Download or read book The Biochemical Mechanisms Underlying Nuclear RNA Interference in C Elegans written by Alexandra Lewis and published by . This book was released on 2022 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: "RNA interference (RNAi) pathways regulate gene expression in almost all eukaryotes in a sequence-specific manner that depends on complementarity between a small RNA and an mRNA target. In order to effect target silencing, small RNAs are loaded onto Argonautes that can silence their targets post-transcriptionally in the cytoplasm, or transcriptionally in the nucleus in a process called nuclear RNAi. Nuclear RNAi pathways play important roles in organismal development, defense against viruses and transposable elements, and chromosomal organization. Nuclear RNAi links small RNA pathways with chromatin modifications that can, in some cases, be passed on to the next generation. In C. elegans for example, nuclear RNAi triggers heterochromatic histone methylation that can be inherited for many generations. While many of the major genes involved in the pathway are known, it remains unclear how Argonautes and the nuclear RNAi machinery are regulated and how they recruit chromatin-modifying proteins.Through a combination of genetic and biochemical assays, the research presented in this thesis outlines specific mechanisms through which nuclear RNAi in C. elegans is regulated and demonstrates physical links between proteins that provide clarity on how silencing is achieved. We identified a novel family of nuclear Argonaute binding proteins (the ENRIs) and demonstrated the mechanism by which they control the strength and target specificity of nuclear RNAi. ENRI-1/2 prevent misloading of the nuclear Argonaute NRDE-3 with aberrant small RNAs, and in doing so prevent the premature nuclear localization of NRDE-3 in early embryos. Loss of ENRI-3 impairs inheritance of RNAi phenotypes and leads to misregulation of small RNAs. In addition, we showed that post- translational modifications of ENRI-2 affect many aspects of its function. Phosphorylation6of ENRI-2 impairs nuclear RNAi and alters its localization. Finally, we showed how the nuclear RNAi machinery assembles in the nucleus and demonstrated physical links between some of these proteins for the first time. We found that two of these proteins, NRDE-1 and NRDE-4, form a stable complex that form a signaling platform that is required for heritable nuclear RNAi through the recruitment of a phosphatase.Overall, this thesis delineates novel modes and layers of regulation of the nuclear RNAi pathway and provides important biochemical insight into the pathway's mechanism"--
Download or read book Der Maihak Indikator written by and published by . This book was released on 1912 with total page 38 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Developmental Timing written by and published by Academic Press. This book was released on 2013-09-04 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: This new volume of Current Topics in Developmental Biology covers developmental timing, with contributions from an international board of authors. The chapters provide a comprehensive set of reviews covering such topics as the timing of developmental programs in Drosophila, temporal patterning of neural progenitors, and environmental modulation of developmental timing.
Download or read book RNA Infrastructure and Networks written by Lesley J. Collins and published by Springer Science & Business Media. This book was released on 2011-09-15 with total page 297 pages. Available in PDF, EPUB and Kindle. Book excerpt: RNAs form complexes with proteins and other RNAs. The RNA‐infrastructure represents the spatiotemporal interaction of these proteins and RNAs in a cell‐wide network. RNA Infrastructure and Networks brings together these ideas to illustrate the scope of RNA‐based biology, and how connecting RNA mechanisms is a powerful tool to investigate regulatory pathways. This book is but a taste of the wide range of RNA‐based mechanisms that connect in the RNA infrastructure.
Download or read book Phenotypes and Genetic Mechanisms of C Elegans Enhanced RNAi written by Jimmy Jiajia Zhuang and published by . This book was released on 2013 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: RNA interference (RNAi) potently and specifically induces gene knockdown, and its potential for reverse genetics in Caenorhabditis elegans is enormous. However, even in these nematodes, RNAi can be induced more effectively via enhanced RNAi (Eri) mutant backgrounds. With advances in small RNA sequencing, evidence has suggested that the eri pathway plays an endogenous gene regulatory role, which competes with experimentally introduced RNAi triggers for limiting resources. However, the nature, cellular location, and physiological consequences of this small RNA pathways competition remain unclear. To answer these questions, I first fully characterized the genetic phenotypes of all known Eri mutants. I discovered that different components of the eri pathway have subtle differences upon mutation, which affects more than exogenous RNAi. I then attempted to screen for novel enhanced RNAi mutants, guided by hypothetical mechanisms or tissues of expression not associated with known mutants. After these attempts, I fully characterized the genetic mechanisms that account for enhanced RNAi. Surprisingly, I discovered that the nuclear Argonaute nrde-3 and the peri-nuclear P-granule component pgl-1 are necessary and sufficient for an Eri response. Finally, I examined the impact of the competition among microRNA, endogenous siRNA, and exogenous RNAi pathways. I discovered that C. elegans develops slower upon perturbations to its normal flux of small RNA pathways. Insights from these phenotypes and genetic mechanisms shed light on the importance of small RNA biology and offer a novel suite of tools for sensitizing RNAi in broader contexts, especially given the deep evolutionary conservation of most eri-associated genes.
Download or read book Genetics and Molecular Biology written by Robert F. Schleif and published by . This book was released on 1993 with total page 724 pages. Available in PDF, EPUB and Kindle. Book excerpt: In the first edition of Genetics and Molecular Biology, renowned researcher and award-winning teacher Robert Schleif produced a unique and stimulating text that was a notable departure from the standard compendia of facts and observations. Schleif's strategy was to present the underlying fundamental concepts of molecular biology with clear explanations and critical analysis of well-chosen experiments. The result was a concise and practical approach that offered students a real understanding of the subject. This second edition retains that valuable approach--with material thoroughly updated to include an integrated treatment of prokaryotic and eukaryotic molecular biology. Genetics and Molecular Biology is copiously illustrated with two-color line art. Each chapter includes an extensive list of important references to the primary literature, as well as many innovative and thought-provoking problems on material covered in the text or on related topics. These help focus the student's attention of a variety of critical issues. Solutions are provided for half of the problems. Praise for the first edition: "Schleif's Genetics and Molecular Biology... is a remarkable achievement. It is an advanced text, derived from material taught largely to postgraduates, and will probably be thought best suited to budding professionals in molecular genetics. In some ways this would be a pity, because there is also gold here for the rest of us... The lessons here in dealing with the information explosion in biology are that an ounce of rationale is worth a pound of facts and that, for educational value, there is nothing to beat an author writing about stuff he knows from theinside."--Nature. "Schleif presents a quantitative, chemically rigorous approach to analyzing problems in molecular biology. The text is unique and clearly superior to any currently available."--R.L. Bernstein, San Francisco State University. "The greatest strength is the author's ability to challenge the student to become involved and get below the surface."--Clifford Brunk, UCLA
Download or read book Caenorhabditis Elegans written by Henry F. Epstein and published by Academic Press. This book was released on 1995 with total page 687 pages. Available in PDF, EPUB and Kindle. Book excerpt: The first of its kind, this laboratory handbook emphasizes diverse methods and technologies needed to investigate C. elegans, both as an integrated organism and as a model system for research inquiries in cell, developmental, and molecular biology, as well as in genetics and pharmacology. Four primary sections--Genetic and Culture Methods, Neurobiology, Cell and Molecular Biology, and Genomics and Informatics--reflect the cross-disciplinary nature of C. elegans research. Because C. elegans is a simple and malleable organism with a small genome and few cell types, it provides an elegant demonstr.
Download or read book Molecular Biology of the Cell written by and published by . This book was released on 2002 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Oligonucleotide Based Drugs and Therapeutics written by Nicolay Ferrari and published by John Wiley & Sons. This book was released on 2018-07-31 with total page 576 pages. Available in PDF, EPUB and Kindle. Book excerpt: A comprehensive review of contemporary antisense oligonucleotides drugs and therapeutic principles, methods, applications, and research Oligonucleotide-based drugs, in particular antisense oligonucleotides, are part of a growing number of pharmaceutical and biotech programs progressing to treat a wide range of indications including cancer, cardiovascular, neurodegenerative, neuromuscular, and respiratory diseases, as well as other severe and rare diseases. Reviewing fundamentals and offering guidelines for drug discovery and development, this book is a practical guide covering all key aspects of this increasingly popular area of pharmacology and biotech and pharma research, from the basic science behind antisense oligonucleotides chemistry, toxicology, manufacturing, to safety assessments, the design of therapeutic protocols, to clinical experience. Antisense oligonucleotides are single strands of DNA or RNA that are complementary to a chosen sequence. While the idea of antisense oligonucleotides to target single genes dates back to the 1970's, most advances have taken place in recent years. The increasing number of antisense oligonucleotide programs in clinical development is a testament to the progress and understanding of pharmacologic, pharmacokinetic, and toxicologic properties as well as improvement in the delivery of oligonucleotides. This valuable book reviews the fundamentals of oligonucleotides, with a focus on antisense oligonucleotide drugs, and reports on the latest research underway worldwide. • Helps readers understand antisense molecules and their targets, biochemistry, and toxicity mechanisms, roles in disease, and applications for safety and therapeutics • Examines the principles, practices, and tools for scientists in both pre-clinical and clinical settings and how to apply them to antisense oligonucleotides • Provides guidelines for scientists in drug design and discovery to help improve efficiency, assessment, and the success of drug candidates • Includes interdisciplinary perspectives, from academia, industry, regulatory and from the fields of pharmacology, toxicology, biology, and medicinal chemistry Oligonucleotide-Based Drugs and Therapeutics belongs on the reference shelves of chemists, pharmaceutical scientists, chemical biologists, toxicologists and other scientists working in the pharmaceutical and biotechnology industries. It will also be a valuable resource for regulatory specialists and safety assessment professionals and an important reference for academic researchers and post-graduates interested in therapeutics, antisense therapy, and oligonucleotides.
Download or read book RNAi Technology written by R. K. Gaur and published by CRC Press. This book was released on 2016-04-19 with total page 380 pages. Available in PDF, EPUB and Kindle. Book excerpt: RNAi technology is used for large-scale screens that systematically shut down each gene in the cell, which can help identify the components necessary for a particular cellular process or an event such as cell division. Exploitation of the pathway is also a promising tool in biotechnology and medicine. Introducing new technology in the study of RNA
Download or read book Nuclear Mechanics and Genome Regulation written by and published by Academic Press. This book was released on 2010-10-12 with total page 393 pages. Available in PDF, EPUB and Kindle. Book excerpt: In recent years new discoveries have made this an exciting and important field of research. This exhaustive volume presents comprehensive chapters and detailed background information for researchers working with in the field of nuclear mechanics and genome regulation. Both classic and state-of-the-art methods readily adaptable and designed to last the test of time Relevant to clinicians and scientists working in a wide range of fields
Download or read book Reviews of Environmental Contamination and Toxicology Volume 237 written by W.P. de Voogt and published by Springer. This book was released on 2015-11-27 with total page 204 pages. Available in PDF, EPUB and Kindle. Book excerpt: Reviews of Environmental Contamination and Toxicology attempts to provide concise, critical reviews of timely advances, philosophy and significant areas of accomplished or needed endeavor in the total field of xenobiotics, in any segment of the environment, as well as toxicological implications.
Download or read book Modulating Gene Expression written by Aditi Singh and published by BoD – Books on Demand. This book was released on 2019-05-29 with total page 136 pages. Available in PDF, EPUB and Kindle. Book excerpt: RNA interference (RNAi) is a widely used technology for gene silencing and has become a key tool in a myriad of research and lead discoveries. In recent years, the mechanism of RNAi agents has been well investigated, and the technique has been optimized for better effectiveness and safety. On the other hand, the clustered regularly interspaced short palindromic repeats (CRISPR)-associated Cas9/gRNA system is a recent, novel, targeted genome-editing technique derived from the bacterial immune system. Recent advances in gene-editing research and technologies have enabled the CRISPR Cas9 system to become a popular tool for sequence-specific gene editing to correct and modify eukaryotic systems. In this book, we will focus on the mechanisms, applications, regulations (their pros and cons), and various ways in which RNAi-based methods and CRIPSR-Cas9 technology have stimulated the modulation of gene expression, thereby making them a promising therapeutic tool to treat and prevent complex diseases and disorders.
Download or read book RNAi written by Gregory J. Hannon and published by CSHL Press. This book was released on 2003 with total page 568 pages. Available in PDF, EPUB and Kindle. Book excerpt: In the past three years, the use of double-stranded RNA to silence gene activity has become widely and rapidly adopted. RNA interference is highly specific and remarkably potent, and it acts on cells and tissues far removed from the site of introduction. The principles behind RNAi are just being uncovered, but this laboratory technique has been applied effectively in a wide variety of animal and plant species. Variations on RNAi are revolutionizing many approaches to experimental biology, complementing traditional genetic technologies with a quicker and less expensive way of mimicking the effects of mutations both in cell cultures and in living animals. Recent advances in the use of RNAi to engineer heritable silencing in mammals, to alter stem cells for organ reconstitution, and to alter the course of disease in model systems indicate that RNAi may have a future in disease therapy. Written by pioneers in this new field and edited by Gregory Hannon, one of its leading figures, RNAi: A Guide to Gene Silencing presents the principles of RNAi and reliable protocols for its laboratory use in Caenorhabditis elegans, Drosophila, plants, avian embryos, mammalian cells, mouse oocytes, and more. This important and unique book is an essential laboratory resource for scientists studying gene regulation and for all experimental biologists interested in the emerging practical applications of RNAi.
Download or read book Chromatin and Chromosome Structure written by Hsueh Jei Li and published by Elsevier. This book was released on 2012-12-02 with total page 372 pages. Available in PDF, EPUB and Kindle. Book excerpt: Chromatin and Chromosome Structure consists of chapters that reflect a 1975 seminar course and the reported observations after the session. The seminar is organized for the benefit of both faculty and students in the Biology Ph.D. Program of the City University of New York. This book begins with a presentation of the conformational studies of histones. It then describes the histone-DNA interactions and the subunits isolated either from chromatin or from nuclei. It also explains the post-synthetic modifications of histone structure. Furthermore, the book talks about the chemistry and function of nuclear nonhistone proteins, low molecular weight nuclear RNA, and polytene chromosome structure. The regulation of gene expression in chick oviduct model system and the main features of lampbrush chromosomes are shown as well. Aside from the students and faculty of the above-mentioned university, this compilation will be invaluable as well to other undergraduate and graduate students; professors; and researchers. It will also be a good reference to those who are specializing in chromatin and chromosome studies.
Download or read book MicroRNAs written by Krishnarao Appasani and published by Cambridge University Press. This book was released on 2009-08-20 with total page 580 pages. Available in PDF, EPUB and Kindle. Book excerpt: MicroRNAs (miRNAs) are RNA molecules, conserved by evolution, that regulate gene expressions and their recent discovery is revolutionising both basic biomedical research and drug discovery. Expression levels of MiRNAs have been found to vary between tissues and with developmental stages and hence evaluation of the global expression of miRNAs potentially provides opportunities to identify regulatory points for many different biological processes. This wide-ranging reference work, written by leading experts from both academia and industry, will be an invaluable resource for all those wishing to use miRNA techniques in their own research, from graduate students, post-docs and researchers in academia to those working in R&D in biotechnology and pharmaceutical companies who need to understand this emerging technology. From the discovery of miRNAs and their functions to their detection and role in disease biology, this volume uniquely integrates the basic science with industry application towards drug validation, diagnostic and therapeutic development. Forewords by: Sidney Altman, Yale University, Winner of the Nobel Prize in Chemistry, 1989 and Victor R. Ambros, Dartmouth Medical School, Co-discoverer of MicroRNAs
Download or read book Intermediate Filament Proteins written by and published by Academic Press. This book was released on 2016-01-19 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Intermediate Filament Proteins, the latest volume in the Methods in Enzymology series covers all the intermediate filaments in vertebrates and invertebrates, providing a unique understanding of the multiple different tissue-specific intermediate filaments. This volume also covers the latest methods that are currently being used to study intermediate filament protein function and dynamics. It will be an important companion for any experimentalist interesting in studying this protein family in their cell or organism model system.
