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https://www.readbyqxmd.com/read/28732043/investigation-of-horizontal-gene-transfer-of-pathogenicity-islands-in-escherichia-coli-using-next-generation-sequencing
#1
Maxim Messerer, Wolfgang Fischer, Sören Schubert
Horizontal gene transfer (HGT) contributes to the evolution of bacteria. All extraintestinal pathogenic Escherichia coli (ExPEC) harbour pathogenicity islands (PAIs), however relatively little is known about the acquisition of these PAIs. Due to these islands, ExPEC have properties to colonize and invade its hosts efficiently. Even though these PAIs are known to be acquired by HGT, only very few PAIs do carry mobilization and transfer genes required for the transmission by HGT. In this study, we apply for the first time next-generation sequencing (NGS) and in silico analyses in combination with in vitro experiments to decipher the mechanisms of PAI acquisition in ExPEC...
2017: PloS One
https://www.readbyqxmd.com/read/28731681/the-first-n-borylated-emitters-displaying-highly-efficient-thermally-activated-delayed-fluorescence-and-high-performance-oleds
#2
Yi-Jyun Lien, Tzu-Chieh Lin, Chun-Chieh Yang, Yu-Cheng Chiang, Chih-Hao Chang, Shih-Hung Liu, Yi-Ting Chen, Gene-Hsiang Lee, Pi-Tai Chou, Chin-Wei Lu, Yun Chi
Despite the fast boom of thermally activated delayed fluorescence (TADF) emitters bearing borane-based acceptor, so far, none of TADF emitters with a direct B-N linkage between N-donor and boryl acceptor has been reported. The latter should simplify molecular architecture and hence facilitate the synthetic design and versatility. We report here the preparation and characterization of a new series of N-borylated compounds with functional acridine donor unit; namely: ACBM, PACBM and SACBM. Spectroscopic studies were performed to explore their photophysical properties that exhibited prominent solvatochromism and thermally activated delayed fluorescence...
July 21, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28731474/bacterial-transcriptome-remodeling-during-sequential-co-culture-with-a-marine-dinoflagellate-and-diatom
#3
Marine Landa, Andrew S Burns, Selena J Roth, Mary Ann Moran
In their role as primary producers, marine phytoplankton modulate heterotrophic bacterial activities through differences in the types and amounts of organic matter they release. This study investigates the transcriptional response of bacterium Ruegeria pomeroyi, a member of the Roseobacter clade known to affiliate with diverse phytoplankton groups in the ocean, during a shift in phytoplankton taxonomy. The bacterium was initially introduced into a culture of the dinoflagellate Alexandrium tamarense, and then experienced a change in phytoplankton community composition as the diatom Thalassiosira pseudonana gradually outcompeted the dinoflagellate...
July 21, 2017: ISME Journal
https://www.readbyqxmd.com/read/28731472/high-abundance-and-expression-of-transposases-in-bacteria-from-the-baltic-sea
#4
Theoden Vigil-Stenman, Karolina Ininbergs, Birgitta Bergman, Martin Ekman
Transposases are mobile genetic elements suggested to have an important role in bacterial genome plasticity and host adaptation but their transcriptional activity in natural bacterial communities is largely unexplored. Here we analyzed metagenomes and -transcriptomes of size fractionated (0.1-0.8, 0.8-3.0 and 3.0-200 μm) bacterial communities from the brackish Baltic Sea, and adjacent marine waters. The Baltic Sea transposase levels, up to 1.7% of bacterial genes and 2% of bacterial transcripts, were considerably higher than in marine waters and similar to levels reported for extreme environments...
July 21, 2017: ISME Journal
https://www.readbyqxmd.com/read/28730965/efficient-non-invasive-plasmid-dna-administration-into-tibialis-cranialis-muscle-of-little-mice
#5
C R Cecchi, E Higuti, E R Lima, D P Vieira, P L Squair, C N Peroni, P Bartolini
An alternative treatment for growth hormone deficiency based on hGH-DNA administration, followed by electro gene transfer, was investigated by injecting the plasmid into surgically exposed or non-exposed quadriceps or tibialis muscle of immunodeficient "little" mice. Previously optimized electrotransfer conditions were also improved via a new combination of high/low voltage pulses: after 3 days, serum hGH was determined. Both groups exhibited similar results: 5.0 ± 2.2 (SD) and 3.5 ± 0.9 ng hGH/ml (P>0...
July 21, 2017: Current Molecular Medicine
https://www.readbyqxmd.com/read/28729959/shot-gun-proteome-and-transcriptome-mapping-of-the-jujube-floral-organ-and-identification-of-a-pollen-specific-s-locus-f-box-gene
#6
Ruihong Chen, Guoliang Chen, Jian Huang
The flower is a plant reproductive organ that forms part of the fruit produced as the flowering season ends. While the number and identity of proteins expressed in a jujube (Ziziphus jujuba Mill.) flower is currently unknown, integrative proteomic and transcriptomic analyses provide a systematic strategy of characterizing the floral biology of plants. We conducted a shotgun proteomic analysis on jujube flowers by using a filter-aided sample preparation tryptic digestion, followed by liquid chromatography-tandem mass spectrometry (LC-MS/MS)...
2017: PeerJ
https://www.readbyqxmd.com/read/28729817/ssr-marker-variations-in-brassica-species-provide-insight-into-the-origin-and-evolution-of-brassica-amphidiploids
#7
Ajay Kumar Thakur, Kunwar Harendra Singh, Lal Singh, Joghee Nanjundan, Yasin Jeshima Khan, Dhiraj Singh
BACKGROUND: Oilseed Brassica represents an important group of oilseed crops with a long history of evolution and cultivation. To understand the origin and evolution of Brassica amphidiploids, simple sequence repeat (SSR) markers were used to unravel genetic variations in three diploids and three amphidiploid Brassica species of U's triangle along with Eruca sativa as an outlier. RESULTS: Of 124 Brassica-derived SSR loci assayed, 100% cross-transferability was obtained for B...
2018: Hereditas
https://www.readbyqxmd.com/read/28729685/nucleocytoplasmic-shuttling-of-histone-deacetylase-9-controls-activity-dependent-thalamocortical-axon-branching
#8
Ricardo Alchini, Haruka Sato, Naoyuki Matsumoto, Tomomi Shimogori, Noriyuki Sugo, Nobuhiko Yamamoto
During development, thalamocortical (TC) axons form branches in an activity-dependent fashion. Here we investigated how neuronal activity is converted to molecular signals, focusing on an epigenetic mechanism involving histone deacetylases (HDACs). Immunohistochemistry demonstrated that HDAC9 was translocated from the nucleus to the cytoplasm of thalamic cells during the first postnatal week in rats. In organotypic co-cultures of the thalamus and cortex, fluorescent protein-tagged HDAC9 also exhibited nuclueocytoplasmic translocation in thalamic cells during culturing, which was reversed by tetrodotoxin treatment...
July 20, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28729290/choroidal-%C3%AE-%C3%AE-t-cells-in-protection-against-retinal-pigment-epithelium-and-retinal-injury
#9
Zhenyang Zhao, Yuejin Liang, Yin Liu, Pei Xu, Miles J Flamme-Wiese, Deming Sun, Jiaren Sun, Robert F Mullins, Yan Chen, Jiyang Cai
γδ T cells located near the epithelial barrier are integral components of local inflammatory and innate immune responses. We have previously reported the presence of choroidal γδ T cells in a model of chronic degeneration of the retinal pigment epithelium (RPE). The goals of the current study were to further define the functions of choroidal γδ T cells and to explore the underlying mechanisms of their action. Our data demonstrate that choroidal γδ T cells are activated by RPE injury in response to NaIO3 treatment, and that they express genes that encode immunosuppressive cytokines, such as IL-4 and IL-10...
July 20, 2017: FASEB Journal: Official Publication of the Federation of American Societies for Experimental Biology
https://www.readbyqxmd.com/read/28728564/comparison-of-the-protein-coding-genomes-of-three-deep-sea-sulfur-oxidising-bacteria-candidatus-ruthia-magnifica-candidatus-vesicomyosocius-okutanii-and-thiomicrospira-crunogena
#10
Susan E McGill, Daniel Barker
OBJECTIVE: " Candidatus Ruthia magnifica", "Candidatus Vesicomyosocius okutanii" and Thiomicrospira crunogena are all sulfur-oxidising bacteria found in deep-sea vent environments. Recent research suggests that the two symbiotic organisms, "Candidatus R. magnifica" and "Candidatus V. okutanii", may share common ancestry with the autonomously living species T. crunogena. We used comparative genomics to examine the genome-wide protein-coding content of all three species to explore their similarities...
July 20, 2017: BMC Research Notes
https://www.readbyqxmd.com/read/28728099/endogenous-viruses-of-parasitic-wasps-variations-on-a-common-theme
#11
REVIEW
Jean-Michel Drezen, Matthieu Leobold, Annie Bézier, Elisabeth Huguet, Anne-Nathalie Volkoff, Elisabeth A Herniou
In a remarkable example of convergent evolution, several parasitic wasp lineages have independently captured and maintained complex DNA virus machineries, used to transfer virulence factors. Parasitic wasps, which develop inside the larvae of their insect hosts, may inject Polydnaviruses (PDVs) or Virus-Like particles (VLPs), derived from the recurrent endogenization of several large DNA viruses. PDVs evolved from the domestication in braconid and ichneumonid wasps of viruses from different families and function as gene transfer agents...
July 17, 2017: Current Opinion in Virology
https://www.readbyqxmd.com/read/28728058/high-prevalence-of-esbls-in-retail-chicken-meat-despite-reduced-use-of-antimicrobials-in-chicken-production-france
#12
Tiago Casella, Mara Correa Lelles Nogueira, Estelle Saras, Marisa Haenni, Jean-Yves Madec
Extended-spectrum cephalosporins (ESCs) are critically important antibiotics for humans and their use in animals poses a potential threat for public health. Chicken represents an increasing part of the human diet and has also been regarded as a source of ESC-resistant Enterobacteriaceae because of the worldwide off-label use of ceftiofur, a broad-spectrum cephalosporin. Thus, numerous studies pointed out chicken as a reservoir of ESBL/pAmpC genes, plasmids and/or clones at risk for humans. In France, late 2011, strong political pressure led to a drastic reduction of ceftiofur use and all other antibiotics in chicken production...
July 10, 2017: International Journal of Food Microbiology
https://www.readbyqxmd.com/read/28727895/how-to-become-a-killer-or-is-it-all-accidental-virulence-strategies-in-oral-streptococci
#13
Izabela Sitkiewicz
Streptococci are a diverse group of gram positive microorganisms sharing common virulence traits and similar strategies to escape the oral niche and establish an infection in other parts of the host organism. Invasive infection with oral streptococci is "a perfect storm" that requires the concerted action of multiple biotic and abiotic factors. Our understanding of streptococcal pathogenicity and infectivity should probably be less mechanistic and driven not only by the identification of novel virulence factors...
July 20, 2017: Molecular Oral Microbiology
https://www.readbyqxmd.com/read/28727799/atlantic-salmon-cardiac-primary-cultures-an-in-vitro-model-to-study-viral-host-pathogen-interactions-and-pathogenesis
#14
Patricia A Noguera, Bianka Grunow, Matthias Klinger, Katherine Lester, Bertrand Collet, Jorge Del-Pozo
Development of Salmon Cardiac Primary Cultures (SCPCs) from Atlantic salmon pre-hatch embryos and their application as in vitro model for cardiotropic viral infection research are described. Producing SCPCs requires plating of trypsin dissociated embryos with subsequent targeted harvest from 24h up to 3 weeks, of relevant tissues after visual identification. SCPCs are then transferred individually to chambered wells for culture in isolation, with incubation at 15-22°. SCPCs production efficiency was not influenced by embryo's origin (0...
2017: PloS One
https://www.readbyqxmd.com/read/28727725/redgem-systematic-reduction-and-analysis-of-genome-scale-metabolic-reconstructions-for-development-of-consistent-core-metabolic-models
#15
Meric Ataman, Daniel F Hernandez Gardiol, Georgios Fengos, Vassily Hatzimanikatis
Genome-scale metabolic reconstructions have proven to be valuable resources in enhancing our understanding of metabolic networks as they encapsulate all known metabolic capabilities of the organisms from genes to proteins to their functions. However the complexity of these large metabolic networks often hinders their utility in various practical applications. Although reduced models are commonly used for modeling and in integrating experimental data, they are often inconsistent across different studies and laboratories due to different criteria and detail, which can compromise transferability of the findings and also integration of experimental data from different groups...
July 2017: PLoS Computational Biology
https://www.readbyqxmd.com/read/28726637/microrna-101-attenuates-pulmonary-fibrosis-by-inhibiting-fibroblast-proliferation-and-activation
#16
Chaoqun Huang, Xiao Xiao, Ye Yang, Amarjit Mishra, Yurong Liang, Xiangming Zeng, Xiaoyun Yang, Dao Xu, Michael R Blackburn, Craig A Henke, Lin Liu
Aberrant proliferation and activation of lung fibroblasts contribute to the initiation and progression of idiopathic pulmonary fibrosis (IPF). However, the mechanisms responsible for the proliferation and activation of fibroblasts are not fully understood. The objective of the current study was to investigate the role of miR-101 in the proliferation and activation of lung fibroblasts. miR-101 expression was determined in lung tissues from patients with IPF and mice with bleomycin-induced pulmonary fibrosis...
July 18, 2017: Journal of Biological Chemistry
https://www.readbyqxmd.com/read/28726631/lipid-transfer-from-plants-to-arbuscular-mycorrhiza-fungi
#17
Andreas Keymer, Priya Pimprikar, Vera Wewer, Claudia Huber, Mathias Brands, Simone L Bucerius, Pierre-Marc Delaux, Verena Klingl, Edda von Röpenack-Lahaye, Trevor L Wang, Wolfgang Eisenreich, Peter Dörmann, Martin Parniske, Caroline Gutjahr
Arbuscular mycorrhiza (AM) symbioses contribute to global carbon cycles as plant hosts divert up to 20% of photosynthate to the obligate biotrophic fungi. Previous studies suggested carbohydrates as the only form of carbon transferred to the fungi. However, de novo fatty acid (FA) synthesis has not been observed in AM fungi in absence of the plant. In a forward genetic approach, we identified two Lotus japonicus mutants defective in AM-specific paralogs of lipid biosynthesis genes (KASI and GPAT6). These mutants perturb fungal development and accumulation of emblematic fungal 16:1ω5 FAs...
July 20, 2017: ELife
https://www.readbyqxmd.com/read/28726496/a-preclinical-study-in-rhesus-macaques-for-cystic-fibrosis-to-assess-gene-transfer-and-transduction-by-aav1-and-aav5-with-a-dual-luciferase-reporter-system
#18
William Guggino, Janet Benson, JeanClare Seagrave, Ziying Yan, John F Engelhardt, Guangping Gao, Thomas J Conlon, Liudmila Cebotaru
Cystic fibrosis (CF) is an autosomal recessive disease that is potentially treatable by gene therapy. Since the identification of the gene encoding CFTR, a number of preclinical and clinical trials have been conducted using the first generation of adeno-associated virus, AAV2. All these studies showed that AAV gene therapy for CF is safe, but clinical benefit was not clearly demonstrated. Thus, a new generation of AAV Vectors based on other serotypes is needed to move the field forward. Here we have tested two AAV serotypes (AAV1 and AAV5), using a dual-luciferase reporter system with firefly and Renilla luciferase genes packaged into AAV1 or AAV5, respectively...
July 20, 2017: Human Gene Therapy. Clinical Development
https://www.readbyqxmd.com/read/28726303/the-ecology-of-white-handed-and-pileated-gibbons-in-a-zone-of-overlap-and-hybridization-in-thailand
#19
Norberto Asensio, Juan Manuel José-Domínguez, Chalita Kongrit, Warren Y Brockelman
OBJECTIVES: The study of related species in contact zones can elucidate what factors mediate species coexistence and geographical distributions. We investigated niche overlap and group interactions of two gibbon species and their hybrids co-occurring in a zone of overlap and hybridization. METHODS: The location, composition and behavior of white-handed, pileated, and mixed-species gibbon groups were studied by following them during 31 consecutive months in a relatively large part of the contact zone...
August 2017: American Journal of Physical Anthropology
https://www.readbyqxmd.com/read/28725658/mesenchymal-stem-cells-overexpressing-interleukin-10-promote-neuroprotection-in-experimental-acute-ischemic-stroke
#20
Masataka Nakajima, Chikako Nito, Kota Sowa, Satoshi Suda, Yasuhiro Nishiyama, Aki Nakamura-Takahashi, Yuko Nitahara-Kasahara, Kiwamu Imagawa, Tohru Hirato, Masayuki Ueda, Kazumi Kimura, Takashi Okada
Interleukin (IL)-10 is a contributing factor to neuroprotection of mesenchymal stem cell (MSC) transplantation after ischemic stroke. Our aim was to increase therapeutic effects by combining MSCs and ex vivo IL-10 gene transfer with an adeno-associated virus (AAV) vector using a rat transient middle cerebral artery occlusion (MCAO) model. Sprague-Dawley rats underwent 90 min MCAO followed by intravenous administration of MSCs alone or IL-10 gene-transferred MSCs (MSC/IL-10) at 0 or 3 hr after ischemia reperfusion...
September 15, 2017: Molecular Therapy. Methods & Clinical Development
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