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https://www.readbyqxmd.com/read/28322723/nucleosomes-influence-multiple-steps-during-replication-initiation
#1
Ishara F Azmi, Shinya Watanabe, Michael F Maloney, Sukhyun Kang, Jason A Belsky, David M MacAlpine, Craig L Peterson, Stephen P Bell
Eukaryotic replication origin licensing, activation and timing are influenced by chromatin but a mechanistic understanding is lacking. Using reconstituted nucleosomal DNA replication assays, we assessed the impact of nucleosomes on replication initiation. To generate distinct nucleosomal landscapes, different chromatin-remodeling enzymes (CREs) were used to remodel nucleosomes on origin-DNA templates. Nucleosomal organization influenced two steps of replication initiation: origin licensing and helicase activation...
March 21, 2017: ELife
https://www.readbyqxmd.com/read/28321252/prevalence-of-anemia-among-older-adults-residing-in-the-coastal-and-andes-mountains-in-ecuador-results-of-the-sabe-survey
#2
Carlos H Orces
Objectives. To estimate the prevalence of anemia and its determinants among older adults in Ecuador. Methods. The present study was based on data from the National Survey of Health, Wellbeing, and Aging. Hemoglobin concentrations were adjusted by participants' smoking status and altitude of residence, and anemia was defined according to the World Health Organization criteria (<12 g/dL in women and <13 g/dL in men). Gender-specific logistic regression models were used to examine the association between demographic and health characteristics and anemia...
2017: Current Gerontology and Geriatrics Research
https://www.readbyqxmd.com/read/28256704/a-comprehensive-guide-to-perioperative-management-and-operative-technique-for-robotic-cystectomy-with-intracorporeal-urinary-diversion
#3
Wei Shen Tan, Benjamin W Lamb, Ashwin Sridhar, Timothy P Briggs, John D Kelly
Robotic-assisted radical cystectomy (RARC) represents an evolution of open radical cystectomy (ORC) with the aim of reducing patient morbidity and improving return to normal function, whilst maintaining oncological equivalence. RARC is gaining popularity, especially in high-volume centres, although there remains a lack of level 1 evidence to demonstrate any superiority of RARC over ORC. All previously reported studies that randomised ORC and RARC have utilised a technique for RARC requiring a conversion to open surgery for urinary diversion...
February 27, 2017: Urologia
https://www.readbyqxmd.com/read/28252989/predicting-and-priming-thematic-roles-flexible-use-of-verbal-and-nonverbal-cues-during-relative-clause-comprehension
#4
Alix Kowalski, Yi Ting Huang
Relative-clause sentences (RCs) have been a key test case for psycholinguistic models of comprehension. While object-relative clauses (e.g., ORCs: "The bear that the horse . . .") are distinguished from subject-relative clauses (SRCs) after the second noun phrase (NP2; e.g., SRCs: "The bear that pushed . . ."), role assignments are often delayed until the embedded verb (e.g., ". . . pushed ate the sandwich"). This contrasts with overwhelming evidence of incremental role assignment in other garden-path sentences...
March 2, 2017: Journal of Experimental Psychology. Learning, Memory, and Cognition
https://www.readbyqxmd.com/read/28247176/detection-of-significant-pneumococcal-meningitis-biomarkers-by-ego-network
#5
Qian Wang, Zhifeng Lou, Liansuo Zhai, Haibin Zhao
OBJECTIVE: To identify significant biomarkers for detection of pneumococcal meningitis based on ego network. METHODS: Based on the gene expression data of pneumococcal meningitis and global protein-protein interactions (PPIs) data recruited from open access databases, the authors constructed a differential co-expression network (DCN) to identify pneumococcal meningitis biomarkers in a network view. Here EgoNet algorithm was employed to screen the significant ego networks that could accurately distinguish pneumococcal meningitis from healthy controls, by sequentially seeking ego genes, searching candidate ego networks, refinement of candidate ego networks and significance analysis to identify ego networks...
March 1, 2017: Indian Journal of Pediatrics
https://www.readbyqxmd.com/read/28236141/effects-of-age-and-location-in-chinese-relative-clauses-processing
#6
Wenguang He, Na Xu, Runqing Ji
Three experiments investigated Chinese relative clause processing with children, youths and elders using sentence-picture matching and self-paced reading methods. In Experiment 1, we found that object-extracted clause were easier to comprehend than subject-extracted clause , and object-modified relative clause (i.e., object-modified subject-extracted clause[Formula: see text]object-modified object-extracted clause) were difficult to comprehend than subject modified relative clause (subject-modified subject-extracted clause[Formula: see text]subject-modified object-extracted clause)...
February 24, 2017: Journal of Psycholinguistic Research
https://www.readbyqxmd.com/read/28235841/non-coding-y-rnas-associate-with-early-replicating-euchromatin-concordantly-with-the-origin-recognition-complex-orc
#7
Eyemen G A Kheir, Torsten Krude
Non-coding Y RNAs are essential for the initiation of chromosomal DNA replication in vertebrates, yet their association with chromatin during the cell cycle is not characterised. Here, we quantify human Y RNA levels in soluble and chromatin-associated intracellular fractions and investigate topographically their dynamic association with chromatin during the cell cycle. We find that, on average, about a million Y RNA molecules are present in the soluble fraction of a proliferating cell, and 5-10-fold less in association with chromatin...
February 24, 2017: Journal of Cell Science
https://www.readbyqxmd.com/read/28223353/sap1-is-a-replication-initiation-factor-essential-for-the-assembly-of-pre-replicative-complex-in-the-fission-yeast-schizosaccharomyces-pombe
#8
Ling Guan, Peng He, Fang Yang, Yuan Zhang, Yunfei Hu, Jienv Ding, Yu Hua, Yi Zhang, Qiong Ye, Jiazhi Hu, Tao Wang, Changwen Jin, Daochun Kong
A central step in the initiation of chromosomal DNA replication in eukaryotes is the assembly of pre-replicative complex (pre-RC) at late M and early G1 phase of the cell cycles. Since 1973, four proteins or protein complexes, including cell division control protein 6 (Cdc6)/Cdc18, minichromosome maintenance protein complex (MCM), origin recognition complex (ORC), and Cdt1, are known components of the pre-RC. Previously, we reported that a non-ORC protein binds to the essential element delta 9 of the Schizosaccharomyces pombe DNA replication origin ARS3001...
February 21, 2017: Journal of Biological Chemistry
https://www.readbyqxmd.com/read/28212251/serum-mast-cell-tryptase-as-a-marker-of-posttraumatic-joint-contracture-in-a-rabbit-model
#9
Michaela Kopka, Michael J Monument, A Dean Befus, Mei Zhang, David A Hart, Paul T Salo, Prism S Schneider, Cun-Yi Fan, Xiangdang Liang, Alexandra Garven, Kevin A Hildebrand
OBJECTIVES: Mast cells have been identified as key mediators of posttraumatic joint contracture, and stabilizing medications (ketotifen) have been shown to decrease contracture severity. Serum mast cell tryptase (SMCT) levels are used clinically to monitor mast cell-mediated conditions. The goals of this study were to determine if SMCT levels are elevated in the setting of joint contracture, if they can be decreased in association with ketotifen therapy, and if they correlate with contracture severity...
March 2017: Journal of Orthopaedic Trauma
https://www.readbyqxmd.com/read/28191894/open-ringed-structure-of-the-cdt1-mcm2-7-complex-as-a-precursor-of-the-mcm-double-hexamer
#10
Yuanliang Zhai, Erchao Cheng, Hao Wu, Ningning Li, Philip Yuk Kwong Yung, Ning Gao, Bik-Kwoon Tye
The minichromosome maintenance complex (MCM) hexameric complex (Mcm2-7) forms the core of the eukaryotic replicative helicase. During G1 phase, two Cdt1-Mcm2-7 heptamers are loaded onto each replication origin by the origin-recognition complex (ORC) and Cdc6 to form an inactive MCM double hexamer (DH), but the detailed loading mechanism remains unclear. Here we examine the structures of the yeast MCM hexamer and Cdt1-MCM heptamer from Saccharomyces cerevisiae. Both complexes form left-handed coil structures with a 10-15-Å gap between Mcm5 and Mcm2, and a central channel that is occluded by the C-terminal domain winged-helix motif of Mcm5...
February 13, 2017: Nature Structural & Molecular Biology
https://www.readbyqxmd.com/read/28191893/structural-basis-of-mcm2-7-replicative-helicase-loading-by-orc-cdc6-and-cdt1
#11
Zuanning Yuan, Alberto Riera, Lin Bai, Jingchuan Sun, Saikat Nandi, Christos Spanos, Zhuo Angel Chen, Marta Barbon, Juri Rappsilber, Bruce Stillman, Christian Speck, Huilin Li
To initiate DNA replication, the origin recognition complex (ORC) and Cdc6 load an Mcm2-7 double hexamer onto DNA. Without ATP hydrolysis, ORC-Cdc6 recruits one Cdt1-bound Mcm2-7 hexamer, thus forming an ORC-Cdc6-Cdt1-Mcm2-7 (OCCM) helicase-loading intermediate. Here we report a 3.9-Å structure of Saccharomyces cerevisiae OCCM on DNA. Flexible Mcm2-7 winged-helix domains (WHDs) engage ORC-Cdc6. A three-domain Cdt1 configuration embraces Mcm2, Mcm4, and Mcm6, thus comprising nearly half of the hexamer. The Cdt1 C-terminal domain extends to the Mcm6 WHD, which binds the Orc4 WHD...
February 13, 2017: Nature Structural & Molecular Biology
https://www.readbyqxmd.com/read/28191892/mechanism-and-timing-of-mcm2-7-ring-closure-during-dna-replication-origin-licensing
#12
Simina Ticau, Larry J Friedman, Kanokwan Champasa, Ivan R Corrêa, Jeff Gelles, Stephen P Bell
The opening and closing of two ring-shaped Mcm2-7 DNA helicases is necessary to license eukaryotic origins of replication, although the mechanisms controlling these events are unclear. The origin-recognition complex (ORC), Cdc6 and Cdt1 facilitate this process by establishing a topological link between each Mcm2-7 hexamer and origin DNA. Using colocalization single-molecule spectroscopy and single-molecule Förster resonance energy transfer (FRET), we monitored ring opening and closing of Saccharomyces cerevisiae Mcm2-7 during origin licensing...
March 2017: Nature Structural & Molecular Biology
https://www.readbyqxmd.com/read/28166228/rapid-turnover-of-dnaa-at-replication-origin-regions-contributes-to-initiation-control-of-dna-replication
#13
Katrin Schenk, Ana B Hervás, Thomas C Rösch, Marc Eisemann, Bernhard A Schmitt, Stephan Dahlke, Luise Kleine-Borgmann, Seán M Murray, Peter L Graumann
DnaA is a conserved key regulator of replication initiation in bacteria, and is homologous to ORC proteins in archaea and in eukaryotic cells. The ATPase binds to several high affinity binding sites at the origin region and upon an unknown molecular trigger, spreads to several adjacent sites, inducing the formation of a helical super structure leading to initiation of replication. Using FRAP analysis of a functional YFP-DnaA allele in Bacillus subtilis, we show that DnaA is bound to oriC with a half-time of 2...
February 2017: PLoS Genetics
https://www.readbyqxmd.com/read/28155188/inducible-expression-of-bs2-r-gene-from-capsicum-chacoense-in-sweet-orange-citrus-sinensis-l-osbeck-confers-enhanced-resistance-to-citrus-canker-disease
#14
Lorena Noelia Sendín, Ingrid Georgina Orce, Rocío Liliana Gómez, Ramón Enrique, Carlos Froilán Grellet Bournonville, Aldo Sergio Noguera, Adrián Alberto Vojnov, María Rosa Marano, Atilio Pedro Castagnaro, María Paula Filippone
Transgenic expression of the pepper Bs2 gene confers resistance to Xanthomonas campestris pv. vesicatoria (Xcv) pathogenic strains which contain the avrBs2 avirulence gene in susceptible pepper and tomato varieties. The avrBs2 gene is highly conserved among members of the Xanthomonas genus, and the avrBs2 of Xcv shares 96% homology with the avrBs2 of Xanthomonas citri subsp. citri (Xcc), the causal agent of citrus canker disease. A previous study showed that the transient expression of pepper Bs2 in lemon leaves reduced canker formation and induced plant defence mechanisms...
February 2, 2017: Plant Molecular Biology
https://www.readbyqxmd.com/read/28143590/the-most-important-questions-in-cancer-research-and-clinical-oncology-question-2-5-obesity-related-cancers-more-questions-than-answers
#15
EDITORIAL
Ajit Venniyoor
Obesity is recognized as the second highest risk factor for cancer. The pathogenic mechanisms underlying tobacco-related cancers are well characterized and effective programs have led to a decline in smoking and related cancers, but there is a global epidemic of obesity without a clear understanding of how obesity causes cancer. Obesity is heterogeneous, and approximately 25% of obese individuals remain healthy (metabolically healthy obese, MHO), so which fat deposition (subcutaneous versus visceral, adipose versus ectopic) is "malignant"? What is the mechanism of carcinogenesis? Is it by metabolic dysregulation or chronic inflammation? Through which chemokines/genes/signaling pathways does adipose tissue influence carcinogenesis? Can selective inhibition of these pathways uncouple obesity from cancers? Do all obesity related cancers (ORCs) share a molecular signature? Are there common (over-lapping) genetic loci that make individuals susceptible to obesity, metabolic syndrome, and cancers? Can we identify precursor lesions of ORCs and will early intervention of high risk individuals alter the natural history? It appears unlikely that the obesity epidemic will be controlled anytime soon; answers to these questions will help to reduce the adverse effect of obesity on human condition...
January 31, 2017: Chinese Journal of Cancer
https://www.readbyqxmd.com/read/28112645/structure-of-the-active-form-of-human-origin-recognition-complex-and-its-atpase-motor-module
#16
Ante Tocilj, Kin Fan On, Zuanning Yuan, Jingchuan Sun, Elad Elkayam, Huilin Li, Bruce Stillman, Leemor Joshua-Tor
Binding of the Origin Recognition Complex (ORC) to origins of replication marks the first step in the initiation of replication of the genome in all eukaryotic cells. Here, we report the structure of the active form of human ORC determined by X-ray crystallography and cryo-electron microscopy. The complex is composed of an ORC1/4/5 motor module lobe in an organization reminiscent of the DNA polymerase clamp loader complexes. A second lobe contains the ORC2/3 subunits. The complex is organized as a double-layered shallow corkscrew, with the AAA+ and AAA+-like domains forming one layer, and the winged-helix domains (WHDs) forming a top layer...
January 23, 2017: ELife
https://www.readbyqxmd.com/read/28094588/mechanisms-and-regulation-of-dna-replication-initiation-in-eukaryotes
#17
Matthew W Parker, Michael R Botchan, James M Berger
Cellular DNA replication is initiated through the action of multiprotein complexes that recognize replication start sites in the chromosome (termed origins) and facilitate duplex DNA melting within these regions. In a typical cell cycle, initiation occurs only once per origin and each round of replication is tightly coupled to cell division. To avoid aberrant origin firing and re-replication, eukaryotes tightly regulate two events in the initiation process: loading of the replicative helicase, MCM2-7, onto chromatin by the origin recognition complex (ORC), and subsequent activation of the helicase by its incorporation into a complex known as the CMG...
January 17, 2017: Critical Reviews in Biochemistry and Molecular Biology
https://www.readbyqxmd.com/read/28009613/serum-mast-cell-tryptase-as-a-marker-of-post-traumatic-joint-contracture-in-a-rabbit-model
#18
Michaela Kopka, Michael J Monument, A Dean Befus, Mei Zhang, David A Hart, Paul T Salo, Prism S Schneider, Cun-Yi Fan, Xiangdang Liang, Alexandra Garven, Kevin A Hildebrand
OBJECTIVES: Mast cells have been identified as key mediators of post-traumatic joint contracture, and stabilizing medications (Ketotifen) have been shown to decrease contracture severity. Serum mast cell tryptase (SMCT) levels are used clinically to monitor mast cell-mediated conditions. The goals of this study were to determine if SMCT levels are elevated in the setting of joint contracture, if they can be decreased in association with Ketotifen therapy, and if they correlate with contracture severity...
November 7, 2016: Journal of Orthopaedic Trauma
https://www.readbyqxmd.com/read/27974008/a-novel-native-collagen-dressing-with-advantageous-properties-to-promote-physiological-wound-healing
#19
C Wiegand, B A Buhren, E Bünemann, H Schrumpf, B Homey, R G Frykberg, F Lurie, P A Gerber
OBJECTIVE: Chronic hard-to-heal wounds generate high costs and resource use in western health systems and are the focus of intense efforts to improve healing outcomes. Here, we introduce a novel native collagen (90 %):alginate (10 %) wound dressing and compare it with the established oxidised dressings Method: Matrices were analysed by atomic force microscopy (AMF), scanning electron microscopy (SEM), and immunoelectron microscopy for collagen types I, III and V. Viability assays were performed with NIH-3T3 fibroblasts...
December 2, 2016: Journal of Wound Care
https://www.readbyqxmd.com/read/27943081/disambiguation-and-integration-in-korean-relative-clause-processing
#20
Michael Mansbridge, Sunju Park, Katsuo Tamaoka
Previous studies on Korean relative clauses (RC) show that, with respect to processing, object-extracted relative clauses (ORC) are more difficult to process at the head noun than subject-extracted relative clauses within temporarily ambiguous contexts. ORCs, however, are predicted by experience-based processing models to incur a greater processing cost during early processing stages at the RC verb, since it is a likely locus of disambiguation for RCs in Korean, and because ORCs are a less frequent structure...
December 10, 2016: Journal of Psycholinguistic Research
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