Table of Contents
Overview
Definition of Developmental Biology
Developmental biology is the scientific study of how organisms grow and develop from fertilization to adulthood, involving processes that transform a single cell into a complex organism with specialized organs and systems.[1.1] It aims to elucidate the mechanisms that shape an organism's structure and function throughout its life cycle, from embryo to adult.[2.1] The field has advanced significantly since the molecular genetics revolution of the late 20th century and continues to evolve with new technological innovations.[3.1] Developmental biology integrates disciplines such as molecular biology, physiology, cell biology, anatomy, cancer research, neurobiology, immunology, ecology, and evolutionary biology, making it crucial for understanding broader biological concepts.[4.1] The discipline focuses on how cells organize and specialize, influenced by both genetic and environmental factors.[5.1]Importance of Developmental Biology
Developmental biology is pivotal in understanding how genetic and environmental factors interact to shape organismal development. This field explores the dynamic interplay between genetic predispositions and environmental influences, emphasizing the roles of both nature and nurture in human development and behavior.[7.1] The Reciprocal Gene-Environment Model illustrates this interaction through a feedback loop where genes and environments mutually influence each other, impacting behavior, personality traits, and mental health over time.[8.1] Furthermore, developmental biology is integral to studying the relationship between development and evolution. Evolutionary developmental biology, or evo-devo, examines how changes in embryonic development can drive evolutionary transformations across generations. This approach synthesizes insights from embryology, genetics, and evolutionary theory to deepen our understanding of biodiversity and species adaptation.[12.1] The historical link between development and evolution, highlighted by Charles Darwin, underscores the significance of embryology in evolutionary studies.[10.1] Additionally, developmental biology sheds light on how environmental factors can influence gene expression through epigenetics. This area of study reveals how external factors such as drugs, chemicals, temperature, and light can affect gene activation, influencing organismal development and function.[14.1] Epigenetics provides a molecular mechanism for environmental impacts on development, allowing for greater plasticity and adaptability in response to changing conditions.[16.1] Understanding these processes is crucial for comprehending how environmental conditions can leave lasting marks on genetic material, potentially affecting health and development across generations.[15.1]In this section:
History
Early Theories and Contributions
Developmental biology, as a scientific discipline, investigates the processes by which organisms grow and develop, including regeneration, asexual reproduction, metamorphosis, and the differentiation of stem cells in adult organisms.[39.1] The field has a rich history, with significant contributions from research in Drosophila genetics, which has uncovered numerous genes crucial to development and underscored the role of genetic pathways.[37.1] Beyond embryonic development in animals, which involves tissue patterning, growth, and morphogenesis, developmental biology also encompasses the study of plant development.[39.1] These foundational studies have laid the groundwork for modern developmental biology, offering insights into the complex interactions that shape an organism's structure and function throughout its life cycle.[38.1]Evolution of Developmental Biology
The evolution of developmental biology has been profoundly shaped by the integration of evolutionary developmental biology, or evo-devo. This field has transformed our understanding of the interplay between development and evolution, marking a significant paradigm shift in biological sciences. Evo-devo emphasizes the relationship between genetic modularity and evolutionary flexibility, highlighting the adaptability of developmental mechanisms and their evolutionary potential. This framework is particularly relevant in conservation efforts, as it elucidates the genetic and developmental bases of phenotypic plasticity and modularity.[40.1] Model organisms, notably Drosophila melanogaster, have been instrumental in advancing developmental biology. For over a century, Drosophila has served as a key model in genetic studies, particularly in understanding the genetic control of development. The advent of reverse genetics has enhanced genome manipulation in Drosophila, establishing it as a premier genetic system. These tools have enabled researchers to maintain complex stocks with multiple mutations, significantly contributing to the study of human disease genes and advancing our understanding of developmental processes across species.[42.1] Insights from Drosophila research have been crucial in unraveling aspects of nervous system development and function, influencing neuroscience research in vertebrate species.[43.1] The fruit fly's well-mapped genome, short life cycle, and ease of genetic manipulation provide unparalleled insights into the molecular and cellular mechanisms underpinning development and disease.[44.1] Drosophila has transformed our understanding of gene-governed body patterning, with its anatomy showing more obvious parallels with human body structure compared to other model organisms like C. elegans.[45.1] In vertebrates, limb development has been a focal point of research in both developmental and evolutionary biology. The transition from fin to limb represents a key morphological innovation, with limb formation beginning in the morphogenetic limb field. Mesenchymal cells from the lateral plate mesoderm proliferate, causing the ectoderm to bulge out and form a limb bud.[51.1] Recent advances in genetics and developmental biology have provided mechanistic explanations for the origin and evolution of paired appendages, shedding light on the evolutionary changes that led to the development of limbs in land vertebrates and tetrapods.[52.1] The evolution of limbs from fish fins involved the retention of some fin elements while new features developed, resulting in the diverse limb structures seen in lizards, birds, and humans.[53.1] Variations in the limb developmental program have contributed to the diversity of structure and form across vertebrates, with basal vertebrates like fish and frogs showing even greater divergence in limb formation mechanisms.[54.1] Recent advances in developmental biology, particularly in stem cell biology and epigenetics, have furthered our understanding of cell differentiation. Signaling in early embryos, especially cell-cell signaling, induces the expression of specific transcription factor networks, facilitating the remodeling of epigenetic marks.[55.1] The fate of embryonic cells often depends on their interactions with surrounding tissues, with differentiation involving a commitment process where cells become specified to certain fates.[56.1] These insights into stem cell differentiation have significant implications for potential therapeutic applications in regenerative medicine, highlighting the intricate pathways that govern development.Recent Advancements
Technological Innovations
Recent advancements in developmental biology have been significantly influenced by technological innovations, particularly in the fields of microscopy and gene editing. The evolution of microscopy, from the invention of the compound microscope in 1595 to the development of the electron microscope, has been pivotal in enhancing our understanding of cellular structures and their functions. These advancements have facilitated the discovery of organelles and their distinct roles, which are essential for comprehending complex biological processes.[84.1] Gene editing technologies, notably CRISPR, have revolutionized developmental biology by enabling precise manipulation of genetic material. CRISPR activation tools have allowed researchers to create reproducible models of embryonic development using pluripotent cells, providing insights into developmental pathways and mechanisms underlying developmental disorders. This has offered new perspectives on cellular differentiation and embryonic development.[89.1] Moreover, the creation of synthetic embryos using stem cells marks a significant breakthrough. These models provide a more accurate representation of early human development, allowing for the study of embryonic processes in a controlled environment. By leveraging pluripotent stem cells and introducing signaling factors that mimic natural developmental stages, scientists have been able to recapitulate early embryonic development, thereby enhancing our understanding of human biology.[86.1]Current Research Trends
Recent advancements in developmental biology have been significantly influenced by the integration of stem cell research, which offers profound insights into human development and cellular processes. This research can lead to new understandings of disease mechanisms and potential therapies, with applications in regenerative medicine, disease modeling, and drug discovery.[93.1] However, ethical considerations, particularly concerning the derivation and use of human embryonic stem cells, remain a contentious issue. These debates are informed by scientific principles, societal values, and the potential benefits and risks associated with this research.[94.1] In addition to stem cell research, ethical considerations are increasingly integral to biotechnological advancements. As biotechnology advances rapidly, they are crucial in areas such as genetic engineering, cloning, and biodiversity conservation. Balancing innovation with ethical responsibility presents ongoing challenges.[92.1] Moreover, the integration of artificial intelligence (AI) and machine learning in developmental biology is a burgeoning area of research. AI-driven bioinformatics enhances biological research through data analysis and algorithm development, enabling the classification of biological sequences and prediction of disease-associated mutations. Deep learning, a subset of AI, has expanded capabilities in bioinformatics by allowing models to learn hierarchical representations of biological data. This integration is crucial for understanding complex patterns of cellular differentiation and embryonic development.[101.1] As AI-driven bioinformatics evolves, there is a growing demand for specialists with expertise in computational biology, machine learning, and data science to manage and derive meaningful insights from biological data.[101.1]In this section:
Key Concepts In Developmental Biology
Stem Cells and Differentiation
Stem cells play a crucial role in developmental biology due to their unique differentiation capabilities. The primary distinction between embryonic stem cells and adult stem cells is their origin; embryonic stem cells are derived from early-stage embryos, while adult stem cells are found in mature tissues such as bone marrow.[117.1] Embryonic stem cells are characterized by their pluripotency, which allows them to differentiate into any type of cell, whereas adult stem cells exhibit limited differentiation potential, being classified as either multipotent or unipotent.[120.1] This limitation in differentiation is significant, as adult stem cells are responsible for replenishing dead or damaged tissues, thereby facilitating organ repair and maintenance.[117.1] Understanding these differences is essential for exploring the potential applications of stem cells in regenerative medicine.[120.1] The differentiation pathways of stem cells are significantly influenced by environmental factors, including the extracellular matrix (ECM). The ECM plays a crucial role in the stem cell niche, modulating maintenance, proliferation, self-renewal, and differentiation of stem cells.[144.1] It provides structural support and biochemical cues that guide stem cell behavior, impacting tissue homeostasis and regeneration.[144.1] The stiffness of the ECM, for instance, is a key factor that stem cells can sense, influencing their differentiation through mechanotransduction pathways such as integrin-based focal adhesions and associated signaling pathways like ERK, JNK, Wnt-β-catenin, and Hippo.[145.1] These pathways translate mechanical signals from the ECM into gene expression changes that determine cell fate.[146.1]Morphogenesis and Patterning
Morphogenesis and patterning are fundamental aspects of developmental biology, focusing on the processes that shape an organism's structure and form. Morphogenesis involves the development of an organism's shape and structure from a single cell to a complex multicellular entity, encompassing processes such as cell division, differentiation, and tissue morphogenesis.[114.1] Patterning refers to the spatial and temporal distribution of cells and tissues, crucial for the correct formation of body structures and organs.[113.1] Induction is pivotal in morphogenesis and patterning, influencing cell fate decisions by allowing one cell or group of cells to affect the developmental fate of another. This process controls differentiation and pattern formation, establishing body axes and ensuring cells develop according to their position within the embryo.[112.1] The interaction between inductive signals and cytoplasmic determinants is critical, as cytoplasmic determinants dictate cell fate based on lineage, while inductive signals provide positional information, highlighting their combined importance in development.[124.1][112.1] Additionally, mechanical forces and biochemical signals interact to influence cell fate and patterning. Mechanical inputs, such as extracellular matrix stiffness, can drive mesenchymal stem cell (MSC) fate, with induction media enhancing this response.[126.1] This interplay underscores the complexity of morphogenesis, where both intrinsic mechanical cues and extrinsic biochemical signals contribute to the regulation of cellular behavior and pattern formation.[126.1]In this section:
Applications Of Developmental Biology
Biotechnology and Regenerative Medicine
Developmental biology has been instrumental in advancing biotechnology and regenerative medicine, particularly through its impact on tissue engineering, stem cell therapy, and gene therapy. Understanding developmental processes has led to innovative techniques crucial for these fields.[161.1] Regenerative medicine aims to restore the function of lost or damaged tissues and organs by employing strategies that integrate cells, scaffolds, and bioactive molecules, thereby overcoming the limitations of the body's natural regenerative abilities.[158.1] The principles of developmental biology and regenerative medicine involve complex events that result in the formation of normal tissues and organs. The extracellular matrix (ECM) plays a vital role in cellular migration and differentiation, essential for tissue engineering.[159.1] Advances in biotechnology have been furthered by combining developmental biology with technologies like CRISPR and 3D bioprinting. CRISPR technology has transformed biology by allowing precise DNA and RNA modifications, though challenges remain in clinical translation.[175.1] Its integration with 3D culture systems has fostered the development of complex pathophysiological models and personalized medicine.[176.1] Three-dimensional bioprinting is a groundbreaking technology in tissue engineering, enabling the creation of functional tissue constructs and organs from 3D digital models. This method offers advantages over traditional tissue engineering by allowing the fabrication of patient-specific spatial geometry, controlled microstructures, and precise cell positioning, essential for tissue engineering scaffolds.[177.1] These advancements highlight the significant impact of developmental biology on biotechnology and regenerative medicine, paving the way for future innovations and therapeutic applications.[178.1]Understanding Human Development and Disease
Developmental biology is essential for understanding human development and disease, providing insights into the genetic and molecular mechanisms underlying these processes. This field is crucial in identifying the causes of congenital anomalies and diseases such as cancer and neurodegenerative disorders. By studying developmental processes, researchers can discover new therapeutic targets, potentially leading to innovative treatments for these conditions.[152.1] The research in developmental biology has significantly advanced strategies for preventing, diagnosing, and treating a variety of conditions, from congenital anomalies to cancer. These insights have been pivotal in regenerative medicine, which aims to restore or replace damaged tissues and organs by understanding developmental mechanisms.[153.1] Moreover, developmental biology has made substantial contributions to cancer genetics. The groundbreaking work of researchers like Eric Wieschaus and Christiane Nusslein-Volhard has transformed the understanding of cell fate mechanisms, which are vital in both developmental biology and cancer genetics.[169.1] This research underscores the strong correlation between congenital anomalies and childhood cancers, highlighting the importance of understanding these processes to enhance prevention and treatment strategies.[170.1] The National Institute of Child Health and Human Development (NICHD) supports extensive research to understand congenital anomalies, their causes, and mechanisms. This research aims to develop new technologies for detecting congenital anomalies and atypical developmental processes, as well as identifying new therapeutics to treat these conditions.[171.1] The Congenital Anomalies Initiative and the Gabriella Miller Kids First Pediatric Research Program exemplify efforts to leverage genomic and biomedical discoveries to further understand the mechanisms responsible for structural congenital anomalies and childhood cancers.[172.1]In this section:
Model Organisms In Developmental Biology
Commonly Used Model Organisms
Model organisms are essential in developmental biology, offering insights into genetic, developmental, and disease processes. Among the most widely used are the nematode Caenorhabditis elegans, the fly Drosophila melanogaster, the zebrafish Danio rerio, and the mouse Mus musculus. These organisms are chosen for their unique characteristics, which facilitate bridging the gap between simple unicellular organisms and more complex animals used in genetic studies.[191.1] The selection of a model organism is guided by the specific biological question under investigation. They are classified based on biological complexity and evolutionary relationships, from simple microbes to complex vertebrates, allowing researchers to choose the most suitable model for studying genetics, development, and disease.[192.1] Zebrafish, for example, have become a valuable alternative to traditional mammalian models in vertebrate developmental biology and toxicology. Native to Southeast Asia, they are characterized by a short generation time and high fecundity, making them efficient for genetic studies.[204.1] The zebrafish genome shares significant similarities with the human genome, and their transparent bodies and low maintenance costs make them a powerful model for studying human genetic diseases and metabolic disorders.[205.1] In contrast, Drosophila melanogaster and Caenorhabditis elegans are used to study molecular, cellular, and developmental processes in animals. Despite their morphological differences and evolutionary distance, these organisms have facilitated significant discoveries in developmental biology that might not have been possible with other models.[211.1]Contributions of Model Organisms to Research
Model organisms have significantly advanced developmental biology by elucidating fundamental biological processes. The nematode Caenorhabditis elegans, with its completely mapped and fixed cell lineage, has been pivotal in understanding cell differentiation and gene expression, allowing precise observation of developmental stages.[193.1] Chosen by Sydney Brenner in the 1960s, C. elegans serves as a bridge between simple unicellular organisms and more complex animals like Drosophila melanogaster and mice, which are used in genetic studies.[199.1] Its rapid reproduction and large progeny make it ideal for developmental research.[207.1] Drosophila melanogaster, or the fruit fly, has also been instrumental in providing insights into human genetics and developmental biology. Studies on gene function through mutations in Drosophila have led to significant discoveries in biomedical research, highlighting the role of model organisms in linking basic research to clinical applications.[201.1] The genetic tools available, such as gene knock-in techniques, have revolutionized biological studies by enabling precise analysis of biological functions and modeling human diseases.[200.1] Model organisms remain indispensable in developmental and cellular research, offering insights into the complex processes that govern life from its earliest stages. They are crucial for deciphering the cellular events leading to tissue and organ formation.[212.1] Despite advancements in in silico and stem-cell-based techniques, model organisms continue to be vital for studying human diseases and developing cures. Research on these experimentally tractable organisms has identified many human disease-relevant genes and pathways, underscoring their ongoing importance in biological research.[213.1]In this section:
Interdisciplinary Connections
Integration with Genetics and Molecular Biology
Developmental biology is closely linked with genetics and molecular biology, as these fields collectively enhance our understanding of the processes governing organismal development. A key aspect of this integration is the study of gene-environment interactions, which significantly influence developmental outcomes. Environmental factors such as drugs, chemicals, temperature, and light can impact gene expression, thereby affecting organismal development and function. For example, the expression of the C gene in Himalayan rabbits, responsible for pigment development, is regulated by temperature, illustrating how environmental conditions can modulate genetic expression.[244.1] The interaction between genetic regulation and environmental factors is also evident in behaviors that are either genetically ingrained or learned through experience. Some behaviors, like a spider spinning a web or a bird building a nest, are embedded in an organism's genetic code, while others are acquired through environmental interactions, enabling adaptation to changing conditions.[245.1] This dynamic relationship highlights the importance of both genetic predispositions and environmental influences in shaping behavior. Epigenetics exemplifies the integration of genetics and molecular biology with developmental biology by showing how environmental factors can modify gene expression without altering the DNA sequence. These epigenetic modifications have significant implications for health, development, and evolution, as they regulate genes beyond the traditional genetic code.[246.1] The gene-environment interplay, often mediated by epigenetic processes, affects individual differences in behavior and health, emphasizing the molecular mechanisms underlying these interactions.[251.1] Furthermore, environmental exposures, such as diet and pollutants, can lead to epigenetic changes that influence gene expression and phenotypic outcomes. These modifications can be transmitted across generations, indicating the long-term impact of environmental factors on genetic regulation.[252.1] Early environmental conditions, including exposure to poverty and stress, have been linked to maladaptive development and compromised health, underscoring the critical role of gene-environment interactions in developmental biology.[253.1]Impact on Evolutionary Biology
Evolutionary developmental biology, or Evo-Devo, is a crucial interdisciplinary field that bridges embryology, ecology, and genetics, significantly enhancing our understanding of evolutionary biology. It offers insights into how genetic configurations influence physical traits across species, providing a comprehensive view of evolutionary processes. The integration of embryology and genetics has been instrumental in establishing Evo-Devo, demonstrating how embryonic processes can shape evolutionary trajectories. Early embryologists, such as A.O. Kowalevsky, highlighted the evolutionary links from invertebrates to vertebrates through comparative studies of embryonic development, a fundamental concept in Evo-Devo.[259.1] Evo-Devo underscores that changes in adult forms require alterations in the embryological processes responsible for those forms, a concept crucial for understanding evolutionary changes. Although this idea was largely overlooked during much of the twentieth century, the field has since gained recognition for elucidating how similar genetic pathways are reused across different species, thereby deepening our understanding of evolutionary connections.[261.1][259.1] In conservation biology, Evo-Devo provides insights into species adaptation to environmental changes. Understanding evolutionary principles is essential for developing effective conservation strategies, as it reveals how species evolve in response to environmental stressors. For example, climate change has historically influenced ecological community compositions, driving evolutionary processes such as species adaptation and extinction.[262.1] By integrating evolutionary principles within conservation practices, biologists can better adapt their strategies to address the real-time evolution of species due to environmental changes.[262.1]References
[1] Developmental Biology - An Overview - Online Tutorials Library — Developmental Biology An Overview - Introduction Developmental biology is the study of how organisms grow and develop from the moment of fertilization to adulthood. It encompasses a wide range of biological processes, from the formation of a single cell to the formation of complex organisms with intricate organs and organ systems.
[2] Developmental Biology - Stanford Encyclopedia of Philosophy — 1. Overview 1.1 Historical Considerations. Developmental biology is the science of explaining how a variety of interacting processes generate an organism's heterogeneous shapes, size, and structural features that arise on the trajectory from embryo to adult, or more generally throughout a life cycle (Love 2008b; Minelli 2011a).
[3] The evolution of developmental biology through conceptual and ... — Summary. Developmental biology—the study of the processes by which cells, tissues, and organisms develop and change over time—has entered a new golden age. After the molecular genetics revolution in the 80s and 90s and the diversification of the field in the early 21st century, we have entered a phase when powerful technologies provide new
[4] Developmental Biology - NCBI Bookshelf - National Center for ... — Developmental biology is one of the fastest growing and most exciting fields in biology, creating a framework that integrates molecular biology, physiology, cell biology, anatomy, cancer research, neurobiology, immunology, ecology, and evolutionary biology. The study of development has become essential for understanding any other area of biology.
[5] Developmental Biology | NIH Intramural Research Program — Developmental biology aims to understand how an organism develops—how a single cell becomes an organized grouping of cells that is then programmed at specific times to become specialized for certain tasks. Genes control much of an organism's development, but environmental stimuli also play a role, resulting in the complex "nature vs
[7] Nature vs Nurture Debate: Genes vs Environment Influence — The Nature vs Nurture debate is a long-standing discussion in psychology, biology, and related fields that explores the relative influences of genetics (nature) and environment (nurture) on human development and behaviour. Examples of nature vs nurture can be found in various aspects of human development and behaviour, illustrating the interplay between genetic and environmental factors. While studies suggest that intelligence has a significant genetic component (nature), environmental factors like education, nutrition, and cognitive stimulation (nurture) also play crucial roles in cognitive development. The nature vs nurture debate has significant implications for parenting, influencing how we understand child development and approach child-rearing. Early Years TV Nature vs Nurture Debate: Genes vs Environment Influence.
[8] Reciprocal Gene-Environment Model: How Genes and Environment Interact ... — Reciprocal Gene-Environment Model: How Genes and Environment Interact - Psychology Fanatic The Reciprocal Gene-Environment Model is a theoretical framework that explains how genetic and environmental factors interact in a bidirectional, reciprocal manner to influence human development and behavior. This model posits that genes and environments influence each other in a dynamic feedback loop, shaping individual behavior, personality traits, and even mental health outcomes over time. The history of the Reciprocal Gene-Environment Model (RGEM) is intertwined with the development of behavioral genetics and the growing recognition of the complex interplay between nature (genes) and nurture (environment) in shaping human traits and behaviors. The Diathesis-Stress Model and the Reciprocal Gene-Environment Model are both psychological theories that attempt to explain the development of psychological disorders by considering the interplay between nature (genes) and nurture (environment).
[10] An Introduction to Evolutionary Developmental Biology — Despite its relatively recent resurgence, the connection between development and evolution is not new. Darwin considered embryonic studies as essential to his theory of evolution, and long before Darwin published Origin, the connection between evolutionary biology and developmental biology (known then as embryology) was recognized.In fact, the term evolution that we now associate with
[12] Evolutionary Developmental Biology (Evo-Devo): Past, Present, and ... — Evolutionary developmental biology (evo-devo) is that part of biology concerned with how changes in embryonic development during single generations relate to the evolutionary changes that occur between generations. Charles Darwin argued for the importance of development (embryology) in understanding evolution. After the discovery in 1900 of Mendel's research on genetics, however, any
[14] Environmental Influences on Gene Expression - Nature — Environmental Influences on Gene Expression | Learn Science at Scitable Similarly, drugs, chemicals, temperature, and light are among the external environmental factors that can determine which genes are turned on and off, thereby influencing the way an organism develops and functions. A second example of how chemical environments affect gene expression is the case of supplemental oxygen administration causing blindness in premature infants (Silverman, 2004). In addition to drugs and chemicals, temperature and light are external environmental factors that may influence gene expression in certain organisms. For example, Himalayan rabbits carry the C gene, which is required for the development of pigments in the fur, skin, and eyes, and whose expression is regulated by temperature (Sturtevant, 1913).
[15] Epigenetics: Environmental Impacts on Gene Expression — Epigenetics represents a fascinating dimension of biology, where gene expression is influenced by factors beyond the DNA sequence itself. This field sheds light on how environmental conditions can leave lasting marks on our genetic material, potentially affecting health and development across generations. Understanding the interplay between environment and epigenetic changes opens new avenues
[16] Role of epigenetics in developmental biology and transgenerational ... — Epigenetics provides a molecular mechanism for environment to influence development, program cellular differentiation, and alter the genetic regulation of development. The current review discusses how epigenetics can cooperate with genetics to regulate development and allow for greater plasticity in response to environmental influences.
[37] Reflections on the past, present and future of developmental biology — The history of Developmental Biology does amply justify this principle, but also strongly justifies the opposite view. Decades of work on Drosophila genetics led to the discovery of probably the vast majority of developmentally (and more broadly) important genes. In fact, the pathways in which these genes act are themselves strongly
[38] Developmental Biology - Stanford Encyclopedia of Philosophy — Developmental biology is the science that investigates how a variety of interacting processes generate an organism's heterogeneous shapes, size, and structural features that arise on the trajectory from embryo to adult, or more generally throughout a life cycle. ... ---, 2019, "Inclusion and exclusion in the history of developmental
[39] Developmental biology - Wikipedia — Developmental biology is the study of the process by which animals and plants grow and develop. Developmental biology also encompasses the biology of regeneration, asexual reproduction, metamorphosis, and the growth and differentiation of stem cells in the adult organism. The main processes involved in the embryonic development of animals are: tissue patterning (via regional specification and patterned cell differentiation); tissue growth; and tissue morphogenesis. Because the inducing factor is produced in one place, diffuses away, and decays, it forms a concentration gradient, high near the source cells and low further away. The remaining cells of the embryo, which do not contain the determinant, are competent to respond to different concentrations by upregulating specific developmental control genes. Plant development[edit] doi:10.1016/j.cell.2007.01.015.
[40] Evo-Devo: Integration of Developmental Biology and Evolution — This adaptability suggests that evolutionary potential is closely linked to developmental mechanisms, as illustrated by the discussions in evo-devo literature that highlight the relationship between genetic modularity and evolutionary flexibility (Adams et al.). Additionally, the merging of evo-devo with conservation efforts underscores the practical implications of understanding these connections, suggesting that an evo-devo framework can inform and enhance conservation strategies by elucidating the genetic and developmental bases of phenotypic plasticity, modularity, and evolutionary potential (Adams et al.). In conclusion, the integration of evolutionary developmental biology (evo-devo) has fundamentally reshaped our understanding of the complexity inherent in both development and evolution. The integration of developmental biology and evolution, often encapsulated in the term evolutionary developmental biology (Evo-Devo), represents a significant paradigm shift in our understanding of biological processes.
[42] Introduction: Drosophila —A Model System for Developmental Biology — Received 2017 Sep 19; Accepted 2017 Sep 20; Collection date 2017 Sep. Keywords: Drosophila, model organisms, development, genetics These tools allow researchers to maintain complex stocks with multiple mutations on single chromosomes over generations, an advance that made flies the premier genetic system . In fact, these approaches, and many others, have been put together into a genetic toolkit to test human disease genes in Drosophila . In this issue, the authors will explore recent developments in fly research and compare them to the recent advances in other model organisms. [DOI] [PMC free article] [PubMed] [Google Scholar] [DOI] [PMC free article] [PubMed] [Google Scholar] [DOI] [PMC free article] [PubMed] [Google Scholar] [DOI] [PMC free article] [PubMed] [Google Scholar]
[43] 100 years of Drosophila research and its impact on vertebrate ... — The continuous development of research tools between 1960-2010 has driven numerous new discoveries in fruit flies. This article highlights the many aspects of nervous system development and function that have been unraveled in fruit flies and how these studies have influenced neuroscience research in vertebrate species. Box 1.
[44] Drosophila Models of Human Development and Disease — Drosophila melanogaster, commonly known as the fruit fly, has long been a cornerstone in genetic research and developmental biology. With its well-mapped genome, short life cycle, and ease of genetic manipulation, Drosophila offers unparalleled insights into the molecular and cellular mechanisms underpinning development and disease.
[45] Drosophila and the Molecular Genetics of Pattern Formation: Genesis of ... — It is the fly Drosophila melanogaster (Figure 21-23), more than any other organism, that has transformed our understanding of how genes govern the patterning of the body.The anatomy of Drosophila is more complex than that of C. elegans, with more than 100 times as many cells, and it shows more obvious parallels with our own body structure.Surprisingly, the fly has fewer genes than the worm
[51] Limb development - Wikipedia — Limb development in vertebrates is an area of active research in both developmental and evolutionary biology, with much of the latter work focused on the transition from fin to limb. Limb formation begins in the morphogenetic limb field, as mesenchymal cells from the lateral plate mesoderm proliferate to the point that they cause the ectoderm above to bulge out, forming a limb bud
[52] Evolution of Vertebrate Limb Development - Wiley Online Library — These discoveries in the areas of genetics and developmental biology have shed light on the mechanisms underlying the evolution of this key morphological innovation in vertebrates. In this article, recent advances in these fields and how they can provide a mechanistic explanation for the origin and evolution of paired appendages have been
[53] Fins into limbs evolution, development, and transformation ... — Long ago, fish fins evolved into the limbs of land vertebrates and tetrapods. During this transition, some elements of the fin were carried over while new features developed. Lizard limbs, bird wings, and human arms and legs are therefore all evolutionary modifications of the original tetrapod limb. A comprehensive look at the current state of research on fin and limb evolution and development
[54] Limb positioning and initiation: an evolutionary context of pattern and ... — Nonetheless, variations in the limb developmental program have been elucidated, contributing to the diversity of structure and form seen across these animals. 1 Appendage formation in more basal vertebrates, such as fish and frogs, show even greater divergence in the mechanisms of limb formation.
[55] Cellular Differentiation - an overview | ScienceDirect Topics — Recent advances in developmental biology, stem cell biology and epigenetics have revealed some of the principles by which cell differentiation arises. It is thought that signalling in early embryos, in particular cell-cell signalling, induces expression of specific transcription factor networks, allowing the remodelling of epigenetic marks
[56] The Developmental Mechanics of Cell Specification — On a smaller scale, the environment of an embryonic cell consists of the surrounding tissues within the embryo, and the fate of that cell (for instance, whether it becomes part of the skin or part of the lens) often depends upon its interactions with other components of its immediate “ecosystem.” Thus, a second research program of experimental embryology studies how interactions between embryonic cells generate the embryo. The development of specialized cell types is called differentiation (Table 3.2). These overt changes in cellular biochemistry and function are preceded by a process involving the commitment of the cell to a certain fate. The first stage is a labile phase called specification. The fate of a cell or a tissue is said to be specified when it is capable of differentiating autonomously when placed in a neutral environment such as a petri dish or test tube.
[84] History of Cell Biology: Timeline of Important Discoveries - Bitesize Bio — The history of cell biology and the formation of cell theory involved several key developments and discoveries, including the invention of the compound microscope in 1595, the visualization of cells in cork by Robert Hooke in 1655, and the visualization of live cells under the microscope by Anton van Leeuwenhoek in 1674. In the history of cell biology, there have been many individual scientific discoveries and technological developments, from the invention of the microscope, allowing us to see individual cells, to the discovery of fluorescent proteins and the invention of powerful electron microscopes, allowing us to study the function and structure of cells in greater detail. Further Reading on the History of Cell Biology
[86] A new era of stem cell and developmental biology: from blastoids to ... — In a significant breakthrough, scientists have generated synthetic embryos using stem cells, providing a more accurate model of early human development. In addition to organoids, recent advances in stem cell research have even facilitated the development of early embryonic models that mimic human embryos. Taking the potency of pluripotent stem cells to advantage, the addition of various signaling factors parallel to those that work at the corresponding developmental stage to EBs coaxed the formation of models that recapitulate the early development of the embryo. In vitro attachment and symmetry breaking of a human embryo model assembled from primed embryonic stem cells. Pluripotent stem cell-derived model of the post-implantation human embryo.
[89] Self-organization of mouse embryonic stem cells into ... - Cell Press — Lodewijk et al. develop a CRISPRa-programmed embryo model using mouse pluripotent cells. By introducing controllable CRISPR activation tools into pluripotent cells, they enabled the efficient generation of a reproducible model. These tools were also used to disrupt developmental pathways, offering a method to study mechanisms of developmental disorders.
[92] Biotechnology Ethical Issues - Biology Simple — The Role Of Ethics In Biotechnological Advancements. As biotechnology continues to advance at a breakneck speed, the role of ethics becomes increasingly integral. Decisions in the realm of genetic engineering, cloning, stem cell research, and biodiversity conservation are just a few areas where ethical considerations play a crucial role
[93] Stem Cell Research Controversy: A Deep Dive (2024) — Scientific advancement: Stem cell research can contribute to a better understanding of human development and cellular processes, which can lead to new insights into disease mechanisms and potential therapies. Each of these stem cell types has its own advantages and limitations, and researchers continue to explore their potential applications in various fields, including regenerative medicine, disease modeling, and drug discovery. The Science and Potential of Stem Cell Research Balancing the potential benefits of stem cell research with the ethical concerns regarding the status of the embryo remains a challenging and unresolved issue. Ethical debates should be informed by scientific principles, societal values, and the potential benefits and risks associated with stem cell research.
[94] The bioethics of stem cell research and therapy - PMC — The main bioethical issues associated with human stem cells involve their derivation and use for research. Although there are interesting ethical issues surrounding the collection and use of somatic (adult) stem cells from aborted fetuses and umbilical cord blood, the most intense controversy to date has focused on the source of human embryonic stem (hES) cells.
[101] Bioinformatics AI: Driving Future Biological Breakthroughs — Explore how AI-driven bioinformatics enhances biological research through data analysis, algorithm development, and interdisciplinary expertise. Supervised learning, a widely used ML technique in bioinformatics, relies on labeled datasets to train models that classify biological sequences or predict disease-associated mutations. Deep learning has expanded AI’s capabilities in bioinformatics, enabling models to learn hierarchical representations of biological data. Managing biological data effectively is essential for deriving meaningful insights from AI-driven bioinformatics research. Extracting insights from genomic and proteomic data requires computational approaches capable of navigating biological sequence complexity. Awareness of biological variability and evolutionary principles helps refine AI models to account for species-specific differences in genomic and proteomic data. As AI-driven bioinformatics evolves, demand for specialists with expertise in computational biology, machine learning, and data science continues to grow.
[112] Key-Notes: basic concepts in Developmental Biology - Università di Torino — Induction is a process whereby one cell or group of cells can influence the developmental fate of another, and is a common strategy to control differentiation and pattern formation in development. As we have seen from the previous paragraph cytoplasmic determinants and inductive signals can both be used to control cell fate during development. If development was exclusively controlled by cytoplasmic determinants, the fate of every cell would depend uniquely on its lineage, while its position in the embryo would be irrelevant. On the other hand, if development was controlled exclusively by inductive signals, the fate of every cell would depend mostly on its position in the embryo.
[113] Developmental biology - Wikipedia — Developmental biology is the study of the process by which animals and plants grow and develop. Developmental biology also encompasses the biology of regeneration, asexual reproduction, metamorphosis, and the growth and differentiation of stem cells in the adult organism. The main processes involved in the embryonic development of animals are: tissue patterning (via regional specification and patterned cell differentiation); tissue growth; and tissue morphogenesis. Because the inducing factor is produced in one place, diffuses away, and decays, it forms a concentration gradient, high near the source cells and low further away. The remaining cells of the embryo, which do not contain the determinant, are competent to respond to different concentrations by upregulating specific developmental control genes. Plant development[edit] doi:10.1016/j.cell.2007.01.015.
[114] Developmental Biology Notes - Importance and Techniques - GeeksforGeeks — *Development Biology* is a branch of biology that studies the process by which an organism grows and develops from a single cell to a complex multicellular structure. This field studies various biological processes, including cell division, cell differentiation, tissue morphogenesis, organ formation, embryogenesis, inheritance, cell signaling pathway, apoptosis, and the overall development of organisms. The scope of developmental biology encompasses the study of embryonic development, cell differentiation, morphogenesis, organogenesis, growth, and regeneration in various organisms across different stages of life. Developmental Biology Development Biology is a branch of biology that studies the process by which an organism grows and develops from a single cell to a complex multicellular structure. This field studies various biological processes, including cell division, cell differentiation, tissue morphogenesis, organ formation, 9 min read
[117] Which statement correctly explains the difference between adult stem ... — The key difference between adult stem cells and embryonic stem cells lies in their capabilities and sources. Adult stem cells are typically found in various tissues such as bone marrow and are responsible for replenishing dead or damaged tissues, allowing for organ repair and maintenance. ... Differentiation Potential: Embryonic stem cells are
[120] Embryonic Versus Adult Stem Cells - ScienceDirect — The ability of adult stem cells to differentiate is limited; these cells can be either multipotent or unipotent. ... and potency (the production of one or many differentiated lineages). This chapter will discuss the differences between embryonic and adult stem cells in terms of their ability to self-renew, proliferate, and differentiate, and it
[124] Animal Development I: Fertilization & Cleavage — Because mammalian embryos have no cytoplasmic determinants and have very small amounts of evenly-distributed yolk, induction is the primary process responsible for establishing the body axes in mammalian embryos. The process of induction is important throughout development, and we will revisit it in the next reading on early animal development.
[126] Mechanically guided cell fate determination in early development — Advancements in biophysical approaches have demonstrated that mechanical forces are not restricted to cell motility and behavior but also to fate determination .Moreover, if MSCs are cultured in neurogenic stiffness (0.1-1 kPa) and after three weeks are incubated with myogenic or osteogenic media, inductive signals are overridden, and neurogenic fate is maintained by MSC .These studies suggest that intrinsic mechanical input (ECM stiffness) is sufficient to drive MSC fate; nevertheless, induction media can enhance this response.Furthermore, these studies strengthen the notion of mechanical input interplay with biochemical signals to prompt cellular fate .Reducing traction forces led to decreased transforming growth factor-β (TGFβ) signaling required for endoderm fate determination.This change in physical force, ultimately regulating a signaling cascade, is biomechanically sensed by integrins such as α5β1 and α3β1 .Certainly, further evidence showed that, for example, fibroblast growth factor (FGF), WNT, and Notch are mechanosensitive pathways to several physical cues, such as stiffness, sheer flow, and tension, among others .
[144] Extracellular matrix: A dynamic microenvironment for stem cell niche — ECM represents an essential player in stem cell niche, since it can directly or indirectly modulate the maintenance, proliferation, self-renewal and differentiation of stem cells.Several ECM molecules play regulatory functions for different types of stem cells, and based on its molecular composition the ECM can be deposited and finely tuned for providing the most appropriate niche for stem cells in the various tissues.ECM is a key component of stem cell niches and is involved in various aspects of stem cell behavior, thus having a major impact on tissue homeostasis and regeneration under physiological and pathological conditions.Experiments performed with decellularized tissues, in which the ECM is preserved, represent a further and direct demonstration of the primary role of ECM in the regulation of stem cell properties.These studies demonstrated that natural ECM scaffolds, derived from decellularized tissues, guide stem cell differentiation into the cell types residing in the tissue from which the ECM was derived.As a constitutive part of the niche, ECM components are key players of the niche instructive power.The instructive cue of ECM on stem cells is a result of a number of different characteristics of the extracellular environment, starting from its biophysical and biomechanical properties up to its biochemical activity.
[145] Stem Cell Differentiation is Regulated by Extracellular Matrix ... — Stem cells mechanosense the stiffness of their microenvironment, which impacts differentiation.Although tissue hydration anti-correlates with stiffness, extracellular matrix (ECM) stiffness is clearly transduced into gene expression via adhesion and cytoskeleton proteins that tune fates.Among the mechanosensitive signaling pathways that transmit ECM stiffness signals to transcriptional machinery are the integrin-based focal adhesions with focal adhesion kinase (FAK) that initiates multiple mechanosensitive pathways.These include ERK, JNK, Wnt-β-catenin, and Hippo pathways. These linkages have been shown to influence the differentiation of adult stem cells (84).Human MSCs were the first stem cells used to demonstrate the in vitro influence of matrix stiffness on stem cell differentiation (23). Various types of stem and progenitor cells have a demonstrated ability to sense the stiffness of ECM.
[146] Stem Cell Differentiation is Regulated by Extracellular Matrix ... — Most reductionist studies with stem-cell cultures nonetheless use rigid and hydrophobic tissue culture plastic, even though cultures of committed cells on soft hydrogels has been known since Pelham and Wang (71) to dramatically limit cell spreading and adhesive signaling relative to stiff substrates. Although stiffness-dependent adhesion and spreading occur within short time scales of 1–2 h (71), more profound and lasting changes in phenotype, such as lineage specification of stem cells, requires specific transcriptional programs to be activated and/or repressed in a process of mechanotransduction from the ECM to the nucleus. Indeed, given the higher water content in soft tissues and the lower water content in stiff tissues (FIGURE 1B), the pleiotropic effects of osmotic pressure changes and hydration motivate further stem-cell differentiation experiments that combine osmotic-hydration changes with drugs that target specific molecules of the cytoskeleton. doi: 10.1016/j.cell.2006.06.044.
[152] What is developmental biology? - California Learning Resource Network — Importance of Developmental Biology. Understanding Human Development and Disease: Developmental biology has significant implications for human health and disease.Mutations in developmental genes can lead to birth defects and diseases such as cancer and neurodegenerative disorders.By understanding the developmental processes, researchers can identify new targets for therapeutic intervention and
[153] Developmental Biology: Scope, Importance, and Applications — Research in developmental biology informs strategies for preventing, diagnosing, and treating conditions ranging from congenital anomalies to cancer. Regenerative Medicine: Developmental biology contributes to the field of regenerative medicine, which aims to restore or replace damaged tissues and organs. By studying the mechanisms of
[158] Lessons from developmental biology for regenerative medicine — The ultimate goal of regenerative medicine is the functional restoration of lost or damaged tissues and organs. Since most tissues in man lack true regenerative properties and instead respond to injury with an inflammatory response and scar tissue formation, regenerative medicine strategies that include combinations of cells, scaffolds, and bioactive molecules to replace injured or missing
[159] Regenerative medicine and developmental biology: the role of the ... — The principles and ultimate goals of regenerative medicine and developmental biology involve a complex sequence of events, culminating in the formation of structurally and functionally normal tissues and organs.The molecular composition of the extracellular matrix (ECM) plays a critical role in cellular migration and differentiation events.This article reviews composition of mammalian ECM, its poorly understood role in developmental biology, and the clinical applications that have resulted from the use of this naturally occurring scaffold.Lessons from developmental biology for regenerative medicine.Biologic scaffolds for regenerative medicine: mechanisms of in vivo remodeling.Inhibition of COX1/2 alters the host response and reduces ECM scaffold mediated constructive tissue remodeling in a rodent model of skeletal muscle injury.
[161] What is developmental biology? - California Learning Resource Network — Advances in Biotechnology and Regenerative Medicine: Developmental biology has paved the way for significant advances in biotechnology and regenerative medicine. Understanding the processes of development has led to the development of new techniques for tissue engineering, stem cell therapy, and gene therapy.
[169] Childhood Cancer and Developmental Biology: A Crucial Partnership — Developmental Biology and Cancer Genetics. At a time when molecular cloning was in its infancy and high throughput genomic sequence analysis was decades away, the research of Eric Wieschaus and Christiane Nusslein-Volhard revolutionized the fields of developmental biology and cancer genetics and ultimately earned a Nobel prize 1.Their initial goal was to study the mechanisms of cell fate
[170] An evaluation of genetic predisposition to congenital anomalies and ... — In the United States, more than 15,000 children per year are diagnosed with cancer, 1 making it the leading cause of death by disease in those 1 to 19 years of age. 2 Notably, one of the strongest risk factors for cancer in children is being born with congenital anomalies. This is true both for chromosomal anomalies (eg, Down syndrome) and nonchromosomal birth defects (eg, nonsyndromic
[171] NICHD Congenital Anomalies Research Information — Through its many components, NICHD conducts and supports research to understand congenital anomalies; their causes and mechanisms; their prevention, detection, and treatments; and the long-term health outcomes of individuals and families affected by them.Through basic research, NICHD-funded scientists have identified many factors that regulate genetic networks triggering and controlling developmental processes and contributing to congenital anomalies.Epigenetic regulatory mechanisms influence developmental processes, including those that underlie some congenital anomalies, such as Prader-Willi syndrome.NICHD-funded researchers strive to develop new technologies to detect congenital anomalies and atypical developmental processes.At the same time, efforts to identify new therapeutics to treat the symptoms and underlying causes of congenital anomalies, including pharmacological, educational, and psychological interventions, and to understand the efficacy of existing therapeutics are also ongoing.Basic and clinical research on the causes and prevention of congenital defects is a major focus of research funded by the Developmental Biology and Congenital Anomalies Branch (DBCAB).In collaboration with the National Cancer Institute and other NIH institutes, the program is building a large data bank to enable researchers to better study children with structural congenital anomalies, childhood cancers, or both.
[172] Developmental Biology and Congenital Anomalies Branch (DBCAB) — Understanding the etiology of these errors in embryonic development provides the most promising route for improving prevention, diagnosis, and implementation of evidence-based treatments for patients and families affected by these rare diseases and conditions.Developmental Genetics and Genomics: Identifies and characterizes the genes, genetic networks, and epigenetic factors that control developmental processes to understand how alterations in them lead to structural congenital anomaliesCongenital Anomalies Initiative: Aims to capitalize on genomic and other biomedical discoveries to further understand the mechanisms responsible for structural congenital anomalies and increase collaborations between basic, translational, and clinical researchersGabriella Miller Kids First Pediatric Research Program (Kids First): NIH-wide program supported through the NIH Common Fund and administered by DBCAB that fosters collaborative research to uncover the causes of childhood cancers and congenital anomalies and support data sharing with the pediatric research communityKids First Data Resource Portal: An interoperable data resource that enables cloud-based access, discovery, and analysis of whole genome sequences to accelerate collaborative pediatric research leading to improved prevention, diagnosis, and treatments for patients and their families with congenital anomalies or childhood cancers; the branch also funds community resources, animal model systems, research tool development, and training to facilitate the efforts of developmental biology researchersMain Research Areas: Congenital anomalies; stem cell biology; lineage differentiation; developmental biologyMain Research Areas: Organogenesis; structural congenital anomalies, excluding neural tube defects
[175] Engineering a New Generation of Gene Editors: Integrating Synthetic ... — CRISPR-Cas technology has revolutionized biology by enabling precise DNA and RNA edits with ease. However, significant challenges remain for translating this technology into clinical applications. Traditional protein engineering methods, such as rational design, mutagenesis screens, and directed evolution, have been used to address issues like low efficacy, specificity, and high immunogenicity
[176] Full article: CRISPR in 3D: Innovations in Disease Modelling and ... — Abstract. The CRISPR-Cas system of genetic engineering has had a significant impact on science and society since its advent in 2013. CRISPR integration with 3D culture systems such as organ-on-a-chips, as well as fast emerging commercial technologies, has encouraged translation of more complex pathophysiological modelling and personalized medicine.
[177] 3D bioprinting of tissues and organs for regenerative medicine — 3D bioprinting is a process of fabricating cell-laden bioinks into functional tissue constructs and organs from 3D digital models . 3D bioprinting possesses several advantages over the classical tissue engineering methods .The inability of classical tissue engineering methods to fabricate complex biomimetic structures results in an over-simplified tissue construct, thus rendering the
[178] 3D Printing in Regenerative Medicine: Technologies and Resources ... — Three-dimensional bioprinting is vital in tissue engineering, which aims to create functional tissues for use in regenerative medicine and drug testing. Bioprinting can provide patient-specific spatial geometry, controlled microstructures, and the positioning of diverse cell types for the fabrication of tissue engineering scaffolds.
[191] Developmental genetics with model organisms - PMC - PubMed Central (PMC) — Genetic animal model organisms with large research communities are the nematode Caenorhabditis elegans, the fly Drosophila melanogaster, the zebrafish Danio rerio, and the mouse Mus musculus. elegans was deliberately chosen by Sidney Brenner in the 1960s as a novel model organism to bridge the gap between the relatively simple unicellular organisms, like bacteria and phages, which were the main focus of molecular biology at the time, and more complex animals that were used in genetic studies, like Drosophila or mouse. 16.Jürgens G., Wieschaus E., Nüsslein-Volhard C., Kluding H., Mutations affecting the pattern of the larval cuticle in Drosophila melanogaster: II. 44.Kimble J., Nüsslein-Volhard C., The great small organisms of developmental genetics: Caenorhabditis elegans and Drosophila melanogaster. C., Hammerschmidt M., Haffter P., Nüsslein-Volhard C., Large-scale mutagenesis in the zebrafish: In search of genes controlling development in a vertebrate.
[192] Model Organism Definition: Key Traits and Research Significance — Model organisms are classified based on their biological complexity and evolutionary relationships, ranging from simple microbes to complex vertebrates. The choice of a model organism depends on the specific biological question being investigated, as different species provide insights into various aspects of genetics, development, and disease.
[193] Model Organisms in Molecular Biology Research - (ONLY ZOOLOGY) — The nematode Caenorhabditis elegans is a key model organism in developmental biology, helping us understand important processes like cell differentiation and gene expression. Its completely mapped and fixed cell lineage allows scientists to watch developmental stages very accurately, showing how genes and environment affect growth and shape.
[199] Developmental genetics with model organisms - PMC - PubMed Central (PMC) — Genetic animal model organisms with large research communities are the nematode Caenorhabditis elegans, the fly Drosophila melanogaster, the zebrafish Danio rerio, and the mouse Mus musculus. elegans was deliberately chosen by Sidney Brenner in the 1960s as a novel model organism to bridge the gap between the relatively simple unicellular organisms, like bacteria and phages, which were the main focus of molecular biology at the time, and more complex animals that were used in genetic studies, like Drosophila or mouse. 16.Jürgens G., Wieschaus E., Nüsslein-Volhard C., Kluding H., Mutations affecting the pattern of the larval cuticle in Drosophila melanogaster: II. 44.Kimble J., Nüsslein-Volhard C., The great small organisms of developmental genetics: Caenorhabditis elegans and Drosophila melanogaster. C., Hammerschmidt M., Haffter P., Nüsslein-Volhard C., Large-scale mutagenesis in the zebrafish: In search of genes controlling development in a vertebrate.
[200] Model Organism Definition: Key Traits and Research Significance — Discover how model organisms contribute to scientific research, their defining traits, and the genetic tools that make them essential for biological studies. Model organisms share attributes that make them particularly useful for research, allowing for reproducible and meaningful insights into biological processes. Advancements in genetic tools have transformed the study of model organisms, allowing researchers to dissect biological functions with precision. Gene knock-in techniques enable the introduction of specific genetic modifications to study the effects of mutations or model human diseases. The choice of a model organism depends on the specific biological question being investigated, as different species provide insights into various aspects of genetics, development, and disease. Invertebrate model organisms, including nematodes and arthropods, provide valuable insights into developmental biology, neurobiology, and genetics.
[201] Model Organisms in Molecular Biology Research - (ONLY ZOOLOGY) — Drosophila melanogaster, known as the fruit fly, is very important in genetic research and is recognized as a key model organism in molecular biology. For example, studying gene function through mutations in these organisms has provided valuable insights into human genetics and developmental biology, leading to discoveries important for biomedical research. In studying genetics and gene function, model organisms are very important tools that greatly improve our understanding of complex biological processes in various situations and conditions. This growing knowledge emphasizes the key role of model organisms, which help connect basic research to clinical applications, in unraveling the genetic complexities crucial to molecular biology studies and possible therapy developments.
[204] Zebrafish as a Model for Developmental Biology and Toxicology — Historically, vertebrate developmental biology and toxicology has been studied using low-throughput mammalian models, but the zebrafish (Danio rerio) has emerged as a viable alternative to these conventional models.Zebrafish are a tropical freshwater fish native to Southeast Asia with a short generation time (3-4 months) and small size (3-4 cm). 1 This teleost has high fecundity; females
[205] Zebrafish as an animal model for biomedical research — With the impactful developments of CRISPR and next-generation sequencing technology, disease modeling in zebrafish is accelerating the understanding of the molecular mechanisms of human genetic diseases. In addition, the use of zebrafish as in vivo models for studying gene functions involved in metabolic activities has recently increased. In particular, with the aid of CRISPR-based-knockout technology and big data from next-generation DNA sequencing, functional validation of GWAS candidates in zebrafish is greatly enhancing the ability and accuracy of identifying causative genes and molecular mechanisms underlying the pathogenesis of human genetic diseases. D. Animal models of human disease: zebrafish swim into view. M. Zebrafish as a model to explore cell metabolism. With their see-through bodies, low maintenance costs and genetic similarity to humans, zebrafish provide a powerful animal model for studying mental disorders and metabolic diseases in the laboratory.
[207] Caenorhabditis elegans as a model in developmental toxicology — 1. Introduction. Caenorhabditis elegans is a free living soil nematode that has been used extensively as a model organism for developmental biology (Figure 1) (). C. elegans reproduce quickly and in large numbers. At 20° C, development proceeds from embryo through four distinct larval stages (L1-L4) to gravid adult hermaphrodites in approximately 72 h ().
[211] Comparison of D. melanogaster and C. elegans developmental stages ... — Drosophila melanogaster and Caenorhabditis elegans are model systems for studying molecular, cellular, and developmental processes in animals (Wolpert 2011).As morphologically different and evolutionarily distant organisms separated by as much as 600 million years in evolution (Adoutte et al. 2000; Weigmann et al. 2003), D. melanogaster and C. elegans have striking differences in cell
[212] Model Organisms: A Closer Look into Current Biological Insights — Roles In Developmental And Cellular Research. Model organisms are indispensable in developmental and cellular research, offering insights into the fundamental processes that govern life from its earliest stages. Studying these organisms helps decipher the complex choreography of cellular events leading to the formation of tissues and organs.
[213] The paradox of model organisms. The use of model organisms in research ... — The main contention, therefore, lies over the continuing role of model organisms in studying human diseases and developing cures against them (Festing & Wilkinson, 2007; Rollin, 2007), especially with the growing maturity of in silico and stem-cell-based techniques. “A large number of human disease-relevant genes and pathways have only been identified in the past two decades through intense research on experimentally tractable model organisms,” noted Erich Brunner, a scientist at the Proteomics and Technology Development Center for Model Organism Proteomes at the Institute of Molecular Biology at the University of Zurich in Switzerland. The paradox of model organisms seems to be that the need for them will only diminish once most of the fundamental mechanisms of biology have been solved to allow the greater use of both human tissue cultures and in silico methods for drug discovery.
[244] Environmental Influences on Gene Expression - Nature — Environmental Influences on Gene Expression | Learn Science at Scitable Similarly, drugs, chemicals, temperature, and light are among the external environmental factors that can determine which genes are turned on and off, thereby influencing the way an organism develops and functions. A second example of how chemical environments affect gene expression is the case of supplemental oxygen administration causing blindness in premature infants (Silverman, 2004). In addition to drugs and chemicals, temperature and light are external environmental factors that may influence gene expression in certain organisms. For example, Himalayan rabbits carry the C gene, which is required for the development of pigments in the fur, skin, and eyes, and whose expression is regulated by temperature (Sturtevant, 1913).
[245] What are behavioral adaptations? - The Environmental Literacy Council — Examples include a spider spinning a web, a bird building a nest, or a newborn mammal suckling. These behaviors are deeply ingrained in the organism's genetic code. Learned behaviors, on the other hand, are acquired through experience. They allow organisms to adapt to changing environments and to fine-tune their responses to specific situations.
[246] Epigenetic Mechanisms in Gene Regulation and Inheritance — Epigenetics is reshaping our understanding of gene expression and inheritance, offering insights into how environmental factors can influence genetic traits without altering the DNA sequence itself. This field holds significant implications for health, development, and evolution, as it reveals mechanisms that regulate genes beyond the
[251] Genes and environments, development and time - PNAS — A now substantial body of science implicates a dynamic interplay between genetic and environmental variation in the development of individual differences in behavior and health. Such outcomes are affected by molecular, often epigenetic, processes involving gene-environment (G-E) interplay that can influence gene expression.
[252] Environmental exposures influence multigenerational epigenetic ... — Epigenetics are also modified by a multitude of environmental exposures, including diet and pollutants, allowing an individual's environment to influence gene expression and resultant phenotypes and clinical outcomes. These epigenetic modifications due to gene-environment interactions can also be transmitted across generations, raising the
[253] Genes and environments, development and time - PubMed — Such outcomes are affected by molecular, often epigenetic, processes involving gene-environment (G-E) interplay that can influence gene expression. Early environments with exposures to poverty, chronic adversities, and acutely stressful events have been linked to maladaptive development and compromised health and behavior.
[259] Embryology and Evolutionary Relationships - (ONLY ZOOLOGY) — Additionally, combining embryology with fields such as ecology and genetics has greatly helped develop evolutionary developmental biology (Evo-Devo), providing a broader view of how genetic setups affect physical traits in different species (Gilbert et al.). The merging of embryology and genetics has created the area of evolutionary developmental biology (Evo-Devo), showing how embryonic processes affect evolution paths. Notably, early embryologists like A.O. Kowalevsky conducted important comparative studies of embryonic development across different species, highlighting the continuous evolutionary links from invertebrates to vertebrates, which is a key idea in Evo-Devo (Gilbert et al.). Understanding these processes shows that similar genetic pathways are often reused in different species, which deepens our understanding of evolutionary connections and reinforces key ideas of Evo-Devo ((Mallarino R et al.)).
[261] PDF — evolutionary developmental biology: that in order to achieve a modification in the adult form, evolution must modify the embryological processes responsible for that form, so that an understanding of evolution requires an understanding of development. But this principle was rejected during most of the twentieth century. This was the time
[262] Role of Evolution in Conservation Biology - (ONLY ZOOLOGY) — Understanding evolutionary principles is indispensable in conservation biology, as it elucidates how species adapt to changing environments and the role of biodiversity in ecosystem stability. Additionally, new theoretical frameworks are needed to integrate evolutionary principles within conservation practices, enabling biologists to adapt their strategies as species evolve in real-time due to environmental stressors (Arnold et al.). For instance, climate change affected ecological community make-up during the Quaternary which was probably both the cause of, and was caused by, evolutionary processes such as species evolution, adaptation and extinction of species and populations(Stewart et al.). Understanding evolutionary processes, such as adaptation and species divergence, is crucial for devising effective conservation practices that can mitigate the impacts of climate change and habitat alteration.