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https://www.readbyqxmd.com/read/28525578/cell-type-specific-genome-editing-with-a-microrna-responsive-crispr-cas9-switch
#1
Moe Hirosawa, Yoshihiko Fujita, Callum J C Parr, Karin Hayashi, Shunnichi Kashida, Akitsu Hotta, Knut Woltjen, Hirohide Saito
The CRISPR-Cas9 system is a powerful genome-editing tool useful in a variety of biotechnology and biomedical applications. Here we developed a synthetic RNA-based, microRNA (miRNA)-responsive CRISPR-Cas9 system (miR-Cas9 switch) in which the genome editing activity of Cas9 can be modulated through endogenous miRNA signatures in mammalian cells. We created miR-Cas9 switches by using a miRNA-complementary sequence in the 5΄-UTR of mRNA encoding Streptococcus pyogenes Cas9. The miR-21-Cas9 or miR-302-Cas9 switches selectively and efficiently responded to miR-21-5p in HeLa cells or miR-302a-5p in human induced pluripotent stem cells, and post-transcriptionally attenuated the Cas9 activity only in the target cells...
May 19, 2017: Nucleic Acids Research
https://www.readbyqxmd.com/read/28520869/comparative-pathogenomic-characterization-of-a-non-invasive-serotype-m71-strain-streptococcus-pyogenes-ns53-reveals-incongruent-phenotypic-implications-from-distinct-genotypic-markers
#2
Yun-Juan Bao, Yang Li, Zhong Liang, Garima Agrahari, Shaun W Lee, Victoria A Ploplis, Francis J Castellino
The strains serotyped as M71 from group A Streptococcus are common causes of pharyngeal and skin diseases worldwide. Here we characterize the genome of a unique non-invasive M71 human isolate, NS53. The genome does not contain structural rearrangements or large-scale gene gains/losses, but encodes a full set of non-truncated known virulence factors, thus providing an ideal reference for comparative studies. However, the NS53 genome showed incongruent phenotypic implications from distinct genotypic markers. NS53 is characterized as an emm pattern D and FCT (fibronectin-collagen-T-antigen) type-3 strain, typical of skin tropic strains, but is phylogenetically close to emm pattern E strains with preference for both skin and pharyngeal infections...
May 17, 2017: Pathogens and Disease
https://www.readbyqxmd.com/read/28512590/acute-bacterial-meningitis-and-systemic-abscesses-due-to-streptococcus-dysgalactiae-subsp-equisimilis-infection
#3
M Jourani, T Duprez, V Roelants, H Rodriguez-Villalobos, P Hantson
Disseminated abscesses due to group G β-hemolytic Streptococcus dysgalactiae were observed in a 57-year-old cirrhotic patient with the skin being the putative way of entry for the pathogen. S. dysgalactiae is a rare agent in human infections responsible for acute pyogenic meningitis. The mortality rate associated with S. dysgalactiae bacteraemia and meningitis may be as high as 50%, particularly in the presence of endocarditis or brain abscesses. In our patient, main sites of infections were meningitis and ventriculitis, spondylodiscitis, septic arthritis, and soft-tissue infections...
2017: Case Reports in Infectious Diseases
https://www.readbyqxmd.com/read/28509419/live-cell-crispr-imaging-in-plants-reveals-dynamic-telomere-movements
#4
Steven Dreissig, Simon Schiml, Patrick Schindele, Oda Weiss, Twan Rutten, Veit Schubert, Evgeny Gladilin, Michael Florian Mette, Holger Puchta, Andreas Houben
Elucidating the spatio-temporal organization of the genome inside the nucleus is imperative to understand the regulation of genes and non-coding sequences during development and environmental changes. Emerging techniques of chromatin imaging promise to bridge the long-standing gap between sequencing studies which reveal genomic information and imaging studies that provide spatial and temporal information of defined genomic regions. Here, we demonstrate such an imaging technique based on two orthologues of the bacterial CRISPR-Cas9 system...
May 16, 2017: Plant Journal: for Cell and Molecular Biology
https://www.readbyqxmd.com/read/28504646/the-rna-binding-protein-tristetraprolin-schedules-apoptosis-of-pathogen-engaged-neutrophils-during-bacterial-infection
#5
Florian Ebner, Vitaly Sedlyarov, Saren Tasciyan, Masa Ivin, Franz Kratochvill, Nina Gratz, Lukas Kenner, Andreas Villunger, Michael Sixt, Pavel Kovarik
Protective responses against pathogens require a rapid mobilization of resting neutrophils and the timely removal of activated ones. Neutrophils are exceptionally short-lived leukocytes, yet it remains unclear whether the lifespan of pathogen-engaged neutrophils is regulated differently from that in the circulating steady-state pool. Here, we have found that under homeostatic conditions, the mRNA-destabilizing protein tristetraprolin (TTP) regulates apoptosis and the numbers of activated infiltrating murine neutrophils but not neutrophil cellularity...
May 15, 2017: Journal of Clinical Investigation
https://www.readbyqxmd.com/read/28503338/infrarenal-infected-aortic-aneurysm-caused-by-streptococcus-pyogenes
#6
Floryn Cherbanyk, Markus Menth, Bernhard Egger, Véronique Erard
Infectious aneurysm is a rare entity associated with significant morbidity and mortality. Current knowledge on pathogenesis, outcome, diagnosis, management, and follow-up remains debatable. We report the case of a patient with Streptococcus pyogenes aneurysm who was successfully treated with a homograft implant and discuss microbiological characteristics, diagnostic methods, and treatment options currently available for this serious disease.
2017: Case Reports in Surgery
https://www.readbyqxmd.com/read/28502856/dna-chip-based-sensor-for-amperometric-detection-of-infectious-pathogens
#7
Swati Singh, Ankur Kaushal, Shashi Khare, Ashok Kumar
Several infectious pathogens are found in human whose detection is essential for rapid cure of diseases. The most commonly found pathogen in human is Streptococcus pyogenes which leads to a wide range of infections from mild pharyngitis to rheumatic heart disease. An ultrasensitive DNA chip based sensor was developed for quick identification of pathogen S. pyogenes from patient throat swab samples. The amperometric response was measured after hybridization of specific probe with single stranded genomic DNA (ssG-DNA) from the patient samples...
May 11, 2017: International Journal of Biological Macromolecules
https://www.readbyqxmd.com/read/28502192/short-and-long-term-outcomes-of-streptococcus-pyogenes-pneumonia-managed-in-the-intensive-care-unit
#8
Marie Lecronier, Alexandre Elabbadi, Armand Mekontso Dessap, Nicolas de Prost
No abstract text is available yet for this article.
May 14, 2017: Infectious Diseases
https://www.readbyqxmd.com/read/28495783/draft-genome-sequence-of-streptococcus-dysgalactiae%C3%A2-subsp-%C3%A2-equisimilis-strain-c161l1-isolated-in-vellore-india
#9
Anshu Babbar, D Patric Nitsche-Schmitz, Dietmar H Pieper, Israel Barrantes
Streptococcus dysgalactiae subsp. equisimilis belongs to the β-hemolytic group C and G pyogenic group of streptococci. Here, we report the draft genome of the S. dysgalactiae subsp. equisimilis strain C161L1 from Vellore, a region in southern India with a high incidence rate of S. dysgalactiae subsp. equisimilis infection. This genome is 2.1 Mb long, with a 39.82% G+C content, and encodes 2,022 genes.
May 11, 2017: Genome Announcements
https://www.readbyqxmd.com/read/28483717/surveillance-of-the-activity-of-solithromycin-cem-101-against-bacteria-from-respiratory-tract-infections
#10
Stephen Hawser, Ian Morrissey, Barbara Lemos, Kara Keedy, Prabhavathi Fernandes
The activity of solithromycin, a fourth-generation macrolide and novel fluoroketolide, was evaluated by determining its minimum inhibitory concentration (MIC) (via Clinical and Laboratory Standards Institute broth microdilution) against 2797 contemporary clinical respiratory tract isolates collected from North America, Europe, Asia-Pacific and other regions of the world in 2012-13. Solithromycin was very active against Streptococcus pneumoniae and Streptococcus pyogenes, with MIC90 of 0.25 and 0.12 µg/mL, respectively...
May 5, 2017: International Journal of Antimicrobial Agents
https://www.readbyqxmd.com/read/28470079/validity-of-somatic-cell-count-as-indicator-of-pathogen-specific-intramammary-infections
#11
Inge-Marié Petzer, Joanne Karzis, Edward F Donkin, Edward C Webb, Eric M C Etter
The objective of this study was to determine whether somatic cell count (SCC) was an effective test, with a sensitivity exceeding 85%, to determine species-specific bacterial infections. In addition, the relation between the SCC and various udder pathogen groups was investigated. SCC thresholds of greater than 200 000 cells/mL were used in quarter and greater than 150 000 cells/mL in composite milk samples. A retrospective study was conducted on a data set for 89 635 quarter and 345 467 composite cow milk samples...
April 13, 2017: Journal of the South African Veterinary Association
https://www.readbyqxmd.com/read/28470013/pyogenic-pericarditis-and-cardiac-tamponade-due-to-streptococcus-anginosus-in-a-combat-theater
#12
Ryan C Maves, Michael S Tripp, Tracy Franzos, Scott C Wallace, Benjamin J Drinkwine, Todd C Villines
Streptococcus anginosus group pericarditis is rare. A 24-year-old male soldier presented for care at a military clinic in Afghanistan with shock and cardiac tamponade requiring emergent pericardial drainage and aeromedical evacuation. We review the patient's case, the need for serial pericardial drainage, and the available literature on this disorder.
2017: Open Forum Infectious Diseases
https://www.readbyqxmd.com/read/28469274/crispr-cpf1-assisted-genome-editing-of-corynebacterium-glutamicum
#13
Yu Jiang, Fenghui Qian, Junjie Yang, Yingmiao Liu, Feng Dong, Chongmao Xu, Bingbing Sun, Biao Chen, Xiaoshu Xu, Yan Li, Renxiao Wang, Sheng Yang
Corynebacterium glutamicum is an important industrial metabolite producer that is difficult to genetically engineer. Although the Streptococcus pyogenes (Sp) CRISPR-Cas9 system has been adapted for genome editing of multiple bacteria, it cannot be introduced into C. glutamicum. Here we report a Francisella novicida (Fn) CRISPR-Cpf1-based genome-editing method for C. glutamicum. CRISPR-Cpf1, combined with single-stranded DNA (ssDNA) recombineering, precisely introduces small changes into the bacterial genome at efficiencies of 86-100%...
May 4, 2017: Nature Communications
https://www.readbyqxmd.com/read/28464492/renewal-of-peritonsillar-abscess-impact-of-the-bacterial-species-of-the-infection-and-clinical-features-of-the-patient-prospective-comparative-aetiological-study
#14
Johanna Wikstén, Enni Kaltiainen, Anne Pitkäranta, Karin Blomgren
OBJECTIVES: To compare the bacterial species and patient clinical features in peritonsillar abscesses between patients who had renewal (renewal group) and those who did not (recovery group). DESIGN: Prospective comparative aetiological study. SETTING: Tertiary referral centre. PARTICIPANTS: A total of 180 adult peritonsillar abscess patients were prospectively collected and treated as outpatients with incision and drainage and oral antibiotics...
May 2, 2017: Clinical Otolaryngology
https://www.readbyqxmd.com/read/28463666/characterisation-of-clinically-isolated-streptococcus-pyogenes-from-balanoposthitis-patients-with-special-emphasis-on-emm89-isolates
#15
Tadao Hasegawa, Nanako Hata, Hideyuki Matsui, Masanori Isaka, Ichiro Tatsuno
PURPOSE: Streptococcus pyogenes causes a variety of diseases, such as pharyngitis and toxic shock syndrome. In addition, this bacterium is a causative agent of balanoposthitis. To reveal the bacteriological characteristics of the isolates from balanoposthitis patients, we analysed 47 isolates. In addition, novel clade genotype emm89 S. pyogenes isolates have been reported to be spreading worldwide recently. Hence, we further analysed eight emm89 isolates. METHODOLOGY: A drug susceptibility experiment was performed and emm types were determined...
April 2017: Journal of Medical Microbiology
https://www.readbyqxmd.com/read/28463664/importance-of-adhesins-in-the-recurrence-of-pharyngeal-infections-caused-by-streptococcus-pyogenes
#16
Aniela Wozniak, Natalia Scioscia, Enrique Geoffroy, Iván Ponce, Patricia García
PURPOSE: Pharyngo-amygdalitis is the most common infection caused by Streptococcus pyogenes (S. pyogenes). Reinfection with strains of different M types commonly occurs. However, a second infection with a strain of the same M type can still occur and is referred to as recurrence. We aimed to assess whether recurrence of S. pyogenes could be associated to erythromycin resistance, biofilm formation or surface adhesins like fibronectin-binding proteins and pilus proteins, both located in the fibronectin-binding, collagen-binding, T-antigen (FCT) region...
April 2017: Journal of Medical Microbiology
https://www.readbyqxmd.com/read/28462035/whole-genome-sequencing-of-group-a-streptococcus-development-and-evaluation-of-an-automated-pipeline-for-emmgene-typing
#17
Georgia Kapatai, Juliana Coelho, Steven Platt, Victoria J Chalker
Streptococcus pyogenes group A Streptococcus (GAS) is the most common cause of bacterial throat infections, and can cause mild to severe skin and soft tissue infections, including impetigo, erysipelas, necrotizing fasciitis, as well as systemic and fatal infections including septicaemia and meningitis. Estimated annual incidence for invasive group A streptococcal infection (iGAS) in industrialised countries is approximately three per 100,000 per year. Typing is currently used in England and Wales to monitor bacterial strains of S...
2017: PeerJ
https://www.readbyqxmd.com/read/28461319/bacteriophage-lysin-cf-301-a-potent-anti-staphylococcal-biofilm-agent
#18
Raymond Schuch, Babar K Khan, Assaf Raz, Jimmy A Rotolo, Michael Wittekind
Biofilms pose a unique therapeutic challenge because of the antibiotic tolerance of constituent bacteria. Treatments for biofilm-based infections represent a major unmet medical need, requiring novel agents to eradicate mature biofilms. Our objective was to evaluate bacteriophage lysin CF-301 as a new agent to target Staphylococcus aureus biofilms. We used minimum biofilm eradicating concentration (MBEC) assays on ninety-five S. aureus strains to obtain a MBEC90 value of ≤0.25 μg/ml for CF-301. Mature biofilms of coagulase-negative staphylococci, Streptococcus pyogenes, and Streptococcus agalactiae were also sensitive to disruption, with MBEC90 values ranging from 0...
May 1, 2017: Antimicrobial Agents and Chemotherapy
https://www.readbyqxmd.com/read/28456061/switchable-cas9
#19
REVIEW
Florian Richter, Ines Fonfara, Renate Gelfert, Jennifer Nack, Emmanuelle Charpentier, Andreas Möglich
Ever since its discovery, Cas9 from Streptococcus pyogenes has revolutionized biology by enabling analysis and engineering of genomes with unprecedented precision and ease. To fine-tune on-target effects and to mitigate adverse effects caused by untimely and off-target action of Cas9, strategies have been developed to control its activity at the post-translational stage via external trigger signals. Control is either achieved by modifying the Cas9 protein itself or its programmable RNA molecules. To date, switchable Cas9 variants responding to small ligands, light or temperature have been engineered...
April 26, 2017: Current Opinion in Biotechnology
https://www.readbyqxmd.com/read/28452015/biodegradation-of-ciprofloxacin-by-white-rot-fungus-pleurotus-ostreatus
#20
Sushil Kumar Singh, Robinka Khajuria, Loveleen Kaur
Unrestricted and reckless use of antibiotics has resulted in their accumulation in environment. This, in turn, has led to the emergence of multiple drug-resistant microbes. The present study focuses on degradation of ciprofloxacin (CIP) by an edible white rot fungus Pleurotus ostreatus. Effect of CIP was determined on radial growth and biomass of P. ostreatus. Titrimetric and spectrophotometric assays were carried out to assess the degrading potential of P. ostreatus towards CIP. It was found that CIP has a stimulatory effect on growth and enzyme activity of P...
May 2017: 3 Biotech
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