New Perspectives on Eye Development and the Evolution of Eyes and Photoreceptors
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The Drosophila Eye
Downloaded from genesdev.cshlp.org on October 10, 2021 - Published by Cold Spring Harbor Laboratory Press mirror encodes a novel PBX-class homeoprotein that functions in the definition of the dorsal-ventral border in the Drosophila eye Helen McNeill, 1 Chung-Hui Yang, 1 Michael Brodsky, 2 Josette Ungos, ~ and Michael A. Simon ~'3 1Department of Biological Sciences, Stanford University, Stanford, California 94305 USA; ZDepartment of Biology, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139 USA The Drosophila eye is composed of dorsal and ventral mirror-image fields of opposite chiral forms of ommatidia. The boundary between these fields is known as the equator. We describe a novel gene, mirror (mrr), which is expressed in the dorsal half of the eye and plays a key role in forming the equator. Ectopic equators can be generated by juxtaposing mrr expressing and nonexpressing cells, and the path of the normal equator can be altered by changing the domain of mrr expression. These observations suggest that mrr is a key component in defining the dorsal-ventral boundary of tissue polarity in the eye. In addition, loss of mrr function leads to embryonic lethality and segmental defects, and its expression pattern suggests that it may also act to define segmental borders. Mirror is a member of the class of homeoproteins defined by the human proto-oncogene PBX1. mrr is similar to the Iroquois genes ara and caup and is located adjacent to them in this recently described homeotic cluster. [Key Words: Drosophila; eye development; polarity; compartment; border] Received January 14, 1997; revised version accepted March 4, 1997. -
The Complexity and Origins of the Human Eye: a Brief Study on the Anatomy, Physiology, and Origin of the Eye
Running Head: THE COMPLEX HUMAN EYE 1 The Complexity and Origins of the Human Eye: A Brief Study on the Anatomy, Physiology, and Origin of the Eye Evan Sebastian A Senior Thesis submitted in partial fulfillment of the requirements for graduation in the Honors Program Liberty University Spring 2010 THE COMPLEX HUMAN EYE 2 Acceptance of Senior Honors Thesis This Senior Honors Thesis is accepted in partial fulfillment of the requirements for graduation from the Honors Program of Liberty University. ______________________________ David A. Titcomb, PT, DPT Thesis Chair ______________________________ David DeWitt, Ph.D. Committee Member ______________________________ Garth McGibbon, M.S. Committee Member ______________________________ Marilyn Gadomski, Ph.D. Assistant Honors Director ______________________________ Date THE COMPLEX HUMAN EYE 3 Abstract The human eye has been the cause of much controversy in regards to its complexity and how the human eye came to be. Through following and discussing the anatomical and physiological functions of the eye, a better understanding of the argument of origins can be seen. The anatomy of the human eye and its many functions are clearly seen, through its complexity. When observing the intricacy of vision and all of the different aspects and connections, it does seem that the human eye is a miracle, no matter its origins. Major biological functions and processes occurring in the retina show the intensity of the eye’s intricacy. After viewing the eye and reviewing its anatomical and physiological domain, arguments regarding its origins are more clearly seen and understood. Evolutionary theory, in terms of Darwin’s thoughts, theorized fossilization of animals, computer simulations of eye evolution, and new research on supposed prior genes occurring in lower life forms leading to human life. -
Semaphorin3a/Neuropilin-1 Signaling Acts As a Molecular Switch Regulating Neural Crest Migration During Cornea Development
Developmental Biology 336 (2009) 257–265 Contents lists available at ScienceDirect Developmental Biology journal homepage: www.elsevier.com/developmentalbiology Semaphorin3A/neuropilin-1 signaling acts as a molecular switch regulating neural crest migration during cornea development Peter Y. Lwigale a,⁎, Marianne Bronner-Fraser b a Department of Biochemistry and Cell Biology, MS 140, Rice University, P.O. Box 1892, Houston, TX 77251, USA b Division of Biology, 139-74, California Institute of Technology, Pasadena, CA 91125, USA article info abstract Article history: Cranial neural crest cells migrate into the periocular region and later contribute to various ocular tissues Received for publication 2 April 2009 including the cornea, ciliary body and iris. After reaching the eye, they initially pause before migrating over Revised 11 September 2009 the lens to form the cornea. Interestingly, removal of the lens leads to premature invasion and abnormal Accepted 6 October 2009 differentiation of the cornea. In exploring the molecular mechanisms underlying this effect, we find that Available online 13 October 2009 semaphorin3A (Sema3A) is expressed in the lens placode and epithelium continuously throughout eye development. Interestingly, neuropilin-1 (Npn-1) is expressed by periocular neural crest but down- Keywords: Semaphorin3A regulated, in a manner independent of the lens, by the subpopulation that migrates into the eye and gives Neuropilin-1 rise to the cornea endothelium and stroma. In contrast, Npn-1 expressing neural crest cells remain in the Neural crest periocular region and contribute to the anterior uvea and ocular blood vessels. Introduction of a peptide that Cornea inhibits Sema3A/Npn-1 signaling results in premature entry of neural crest cells over the lens that Lens phenocopies lens ablation. -
Neural Crest Cells Organize the Eye Via TGF-Β and Canonical Wnt Signalling
ARTICLE Received 18 Oct 2010 | Accepted 9 Mar 2011 | Published 5 Apr 2011 DOI: 10.1038/ncomms1269 Neural crest cells organize the eye via TGF-β and canonical Wnt signalling Timothy Grocott1, Samuel Johnson1, Andrew P. Bailey1,† & Andrea Streit1 In vertebrates, the lens and retina arise from different embryonic tissues raising the question of how they are aligned to form a functional eye. Neural crest cells are crucial for this process: in their absence, ectopic lenses develop far from the retina. Here we show, using the chick as a model system, that neural crest-derived transforming growth factor-βs activate both Smad3 and canonical Wnt signalling in the adjacent ectoderm to position the lens next to the retina. They do so by controlling Pax6 activity: although Smad3 may inhibit Pax6 protein function, its sustained downregulation requires transcriptional repression by Wnt-initiated β-catenin. We propose that the same neural crest-dependent signalling mechanism is used repeatedly to integrate different components of the eye and suggest a general role for the neural crest in coordinating central and peripheral parts of the sensory nervous system. 1 Department of Craniofacial Development, King’s College London, Guy’s Campus, London SE1 9RT, UK. †Present address: NIMR, Developmental Neurobiology, Mill Hill, London NW7 1AA, UK. Correspondence and requests for materials should be addressed to A.S. (email: [email protected]). NatURE COMMUNicatiONS | 2:265 | DOI: 10.1038/ncomms1269 | www.nature.com/naturecommunications © 2011 Macmillan Publishers Limited. All rights reserved. ARTICLE NatUre cOMMUNicatiONS | DOI: 10.1038/ncomms1269 n the vertebrate head, different components of the sensory nerv- ous system develop from different embryonic tissues. -
Emanuele Serrelli Nathalie Gontier Editors Explanation, Interpretation
Interdisciplinary Evolution Research 2 Emanuele Serrelli Nathalie Gontier Editors Macroevolution Explanation, Interpretation and Evidence Interdisciplinary Evolution Research Volume 2 Series editors Nathalie Gontier, Lisbon, Portugal Olga Pombo, Lisbon, Portugal [email protected] About the Series The time when only biologists studied evolution has long since passed. Accepting evolution requires us to come to terms with the fact that everything that exists must be the outcome of evolutionary processes. Today, a wide variety of academic disciplines are therefore confronted with evolutionary problems, ranging from physics and medicine, to linguistics, anthropology and sociology. Solving evolutionary problems also necessitates an inter- and transdisciplinary approach, which is why the Modern Synthesis is currently extended to include drift theory, symbiogenesis, lateral gene transfer, hybridization, epigenetics and punctuated equilibria theory. The series Interdisciplinary Evolution Research aims to provide a scholarly platform for the growing demand to examine specific evolutionary problems from the perspectives of multiple disciplines. It does not adhere to one specific academic field, one specific school of thought, or one specific evolutionary theory. Rather, books in the series thematically analyze how a variety of evolutionary fields and evolutionary theories provide insights into specific, well-defined evolutionary problems of life and the socio-cultural domain. Editors-in-chief of the series are Nathalie Gontier and Olga Pombo. The -
Stages of Embryonic Development of the Zebrafish
DEVELOPMENTAL DYNAMICS 2032553’10 (1995) Stages of Embryonic Development of the Zebrafish CHARLES B. KIMMEL, WILLIAM W. BALLARD, SETH R. KIMMEL, BONNIE ULLMANN, AND THOMAS F. SCHILLING Institute of Neuroscience, University of Oregon, Eugene, Oregon 97403-1254 (C.B.K., S.R.K., B.U., T.F.S.); Department of Biology, Dartmouth College, Hanover, NH 03755 (W.W.B.) ABSTRACT We describe a series of stages for Segmentation Period (10-24 h) 274 development of the embryo of the zebrafish, Danio (Brachydanio) rerio. We define seven broad peri- Pharyngula Period (24-48 h) 285 ods of embryogenesis-the zygote, cleavage, blas- Hatching Period (48-72 h) 298 tula, gastrula, segmentation, pharyngula, and hatching periods. These divisions highlight the Early Larval Period 303 changing spectrum of major developmental pro- Acknowledgments 303 cesses that occur during the first 3 days after fer- tilization, and we review some of what is known Glossary 303 about morphogenesis and other significant events that occur during each of the periods. Stages sub- References 309 divide the periods. Stages are named, not num- INTRODUCTION bered as in most other series, providing for flexi- A staging series is a tool that provides accuracy in bility and continued evolution of the staging series developmental studies. This is because different em- as we learn more about development in this spe- bryos, even together within a single clutch, develop at cies. The stages, and their names, are based on slightly different rates. We have seen asynchrony ap- morphological features, generally readily identi- pearing in the development of zebrafish, Danio fied by examination of the live embryo with the (Brachydanio) rerio, embryos fertilized simultaneously dissecting stereomicroscope. -
Lynn Margulis and Dorion Sagan, Acquiring Genomes
CONTENTS Forewordby Ernst Mayr XI xv CaJ1•1thtO JOOJ by lfnn M.,1i1ll1111J l>nrlun S1tc11n Preface Pulttl1h,Jby 1111k Rook,, PART ONE. THE EVOLUTIONARY IMPERATIVE AM,mber of rh, l'wucu1Book, Group. 1 Darwinism Not Neodarwinism 3 Allrlahu re1crved. Printed in the United States of America. No part of this book may be 2 Darwin's Dilemma 25 rc~r<>ducedin any manner whatsoever without written permission except in the case of 3 Relative Individuality 51 briefquotations embodied in critical articles and reviews.For information, address Basic 67 Books, 387 Park Avenue South, New York NY 10016-8810. 4 The Natural Selector 5 Principles of Evolutionary Novelty 71 Library of Congress Cataloging-in-Publication Data PART TWO. THE MICROBE IN EVOLUTION Margulis, Lynn, 1938- Acquiring genomes : a theory of the origins of species / Lynn Margulis and Dorion 6 Species and Cells 81 Sagan.-lst ed. 7 History of the Heritable 89 p. cm. Includes bibiliographical references PART THREE. PLANETARY LEGACY ISBN 0-465-04391-7 (hardcover) 1. Species. 2. Symbiogenesis. 3. Evolution (Biology). 4. Sagan Dorion 1959- II 123 Title. ' ' . 8 Gaian Planet 139 QH380 .M37 2002 9 Eukaryosis in an Anoxic World 576.8'6-dc21 2002001521 PART FOUR. CONSORTIA 165 Text design by TrishWilkimon 10 Seaworthy Alliances Set in 12.5-point AGaramond by The Perseus Books Group 11 Plant Proclivities 185 12 Chromosome Dance: The Fission Theory 191 FIRST EDITION 13 Darwin Revisited: 02 03 04 05 / IO 9 8 7 6 5 4 3 2 1 Spedes in the Evolutionary Dialogue 201 ..•,, •HI /,,/tit,,,,,,/ 1//11,11,111,,,,, -
Molecular Evolution of Color Vision in Vertebrates
Gene 300 (2002) 69–78 www.elsevier.com/locate/gene Molecular evolution of color vision in vertebrates Shozo Yokoyama* Department of Biology, Biological Research Laboratories, Syracuse University, 130 College Place, Syracuse, NY 13244, USA Received 10 December 2001; received in revised form 4 March 2002; accepted 17 July 2002 Abstract Visual systems of vertebrates exhibit a striking level of diversity, reflecting their adaptive responses to various color environments. The photosensitive molecules, visual pigments, can be synthesized in vitro and their absorption spectra can be determined. Comparing the amino acid sequences and absorption spectra of various visual pigments, we can identify amino acid changes that have modified the absorption spectra of visual pigments. These hypotheses can then be tested using the in vitro assay. This approach has been a powerful tool in elucidating not only the molecular bases of color vision, but the processes of adaptive evolution at the molecular level. q 2002 Elsevier Science B.V. All rights reserved. Keywords: Visual pigment; Wavelength absorption; Color vision; Vertebrate 1. Introduction visual pigments, it was necessary to clone opsin genes. This was initiated in 1986 when the opsin genes were cloned Vision has profound effects on the evolution of from cow and human (Nathans and Hogness, 1983, 1984; organisms by affecting survivorship through such behaviors Nathans et al., 1986). The availability of these opsin clones as mating, foraging, and predator avoidance. The data led to the isolation of other orthologous and paralogous collected by vision scientists over the last century genes from various species. Second, in the late 1980s, it demonstrate beyond any doubt that ecology has been a became possible to express opsins in cultured cells, major factor in directing the evolution of visual systems reconstitute with 11-cis-retinal, and measure the absorption (Walls, 1942; Lythgoe, 1979; Jacobs, 1981; Bowmaker, spectra of the resulting visual pigments in vitro (Oprian 1991; Yokoyama and Yokoyama, 1996). -
Evolutionary Theory: the Basics
Evolutionary Theory: The Basics Cogs 184 * Modeling Cognitive Evolution When constructing an evolutionary scenario… …need to understand, apply Biological Principles! Some Basic Concepts • Geneotype • The organism's genetic makeup • Mostly recipes for building proteins • Alleles (versions) of a gene can be dom/recessive • Phenotype • The organism's physical & behavioral characteristics Some Basic Concepts • Most phenotypic traits are polygenetic • e.g. Even eye color requires 6 genes to code for • So how silly is it to discuss/seek "the language gene" FoxP2 Gene Some Basic Concepts • Most phenotypic traits are polygenetic • e.g. Even eye color requires 6 genes to code for • So how silly is it to discuss/seek "the language gene" • Altho sometimes one small genetic change >> huge phenotypic effects • A change in a CONTROL gene (Operator, Supressor) • Can alter timing, order of processes • e.g. During brain development, cells first duplicate, then differentiate • By suppressing onset of differentiation, duplication continues longer >> can triple brain size! Some Basic Concepts • Because genetic material not generally available in fossils... • Although note recent Neanderthal discovery! • We will mainly use phenotypic traits as the basis for our evolutionary scenarios • Note: This will mean ASSUMING those traits are HERETABLE!! • "Heretiability" mainly genetic • We will later also discuss MEMES passed to next generation • Meme = cultural unit of selection • Religious practice • Writing • Democracy, etc. etc. Evolution by Natural Selection Charles Darwin Evolution by Natural Selection 1) Variability, across a population, in a heritable trait • Some sources of variance: • Recombination, Mutation (e.g. Insertion, Translocation), etc. Evolution by Natural Selection 1) Variability, across a population, in a heritable trait • Some sources of variance: • Recombination, Mutation (e.g. -
The Unsuspected Intrinsic Property of Melanin to Dissociate the Water Molecule
MOJ Cell Science & Report Research Article Open Access Towards a new ophthalmic biology and physiology: the unsuspected intrinsic property of melanin to dissociate the water molecule Abstract Volume 4 Issue 2 - 2017 The development and evolution of eyes is ancient and difficult problem in biology. Arturo Solis Herrera Darwin postulated a prototype eye which can evolve under natural selection. Neo- Director, Human Photosynthesis® Research Center, México Darwinists, based in morphological criteria, have postulated a polyphyletic origin that has evolved independently in the various animal phyla. Molecular phylogenetic Correspondence: Arturo Solis Herrera, Director, Human analyses and developmental genetic experiments, cast serious doubts on both Photosynthesis® Research Center, México, theories. The study of the development of the eye in the amphibian embryo has been Email [email protected] a formidable tool research to experimental embryology and evolutionary biology as early as 1901. The embryonic induction, the interactions between different embryonic Received: March 07, 2017 | Published: April 27, 2017 tissues (organizers); and the role of genes, were conceived as result of reciprocal transplantation experiments. The classical description is that the eye in vertebrates develops from the neural plate, as an evagination from the brain, forming the optic vesicle; which subsequently invaginates to form the optic cup. The inner layer of the optic cup forms the retina with its photoreceptor layers, whereas the outer layer gives rise to the pigment epithelium which absorbs the light in the back of the retina. However, failed to recognize the importance of melanin pigment. The mammalian eye consists of several layers that contain melanin, 40 % more than skin in average. -
I. Eye Development
Sara Thomasy DVM, PhD, DACVO Mouse Day 8 Dog Day 11 Eye Fields Mouse Day 7 Dog Day 10 Prosencephalon https://syllabus.med.unc.edu/courseware/embryo_images/unit-eye/eye_htms/eyetoc.htm Mouse Day 8 Dog Day 12 Cyclopia Cyclopia - Formation of a single median globe Synophthalmia – Two incompletely separated or fused globes Concurrent severe craniofacial defects Veratrum californicum . Day 14 of gestation in sheep Steroidal alkaloids . Cyclopamine and jervine . Inhibit sonic hedgehog signal transduction during gastrulation Affects midline neural plate Corn Lily or False Hellebore Day 15 Optic vesicle Mouse Day 9.5 Optic stalk https://syllabus.med.unc.edu/courseware/embryo_images/unit-eye/eye_htms/eyetoc.htm Mouse Day 9.5 Dog Day 15 Optic vesicle Microphthalmia Optic stalk https://syllabus.med.unc.edu/courseware/embryo_images/unit-eye/eye_htms/eyetoc.htm Optic vesicle deficiency Corresponding small palpebral fissure Failure of normal optic cup growth . Failure of fusion of the choroid fissure → colobomas . Failure to establish normal IOP Associated with a myriad of ocular defects ASD PHPV Neural plate deficiency Cataract Retinal dysplasia Colobomatous malformations Merle ocular dysgenesis Intraretinal space Mouse Day 11 Dog Day 18 https://syllabus.med.unc.edu/courseware/embryo_images/unit-eye/eye_htms/eyetoc.htm Mouse Day 11 Iris coloboma Dog Day 18 https://syllabus.med.unc.edu/courseware/embryo_images/unit-eye/eye_htms/eyetoc.htm “Defect” Failure of fusion of the choroid fissure “Typical colobomas” at the 6 o’clock position Abnormal differentiation of the outer optic cup “Atypical colobomas” at other locations Charlois Collie Collie Day 25 Mouse Day 11 https://syllabus.med.unc.edu/courseware/embryo_images/unit-eye/eye_htms/eyetoc.htm Persistent keratolenticular attachment Classic example: Peter’s anomaly Corneal opacity with stromal & DM defects (B) Persistent pupillary membrane (A) . -
Darwin and the Evolution of The
Darwin and the evolution of the eye To celebrate the sesquicentennial of The Origin of Species, Nick Lane takes a look at what Charles Story Darwin did for the eye, and what he would love to know about eyes if he were still alive today Nick Lane Cover WHAT use is half an eye? No sentence is lens, cornea and all the other accoutrements Others are less more closely linked with Darwin’s doubters of eyes just get in the way of photons, they’re convinced, and point than that; and none is more likely to be simply stripped away. to the difficulties trotted out by the genuinely perplexed, involved in growing a those who accept that the eye evolved but Mechanical contrivances functional lens from can’t imagine how. And Richard Dawkins’s A naked retina is a sexier name for a light- scratch. The trilobites truculent riposte – “half an eye is precisely sensitive spot, which was Darwin’s own are a case in point: one per cent better than 49 per cent of an starting point for evolving the eye. He is often their lenses were eye” – doesn’t help those who can’t picture quoted deliberately out of context, even by formed not from half an eye. scientists seeking to solve Darwin’s ‘mystery’, crystallin proteins Ophthalmologists, of course, know all as saying, “to suppose that the eye evolved but from crystals of about half an eye – either the back half or by natural selection seems, I freely confess, calcite, clear rhombs the front. It has always amazed me how little absurd in the highest possible degree.” with specific optical cataract and refractive surgeons really need With the benefit of hindsight, that was an properties.