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The coordinated action of the different cytoskeletal polymers--microtubules, actin filaments and neurofilaments-- is essential for the establishment, remodeling and maintenance of neuronal architecture throughout the neuron lifetime. Neurons are among the most polarized cells, with a long thin axon and multiple thicker and shorter dendrites. Achieving this complex morphology, and the precise and accurate formation of an intricate network of synaptic contacts is critical for the proper transmission and reception of signals in the brain. Neuronal polarization precedes axon outgrowth and the subsequent differentiation of short neurites into dendrites, as part of the neuronal differentiation program that involves both intrinsic and extrinsic signals that converge at the cytoskeletal level. Growth cones, which are sensory and locomotor structures located at the tip of growing axons, are key elements in the transduction of extracellular cues into cytoskeletal changes, guiding axons to their right destinations. Neuronal migration, another crucial process during brain development, occurs in close coordination with neuronal differentiation. Migration involves as well an extensive rearrangement of neuronal cell shape that relies on cytoskeleton reorganization. Further processes, such as dendritic spine formation and growth, establishment of synaptic contacts or synaptic plasticity in mature neurons also depend on cytoskeletal dynamics. Fine-tune regulation of neuronal cytoskeleton is therefore crucial for the maintenance of neuronal integrity and functionality. Mutations in genes that code for cytoskeletal proteins often have deleterious effects in neurons, such as abnormal migration or differentiation, deficient axonal transport of organelles and synaptic vesicles, or impaired synaptic signaling. Several human Nervous System disorders, including neurodevelopmental, psychiatric, and neurodegenerative diseases, have been linked to cytoskeletal dysfunction. Cytoskeletal reorganization is also crucial to regulate nerve cell repair following Nervous System injury. Many of the pathways that control cell-intrinsic axon regeneration lead to axon cytoskeletal remodeling. Moreover, most extracellular cues that inhibit regeneration of damaged axons in Central Nervous System following traumatic injury or neurodegeneration, are known to modulate cytoskeletal dynamics and organization. Based on these findings, regulators of cytoskeleton dynamics have emerged as promising therapeutic targets in several brain disorders and in the context of regeneration of injured axons. Hence, remodeling of neuronal cytoskeleton underlies all the dramatic morphological changes that occur in developing and adult neurons. Understanding the specific molecular mechanisms that control cytoskeleton rearrangements in neurons is far from complete. This Frontiers Research Topic gathers a selection of articles focused on the diverse and key roles of cytoskeleton in neuronal biology.

Science: general issues --- Neurosciences --- neuronal cytoskeleton --- astrocyte cytoskeleton --- microtubules (MTs) --- actin cytoskeleton --- tau --- neuron

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Actin --- Tumors --- Respiratory infections --- Actomyosin --- Respiratory organs --- Respiratory tract infections --- Upper respiratory infections --- Upper respiratory tract infections --- Infection --- Neoplasms --- Tumours --- Pathology --- Cysts (Pathology) --- Oncology --- Physiology. --- Ultrastructure. --- Pathophysiology. --- Infections --- Diseases --- Actins

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“Symmetry Breaking in Cells and Tissues” presents a collection of seventeen reviews, opinions and original research papers contributed by theoreticians, physicists and mathematicians, as well as experimental biologists, united by a common interest in biological pattern formation and morphogenesis. The contributors discuss diverse manifestations of symmetry breaking in biology and showcase recent developments in experimental and theoretical approaches to biological morphogenesis and pattern formation on multiple scales.

Research & information: general --- Biology, life sciences --- actin waves --- curved proteins --- dynamic instability --- podosomes --- diffusion --- cell polarity --- Cdc42 --- stress --- cellular memory --- phase separation --- prions --- apoptotic extrusion --- oncogenic extrusion --- contractility --- actomyosin --- bottom-up synthetic biology --- motor proteins --- pattern formation --- self-organization --- cell motility --- signal transduction --- actin dynamics --- intracellular waves --- polarization --- direction sensing --- symmetry-breaking --- biphasic responses --- reaction-diffusion --- membrane and cortical tension --- cell fusion --- cortexillin --- cytokinesis --- Dictyostelium --- myosin --- symmetry breaking --- cytoplasmic flow --- phase-space analysis --- nonlinear waves --- actin polymerization --- bifurcation theory --- mass conservation --- spatial localization --- activator–inhibitor models --- developmental transitions --- cell polarization --- mathematical model --- fission yeast --- reaction–diffusion model --- small GTPases --- Cdc42 oscillations --- pseudopod --- Ras activation --- cytoskeleton --- chemotaxis --- neutrophils --- natural variation --- modelling --- activator-substrate mechanism --- mass-conserved models --- intracellular polarization --- partial differential equations --- sensitivity analysis --- GTPase activating protein (GAP) --- fission yeast Schizosaccharomyces pombe --- CRY2-CIBN --- optogenetics --- clustering --- positive feedback --- network evolution --- Saccharomyces cerevisiae --- polarity --- modularity --- neutrality --- n/a

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“Symmetry Breaking in Cells and Tissues” presents a collection of seventeen reviews, opinions and original research papers contributed by theoreticians, physicists and mathematicians, as well as experimental biologists, united by a common interest in biological pattern formation and morphogenesis. The contributors discuss diverse manifestations of symmetry breaking in biology and showcase recent developments in experimental and theoretical approaches to biological morphogenesis and pattern formation on multiple scales.

Research & information: general --- Biology, life sciences --- actin waves --- curved proteins --- dynamic instability --- podosomes --- diffusion --- cell polarity --- Cdc42 --- stress --- cellular memory --- phase separation --- prions --- apoptotic extrusion --- oncogenic extrusion --- contractility --- actomyosin --- bottom-up synthetic biology --- motor proteins --- pattern formation --- self-organization --- cell motility --- signal transduction --- actin dynamics --- intracellular waves --- polarization --- direction sensing --- symmetry-breaking --- biphasic responses --- reaction-diffusion --- membrane and cortical tension --- cell fusion --- cortexillin --- cytokinesis --- Dictyostelium --- myosin --- symmetry breaking --- cytoplasmic flow --- phase-space analysis --- nonlinear waves --- actin polymerization --- bifurcation theory --- mass conservation --- spatial localization --- activator–inhibitor models --- developmental transitions --- cell polarization --- mathematical model --- fission yeast --- reaction–diffusion model --- small GTPases --- Cdc42 oscillations --- pseudopod --- Ras activation --- cytoskeleton --- chemotaxis --- neutrophils --- natural variation --- modelling --- activator-substrate mechanism --- mass-conserved models --- intracellular polarization --- partial differential equations --- sensitivity analysis --- GTPase activating protein (GAP) --- fission yeast Schizosaccharomyces pombe --- CRY2-CIBN --- optogenetics --- clustering --- positive feedback --- network evolution --- Saccharomyces cerevisiae --- polarity --- modularity --- neutrality --- actin waves --- curved proteins --- dynamic instability --- podosomes --- diffusion --- cell polarity --- Cdc42 --- stress --- cellular memory --- phase separation --- prions --- apoptotic extrusion --- oncogenic extrusion --- contractility --- actomyosin --- bottom-up synthetic biology --- motor proteins --- pattern formation --- self-organization --- cell motility --- signal transduction --- actin dynamics --- intracellular waves --- polarization --- direction sensing --- symmetry-breaking --- biphasic responses --- reaction-diffusion --- membrane and cortical tension --- cell fusion --- cortexillin --- cytokinesis --- Dictyostelium --- myosin --- symmetry breaking --- cytoplasmic flow --- phase-space analysis --- nonlinear waves --- actin polymerization --- bifurcation theory --- mass conservation --- spatial localization --- activator–inhibitor models --- developmental transitions --- cell polarization --- mathematical model --- fission yeast --- reaction–diffusion model --- small GTPases --- Cdc42 oscillations --- pseudopod --- Ras activation --- cytoskeleton --- chemotaxis --- neutrophils --- natural variation --- modelling --- activator-substrate mechanism --- mass-conserved models --- intracellular polarization --- partial differential equations --- sensitivity analysis --- GTPase activating protein (GAP) --- fission yeast Schizosaccharomyces pombe --- CRY2-CIBN --- optogenetics --- clustering --- positive feedback --- network evolution --- Saccharomyces cerevisiae --- polarity --- modularity --- neutrality

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The actin cytoskeleton plays a central role in many cellular processes including cell motility, cytokinesis, endocytosis and phagocytosis. The structure and dynamics of the actin cytoskeleton is regulated by a large number of proteins that interact with monomeric and/or filamentous actin. Actin monomer binding proteins provides a comprehensive view on actin monomer-binding proteins and the mechanisms by which they contribute to actin dynamics and various actin-dependent cellular processes. This new title contains chapters that describe the basic mechanisms of actin dynamics as well as the structural principles by which various actin-binding proteins interact with actin.

Actin. --- Carrier proteins. --- Binding proteins --- Transport proteins --- Biological transport --- Protein binding --- Proteins --- Actomyosin --- Cytology. --- Biochemistry. --- Cell Biology. --- Biochemistry, general. --- Biological chemistry --- Chemical composition of organisms --- Organisms --- Physiological chemistry --- Biology --- Chemistry --- Medical sciences --- Cell biology --- Cellular biology --- Cells --- Cytologists --- Composition --- Cell biology.