Genomic Perspectives on Cell Fate Reprogramming in the Caenorhabditis Elegans Germline PDF Download
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Languages : en
Pages : 0
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In multicellular organisms, genetic programs guide cells to adopt particular cell fates as tissues are formed during development, maintained in adults and repaired after injury. Cell fates can also be reprogrammed artificially by genetic or chemical manipulation. In Caenorhabditis elegans, germ cell fate can be chemically reprogrammed: mutant puf-8; lip-1 adult hermaphrodites make sperm but can be switched to oocyte production by treatment with a MEK inhibitor. Such chemical reprogramming is uncommon: out of six genetically diverse sperm-only mutant backgrounds, only one other mutant could undergo chemical reprogramming, fbf-1; lip-1. Reprogramming "competence" thus depends on genotype. In addition, we show that two genes encoding PUF family member RNA-binding proteins, puf-8 and fbf-1, are redundantly required for chemical reprogramming of germ cell fate. Next, genomic analysis of reprogramming competent worms revealed an enrichment of oogenic mRNAs relative to mutants lacking the competence for chemical reprogramming. This intermediate state also existed at the protein level, since puf-8;lip-1 and fbf-1; lip-1 mutants expressed proteins diagnostic of both sperm and oocyte. Therefore reprogramming competent mutants possess an intersexual molecular profile at both RNA and protein levels. This intersexual molecular signature may poise the germline tissue for changing its cellular sexual state in response to environmental cues.
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Languages : en
Pages : 0
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Book Description
In multicellular organisms, genetic programs guide cells to adopt particular cell fates as tissues are formed during development, maintained in adults and repaired after injury. Cell fates can also be reprogrammed artificially by genetic or chemical manipulation. In Caenorhabditis elegans, germ cell fate can be chemically reprogrammed: mutant puf-8; lip-1 adult hermaphrodites make sperm but can be switched to oocyte production by treatment with a MEK inhibitor. Such chemical reprogramming is uncommon: out of six genetically diverse sperm-only mutant backgrounds, only one other mutant could undergo chemical reprogramming, fbf-1; lip-1. Reprogramming "competence" thus depends on genotype. In addition, we show that two genes encoding PUF family member RNA-binding proteins, puf-8 and fbf-1, are redundantly required for chemical reprogramming of germ cell fate. Next, genomic analysis of reprogramming competent worms revealed an enrichment of oogenic mRNAs relative to mutants lacking the competence for chemical reprogramming. This intermediate state also existed at the protein level, since puf-8;lip-1 and fbf-1; lip-1 mutants expressed proteins diagnostic of both sperm and oocyte. Therefore reprogramming competent mutants possess an intersexual molecular profile at both RNA and protein levels. This intersexual molecular signature may poise the germline tissue for changing its cellular sexual state in response to environmental cues.
Author: SRIVALLI MAMILLAPALLI
Publisher:
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Category :
Languages : en
Pages : 75
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The precise regulation of germ cell fates (sperm or oocyte) lies at the heart of reproduction and fertility. The nematode Caenorhabditis elegans hermaphrodites produce a discrete number of sperm during larval development and then switch to produce oocyte during adulthood. A number of positive (e.g., fbf genes) and negative (e.g., gld-3) regulators are important for this switch. Here, we found that aberrant activation of MPK-1 (an ERK homolog) by removal of both fbf-1 and lip-1 partially inhibits sperm-oocyte switch, resulting in Mog (masculinization of germline) sterility. The fbf-1 gene encodes a conserved PUF (Pumilio and FBF) RNA-binding protein and the lip-1 gene encodes an MPK-1/ERK phosphatase. Notably, inhibition of MPK-1/ERK signaling by either genetic mutation or chemical inhibition reprograms the germ cell fate and thus helps in regaining the fertility. We also found that fbf-1; lip-1 Mog sterility was enhanced by the depletion of G2/M cell cycle regulators, including CYB-3/Cyclin B, CDK-1/CDK1, and CDC-25.1/CDC25. Markedly, cdc-25.1 mRNA is a direct target of FBF-1. These results suggest that FBF-1 and LIP-1 may promote sperm-oocyte switch by activating MPK-1/ERK signaling and G2/M cell cycle progression.
Author: Carlos Simón
Publisher: Cambridge University Press
ISBN: 1107034477
Category : Medical
Languages : en
Pages : 199
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Book Description
Stem cell science has the potential to impact human reproductive medicine significantly - cutting edge technologies allow the production and regeneration of viable gametes from human stem cells offering potential to preciously infertile patients. Written by leading experts in the field Stem Cells in Reproductive Medicine brings together chapters on the genetics and epigenetics of both the male and female gametes as well as advice on the production and regeneration of gene cells in men and women, trophoblasts and endometrium from human embryonic and adult stem cells. Although focussing mainly on the practical elements of the use of stem cells in reproductive medicine, the book also contains a section on new developments in stem cell research. The book is essential reading for reproductive medicine clinicians, gynecologists and embryologists who want to keep abreast of practical developments in this rapidly developing field.
Author: Matthew H. Kaufman
Publisher: CUP Archive
ISBN: 9780521254496
Category : Nature
Languages : en
Pages : 296
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Book Description
Author: Sam Thiagalingam
Publisher: Cambridge University Press
ISBN: 0521493390
Category : Mathematics
Languages : en
Pages : 597
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Book Description
An overview of the current systems biology-based knowledge and the experimental approaches for deciphering the biological basis of cancer.
Author: National Academies of Sciences, Engineering, and Medicine
Publisher: National Academies Press
ISBN: 0309452880
Category : Medical
Languages : en
Pages : 329
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Book Description
Genome editing is a powerful new tool for making precise alterations to an organism's genetic material. Recent scientific advances have made genome editing more efficient, precise, and flexible than ever before. These advances have spurred an explosion of interest from around the globe in the possible ways in which genome editing can improve human health. The speed at which these technologies are being developed and applied has led many policymakers and stakeholders to express concern about whether appropriate systems are in place to govern these technologies and how and when the public should be engaged in these decisions. Human Genome Editing considers important questions about the human application of genome editing including: balancing potential benefits with unintended risks, governing the use of genome editing, incorporating societal values into clinical applications and policy decisions, and respecting the inevitable differences across nations and cultures that will shape how and whether to use these new technologies. This report proposes criteria for heritable germline editing, provides conclusions on the crucial need for public education and engagement, and presents 7 general principles for the governance of human genome editing.
Author: Florence Louise Marlow
Publisher: Morgan & Claypool Publishers
ISBN: 161504051X
Category : Family & Relationships
Languages : en
Pages : 221
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Book Description
Eggs of all animals contain mRNAs and proteins that are supplied to or deposited in the egg as it develops during oogenesis. These maternal gene products regulate all aspects of oocyte development, and an embryo fully relies on these maternal gene products for all aspects of its early development, including fertilization, transitions between meiotic and mitotic cell cycles, and activation of its own genome. Given the diverse processes required to produce a developmentally competent egg and embryo, it is not surprising that maternal gene products are not only essential for normal embryonic development but also for fertility. This review provides an overview of fundamental aspects of oocyte and early embryonic development and the interference and genetic approaches that have provided access to maternally regulated aspects of vertebrate development. Some of the pathways and molecules highlighted in this review, in particular, Bmps, Wnts, small GTPases, cytoskeletal components, and cell cycle regulators, are well known and are essential regulators of multiple aspects of animal development, including oogenesis, early embryogenesis, organogenesis, and reproductive fitness of the adult animal. Specific examples of developmental processes under maternal control and the essential proteins will be explored in each chapter, and where known conserved aspects or divergent roles for these maternal regulators of early vertebrate development will be discussed throughout this review. Table of Contents: Introduction / Oogenesis: From Germline Stem Cells to Germline Cysts / Oocyte Polarity and the Embryonic Axes: The Balbiani Body, an Ancient Oocyte Asymmetry / Preparing Developmentally Competent Eggs / Egg Activation / Blocking Polyspermy / Cleavage/ Mitosis: Going Multicellular / Maternal-Zygotic Transition / Reprogramming: Epigenetic Modifications and Zygotic Genome Activation / Dorsal-Ventral Axis Formation before Zygotic Genome Activation in Zebrafish and Frogs / Maternal TGF-β and the Dorsal-Ventral Embryonic Axis / Maternal Control After Zygotic Genome Activation / Compensation by Stable Maternal Proteins / Maternal Contributions to Germline Establishment or Maintenance / Perspective / Acknowledgments / References
Author: Henry F. Epstein
Publisher: Academic Press
ISBN: 0125641494
Category : Caenorhabditis elegans
Languages : en
Pages : 687
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Book Description
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.
Author: Kazuya Kobayashi
Publisher: Springer
ISBN: 4431566090
Category : Science
Languages : en
Pages : 783
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Book Description
This book provides new insights into the universality of biological systems in animal reproduction and development by a comparative study of a variety of mechanisms in animals ranging from basal invertebrates to vertebrates, including mammals. Animals accomplish genetic diversity through meiosis and fertilization, and during embryogenesis animals must produce specialized cell types, including germ cells, in accordance with their individual body plan. This series of phenomena is essential to the continuity of life in the animal kingdom, and animals show various reproductive and developmental strategies. This volume, comprising four parts, reviews animal kingdom diversity, including reproductive strategies and germ cell differentiation mechanisms (Part 1), sex determination and differentiation (Part2), the mechanisms of fertilization (Part 3), and body axis formation (Part 4). Readers will find descriptions of the reproduction or development of 180 species, 13 phyla, 35 classes, 74 orders, 117 families, and 151 genera in this book. Of particular interest is the diversity of molecules and mechanisms used to achieve the same biological purpose in different animals. Undergraduates, graduate students, and professional scientists who want a deeper understanding of animal reproductive and developmental mechanisms will find this book to be of great value.
Author: Babak Arjmand
Publisher: Springer Nature
ISBN: 3030277275
Category : Science
Languages : en
Pages : 199
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Book Description
This book provides thorough coverage of high-throughput OMICs technologies for the monitoring of stem cells and regenerative medicine. Specific topics covered include the genomics, proteomics, and metabolomics aspects of regenerative medicine, metabolic profiling of mesenchymal stem cells, genome profiling of mesenchymal stem cells, OMICs monitoring of stem cell-derived exosomes, stem cell proteomics, lipidomics, OMICs profiling of cancer (stem) cells, and finally ethical considerations of OMICs-based investigations. Chapters are authored by world-renowned scientists who have valuable expertise in the field of OMICs and regenerative medicine. Genomics, Proteomics, and Metabolomics: Stem Cells Monitoring in Regenerative Medicine, part of Springer’s Stem Cell Biology and Regenerative Medicine series, is essential reading for researchers, clinicians, biologists, biochemists, and pharmaceutical experts conducting research in the fields of stem cell biology, molecular aspects of stem cell research, tissue engineering, regenerative medicine, cellular therapy, OMICs, bioinformatics, and ethics.
