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https://www.readbyqxmd.com/read/28820700/rapid-detection-of-plasmodium-knowlesi-by-isothermal-recombinase-polymerase-amplification-assay
#1
Meng-Yee Lai, Choo-Huck Ooi, Yee-Ling Lau
In this study, we developed a recombinase polymerase amplification (RPA) assay for specific diagnosis of Plasmodium knowlesi. Genomic DNA was extracted from whole blood samples using a commercial kit. With incubation at 37°C, the samples were successfully amplified within 20 minutes. The end product of RPA was further examined by loading onto agarose gel and a specific band was observed with a size of 128 bp. The RPA assay exhibited high sensitivity with limits of detection down to one copy of the plasmid...
August 14, 2017: American Journal of Tropical Medicine and Hygiene
https://www.readbyqxmd.com/read/28820304/predictors-of-quality-of-life-and-survival-following-gamma-knife-surgery-for-lung-cancer-brain-metastases-a-prospective-study
#2
Sidsel Bragstad, Marianne Flatebø, Gerd Karin Natvig, Geir Egil Eide, Geir Olve Skeie, Maziar Behbahani, Paal-Henning Pedersen, Per Øyvind Enger, Bente Sandvei Skeie
OBJECTIVE Lung cancer (LC) patients who develop brain metastases (BMs) have a poor prognosis. Estimations of survival and risk of treatment-related deterioration in quality of life (QOL) are important when deciding on treatment. Although we know of several prognostic factors for LC patients with BMs, the role of QOL has not been established. Authors of this study set out to evaluate changes in QOL following Gamma Knife surgery (GKS) for BMs in LC patients and QOL as a prognostic factor for survival. METHODS Forty-four of 48 consecutive LC patients with BMs underwent GKS in the period from May 2010 to September 2011, and their QOL was prospectively assessed before and 1, 3, 6, 9, and 12 months after GKS by using the Functional Assessment of Cancer Therapy-Brain (FACT-BR) questionnaire...
August 18, 2017: Journal of Neurosurgery
https://www.readbyqxmd.com/read/28810858/rapid-and-sensitive-detection-of-canine-distemper-virus-by-real-time-reverse-transcription-recombinase-polymerase-amplification
#3
Jianchang Wang, Jinfeng Wang, Ruiwen Li, Libing Liu, Wanzhe Yuan
BACKGROUND: Canine distemper, caused by Canine distemper virus (CDV), is a highly contagious and fatal systemic disease in free-living and captive carnivores worldwide. Recombinase polymerase amplification (RPA), as an isothermal gene amplification technique, has been explored for the molecular detection of diverse pathogens. METHODS: A real-time reverse transcription RPA (RT-RPA) assay for the detection of canine distemper virus (CDV) using primers and exo probe targeting the CDV nucleocapsid protein gene was developed...
August 15, 2017: BMC Veterinary Research
https://www.readbyqxmd.com/read/28807294/recombinase-polymerase-amplification-rpa-combined-with-lateral-flow-lf-strip-for-detection-of-toxoplasma-gondii-in-the-environment
#4
Y D Wu, M J Xu, Q Q Wang, C X Zhou, M Wang, X Q Zhu, D H Zhou
Toxoplasma gondii infects all warm-blooded vertebrates, resulting in a great threat to human health and significant economic loss to the livestock industry. Ingestion of infectious oocysts of T. gondii from the environment is the major source of transmission. Detection of T. gondii oocysts by existing methods is laborious, time-consuming and expensive. The objective of the present study was to develop a recombinase polymerase amplification (RPA) method combined with a lateral flow (LF) strip for detection of T...
August 30, 2017: Veterinary Parasitology
https://www.readbyqxmd.com/read/28766343/isothermal-point-mutation-detection-toward-a-first-pass-screening-strategy-for-multidrug-resistant-tuberculosis
#5
Benjamin Y C Ng, Eugene J H Wee, Kyra Woods, Will Anderson, Fiach Antaw, Hennes Z H Tsang, Nicholas P West, Matt Trau
Point mutations in DNA are useful biomarkers that can provide critical classification of disease for accurate diagnosis and to inform clinical decisions. Conventional approaches to detect point mutations are usually based on technologies such as real-time polymerase chain reaction (PCR) or DNA sequencing, which are typically slow and require expensive lab-based equipment. While rapid isothermal strategies such as recombinase polymerase amplification (RPA) have been proposed, they tend to suffer from poor specificity in discriminating point mutations...
August 15, 2017: Analytical Chemistry
https://www.readbyqxmd.com/read/28766245/elevated-expression-of-rpa3-is-involved-in-gastric-cancer-tumorigenesis-and-associated-with-poor-patient-survival
#6
Zhongming Dai, Shufang Wang, Weiping Zhang, Yunsheng Yang
BACKGROUND: The replication protein A3 (RPA3) is a component of the RPA protein complex, which plays an essential role in multiple processes of DNA metabolism. AIMS: However, the involvement of RPA3 in gastric cancer tumorigenesis has not yet been investigated. METHODS: We stably knocked down RPA3 expression using short hairpin RNA in AGS cell line, and performed cell growth, colony formation and soft agar assays. Xenograft experiments were performed to examine tumor promoting properties of RPA3 in vivo...
August 1, 2017: Digestive Diseases and Sciences
https://www.readbyqxmd.com/read/28764803/a-novel-rlbp1-gene-geographical-area-related-mutation-present-in-a-young-patient-with-retinitis-punctata-albescens
#7
Concetta Scimone, Luigi Donato, Teresa Esposito, Carmela Rinaldi, Rosalia D'Angelo, Antonina Sidoti
BACKGROUND: Autosomal recessive forms of retinitis punctata albescens (RPA) have been described. RPA is characterized by progressive retinal degeneration due to alteration in visual cycle and consequent deposit of photopigments in retinal pigment epithelium. Five loci have been linked to RPA onset. Among these, the retinaldehyde-binding protein 1 gene, RLBP1, is the most frequently involved and several founder mutations were reported. We report results of a genetic molecular investigation performed on a large Sicilian family in which appears a young woman with RPA...
August 1, 2017: Human Genomics
https://www.readbyqxmd.com/read/28757209/smarcal1-mediated-fork-reversal-triggers-mre11-dependent-degradation-of-nascent-dna-in-the-absence-of-brca2-and-stable-rad51-nucleofilaments
#8
Arun Mouli Kolinjivadi, Vincenzo Sannino, Anna De Antoni, Karina Zadorozhny, Mairi Kilkenny, Hervé Técher, Giorgio Baldi, Rong Shen, Alberto Ciccia, Luca Pellegrini, Lumir Krejci, Vincenzo Costanzo
Brca2 deficiency causes Mre11-dependent degradation of nascent DNA at stalled forks, leading to cell lethality. To understand the molecular mechanisms underlying this process, we isolated Xenopus laevis Brca2. We demonstrated that Brca2 protein prevents single-stranded DNA gap accumulation at replication fork junctions and behind them by promoting Rad51 binding to replicating DNA. Without Brca2, forks with persistent gaps are converted by Smarcal1 into reversed forks, triggering extensive Mre11-dependent nascent DNA degradation...
July 20, 2017: Molecular Cell
https://www.readbyqxmd.com/read/28753691/experimental-study-of-anisotropic-stress-strain-relationships-of-aortic-and-pulmonary-artery-homografts-and-synthetic-vascular-grafts
#9
Yueqian Jia, Yangyang Qiao, I Ricardo Argueta-Morales, Aung Maung, Jack Norfleet, Yuanli Bai, Eduardo Divo, Alain J Kassab, William M DeCampli
Homografts and synthetic grafts are used in surgery for congenital heart disease (CHD). Determining these materials' mechanical properties will aid in understanding tissue behavior when subjected to abnormal CHD hemodynamics. Homograft tissue samples from anterior/posterior aspects, of ascending/descending aorta (AA, DA), innominate artery (IA), left subclavian artery (LScA), left common carotid artery (LCCA), main/left/right pulmonary artery (MPA, LPA, RPA), and synthetic vascular grafts, were obtained in three orientations: circumferential, diagonal (45 deg relative to circumferential direction), and longitudinal...
October 1, 2017: Journal of Biomechanical Engineering
https://www.readbyqxmd.com/read/28752402/equipping-the-8th-edition-american-joint-committee-on-cancer-staging-for-gastric-cancer-with-the-15-node-minimum-a-population-based-study-using-recursive-partitioning-analysis
#10
Shu-Qiang Yuan, Yu-Tong Chen, Ze-Ping Huang
BAKCGROUND: The recently proposed 8th American Joint Committee on Cancer (AJCC) staging for gastric cancer (GC) did not include the evaluated lymph node (ELN) count as a prognostic indicator. In this study, we performed recursive partitioning analysis (RPA) to objectively combine the 15-ELN threshold and 8th AJCC stage to refine the staging for GC. METHODS: We analyzed 19,018 patients with non-metastatic GC from the Surveillance, Epidemiology, and End Results database...
July 27, 2017: Journal of Gastrointestinal Surgery: Official Journal of the Society for Surgery of the Alimentary Tract
https://www.readbyqxmd.com/read/28751228/consideration-of-patient-and-disease-characteristics-in-selecting-radiation-regimens-for-treatment-of-bone-metastases
#11
Yufei Liu, Rie von Eyben, Elizabeth A Kidd
PURPOSE: Radiation therapy is one of the mainstays of treatment for painful bone metastases; however, the optimal fractionation and dosing of radiation for a given patient and disease characteristics are still subject to debate. METHODS AND MATERIALS: We retrospectively examined 475 patients who received radiation for bone metastases at our institution from 2009 through 2014 and evaluated survival outcomes based on parameters of their first treatment course and patient demographics...
June 23, 2017: Practical Radiation Oncology
https://www.readbyqxmd.com/read/28746850/investigation-of-n-terminal-phospho-regulation-of%C3%A2-uracil-dna-glycosylase-using-protein-semisynthesis
#12
Brian P Weiser, James T Stivers, Philip A Cole
Uracil DNA Glycosylase (UNG2) is the primary enzyme in humans that prevents the stable incorporation of deoxyuridine monophosphate into DNA in the form of U/A basepairs. During S-phase, UNG2 remains associated with the replication fork through its interactions with two proteins, Proliferating Cell Nuclear Antigen (PCNA) and Replication Protein A (RPA), which are critical for DNA replication and repair. In this work, we used protein semisynthesis and fluorescence anisotropy assays to explore the interactions of UNG2 with PCNA and RPA and to determine the effects of two UNG2 phosphorylation sites (Thr(6) and Tyr(8)) located within its PCNA-interacting motif (PIP-box)...
July 25, 2017: Biophysical Journal
https://www.readbyqxmd.com/read/28735897/radx-promotes-genome-stability-and-modulates-chemosensitivity-by-regulating-rad51-at-replication-forks
#13
Huzefa Dungrawala, Kamakoti P Bhat, Rémy Le Meur, Walter J Chazin, Xia Ding, Shyam K Sharan, Sarah R Wessel, Aditya A Sathe, Runxiang Zhao, David Cortez
RAD51 promotes homology-directed repair (HDR), replication fork reversal, and stalled fork protection. Defects in these functions cause genomic instability and tumorigenesis but also generate hypersensitivity to cancer therapeutics. Here we describe the identification of RADX as an RPA-like, single-strand DNA binding protein. RADX is recruited to replication forks, where it prevents fork collapse by regulating RAD51. When RADX is inactivated, excessive RAD51 activity slows replication elongation and causes double-strand breaks...
August 3, 2017: Molecular Cell
https://www.readbyqxmd.com/read/28734294/the-standard-mean-field-treatment-of-inter-particle-attraction-in-classical-dft-is-better-than-one-might-expect
#14
Andrew J Archer, Blesson Chacko, Robert Evans
In classical density functional theory (DFT), the part of the Helmholtz free energy functional arising from attractive inter-particle interactions is often treated in a mean-field or van der Waals approximation. On the face of it, this is a somewhat crude treatment as the resulting functional generates the simple random phase approximation (RPA) for the bulk fluid pair direct correlation function. We explain why using standard mean-field DFT to describe inhomogeneous fluid structure and thermodynamics is more accurate than one might expect based on this observation...
July 21, 2017: Journal of Chemical Physics
https://www.readbyqxmd.com/read/28733053/dose-volume-correlates-of-mandibular-osteoradionecrosis-in-oropharynx-cancer-patients-receiving-intensity-modulated-radiotherapy-results-from-a-case-matched-comparison
#15
(no author information available yet)
PURPOSE: To determine dosimetric parameters associated with osteoradionecrosis (ORN) in oropharyngeal cancer (OPC) patients in the IMRT era. MATERIAL AND METHODS: Subsequent to institutional review board approval, we identified ORN in OPC patients treated with IMRT from 2002 to 2013. 1:2 case-control matching was implemented. Mandibular dose-volume histograms (DVH) were extracted. Dosimetric parameters were compared using non-parametric stats. Recursive partitioning analysis (RPA) was done to identify DVH correlates of ORN...
July 18, 2017: Radiotherapy and Oncology: Journal of the European Society for Therapeutic Radiology and Oncology
https://www.readbyqxmd.com/read/28730733/the-potential-impact-of-radix-paeoniae-alba-in-embryonic-development-of-mice
#16
Wei Xu, Ling Xu, Bin Deng, Jing Leng, Nong Tang, Li Chun Zhao, Hong Hai Zhou, Zhong Zhen Zhao, Zhi Jun Yang, Ting Ting Xiao, Xiao Ying Tian, Alan H M Ho, Nickie W K Chan, Yeuk Lung Chow, Chi Yi Chow, Min Xu
Although Radix Paeoniae Alba (RPA) has been ranked as one of the top 6 herbs used frequently to prevent and treat miscarriages clinically, there is no clear evidence regarding its safety in embryonic development. This study aims to evaluate the potential impacts of RPA on embryonic stem cells (ESCs) and pregnant mice. Cytotoxicity assays of the extract were performed in ESCs and 3T3 cells. Pregnant ICR mice were orally treated with RPA extracts at dosages of 0 (G1 group as negative controls), 2, 8 and 32 g/kg/day (G2, G3 and G4 groups) respectively from the gestation day (Gd) 6-15...
July 21, 2017: Phytotherapy Research: PTR
https://www.readbyqxmd.com/read/28727514/similarity-in-romantic-couples-drinking-motivations-and-drinking-behaviours
#17
Ivy-Lee L Kehayes, Sean P Mackinnon, Simon B Sherry, Kenneth E Leonard, Sherry H Stewart
BACKGROUND: Research suggests enhancement, conformity, social, coping-with-anxiety, and coping-with-depression drinking motives are linked to specific drinking outcomes in a theoretically-expected manner. Social learning theory suggests people who spend more time together emulate each other's behaviour to acquire reinforcing outcomes. The present study sought to integrate drinking motives theory and social learning theory to investigate similarity in drinking behaviours and drinking motives in romantic couples...
July 20, 2017: Substance Abuse
https://www.readbyqxmd.com/read/28726394/human-cst-prefers-g-rich-but-not-necessarily-telomeric-sequences
#18
Robert A Hom, Deborah S Wuttke
The human CST (CTC1-STN1-TEN1) heterotrimeric complex plays roles in both telomere maintenance and DNA replication through its ability to interact with single-stranded DNA (ssDNA) of a variety of sequences. The precise sequence specificity required to execute these functions is unknown. Telomere-binding proteins have been shown to specifically recognize key telomeric sequence motifs within ssDNA while accommodating nonspecifically recognized sequences through conformationally plastic interfaces. To better understand the role CST plays in these processes, we have produced a highly purified heterotrimer and elucidated the sequence requirements for CST recognition of ssDNA in vitro...
August 15, 2017: Biochemistry
https://www.readbyqxmd.com/read/28726173/recurrent-glioblastomas-in-the-elderly-after-maximal-first-line-treatment-does-preserved-overall-condition-warrant-a-maximal-second-line-treatment
#19
Marc Zanello, Alexandre Roux, Renata Ursu, Sophie Peeters, Luc Bauchet, Georges Noel, Jacques Guyotat, Pierre-Jean Le Reste, Thierry Faillot, Fabien Litre, Nicolas Desse, Evelyne Emery, Antoine Petit, Johann Peltier, Jimmy Voirin, François Caire, Jean-Luc Barat, Jean-Rodolphe Vignes, Philippe Menei, Olivier Langlois, Edouard Dezamis, Antoine Carpentier, Phong Dam Hieu, Philippe Metellus, Johan Pallud
A growing literature supports maximal safe resection followed by standard combined chemoradiotherapy (i.e. maximal first-line therapy) for selected elderly glioblastoma patients. To assess the prognostic factors from recurrence in elderly glioblastoma patients treated by maximal safe resection followed by standard combined chemoradiotherapy as first-line therapy. Multicentric retrospective analysis comparing the prognosis and optimal oncological management of recurrent glioblastomas between 660 adult patients aged of < 70 years (standard group) and 117 patients aged of ≥70 years (elderly group) harboring a supratentorial glioblastoma treated by maximal first-line therapy...
July 19, 2017: Journal of Neuro-oncology
https://www.readbyqxmd.com/read/28718810/dna2-an-important-player-in-dna-damage-response-or-just-another-dna-maintenance-protein
#20
REVIEW
Elzbieta Pawłowska, Joanna Szczepanska, Janusz Blasiak
The human DNA2 (DNA replication helicase/nuclease 2) protein is expressed in both the nucleus and mitochondria, where it displays ATPase-dependent nuclease and helicase activities. DNA2 plays an important role in the removing of long flaps in DNA replication and long-patch base excision repair (LP-BER), interacting with the replication protein A (RPA) and the flap endonuclease 1 (FEN1). DNA2 can promote the restart of arrested replication fork along with Werner syndrome ATP-dependent helicase (WRN) and Bloom syndrome protein (BLM)...
July 18, 2017: International Journal of Molecular Sciences
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