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https://www.readbyqxmd.com/read/28727985/comparative-study-and-analytical-verification-of-pcr-methods-for-the-diagnosis-of-congenital-chagas-disease
#1
Carolina Inés Cura, Juan Carlos Ramírez, Marcelo Rodríguez, Constanza Lopez-Albízu, Lucía Irazu, Karenina Scollo, Sergio Sosa-Estani
Congenital infection is currently the first cause of new cases of Chagas disease in Argentina and nonendemic areas worldwide. Its diagnosis is of utmost importance to guarantee curative treatment. To improve such diagnosis, a transfer process of PCR tests to the national laboratory network has been initiated. We performed a comparative study of four PCR assays [two end-point PCR and two duplex real-time quantitative PCR (qPCR) procedures] to detect Trypanosoma cruzi DNA in blood samples. Because satellite DNA and kinetoplastid DNA qPCR methods have the best performance and the use of two different molecular targets for confirmatory purposes has been recommended, these methods selected to perform the transfer process and, in consequence, subjected to an analytical verification protocol based on international guidelines...
July 17, 2017: Journal of Molecular Diagnostics: JMD
https://www.readbyqxmd.com/read/28726950/one-dna-strand-homo-polymerizes-into-defined-nanostructures
#2
Mo Li, Hua Zuo, Jinwen Yu, Xinfeng Zhao, Chengde Mao
We report a strategy for programmed DNA self-assembly that is favorable in terms of both thermodynamics and kinetics. In a previous study, it has been demonstrated that DNA self-assembly is primarily driven by thermodynamics and the assembly kinetics is not considered. To reach such stable states at equilibria, prolonged annealing duration is needed. In addition, there are cases where the desired structures could not compete with alternative structures. For example, a single-stranded DNA with a palindromic sequence quickly folds into a one-stranded hairpin instead of forming a two-stranded DNA duplex...
July 20, 2017: Nanoscale
https://www.readbyqxmd.com/read/28724605/heterozygous-loss-of-function-mutation-in-odd-skipped-related-1-osr1-is-associated-with-vesico-ureteric-reflux-duplex-systems-and-hydronephrosis
#3
Marie-Lyne Fillion, Jasmine El Andalousi, Fatima Tokhmafshan, Vasikar Murugapoopathy, Christine L Watt, Inga J Murawski, John-Paul Capolicchio, Mohamed El-Sherbiny, Roman Jednak, Indra Rani Gupta
Osr1 is a transcriptional repressor that plays critical roles in maintaining the mesenchymal stem cell population within the developing kidney. Here, we report that newborn pups with a heterozygous null mutation in Osr1 exhibit a 21% incidence of vesico-ureteric reflux and have hydronephrosis and urinary tract duplications. Newborn pups have a short intravesical ureter resulting in a less competent uretero-vesical junction which arises from a delay in urinary tract development. We describe a new domain of Osr1 expression in the ureteral mesenchyme and within the developing bladder in the mouse...
July 19, 2017: American Journal of Physiology. Renal Physiology
https://www.readbyqxmd.com/read/28724560/accurate-detection-of-methicillin-resistant-staphylococcus-aureus-in-mixtures-utilizing-single-bacterial-duplex-droplet-digital-pcr
#4
Jun Luo, Junhua Li, Hang Yang, Junping Yu, Hongping Wei
Accurate and rapid identification of methicillin-resistant Staphylococcus aureus (MRSA) is needed to screen MRSA carriers and improve treatment. The current widely used duplex PCR methods are not able to differentiate MRSA from the co-existence of methicillin-susceptible S. aureus (MSSA) and other methicillin-resistant Staphylococci In this study, we aimed to develop a direct method for accurate and rapid detection of MRSA in clinical samples from open environments, such as nasal swab. The new molecular assay is based on detecting the co-occurrence of nuc and mecA markers in a single bacterial cell by utilizing droplet digital PCR (ddPCR) with a chimeric lysin ClyH for cell lysis...
July 19, 2017: Journal of Clinical Microbiology
https://www.readbyqxmd.com/read/28723162/ultrasensitive-detection-of-cancer-prognostic-mirna-biomarkers-based-on-surface-plasmon-enhanced-light-scattering
#5
Chih-Tsung Yang, Mohammad Pourhassan-Moghaddam, Lin Wu, Ping Bai, Benjamin Thierry
The development of simple yet ultrasensitive biosensing approaches for the detection of cancer prognostic microRNA is an important step toward their successful clinical implementation. We demonstrate the relevance for the detection of circulating miRNA of a novel signal amplification scheme based on surface plasmon resonance enhanced light scattering (SP-LS). In addition to experimental optimization carried out using gold nanoparticle (AuNP) tags conjugated with a monoclonal antibody with high affinity for RNA*DNA hybrid duplexes, simulation modeling was conducted to obtain insights about SP-LS biosensing...
May 26, 2017: ACS Sensors
https://www.readbyqxmd.com/read/28723114/simultaneous-imaging-of-three-tumor-related-mrnas-in-living-cells-with-a-dna-tetrahedron-based-multicolor-nanoprobe
#6
Song Wang, Mengchan Xia, Jie Liu, Sichun Zhang, Xinrong Zhang
We constructed a DNA tetrahedron based multicolor nanoprobe, which could simultaneously imaging of three tumor-related mRNAs in living cells through fluorescence restoration caused by competitive chain replacement reaction. The oligonucleotides used to construct the tetrahedron were extended by adding three 21-base recognition sequences modified with different fluorophores (FAM, Cy3, and Cy5) in the 5' end. Three 11-base complementary sequences modified with quencher (BHQ1 for FAM and BHQ2 for Cy3 and Cy5) were hybridized with the recognition sequences to quench the fluorescence...
June 23, 2017: ACS Sensors
https://www.readbyqxmd.com/read/28722430/multi-amplified-sensing-of-microrna-by-a-small-dna-fragment-driven-enzymatic-cascade-reaction
#7
Eunjung Kim, Philip D Howes, Spencer W Crowder, Molly M Stevens
Combining technological developments such as nanomaterials, DNA nanotechnology, and functional enzymes has great potential to facilitate next generation high performance molecular diagnostic systems. In this work, we describe a microRNA (miRNA) detection assay that combines target recycling and isothermal amplification in an elegantly designed enzyme-mediated cascade reaction. Target recycling is driven by the action of duplex-specific nuclease (DSN), resulting in highly amplified translation of input miRNA to short output DNA fragments...
January 27, 2017: ACS Sensors
https://www.readbyqxmd.com/read/28721102/vulvar-varicosities-diagnosis-treatment-and-prevention
#8
Sergey G Gavrilov
OBJECTIVE: Vulvar varicosity is a relatively common venous disorder in women with varicose veins of the pelvis and lower extremities and in pregnant women, but there is little information in the medical literature concerning its diagnosis and management. The aim of this study was to describe our experience with 101 women with vulvar varicosities who were examined and treated at our center during 2000-2014. PATIENTS AND METHODS: Patients were divided into two groups: group 1 with 61 women with varicose veins of the pelvis and enlarged vulvar veins, and group 2 with 40 pregnant women (11-38 weeks of pregnancy) with vulvar varicosities...
2017: International Journal of Women's Health
https://www.readbyqxmd.com/read/28719301/development-of-a-real-time-reverse-transcription-polymerase-chain-reaction-for-o-nyong-nyong-virus-and-evaluation-with-clinical-and-mosquito-specimens-from-kenya
#9
Jesse Waggoner, Claire Jane Heath, Bryson Ndenga, Francis Mutuku, Malaya K Sahoo, Alisha Mohamed-Hadley, John Vulule, Dunstan Mukoko, A Desiree LaBeaud, Benjamin A Pinsky
O'nyong-nyong virus (ONNV), an alphavirus closely related to chikungunya virus (CHIKV), has been the documented cause of two large outbreaks in east Africa; however, little is known about the contribution of ONNV to cases of acute febrile illness during interepidemic periods. An ONNV real-time reverse transcription polymerase chain reaction (rRT-PCR) was developed and evaluated using clinical and mosquito pool samples. The ONNV rRT-PCR linear range extended from 8.0 to 2.0 log10 copies/μL, and the lower limit of 95% detection was 22...
July 2017: American Journal of Tropical Medicine and Hygiene
https://www.readbyqxmd.com/read/28719194/molecular-modeling-of-the-major-dna-adduct-formed-from-the-food-mutagen-ochratoxin-a-in-nari-2-base-deletion-duplexes-impact-of-sequence-context-and-adduct-ionization-on-conformational-preference-and-mutagenicity
#10
Preetleen Kathuria, Purshotam Sharma, Richard A Manderville, Stacey D Wetmore
Exposure to ochratoxin A (OTA), a possible human carcinogen, leads to many different DNA mutations. As a first step toward understanding the structural basis of OTA-induced mutagenicity, the present work uses a robust computational approach and a slipped mutagenic intermediate model previously studied for C(8)-dG aromatic amine adducts to analyze the conformational features of post-replication 2-base deletion DNA duplexes containing OT-dG, the major OTA lesion at the C(8) position of guanine. Specifically, a total of 960 ns of molecular dynamics simulations (excluding trial simulations) were carried out on four OT-dG ionization states in three sequence contexts within oligomers containing the NarI recognition sequence, a known hotspot for deletion mutations induced by related adducts formed from known carcinogens...
July 18, 2017: Chemical Research in Toxicology
https://www.readbyqxmd.com/read/28718606/-interventional-treatment-of-venous-insufficiency
#11
Barbara Ney, Rolf P Engelberger, Amin Dabiri, Jean-François Lüthi, Andreas Erdmann, Caroline Krieger, Sébastien Déglise, Thierry Merminod, Philippe Kern, Lucia Mazzolai
Interventional treatment of venous insufficiency has been revolutionized by endovascular techniques. Some of these techniques, and particularly thermal ablation (endovenous laser, radiofrequency) are now recommended as first-line therapy in the latest international guidelines. This is because of less post-operative pain, a shorter leave from employment and similar or lower recurrence rate. Endovenous techniques allow safer and more efficient treatment of certain particular conditions : small saphenous vein, ulcers, and recurrent varicose veins...
March 15, 2017: Revue Médicale Suisse
https://www.readbyqxmd.com/read/28717992/melting-of-polymeric-dna-double-helix-at-elevated-temperature-a-molecular-dynamics-approach
#12
Sangeeta Kundu, Sanchita Mukherjee, Dhananjay Bhattacharyya
Genomic DNA of higher organisms exists as extremely long polymers, while in bacteria and other lower organisms it is circular with no terminal base pairs. Temperature-induced melting of the DNA double helix by localized strand separation has been unattainable by molecular dynamic simulations due to more rapid fraying of the terminal base pairs in oligomeric DNA. However, local-sequence-dependent unfolding of the DNA double helix is extremely important for understanding various biochemical phenomena, and can be addressed by simulating a model polymeric DNA duplex...
August 2017: Journal of Molecular Modeling
https://www.readbyqxmd.com/read/28717917/-acute-right-sided-upper-abdominal-pain-in-a-46-year-old-woman
#13
M Bauder, A Fiala, C Klinger, W Kersjes, K Caca
A 46-year-old woman presented with acute abdominal pain in the right upper quadrant. Esophagogastroduodenoscopy revealed a duodenal stenosis within the horizontal part of the duodenum. Based on the findings of abdominal computed tomography (CT), endosonography, Doppler duplex sonography and angiography, the diagnosis of an aneurysm of a branch of the inferior pancreaticoduodenal artery was established. This arterial branch was part of a collateral circulation between the superior mesenteric artery and the proper hepatic artery caused by obturation of the celiac artery...
July 17, 2017: Der Internist
https://www.readbyqxmd.com/read/28717350/properties-of-native-high-density-lipoproteins-inspire-synthesis-of-actively-targeted-in-vivo-sirna-delivery-vehicles
#14
Kaylin M McMahon, Michael P Plebanek, C Shad Thaxton
Efficient systemic administration of therapeutic short interfering RNA (siRNA) is challenging. High-density lipoproteins (HDL) are natural in vivo RNA delivery vehicles. Specifically, native HDLs: 1) Load single-stranded RNA; 2) Are anionic, which requires charge reconciliation between the RNA and HDL, and 3) Actively target scavenger receptor type B-1 (SR-B1) to deliver RNA. Emphasizing these particular parameters, we employed templated lipoprotein particles (TLP), mimics of spherical HDLs, and self-assembled them with single-stranded complements of, presumably, any highly unmodified siRNA duplex pair after formulation with a cationic lipid...
November 15, 2016: Advanced Functional Materials
https://www.readbyqxmd.com/read/28717121/impact-of-doppler-ultrasound-on-diagnosis-and-therapy-control-of-lienalis-steal-syndrome-after-liver-transplantation
#15
Eva M Teegen, Timm Denecke, Rosa B Schmuck, Robert Öllinger, Dominik Geisel, Johann Pratschke, Sascha S Chopra
BACKGROUND Lienalis steal syndrome is a rare complication after orthotopic liver transplantation leading to severe complications. Routine duplex sonography allows early and safe detection of lienalis steal syndrome and secondarily helps to monitor the outcome by evaluating the hemodynamics. MATERIAL AND METHODS This analysis included eight patients who after orthotopic liver transplantation needed splenic artery embolization due to lienalis steal syndrome. Lienalis steal syndrome was assumed in case of elevated transaminases, bilirubinemia or persistent ascites, and the absence of further pathologies...
July 18, 2017: Annals of Transplantation: Quarterly of the Polish Transplantation Society
https://www.readbyqxmd.com/read/28714359/optimal-sizing-of-iliac-vein-stents
#16
Seshadri Raju, William J Buck, William Crim, Arjun Jayaraj
Background Iliac vein stenting has emerged as a therapeutic option in chronic venous disease. The optimal stent size is unknown but should match normal caliber at a minimum. Methods Teleology: The iliac-femoral outflow caliber was measured by Duplex in healthy volunteers to determine normal caliber. Patient IVUS data: The distribution curve of IVUS planimetry data in 345 chronic venous disease limbs was analyzed: values at the right tail end of the curve should approach normal values according to distribution theory...
January 1, 2017: Phlebology
https://www.readbyqxmd.com/read/28712815/asymptomatic-carotid-stenosis-is-associated-with-cognitive%C3%A2-impairment
#17
Brajesh K Lal, Moira C Dux, Siddhartha Sikdar, Carly Goldstein, Amir A Khan, John Yokemick, Limin Zhao
BACKGROUND: Cerebrovascular risk factors (eg, hypertension, coronary artery disease) and stroke can lead to vascular cognitive impairment. The Asymptomatic Carotid Stenosis and Cognitive Function study evaluated the isolated impact of asymptomatic carotid stenosis (no prior ipsilateral or contralateral stroke or transient ischemic attack) on cognitive function. Cerebrovascular hemodynamic and carotid plaque characteristics were analyzed to elucidate potential mechanisms affecting cognition...
July 13, 2017: Journal of Vascular Surgery
https://www.readbyqxmd.com/read/28712813/factors-affecting-operative-time-and-outcome-of-carotid-endarterectomy-in-the-vascular-quality-initiative
#18
Jennifer L Perri, Brian W Nolan, Philip P Goodney, Randall R DeMartino, Benjamin S Brooke, Shipra Arya, Mark F Conrad, Jack L Cronenwett
OBJECTIVE: Prior studies have suggested a relationship between operative (Op) time and outcome after major vascular procedures. This study analyzed factors associated with Op time and outcome after carotid endarterectomy (CEA) in the Vascular Quality Initiative (VQI) registry. METHODS: Elective, primary CEAs without high anatomic risk or concomitant procedures from 2012 to 2015 in the VQI were analyzed (N = 26,327, performed by 1188 surgeons from 249 centers). Multivariable analysis was used to identify patient, procedure, and surgeon factors associated with Op time and major adverse events (MAEs), categorized as either technical (ipsilateral stroke, cranial nerve injury, reoperation) or cardiac (myocardial infarction, congestive heart failure, dysrhythmia requiring treatment, surgical site infection, and death)...
July 13, 2017: Journal of Vascular Surgery
https://www.readbyqxmd.com/read/28711269/development-of-an-isothermal-amplification-based-assay-for-the-rapid-visual-detection-of-salmonella-bacteria
#19
Hai-Bin Liu, Yu-Xuan Zang, Xin-Jun Du, Ping Li, Shuo Wang
The efficient and timely detection of pathogens is a major concern worldwide. The aim of this study was to establish a rapid detection method for Salmonella bacteria in food samples to facilitate timely treatment. Widely used detection methods currently include culture-based methods and PCR-based methods. The former are time consuming, requiring 2 to 3 d, whereas the latter have higher accuracy but are typically complicated, requiring expertise and expensive instruments. In this study, a sensitive and rapid approach for the visual and point-of-use detection of Salmonella bacteria based on recombinase polymerase amplification (RPA) and a lateral-flow (LF) nucleic acid strip was established...
July 12, 2017: Journal of Dairy Science
https://www.readbyqxmd.com/read/28710838/enzyme-free-ligation-of-5-phosphorylated-oligodeoxynucleotides-in-a-dna-nanostructure
#20
Markus Kramer, Clemens Richert
Multicomponent reactions are difficult synthetic transformations. For DNA, there is a special opportunity to align multiple strands in a folded nanostructure, so that they are preorganized to give a specific sequence. Multistrand reactions in DNA origami structures have previously been performed using photochemical crosslinking, 1,3-diploar cycloadditions or phosphoramidate-forming reactions. Here we report carbodiimide-driven phosphodiester formation in a small origami sheet that produces DNA strands up to 600 nucleotides in length in a single step...
July 15, 2017: Chemistry & Biodiversity
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