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https://www.readbyqxmd.com/read/28545131/major-changes-in-microbial-diversity-and-community-composition-across-gut-sections-of-a-juvenile-panchlora-cockroach
#1
Erin A Gontang, Frank O Aylward, Camila Carlos, Tijana Glavina Del Rio, Mansi Chovatia, Alison Fern, Chien-Chi Lo, Stephanie A Malfatti, Susannah G Tringe, Cameron R Currie, Roberto Kolter
Investigations of gut microbiomes have shed light on the diversity and genetic content of these communities, and helped shape our understanding of how host-associated microorganisms influence host physiology, behavior, and health. Despite the importance of gut microbes to metazoans, our understanding of the changes in diversity and composition across the alimentary tract, and the source of the resident community are limited. Here, using community metagenomics and 16S rRNA gene sequencing, we assess microbial community diversity and coding potential in the foregut, midgut, and hindgut of a juvenile Panchlora cockroach, which resides in the refuse piles of the leaf-cutter ant species Atta colombica...
2017: PloS One
https://www.readbyqxmd.com/read/28541746/the-evolving-cystic-fibrosis-microbiome-a-comparative-cohort-study-spanning-sixteen-years
#2
Nicole Acosta, Fiona J Whelan, Ranjani Somayaji, Ali Poonja, Michael G Surette, Harvey R Rabin, Michael D Parkins
RATIONALE: The cystic fibrosis (CF) airways are infected with a diverse polymicrobial community. OBJECTIVES: Understanding how changes in the CF microbiome have occurred over time, similar to the observed changes in the prevalence of cultured pathogens, is key in understanding the microbiome's role in disease. METHODS: Drawing from a prospectively collected and maintained sputum biobank, we identified 45 patients with sputum samples collected between the ages of 18-21 years in three successive cohorts of adults transitioning to our CF clinic: A(1997-2000), B(2004-2007), and C(2010-2013)...
May 25, 2017: Annals of the American Thoracic Society
https://www.readbyqxmd.com/read/28534879/epibionts-dominate-metabolic-functional-potential-of-trichodesmium-colonies-from-the-oligotrophic-ocean
#3
Kyle R Frischkorn, Mónica Rouco, Benjamin A S Van Mooy, Sonya T Dyhrman
Trichodesmium is a genus of marine diazotrophic colonial cyanobacteria that exerts a profound influence on global biogeochemistry, by injecting 'new' nitrogen into the low nutrient systems where it occurs. Colonies of Trichodesmium ubiquitously contain a diverse assemblage of epibiotic microorganisms, constituting a microbiome on the Trichodesmium host. Metagenome sequences from Trichodesmium colonies were analyzed along a resource gradient in the western North Atlantic to examine microbiome community structure, functional diversity and metabolic contributions to the holobiont...
May 23, 2017: ISME Journal
https://www.readbyqxmd.com/read/28533691/microbiome-disruption-and-recovery-in-the-fish-gambusia-affinis-following-exposure-to-broad-spectrum-antibiotic
#4
Jeanette M Carlson, Annie B Leonard, Embriette R Hyde, Joseph F Petrosino, Todd P Primm
Antibiotics are a relatively common disturbance to the normal microbiota of humans and agricultural animals, sometimes resulting in severe side effects such as antibiotic-associated enterocolitis. Gambusia affinis was used as a vertebrate model for effects of a broad-spectrum antibiotic, rifampicin, on the skin and gut mucosal microbiomes. The fish were exposed to the antibiotic in the water column for 1 week, and then monitored during recovery. As observed via culture, viable counts from the skin microbiome dropped strongly yet returned to pretreatment levels by 1...
2017: Infection and Drug Resistance
https://www.readbyqxmd.com/read/28533520/the-response-of-a-boreal-deep-sea-sponge-holobiont-to-acute-thermal-stress
#5
R Strand, S Whalan, N S Webster, T Kutti, J K H Fang, H M Luter, R J Bannister
Effects of elevated seawater temperatures on deep-water benthos has been poorly studied, despite reports of increased seawater temperature (up to 4 °C over 24 hrs) coinciding with mass mortality events of the sponge Geodia barretti at Tisler Reef, Norway. While the mechanisms driving these mortality events are unclear, manipulative laboratory experiments were conducted to quantify the effects of elevated temperature (up to 5 °C, above ambient levels) on the ecophysiology (respiration rate, nutrient uptake, cellular integrity and sponge microbiome) of G...
May 22, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28522363/a-bloodstream-infection-by-ruminococcus-gnavus-in-a-patient-with-a-gall-bladder-perforation
#6
Young Jin Kim, Hee Yoon Kang, Yujin Han, Mi Suk Lee, Hee Joo Lee
Ruminococcus gnavus is frequently found among human gut microbiome. However, human bloodstream infections by R. gnavus have been reported only three times. Clinical details were lacking for one case; the other two cases with concurrent bacteremia in patients with diverticulitis. We report a case of R. gnavus bloodstream infection in a patient with a gall bladder perforation suggesting its association with damage to the gastrointestinal tract. R. gnavus was misidentified using biochemical test but 16S rRNA sequencing and Matrix-assisted laser desorption/ionization time-of-flight mass spectrometry were useful for correct identification...
May 15, 2017: Anaerobe
https://www.readbyqxmd.com/read/28521004/guidelines-for-the-prevention-and-treatment-of-travelers-diarrhea-a-graded-expert-panel-report
#7
Mark S Riddle, Bradley A Connor, Nicholas J Beeching, Herbert L DuPont, Davidson H Hamer, Phyllis Kozarsky, Michael Libman, Robert Steffen, David Taylor, David R Tribble, Jordi Vila, Philipp Zanger, Charles D Ericsson
Background: : Travelers' diarrhea causes significant morbidity including some sequelae, lost travel time and opportunity cost to both travelers and countries receiving travelers. Effective prevention and treatment are needed to reduce these negative impacts. Methods: : This critical appraisal of the literature and expert consensus guideline development effort asked several key questions related to antibiotic and non-antibiotic prophylaxis and treatment, utility of available diagnostics, impact of multi-drug resistant (MDR) colonization associated with travel and travelers' diarrhea, and how our understanding of the gastrointestinal microbiome should influence current practice and future research...
April 1, 2017: Journal of Travel Medicine
https://www.readbyqxmd.com/read/28520899/increased-urinary-trimethylamine-n-oxide-tmao-following-cryptosporidium-infection-and-protein-malnutrition-independent-of-microbiome-effects
#8
D T Bolick, J Mayneris-Perxachs, G L Medlock, G L Kolling, J Papin, J R Swann, R L Guerrant
Cryptosporidium infections have been associated with growth stunting even in the absence of diarrhea. Having previously detailed the effects of protein deficiency on both microbiome and metabolome in this model, we now describe the specific gut microbial and biochemical effects of Cryptosporidium infection. Protein deficient mice were infected with Cryptosporidium parvum oocysts for 6-13 days and compared to uninfected controls. Following infection there was an increase in the urinary excretion of choline- and amino acid-derived metabolites...
May 17, 2017: Journal of Infectious Diseases
https://www.readbyqxmd.com/read/28509357/characterization-of-microbial-mixtures-by-mass-spectrometry
#9
REVIEW
Todd R Sandrin, Plamen A Demirev
MS applications in microbiology have increased significantly in the past 10 years, due in part to the proliferation of regulator-approved commercial MALDI MS platforms for rapid identification of clinical infections. In parallel, with the expansion of MS technologies in the "omics" fields, novel MS-based research efforts to characterize organismal as well as environmental microbiomes have emerged. Successful characterization of microorganisms found in complex mixtures of other organisms remains a major challenge for researchers and clinicians alike...
May 16, 2017: Mass Spectrometry Reviews
https://www.readbyqxmd.com/read/28508867/bloating-and-abdominal-distension-old-misconceptions-and-current-knowledge
#10
REVIEW
Juan R Malagelada, Anna Accarino, Fernando Azpiroz
Bloating, as a symptom and abdominal distension, as a sign, are both common functional-type complaints and challenging to manage effectively. Individual patients may weight differently the impact of bloating and distension on their well-being. Complaints may range from chronic highly distressing pain to simply annoying and unfashionable protrusion of the abdomen. To avoid mishaps, organic bloating, and distension should always be considered first and appropriated assessed. Functional bloating and distension often present in association with other manifestations of irritable bowel syndrome or functional dyspepsia and in that context patients tend to regard them as most troublesome...
May 16, 2017: American Journal of Gastroenterology
https://www.readbyqxmd.com/read/28507320/the-microbiome-regulates-amygdala-dependent-fear-recall
#11
A E Hoban, R M Stilling, G Moloney, F Shanahan, T G Dinan, G Clarke, J F Cryan
The amygdala is a key brain region that is critically involved in the processing and expression of anxiety and fear-related signals. In parallel, a growing number of preclinical and human studies have implicated the microbiome-gut-brain in regulating anxiety and stress-related responses. However, the role of the microbiome in fear-related behaviours is unclear. To this end we investigated the importance of the host microbiome on amygdala-dependent behavioural readouts using the cued fear conditioning paradigm...
May 16, 2017: Molecular Psychiatry
https://www.readbyqxmd.com/read/28507066/the-microbiome-of-site-specific-dental-plaque-of-children-with-different-caries-status
#12
Vincent P Richards, Andres J Alvarez, Amy R Luce, Molly Bedenbaugh, Mary Mitchell, Robert A Burne, Marcelle M Nascimento
The oral microbiota associated with the initiation and progression of dental caries has yet to be fully characterized. The Human Oral Microbe Identification using Next Generation Sequencing (HOMINGS) was used to analyze the microbiomes of site-specific supragingival dental plaques from children with different caries status. Fifty-five children (2-7 years) were assessed at baseline and 12-months, and grouped as: caries-free (CF), caries-active with enamel lesions (CAE), and caries-active with dentin carious lesions (CA)...
May 15, 2017: Infection and Immunity
https://www.readbyqxmd.com/read/28507021/cell-biology-of-tight-junction-barrier-regulation-and-mucosal-disease
#13
Aaron Buckley, Jerrold R Turner
Mucosal surfaces are lined by epithelial cells. In the intestine, the epithelium establishes a selectively permeable barrier that supports nutrient absorption and waste secretion while preventing intrusion by luminal materials. Intestinal epithelia therefore play a central role in regulating interactions between the mucosal immune system and luminal contents, which include dietary antigens, a diverse intestinal microbiome, and pathogens. The paracellular space is sealed by the tight junction, which is maintained by a complex network of protein interactions...
May 15, 2017: Cold Spring Harbor Perspectives in Biology
https://www.readbyqxmd.com/read/28505251/false-discovery-rate-control-incorporating-phylogenetic-tree-increases-detection-power-in-microbiome-wide-multiple-testing
#14
Jian Xiao, Hongyuan Cao, Jun Chen
Motivation: Next generation sequencing technologies have enabled the study of the human microbiome through direct sequencing of microbial DNA, resulting in an enormous amount of microbiome sequencing data. One unique characteristic of microbiome data is the phylogenetic tree that relates all the bacterial species. Closely related bacterial species have a tendency to exhibit a similar relationship with the environment or disease. Thus, incorporating the phylogenetic tree information can potentially improve the detection power for microbiome-wide association studies, where hundreds or thousands of tests are conducted simultaneously to identify bacterial species associated with a phenotype of interest...
May 13, 2017: Bioinformatics
https://www.readbyqxmd.com/read/28503372/endosymbiont-interference-and-microbial-diversity-of-the-pacific-coast-tick-dermacentor-occidentalis-in-san-diego-county-california
#15
Nikos Gurfield, Saran Grewal, Lynnie S Cua, Pedro J Torres, Scott T Kelley
The Pacific coast tick, Dermacentor occidentalis Marx, is found throughout California and can harbor agents that cause human diseases such as anaplasmosis, ehrlichiosis, tularemia, Rocky Mountain spotted fever and rickettsiosis 364D. Previous studies have demonstrated that nonpathogenic endosymbiotic bacteria can interfere with Rickettsia co-infections in other tick species. We hypothesized that within D. occidentalis ticks, interference may exist between different nonpathogenic endosymbiotic or nonendosymbiotic bacteria and Spotted Fever group Rickettsia (SFGR)...
2017: PeerJ
https://www.readbyqxmd.com/read/28498996/protective-factors-in-the-intestinal-microbiome-against-clostridium-difficile-infection-in-recipients-of-allogeneic-hematopoietic-stem-cell-transplantation
#16
Yeon Joo Lee, Esther S Arguello, Robert R Jenq, Eric Littmann, Grace J Kim, Liza C Miller, Lilan Ling, Cesar Figueroa, Elizabeth Robilotti, Miguel-Angel Perales, Juliet N Barker, Sergio Giralt, Marcel R M van den Brink, Eric G Pamer, Ying Taur
Background: Clostridium difficile infection (CDI) is a frequent complication in recipients of allogeneic hematopoietic stem cell transplantation (allo-HSCT), who receive intensive treatments that significantly disrupt the intestinal microbiota. In this study, we examined the microbiota composition of allo-HSCT recipients to identify bacterial colonizers that confer protection against CDI after engraftment. Methods: Feces collected from adult recipients allo-HSCT at engraftment were analyzed; 16S ribosomal RNA genes were sequenced and analyzed from each sample...
April 1, 2017: Journal of Infectious Diseases
https://www.readbyqxmd.com/read/28494786/compositionally-and-functionally-distinct-sinus-microbiota-in-chronic-rhinosinusitis-patients-have-immunological-and-clinically-divergent-consequences
#17
Emily K Cope, Andrew N Goldberg, Steven D Pletcher, Susan V Lynch
BACKGROUND: Chronic rhinosinusitis (CRS) is a heterogeneous disease characterized by persistent sinonasal inflammation and sinus microbiome dysbiosis. The basis of this heterogeneity is poorly understood. We sought to address the hypothesis that a limited number of compositionally distinct pathogenic bacterial microbiota exist in CRS patients and invoke discrete immune responses and clinical phenotypes in CRS patients. RESULTS: Sinus brushings from patients with CRS (n = 59) and healthy individuals (n = 10) collected during endoscopic sinus surgery were analyzed using 16S rRNA gene sequencing, predicted metagenomics, and RNA profiling of the mucosal immune response...
May 12, 2017: Microbiome
https://www.readbyqxmd.com/read/28494084/the-use-of-high-throughput-dna-sequence-analysis-to-assess-the-endophytic-microbiome-of-date-palm-roots-grown-under-different-levels-of-salt-stress
#18
Mahmoud W Yaish, Ibtisam Al-Harrasi, Aliya S Alansari, Rashid Al-Yahyai, Bernard R Glick
Date palms are able to grow under diverse abiotic stress conditions including in saline soils, where microbial communities may be help in the plant's salinity tolerance. These communities able to produce specific growth promoting substances can enhance date palm growth in a saline environment. However, these communities are poorly defined. In the work reported here, the date palm endophytic bacterial and fungal communities were identified using the pyrosequencing method, and the microbial differential abundance in the root upon exposure to salinity stress was estimated...
September 2016: International Microbiology: the Official Journal of the Spanish Society for Microbiology
https://www.readbyqxmd.com/read/28490352/a-diagnostic-biomarker-profile-for-fibromyalgia-syndrome-based-on-an-nmr-metabolomics-study-of-selected-patients-and-controls
#19
Bontle G Malatji, Helgard Meyer, Shayne Mason, Udo F H Engelke, Ron A Wevers, Mari van Reenen, Carolus J Reinecke
BACKGROUND: Fibromyalgia syndrome (FMS) is a chronic pain syndrome. A plausible pathogenesis of the disease is uncertain and the pursuit of measurable biomarkers for objective identification of affected individuals is a continuing endeavour in FMS research. Our objective was to perform an explorative metabolomics study (1) to elucidate the global urinary metabolite profile of patients suffering from FMS, and (2) to explore the potential of this metabolite information to augment existing medical practice in diagnosing the disease...
May 11, 2017: BMC Neurology
https://www.readbyqxmd.com/read/28481406/the-role-of-the-microbiome-in-cancer-development-and-therapy
#20
REVIEW
Aadra P Bhatt, Matthew R Redinbo, Scott J Bultman
Answer questions and earn CME/CNE The human body harbors enormous numbers of microbiota that influence cancer susceptibility, in part through their prodigious metabolic capacity and their profound influence on immune cell function. Microbial pathogens drive tumorigenesis in 15% to 20% of cancer cases. Even larger numbers of malignancies are associated with an altered composition of commensal microbiota (dysbiosis) based on microbiome studies using metagenomic sequencing. Although association studies cannot distinguish whether changes in microbiota are causes or effects of cancer, a causative role is supported by rigorously controlled preclinical studies using gnotobiotic mouse models colonized with one or more specific bacteria...
May 8, 2017: CA: a Cancer Journal for Clinicians
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