Download or read book Regulation of Ribosome Biogenesis and Rna Polymerase I Transcription written by Robert Steinbauer and published by Sudwestdeutscher Verlag Fur Hochschulschriften AG. This book was released on 2011-06 with total page 148 pages. Available in PDF, EPUB and Kindle. Book excerpt: Ribosome synthesis depends on nutrient availability sensed by the target of rapamycin (TOR) signaling pathway in eukaryotic cells. TOR inactivation affects ribosome biogenesis at the level of RNA polymerase I (Pol I)-dependent transcription of ribosomal RNA (rRNA) genes, expression of ribosomal proteins (r-proteins) and ribosome biogenesis factors, pre-ribosome processing, and transport. Detailed analysis shows that upon TOR inactivation the levels of newly synthesized ribosomal subunits drop drastically before the integrity of the Pol I apparatus is severely impaired but in good correlation with a sharp decrease in r-protein production. Inhibition of translation by cycloheximide mimics the rRNA maturation defect observed immediately after TOR inactivation. Both cycloheximide addition and the depletion of individual r-proteins also reproduce TOR-dependent nucleolar entrapment of specific ribosomal precursor complexes. The conclusion could be drawn that shortage of newly synthesized r-proteins after short-term TOR inactivation is sufficient to explain most of the observed effects on ribosome production.
Download or read book Growth dependent Regulation of Ribosome Biogenesis and the Role of Rrn3p in RNA Polymerase I Transcription written by Robert Steinbauer and published by . This book was released on 2010 with total page 137 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Emerging Concepts in Ribosome Structure Biogenesis and Function written by Vijay Kumar and published by Academic Press. This book was released on 2021-09-25 with total page 298 pages. Available in PDF, EPUB and Kindle. Book excerpt: Ribosome biogenesis is the process of making ribosomes which are responsible for mRNA translation into proteins. It is a tightly regulated process closely linked to nearly all biochemical and cellular processes, including cell division, growth, and development. Emerging Concepts in Ribosome Structure, Biogenesis, and Function provides a synthesized overview of all the parts engaged in this process. The book begins by providing an introduction to the ribosome factory, its origin, and its evolution of translation. It then goes on to describe ribosome structure including subunits, RNA, and protein components. Ribosome biogenesis and its emergence as a frontier research area for translational potential in cancer and other diseases are also discussed. In addition, the book explores current developments in ribosome research like the emergence of ribosomopathies, how deregulation of ribosome biogenesis can impact disease mechanisms and aging, and the discovery of specialized ribosomes that have specific functions that may translate differentially with consequences on normal and pathological processes. Emerging Concepts in Ribosome Structure, Biogenesis, and Function provides fundamental coverage and emerging research on ribosomes, biogenesis, and their structure and function and is a resourceful introduction for new researchers and those engaged in interdisciplinary ribosomal research. Provides an overview of ribosome biogenesis and examines its involvement in cell transformation and cancerous growth Covers disorders related to the ribosome (ribosomopathies) and explains the significance of ribosome dysfunction in human diseases Includes commonly used methods to study ribosomes, such as polysome preparation, RNA profiling and proteomics, CryoEM, and Cell-free assays along with proper illustrations
Download or read book The Nucleolus and Ribosome Biogenesis written by A.A. Hadjiolov and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 281 pages. Available in PDF, EPUB and Kindle. Book excerpt: The nucleolus had consistently attracted the attention of investigators in the fields of cell biology and pathology. Because of its ubiquitous presence in the nucleus of eukaryotic cells, its rapid changes during their life cycle, and its rapid response to noxious agents, this organelle has been the subject of a large number of studies. Yet, the exact function and the very reason for the existence of the nucleolus (the only large cellular structure not delimited by a membrane) remain largely unknown. The ribosomes were discovered relatively late in the study of cells, but due to their crucial involvement in the protein synthesis machinery of all living organisms, the elucidation of their structure and function quickly became one of the major goals of molecular biology. The relatively simple structure of the ribosome strengthens the hope that a full understanding of the structure and function of this organelle in molecular terms is within the reach of contemporary research~ Since each of the rRNA and protein molecules embodied in the ribosome is the product of a distinct gene, studies on the biogenesis of ribosomes expanded rapidly to become a core topic in molecular genetics.
Download or read book Non coding RNAs and Cancer written by Muller Fabbri and published by Springer Science & Business Media. This book was released on 2013-10-28 with total page 287 pages. Available in PDF, EPUB and Kindle. Book excerpt: The discovery of microRNAs and its role as gene expression regulators in human carcinogenesis represents one of the most important scientific achievements of the last decade. More recently, other non-coding RNAs have been discovered and its implications in cancer are emerging as well, suggesting a broader than anticipated involvement of the non-coding genome in cancer. Moreover, completely new and unexpected functions for microRNAs are being revealed, leading to the identification of new anticancer molecular targets. This book represents a comprehensive guide on non-coding RNAs and cancer, spanning from its role as cancer biomarkers, to providing the most useful bioinformatic tools, to presenting some of the most relevant discoveries, which indicates how these fascinating molecules act as fine orchestrators of cancer biology.
Download or read book Ribosome Biogenesis written by Karl-Dieter Entian and published by Springer Nature. This book was released on 2022-07-07 with total page 287 pages. Available in PDF, EPUB and Kindle. Book excerpt: This Open Access volume provides comprehensive reviews and describes the latest techniques to study eukaryotic ribosome biogenesis. For more than 50 years ribosomes are a major research topic. Our knowledge about ribosome biogenesis and function such as transcription, mRNA modification, and translation was the sine qua non for developing the powerful RNA-based vaccines against RNA-viruses causing the world-threatening Covid-19 pandemia. The chapters in this book are organized into six parts. Part One discusses a comparative survey about the unity and diversity of ribosome biogenesis in pro- and eukaryotic cells. Part Two deals with the genomic organization of eukaryotic rDNA and the role of RNA polymerase I in ribosomal RNA transcription. Part Three explores in vitro methods to study RNA polymerase I structure and its function, and Part Four analyzes the nucleo-cytoplasmic transport of assembled ribosomes and RNP complexes. Part Five covers modifications that increase the complexity of rRNAs, and Part Six provides readers with a review of eukaryotic translation and - for the first time - describes a new method to analyze translation in vitro. Written in the highly successful Methods in Molecular Biology series format, chapters include introductions to their respective topics, lists of the necessary materials and reagents, step-by-step, readily reproducible laboratory protocols, and tips on troubleshooting and avoiding known pitfalls. Cutting-edge and comprehensive, Ribosome Biogenesis: Methods and Protocols is a valuable resource for scientists and researchers interested in learning more about the increasing importance of in vitro RNA-technologies.
Download or read book The Nucleolus written by Mark O. J. Olson and published by Springer Science & Business Media. This book was released on 2011-09-15 with total page 434 pages. Available in PDF, EPUB and Kindle. Book excerpt: Within the past two decades, extraordinary new functions for the nucleolus have begun to appear, giving the field a new vitality and generating renewed excitement and interest. These new discoveries include both newly-discovered functions and aspects of its conventional role. The Nucleolus is divided into three parts: nucleolar structure and organization, the role of the nucleolus in ribosome biogenesis, and novel functions of the nucleolus.
Download or read book Relative Roles of UBF and RRN3 in the Transcription of the Ribosomal RNA Genes and Ribosome Biogenesis Determined Using in Vivo Mouse Models written by Chelsea Herdman and published by . This book was released on 2017 with total page 177 pages. Available in PDF, EPUB and Kindle. Book excerpt: Ribosome biogenesis, or the synthesis of ribosomes, is an important cell process occurring in the nucleolus that utilizes transcription by all three nuclear RNA polymerases. The initial and rate-limiting step is the transcription of the catalytic ribosomal RNAs 28S, 18S and 5.8S in the form of a precursor ribosomal RNA (pre-rRNA/47S) by RNA polymerase I (RPI, also known as Pol1 and POLR1). RPI has a dedicated set of basal factors responsible for its activation. These are the architectural factor UBF, the TBP containing factor SL1, the initiation factor RRN3, and the termination factor TTF1. Ribosomal RNA synthesis is tightly regulated and accounts for 30-50% of total gene transcription. As such, this process is linked to cell growth, transformation, proliferation and the actions of tumour suppressors and oncogenes. Notably, UBF and RRN3 are activated by many of the same growth signaling pathways. The human and mouse haploid genome contain ~200 copies of the ribosomal RNA genes, the ribosomal DNA (rDNA). These ribosomal DNA copies are arranged in tandem repeats on the short arms of acrocentric chromosomes. Interestingly, only a fraction of the rDNA copies are active, and a significant number are epigenetically silenced and heterochromatic. The reason for having so many copies and their regulation in vivo by silencing is not yet understood, though it has been connected with genome stability. This thesis presents the analysis of the in vivo requirements for UBF and RRN3 in rRNA transcription and rDNA chromatin structure. We had previously analyzed the loss of UBF in mouse embryonic fibroblasts using tamoxifen-dependent conditional knockout. As we wanted to compare the loss of RRN3 in a similar model, we re-analyzed the RRN3 knockout mice and created cell lines as was performed for the UBF knockout. Importantly, we find that RRN3 is essential for preimplantation and its loss arrests development at E3.5, contrary to previous work that showed a late E9.5 developmental arrest. Using mouse embryonic fibroblast (MEF) cell lines conditional for UBF or RRN3, we found that the loss of either factor prevented RPI transcription. However, we found that UBF was essential for the recruitment of the other RPI transcription factors and the formation of the preinitiation complex, as well as to maintain an open rDNA chromatin structure, while RRN3 was required only for RPI recruitment. These studies allowed us to identify an upstream boundary element on the rDNA formed of H2A.Z, TTF1, CTCF and activating histone marks, which is independent of RPI activity. We also found that UBF loss, but not RRN3 loss, led to a synchronous and massive p53-independent apoptosis, specifically in oncogenically transformed cells. This strongly suggests that drug targeting UBF could be a viable cancer treatment. Finally, we have observed that the rDNA activity status in pluripotent cells differs from that of differentiated cells. Embryonic stem cells (ESCs) were also generated from the mice conditional for UBF and RRN3. Preliminary results indicate that, unlike somatic cells, all the rRNA genes in these and other pluripotent cell lines are potentially active. This makes ESCs and their differentiation an ideal model in which to study the establishment of rDNA silencing and the role of UBF and/or RRN3 in this process. Together these data define the in vivo roles of UBF and RRN3 in ribosomal RNA transcription and suggest mechanisms by which they maintain rDNA integrity and may drive cell differentiation.
Download or read book Transcription of Ribosomal RNA Genes by Eukaryotic RNA Polymerase I written by Marvin R. Paule and published by Springer. This book was released on 1998-10-06 with total page 350 pages. Available in PDF, EPUB and Kindle. Book excerpt: The mechanism by which ribosomal RNA is synthesized has been a topic of intensive research for nearly 30 years. In 1981 the first in vitro transcription system for ribosomal RNA from a eukaryote - mouse ascites cells - was reported, followed rapidly by similar systems in a variety of other eukaryotes, all revealed by a relatively small number of research groups. This monograph is the first to bring together the results and opinions of all these groups. Though it unavoidably emphasizes the common features of ribosomal RNA transcription between species, the species specificity of the process and nucleolar dominance and its possible mechanism(s) are also discussed.
Download or read book Ubiquitin mediated Regulation of RNA Polymerase I in Saccharomyces Cerevisiae written by Sabrina Kamran and published by . This book was released on 2019 with total page 95 pages. Available in PDF, EPUB and Kindle. Book excerpt: Ribosomes are key cellular components ensuring that cells correctly synthesize their protein cohort. Dysregulation of this process can lead to improper cell growth and is linked to the progression of several types of cancers, making understanding of this process of great interest to both researchers and clinicians. Ribosome biogenesis, the process by which ribosomes are produced, is largely controlled by regulating the rate-limiting step of rDNA transcription by RNA Polymerase I, which transcribes three of the four ribosomal RNAs within the cell. Although rDNA transcription is highly regulated by post-translational modifications in response to changing environmental conditions, little is known of how RNA Polymerase I activity is regulated. Our previous research identified a novel role for ubiquitin-mediated regulation of RNA Polymerase I in ribosome biogenesis. We discovered that ubiquitination of Rpa190, the largest subunit of RNA polymerase I, regulates growth and is modulated by the deubiquitinating enzyme Ubp10. This thesis explores the details of Rpa190 ubiquitination and provides an understanding of how ubiquitination regulates rDNA transcription using both genetic and pharmacological approaches. First, it identifies how ubiquitination of Rpa190 modulates active rDNA transcription. It also identifies the SCF[superscript]Grr1 complex as a potential upstream ubiquitin pathway that regulates ribosome biogenesis. Second, it identifies that the ubiquitination of Rpa190 likely serves as the physiological axis affected by the pharmacology of BMH-21, a novel small molecule being considered for use as an anti-cancer therapeutic.
Download or read book Archaeal Ribosomes Biogenesis Structure and Function written by Paola Londei and published by Frontiers Media SA. This book was released on 2022-01-24 with total page 164 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book The Liver written by Irwin M. Arias and published by John Wiley & Sons. This book was released on 2020-03-09 with total page 1156 pages. Available in PDF, EPUB and Kindle. Book excerpt: Bridging the gap between basic scientific advances and the understanding of liver disease — the extensively revised new edition of the premier text in the field. The latest edition of The Liver: Biology and Pathobiology remains a definitive volume in the field of hepatology, relating advances in biomedical sciences and engineering to understanding of liver structure, function, and disease pathology and treatment. Contributions from leading researchers examine the cell biology of the liver, the pathobiology of liver disease, the liver’s growth, regeneration, metabolic functions, and more. Now in its sixth edition, this classic text has been exhaustively revised to reflect new discoveries in biology and their influence on diagnosing, managing, and preventing liver disease. Seventy new chapters — including substantial original sections on liver cancer and groundbreaking advances that will have significant impact on hepatology — provide comprehensive, fully up-to-date coverage of both the current state and future direction of hepatology. Topics include liver RNA structure and function, gene editing, single-cell and single-molecule genomic analyses, the molecular biology of hepatitis, drug interactions and engineered drug design, and liver disease mechanisms and therapies. Edited by globally-recognized experts in the field, this authoritative volume: Relates molecular physiology to understanding disease pathology and treatment Links the science and pathology of the liver to practical clinical applications Features 16 new “Horizons” chapters that explore new and emerging science and technology Includes plentiful full-color illustrations and figures The Liver: Biology and Pathobiology, Sixth Edition is an indispensable resource for practicing and trainee hepatologists, gastroenterologists, hepatobiliary and liver transplant surgeons, and researchers and scientists in areas including hepatology, cell and molecular biology, virology, and drug metabolism.
Download or read book Craniofacial Development written by Peter Thorogood and published by . This book was released on 1988 with total page 274 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Regulation of Ribosomal Protein and Ribosomal RNA Synthesis in Escherichia Coli written by Sue Jinks Robertson and published by . This book was released on 1983 with total page 464 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Plant Epigenetics written by Nikolaus Rajewsky and published by Springer. This book was released on 2017-04-27 with total page 540 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book presents, in 26 chapters, the status quo in epigenomic profiling. It discusses how functional information can be indirectly inferred and describes the new approaches that promise functional answers, collectively referred to as epigenome editing. It highlights the latest important advances in our understanding of the functions of plant epigenomics and new technologies for the study of epigenomic marks and mechanisms in plants. Topics include the deposition or removal of chromatin modifications and histone variants, the role of epigenetics in development and response to environmental signals, natural variation and ecology, as well as applications for epigenetics in crop improvement. Discussing areas ranging from the complex regulation of stress and heterosis to the precise mechanisms of DNA and histone modifications, it presents breakthroughs in our understanding of complex phenotypic phenomena.
Download or read book Germline Stem Cells written by Michael Buszczak and published by Humana. This book was released on 2016-10-13 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: This second edition provides updated and new chapters on selected genetic, molecular, biochemical, and cell biological techniques. Chapter’s guide readers through methods and principles on primordial germ cells and germline stem cells, however many of these principles can be applied to different types of adult stem cells. Written in the highly successful Methods in Molecular Biology series format, chapters include introductions to their respective topics, lists of the necessary materials and reagents, step-by-step, readily reproducible laboratory protocols, and tips on troubleshooting and avoiding known pitfalls. Authoritative and cutting-edge, Germline Stem Cells: Second Edition aims to present the new findings and techniques that have developed since the first edition.
Download or read book Fungal RNA Biology written by Ane Sesma and published by Springer Science & Business Media. This book was released on 2014-04-15 with total page 396 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book presents an overview of the RNA networks controlling gene expression in fungi highlighting the remaining questions and future challenges in this area. It covers several aspects of the RNA-mediated mechanisms that regulate gene expression in model yeasts and filamentous fungi, organisms of great importance for industry, medicine and agriculture. It is estimated that there are more than one million fungal species on the Earth. Despite their diversity (saprophytic, parasitic and mutualistic), fungi share common features distinctive from plants and animals and have been grouped taxonomically as an independent eukaryotic kingdom. In this book, 15 chapters written by experts in their fields cover the RNA-dependent processes that take place in a fungal cell ranging from formation of coding and non-coding RNAs to mRNA translation, ribosomal RNA biogenesis, gene silencing, RNA editing and epigenetic regulation.
