Download or read book A Molecular Genetic Analysis of the Role of the Guanine Nucleotide Exchange Factor Trio During Axon Pathfinding in the Embryonic CNS of Drosophila Melanogaster written by David J. Forsthoefel and published by . This book was released on 2005 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Abstract: The Drosophila melanogaster embryo is an ideal system in which to study axon guidance, because of the relative simplicity of the nervous system and the evolutionary conservation of the molecules utilized during development. The Abelson cytoplasmic tyrosine kinase regulates actin cytoskeletal dynamics in Drosophila, mice, and humans. In Drosophila, Abl is expressed in the developing central and peripheral nervous systems (CNS and PNS). In a genetic screen for modifiers of the Abl mutant semilethality phenotype, we identified trio, a cytoplasmic guanine nucleotide exchange factor that is also expressed in the CNS and regulates actin dynamics through Rho GTPases. Mutations in Abl and trio interacted genetically, leading to dramatic disruption of axon pathways at the CNS midline. Building upon these initial observations, we analyzed interactions between Abl, trio, and the attractive Netrin receptor frazzled (fra)/Deleted-in-Colorectal-Cancer (DCC). In fra;Abl and fra;trio double mutants, few axons crossed the midline, similar to the phenotype in trio, Abl mutants. Furthermore, mutations in Abl and trio suppressed the inappropriate midline crossover phenotype in embryos expressing the chimeric Robo-Fra receptor, consistent with an in vivo role for these molecules as Fra effectors. Fra bound Abl and Trio in coimmunoprecipitation and GST pulldown experiments, and tyrosine phosphorylation of Fra and Trio was elevated in cultured cells overexpressing Abl. Mutations in enabled (ena), another Abl substrate, suppressed the loss-of-commissure phenotype in fra, Abl, and trio mutants, as well as the Robo-Fra receptor phenotype. Together, these results suggest that Abl and Trio are effectors for multiple attractive receptors at the CNS midline, and that Ena may function during both attractive and repulsive signaling. Finally, a functional analysis of the requirement for Trio's conserved domains has been initiated. In transgenic rescue and overexpression experiments, TrioGEF1 was required for axon guidance across the CNS midline, while TrioSH3 inhibited midline crossing. Coexpression experiments with the Robo-Fra receptor and assays in other tissues and cultured cells suggest that the conserved N-terminal domain, spectrin-like repeats, and GEF2 domain may modulate GEF1 signaling in specific contexts. Future experiments must elucidate the mechanistic details of cytoskeletal control by Trio and Fra.
Download or read book Analysis of the Role of the Plexin Receptor and the Rho Family GTPase Regulators in Axon Guidance in the Embryonic Central Nervous System of Drosophila Melanogaster written by Hailan Hu and published by . This book was released on 2002 with total page 284 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Dissertation Abstracts International written by and published by . This book was released on 2006 with total page 848 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Analysis of Axon Guidance in the Embryonic Central Nervous System of Drosophila Melanogaster written by Vicki L. McGovern and published by . This book was released on 2003 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Abstract: The goal of developmental neurobiology is to understand how a complex nervous system is wired. During development of the central nervous system (CNS) neural connections are assembled in a highly stereotyped fashion. How do axons find their targets with such accuracy? We know that axon migration is direct by attractive and repulsive guidance cues located in the extracellular environment. While many guidance molecules have been identified, we are only just beginning to understand the mechanisms of axon guidance. In order to identify additional genes involved in axon guidance and CNS development we performed a misexpression screen. Using P-elements and the UAS/GAL4 system, transcription of endogenous genes was induced in the embryonic CNS. Misexpression phenotypes were then identified immunohistochemically with two monoclonal antibodies: BP102, a general axon marker, and 1D4, which labels a subset of axon pathways. Over 4100 individual P-element insertion lines were screened. Twenty-five insertions corresponding to 18 genes resulted in misexpression phenotypes. Genes involved in axon guidance, embryonic patterning, and cell cycle regulation were identified. Several transcription factors that have not been previously implicated in CNS development were isolated and characterized as well. The identification of these transcription factors is intriguing since little is known about the transcriptional regulation of axon guidance genes. Additionally, we have studied the regulation of the previously identified guidance molecule Commissureless (Comm). Comm is necessary for proper axon guidance at the CNS midline of the Drosophila embryo. In the absence of Comm, commissural axons fail to cross the midline and instead make ispilateral projections on their respective sides of the midline. Using mosaic analysis, we have identified a cell autonomous neuronal requirement for Comm. Clones containing mutant alleles of comm formed commissural projections at a statistically significant reduced frequency when compared to wild type clones. This result suggests that regulation of Comm expression in neurons is critical for Comm's function in axon guidance at the CNS midline. These studies have both advanced the understanding of the regulation of Comm, and have identified new potential regulators of guidance molecules.
Download or read book The Role of the Rho Guanine Nucleotide Exchange Factor Trio in Brain Development written by Atefeh Ghogha and published by . This book was released on 2008 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book The Embryonic Development of Drosophila melanogaster written by Jose A. Campos-Ortega and published by Springer Science & Business Media. This book was released on 2013-03-09 with total page 237 pages. Available in PDF, EPUB and Kindle. Book excerpt: " . . . but our knowledge is so weak that no philosoph er will ever be able to completely explore the nature of even a fly . . . " * Thornas Aquinas "In Syrnbolurn Apostolorum" 079 RSV p/96 This is a monograph on embryogenesis of the fruit fly Drosophi la melanogaster conceived as a reference book on morphology of embryonie development. A monograph of this extent and con tent is not yet available in the literature of Drosophila embryolo gy, and we believe that there is areal need for it. Thanks to the progress achieved during the last ten years in the fields of devel opmental and molecular genetics, work on Drosophila develop ment has considerably expanded creating an even greater need for the information that we present here. Our own interest for wildtype embryonie development arose several years ago, when we began to study the development of mutants. While those studies were going on we repeatedly had occasion to state in sufficiencies in the existing literature about the embryology of the wildtype, so that we undertook investigating many of these problems by ourselves. Convinced that several of our colleagues will have encountered similar difficulties we decided to publish the present monograph. Although not expressely recorded, Thomas Aquinas probably referred to the domestic fly and not to the fruit fly. Irrespective of which fly he meant, however, we know that Thomas was right in any case.
Download or read book Encyclopedia of Signaling Molecules written by Sangdun Choi and published by Springer. This book was released on 2012-07-09 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Biological processes are driven by complex systems of functionally interacting signaling molecules. Thus, understanding signaling molecules is essential to explain normal or pathological biological phenomena. A large body of clinical and experimental data has been accumulated over these years, albeit in fragmented state. Hence, systems biological approaches concomitant with the understanding of each molecule are ideal to delineate signaling networks/pathways involved in the biologically important processes. The control of these signaling pathways will enrich our healthier life. Currently, there are more than 30,000 genes in human genome. However, not all the proteins encoded by these genes work equally in order to maintain homeostasis. Understanding the important signaling molecules as completely as possible will significantly improve our research-based teaching and scientific capabilities. This encyclopedia presents 350 biologically important signaling molecules and the content is built on the core concepts of their functions along with early findings written by some of the world’s foremost experts. The molecules are described by recognized leaders in each molecule. The interactions of these single molecules in signal transduction networks will also be explored. This encyclopedia marks a new era in overview of current cellular signaling molecules for the specialist and the interested non-specialist alike During past years, there were multiple databases to gather this information briefly and very partially. Amidst the excitement of these findings, one of the great scientific tasks of the coming century is to bring all the useful information into a place. Such an approach is arduous but at the end will infuse the lacunas and considerably be a streamline in the understanding of vibrant signaling networks. Based on this easy-approach, we can build up more complicated biological systems.
Download or read book Cumulated Index Medicus written by and published by . This book was released on 2000 with total page 1840 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Neuronal Cytoskeleton written by Hirokawa and published by CRC Press. This book was released on 1994-01-12 with total page 360 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book discusses the primary functions of microtubule-associated proteins (MAPs) such as MAP2 and tau in neuronal morphogenesis, as well as relationships between neuronal differentiation and the expression of neuronal intermediate filaments (nestin, alpha internexin, and neurofilament triplet proteins). It emphasizes the importance of several cytoskeletal proteins for neuronal differentiation and morphogenesis, organelle transport, and synaptic functions. The book considers the involvement of tau MAPs in the formation of paired helical filaments in Alzheimer's disease, and it examines the mechanisms of organelle transports and molecular motors such as kinesin, braindynein, and kinesin superfamily proteins. Cytoskeletal proteins involved in synaptic formation and transmitter release and new synaptic junctional-associated proteins are explored as well.
Download or read book Pharmacoepigenetics written by Ramón Cacabelos and published by Academic Press. This book was released on 2019-06-04 with total page 986 pages. Available in PDF, EPUB and Kindle. Book excerpt: Pharmacoepigenetics provides a comprehensive volume on the role of epigenetics and epigenomics in drug discovery and development, providing a detailed, but accessible, view of the field, from basic principles, to applications in disease therapeutics. Leading international researchers from across academia, clinical settings and the pharmaceutical industry discuss the influence of epigenetics and epigenomics in human pathology, epigenetic biomarkers for disease prediction, diagnosis, and treatment, current epigenetic drugs, and the application of epigenetic procedures in drug development. Throughout the book, chapter authors offer a balanced and objective discussion of the future of pharmacoepigenetics and its crucial contribution to the growth of precision and personalized medicine. - Fully examines the influence of epigenetics and epigenomics in human pathology, epigenetic biomarkers for disease prediction, diagnosis, treatment, current epigenetic drugs and the application of epigenetic procedures in drug development - Features chapter contributions from leading international researchers in academia, clinical settings and the pharmaceutical industry - Instructs researchers, students and clinicians on how to better interpret and employ pharmacoepigenetics in drug development, efficiency and safety - Provides a balanced and objective discussion of the future of pharmacoepigenetics and its crucial role in precision medicine
Download or read book A Comparative Methods Approach to the Study of Oocytes and Embryos written by Joel D. Richter and published by Oxford University Press, USA. This book was released on 1999-01 with total page 520 pages. Available in PDF, EPUB and Kindle. Book excerpt: Over the past twenty years, biologists have made remarkable progress in understanding each step as a single fertilized egg develops into a mature organism, and the research draws on a tremendous array of experimental techniques. A Comparative Methods Approach to the Study of Oocytes and Embryos takes a unique approach to the field, providing a hands-on guide to three of the most important experimental subjects--frogs, fruitflies, and mice. By collecting reliable techniques in a single volume, the book is both an invaluable resource for new researchers and an ideal platform for comparing these seemingly disparate biological systems. The volume contains work from many leaders in the field and spans research in genetics, molecular and cellular biology, and morphology. It includes methods for oocyte and embryo culture, microinjection, in situ hybridization, immunohistochemistry, time-lapse microscopy, intracellular ion measurements, and embryonic dissections.
Download or read book Drosophila Protocols written by William Sullivan and published by CSHL Press. This book was released on 2000 with total page 798 pages. Available in PDF, EPUB and Kindle. Book excerpt: This exceptional laboratory manual describes thirty-seven procedures most likely to be used in the next decade for molecular, biochemical, and cellular studies on Drosophila. They were selected after extensive consultation with the research community and rigorously edited for clarity, uniformity, and conciseness.The methods included permit investigation of chromosomes, cell biology, molecular biology, genomes, biochemistry, and development. Each protocol includes the basic information needed by novices, with sufficient detail to be valuable to experienced investigators. Each method is carefully introduced and illustrated with figures, tables, illustrations, and examples of the data obtainable. The book's appendices include key aspects of Drosophila biology, essential solutions, buffers, and recipes.An evolution of Michael Ashburner's 1989 classic Drosophila: A Laboratory Manual, this book is an essential addition to the personal library of Drosophila investigators and an incomparable resource for other research groups with goals likely to require fly-based technical approaches.
Download or read book Protein Tyrosine Phosphatases in Cancer written by Benjamin G. Neel and published by Springer. This book was released on 2016-08-05 with total page 362 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book aims to bridge the gap in understanding how protein-tyrosine phosphatases (PTPs), which carry out the reverse reaction of tyrosine phosphorylation, feature in cancer cell biology. The expertly authored chapters will first review the general features of the PTP superfamily, including their overall structure and enzymological properties; use selected examples of individual PTP superfamily members, to illustrate emerging data on the role of PTPs in cancer; and will review the current status of PTP-based drug development efforts. Protein Tyrosine Phosphatases in Cancer,from renowned researchers Benjamin Neel and Nicholas Tonks, is invaluable reading for researchers in oncology, stem cell signaling,and biochemistry.
Download or read book Principles of Genome Analysis and Genomics written by Sandy B. Primrose and published by John Wiley & Sons. This book was released on 2009-04-01 with total page 288 pages. Available in PDF, EPUB and Kindle. Book excerpt: With the first draft of the human genome project in the publicdomain and full analyses of model genomes now available, thesubject matter of 'Principles of Genome Analysis and Genomics' iseven 'hotter' now than when the first two editions were publishedin 1995 and 1998. In the new edition of this very practical guideto the different techniques and theory behind genomes and genomeanalysis, Sandy Primrose and new author Richard Twyman provide afresh look at this topic. In the light of recent excitingadvancements in the field, the authors have completely revised andrewritten many parts of the new edition with the addition of fivenew chapters. Aimed at upper level students, it is essential thatin this extremely fast moving topic area the text is up to date andrelevant. Completely revised new edition of an establishedtextbook. Features new chapters and examples from exciting new researchin genomics, including the human genome project. Excellent new co-author in Richard Twyman, also co-author ofthe new edition of hugely popular Principles of GeneManipulation. Accompanying web-page to help students deal with this difficulttopic at www.blackwellpublishing.com/primrose
Download or read book Using Medicine in Science Fiction written by H. G. Stratmann and published by Springer. This book was released on 2015-09-14 with total page 564 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book offers a clearly written, entertaining and comprehensive source of medical information for both writers and readers of science fiction. Science fiction in print, in movies and on television all too often presents dubious or simply incorrect depictions of human biology and medical issues. This book explores the real science behind such topics as how our bodies adapt to being in space, the real-life feasibility of common plot elements such as suspended animation and medical nanotechnology, and future prospects for improving health, prolonging our lives, and enhancing our bodies through technology. Each chapter focuses on a single important science fiction-related subject, combining concise factual information with examples drawn from science fiction in all media. Chapters conclude with a “Bottom Line” section summarizing the most important points discussed in the chapter and giving science fiction writers practical advice on how to incorporate them into their own creations, including a list of references for further reading. The book will appeal to all readers interested in learning about the latest ideas on a variety of science fiction-related medical topics, and offers an invaluable reference source for writers seeking to increase the realism and readability of their works. Henry G. Stratmann, MD, FACC, FACP is a cardiologist with board certifications in internal medicine, cardiology, and nuclear cardiology. Befor e entering private practice he became Professor of Medicine at St. Louis University School of Medicine and performed clinical medical research. Henry received a BA in chemistry from St. Louis University and his MD at Southern Illinois University School of Medicine. He is currently enrolled at Missouri State University to obtain a BS in physics with a minor in astronomy. His professional publications include being an author or coauthor of many research articles for medical journals, primarily in the field of nuclear cardiology. Henry is also a regular contributor of both stories and science fact articles to Analog Science Fiction and Fact.
Download or read book Cellular Migration and Formation of Neuronal Connections written by and published by Academic Press. This book was released on 2013-05-06 with total page 1081 pages. Available in PDF, EPUB and Kindle. Book excerpt: The genetic, molecular, and cellular mechanisms of neural development are essential for understanding evolution and disorders of neural systems. Recent advances in genetic, molecular, and cell biological methods have generated a massive increase in new information, but there is a paucity of comprehensive and up-to-date syntheses, references, and historical perspectives on this important subject. The Comprehensive Developmental Neuroscience series is designed to fill this gap, offering the most thorough coverage of this field on the market today and addressing all aspects of how the nervous system and its components develop. Particular attention is paid to the effects of abnormal development and on new psychiatric/neurological treatments being developed based on our increased understanding of developmental mechanisms. Each volume in the series consists of review style articles that average 15-20pp and feature numerous illustrations and full references. Volume 2 offers 56 high level articles devoted mainly to Formation of Axons and Dendrites, Migration, Synaptogenesis, Developmental Sequences in the Maturation of Intrinsic and Synapse Driven Patterns. - Series offers 144 articles for 2904 full color pages addressing ways in which the nervous system and its components develop - Features leading experts in various subfields as Section Editors and article Authors - All articles peer reviewed by Section Editors to ensure accuracy, thoroughness, and scholarship - Volume 2 sections include coverage of mechanisms which regulate: the formation of axons and dendrites, cell migration, synapse formation and maintenance during development, and neural activity, from cell-intrinsic maturation to early correlated patterns of activity
Download or read book Cell Migration written by Claire M. Wells and published by Humana Press. This book was released on 2017-05-04 with total page 463 pages. Available in PDF, EPUB and Kindle. Book excerpt: Cell migration is a key component of many biological processes including embryonic development, immune responses, wound healing, organ regeneration, and cancer cell metastasis, thus making it an exciting and crucial field of study. The aim of Cell Migration: Developmental Methods and Protocols, Second Edition is to bring together a wide range of these techniques from the more basic migration assays, which are still the foundation of many cell migration studies, to state-of-the-art techniques and recent technical advances. Divided into three convenient parts, the volume begins with a number of basic in vitro migration assays including measurements of wound healing, cell scattering, invasion, and chemotaxis, as well as more complex measurements of transendothelial migration, the use of microfluidic chambers, and imaging cell migration in 3D. It continues with procedures for the imaging and measurement of cell migration in vivo including protocols for the use of chick, drosophila, and zebrafish embryos, and methods to measure metastatic spread and angiogenesis in mice, then concludes with a vital section on emerging techniques in the cell migration field including the use of TIRF, FRAP, and FRET microscopy. Written in the highly successful Methods in Molecular BiologyTM series format, chapters include introductions to their respective topics, lists of the necessary materials and reagents, step-by-step, readily reproducible laboratory protocols, and notes from the experts on troubleshooting and avoiding known pitfalls. Comprehensive and up-to-date, Cell Migration: Developmental Methods and Protocols, Second Edition provides a comprehensive catalogue of techniques for the study of cell migration that can be used as a useful reference source for any researcher who wishes to explore this significant area of cell biology.
