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Rob Knight

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https://www.readbyqxmd.com/read/28195358/parkinson-s-disease-and-parkinson-s-disease-medications-have-distinct-signatures-of-the-gut-microbiome
#1
Erin M Hill-Burns, Justine W Debelius, James T Morton, William T Wissemann, Matthew R Lewis, Zachary D Wallen, Shyamal D Peddada, Stewart A Factor, Eric Molho, Cyrus P Zabetian, Rob Knight, Haydeh Payami
BACKGROUND: There is mounting evidence for a connection between the gut and Parkinson's disease (PD). Dysbiosis of gut microbiota could explain several features of PD. OBJECTIVE: The objective of this study was to determine if PD involves dysbiosis of gut microbiome, disentangle effects of confounders, and identify candidate taxa and functional pathways to guide research. METHODS: A total of 197 PD cases and 130 controls were studied. Microbial composition was determined by 16S rRNA gene sequencing of DNA extracted from stool...
February 14, 2017: Movement Disorders: Official Journal of the Movement Disorder Society
https://www.readbyqxmd.com/read/28193877/origin-of-microbial-biomineralization-and-magnetotaxis-during-the-archean
#2
Wei Lin, Greig A Paterson, Qiyun Zhu, Yinzhao Wang, Evguenia Kopylova, Ying Li, Rob Knight, Dennis A Bazylinski, Rixiang Zhu, Joseph L Kirschvink, Yongxin Pan
Microbes that synthesize minerals, a process known as microbial biomineralization, contributed substantially to the evolution of current planetary environments through numerous important geochemical processes. Despite its geological significance, the origin and evolution of microbial biomineralization remain poorly understood. Through combined metagenomic and phylogenetic analyses of deep-branching magnetotactic bacteria from the Nitrospirae phylum, and using a Bayesian molecular clock-dating method, we show here that the gene cluster responsible for biomineralization of magnetosomes, and the arrangement of magnetosome chain(s) within cells, both originated before or near the Archean divergence between the Nitrospirae and Proteobacteria This phylogenetic divergence occurred well before the Great Oxygenation Event...
February 13, 2017: Proceedings of the National Academy of Sciences of the United States of America
https://www.readbyqxmd.com/read/28191884/dynamics-of-the-human-gut-microbiome-in-inflammatory-bowel-disease
#3
Jonas Halfvarson, Colin J Brislawn, Regina Lamendella, Yoshiki Vázquez-Baeza, William A Walters, Lisa M Bramer, Mauro D'Amato, Ferdinando Bonfiglio, Daniel McDonald, Antonio Gonzalez, Erin E McClure, Mitchell F Dunklebarger, Rob Knight, Janet K Jansson
Inflammatory bowel disease (IBD) is characterized by flares of inflammation with a periodic need for increased medication and sometimes even surgery. The aetiology of IBD is partly attributed to a deregulated immune response to gut microbiome dysbiosis. Cross-sectional studies have revealed microbial signatures for different IBD subtypes, including ulcerative colitis, colonic Crohn's disease and ileal Crohn's disease. Although IBD is dynamic, microbiome studies have primarily focused on single time points or a few individuals...
February 13, 2017: Nature Microbiology
https://www.readbyqxmd.com/read/28152560/transcriptional-characterization-of-vibrio-fischeri-during-colonization-of-juvenile-euprymna-scolopes
#4
Luke R Thompson, Kiel Nikolakakis, Shu Pan, Jennifer Reed, Rob Knight, Edward G Ruby
The marine bacterium Vibrio fischeri is the monospecific symbiont of the Hawaiian bobtail squid, Euprymna scolopes, and the establishment of this association involves a number of signaling pathways and transcriptional responses between both partners. We report here the first full RNA-Seq dataset representing host-associated V. fischeri cells from colonized juvenile E. scolopes, as well as comparative transcriptomes under both laboratory and simulated marine planktonic conditions. These data elucidate the broad transcriptional changes that these bacteria undergo during the early stages of symbiotic colonization...
February 2, 2017: Environmental Microbiology
https://www.readbyqxmd.com/read/28144630/balance-trees-reveal-microbial-niche-differentiation
#5
James T Morton, Jon Sanders, Robert A Quinn, Daniel McDonald, Antonio Gonzalez, Yoshiki Vázquez-Baeza, Jose A Navas-Molina, Se Jin Song, Jessica L Metcalf, Embriette R Hyde, Manuel Lladser, Pieter C Dorrestein, Rob Knight
Advances in sequencing technologies have enabled novel insights into microbial niche differentiation, from analyzing environmental samples to understanding human diseases and informing dietary studies. However, identifying the microbial taxa that differentiate these samples can be challenging. These issues stem from the compositional nature of 16S rRNA gene data (or, more generally, taxon or functional gene data); the changes in the relative abundance of one taxon influence the apparent abundances of the others...
January 2017: MSystems
https://www.readbyqxmd.com/read/28124727/patterns-in-gut-microbiota-similarity-associated-with-degree-of-sociality-among-sex-classes-of-a-neotropical-primate
#6
Katherine R Amato, Sarie Van Belle, Anthony Di Fiore, Alejandro Estrada, Rebecca Stumpf, Bryan White, Karen E Nelson, Rob Knight, Steven R Leigh
Studies of human and domestic animal models indicate that related individuals and those that spend the most time in physical contact typically have more similar gut microbial communities. However, few studies have examined these factors in wild mammals where complex social dynamics and a variety of interacting environmental factors may impact the patterns observed in controlled systems. Here, we explore the effect of host kinship and time spent in social contact on the gut microbiota of wild, black howler monkeys (Alouatta pigra)...
January 26, 2017: Microbial Ecology
https://www.readbyqxmd.com/read/28081445/bringing-the-dynamic-microbiome-to-life-with-animations
#7
Yoshiki Vázquez-Baeza, Antonio Gonzalez, Larry Smarr, Daniel McDonald, James T Morton, Jose A Navas-Molina, Rob Knight
Our bodies and natural environment contain complex microbial communities, colloquially termed microbiomes. We previously created a web-based application, EMPeror, for visualizing ordinations derived from comparisons of these microbiome communities. We have now improved EMPeror to create interactive animations that connect successive samples to highlight patterns over time.
January 11, 2017: Cell Host & Microbe
https://www.readbyqxmd.com/read/28070282/the-database-of-the-predicts-projecting-responses-of-ecological-diversity-in-changing-terrestrial-systems-project
#8
Lawrence N Hudson, Tim Newbold, Sara Contu, Samantha L L Hill, Igor Lysenko, Adriana De Palma, Helen R P Phillips, Tamera I Alhusseini, Felicity E Bedford, Dominic J Bennett, Hollie Booth, Victoria J Burton, Charlotte W T Chng, Argyrios Choimes, David L P Correia, Julie Day, Susy Echeverría-Londoño, Susan R Emerson, Di Gao, Morgan Garon, Michelle L K Harrison, Daniel J Ingram, Martin Jung, Victoria Kemp, Lucinda Kirkpatrick, Callum D Martin, Yuan Pan, Gwilym D Pask-Hale, Edwin L Pynegar, Alexandra N Robinson, Katia Sanchez-Ortiz, Rebecca A Senior, Benno I Simmons, Hannah J White, Hanbin Zhang, Job Aben, Stefan Abrahamczyk, Gilbert B Adum, Virginia Aguilar-Barquero, Marcelo A Aizen, Belén Albertos, E L Alcala, Maria Del Mar Alguacil, Audrey Alignier, Marc Ancrenaz, Alan N Andersen, Enrique Arbeláez-Cortés, Inge Armbrecht, Víctor Arroyo-Rodríguez, Tom Aumann, Jan C Axmacher, Badrul Azhar, Adrián B Azpiroz, Lander Baeten, Adama Bakayoko, András Báldi, John E Banks, Sharad K Baral, Jos Barlow, Barbara I P Barratt, Lurdes Barrico, Paola Bartolommei, Diane M Barton, Yves Basset, Péter Batáry, Adam J Bates, Bruno Baur, Erin M Bayne, Pedro Beja, Suzan Benedick, Åke Berg, Henry Bernard, Nicholas J Berry, Dinesh Bhatt, Jake E Bicknell, Jochen H Bihn, Robin J Blake, Kadiri S Bobo, Roberto Bóçon, Teun Boekhout, Katrin Böhning-Gaese, Kevin J Bonham, Paulo A V Borges, Sérgio H Borges, Céline Boutin, Jérémy Bouyer, Cibele Bragagnolo, Jodi S Brandt, Francis Q Brearley, Isabel Brito, Vicenç Bros, Jörg Brunet, Grzegorz Buczkowski, Christopher M Buddle, Rob Bugter, Erika Buscardo, Jörn Buse, Jimmy Cabra-García, Nilton C Cáceres, Nicolette L Cagle, María Calviño-Cancela, Sydney A Cameron, Eliana M Cancello, Rut Caparrós, Pedro Cardoso, Dan Carpenter, Tiago F Carrijo, Anelena L Carvalho, Camila R Cassano, Helena Castro, Alejandro A Castro-Luna, Cerda B Rolando, Alexis Cerezo, Kim Alan Chapman, Matthieu Chauvat, Morten Christensen, Francis M Clarke, Daniel F R Cleary, Giorgio Colombo, Stuart P Connop, Michael D Craig, Leopoldo Cruz-López, Saul A Cunningham, Biagio D'Aniello, Neil D'Cruze, Pedro Giovâni da Silva, Martin Dallimer, Emmanuel Danquah, Ben Darvill, Jens Dauber, Adrian L V Davis, Jeff Dawson, Claudio de Sassi, Benoit de Thoisy, Olivier Deheuvels, Alain Dejean, Jean-Louis Devineau, Tim Diekötter, Jignasu V Dolia, Erwin Domínguez, Yamileth Dominguez-Haydar, Silvia Dorn, Isabel Draper, Niels Dreber, Bertrand Dumont, Simon G Dures, Mats Dynesius, Lars Edenius, Paul Eggleton, Felix Eigenbrod, Zoltán Elek, Martin H Entling, Karen J Esler, Ricardo F de Lima, Aisyah Faruk, Nina Farwig, Tom M Fayle, Antonio Felicioli, Annika M Felton, Roderick J Fensham, Ignacio C Fernandez, Catarina C Ferreira, Gentile F Ficetola, Cristina Fiera, Bruno K C Filgueiras, Hüseyin K Fırıncıoğlu, David Flaspohler, Andreas Floren, Steven J Fonte, Anne Fournier, Robert E Fowler, Markus Franzén, Lauchlan H Fraser, Gabriella M Fredriksson, Geraldo B Freire, Tiago L M Frizzo, Daisuke Fukuda, Dario Furlani, René Gaigher, Jörg U Ganzhorn, Karla P García, Juan C Garcia-R, Jenni G Garden, Ricardo Garilleti, Bao-Ming Ge, Benoit Gendreau-Berthiaume, Philippa J Gerard, Carla Gheler-Costa, Benjamin Gilbert, Paolo Giordani, Simonetta Giordano, Carly Golodets, Laurens G L Gomes, Rachelle K Gould, Dave Goulson, Aaron D Gove, Laurent Granjon, Ingo Grass, Claudia L Gray, James Grogan, Weibin Gu, Moisès Guardiola, Nihara R Gunawardene, Alvaro G Gutierrez, Doris L Gutiérrez-Lamus, Daniela H Haarmeyer, Mick E Hanley, Thor Hanson, Nor R Hashim, Shombe N Hassan, Richard G Hatfield, Joseph E Hawes, Matt W Hayward, Christian Hébert, Alvin J Helden, John-André Henden, Philipp Henschel, Lionel Hernández, James P Herrera, Farina Herrmann, Felix Herzog, Diego Higuera-Diaz, Branko Hilje, Hubert Höfer, Anke Hoffmann, Finbarr G Horgan, Elisabeth Hornung, Roland Horváth, Kristoffer Hylander, Paola Isaacs-Cubides, Hiroaki Ishida, Masahiro Ishitani, Carmen T Jacobs, Víctor J Jaramillo, Birgit Jauker, F Jiménez Hernández, McKenzie F Johnson, Virat Jolli, Mats Jonsell, S Nur Juliani, Thomas S Jung, Vena Kapoor, Heike Kappes, Vassiliki Kati, Eric Katovai, Klaus Kellner, Michael Kessler, Kathryn R Kirby, Andrew M Kittle, Mairi E Knight, Eva Knop, Florian Kohler, Matti Koivula, Annette Kolb, Mouhamadou Kone, Ádám Kőrösi, Jochen Krauss, Ajith Kumar, Raman Kumar, David J Kurz, Alex S Kutt, Thibault Lachat, Victoria Lantschner, Francisco Lara, Jesse R Lasky, Steven C Latta, William F Laurance, Patrick Lavelle, Violette Le Féon, Gretchen LeBuhn, Jean-Philippe Légaré, Valérie Lehouck, María V Lencinas, Pia E Lentini, Susan G Letcher, Qi Li, Simon A Litchwark, Nick A Littlewood, Yunhui Liu, Nancy Lo-Man-Hung, Carlos A López-Quintero, Mounir Louhaichi, Gabor L Lövei, Manuel Esteban Lucas-Borja, Victor H Luja, Matthew S Luskin, M Cristina MacSwiney G, Kaoru Maeto, Tibor Magura, Neil Aldrin Mallari, Louise A Malone, Patrick K Malonza, Jagoba Malumbres-Olarte, Salvador Mandujano, Inger E Måren, Erika Marin-Spiotta, Charles J Marsh, E J P Marshall, Eliana Martínez, Guillermo Martínez Pastur, David Moreno Mateos, Margaret M Mayfield, Vicente Mazimpaka, Jennifer L McCarthy, Kyle P McCarthy, Quinn S McFrederick, Sean McNamara, Nagore G Medina, Rafael Medina, Jose L Mena, Estefania Mico, Grzegorz Mikusinski, Jeffrey C Milder, James R Miller, Daniel R Miranda-Esquivel, Melinda L Moir, Carolina L Morales, Mary N Muchane, Muchai Muchane, Sonja Mudri-Stojnic, A Nur Munira, Antonio Muoñz-Alonso, B F Munyekenye, Robin Naidoo, A Naithani, Michiko Nakagawa, Akihiro Nakamura, Yoshihiro Nakashima, Shoji Naoe, Guiomar Nates-Parra, Dario A Navarrete Gutierrez, Luis Navarro-Iriarte, Paul K Ndang'ang'a, Eike L Neuschulz, Jacqueline T Ngai, Violaine Nicolas, Sven G Nilsson, Norbertas Noreika, Olivia Norfolk, Jorge Ari Noriega, David A Norton, Nicole M Nöske, A Justin Nowakowski, Catherine Numa, Niall O'Dea, Patrick J O'Farrell, William Oduro, Sabine Oertli, Caleb Ofori-Boateng, Christopher Omamoke Oke, Vicencio Oostra, Lynne M Osgathorpe, Samuel Eduardo Otavo, Navendu V Page, Juan Paritsis, Alejandro Parra-H, Luke Parry, Guy Pe'er, Peter B Pearman, Nicolás Pelegrin, Raphaël Pélissier, Carlos A Peres, Pablo L Peri, Anna S Persson, Theodora Petanidou, Marcell K Peters, Rohan S Pethiyagoda, Ben Phalan, T Keith Philips, Finn C Pillsbury, Jimmy Pincheira-Ulbrich, Eduardo Pineda, Joan Pino, Jaime Pizarro-Araya, A J Plumptre, Santiago L Poggio, Natalia Politi, Pere Pons, Katja Poveda, Eileen F Power, Steven J Presley, Vânia Proença, Marino Quaranta, Carolina Quintero, Romina Rader, B R Ramesh, Martha P Ramirez-Pinilla, Jai Ranganathan, Claus Rasmussen, Nicola A Redpath-Downing, J Leighton Reid, Yana T Reis, José M Rey Benayas, Juan Carlos Rey-Velasco, Chevonne Reynolds, Danilo Bandini Ribeiro, Miriam H Richards, Barbara A Richardson, Michael J Richardson, Rodrigo Macip Ríos, Richard Robinson, Carolina A Robles, Jörg Römbke, Luz Piedad Romero-Duque, Matthias Rös, Loreta Rosselli, Stephen J Rossiter, Dana S Roth, T'ai H Roulston, Laurent Rousseau, André V Rubio, Jean-Claude Ruel, Jonathan P Sadler, Szabolcs Sáfián, Romeo A Saldaña-Vázquez, Katerina Sam, Ulrika Samnegård, Joana Santana, Xavier Santos, Jade Savage, Nancy A Schellhorn, Menno Schilthuizen, Ute Schmiedel, Christine B Schmitt, Nicole L Schon, Christof Schüepp, Katharina Schumann, Oliver Schweiger, Dawn M Scott, Kenneth A Scott, Jodi L Sedlock, Steven S Seefeldt, Ghazala Shahabuddin, Graeme Shannon, Douglas Sheil, Frederick H Sheldon, Eyal Shochat, Stefan J Siebert, Fernando A B Silva, Javier A Simonetti, Eleanor M Slade, Jo Smith, Allan H Smith-Pardo, Navjot S Sodhi, Eduardo J Somarriba, Ramón A Sosa, Grimaldo Soto Quiroga, Martin-Hugues St-Laurent, Brian M Starzomski, Constanti Stefanescu, Ingolf Steffan-Dewenter, Philip C Stouffer, Jane C Stout, Ayron M Strauch, Matthew J Struebig, Zhimin Su, Marcela Suarez-Rubio, Shinji Sugiura, Keith S Summerville, Yik-Hei Sung, Hari Sutrisno, Jens-Christian Svenning, Tiit Teder, Caragh G Threlfall, Anu Tiitsaar, Jacqui H Todd, Rebecca K Tonietto, Ignasi Torre, Béla Tóthmérész, Teja Tscharntke, Edgar C Turner, Jason M Tylianakis, Marcio Uehara-Prado, Nicolas Urbina-Cardona, Denis Vallan, Adam J Vanbergen, Heraldo L Vasconcelos, Kiril Vassilev, Hans A F Verboven, Maria João Verdasca, José R Verdú, Carlos H Vergara, Pablo M Vergara, Jort Verhulst, Massimiliano Virgilio, Lien Van Vu, Edward M Waite, Tony R Walker, Hua-Feng Wang, Yanping Wang, James I Watling, Britta Weller, Konstans Wells, Catrin Westphal, Edward D Wiafe, Christopher D Williams, Michael R Willig, John C Z Woinarski, Jan H D Wolf, Volkmar Wolters, Ben A Woodcock, Jihua Wu, Joseph M Wunderle, Yuichi Yamaura, Satoko Yoshikura, Douglas W Yu, Andrey S Zaitsev, Juliane Zeidler, Fasheng Zou, Ben Collen, Rob M Ewers, Georgina M Mace, Drew W Purves, Jörn P W Scharlemann, Andy Purvis
The PREDICTS project-Projecting Responses of Ecological Diversity In Changing Terrestrial Systems (www.predicts.org.uk)-has collated from published studies a large, reasonably representative database of comparable samples of biodiversity from multiple sites that differ in the nature or intensity of human impacts relating to land use. We have used this evidence base to develop global and regional statistical models of how local biodiversity responds to these measures. We describe and make freely available this 2016 release of the database, containing more than 3...
January 2017: Ecology and Evolution
https://www.readbyqxmd.com/read/28011012/intestinal-adaptation-in-proximal-and-distal-segments-two-epithelial-responses-diverge-after-intestinal-separation
#9
Kathy A Schall, Kathleen A Holoyda, Mubina Isani, Christopher Schlieve, Tasha Salisbury, Thien Khuu, Justine W Debelius, Rex A Moats, Harvey A Pollack, Ching-Ling Lien, Kathryn Fowler, Xiaogang Hou, Rob Knight, Tracy C Grikscheit
BACKGROUND: In short bowel syndrome, luminal factors influence adaptation in which the truncated intestine increases villus lengths and crypt depths to increase nutrient absorption. No study has evaluated the effect of adaptation within the distal intestine after intestinal separation. We evaluated multiple conditions, including Igf1r inhibition, in proximal and distal segments after intestinal resection to evaluate the epithelial effects of the absence of mechanoluminal stimulation. METHODS: Short bowel syndrome was created in adult male zebrafish by performing a proximal stoma with ligation of the distal intestine...
December 20, 2016: Surgery
https://www.readbyqxmd.com/read/27993177/diets-high-in-resistant-starch-increase-plasma-levels-of-trimethylamine-n-oxide-a-gut-microbiome-metabolite-associated-with-cvd-risk
#10
Nathalie Bergeron, Paul T Williams, Regina Lamendella, Nastaran Faghihnia, Alyssa Grube, Xinmin Li, Zeneng Wang, Rob Knight, Janet K Jansson, Stanley L Hazen, Ronald M Krauss
Production of trimethylamine-N-oxide (TMAO), a biomarker of CVD risk, is dependent on intestinal microbiota, but little is known of dietary conditions promoting changes in gut microbial communities. Resistant starches (RS) alter the human microbiota. We sought to determine whether diets varying in RS and carbohydrate (CHO) content affect plasma TMAO levels. We also assessed postprandial glucose and insulin responses and plasma lipid changes to diets high and low in RS. In a cross-over trial, fifty-two men and women consumed a 2-week baseline diet (41 percentage of energy (%E) CHO, 40 % fat, 19 % protein), followed by 2-week high- and low-RS diets separated by 2-week washouts...
December 2016: British Journal of Nutrition
https://www.readbyqxmd.com/read/27986704/comparison-of-collection-methods-for-fecal-samples-in-microbiome-studies
#11
Emily Vogtmann, Jun Chen, Amnon Amir, Jianxin Shi, Christian C Abnet, Heidi Nelson, Rob Knight, Nicholas Chia, Rashmi Sinha
Prospective cohort studies are needed to assess the relationship between the fecal microbiome and human health and disease. To evaluate fecal collection methods, we determined technical reproducibility, stability at ambient temperature, and accuracy of 5 fecal collection methods (no additive, 95% ethanol, RNAlater Stabilization Solution, fecal occult blood test cards, and fecal immunochemical test tubes). Fifty-two healthy volunteers provided fecal samples at the Mayo Clinic in Rochester, Minnesota, in 2014...
January 15, 2017: American Journal of Epidemiology
https://www.readbyqxmd.com/read/27940910/antibiotic-discovery-is-a-walk-in-the-park
#12
Louis-Félix Nothias, Rob Knight, Pieter C Dorrestein
No abstract text is available yet for this article.
December 20, 2016: Proceedings of the National Academy of Sciences of the United States of America
https://www.readbyqxmd.com/read/27912057/gut-microbiota-regulate-motor-deficits-and-neuroinflammation-in-a-model-of-parkinson-s-disease
#13
Timothy R Sampson, Justine W Debelius, Taren Thron, Stefan Janssen, Gauri G Shastri, Zehra Esra Ilhan, Collin Challis, Catherine E Schretter, Sandra Rocha, Viviana Gradinaru, Marie-Francoise Chesselet, Ali Keshavarzian, Kathleen M Shannon, Rosa Krajmalnik-Brown, Pernilla Wittung-Stafshede, Rob Knight, Sarkis K Mazmanian
The intestinal microbiota influence neurodevelopment, modulate behavior, and contribute to neurological disorders. However, a functional link between gut bacteria and neurodegenerative diseases remains unexplored. Synucleinopathies are characterized by aggregation of the protein α-synuclein (αSyn), often resulting in motor dysfunction as exemplified by Parkinson's disease (PD). Using mice that overexpress αSyn, we report herein that gut microbiota are required for motor deficits, microglia activation, and αSyn pathology...
December 1, 2016: Cell
https://www.readbyqxmd.com/read/27849584/lifestyle-chemistries-from-phones-for-individual-profiling
#14
Amina Bouslimani, Alexey V Melnik, Zhenjiang Xu, Amnon Amir, Ricardo R da Silva, Mingxun Wang, Nuno Bandeira, Theodore Alexandrov, Rob Knight, Pieter C Dorrestein
Imagine a scenario where personal belongings such as pens, keys, phones, or handbags are found at an investigative site. It is often valuable to the investigative team that is trying to trace back the belongings to an individual to understand their personal habits, even when DNA evidence is also available. Here, we develop an approach to translate chemistries recovered from personal objects such as phones into a lifestyle sketch of the owner, using mass spectrometry and informatics approaches. Our results show that phones' chemistries reflect a personalized lifestyle profile...
November 29, 2016: Proceedings of the National Academy of Sciences of the United States of America
https://www.readbyqxmd.com/read/27822557/migraines-are-correlated-with-higher-levels-of-nitrate-nitrite-and-nitric-oxide-reducing-oral-microbes-in-the-american-gut-project-cohort
#15
Antonio Gonzalez, Embriette Hyde, Naseer Sangwan, Jack A Gilbert, Erik Viirre, Rob Knight
Nitrates, such as cardiac therapeutics and food additives, are common headache triggers, with nitric oxide playing an important role. Facultative anaerobic bacteria in the oral cavity may contribute migraine-triggering levels of nitric oxide through the salivary nitrate-nitrite-nitric oxide pathway. Using high-throughput sequencing technologies, we detected observable and significantly higher abundances of nitrate, nitrite, and nitric oxide reductase genes in migraineurs versus nonmigraineurs in samples collected from the oral cavity and a slight but significant difference in fecal samples...
September 2016: MSystems
https://www.readbyqxmd.com/read/27822553/mockrobiota-a-public-resource-for-microbiome-bioinformatics-benchmarking
#16
Nicholas A Bokulich, Jai Ram Rideout, William G Mercurio, Arron Shiffer, Benjamin Wolfe, Corinne F Maurice, Rachel J Dutton, Peter J Turnbaugh, Rob Knight, J Gregory Caporaso
Mock communities are an important tool for validating, optimizing, and comparing bioinformatics methods for microbial community analysis. We present mockrobiota, a public resource for sharing, validating, and documenting mock community data resources, available at http://caporaso-lab.github.io/mockrobiota/. The materials contained in mockrobiota include data set and sample metadata, expected composition data (taxonomy or gene annotations or reference sequences for mock community members), and links to raw data (e...
September 2016: MSystems
https://www.readbyqxmd.com/read/27822543/the-oral-and-skin-microbiomes-of-captive-komodo-dragons-are-significantly-shared-with-their-habitat
#17
Embriette R Hyde, Jose A Navas-Molina, Se Jin Song, Jordan G Kueneman, Gail Ackermann, Cesar Cardona, Gregory Humphrey, Don Boyer, Tom Weaver, Joseph R Mendelson, Valerie J McKenzie, Jack A Gilbert, Rob Knight
Examining the way in which animals, including those in captivity, interact with their environment is extremely important for studying ecological processes and developing sophisticated animal husbandry. Here we use the Komodo dragon (Varanus komodoensis) to quantify the degree of sharing of salivary, skin, and fecal microbiota with their environment in captivity. Both species richness and microbial community composition of most surfaces in the Komodo dragon's environment are similar to the Komodo dragon's salivary and skin microbiota but less similar to the stool-associated microbiota...
July 2016: MSystems
https://www.readbyqxmd.com/read/27822526/preservation-methods-differ-in-fecal-microbiome-stability-affecting-suitability-for-field-studies
#18
Se Jin Song, Amnon Amir, Jessica L Metcalf, Katherine R Amato, Zhenjiang Zech Xu, Greg Humphrey, Rob Knight
Immediate freezing at -20°C or below has been considered the gold standard for microbiome preservation, yet this approach is not feasible for many field studies, ranging from anthropology to wildlife conservation. Here we tested five methods for preserving human and dog fecal specimens for periods of up to 8 weeks, including such types of variation as freeze-thaw cycles and the high temperature fluctuations often encountered under field conditions. We found that three of the methods-95% ethanol, FTA cards, and the OMNIgene Gut kit-can preserve samples sufficiently well at ambient temperatures such that differences at 8 weeks are comparable to differences among technical replicates...
May 2016: MSystems
https://www.readbyqxmd.com/read/27822524/from-sample-to-multi-omics-conclusions-in-under-48-hours
#19
Robert A Quinn, Jose A Navas-Molina, Embriette R Hyde, Se Jin Song, Yoshiki Vázquez-Baeza, Greg Humphrey, James Gaffney, Jeremiah J Minich, Alexey V Melnik, Jakob Herschend, Jeff DeReus, Austin Durant, Rachel J Dutton, Mahdieh Khosroheidari, Clifford Green, Ricardo da Silva, Pieter C Dorrestein, Rob Knight
Multi-omics methods have greatly advanced our understanding of the biological organism and its microbial associates. However, they are not routinely used in clinical or industrial applications, due to the length of time required to generate and analyze omics data. Here, we applied a novel integrated omics pipeline for the analysis of human and environmental samples in under 48 h. Human subjects that ferment their own foods provided swab samples from skin, feces, oral cavity, fermented foods, and household surfaces to assess the impact of home food fermentation on their microbial and chemical ecology...
March 2016: MSystems
https://www.readbyqxmd.com/read/27822521/geography-and-location-are-the-primary-drivers-of-office-microbiome-composition
#20
John Chase, Jennifer Fouquier, Mahnaz Zare, Derek L Sonderegger, Rob Knight, Scott T Kelley, Jeffrey Siegel, J Gregory Caporaso
In the United States, humans spend the majority of their time indoors, where they are exposed to the microbiome of the built environment (BE) they inhabit. Despite the ubiquity of microbes in BEs and their potential impacts on health and building materials, basic questions about the microbiology of these environments remain unanswered. We present a study on the impacts of geography, material type, human interaction, location in a room, seasonal variation, and indoor and microenvironmental parameters on bacterial communities in offices...
March 2016: MSystems
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