Molecular Architecture and Dynamics of Meiotic Chromosomes PDF Download
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Author: Ricardo Benavente
Publisher: Frontiers Media SA
ISBN: 2832546021
Category : Science
Languages : en
Pages : 227
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Book Description
Meiosis is a special type of cell division that allows the generation of haploid gametes and is a key process for sexual reproduction of animals, plants and fungi. Haploidization requires that meiotic cells undergo a series of unique processes; namely, pairing, synapsis, recombination and segregation of homologous chromosomes. This involves profound meiosis-specific changes in the protein composition and architecture of homologous chromosomes as well as of the condensation and folding of chromatin that require a critical timing and regulation. Despite this enormous complexity, different organisms may achieve haploidization through common molecular mechanisms. A major goal of this article collection is to provide an overview of how meiotic chromosomes and their components are critically involved in the mechanisms of haploidization and how dynamic protein complexes yield important structural intermediates and temporal regulation to this process. We welcome submissions of original articles, mini-reviews and review articles dealing with the composition, architecture, function and regulation of meiotic chromosomes of animals, plants and fungi using microscopic, biochemical, molecular, genetic and/or ‘omic’ techniques.
Author: Ricardo Benavente
Publisher: Frontiers Media SA
ISBN: 2832546021
Category : Science
Languages : en
Pages : 227
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Book Description
Meiosis is a special type of cell division that allows the generation of haploid gametes and is a key process for sexual reproduction of animals, plants and fungi. Haploidization requires that meiotic cells undergo a series of unique processes; namely, pairing, synapsis, recombination and segregation of homologous chromosomes. This involves profound meiosis-specific changes in the protein composition and architecture of homologous chromosomes as well as of the condensation and folding of chromatin that require a critical timing and regulation. Despite this enormous complexity, different organisms may achieve haploidization through common molecular mechanisms. A major goal of this article collection is to provide an overview of how meiotic chromosomes and their components are critically involved in the mechanisms of haploidization and how dynamic protein complexes yield important structural intermediates and temporal regulation to this process. We welcome submissions of original articles, mini-reviews and review articles dealing with the composition, architecture, function and regulation of meiotic chromosomes of animals, plants and fungi using microscopic, biochemical, molecular, genetic and/or ‘omic’ techniques.
Author: Ivana Novak
Publisher:
ISBN: 9789171409591
Category :
Languages : en
Pages : 52
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Book Description
Author: Katharina Schücker
Publisher:
ISBN:
Category :
Languages : en
Pages :
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Book Description
Author:
Publisher: Elsevier
ISBN: 0128201622
Category : Science
Languages : en
Pages : 390
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Book Description
Meiosis in Development and Disease, Volume 151 in the Current Topics in Developmental Biology series, highlights new advances in the field, with this new volume presenting interesting chapters on topics such as The initiation stages of meiosis, The molecular basis and dynamics of meiotic cohesions, and their significance in human infertility, Chromatin, recombination, and the centromeres, Sites and structures that mediate segregation when crossing over calls out sick/Life (or at Least Meiosis) Without Crossing Over, Crossover maturation inefficiency, Non coding RNA mediated gene regulation in meiosis, Short chromosomes in meiotic recombination, Chromatin level changes during meiosis initiation vs. oncogenesis, and much more. Other sections of note include Chromosomal speciation revisited: Meiotic recombination and synapsis of evolutionary diverged homologs, Recombination suppression at specific chromosome regions, Unwinding during stressful times - mechanisms of helicases in meiotic recombination, Meiotic functions of PCH-2/TRIP13 and HORMADs, Crossover interference, Checkpoint control in meiotic prophase: Idiosyncratic demands require unique characteristics, The breadth of meiotic drive genes and mechanisms across the tree of life, and many more interesting topics. Provides the authority and expertise of leading contributors from an international board of authors Presents the latest release in the Current Topics in Developmental Biology series Updated release includes the latest information on the Meiosis in Development and Disease
Author: Sarah Ur
Publisher:
ISBN:
Category :
Languages : en
Pages : 140
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Book Description
Meiosis, a hallmark of sexual reproduction, entails the division of one diploid parent cell into four haploid gamete daughter cells. To support proper chromosome segregation in two successive meiotic divisions, meiotic chromosomes must undergo dramatic structural changes in meiotic prophase to identify and pair with their corresponding homolog. This chromosomal structural rearrangement is accomplished through meiotic recombination, a process that inflicts double strand break damage on the chromosomes and necessitates their repair using their homologous sequence, in some cases forming an inter-homolog crossover. This work begins by reviewing meiotic chromosome structure, and how it supports meiotic recombination. In order to understand the structural context of meiotic recombination I begin by reviewing higher-order data on how entire chromosomes are packaged and ordered during meiosis then zoom into well-known structures such as the chromosome axis, the synaptonemal complex, and their individual protein components. The chapters on my experimental work begin by examining a Chromatin Binding Region (CBR) in the yeast meiotic HORMAD Hop1, a component of the chromosome axis. I demonstrate how the CBR is responsible for a secondary mode of chromosome axis deposition through its capability to bind directly nucleosomes. This secondary mechanism functions alongside a previously defined cohesin dependent chromosome axis assembly mechanism, and I hypothesize that this second mode of axis assembly enables crossover formation in an as-yet unknown manner. I next examine the Msh4-Msh5 complex in an attempt to define its role in shuttling double strand DNA breaks towards a crossover fate. Through careful biochemistry, I demonstrate that the preferred DNA substrate of the S. cerevisiae Msh4-Msh5 is a Holliday junction, and I identify the critical regions in both Msh4 and Msh5 for this activity. My last study aims to examine meiotic recombination from a larger perspective. In order to determine how individual proteins interplay on the chromatin throughout the process of meiotic prophase I, I developed a mass spectroscopy protocol to assay a meiotic time-course of S. cerevisiae chromosomes. With this protocol I created a spatial and temporal atlas of chromatin associated proteins, which details how proteins assemble and disassemble throughout meiotic prophase I. As a whole this thesis provides an extensive review of the field of meiotic chromosome architecture, defines molecular mechanisms of individual protein assembly during meiosis, and demonstrates the proteomic context for interhomolog recombination.
Author: Scott Keeney
Publisher: Humana Press
ISBN: 9781607611011
Category : Science
Languages : en
Pages : 372
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Book Description
Each generation in a sexually reproducing organism such as a fly or a mouse passes through the bottleneck of meiosis, which is the specialized cell division that gives rise to haploid reproductive cells (sperm, eggs, spores, etc. ). The principal function of meiosis is to reduce the genome complement by half, which is accomplished through sequential execution of one round of DNA replication followed by two rounds of chromosome segregation. Within the extended prophase between DNA replication and the first meiotic division in most organisms, homologous maternal and paternal chromosomes pair with one another and undergo homologous recombination, which establishes physical connections that link the homologous chromosomes until the time they are separated at anaphase I. Recombination also serves to increase genetic diversity from one generation to the next by breaking up linkage groups. The unique chromosome dynamics of meiosis have fascinated scientists for well over a century, but in recent years there has been an explosion of new information about how meiotic chromosomes pair, recombine, and are segregated. Progress has been driven by advances in three main areas: (1) genetic identification of meiosis-defective mutants and cloning of the genes involved; (2) development of direct physical assays for DNA intermediates and products of recombination; and (3) increasingly sophisticated cy- logical methods that describe chromosome behaviors and the spatial and temporal patterns by which specific proteins associate with meiotic chromosomes.
Author: Masuda Sharifi
Publisher:
ISBN:
Category :
Languages : en
Pages : 0
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Book Description
Meiosis is an important process for species survival and genetic diversity that promotes reproductive resilience. The process begins with diploid cells that undergo DNA replication followed by two rounds of cell division (meiosis I and meiosis II) to produce haploid gametes (sperm and egg). Inaccuracy in chromosome segregation results in aneuploidy, which is the cause of many developmental defects in humans. Zebrafish, Danio rerio, is an excellent vertebrate model organism to study key meiotic dynamics because the temporal and spatial transition of meiotic events all occur within the telomere bouquet hub-the site of homolog recognition, pairing and synapsis initiation. While it is known that the early stages of male and female meiotic prophase I are indistinguishable and characterized by polarized double stranded breaks (DSBs) formation, the relationship between sex-specific chromosome structural components and meiotic program modulation has not been extensively explored. Here I show that Rad21l1, a meiotic specific cohesin, does not function in the same pathway as Spo11, a protein required for DSBs formation to modulate the female meiotic program. Furthermore, I show that homologous chromosomes share a nonrandom distribution of cohesin, indicating that homologs can identify one another through complementary chromosome features at the protein level. These findings provide further insight into chromosome features and architecture promoting meiotic pairing and recombination.
Author: Wei Li
Publisher: Frontiers Media SA
ISBN: 2889741028
Category : Science
Languages : en
Pages : 427
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Book Description
Author: Rafael A. Fissore
Publisher: Frontiers Media SA
ISBN: 2889459446
Category :
Languages : en
Pages : 145
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Book Description
The Research Topic aims to support progress towards understanding the different sets of developmental processes that are absolutely required to complete all the steps essential for successful embryonic development, under physiological conditions. We sought contributions that dealt with single cells, interaction between cells as well as intra- and extracellular signal transduction. The Research Topic presents original studies covering experimental and theoretical approaches, descriptions of new methodologies, reviews and opinions.
Author: Oldenburg Oldenburg Press
Publisher:
ISBN: 9781523764426
Category :
Languages : en
Pages : 40
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Book Description
HiC-Pro is an optimized and flexible pipeline for processing Hi-C data from raw reads to normalized contact maps. HiC-Pro maps reads, detects valid ligation products, performs quality controls and generates intra- and inter-chromosomal contact maps. It includes a fast implementation of the iterative correction method and is based on a memory-efficient data format for Hi-C contact maps. In addition, HiC-Pro can use phased genotype data to build allele-specific contact maps. We applied HiC-Pro to different Hi-C datasets, demonstrating its ability to easily process large data in a reasonable time. Source code and documentation are available at http://github.com/nservant/HiC-Pro.
