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https://www.readbyqxmd.com/read/28096402/establishment-of-expression-state-boundaries-by-rif1-and-taz1-in-fission-yeast
#1
Tea Toteva, Bethany Mason, Yutaka Kanoh, Peter Brøgger, Daniel Green, Janne Verhein-Hansen, Hisao Masai, Geneviève Thon
The Shelterin component Rif1 has emerged as a global regulator of the replication-timing program in all eukaryotes examined to date, possibly by modulating the 3D-organization of the genome. In fission yeast a second Shelterin component, Taz1, might share similar functions. Here, we identified unexpected properties for Rif1 and Taz1 by conducting high-throughput genetic screens designed to identify cis- and trans-acting factors capable of creating heterochromatin-euchromatin boundaries in fission yeast. The preponderance of cis-acting elements identified in the screens originated from genomic loci bound by Taz1 and associated with origins of replication whose firing is repressed by Taz1 and Rif1...
January 17, 2017: Proceedings of the National Academy of Sciences of the United States of America
https://www.readbyqxmd.com/read/28081453/intertypic-recombination-of-human-parechovirus-4-isolated-from-infants-with-sepsis-like-disease
#2
Pekka Kolehmainen, Anu Siponen, Teemu Smura, Hannimari Kallio-Kokko, Olli Vapalahti, Anne Jääskeläinen, Sisko Tauriainen
BACKGROUND: Human parechoviruses (HPeVs) (family Picornaviridae), are common pathogens in young children. Despite their high prevalence, research on their genetic identity, diversity and evolution have remained scarce. OBJECTIVES: Complete coding regions of three previously reported HPeV-4 isolates from Finnish children with sepsis-like disease were sequenced in order to elucidate the phylogenetic relationships and potential recombination events during the evolution of these isolates...
January 3, 2017: Journal of Clinical Virology: the Official Publication of the Pan American Society for Clinical Virology
https://www.readbyqxmd.com/read/28070687/predicting-chromatin-architecture-from-models-of-polymer-physics
#3
REVIEW
Simona Bianco, Andrea M Chiariello, Carlo Annunziatella, Andrea Esposito, Mario Nicodemi
We review the picture of chromatin large-scale 3D organization emerging from the analysis of Hi-C data and polymer modeling. In higher mammals, Hi-C contact maps reveal a complex higher-order organization, extending from the sub-Mb to chromosomal scales, hierarchically folded in a structure of domains-within-domains (metaTADs). The domain folding hierarchy is partially conserved throughout differentiation, and deeply correlated to epigenomic features. Rearrangements in the metaTAD topology relate to gene expression modifications: in particular, in neuronal differentiation models, topologically associated domains (TADs) tend to have coherent expression changes within architecturally conserved metaTAD niches...
January 9, 2017: Chromosome Research
https://www.readbyqxmd.com/read/28064306/-dna-tandem-lesion-5-8-cyclo-2-deoxyadenosine-the-influence-on-human-health
#4
A Merecz, B T Karwowski
Nucleic acids are the targets for various endogenous and exogenous genotoxic agents, including reactive oxygen species. The appearance of a hydroxyl racial (^(<b>.</b>)OH), the most harmful molecule, next to an oligonucleotide can lead to two types of DNA damage: strand breaks or nucleobase modifications. Since clustered DNA damage is defined as the presence of two or more lesions in one helix turn, purine 5',8-cyclo-2'-deoxynucleosides are recognized as tandem lesions: both sugar moieties and base have been modified within one nucleoside/nucleotide...
November 2016: Molekuliarnaia Biologiia
https://www.readbyqxmd.com/read/28049722/the-linc-complex-contributes-to-heterochromatin-organisation-and-transcriptional-gene-silencing-in-plants
#5
Axel Poulet, Céline Duc, Maxime Voisin, Sophie Desset, Sylvie Tutois, Emmanuel Vanrobays, Matthias Benoit, David E Evans, Aline V Probst, Christophe Tatout
The LInker of Nucleoskeleton and Cytoskeleton (LINC) complex is an evolutionary well-conserved protein bridge connecting the cytoplasmic and nuclear compartments across the nuclear membrane. While recent data support its function in nuclear morphology and meiosis, its implication in chromatin organisation has not been studied in plants. Here 3D imaging methods have been used to investigate nuclear morphology and chromatin organisation in interphase nuclei of the model plant Arabidopsis thaliana, in which heterochromatin cluster in conspicuous chromatin domains called chromocentres...
January 3, 2017: Journal of Cell Science
https://www.readbyqxmd.com/read/28049701/three-dimensional-genome-organization-and-function-in-drosophila
#6
Yuri B Schwartz, Giacomo Cavalli
Understanding how the metazoan genome is used during development and cell differentiation is one of the major challenges in the postgenomic era. Early studies in Drosophila suggested that three-dimensional (3D) chromosome organization plays important regulatory roles in this process and recent technological advances started to reveal connections at the molecular level. Here we will consider general features of the architectural organization of the Drosophila genome, providing historical perspective and insights from recent work...
January 2017: Genetics
https://www.readbyqxmd.com/read/28046940/su-f-r-03-classification-of-glioblastoma-multiforme-molecular-subtypes-using-three-dimensional-multi-modal-mr-imaging-features
#7
M Mulvey, S Muhyadeen, U Sinha
PURPOSE: Positive patient outcomes with the use of aggressive concurrent chemoradiotherapy have been shown for classical and mesenchymal glioblastoma multiformae (GBM) subtypes, while not having the same positive effect for patients with neural and proneural subtypes. Quantitative MR Imaging features from multimodal MRI have been recently explored for GBM subtype classification with some promising results. We have integrated 3D textural and moment invariant features to investigate if these will strengthen the association between glioblastoma MR image features and genomic markers...
June 2016: Medical Physics
https://www.readbyqxmd.com/read/28045568/tissue-specific-nets-alter-genome-organization-and-regulation-even-in-a-heterologous-system
#8
Jose I de Las Heras, Nikolaj Zuleger, Dzmitry G Batrakou, Rafal Czapiewski, Alastair R W Kerr, Eric C Schirmer
Different cell types exhibit distinct patterns of 3D genome organization that correlate with changes in gene expression in tissue and differentiation systems. Several tissue-specific nuclear envelope transmembrane proteins (NETs) have been found to influence the spatial positioning of genes and chromosomes that normally occurs during tissue differentiation. Here we study 3 such NETs: NET29, NET39, and NET47, which are expressed preferentially in fat, muscle and liver, respectively. We found that even when exogenously expressed in a heterologous system they can specify particular genome organization patterns and alter gene expression...
January 3, 2017: Nucleus
https://www.readbyqxmd.com/read/28043417/in-silico-structure-analysis-and-epitope-prediction-of%C3%A2-e3-cr1-beta-protein-of-human-adenovirus-e%C3%A2-for%C3%A2-vaccine-design
#9
Noman Ibna Amin Patwary, Md Saiful Islam, Md Sohel, Ismot Ara, Mohd Omar Faruk Sikder, Shah Md Shahik
BACKGROUND: Human Adenoviruses are divided into 7 species of Human Adenovirus A to G based on DNA genome homology. The Human Adenovirus E (HAdVs-E) genome is a linear, double-stranded DNA containing 38 protein-coding genes. Wild-type adenoviruses type E, are linked to a number of slight illnesses. The most important part of HAdVs-E is E3 CR1-beta protein which controls the host immune response and viral attachment. METHOD: We use numerous bio-informatics and immuno-informatics implements comprising sequence and construction tools for construction of 3D model and epitope prediction for HAdVs-E...
December 2016: Biomedical Journal
https://www.readbyqxmd.com/read/28040646/coupling-1d-modifications-and-3d-nuclear-organization-data-models-and-function
#10
REVIEW
Daniel Jost, Cédric Vaillant, Peter Meister
Over the past decade, advances in molecular methods have strikingly improved the resolution at which nuclear genome folding can be analyzed. This revealed a wealth of conserved features organizing the one dimensional DNA molecule into tridimensional nuclear domains. In this review, we briefly summarize the main findings and highlight how models based on polymer physics shed light on the principles underlying the formation of these domains. Finally, we discuss the mechanistic similarities allowing self-organization of these structures and the functional importance of these in the maintenance of transcriptional programs...
December 29, 2016: Current Opinion in Cell Biology
https://www.readbyqxmd.com/read/28027298/inferential-structure-determination-of-chromosomes-from-single-cell-hi-c-data
#11
Simeon Carstens, Michael Nilges, Michael Habeck
Chromosome conformation capture (3C) techniques have revealed many fascinating insights into the spatial organization of genomes. 3C methods typically provide information about chromosomal contacts in a large population of cells, which makes it difficult to draw conclusions about the three-dimensional organization of genomes in individual cells. Recently it became possible to study single cells with Hi-C, a genome-wide 3C variant, demonstrating a high cell-to-cell variability of genome organization. In principle, restraint-based modeling should allow us to infer the 3D structure of chromosomes from single-cell contact data, but suffers from the sparsity and low resolution of chromosomal contacts...
December 2016: PLoS Computational Biology
https://www.readbyqxmd.com/read/28024527/in-silico-prediction-of-dual-function-of-dksa-like-hypothetical-protein-in-v-cholerae-o395-genome
#12
Avirup Dutta, Atul Katarkar, Keya Chaudhuri
Cholera, an acute infection of the small intestine, is caused by Vibrio cholerae. The present study identified a hypothetical protein in V. cholerae O395, which was predicted to be acquired through horizontal gene transfer the origin of which was found to be from a phage. Its expression was further confirmed by RT-PCR. Homology based 3D model of the hypothetical protein indicated DksA like homologue. Protein binding site of 3D-model revealed a deep cleft which may influence the dimer formation and interaction with ds-DNA molecule...
January 2017: Microbiological Research
https://www.readbyqxmd.com/read/28013411/genomic-effects-of-glucocorticoids
#13
REVIEW
Ivana Grbesa, Ofir Hakim
Glucocorticoids and their receptor (GR) have been an important area of research because of their pleiotropic physiological functions and extensive use in the clinic. In addition, the association between GR and glucocorticoids, which is highly specific, leads to rapid nuclear translocation where GR associates with chromatin to regulate gene transcription. This simplified model system has been instrumental for studying the complexity of transcription regulation processes occurring at chromatin. In this review we discuss our current understanding of GR action that has been enhanced by recent developments in genome wide measurements of chromatin accessibility, histone marks, chromatin remodeling and 3D chromatin structure in various cell types responding to glucocorticoids...
December 24, 2016: Protoplasma
https://www.readbyqxmd.com/read/28012137/vapros-a-database-integration-approach-for-protein-genome-information-retrieval
#14
Takashi Gojobori, Kazuho Ikeo, Yukie Katayama, Takeshi Kawabata, Akira R Kinjo, Kengo Kinoshita, Yeondae Kwon, Ohsuke Migita, Hisashi Mizutani, Masafumi Muraoka, Koji Nagata, Satoshi Omori, Hideaki Sugawara, Daichi Yamada, Kei Yura
Life science research now heavily relies on all sorts of databases for genome sequences, transcription, protein three-dimensional (3D) structures, protein-protein interactions, phenotypes and so forth. The knowledge accumulated by all the omics research is so vast that a computer-aided search of data is now a prerequisite for starting a new study. In addition, a combinatory search throughout these databases has a chance to extract new ideas and new hypotheses that can be examined by wet-lab experiments. By virtually integrating the related databases on the Internet, we have built a new web application that facilitates life science researchers for retrieving experts' knowledge stored in the databases and for building a new hypothesis of the research target...
December 23, 2016: Journal of Structural and Functional Genomics
https://www.readbyqxmd.com/read/28008337/statistical-challenges-in-analyzing-methylation-and-long-range-chromosomal-interaction-data
#15
Zhaohui Qin, Ben Li, Karen N Conneely, Hao Wu, Ming Hu, Deepak Ayyala, Yongseok Park, Victor X Jin, Fangyuan Zhang, Han Zhang, Li Li, Shili Lin
With the rapid development of high throughput technologies such as array and next generation sequencing (NGS), genome-wide, nucleotide-resolution epigenomic data are increasingly available. In recent years, there has been particular interest in data on DNA methylation and 3-dimensional (3D) chromosomal organization, which are believed to hold keys to understand biological mechanisms, such as transcription regulation, that are closely linked to human health and diseases. However, small sample size, complicated correlation structure, substantial noise, biases, and uncertainties, all present difficulties for performing statistical inference...
October 2016: Statistics in Biosciences
https://www.readbyqxmd.com/read/27996096/super-resolution-structure-of-dna-significantly-differs-in-buccal-cells-of-controls-and-alzheimer-s-patients
#16
Angeles Garcia, David Huang, Amanda Righolt, Christiaan Righolt, Maria Carmela Kalaw, Shubha Mathur, Elizabeth McAvoy, James Anderson, Angela Luedke, Justine Itorralba, Sabine Mai
The advent of super-resolution microscopy allowed for new insights into cellular and physiological processes of normal and diseased cells. In this study, we report for the first time on the super-resolved DNA structure of buccal cells from patients with Alzheimer's disease (AD) vs. age- and gender-matched healthy, non-caregiver controls. In this super-resolution study cohort of 74 participants, buccal cells were collected and their spatial DNA organization in the nucleus examined by 3D Structured Illumination Microscopy (3D-SIM)...
December 20, 2016: Journal of Cellular Physiology
https://www.readbyqxmd.com/read/27994192/mapping-of-stripe-rust-resistance-gene-in-an-aegilops-caudate-introgression-line-in-wheat-and-its-genetic-association-with-leaf-rust-resistance
#17
Puneet Inder Toor, Satinder Kaur, Mitaly Bansal, Bharat Yadav, Parveen Chhuneja
A pair of stripe rust and leaf rust resistance genes was introgressed from Aegilops caudata, a nonprogenitor diploid species with the CC genome, to cultivated wheat. Inheritance and genetic mapping of stripe rust resistance gene in backcrossrecombinant inbred line (BC-RIL) population derived from the cross of a wheat-Ae. caudata introgression line (IL) T291- 2(pau16060) with wheat cv. PBW343 is reported here. Segregation of BC-RILs for stripe rust resistance depicted a single major gene conditioning adult plant resistance (APR) with stripe rust reaction varying from TR-20MS in resistant RILs signifying the presence of some minor genes as well...
December 2016: Journal of Genetics
https://www.readbyqxmd.com/read/27984824/arcphdb-a-comprehensive-protein-database-for-sf1-and-sf2-helicase-from-archaea
#18
Mirna Moukhtar, Wafi Chaar, Ziad Abdel-Razzak, Mohamad Khalil, Samir Taha, Hala Chamieh
PURPOSE: Superfamily 1 and Superfamily 2 helicases, two of the largest helicase protein families, play vital roles in many biological processes including replication, transcription and translation. Study of helicase proteins in the model microorganisms of archaea have largely contributed to the understanding of their function, architecture and assembly. Based on a large phylogenomics approach, we have identified and classified all SF1 and SF2 protein families in ninety five sequenced archaea genomes...
December 6, 2016: Computers in Biology and Medicine
https://www.readbyqxmd.com/read/27984731/single-molecule-real-time-3d-imaging-of-the-transcription-cycle-by-modulation-interferometry
#19
Guanshi Wang, Jesse Hauver, Zachary Thomas, Seth A Darst, Alexandros Pertsinidis
Many essential cellular processes, such as gene control, employ elaborate mechanisms involving the coordination of large, multi-component molecular assemblies. Few structural biology tools presently have the combined spatial-temporal resolution and molecular specificity required to capture the movement, conformational changes, and subunit association-dissociation kinetics, three fundamental elements of how such intricate molecular machines work. Here, we report a 3D single-molecule super-resolution imaging study using modulation interferometry and phase-sensitive detection that achieves <2 nm axial localization precision, well below the few-nanometer-sized individual protein components...
December 15, 2016: Cell
https://www.readbyqxmd.com/read/27983837/prediction-of-protein-kinase-ligand-interactions-through-2-5d-kinochemometrics
#20
Nicolas Bosc, Berthold Wroblowski, Christophe Meyer, Pascal Bonnet
So far, 518 protein kinases have been identified in the human genome. They share a common mechanism of protein phosphorylation and are involved in many critical biological processes of eukaryotic cells. Deregulation of the kinase phosphorylation function induces severe illnesses such as cancer, diabetes, or inflammatory diseases. Many actors in the pharmaceutical domain have made significant efforts to design potent and selective protein kinase inhibitors as new potential drugs. Because the ATP binding site is highly conserved in the protein kinase family, the design of selective inhibitors remains a challenge and has negatively impacted the progression of drug candidates to late-stage clinical development...
January 3, 2017: Journal of Chemical Information and Modeling
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