Chromatin

Chromatin

Author: Randall H. Morse

Publisher: Academic Press

Published: 2024-06-15

Total Pages: 586

ISBN-13: 0128148101

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Chromatin: Structure, Function, and History covers the basics of chromatin biology, beginning with the discoveries that culminated in the recognition of the nucleosome as the basic subunit of chromatin. Chromatin folding, nucleosome positioning, and histone variants are discussed, as well as research on chromatin modifications and remodeling, which exploded in the early to mid-1990s and led to widespread interest in epigenetics. Considerable attention is given to methods and experiments that led to key insights and recent developments such as the use of genome-wide approaches and innovations in imaging approaches are also emphasized. By providing historical background together with detailed discussion of contemporary studies, the book aims to instill in the reader an appreciation not only of our current knowledge of chromatin structure and function, but also of the remarkable path that has taken chromatin to the forefront of modern research. - Provides a current, expansive, and well-documented resource on chromatin and epigenetics - Addresses the role of chromatin in transcription regulation and chromatin abnormalities in disease - Reviews the historical background of specific areas of chromatin research, enabling readers to understand how the field was born and to appreciate the discoveries and technical advances that have propelled it forward


Chromatin Signaling and Diseases

Chromatin Signaling and Diseases

Author: Olivier Binda

Publisher: Academic Press

Published: 2016-08-06

Total Pages: 468

ISBN-13: 012802609X

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Chromatin Signaling and Diseases covers the molecular mechanisms that regulate gene expression, which govern everything from embryonic development, growth, and human pathologies associated with aging, such as cancer. This book helps researchers learn about or keep up with the quickly expanding field of chromatin signaling. After reading this book, clinicians will be more capable of explaining the mechanisms of gene expression regulation to their patients to reassure them about new drug developments that target chromatin signaling mechanisms. For example, several epigenetic drugs that act on chromatin signaling factors are in clinical trials or even approved for usage in cancer treatments, Alzheimer's, and Huntington's diseases. Other epigenetic drugs are in development to regulate various class of chromatin signaling factors. To keep up with this changing landscape, clinicians and doctors will need to stay familiar with genetic advances that translate to clinical practice, such as chromatin signaling. Although sequencing of the human genome was completed over a decade ago and its structure investigated for nearly half a century, molecular mechanisms that regulate gene expression remain largely misunderstood. An emerging concept called chromatin signaling proposes that small protein domains recognize chemical modifications on the genome scaffolding histone proteins, facilitating the nucleation of enzymatic complexes at specific loci that then open up or shut down the access to genetic information, thereby regulating gene expression. The addition and removal of chemical modifications on histones, as well as the proteins that specifically recognize these, is reviewed in Chromatin Signaling and Diseases. Finally, the impact of gene expression defects associated with malfunctioning chromatin signaling is also explored. - Explains molecular mechanisms that regulate gene expression, which governs everything from embryonic development, growth, and human pathologies associated with aging - Educates clinicians and researchers about chromatin signaling, a molecular mechanism that is changing our understanding of human pathology - Explores the addition and removal of chemical modifications on histones, the proteins that specifically recognize these, and the impact of gene expression defects associated with malfunctioning chromatin signaling - Helps researchers learn about the quickly expanding field of chromatin signaling


Repetitive DNA Sequences

Repetitive DNA Sequences

Author: Andrew G. Clark

Publisher: MDPI

Published: 2020-03-05

Total Pages: 206

ISBN-13: 3039283669

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Repetitive DNA is ubiquitous in eukaryotic genomes, and, in many species, comprises the bulk of the genome. Repeats include transposable elements that can self-mobilize and disperse around the genome, and tandemly-repeated satellite DNAs that increase in copy number due to replication slippage and unequal crossing over. Despite their abundance, repetitive DNA is often ignored in genomic studies due to technical challenges in their identification, assembly, and quantification. New technologies and methods are now providing the unprecedented power to analyze repetitive DNAs across diverse taxa. Repetitive DNA is of particular interest because it can represent distinct modes of genome evolution. Some repetitive DNA forms essential genome structures, such as telomeres and centromeres, which are required for proper chromosome maintenance and segregation, whereas others form piRNA clusters that regulate transposable elements; thus, these elements are expected to evolve under purifying selection. In contrast, other repeats evolve selfishly and produce genetic conflicts with their host species that drive adaptive evolution of host defense systems. However, the majority of repeats likely accumulate in eukaryotes in the absence of selection due to mechanisms of transposition and unequal crossing over. Even these neutral repeats may indirectly influence genome evolution as they reach high abundance. In this Special Issue, the contributing authors explore these questions from a range of perspectives.


A Clinician's Guide to Sperm DNA and Chromatin Damage

A Clinician's Guide to Sperm DNA and Chromatin Damage

Author: Armand Zini

Publisher: Springer

Published: 2018-03-05

Total Pages: 598

ISBN-13: 3319718150

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This comprehensive, up-to-date text, which brings together the key practical elements of the rapidly evolving field of sperm DNA and chromatin abnormalities, is divided thematically into five main sections. Part I discusses human sperm chromatin structure and nuclear architecture, while part II presents laboratory evaluation of sperm DNA damage, including SCSA, SCD, TUNEL and Comet assays, and cytochemical tests. Biological and clinical factors in the etiology of sperm DNA damage are discussed in part III, including oxidative stress, abortive apoptosis, cancer, and environmental and lifestyle factors. Part IV presents clinical studies on the utility of sperm DNA damage tests, both with natural and ART-assisted pregnancies, and debates the clinical utility of such tests. Finally, part V discusses current treatment options, such as antioxidant therapy, varicocelectomy, advanced sperm processing techniques and the use of testicular sperm. We are now beginning to better understand the unique organization of the sperm chromatin, as well as the nature and etiology of sperm DNA damage. Written and edited by worldwide experts in andrology, A Clinician's Guide to Sperm DNA and Chromatin Damage is an excellent resource for reproductive medicine and REI specialists, urologists, reproductive biologists and any professional working with the infertile male.


New Research on DNA Repair

New Research on DNA Repair

Author: Breehn R. Landseer

Publisher: Nova Publishers

Published: 2007

Total Pages: 412

ISBN-13: 9781600213854

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As a major defence against environmental damage to cells DNA repair is present in all organisms including bacteria, yeast, drosophila, fish, amphibians, rodents and humans. DNA repair is involved in processes that minimise cell killing, mutations, replication errors, persistence of DNA damage and genomic instability. Abnormalities in these processes have been implicated in cancer and ageing. This book presents leading-edge research from around the world in this frontal field.


Sperm Chromatin

Sperm Chromatin

Author: Armand Zini

Publisher: Springer Science & Business Media

Published: 2011-08-04

Total Pages: 515

ISBN-13: 1441968571

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Sperm DNA damage is common and has been associated with reduced rates of conception, impaired embryonic development and increased risk of miscarriage. Although the exact causes of sperm DNA damage are unknown, it is clear that infertile men possess substantially higher levels of sperm DNA damage than do fertile men. Written by leading, internationally renowned clinicians and basic scientists with expertise in sperm DNA, Sperm Chromatin: Biological and Clinical Applications in Male Infertility and Assisted Reproduction provides readers with a thoughtful and comprehensive review of the biological and clinical significance of sperm DNA damage. The work covers the fundamental principles of sperm chromatin architecture and function, the proposed modes of DNA damage and repair, the tests of sperm DNA damage, the clinical aspects of DNA damage and the impact of DNA damage on reproductive outcome. Unlike any other title on the topic, Sperm Chromatin: Biological and Clinical Applications in Male Infertility and Assisted Reproduction is an invaluable addition to the literature and will serve as an indispensable resource for basic scientists with an interest in sperm biology and for urologists, gynecologists, reproductive endocrinologists, and embryologists working in the field of infertility.


Evolution, Composition and Regulation of Supernumerary B Chromosomes

Evolution, Composition and Regulation of Supernumerary B Chromosomes

Author: Andreas Houben

Publisher: MDPI

Published: 2019-04-25

Total Pages: 254

ISBN-13: 3038977861

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Supernumerary B chromosomes (Bs) are dispensable genetic elements found in thousands of species of plants and animals, and some fungi. Since their discovery more than a century ago, they have been a source of puzzlement, as they only occur in some members of a population and are absent from others. When they do occur, they are often harmful, and in the absence of “selfishness”, based on mechanisms of mitotic and meiotic drive, there appears to be no obvious reason for their existence. Cytogeneticists have long wrestled with questions about the biological existence of these enigmatic elements, including their lack of any adaptive properties, apparent absence of functional genes, their origin, sequence organization, and co-evolution as nuclear parasites. Emerging new technologies are now enabling researchers to step up a gear, to look enthusiastically beyond the previous limits of the horizon, and to uncover the secrets of these “silent” chromosomes. This book provides a comprehensive guide to theoretical advancements in the field of B chromosome research in both animal and plant systems.


The Nuclear Envelope

The Nuclear Envelope

Author: David Evans

Publisher: Garland Science

Published: 2004-09-01

Total Pages: 320

ISBN-13: 0203643399

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The Nuclear Envelope brings together the major current topics in nuclear envelope structure, transport, transcriptional regulation and cell signaling. The volume is divided into four sections: 1. Proteins of the nuclear envelope, including nuclear envelope proteomics, structure and function. 2. Nuclear pores and transport at the nuclear envelope, including pore complex structure, assembly and function and import and export pathways. 3. Nuclear envelope dynamics, including dynamics of lamina assembly and disassembly. 4. Nuclear signaling and transcription regulation, including signaling to the nucleus and spectrin repeat proteins and their implications or communication between the nucleus and cytoplasm.


The Biological Bulletin

The Biological Bulletin

Author: Frank Rattray Lillie

Publisher:

Published: 1926

Total Pages: 1070

ISBN-13:

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Vols. 17, 21-105 contain Annual reports of the Marine Biological Laboratory for 1907/08-1952.