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https://www.readbyqxmd.com/read/28339362/diagnostic-performance-of-color-duplex-ultrasonography-along-with-temporal-artery-biopsy-in-suspicion-of-giant-cell-arteritis
#1
Christophe Roncato, Caroline Allix-Béguec, Elisabeth Brottier-Mancini, Bruno Gombert, Guillaume Denis
OBJECTIVES: Giant cell arteritis (GCA) is a vasculitis that occurs in older adults, affecting vessels of medium and large caliber. GCA diagnosis is a challenge for general practitioners and specialists. The aim of this study was to retrospectively analyse performances of temporal artery biopsy (TAB) and color duplex ultrasonography (CDU) for GCA diagnosis. METHODS: All patients with suspicion of GCA and who underwent both TAB and CDU between April 2009 and March 2014 were included in the study...
March 20, 2017: Clinical and Experimental Rheumatology
https://www.readbyqxmd.com/read/28338690/a-viscous-solvent-enables-information-transfer-from-gene-length-nucleic-acids-in-a-model-prebiotic-replication-cycle
#2
Christine He, Isaac Gállego, Brandon Laughlin, Martha A Grover, Nicholas V Hud
Many hypotheses concerning the nature of early life assume that genetic information was once transferred through the template-directed synthesis of RNA, before the emergence of coded enzymes. However, attempts to demonstrate enzyme-free, template-directed synthesis of nucleic acids have been limited by 'strand inhibition', whereby transferring information from a template strand in the presence of its complementary strand is inhibited by the stability of the template duplex. Here, we use solvent viscosity to circumvent strand inhibition, demonstrating information transfer from a gene-length template (>300 nt) within a longer (545 bp or 3 kb) duplex...
April 2017: Nature Chemistry
https://www.readbyqxmd.com/read/28338457/transplant-renal-vein-thrombosis
#3
Khaled El Zorkany, Julie-Michelle Bridson, Ajay Sharma, Ahmed Halawa
Transplant renal vein thrombosis usually occurs early after surgery with a reported prevalence of 0.1% to 4.2%. It is a devastating event that ultimately leads to graft loss in almost all cases. There are many predisposing factors related to donor, recipient, surgery, and immunosuppression, with mechanical factors being considered the most common causes of transplant renal vein thrombosis. The clinical manifestations of acute renal vein thrombosis are nonspecific and are not dissimilar to the features of urine leak, urinary obstruction, or severe acute rejection...
April 2017: Experimental and Clinical Transplantation
https://www.readbyqxmd.com/read/28336682/molecular-mechanism-of-mrna-repression-in-trans-by-a-proq-dependent-small-rna
#4
Alexandre Smirnov, Chuan Wang, Lisa L Drewry, Jörg Vogel
Research into post-transcriptional control of mRNAs by small noncoding RNAs (sRNAs) in the model bacteria Escherichia coli and Salmonella enterica has mainly focused on sRNAs that associate with the RNA chaperone Hfq. However, the recent discovery of the protein ProQ as a common binding partner that stabilizes a distinct large class of structured sRNAs suggests that additional RNA regulons exist in these organisms. The cellular functions and molecular mechanisms of these new ProQ-dependent sRNAs are largely unknown...
March 23, 2017: EMBO Journal
https://www.readbyqxmd.com/read/28335718/rnav-2-0-a-visualization-tool-for-bacterial-srna-mediated-regulatory-networks-mining
#5
Romain Bourqui, Isabelle Dutour, Jonathan Dubois, William Benchimol, Patricia Thébault
BACKGROUND: Bacterial sRNA-mediated regulatory networks has been introduced as a powerful way to analyze the fast rewiring capabilities of a bacteria in response to changing environmental conditions. The identification of mRNA targets of bacterial sRNAs is essential to investigate their functional activities. However, this step remains challenging with the lack of knowledge of the topological and biological constraints behind the formation of sRNA-mRNA duplexes. Even with the most sophisticated bioinformatics target prediction tools, the large proportion of false predictions may be prohibitive for further analyses...
March 23, 2017: BMC Bioinformatics
https://www.readbyqxmd.com/read/28335318/a-label-free-and-sensitive-fluorescent-qualitative-assay-for-bisphenol-a-based-on-rolling-circle-amplification-exonuclease-iii-combined-cascade-amplification
#6
Xia Li, Juan Song, Qing-Wang Xue, Fu-Heng You, Xia Lu, Yan-Cong Kong, Shu-Yi Ma, Wei Jiang, Chen-Zhong Li
Bisphenol A (BPA) detection in drinking water and food packaging materials has attracted much attention since the discovery that BPA can interfere with normal physiological processes and cause adverse health effects. Here, we constructed a label-free aptamer fluorescent assay for selective and sensitive detection of BPA based on the rolling circle amplification (RCA)/Exonuclease III (Exo III)-combined cascade amplification strategy. First, the duplex DNA probe (RP) with anti-BPA aptamer and trigger sequence was designed for BPA recognition and signal amplification...
October 21, 2016: Nanomaterials
https://www.readbyqxmd.com/read/28334906/conformational-polymorphism-or-structural-invariance-in-dna-photoinduced-lesions-implications-for-repair-rates
#7
François Dehez, Hugo Gattuso, Emmanuelle Bignon, Christophe Morell, Elise Dumont, Antonio Monari
DNA photolesions constitute a particularly deleterious class of molecular defects responsible for the insurgence of a vast majority of skin malignant tumors. Dimerization of two adjacent thymines or cytosines mostly gives rise to cyclobutane pyrimidine dimers (CPD) and pyrimidine(6-4)pyrimidone 64-PP as the most common defects. We perform all-atom classical simulations, up to 2 μs, of CPD and 64-PP embedded in a 16-bp duplex, which reveal the constrasted behavior of the two lesions. In particular we evidence a very limited structural deformation induced by CPD while 64-PP is characterized by a complex structural polymorphism...
February 28, 2017: Nucleic Acids Research
https://www.readbyqxmd.com/read/28334863/consecutive-non-natural-pz-nucleobase-pairs-in-dna-impact-helical-structure-as-seen-in-50-%C3%AE-s-molecular-dynamics-simulations
#8
Robert W Molt, Millie M Georgiadis, Nigel G J Richards
Little is known about the influence of multiple consecutive 'non-standard' ( , 6-amino-5-nitro-2(1H)-pyridone, and , 2-amino-imidazo[1,2-a]-1,3,5-triazin-4(8H)-one) nucleobase pairs on the structural parameters of duplex DNA. nucleobase pairs follow standard rules for Watson-Crick base pairing but have rearranged hydrogen bonding donor and acceptor groups. Using the X-ray crystal structure as a starting point, we have modeled the motions of a DNA duplex built from a self-complementary oligonucleotide (5΄-CTTATPPPZZZATAAG-3΄) in water over a period of 50 μs and calculated DNA local parameters, step parameters, helix parameters, and major/minor groove widths to examine how the presence of multiple, consecutive nucleobase pairs might impact helical structure...
February 28, 2017: Nucleic Acids Research
https://www.readbyqxmd.com/read/28334744/stabilization-of-rna-hairpins-using-non-nucleotide-linkers-and-circularization
#9
Agnieszka Kiliszek, Leszek Blaszczyk, Ryszard Kierzek, Wojciech Rypniewski
An RNA hairpin is an essential structural element of RNA. Hairpins play crucial roles in gene expression and intermolecular recognition but are also involved in the pathogenesis of some congenital diseases. Structural studies of the hairpin motifs are impeded by their thermodynamic instability, as they tend to unfold to form duplexes, especially at high concentrations required for crystallography or nuclear magnetic resonance spectroscopy. We have elaborated techniques to stabilize the RNA hairpins by linking the free ends of the RNA strand at the base of the hairpin stem...
February 21, 2017: Nucleic Acids Research
https://www.readbyqxmd.com/read/28333838/wilms-tumor-extension-into-duplex-ureter-in-a-10-year-old-girl
#10
İbrahim Karnak, Mithat Haliloğlu, Diclehan Orhan, Tezer Kutluk
Ureteral extension of Wilms tumor (WT) is a rare occasion. The association of duplex collecting system and WT is extremely rare. Ureteral extension of WT in a duplex collecting system is an unreported entity to date. A 10-year-old girl presenting with WT extending into upper pole ureter of duplex system is reported to emphasize the importance of preoperative diagnosis to plan step by step surgery in this rare coincidental situation.
April 2017: Journal of Pediatric Hematology/oncology
https://www.readbyqxmd.com/read/28332927/leptospira-spp-in-small-mammals-from-areas-with-low-and-high-human-hantavirus-incidences-in-south-west-germany
#11
Anna Obiegala, Christoph Albrecht, Maysaa Dafalla, Stephan Drewes, Carolin Oltersdorf, Hendrik Turni, Christian Imholt, Jens Jacob, Christiane Wagner-Wiening, Rainer G Ulrich, Martin Pfeffer
INTRODUCTION: Leptospirosis is caused by Leptospira spp. and is considered the most widespread zoonotic disease worldwide. It mimics nephropathia epidemica in humans, a disease mainly caused by Puumala hantavirus (PUUV). Small mammals are reservoirs for Leptospira spp. and PUUV. Seewis virus (SWSV) is a shrew-borne hantavirus with unknown pathogenicity. The objective of this study was to estimate the prevalence for Leptospira spp. and the frequency of Leptospira-hantavirus co-infections in small mammals collected at locations with high and low incidences in humans...
March 23, 2017: Vector Borne and Zoonotic Diseases
https://www.readbyqxmd.com/read/28332825/oligonucleotides-containing-aminated-2-amino-lna-nucleotides-synthesis-and-strong-binding-to-complementary-dna-and-rna
#12
Chenguang Lou, Simone V Samuelsen, Niels Johan Christensen, Birte Vester, Jesper Wengel
Mono- and diaminated 2'-amino-LNA monomers were synthesized and introduced into oligonucleotides. Each modification imparts significant stabilization of nucleic acid duplexes and triplexes, excellent sequence selectivity and significant nuclease resistance. Molecular modelling suggested that structural stabilization occurs via intrastrand electrostatic attraction between the protonated amino groups of the aminated 2'-amino-LNA monomers and the host oligonucleotide backbone.
March 23, 2017: Bioconjugate Chemistry
https://www.readbyqxmd.com/read/28332758/microrna-microrna-complementarity-is-important-for-the-regulation-pattern-of-nfya5-by-mir169-under-dehydration-shock-in-arabidopsis
#13
Qingguo Du, Meng Zhao, Wei Gao, Suzhen Sun, Wen-Xue Li
MicroRNAs regulate gene expression at the mRNA and translational levels. Although our previous research showed that expression of miR169 and one of its targets, NFYA5, is down- and up-regulated by drought stress, respectively, the current study shows that expression of both miR169 and NFYA5 are induced by dehydration shock. Unlike overexpression of MIR169a/b, overexpression of MIR169i/l did not decrease NFYA5 transcripts but increased NFYA5 protein levels. NFYA5 protein abundance also increased in mir169a knock-out mutants and 35S::MIR169l mir169a double mutants...
March 23, 2017: Plant Journal: for Cell and Molecular Biology
https://www.readbyqxmd.com/read/28330874/high-resolution-3d-nmr-structure-of-the-kras-proto-oncogene-promoter-reveals-key-features-of-a-g-quadruplex-involved-in-transcriptional-regulation
#14
Abdelaziz Kerkour, Julien Marquevielle, Stefaniia Ivashchenko, Liliya A Yatsunyk, Jean-Louis Mergny, Gilmar F Salgado
Non-canonical base pairing within guanine-rich DNA and RNA sequences can produce G-quartets, whose stacking leads to the formation of a G-quadruplex (G4). G4s can coexist with canonical duplex DNA in the human genome and have been suggested to suppress gene transcription, and much attention has therefore focused on studying G4s in promotor regions of disease-related genes. For example, the human KRAS proto-oncogene contains a nuclease-hypersensitive element (1) located upstream of the major transcription start site...
March 22, 2017: Journal of Biological Chemistry
https://www.readbyqxmd.com/read/28330435/idiopathic-carotidynia
#15
Aleksandra Policha, David Williams, Mark Adelman, Frank Veith, Neal S Cayne
Idiopathic carotidynia is a syndrome characterized by pain and tenderness over the carotid artery without an associated structural luminal abnormality. Controversy exists over whether this is a distinct disease entity or merely a symptom attributable to other causes of neck pain, such as carotid dissection or vasculitis. A 50-year-old woman presented with sudden-onset right neck pain. Imaging studies demonstrated transmural inflammation of the proximal internal carotid artery, without evidence of intraluminal pathology...
April 2017: Vascular and Endovascular Surgery
https://www.readbyqxmd.com/read/28330434/is-there-an-effect-of-race-ethnicity-on-early-complications-of-iliac-vein-stenting
#16
Ahmad Alsheekh, Anil Hingorani, Samson Ferm, Pavel Kibric, Afsha Aurshina, Natalie Marks, Enrico Ascher
Background There have been well-documented implications of race/ethnicity on the outcome of various vascular diseases. Little literature has examined the effect of race/ethnicity on venous disease. Iliac vein stenting is an emerging technology in treating chronic venous insufficiency. To further characterize this disease and its treatment, we chose to study the effect of selected clinical factors including race/ethnicity on the early complications of non-thrombotic iliac vein stenting. Methods In this observational study, data analysis was performed for 623 patients with chronic venous insufficiency who underwent iliac vein stenting during the time period from August 2012 to September 2014...
January 1, 2017: Vascular
https://www.readbyqxmd.com/read/28329678/human-rad52-captures-and-holds-dna-strands-increases-dna-flexibility-and-prevents-melting-of-duplex-dna-implications-for-dna-recombination
#17
Ineke Brouwer, Hongshan Zhang, Andrea Candelli, Davide Normanno, Erwin J G Peterman, Gijs J L Wuite, Mauro Modesti
Human RAD52 promotes annealing of complementary single-stranded DNA (ssDNA). In-depth knowledge of RAD52-DNA interaction is required to understand how its activity is integrated in DNA repair processes. Here, we visualize individual fluorescent RAD52 complexes interacting with single DNA molecules. The interaction with ssDNA is rapid, static, and tight, where ssDNA appears to wrap around RAD52 complexes that promote intra-molecular bridging. With double-stranded DNA (dsDNA), interaction is slower, weaker, and often diffusive...
March 21, 2017: Cell Reports
https://www.readbyqxmd.com/read/28328821/is-carotid-sonography-a-useful-tool-for-predicting-functional-capabilities-in-ischemic-stroke-patients-following-carotid-artery-stenting
#18
Chih-Ming Lin, Jian-Chi Su, Yu-Jun Chang, Chi-Kuang Liu, Henry Horng-Shing Lu, Yuh-Jyh Jong
Carotid stenosis is a major cause of stroke and timely intervention with stenting manipulation can significantly reduce the risk of secondary stroke. The impact of stenting procedures on patient functional capabilities has not yet been explored. The primary aim of this study was to examine associations between periprocedural carotid sonography parameters and post-treatment functional capabilities in stroke patients.Sixty-seven patients who received carotid stenting at 1 angiography laboratory were included...
March 2017: Medicine (Baltimore)
https://www.readbyqxmd.com/read/28328196/how-does-pyridine-actually-disassemble-and-assemble-spherical-nucleic-acids
#19
Yoon Hyuck Kim, Ju-Hwan Oh, Abigail Lytton-Jean, Jae-Seung Lee
The spotlighted dual functions of pyridine as a denaturant and as a stabilizer for duplex DNA are thoroughly investigated using spherical nucleic acids (SNAs). At neutral pH, pyridine destabilizes the duplex interconnects of assembled SNAs, result-ing in a gradual decrease in their melting temperature (Tm) as a function of the pyridine concentration. This result is in good agreement with the conventional role of pyridine as a powerful denaturant for free duplex DNA. On the contrary, the addi-tion of pyridine dramatically increases the Tm of hybridized SNAs under acidic conditions, which could be a striking result of pyridine's stabilizing effect for DNA duplex as previously suggested based on the pyridine-nucleobase interactions...
March 22, 2017: Analytical Chemistry
https://www.readbyqxmd.com/read/28327779/-occurrence-of-genotypes-of-porcine-circovirus-in-pig-farms-using-different-vaccination-strategies
#20
Matthias Eddicks, Florian Szikora, Nils Walhöfer, Carola Sauter Louis, Sven Reese, Elisabeth Banholzer, Gerald Reiner, Gerd Sutter, Mathias Ritzmann, Robert Fux
OBJECTIVE: Since 2004/2005 a worldwide shift of the detection rate of porcine circovirus (PCV) has been observed from PCV2a towards PCV2b. Currently commercially available vaccines are based on genotype PCV2a. The study was conducted as a pilot study to evaluate the occurrence of PCV2a and PCV2b in farms with different vaccination strategies against PCV2. MATERIAL AND METHODS: For this purpose a total of 405 piglets originating from nine farms (three farms with sow vaccination [SI], piglet vaccination [FI] and no vaccination [NI] against PCV2, respectively) were enrolled and followed from day 3 of life until slaughter...
March 22, 2017: Tierärztliche Praxis. Ausgabe G, Grosstiere/Nutztiere
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