Download or read book Mechanisms Controlling Cell Size in Animal Cells written by Shixuan Liu and published by . This book was released on 2019 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Although questions on cell size have been investigated for more than half a century, molecular mechanisms that 'program' the size of animal cells are only starting to be revealed. My Ph.D. research focuses on the molecular mechanisms that promote cell size uniformity in proliferating mammalian cells. By relying on a high-content small chemical screen, I identified candidate proteins and signaling molecules that may function as cell size specifiers. Intriguingly, analysis of the screen hits suggested a role for the p38 MAPK in the long-sought mammalian cell size checkpoint. In follow-up experiments, I showed that p38 MAPK signaling is activated in small, but not large cells, which selectively inhibits the progression of small cells into S phase. Consistent with this model, chemical and genetic perturbations of p38 resulted in the loss of the compensatory G1 length extension in small cells; cells lacking p38 activity proliferated faster, were smaller in size and displayed increased size heterogeneity. Altogether, my work suggests that the p38 MAPK pathway responds to changes in cell size and regulates G1 exit accordingly, to increase cell size uniformity. In this thesis, I first present an in-depth review of the animal cell size research. Reflecting on literature, I summarize in Chapter 1.1 a convergence of historical and recent evidence that support size sensing as a cell-autonomous function of individual animal cells. I also discuss the historical debates on animal cell size sensing and offer my understanding of how these "conflicting" literature may be resolved through new interpretations. In Chapter 1.2, I discuss in detail how cell size affects cellular, tissue and organismal level functions. I hope this inspires more functional and mechanistic research on cell size in the future. In the last Chapter, I further discuss the implications of the p38 signaling and cell size control and introduce in brief the branches of follow-up research that emerged from my thesis work.

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 Cell Growth written by Michael N. Hall and published by CSHL Press. This book was released on 2004 with total page 668 pages. Available in PDF, EPUB and Kindle. Book excerpt: Recent breakthroughs in the field of cell growth, particularly in the control of cell size, are reviewed by experts in the three major divisions of the field: growth of individual cells, growth of organs, and regulation of cell growth in the contexts of development and cell division. This book is an introductory overview of the field and should be adaptable as a textbook.

Download or read book Control Mechanisms in Animal Cells written by Luis Jimenez de Asua and published by Raven Press (ID). This book was released on 1980 with total page 416 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Control of Animal Cell Proliferation written by Alton L. Boynton and published by Elsevier. This book was released on 2013-09-24 with total page 576 pages. Available in PDF, EPUB and Kindle. Book excerpt: Control of Animal Cell Proliferation, Volume I presents how animals regulate their proliferation activity and how cells become proliferatively autonomous resulting in malignant behavior. This book provides an understanding of mechanisms that control animal cell proliferation. Organized into five parts encompassing 17 chapters, this volume begins with an overview of the efforts to elucidate he genetic alterations that lead normal cells to become cancer cells, which have been aided considerably by the investigation of acute retroviruses. This text then examines the factors involved in growth control. Other chapters describe in detail the biology and biochemistry of epidermal growth factor (EGF), which have been elucidated through the study of cultured human fibroblasts. This book discusses as well the protein kinases with specificity for tyrosine. The final chapter deals with regulation of initiation of eukaryotic protein synthesis by phosphorylation. This book is a valuable resource for scientists as well as cellular and molecular biologists.

Download or read book Cell size regulation Molecular mechanisms and physiological importance written by Evgeny Zatulovskiy and published by Frontiers Media SA. This book was released on 2023-06-08 with total page 145 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Cell Biology by the Numbers written by Ron Milo and published by Garland Science. This book was released on 2015-12-07 with total page 400 pages. Available in PDF, EPUB and Kindle. Book excerpt: A Top 25 CHOICE 2016 Title, and recipient of the CHOICE Outstanding Academic Title (OAT) Award. How much energy is released in ATP hydrolysis? How many mRNAs are in a cell? How genetically similar are two random people? What is faster, transcription or translation?Cell Biology by the Numbers explores these questions and dozens of others provid

Download or read book Size Control and Uniformity in Animal Cells written by Miriam Bracha Ginzberg and published by . This book was released on 2015 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Although mTORC1 activity, assayed by levels of mTORC1-target phosphorylation, increases abruptly during G1, it becomes correlated with cell size only upon G1 exit. The mTORC1 inhibitor rapamycin preferentially inhibits growth in S-phase cells. Taken together, these results indicate that the mTOR pathway maintains size homogeneity by stimulating growth in a cell-size-dependent manner after G1 exit. The screening and analysis methods developed here will be used to further elucidate the cellular size-control mechanism.

Download or read book The Plant Cell Cycle written by Dirk Inzé and published by Springer Science & Business Media. This book was released on 2011-06-27 with total page 240 pages. Available in PDF, EPUB and Kindle. Book excerpt: In recent years, the study of the plant cell cycle has become of major interest, not only to scientists working on cell division sensu strictu , but also to scientists dealing with plant hormones, development and environmental effects on growth. The book The Plant Cell Cycle is a very timely contribution to this exploding field. Outstanding contributors reviewed, not only knowledge on the most important classes of cell cycle regulators, but also summarized the various processes in which cell cycle control plays a pivotal role. The central role of the cell cycle makes this book an absolute must for plant molecular biologists.

Download or read book Cytokinesis in Animal Cells written by R. Rappaport and published by Cambridge University Press. This book was released on 2005-09-08 with total page 404 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book traces the history of some of the major ideas in the field and gives an account of our current knowledge of animal cytokinesis. It contains descriptions of division in different kinds of cells and the proposed explanations of the mechanisms underlying the visible events. The author also describes and explains experiments devised to test cell division theories. The forces necessary for cytokinesis now appear to originate from the interaction of linear polymers and motor molecules that have roles in force production, motion and shape change that occur in other phases of the biology of the cell. The localization of the force-producing mechanism to a restricted linear part of the subsurface is caused by the mitotic apparatus, the same cytoskeletal structure that insures orderly mitosis.

Download or read book Metabolic Control Mechanisms in Animal Cells Massachusetts 1963 written by National Cancer Institute (U.S.) and published by . This book was released on 1964 with total page 275 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Regulation of Cell Size and the Size Dependence of Gene Expression written by Devon Chandler-Brown and published by . This book was released on 2018 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Volume is a fundamental morphological feature of cells, influencing a wide variety of cellular processes. Because it is coupled to so many processes, cells employ regulatory mechanisms to ensure cells exhibit a limited range of sizes. Recent work in budding yeast has shown that a key cell cycle regulator, the G1/S transcriptional inhibitor Whi5, is synthesized independent of cell size. The dilution of Whi5 in larger cells links cell size to G1/S cell cycle progression. However, it has also been shown that growth over the full cell cycle does not depend on cell size at birth, termed an "adder". It has been proposed that this observation suggests that cell size is controlled over the course of the full cell cycle, leading to an apparent contradiction. Here we show that cell size control occurs independently in different parts of the cell cycle and does not reflect a molecular mechanism measuring growth during the full cell cycle. Consistent with previous results, we find that cell size sets the rate of entry into the cell cycle during the pre-Start period. We also identify the key parameters predicting the rate of entry into cytokinesis at the end of the post-Start period. We use these parameters to build a phenomenological cell cycle model that recapitulates observations of growth and size distributions for cells without explicit coupling between cell cycle phases. Our model predicts that changes to the rate of progression through either phase of the cell cycle should disrupt the adder behavior and we show that mutants in genes controlling G1/S size control breaks the adder. The rate of passage through Start depends on volume, which is thought to depend on the size-independent expression of Whi5. This type of gene expression scaling is unusual because although cells of a given type may span a range of sizes, most proteins and RNA are maintained at constant, size independent, concentrations, rather than amounts. This ensures that biochemical reactions proceed independently of cell size. The identification of WHI5, whose gene product differs from this pattern, raises two fundamental questions: (1) Are there additional genes whose synthesis is decoupled from cell volume? (2) If most gene expression is proportional to cell size, what molecular mechanism promotes cell-size-independent gene expression? To address these questions, we analyzed flow cytometry data collected using the yeast GFP-fusion library. We identified approximately 200 genes whose expression is not proportional to cell volume. Gene ontology analysis revealed that non-scaling genes are enriched for genes with roles in DNA-templated processes and membrane transport. This suggests that cells employ differential protein synthesis to coordinate protein requirements with the scaling properties of cellular structures. Membranes are expected to scale as size2/3 and DNA content is independent of size. To understand the mechanisms that underlie size-independent gene expression, we used transcriptional reporters of non-scaling genes, including WHI5, and determined that cell-size-independent regulation of some genes is due to non-scaling transcription rates. Targeted analysis of the WHI5 promoter showed that the region between 1000 bases and 550 bases upstream of the translation start site are required for cell-size-independent gene expression. This suggests there is a molecular element within this region required for non-scaling gene expression. Finally, we identify a partitioning mechanism ensuring proteins are partitioned in dividing cells in amounts that are independent of asymmetric sizes of the mother and daughter cells. Tight chromatin association ensures that proteins are segregated in equal amounts despite asymmetric division. Consistent with this model, while Whi5 is normally partitioned in equal amounts, a Whi5 protein that lacks the domain required for association with transcription factors is partitioned in proportion to the mother-daughter cell size ratio. Taken together, our work demonstrates a functional role for differential size-dependency of protein synthesis and gives insights into the underlying molecular mechanism(s).

Download or read book Why Size Matters written by John Tyler Bonner and published by Princeton University Press. This book was released on 2011-12-05 with total page 176 pages. Available in PDF, EPUB and Kindle. Book excerpt: Why size plays such a big role in the living world John Tyler Bonner, one of our most distinguished and creative biologists, here offers a completely new perspective on the role of size in biology. In his hallmark friendly style, he explores the universal impact of being the right size. By examining stories ranging from Alice in Wonderland to Gulliver's Travels, he shows that humans have always been fascinated by things big and small. Why then does size always reside on the fringes of science and never on the center stage? Why do biologists and others ponder size only when studying something else--running speed, life span, or metabolism? Why Size Matters, a pioneering book of big ideas in a compact size, gives size its due by presenting a profound yet lucid overview of what we know about its role in the living world. Bonner argues that size really does matter--that it is the supreme and universal determinant of what any organism can be and do. For example, because tiny creatures are subject primarily to forces of cohesion and larger beasts to gravity, a fly can easily walk up a wall, something we humans cannot even begin to imagine doing. Bonner introduces us to size through the giants and dwarfs of human, animal, and plant history and then explores questions including the physics of size as it affects biology, the evolution of size over geological time, and the role of size in the function and longevity of living things. As this elegantly written book shows, size affects life in its every aspect. It is a universal frame from which nothing escapes.

Download or read book The Plant Cytoskeleton written by Bo Liu and published by Springer Science & Business Media. This book was released on 2010-11-23 with total page 333 pages. Available in PDF, EPUB and Kindle. Book excerpt: Plant cells house highly dynamic cytoskeletal networks of microtubules and actin microfilaments. They constantly undergo remodeling to fulfill their roles in supporting cell division, enlargement, and differentiation. Following early studies on structural aspects of the networks, recent breakthroughs have connected them with more and more intracellular events essential for plant growth and development. Advanced technologies in cell biology (live-cell imaging in particular), molecular genetics, genomics, and proteomics have revolutionized this field of study. Stories summarized in this book may inspire enthusiastic scientists to pursue new directions toward understanding functions of the plant cytoskeleton. The Plant Cytoskeleton is divided into three sections: 1) Molecular Basis of the Plant Cytoskeleton; 2) Cytoskeletal Reorganization in Plant Cell Division; and 3) The Cytoskeleton in Plant Growth and Development. This book is aimed at serving as a resource for anyone who wishes to learn about the plant cytoskeleton beyond ordinary textbooks.

Download or read book Concepts of Biology written by Samantha Fowler and published by . This book was released on 2023-05-12 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Black & white print. Concepts of Biology is designed for the typical introductory biology course for nonmajors, covering standard scope and sequence requirements. The text includes interesting applications and conveys the major themes of biology, with content that is meaningful and easy to understand. The book is designed to demonstrate biology concepts and to promote scientific literacy.

Download or read book Cell Growth written by Michael N. Hall and published by CSHL Press. This book was released on 2004 with total page 672 pages. Available in PDF, EPUB and Kindle. Book excerpt: Recent breakthroughs in the field of cell growth, particularly in the control of cell size, are reviewed by experts in the three major divisions of the field: growth of individual cells, growth of organs, and regulation of cell growth in the contexts of development and cell division. This book is an introductory overview of the field and should be adaptable as a textbook.

Download or read book The Biology of the Cell Cycle written by J. M. Mitchison and published by CUP Archive. This book was released on 1971-11-30 with total page 324 pages. Available in PDF, EPUB and Kindle. Book excerpt: