Download or read book Genetic Analysis of the Maintenance of Neuronal Morphology in Drosophila Melanogaster written by Jessica LaMae Whited and published by . This book was released on 2006 with total page 251 pages. Available in PDF, EPUB and Kindle. Book excerpt: (Cont.) Establishment and maintenance of complex axonal trajectories is also a key feature of neuronal mophology. I identified a requirement for a novel cytoplasmic tyrosine phosphatase, PTPMEG, in these processes. Normal mushroom bodies, structures critical for insect learning and memory, have dorsally-projecting alpha lobe and medially-projecting beta lobe axons. Alpha lobes develop normally in ptpmeg mutants, but their pattern is not maintained. Instead, alpha lobe axons retract during pupation, resulting in thin and/or shortened alpha lobes. Meanwhile, beta lobe axons overextend at the midline. Removing ptpmeg function in mushroom bodies does not cause mutant phenotypes. ptpmeg mutants are rescued by pan-neuronal expression of wild-type Ptpmeg, but not by versions with disrupted phosphatase activity. These data suggest that Ptpmeg activity is required in another type of neuron to prevent mushroom body axon retraction. Ellipsoid body axons normally form a ring structure in the central brain. In ptpmeg mutants, the ellipsoid body axons develop abnormally, with the ventral side of the ring being discontinuous; the defect can be rescued by expression of wild-type Ptpmeg pan-neuronally.
Download or read book Identification of Genetic Factors That Affect Neuronal Patterning Function and Disease in Drosophila Melanogaster written by Claire Reynolds and published by . This book was released on 2017 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Heparan Sulfate Proteoglycans (HSPGs) are required for normal synaptic development at the Drosophila melanogaster larval neuromuscular junction (NMJ). When enzymes required for biosynthesis of HSPGs are inhibited through mutations of RNA interference, a variety of morphological and electrophysiological defects are observed at the NMJ. These defects included changes in the post-synaptic specialization of the muscle (the SSR), loss of mitochondria from the sub-synaptic cytosol, and abnormal mitochondrial morphology. Identification of autophagic regulation as the mechanism by which HSPGs influenced synaptic properties was the foundation of this dissertation.The present work more fully characterizes the influence of HSPG function on autophagic markers in muscle tissue. Confocal microscopic and Western blot analysis of both endogenous proteins and ectopically expressed reporter constructs was used to assess the level of autophagic degradation in muscle tissue. RNA inhibition of sfl and ttv, two HS biosynthetic enzymes, influenced these measures of autophagy in a direction that indicated an overall increase in autophagic flux.HSPGs are ubiquitously expressed, and have a variety of critical functions throughout the organism. Similarly, autophagy is a globally important catabolic pathway. To better understand the significance of this novel regulatory role for HSPGs, we extended our analysis into a second tissue. Drosophila fat body tissue is an energetically sensitive tissue in which autophagy is commonly studied. Using many of the same assays, we identified a similar increase in autophagy in response to HSPG biosynthetic inhibition that was non-cell autonomous.While autophagy is important for the maintenance of cellular homeostasis throughout the organism, certain cell types are more reliant on this pathway than others. Neurons are one such autophagy sensitive cell type, and failure of neuronal autophagy is closely associated with neurodegenerative disease. When HSPGs were inhibited in the brain of adult flies, an increase in autophagic degradation was once again identified. This increase in autophagy protected against the accumulation of oxidant-damaged cellular components after environmental exposure to hydrogen peroxide, and reduced neuronal death in a model of Alzheimers disease. These findings indicate that the regulation of autophagy by HSPGs is of high clinical relevance to human health.This thesis also describes an attempt to develop a Drosophila behavioral assessment protocol intended to provide biological validation of Autism Spectrum Disorder (ASD) candidate genes. Sequencing and microarray analysis of individuals with Autism spectrum disorders has implicated an overwhelmingly large pool of candidate genes. Thorough assessment of the functional contributions of these genes to neurobehavioral development in model organisms is most drastically hindered by the generally low rate of recurrence in genetic changes affecting each candidate gene.Behavioral screening in the inexpensive and genetically facile model D. melanogaster was attempted using RNA interference (RNAi) to model genetic changes associated with human ASD and identify high-throughput behavioral methods suitable for providing the lacking biological validation for these genetic models. Three behavioral methods were selected based on their compatibility and straightforwardness, with consideration for evidence of previous successful use in established fly models of Autism. While the pilot run of this study was able to identify a few phenotypes of potential interest, the majority of the data indicated that these methods were not well-suited to the use of RNAi.
Download or read book Behavioral Genetics of the Fly Drosophila Melanogaster written by Josh Dubnau and published by Cambridge University Press. This book was released on 2014-06-26 with total page 309 pages. Available in PDF, EPUB and Kindle. Book excerpt: A comprehensive portrayal of the behaviour genetics of the fruit fly (Drosophila melanogaster) and the methods used in these studies.
Download or read book Bisphenol A written by Pinar Erkekoglu and published by BoD – Books on Demand. This book was released on 2017-06-07 with total page 166 pages. Available in PDF, EPUB and Kindle. Book excerpt: Bisphenol A (BPA) is a synthetic compound for hardening and clearing polycarbonate plastics. BPA is mainly classified as an estrogen-like endocrine-disrupting chemical. In the last decade, attention has arisen in scientific communities that it is not safe to use this chemical in mainly polycarbonate plastics. Exposure to BPA starts in prenatal period, which is the critical period for its toxic effects on different organs. Throughout this book, the readers will obtain information on the effects of BPA on different systems. They will also get information on the prenatal and postnatal effects of BPA. We believe that readers will get qualified scientific knowledge and a general overview of the toxic effects of BPA exposure and its consequences from this book.
Download or read book Neuromuscular Junctions in Drosophila written by and published by Academic Press. This book was released on 1999-04-29 with total page 317 pages. Available in PDF, EPUB and Kindle. Book excerpt: Neuromuscular Junctions in Drosophila gathers the main contributions that research using the fruit fly Drosophila melanogaster has made in the area of synapse development, synapse physiology, and excitability of muscles and nerve cells. The chapters in this book represent a synthesis of major advances in our understanding of neuronal development and synaptic physiology, which have been obtained using the above approach.This book is directed to the general neuroscience audience: researchers, instructors, graduate students, and advanced undergraduates who are interested in the mechanisms of synapse development and physiology. However, the book will also be a valuable resource for those that use the fruit fly as a model system in their laboratories.Key Features* Synthesizes the genetic approaches used to study synaptic development and function at the neuromuscular junction, using flies as a model system* Covers major recent advances in muscle development, pathfinding, synapse maturation and plasticity, exo- and endocytosis, and ion channel function* Written in clear language that is easily understandable to readers not already familiar with fruit fly research* Includes numerous diagrams and extensive reference lists
Download or read book Fragile X Syndrome written by Randi Jenssen Hagerman and published by . This book was released on 1996 with total page 481 pages. Available in PDF, EPUB and Kindle. Book excerpt: This new edition of Fragile X Syndrome includes updated information on the latest research findings -- especially in molecular biology -- as well as new photographs highlighting clinical features and thorough coverage of treatment and intervention, diagnosis, and research. Praise for the first edition: "Answers nearly all the questions that parents or clinicians might raise about fragile X syndrome....Can be recommended confidently as a thoroughly up-to-date, reliable, and informative account of the condition." -- Lancet "The clinical and cytogenetic material in this book is excellent and provides a strong background for physicians and students... Fragile X Syndrome still presents the best comprehensive treatment of this complex disorder. Physicians, students, and other interested professionals can either read this book from cover to cover or select the chapters that interest or apply to them." -- New England Journal of Medicine
Download or read book Time Love Memory written by Jonathan Weiner and published by Vintage. This book was released on 2014-05-14 with total page 322 pages. Available in PDF, EPUB and Kindle. Book excerpt: The story of Nobel Prize–winning discoveries regarding the molecular mechanisms controlling the body’s circadian rhythm. How much of our fate is decided before we are born? Which of our characteristics is inscribed in our DNA? Weiner brings us into Benzer's Fly Rooms at the California Institute of Technology, where Benzer, and his asssociates are in the process of finding answers, often astonishing ones, to these questions. Part biography, part thrilling scientific detective story, Time, Love, Memory forcefully demonstrates how Benzer's studies are changing our world view--and even our lives. Jonathan Weiner, winner of the Pulitzer Prize for The Beak of the Finch, brings his brilliant reporting skills to the story of Seymour Benzer, the Brooklyn-born maverick scientist whose study of genetics and experiments with fruit fly genes has helped revolutionize or knowledge of the connections between DNA and behavior both animal and human.
Download or read book Behavioural Phenotypes written by Gregory O'Brien and published by Cambridge University Press. This book was released on 1995 with total page 236 pages. Available in PDF, EPUB and Kindle. Book excerpt: A timely distillation of current thinking on the presentation of behavioural disorders and their origins.
Download or read book Brain Development in Drosophila melanogaster written by Gerhard Martin Technau and published by Springer Science & Business Media. This book was released on 2009-01-08 with total page 173 pages. Available in PDF, EPUB and Kindle. Book excerpt: The fruitfly Drosophila melanogaster is an ideal model system to study processes of the central nervous system This book provides an overview of some major facets of recent research on Drosophila brain development.
Download or read book Sperm Biology written by Scott S. Pitnick and published by Academic Press. This book was released on 2008-11-21 with total page 683 pages. Available in PDF, EPUB and Kindle. Book excerpt: Sperm Biology represents the first analysis of the evolutionary significance of sperm phenotypes and derived sperm traits and the possible selection pressures responsible for sperm-egg coevolution. An understanding of sperm evolution is fast developing and promises to shed light on many topics from basic reproductive biology to the evolutionary process itself as well as the sperm proteome, the sperm genome and the quantitative genetics of sperm. The Editors have identified 15 topics of current interest and biological significance to cover all aspects of this bizarre, fascinating and important subject. It comprises the most comprehensive and up-to-date review of the evolution of sperm and pointers for future research, written by experts in both sperm biology and evolutionary biology. The combination of evolution and sperm is a potent mix, and this is the definitive account. - The first review survey of this emerging field - Written by experts from a broad array of disciplines from the physiological and biomedical to the ecological and evolutionary - Sheds light on the intricacies of reproduction and the coevolution of sperm, egg and reproductive behavior
Download or read book Biology of Drosophila written by Milislav Demerec and published by CSHL Press. This book was released on 1994 with total page 650 pages. Available in PDF, EPUB and Kindle. Book excerpt: Biology of Drosophila was first published by John Wiley and Sons in 1950. Until its appearance, no central, synthesized source of biological data on Drosophila melanogaster was available, despite the fly's importance to science for three decades. Ten years in the making, it was an immediate success and remained in print for two decades. However, original copies are now very hard to find. This facsimile edition makes available to the fly community once again its most enduring work of reference.
Download or read book Drosophila melanogaster written by Farzana Khan Perveen and published by BoD – Books on Demand. This book was released on 2018-02-28 with total page 270 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book contains 12 chapters divided into two sections. Section 1 is "Drosophila - Model for Genetics." It covers introduction, chromosomal polymorphism, polytene chromosomes, chromosomal inversion, chromosomal evolution, cell cycle regulators in meiosis and nongenetic transgenerational inheritance in Drosophila. It also includes ecological genetics, wild-type strains, morphometric analysis, cytostatics, frequencies of early and late embryonic lethals (EEL and LEL) and mosaic imaginal discs of Drosophila for genetic analysis in biomedical research. Section 2 is "Drosophila - Model for Therapeutics." It explains Drosophila as model for human diseases, neurodegeneration, heart-kidney metabolic disorders, cancer, pathophysiology of Parkinson's disease, dopamine, neuroprotective therapeutics, mitochondrial dysfunction and translational research. It also covers Drosophila role in ubiquitin-carboxyl-terminal hydrolase-L1 (UCH-L1) protein, eye development, anti-dUCH antibody, neuropathy target esterase (NTE), organophosphorous compound-induced delayed neuropathy (OPIDN) and hereditary spastic paraplegia (HSP). It also includes substrate specificities, kinetic parameters of recombinant glutathione S-transferases E6 and E7 (DmGSTE6 and DmGSTE7), detoxification and insecticidal resistance and antiviral immunity in Drosophila.
Download or read book Insights into Human Neurodegeneration Lessons Learnt from Drosophila written by Mousumi Mutsuddi and published by Springer Nature. This book was released on 2019-12-05 with total page 470 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book is aimed at generating an updated reservoir of scientific endeavors undertaken to unravel the complicated yet intriguing topic of neurodegeneration. Scientists from Europe, USA and India who are experts in the field of neurodegenerative diseases have contributed to this book. This book will help readers gain insight into the recent knowledge obtained from Drosophila model, in understanding the molecular mechanisms underlying neurodegenerative disorders and also unravel novel scopes for therapeutic interventions. Different methodologies available to create humanized fly models that faithfully reflects the pathogenicities associated with particular disorders have been described here. It also includes information on the exciting area of neural stem cells. A brief discussion on neurofibrillary tangles, precedes the elaborate description of lessons learnt from Drosophila about Alzheimer's, Parkinson’s, Spinomuscular Atrophy, Huntington’s diseases, RNA expansion disorders and Hereditary Spastic Paraplegia. We have concluded the book with the use of Drosophila for identifying pharmacological therapies for neurodegenerative disorders. The wide range of topics covered here will not only be relevant for beginners who are new to the concept of the extensive utility of Drosophila as a model to study human disorders; but will also be an important contribution to the scientific community, with an insight into the paradigm shift in our understanding of neurodegenerative disorders. Completed with informative tables and communicative illustrations this book will keep the readers glued and intrigued. We have comprehensively anthologized the lessons learnt on neurodegeneration from Drosophila and have thus provided an insight into the multidimensional aspects of pathogenicities of majority of the neurodegenerative disorders.
Download or read book Research Awards Index written by and published by . This book was released on 1988 with total page 874 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Drosophila Eye Development written by Kevin Moses and published by Springer Science & Business Media. This book was released on 2002-03-12 with total page 296 pages. Available in PDF, EPUB and Kindle. Book excerpt: 1 Kevin Moses It is now 25 years since the study of the development of the compound eye in Drosophila really began with a classic paper (Ready et al. 1976). In 1864, August Weismann published a monograph on the development of Diptera and included some beautiful drawings of the developing imaginal discs (Weismann 1864). One of these is the first description of the third instar eye disc in which Weismann drew a vertical line separating a posterior domain that included a regular pattern of clustered cells from an anterior domain without such a pattern. Weismann suggested that these clusters were the precursors of the adult ommatidia and that the line marks the anterior edge of the eye. In his first suggestion he was absolutely correct - in his second he was wrong. The vertical line shown was not the anterior edge of the eye, but the anterior edge of a moving wave of patterning and cell type specification that 112 years later (1976) Ready, Hansen and Benzer would name the "morphogenetic furrow". While it is too late to hear from August Weismann, it is a particular pleasure to be able to include a chapter in this Volume from the first author of that 1976 paper: Don Ready! These past 25 years have seen an astonishing explosion in the study of the fly eye (see Fig.
Download or read book Molecular Mechanisms of Notch Signaling written by Tilman Borggrefe and published by Springer. This book was released on 2018-07-20 with total page 417 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book describes the Notch signaling pathway with a focus on molecular mechanisms. The Notch signaling pathway is a seemingly simple pathway that does not involve any second messenger. Upon ligand binding two consecutive proteolytic cleavages of the NOTCH receptor release the Notch intracellular domain from the membrane. The Notch intracellular domain migrates into the nucleus and activates gene expression. Recently, new technologies allowed us to better understand this pivotal signaling cascade and revealed new regulatory mechanisms. The different chapters cover many aspects of the Notch signaling focusing on the mechanisms governing the receptor/ligand interaction as well as on the downstream intracellular signaling events. Aspects of both canonical and non-canonical signaling are discussed and the function of Notch signaling in physiological and pathological contexts are elucidated. This book is not only intended for experts but it should also be a useful resource for young, sprouting scientists or interested scientists from other research areas, who may use this book as a stimulating starting point for further discoveries and developments.
Download or read book Dissertation Abstracts International written by and published by . This book was released on 2006 with total page 886 pages. Available in PDF, EPUB and Kindle. Book excerpt:
