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1048 full-text articles. Page 1 of 39.

Role Of Multicellular Aggregates In Biofilm Formation, Kasper N. Kragh, Jaime B. Hutchison, Gavin Melaugh, Chris Rodesney, Aled E. L. Roberts, Yasuhiko Irie, Peter Ø. Jensen, Stephen P. Diggle, Rosalind J. Allen, Vernita Gordon, Thomas Bjarnsholt 2016 University of Copenhagen

Role Of Multicellular Aggregates In Biofilm Formation, Kasper N. Kragh, Jaime B. Hutchison, Gavin Melaugh, Chris Rodesney, Aled E. L. Roberts, Yasuhiko Irie, Peter Ø. Jensen, Stephen P. Diggle, Rosalind J. Allen, Vernita Gordon, Thomas Bjarnsholt

Yasuhiko Irie

In traditional models of in vitro biofilm development, individual bacterial cells seed a surface, multiply, and mature into multicellular, three-dimensional structures. Much research has been devoted to elucidating the mechanisms governing the initial attachment of single cells to surfaces. However, in natural environments and during infection, bacterial cells tend to clump as multicellular aggregates, and biofilms can also slough off aggregates as a part of the dispersal process. This makes it likely that biofilms are often seeded by aggregates and single cells, yet how these aggregates impact biofilm initiation and development is not known. Here we use a combination of ...


Chip-Seq And Rna-Seq Reveal An Amrz-Mediated Mechanism For Cyclic Di-Gmp Synthesis And Biofilm Development By Pseudomonas Aeruginosa, Christopher J. Jones, David Newsom, Benjamin Kelly, Yasuhiko Irie, Laura K. Jennings, Binjie Xu, Dominique H. Limoli, Joe J. Harrison, Matthew R. Parsek, Peter White, Daniel J. Wozniak 2016 The Ohio State University

Chip-Seq And Rna-Seq Reveal An Amrz-Mediated Mechanism For Cyclic Di-Gmp Synthesis And Biofilm Development By Pseudomonas Aeruginosa, Christopher J. Jones, David Newsom, Benjamin Kelly, Yasuhiko Irie, Laura K. Jennings, Binjie Xu, Dominique H. Limoli, Joe J. Harrison, Matthew R. Parsek, Peter White, Daniel J. Wozniak

Yasuhiko Irie

The transcription factor AmrZ regulates genes important for P. aeruginosa virulence, including type IV pili, extracellular polysaccharides, and the flagellum; however, the global effect of AmrZ on gene expression remains unknown, and therefore, AmrZ may directly regulate many additional genes that are crucial for infection. Compared to the wild type strain, a ΔamrZ mutant exhibits a rugose colony phenotype, which is commonly observed in variants that accumulate the intracellular second messenger cyclic diguanylate (c-di-GMP). Cyclic di-GMP is produced by diguanylate cyclases (DGC) and degraded by phosphodiesterases (PDE). We hypothesized that AmrZ limits the intracellular accumulation of c-di-GMP through transcriptional repression ...


The Cababc Operon Essential For Biofilm And Rugose Colony Development In Vibrio Vulnificus, Jin Hwan Park, Youmi Jo, Song Yee Jang, Haenaem Kwon, Yasuhiko Irie, Matthew R. Parsek, Myung Hee Kim, Sang Ho Choi 2016 Seoul National University

The Cababc Operon Essential For Biofilm And Rugose Colony Development In Vibrio Vulnificus, Jin Hwan Park, Youmi Jo, Song Yee Jang, Haenaem Kwon, Yasuhiko Irie, Matthew R. Parsek, Myung Hee Kim, Sang Ho Choi

Yasuhiko Irie

A transcriptome analysis identified Vibrio vulnificus cabABC genes which were preferentially expressed in biofilms. The cabABC genes were transcribed as a single operon. The cabA gene was induced by elevated 3′,5′-cyclic diguanylic acid (c-di-GMP) and encoded a calcium-binding protein CabA. Comparison of the biofilms produced by the cabA mutant and its parent strain JN111 in microtiter plates using crystal-violet staining demonstrated that CabA contributed to biofilm formation in a calcium-dependent manner under elevated c-di-GMP conditions. Genetic and biochemical analyses revealed that CabA was secreted to the cell exterior through functional CabB and CabC, distributed throughout the biofilm matrix ...


Exploring Molecular Mechanisms Of Paradoxical Activation In The Braf Kinase Dimers: Atomistic Simulations Of Conformational Dynamics And Modeling Of Allosteric Communication Networks And Signaling Pathways, Amanda Tse, Gennady M. Verkhivker 2016 Chapman University

Exploring Molecular Mechanisms Of Paradoxical Activation In The Braf Kinase Dimers: Atomistic Simulations Of Conformational Dynamics And Modeling Of Allosteric Communication Networks And Signaling Pathways, Amanda Tse, Gennady M. Verkhivker

Mathematics, Physics, and Computer Science Faculty Articles and Research

The recent studies have revealed that most BRAF inhibitors can paradoxically induce kinase activation by promoting dimerization and enzyme transactivation. Despite rapidly growing number of structural and functional studies about the BRAF dimer complexes, the molecular basis of paradoxical activation phenomenon is poorly understood and remains largely hypothetical. In this work, we have explored the relationships between inhibitor binding, protein dynamics and allosteric signaling in the BRAF dimers using a network-centric approach. Using this theoretical framework, we have combined molecular dynamics simulations with coevolutionary analysis and modeling of the residue interaction networks to determine molecular determinants of paradoxical activation. We ...


Expression Of The Primary Carbohydrate Component Of The Bordetella Bronchiseptica Biofilm Matrix Is Dependent On Growth Phase But Independent Of Bvg Regulation, Yasuhiko Irie, Andrew Preston, Ming H. Yuk 2016 University of Dayton

Expression Of The Primary Carbohydrate Component Of The Bordetella Bronchiseptica Biofilm Matrix Is Dependent On Growth Phase But Independent Of Bvg Regulation, Yasuhiko Irie, Andrew Preston, Ming H. Yuk

Yasuhiko Irie

We previously showed that the Bvg virulence control system regulates biofilm formation in Bordetella bronchiseptica (Y. Irie, S. Mattoo, and M. H. Yuk, J. Bacteriol. 186:5692-5698, 2004). Analyses of the extracellular components of B. bronchiseptica biofilm matrix revealed that the major sugar component in the matrix was xylose, and linkage analysis indicated a majority of it to be in a 4-linked polymeric form. The production of xylose was independent of Bvg regulation but instead was dependent on bacterial growth phase. In addition, N-acetyl-glucosamine in the matrix was found to be important for the initial development of the biofilm ...


Fluorescence-Based Reporter For Gauging Cyclic Di-Gmp Levels In Pseudomonas Aeruginosa, Morten T. Rybtke, Bradley R. Borlee, Keiji Murakami, Yasuhiko Irie, Morten Hentzer, Thomas E. Nielsen, Michael Givskov, Matthew R. Parsek, Tim Tolker-Nielsen 2016 University of Copenhagen

Fluorescence-Based Reporter For Gauging Cyclic Di-Gmp Levels In Pseudomonas Aeruginosa, Morten T. Rybtke, Bradley R. Borlee, Keiji Murakami, Yasuhiko Irie, Morten Hentzer, Thomas E. Nielsen, Michael Givskov, Matthew R. Parsek, Tim Tolker-Nielsen

Yasuhiko Irie

The increased tolerance toward the host immune system and antibiotics displayed by biofilm-forming Pseudomonas aeruginosa and other bacteria in chronic infections such as cystic fibrosis bronchopneumonia is of major concern. Targeting of biofilm formation is believed to be a key aspect in the development of novel antipathogenic drugs that can augment the effect of classic antibiotics by decreasing antimicrobial tolerance. The second messenger cyclic di-GMP is a positive regulator of biofilm formation, and cyclic di-GMP signaling is now regarded as a potential target for the development of antipathogenic compounds. Here we describe the development of fluorescent monitors that can gauge ...


Sequence Annotation & Designing Gene-Specific Qpcr Primers (Computational), Raymond A. Enke 2016 enkera@jmu.edu

Sequence Annotation & Designing Gene-Specific Qpcr Primers (Computational), Raymond A. Enke

Ray Enke Ph.D.

This class tested protocol will guide students through the steps for the following activities:
  • Obtaining and annotating genomic DNA and mRNA sequence information
  • Designing primers for quantitative PCR (qPCR) analysis of a cDNA library


Qpcr Primer Standard Curve Assay (Wet Lab) + Kegg Pathway Analysis (Computational), Raymond A. Enke 2016 enkera@jmu.edu

Qpcr Primer Standard Curve Assay (Wet Lab) + Kegg Pathway Analysis (Computational), Raymond A. Enke

Ray Enke Ph.D.

This class tested protocol will guide students through the steps for the following activities:
  • analyzing qPCR standard curve data to determine primer efficiency
  • analyzing differential gene expression experimental qPCR data
  • applying KEGG pathway analysis of selected candidates genes


Exploring The Space Of Rna Secondary Structures, Heather C. Smith 2016 Georgia Institute of Technology

Exploring The Space Of Rna Secondary Structures, Heather C. Smith

Annual Symposium on Biomathematics and Ecology: Education and Research

No abstract provided.


The Regulation Of The Phosphatidate Phosphatase Gene Pah1 And Its Regulatory Role On Cell Homeostasis, Goldie Libby Sherr 2016 The Graduate Center, City University of New York

The Regulation Of The Phosphatidate Phosphatase Gene Pah1 And Its Regulatory Role On Cell Homeostasis, Goldie Libby Sherr

All Graduate Works by Year: Dissertations, Theses, and Capstone Projects

The Saccharomyces cerevisiae gene, PAH1, encodes a phosphatidate (PA) phosphatase that plays a fundamental role in lipid metabolism. PA phosphatases are key enzymes that catalyze the PA dephosphorylation reaction to form diacylglycerides, the first step in the synthesis of triacylglycerols. Pah1p, one of the main PA phosphatases in yeast, has not only emerged as a key player in lipid biosynthetic pathways, but also acts as an important regulator of nuclear membrane biogenesis, the transcriptional regulation of many inositol-sensitive upstream activating sequence (UASINO)containing genes needed for phospholipid synthesis, vacuole homeostasis, and lipid droplet formation. Due to its crucial role ...


Telomere Length Variation In Preschool Children: Associations With Chronic Family Stress, Maternal Depression, And Cortisol Reactivity, Aditi Thakur 2016 The University of Western Ontario

Telomere Length Variation In Preschool Children: Associations With Chronic Family Stress, Maternal Depression, And Cortisol Reactivity, Aditi Thakur

Electronic Thesis and Dissertation Repository

Telomeres are repetitive nucleotide repeats of TTAGGG sequences located at the two ends of each chromosome. Telomeres protect DNA from degradation and maintain genomic stability. Shorter telomeres are implicated in different diseases and disorders including psychiatric disorders. I measured buccal cell telomere length (TL) in 384 pre-school children (3-4 years), from Southwestern Ontario using monochrome multiplex qPCR method. I assessed the associations between TL and family, child-specific variables. I did not find a significant correlation between TL and maternal depression, chronic family stress, or age and sex of the children. However, I found a significant positive correlation between TL and ...


Optimization Of A Genomic Editing System Using Crispr/Cas9-Induced Site-Specific Gene Integration, Jillian L. McCool Ms., Nick Hum, Gabriela G. Loots 2016 California State University, Chico

Optimization Of A Genomic Editing System Using Crispr/Cas9-Induced Site-Specific Gene Integration, Jillian L. Mccool Ms., Nick Hum, Gabriela G. Loots

STAR (STEM Teacher and Researcher) Presentations

The CRISPR-Cas system is an adaptive immune system found in bacteria which helps protect against the invasion of other microorganisms. This system induces double stranded breaks at precise genomic loci (1) in which repairs are initiated and insertions of a target are completed in the process. This mechanism can be used in eukaryotic cells in combination with sgRNAs (1) as a tool for genome editing. By using this CRISPR-Cas system, in addition to the “safe harbor locus,” ROSAβ26, the incorporation of a target gene into a site that is not susceptible to gene silencing effects can be achieved through few ...


Relationship Between Morphogenesis And Secretion In The Filamentous Fungus Aspergillus Nidulans, Lakshmi Preethi Yerra 2016 University of Nebraska-Lincoln

Relationship Between Morphogenesis And Secretion In The Filamentous Fungus Aspergillus Nidulans, Lakshmi Preethi Yerra

Dissertations and Theses in Biological Sciences

Filamentous fungi have a long history in biotechnology for the production of food ingredients, pharmaceuticals and enzymes. The advancements made in recent years have earned filamentous fungi such as Aspergillus species a dominant place among microbial cell factories. Although the model fungus A. nidulans has been extensively studied, the genetic and regulatory networks that underlie morphogenesis and development have yet to be fully characterized. The Rho GTPases (Cdc42 and RacA) are one of the most important regulators of the morphogenetic processes among diverse eukaryotic organisms. Although the functions of these GTPases are relatively well-characterized, little is known about their downstream ...


Morpholino-Mediated Knockdown Of Dux4 Toward Facioscapulohumeral Muscular Dystrophy Therapeutics, Jennifer C. J. Chen, Oliver D. King, Yuanfan Zhang, Nicholas P. Clayton, Carrie Spencer, Bruce M. Wentworth, Charles P. Emerson Jr., Kathryn R. Wagner 2016 University of Massachusetts Medical School

Morpholino-Mediated Knockdown Of Dux4 Toward Facioscapulohumeral Muscular Dystrophy Therapeutics, Jennifer C. J. Chen, Oliver D. King, Yuanfan Zhang, Nicholas P. Clayton, Carrie Spencer, Bruce M. Wentworth, Charles P. Emerson Jr., Kathryn R. Wagner

Cell and Developmental Biology Publications and Presentations

Derepression of DUX4 in skeletal muscle has emerged as a likely cause of pathology in facioscapulohumeral muscular dystrophy (FSHD). Here we report on the use of antisense phosphorodiamidate morpholino oligonucleotides to suppress DUX4 expression and function in FSHD myotubes and xenografts. The most effective was phosphorodiamidate morpholino oligonucleotide FM10, which targets the polyadenylation signal of DUX4. FM10 had no significant cell toxicity, and RNA-seq analyses of FSHD and control myotubes revealed that FM10 down-regulated many transcriptional targets of DUX4, without overt off-target effects. Electroporation of FM10 into FSHD patient muscle xenografts in mice also down-regulated DUX4 and DUX4 targets. These ...


Comparative Genomics, Transcriptomics, And Physiology Distinguish Symbiotic From Free-Living Chlorella Strains, Cristian F. Quispe, Olivia Sonderman, Maya Khasin, Wayne R. Riekhof, James Van Etten, Kenneth Nickerson 2016 University of Nebraska-Lincoln

Comparative Genomics, Transcriptomics, And Physiology Distinguish Symbiotic From Free-Living Chlorella Strains, Cristian F. Quispe, Olivia Sonderman, Maya Khasin, Wayne R. Riekhof, James Van Etten, Kenneth Nickerson

Kenneth Nickerson Papers

Most animal–microbe symbiotic interactions must be advantageous to the host and provide nutritional benefits to the endosymbiont. When the host provides nutrients, it can gain the capacity to control the interaction, promote self-growth, and increase its fitness. Chlorella-like green algae engage in symbiotic relationships with certain protozoans, a partnership that significantly impacts the physiology of both organisms. Consequently, it is often challenging to grow axenic Chlorella cultures after isolation from the host because they are nutrient fastidious and often susceptible to virus infection. We hypothesize that the establishment of a symbiotic relationship resulted in natural selection for nutritional and ...


Distribution Of Genomic Variation In The Usda Soybean Germplasm Collection And Relationship With Phenotypic Variation, Nonoy Batiller Bandillo 2016 University of Nebraska-Lincoln

Distribution Of Genomic Variation In The Usda Soybean Germplasm Collection And Relationship With Phenotypic Variation, Nonoy Batiller Bandillo

Theses, Dissertations, and Student Research in Agronomy and Horticulture

The USDA Soybean Germplasm Collection harbors a large stock of genetic diversity with potential to accelerate soybean cultivar development. The extent and nature of favorable alleles contained in the collection are not well known nor is the distribution of genetic variation and how it relates to phenotypic variation. The genotyping of the entire USDA Soybean Germplasm Collection marked the beginning of a systematic exploration of genetic diversity for genetic research and breeding. In this research, we conducted the first comprehensive analysis of population structure on the collection of ~14,400 soybean accessions [Glycine max (L.) Merr. and G. soja Siebold ...


Divergent Activity Of The Gonadotropin Releasing Hormone Receptor Gene Promoter Among Genetic Lines Of Pigs Is Partially Conferred By Nuclear Factor (Nf)-Kb, Specificity Protein (Sp)1-Like And Gata-4 Binding Sites, Emily A. McDonald, Jacqueline E. Smith, Rebecca A. Cederberg, Brett R. White 2016 University of Nebraska - Lincoln

Divergent Activity Of The Gonadotropin Releasing Hormone Receptor Gene Promoter Among Genetic Lines Of Pigs Is Partially Conferred By Nuclear Factor (Nf)-Kb, Specificity Protein (Sp)1-Like And Gata-4 Binding Sites, Emily A. Mcdonald, Jacqueline E. Smith, Rebecca A. Cederberg, Brett R. White

Faculty Papers and Publications in Animal Science

BACKGROUND: Binding of gonadotropin-releasing hormone (GnRH) to its receptor (GnRHR) on gonadotropes within the anterior pituitary gland is essential to reproduction. In pigs, the GnRHR gene is also located near a genetic marker for ovulation rate, a primary determinant of prolificacy. We hypothesized that pituitary expression of the GnRHR gene is alternatively regulated in genetic strains with elevated ovulation rates (Chinese Meishan and Nebraska Index) vs. standard white crossbred swine (Control).

METHODS: Luciferase reporter vectors containing 5118 bp of GnRHR gene promoter from either the Control, Index or Meishan swine lines were generated. Transient transfection of line-specific, full length, deletion ...


Functional Characterization Of Recombinant Interleukin (Il)-17a/F1 In The Japanese Pufferfish (Takifugu Rubripes), Jun-ichi Hikima Dr., Koshin Mihara, Shun Maekawa, Han-Ching Wang, Takashi Aoki, Tomoya Kono, Masahiro Sakai 2016 University of Miyazaki, Faculty of Agriculture

Functional Characterization Of Recombinant Interleukin (Il)-17a/F1 In The Japanese Pufferfish (Takifugu Rubripes), Jun-Ichi Hikima Dr., Koshin Mihara, Shun Maekawa, Han-Ching Wang, Takashi Aoki, Tomoya Kono, Masahiro Sakai

2nd International Conference of Fish & Shellfish Immunology

No abstract provided.


Identification And Characterization Of Heat Shock Transcription Factor 1 Isoforms In Orange-Spotted Grouper (Epinephelus Coioides), Tingyu Wang 2016 National Cheng Kung University

Identification And Characterization Of Heat Shock Transcription Factor 1 Isoforms In Orange-Spotted Grouper (Epinephelus Coioides), Tingyu Wang

2nd International Conference of Fish & Shellfish Immunology

No abstract provided.


Implication Of Biological And Synthetic Nanoparticles In Evolution And Development Of Antibiotic Resistance Relevant For Aquaculture, Petter Langlete 2016 University of Oslo

Implication Of Biological And Synthetic Nanoparticles In Evolution And Development Of Antibiotic Resistance Relevant For Aquaculture, Petter Langlete

2nd International Conference of Fish & Shellfish Immunology

No abstract provided.


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