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Vertebrate forms are tremendously diverse. While there are many studies identifying genetic loci that have played a role in diversification, there are fewer that elucidate specific evolutionary changes and mechanisms at the cellular level which drive differences in adult morphology. Pigmentation is an especially tractable trait to study mechanisms of diversification in form. Fishes of the genus Danio exhibit diverse pigment patterns that serve as useful models for understanding the genes and cell behaviors underlying evolution of adult form. Among these species, zebrafish D. rerio exhibit several dark stripes of melanophores with sparse iridophores that alternate with light interstripes of dense iridophores and xanthophores. By contrast, the closely related species D. nigrofasciatus has an attenuated pattern with fewer melanophores, stripes and interstripes. Here we demonstrate species differences in iridophore development that set-up the fully formed patterns. Using genetic and transgenic approaches we identify the secreted peptide Endothelin-3 (Edn3)--a known melanogenic factor of tetrapods--as contributing to reduced iridophore proliferation and fewer stripes and interstripes in D. nigrofasciatus. We further show the locus encoding this factor is expressed at lower levels in D. nigrofasciatus owing to cis-regulatory differences between species, and that functions of two paralogous loci encoding Edn3 have been partitioned between skin and non-skin iridophores. In contrast, Edn3 is required by all three pigment cell types in the developmental model the Mexican axolotl (Ambystoma mexicanum), suggesting a model for evolutionary changes in Edn3 requirements in pigment pattern diversification across vertebrates. We show that the locus responsible for the historic axolotl pigment phenotype, "white" (d/d), is edn3. Transgenic restoration of Edn3 expression in the white axolotl rescues the pigmentation phenotype, while knockdown of Edn3 in wild-type axolotls via morpholino injections phenocopies white.
This book comprehensively summarizes the biological mechanisms of coloration and pattern formation of animals at molecular and cellular level, offering up-to-date knowledge derived from remarkable progress in the last 10 years. The brilliant coloration, conspicuous patterns and spectacular color changes displayed by some vertebrates and invertebrates are generally their strategies of the utmost importance for survival. Consists of mainly three parts, starts with introductory chapter, such as Pigments and Pigment Organelles, Developmental Genetics of Pigment Cell Formation, Adult Pigment Patterns, and Color Changes, this book introduces new pigment compounds in addition to classically known pigments and organelles, explains how the generation of multiple types of pigment cell is genetically controlled, describes the mechanisms underlying the zebrafish stripe formation as well as other animals and also summarizes the mechanism of physiological and morphological color changes of teleost, amphibian and cephalopod. Written by experts in the field, this book will be essential reading for graduate students and researchers in biological fields who are interested in pigmentation mechanisms of animals.
Authored by leading experts in the field, this book provides the first comprehensive overview of the mechanisms of early patterning and morphogenesis in zebrafish. It summarizes the current knowledge and the key questions for the next decade of research.
A discussion of the neural crest and neural crest cells, dealing with their discovery, their embryological and evolutionary origins, their cellular derivatives - in both agnathan and jawed vertebrates or gnathostomes - and the broad topics of migration and differentiation in normal development. The book also considers what goes wrong when development is misdirected by mutations, or by exposure of embryos to exogenous agents such as drugs, alcohol, or excess vitamin A, and includes discussions of tumours and syndromes and birth defects involving neural crest cells.
Highlighting the growing importance of the sticklebacks as a model species in emerging fields such as molecular genetics, genomics, and environmental toxicology, Biology of the Three-Spined Stickleback examines data from researchers who use studies of the stickleback to address a wide range of biological issues. This state-of-the-art volume
Behavioral and Neural Genetics of Zebrafish assembles the state-of-the-art methodologies and current concepts pertinent to their neurobehavioral genetics. Discussing their natural behavior, motor function, learning and memory, this book focuses on the fry and adult zebrafish, featuring a comprehensive account of modern genetic and neural methods adapted to, or specifically developed for, Danio rerio. Numerous examples of how these behavioral methods may be utilized for disease models using the zebrafish are presented, as is a section on bioinformatics and "big-data" related questions. - Provides the most comprehensive snapshot of the fast-evolving zebrafish neurobehavior genetics field - Describes behavioral, genetic and neural methods and concepts for use in adult and larval zebrafish - Features examples of zebrafish models of human central nervous system disorders - Discusses bioinformatics questions pertinent to zebrafish neurobehavioral genetics
The Zebrafish in Biomedical Research: Biology, Husbandry, Diseases, and Research Applications is a comprehensive work that fulfills a critical need for a thorough compilation of information on this species. The text provides significant updates for working vivarium professionals maintaining zebrafish colonies, veterinarians responsible for their care and well-being, zoologists and ethologists studying the species, and investigators using the species to gain critical insights into human physiology and disease. As the zebrafish has become an important model organism for the study of vertebrate development and disease, organ function, behavior, toxicology, cancer, and drug discovery, this book presents an important resource for future research. - Presents a complete view of the zebrafish, covering their biology, husbandry, diseases and research applications - Includes the work of world-renowned authors - Provides the first authoritative and comprehensive treatment of zebrafish in biomedical research as part of the ACLAM series
The most comprehensive and integrated book on pigmentation The Pigmentary System, Second Edition, gathers into one convenient, all-inclusive volume a wealth of information about the science of pigmentation and all the common and rare clinical disorders that affect skin color. The two parts, physiology (science) and pathophysiology (clinical disorders), are complementary and annotated so that those reading one part can easily refer to relevant sections in the other. For the clinician interested in common or rare pigment disorders or the principles of teaching about such disorders, this book provides an immediate and complete resource on the biologic bases for these disorders. For the scientist studying the biology of melanocyte function, the book provides a list of disorders that are related to basic biological functions of melanocytes. New features of this Second Edition include: Completely new section on the basic science of pigmentation – explaining the integration of melanocyte functions with other epidermal cells and with various organ systems like the immune system New chapters on pigmentary disorders related to intestinal diseases, the malignant melanocyte, benign proliferations of melanocytes (nevi) and phototherapy with narrow band UV All clinical chapters include the latest genetic findings and advances in therapy More than 400 color images of virtually all clinical disorders The book is ideal for all dermatologists and especially those interested in disorders of pigmentation. It is of particular use for pediatric dermatologists and medical geneticists caring for patients with congenital and genetic pigmentary disorders. This authoritative volume will fill the gap for dermatology training programs that do not have local experts on pigmentation. Basic and cosmetic scientists studying pigmentation and melanocytes will find the science and clinical correlations very useful in showing human significance and relevance to the results of their studies.
This 1999 edition of The Neural Crest contains comprehensive information about the neural crest, a structure unique to the vertebrate embryo, which has only a transient existence in early embryonic life. The ontogeny of the neural crest embodies the most important issues in developmental biology, as the neural crest is considered to have played a crucial role in evolution of the vertebrate phylum. Data that analyse neural crest ontogeny in murine and zebrafish embryos have been included in this revision. This revised edition also takes advantage of recent advances in our understanding of markers of neural crest cell subpopulations, and a full chapter is now devoted to cell lineage analysis. The major research breakthrough since the first edition has been the introduction of molecular biology to neural crest research, enabling an elucidation of many molecular mechanisms of neural crest development. This book is essential reading for students and researchers in developmental biology, cell biology, and neuroscience.
The past decade has seen a rapid accumulation of knowledge on the behavioral characteristics of zebrafish, and increased investigation into the neurobiological basis of behavior using zebrafish. This simple vertebrate represents an ideal compromise between system complexity and practical simplicity, with its mammalian sequence homology, fecundity, and conveniently small size and transparent embryology. Behavioral and Neural Genetics of Zebrafish assembles state of the art methodologies and the most current concepts pertinent to the neurobehavioral genetics of zebrafish. Discussing its natural behavior, motor function, and learning and memory, it focuses on the fry and adult zebrafish and features a comprehensive account of modern genetic and neural methods adapted to or specifically developed for Danio rerio. Numerous examples of how these behavioral methods may be utilized for disease models using the zebrafish will be presented, as well as a section on bioinformatics and "big-data" related questions. Focusing on this excellent translational tool, this book examines a species with which investigators may model and analyze even such complex human diseases as those associated with brain dysfunction. Provides the most comprehensive snapshot of the fast-evolving zebrafish neurobehavior genetics field Describes description of behavioral, genetic, and neural methods and concepts and adult and larval zebrafish Features examples of zebrafish models of human central nervous system disorders Discusses bioinformatics questions pertinent to zebrafish neurobehavioral genetics