Download or read book Nuclear Structure gene Expression Interrelationships written by Sheldon Penman and published by . This book was released on 1994 with total page 153 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Nuclear structure gene expression interrelationships written by and published by . This book was released on 1996 with total page 153 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Nuclear Structure and Gene Expression written by R. Curtis Bird and published by Elsevier. This book was released on 1996-11-28 with total page 317 pages. Available in PDF, EPUB and Kindle. Book excerpt: Nuclear Structure and Gene Expression assimilates the contributions of genome organization and of the components of the nuclear matrix to the control of DNA and RNA synthesis. Nuclear domains which accommodate DNA replication and gene expression are considered in relation to short-term developmental and homeostatic requirements as well as to long-term commitments to phenotypic gene expression in differentiated cells. Consideration is given to the involvement of nuclear structure in gene localization as well as to the targeting and concentration of transcription factors. Aberrations in nuclear architecture associated with and potentially functionally related to pathologies are evaluated. Tumor cells are described from the perspective of the striking modifications in both the composition and organization of nuclear components. Nuclear Structure and Gene Expression presents concepts as well as experimental approaches, which define functionality of nuclear morphology.* Mechanisms of interaction between nuclear structure and genes* Gene expression regulation by elements of the nuclear matrix* How nuclear structure exerts a regulatory effect on other aspects of cell function/physiology

Download or read book SPATIAL GENOME ORGANIZATION written by Narasimha Marella and published by . This book was released on 2009 with total page 203 pages. Available in PDF, EPUB and Kindle. Book excerpt: The mammalian genome is housed in a membrane bound organelle referred to as the nucleus. The three dimensional structural organization of the nucleus has been implicated to affect various genomic functions. Each chromosome in the interphase cell nuclei occupies a distinct region called the chromosome territory. Advances in cytogenetic techniques including fluorescence insitu hybridization and development of chromosome specific probes have allowed visualization of these individual territories within the interphase nuclei. The organization of the chromosome territories within the nuclear environment is highly debatable as it seems to be influenced by chromosome size or by gene density. Changes in the spatial organization of the chromosomes during differentiation and conservation of territorial associations within various tissue and cell types are also less understood aspects of genomic organization.^It is known that aberrations in the spatial and temporal organization of the genome leads to expression of disease phenotypes like cancer. However this phenomenon has been exemplified in only a few studies. In order to provide a deeper understanding of the above mentioned aspects of spatial genomic organization and its influence on gene regulation we have performed chromosome territory labeling experiments on a subset of six human chromosomes by adopting a RE-FISH (repeated fluorescence insitu hybridization) in a normal diploid human fibroblast (WI38) and a normal breast epithelial (MCF10A) cell line. We identified a tissue specific organization for these chromosomes within each of these cell lines by employing a novel computer graphing algorithm referred to as the generalized median graph (GMG). The radial positioning of the chromosomes showed a linear correlation with the chromosome size in both cell lines.^We were also able to measure the chromosome-chromosome associations for our subset of chromosomes using in house developed algorithms (Chapter 2). Our study on chromosome 18 and 19 organization during keratinocyte differentiation suggests significant stage specific shifts in chromosome territory spatial positions during differentiation (Chapter 3). We further extended our investigations on genome organization from chromosome territories to individual genes. FISH experiments were performed with individual cosmid probes as well as BAC probes to elucidate the organization of the human type I interferon gene cluster on metaphase chromosomes of the human osteosarcoma cell line (MG63) and normal diploid fibroblasts (Chapter 4). Both the cosmid and BAC probes consistently showed a six fold ladder-like genomic amplification of the interferon gene cluster on one chromosome in the MG63 cell line termed the `interferon chromosome'. This amplification was absent on WI38 metaphase chromosomes.^Comparative genomic hybridization (CGH) analysis also confirmed this gene amplification. We also found that centromere and whole chromosome regions of chromosomes 4 and 9 were interspersed with the amplified gene cluster on the interferon chromosome. Based on the results of our study, we propose a model involving the breakage- fusion -bridge theory for the generation of the interferon chromosome in the MG63 cell line (Chapter 4). Finally in this thesis, we investigate the relationship of alterations in spatial organization and genomic amplification to aberrant changes in gene expression in cancer. The MCF10A series of breast epithelial cell lines consisting of a normal MCF10A, premalignant MCF10At1 and malignant MCF10CA1a were utilized in these studies. Spectral Karyotyping (SKY) and CGH analyses were performed on all three cell lines. Two color gene expression analyses were carried out on mRNA isolated from normal MCF10A and malignant MCF10CA1a cell lines.^A total of 8000 genes were identified that showed at least two fold changes- either up or down regulated. Structural changes observed by CGH and SKY were correlated with the gene expression changes. Our results showed that a direct correlation between modifications in genomic structure and changes in gene expression does not exist in a majority of the observed genes (Chapter 5). Overall, the experiments done in this thesis highlight and explore the relationships between the spatial and temporal organization in the nucleus and its influence on genomic function.^The thesis is divided into the following six chapters:Chapter1: IntroductionChapter 2: Tissue specific chromosome organization in normal and cancer cell nuclei Chapter 3: Distinct changes in chromosome arrangements during human epidermal keratinocyte differentiation Chapter 4: Ladder-like amplification of the type I interferon gene cluster in the human osteosarcoma cell line MG63Chapter 5: Cytogenetic and functional analysis of breast cancer progression: Integration of spectral karyotyping, comparative genomic hybridization and cDNA microarray approachesChapter 6: Future Aims.

Download or read book Principles of Nuclear Structure and Function written by P. R. Cook and published by Wiley-Liss. This book was released on 2001-04-24 with total page 376 pages. Available in PDF, EPUB and Kindle. Book excerpt: The nucleus guides the life processes of the cell by directing cellular reproduction, differentiation during development, and metabolism. The study of the structure and function of the nucleus along with its genetic material serves as the foundation for the science of genetics. Principles of Nuclear Structure and Function provides a comprehensive overview of the cell nucleus by illustrating the connection between function and the architecture of the nucleus. Richly illustrated throughout, each chapter includes an overview, detailed examples, summary points, references, and callout boxes highlighting methods and cutting-edge technology. The appendix provides a useful list of related Web sites. Some of the subjects reviewed within Principles of Nuclear Structure and Function include: * Nuclear structure, replication, damage, and repair * Regulation of gene expression * The cell cycle * Meiosis and recombination This timely volume presents functional studies within their proper structural context and is an informative profile of the cell and molecular biology in nuclei and chromatin. For those studying cell biology, along with molecular and cell biologists, geneticists, and reproductive biologists, Principles of Nuclear Structure and Function is a definitive resource. Visit www.wiley.com/cook for supplementary information, including additional Web resources, downloadable figures, and discussion questions.

Download or read book Special Issue Nuclear Structure and Gene Expression written by and published by . This book was released on 2000 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Nuclear Structure and Gene Expression written by Gary S. Stein and published by . This book was released on 1999 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:

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 Nuclear Structure and Function written by J.R. Harris and published by Springer. This book was released on 2011-09-17 with total page 504 pages. Available in PDF, EPUB and Kindle. Book excerpt: This collection of 101 short communications, submitted by some of the participants at the 11th Nuclear Workshop held in Suzdal, USSR, 18-23 September, 1989, provides a representative survey of the material presented at the Workshop. Articles have been submitted by both those who delivered lectures and those who had poster presentations. The order of presentation at the Nuclear Workshop is roughly maintained within this proceedings book, but the session titles within the scientific program have not been utilized as discrete subdivisions within the book, because of the considerable overlap of subject matter. The overall sequence is as follows: Genome structure, Gene Structure and Expression, Nucleolar Genes, Structure and Proteins, Chromatin and Nuclear Granules, Nuclear Matrix and Nuclear Proteins, Replication and Transcription and finally Nuclear Envelope and Nuclear Cytoplasmic Transport. Several articles on Nuclear Lipids are also included, stemming from an evening round-table discussion on lipids. The third Wilhelm Bernhard Lecture was delivered in Suzdal by Professor Harris Busch, who can be seen in the photograph above (on the left) in the presence of Professor Ilya B. Zbarsky, President of the organizing committee for the 11th Nuclear Workshop. (Previous Wilhelm Bernhard lecturers have been Ronald H. Reeder, in Krakow, Poland, 1985 and Oscar L. Miller, Jr. , in Stevensbeek, The Netherlands, in 1987).

Download or read book Relationships Between Chromosome Structure and Long Distance Regulation of Gene Expression written by Kathryn Marie Donaldson and published by . This book was released on 2000 with total page 590 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Chromatin Structure Mediated Regulation of Nuclear Processes written by Min Kim and published by . This book was released on 2013 with total page 99 pages. Available in PDF, EPUB and Kindle. Book excerpt: Chromatin is a mixture of DNA and DNA binding proteins that control transcription. Dynamic chromatin structure modulates gene expression and is responsible for an extraordinary spectrum of developmental processes. An intricate interplay of DNA methylation, histone modifications, histone variants, small RNA accumulation, and ATPase chromatin remodelers defines chromatin re-configuration in a precise manner, locally within a cell and globally across different cell types. The development of high-throughput screening methods such as microarray and whole-genome sequencing has led to an explosion of chromatin studies in the past decade. Moreover, genetic and molecular studies resulted in identification of a number of proteins that may influence chromatin structure. However, the exact functions of individual proteins as well as their functional relationships to each other are less understood. Also, the role of chromatin components in establishing cell- and tissue-specific chromatin structure is largely unknown. To address these open questions in chromatin biology, I focused my dissertation work on 1) studying tissue-specific DNA demethylation in seed, and 2) determining the role of a ubiquitous DNA binding protein, linker histone H1, in regulating chromatin structure. Tissue specific DNA methylation in seed. In endosperm, the nutritive tissue that nourishes the embryo, parent-of-origin specific gene expression is regulated by DNA demethylation. However, the extent to which DNA demethylation occurs in a tissue-specific manner and regulates transcription in the endosperm of crop plants like rice remains unknown. To address these questions, my colleagues and I examined the DNA methylation patterns of two rice seed tissues, embryo and endosperm. We found that endosperm genome is globally hypomethylated at non-CG sites and locally hypomethylated at CG-sites compared to embryo. We also identified that small transposons near genes (euchromatic regions) are the primary targets of DNA demethylation. The loci near the genes preferentially expressed in endosperm (e.g. storage protein and starch synthesizing enzymes) are subjected to local hypomethylation, suggesting that DNA methylation plays a role in inducing tissue-specific genes in endosperm. The role of H1 in regulating chromatin structure. H1 is proposed to facilitate higher order chromatin structure, but its effects on individual chromatin components and transcription are less understood. To resolve this issue, we investigated the role of H1 in regulating DNA methylation, nucleosome positioning, and transcription. We identified that H1 was most enriched in transposons. H1 was also found in genes at a lower level compared to transposons, and the abundance of H1 was anticorrelated with gene expression. Moreover, H1 influences nucleosome positioning by increasing the distance between two nucleosomes. Lack of H1 resulted in increased DNA methylation of transposons with heterochromatic features. In contrast, an h1 mutant showed a reduction of DNA methylation in genes and transposons with euchromatic features. Our finding suggests that H1 has a dual function in regulating DNA methylation. That is, H1 inhibits both DNA methyltransferases and DNA demethylation-associated enzymes from binding heterochromatin and euchromatin, respectively. In addition, the hypermethylated loci in our h1 mutant almost perfectly overlapped with the hypomethylated loci in a ddm1 mutant in heterochromatin, suggesting a link between these two proteins. DDM1 is an Snf2 chromatin remodeler that can slide nucleosomes along DNA and has been proposed to provide DNA methyltransferase access to target sequences. We further determined their functional relationship by crossing h1 and ddm1 mutants, and generated a map of DNA methylation of the cross. We identified that loss of DNA methylation from ddm1 was partially recovered by removing H1. Also the mutant phenotype observed in ddm1 disappeared in h1ddm1. Based on our results, we proposed a model where DDM1-mediated chromatin destabilization releases H1 binding, which in turn increases DNA accessibility. It is noteworthy that DNA demethylation preferentially occurred in euchromatin in both the rice seed DNA methylation study and the H1 study. Based on this result, we proposed that the apparent target preference of DNA demethylation-associated proteins depends on the underlying chromatin structure. We think that this chromatin structure-mediated specificity also dictates other nucleoproteins to determine/recognize their targets. My dissertation work tackled multiple aspects of chromatin biology: tissue-specific chromatin regulation, and the interplay between chromatin components in chromatin organization. Together, the results from my work enhanced our knowledge of how chromatin components influence overall chromatin structure.

Download or read book Epigenetic Mechanisms of Gene Regulation written by Vincenzo E. A. Russo and published by . This book was released on 1996 with total page 716 pages. Available in PDF, EPUB and Kindle. Book excerpt: Many inheritable changes in gene function are not explained by changes in the DNA sequence. Such epigenetic mechanisms are known to influence gene function in most complex organisms and include effects such as transposon function, chromosome imprinting, yeast mating type switching and telomeric silencing. In recent years, epigenetic effects have become a major focus of research activity. This monograph, edited by three well-known biologists from different specialties, is the first to review and synthesize what is known about these effects across all species, particularly from a molecular perspective, and will be of interest to everyone in the fields of molecular biology and genetics.

Download or read book Nuclear Matrix written by Ronald Berezney and published by Elsevier. This book was released on 1995 with total page 1096 pages. Available in PDF, EPUB and Kindle. Book excerpt: Research on the nuclear matrix has grown enormously since Bereney and Coffey first reported its isolation and initial characterization in 1974. Since then, more than 1000 papers have been published on the subject by numerous workers around the world. This is the first book devoted to reviewing the major developments in this growing field. Key Features * The chapters cover a variety of topics, including: * Isolation of the nuclear matrix * Nuclear structure morphology in situ * Structural domains of the nuclear matrix and its components * Biochemistry and molecular biology of the matrix proteins and associated DNA and RNA * Functional properties associated with the nuclear matrix * DNA replication * Transcription * RNA splicing * Transcription regulation * Intranuclear and nucleocytoplasmic transport and targeting * Cell cycle regulation

Download or read book Epigenetics Nuclear Organization Gene Function written by John C. Lucchesi and published by Oxford University Press. This book was released on 2018-12-19 with total page 240 pages. Available in PDF, EPUB and Kindle. Book excerpt: Epigenetics is the study of heritable changes in gene function that do not involve changes in the DNA sequence. These changes, consisting principally of DNA methylation, histone modifications, and non-coding RNAs, maintain or modulate the initial impact of regulatory factors that recognize and associate with particular genomic sequences. Epigenetic modifications are manifest in all aspects of normal cellular differentiation and function, but they can also have damaging effects that result in pathologies such as cancer. Research is continuously uncovering the role of epigenetics in a variety of human disorders, providing new avenues for therapeutic interventions and advances in regenerative medicine. This book's primary goal is to establish a framework that can be used to understand the basis of epigenetic regulation and to appreciate both its derivation from genetics and interdependence with genetic mechanisms. A further aim is to highlight the role played by the three-dimensional organization of the genetic material itself (the complex of DNA, histones and non-histone proteins referred to as chromatin), and its distribution within a functionally compartmentalized nucleus. This architectural organization of the genome plays a major role in the subsequent retrieval, interpretation, and execution of both genetic and epigenetic information.

Download or read book Genome Structure and Function written by C. Nicolini and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 340 pages. Available in PDF, EPUB and Kindle. Book excerpt: Proceedings of the NATO Advanced Study Institute on Genome Structure and Function, held in Marciana Marina, Elba, Italy, 13-23 June 1996

Download or read book Nuclear Hormone Receptors written by Malcolm G. Parker and published by . This book was released on 1991 with total page 434 pages. Available in PDF, EPUB and Kindle. Book excerpt: An overview of the supergene family made up of those nuclear hormone receptors which recognize thyroid and steroid hormones, vitamen D and retinoic acid and which are characterized by their ability to bind both ligands and the genes which respond to them.

Download or read book Nuclear Architecture and Dynamics written by Christophe Lavelle and published by Academic Press. This book was released on 2017-10-27 with total page 620 pages. Available in PDF, EPUB and Kindle. Book excerpt: Nuclear Architecture and Dynamics provides a definitive resource for (bio)physicists and molecular and cellular biologists whose research involves an understanding of the organization of the genome and the mechanisms of its proper reading, maintenance, and replication by the cell. This book brings together the biochemical and physical characteristics of genome organization, providing a relevant framework in which to interpret the control of gene expression and cell differentiation. It includes work from a group of international experts, including biologists, physicists, mathematicians, and bioinformaticians who have come together for a comprehensive presentation of the current developments in the nuclear dynamics and architecture field. The book provides the uninitiated with an entry point to a highly dynamic, but complex issue, and the expert with an opportunity to have a fresh look at the viewpoints advocated by researchers from different disciplines. - Highlights the link between the (bio)chemistry and the (bio)physics of chromatin - Deciphers the complex interplay between numerous biochemical factors at task in the nucleus and the physical state of chromatin - Provides a collective view of the field by a large, diverse group of authors with both physics and biology backgrounds