium to examine the involvement of EPA in the biogenesis of EMVs and for the future application of EMVs to extracellular protein production. We found that this strain produced EMVs from the cell surface...
April 22, 2017: Extremophiles: Life Under Extreme Conditions
https://www.readbyqxmd.com/read/28433916/a-novel-method-for-contributing-to-composting-start-up-at-low-temperature-by-inoculating-cold-adapted-microbial-consortium
#2
Xin-Yu Xie, Yue Zhao, Qing-Hong Sun, Xue-Qin Wang, Hong-Yang Cui, Xu Zhang, Yan-Jie Li, Zi-Min Wei
Low temperature climate presented a technical challenge to start-up composting in northern region of China. This study investigated if the cold-adapted microbial consortium (CAMC) could promote composting start-up at low temperature. In this work, the CAMC was inoculated when food waste was composted at 10°C. The results showed that inoculating CAMC accelerated the piles temperature effectively, the piles passed through the start-up period within 37h. Moreover, the inoculants could enhance the abundances of dominant strains related to organic matters degradation rate...
April 11, 2017: Bioresource Technology
https://www.readbyqxmd.com/read/28429829/molecular-adaptation-in-the-world-s-deepest-living-animal-insights-from-transcriptome-sequencing-of-the-hadal-amphipod-hirondellea-gigas
#3
Yi Lan, Jin Sun, Renmao Tian, Douglas H Bartlett, Runsheng Li, Yue Him Wong, Weipeng Zhang, Jian-Wen Qiu, Ting Xu, Li-Sheng He, Harry G Tabata, Pei-Yuan Qian
The Challenger Deep in the Mariana Trench is the deepest point in the oceans of our planet. Understanding how animals adapt to this harsh environment characterized by high hydrostatic pressure, food-limited, dark, and cold is of great scientific interest. Of the animals dwelling in the Challenger Deep, amphipods have been captured using baited traps. In the present study, we sequenced the transcriptome of the amphipod Hirondellea gigas collected at a depth of 10,929 m from the East Pond of the Challenger Deep...
April 21, 2017: Molecular Ecology
https://www.readbyqxmd.com/read/28427344/genome-wide-identification-of-genes-probably-relevant-to-the-adaptation-of-schizothoracins-teleostei-cypriniformes-to-the-uplift-of-the-qinghai-tibet-plateau
#4
Wei Chi, Xufa Ma, Jiangong Niu, Ming Zou
BACKGROUND: Molecular adaptation to the severe environments present during the uplift of the Qinghai-Tibet Plateau has attracted the attention of researchers. The divergence of the three specialization groups of schizothoracins (Primitive, Specialized and Highly Specialized) may correspond to the three phases of plateau uplift. Based on the transcripts of representative species of the three specialized groups and an outgroup, genes in schizothoracins that may have played important roles during the adaptation to new environments were investigated...
April 20, 2017: BMC Genomics
https://www.readbyqxmd.com/read/28426818/alternative-glacial-interglacial-refugia-demographic-hypotheses-tested-on-cephalocereus-columna-trajani-cactaceae-in-the-intertropical-mexican-drylands
#5
Amelia Cornejo-Romero, Carlos Fabián Vargas-Mendoza, Gustavo F Aguilar-Martínez, Javier Medina-Sánchez, Beatriz Rendón-Aguilar, Pedro Luis Valverde, Jose Alejandro Zavala-Hurtado, Alejandra Serrato, Sombra Rivas-Arancibia, Marco Aurelio Pérez-Hernández, Gerardo López-Ortega, Cecilia Jiménez-Sierra
Historic demography changes of plant species adapted to New World arid environments could be consistent with either the Glacial Refugium Hypothesis (GRH), which posits that populations contracted to refuges during the cold-dry glacial and expanded in warm-humid interglacial periods, or with the Interglacial Refugium Hypothesis (IRH), which suggests that populations contracted during interglacials and expanded in glacial times. These contrasting hypotheses are developed in the present study for the giant columnar cactus Cephalocereus columna-trajani in the intertropical Mexican drylands where the effects of Late Quaternary climatic changes on phylogeography of cacti remain largely unknown...
2017: PloS One
https://www.readbyqxmd.com/read/28419257/rodent-pika-parasite-spillover-in-western-north-america
#6
Patrick Foley, Tara Roth, Janet Foley, Chris Ray
Competition during the Cenozoic expansion of the Rodentia may have contributed to ecological niche reduction of pikas, which are now increasingly under threat as their habitat degrades under global climate change, while some rodents expand their ranges and overlap with pikas. Range overlap carries the possibility of disease spillover. Contemporary North American pikas are cold-adapted and relegated primarily to alpine environments where they subsist on relatively low-quality herbaceous diet. Yet their evolutionary ancestors were distributed geographically even into the subtropics...
April 15, 2017: Journal of Medical Entomology
https://www.readbyqxmd.com/read/28416257/nrf2-and-regulation-of-the-antioxidant-system-in-the-antarctic-silverfish-pleuragramma-antarctica-adaptation-to-environmental-changes-of-pro-oxidant-pressure
#7
Maria Elisa Giuliani, Maura Benedetti, Marco Nigro, Francesco Regoli
Despite the key importance of Nrf2-Keap1 in regulating antioxidant system in vertebrates, this system is still poorly investigated in marine species. The present study focused on the Antarctic silverfish Pleuragramma antarctica which, during the final phases of embryo development in platelet ice, is challenged by a sudden enhancement of environmental oxidative conditions associated to ice melting. Partial coding sequences were identified for Nrf2, its repressor Keap1 and for typical Nrf2-target antioxidant genes, like catalase, glutathione peroxidase isoform 1 and Cu/Zn-dependent superoxide dismutase...
April 7, 2017: Marine Environmental Research
https://www.readbyqxmd.com/read/28414329/alternatively-activated-macrophages-do-not-synthesize-catecholamines-or-contribute-to-adipose-tissue-adaptive-thermogenesis
#8
Katrin Fischer, Henry H Ruiz, Kevin Jhun, Brian Finan, Douglas J Oberlin, Verena van der Heide, Anastasia V Kalinovich, Natasa Petrovic, Yochai Wolf, Christoffer Clemmensen, Andrew C Shin, Senad Divanovic, Frank Brombacher, Elke Glasmacher, Susanne Keipert, Martin Jastroch, Joachim Nagler, Karl-Werner Schramm, Dasa Medrikova, Gustav Collden, Stephen C Woods, Stephan Herzig, Dirk Homann, Steffen Jung, Jan Nedergaard, Barbara Cannon, Matthias H Tschöp, Timo D Müller, Christoph Buettner
Adaptive thermogenesis is the process of heat generation in response to cold stimulation. It is under the control of the sympathetic nervous system, whose chief effector is the catecholamine norepinephrine (NE). NE enhances thermogenesis through β3-adrenergic receptors to activate brown adipose tissue and by 'browning' white adipose tissue. Recent studies have reported that alternative activation of macrophages in response to interleukin (IL)-4 stimulation induces the expression of tyrosine hydroxylase (TH), a key enzyme in the catecholamine synthesis pathway, and that this activation provides an alternative source of locally produced catecholamines during the thermogenic process...
April 17, 2017: Nature Medicine
https://www.readbyqxmd.com/read/28414264/the-rice-transcription-factors-osice-confer-enhanced-cold-tolerance-in-transgenic-arabidopsis
#9
Cuiyun Deng, Haiyan Ye, Meng Fan, Tongliang Pu, Jianbin Yan
Cold stress is one of the major constraints for crop yield. Plants have in turn evolved highly sophisticated mechanisms involving altered physiological and biochemical processes to cope with the cold stress. Previous studies have revealed that the INDUCER OF CBF EXPRESSION 1 (ICE1), a basic helix-loop-helix (bHLH) transcription factor, directly binds and activates the expression of C-Repeat Binding Factor/Dehydration-Responsive-Element-Binding protein (CBF/DREB1) to regulate the cold-response pathway in Arabidopsis thaliana...
April 17, 2017: Plant Signaling & Behavior
https://www.readbyqxmd.com/read/28414068/modulation-of-anthraquinones-and-phloroglucinols-biosynthesis-in-hypericum-spp-by-cryogenic-treatment
#10
Katarína Bruňáková, Eva Čellárová
Beside the high post-cryogenic recovery rate, a reinstated scale of secondary metabolites in recovered plant tissues represents another inevitable aspect of an effective cryopreservation protocol for medicinal plants. The current study was aimed at evaluation of the elicitation potential of cryogenic treatment on secondary metabolism of some Hypericum species. In agreement with our assumption, the cold stimuli applied during the pre-cryogenic phase increased the tolerance to low temperatures (-196°C) in H...
April 13, 2017: Journal of Biotechnology
https://www.readbyqxmd.com/read/28412546/prefoldins-negatively-regulate-cold-acclimation-in-arabidopsis-thaliana-by-promoting-nuclear-proteasome-mediated-hy5-degradation
#11
Carlos Perea-Resa, Miguel A Rodríguez-Milla, Elisa Iniesto, Vicente Rubio, Julio Salinas
The process of cold acclimation is an important adaptive response whereby many plants from temperate regions increase their freezing tolerance after being exposed to low-nonfreezing temperatures. The correct development of this response relies on the precise accumulation of a number of transcription factors that regulate the appropriate patterns of cold-responsive gene expression. Multiple studies have revealed a variety of molecular mechanisms involved in promoting the accumulation of these transcription factors...
April 12, 2017: Molecular Plant
https://www.readbyqxmd.com/read/28409088/city-scale-climate-change-policies-do-they-matter-for-wellbeing
#12
Rosemary Hiscock, Arja Asikainen, Jouni Tuomisto, Matti Jantunen, Erkki Pärjälä, Clive E Sabel
Climate change mitigation policies aim to reduce climate change through reducing greenhouse gas (GHG) emissions whereas adaption policies seek to enable humans to live in a world with increasingly variable and more extreme climatic conditions. It is increasingly realised that enacting such policies will have unintended implications for public health, but there has been less focus on their implications for wellbeing. Wellbeing can be defined as a positive mental state which is influenced by living conditions...
June 2017: Preventive Medicine Reports
https://www.readbyqxmd.com/read/28408669/draft-genome-sequence-of-permafrost-bacterium-nesterenkonia-sp-strain-pf2b19-revealing-a-cold-adaptation-strategy-and-diverse-biotechnological-potential
#13
Purnima Singh, Neelam Kapse, Utpal Roy, Shiv Mohan Singh, P K Dhakephalkar
Nesterenkonia sp. strain PF2B19, a psychrophilic bacterium, was isolated from 44,800-year-old permafrost. The draft genome sequence of this strain revealed the presence of genes involved in the production of cold active enzymes, carotenoid biosynthesis, fatty acid biosynthesis, and resistance to heavy metals. These results show the immense potential of the strain.
April 13, 2017: Genome Announcements
https://www.readbyqxmd.com/read/28407107/phylogeography-of-sophora-moorcroftiana-supports-wu-s-hypothesis-on-the-origin-of-tibetan-alpine-flora
#14
Shanmei Cheng, Qiong La, Fan Lu, Takahiro Yonezawa, Ganqiang Yin, Zhiping Song, Yuguo Wang, Ji Yang, Wenju Zhang
Wu hypothesized that the Tibetan flora originated mostly from the paleotropical Tertiary flora in the Hengduan Mountains by adapting to the cold and arid environments associated with the strong uplift of the Qinghai-Tibet Plateau (QTP). Here, we combine the phylogeographic history of Sophora moorcroftiana with that of S. davidii to explore the speciation of S. moorcroftiana to test this hypothesis. We collected 151 individuals from 17 populations and sequenced two chloroplast fragments and the internal transcribed spacer of rDNA...
April 12, 2017: Journal of Heredity
https://www.readbyqxmd.com/read/28406161/ribosomal-background-of-the-bacillus-cereus-group-thermotypes
#15
Krzysztof Fiedoruk, Justyna M Drewnowska, Tamara Daniluk, Katarzyna Leszczynska, Piotr Iwaniuk, Izabela Swiecicka
In this study we reconstructed the architecture of Bacillus cereus sensu lato population based on ribosomal proteins, and identified a link between the ribosomal proteins' variants and thermal groups (thermotypes) of the bacilli. The in silico phyloproteomic analysis of 55 ribosomal proteins (34 large and 21 small subunit r-proteins) of 421 strains, representing 14 well-established or plausible B. cereus sensu lato species, revealed several ribosomal clusters (r-clusters), which in general were well correlated with the strains' affiliation to phylogenetic/thermal groups I-VII...
April 13, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28404986/ecology-of-cold-environments-new-insights-of-bacterial-metabolic-adaptation-through-an-integrated-genomic-phenomic-approach
#16
Stefano Mocali, Carolina Chiellini, Arturo Fabiani, Silvia Decuzzi, Donatella de Pascale, Ermenegilda Parrilli, Maria Luisa Tutino, Elena Perrin, Emanuele Bosi, Marco Fondi, Angelina Lo Giudice, Renato Fani
Cold environments dominate Earth's biosphere, hosting complex microbial communities with the ability to thrive at low temperatures. However, the underlying molecular mechanisms and the metabolic pathways involved in bacterial cold-adaptation mechanisms are still not fully understood. Herein, we assessed the metabolic features of the Antarctic bacterium Pseudoalteromonas haloplanktis TAC125 (PhTAC125), a model organism for cold-adaptation, at both 4 °C and 15 °C, by integrating genomic and phenomic (high-throughput phenotyping) data and comparing the obtained results to the taxonomically related Antarctic bacterium Pseudoalteromonas sp...
April 12, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28399403/thada-regulates-the-organismal-balance-between-energy-storage-and-heat-production
#17
Alexandra Moraru, Gulcin Cakan-Akdogan, Katrin Strassburger, Matilda Males, Sandra Mueller, Markus Jabs, Michael Muelleder, Martin Frejno, Bart P Braeckman, Markus Ralser, Aurelio A Teleman
Human susceptibility to obesity is mainly genetic, yet the underlying evolutionary drivers causing variation from person to person are not clear. One theory rationalizes that populations that have adapted to warmer climates have reduced their metabolic rates, thereby increasing their propensity to store energy. We uncover here the function of a gene that supports this theory. THADA is one of the genes most strongly selected during evolution as humans settled in different climates. We report here that THADA knockout flies are obese, hyperphagic, have reduced energy production, and are sensitive to the cold...
April 10, 2017: Developmental Cell
https://www.readbyqxmd.com/read/28399393/thermogenesis-by-thada
#18
Nirmalya Chatterjee, Norbert Perrimon
THADA has been associated with cold adaptation and diabetes in humans, but the cellular and molecular basis of its function has been unknown. Moraru and colleagues (2017) report in this issue of Developmental Cell that it triggers thermogenesis by uncoupling ATP hydrolysis from calcium transport into the endoplasmic reticulum.
April 10, 2017: Developmental Cell
https://www.readbyqxmd.com/read/28396352/association-of-the-cold-shock-dead-box-rna-helicase-rhle-to-the-rna-degradosome-in-caulobacter-crescentus
#19
Angel A Aguirre, Alexandre M Vicente, Steven W Hardwick, Daniela M Alvelos, Ricardo R Mazzon, Ben F Luisi, Marilis V Marques
In diverse bacterial lineages, multi-enzyme assemblies have evolved that are central elements of RNA metabolism and RNA-mediated regulation. The aquatic, Gram-negative bacteria Caulobacter crescentus, which has been a model system for studying the bacterial cell cycle, has an RNA degradosome assembly that is formed by the endoribonuclease RNase E and includes the DEAD-box RNA helicase RhlB. Immunoprecipitations of extracts from cells expressing an epitope-tagged RNase E reveal that RhlE, another member of the DEAD-box helicase family, associates with the degradosome at temperatures below the optimum for growth...
April 10, 2017: Journal of Bacteriology
https://www.readbyqxmd.com/read/28396211/cold-tolerance-of-the-asian-tiger-mosquito-aedes-albopictus-and-its-response-to-epigenetic-alterations
#20
Aljoscha Kreß, Ann-Marie Oppold, Ulrich Kuch, Jörg Oehlmann, Ruth Müller
Phenotypic plasticity is considered as one of the key traits responsible for the establishment of populations of the invasive mosquito Aedes albopictus, an important vector of viral and parasitic pathogens. The successful spread of this species to higher altitudes and latitudes may be explained by its ability to rapidly induce a heritable low-temperature phenotype (cold hardiness in eggs). As a result of the low genetic diversity of founder populations, an epigenetic short-term mechanism has been suggested as the driver of this diversification...
April 7, 2017: Journal of Insect Physiology
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