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  • 1
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    A genomic regulatory network for development (2002)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 2002-03-02
    Description: Development of the body plan is controlled by large networks of regulatory genes. A gene regulatory network that controls the specification of endoderm and mesoderm in the sea urchin embryo is summarized here. The network was derived from large-scale perturbation analyses, in combination with computational methodologies, genomic data, cis-regulatory analysis, and molecular embryology. The network contains over 40 genes at present, and each node can be directly verified at the DNA sequence level by cis-regulatory analysis. Its architecture reveals specific and general aspects of development, such as how given cells generate their ordained fates in the embryo and why the process moves inexorably forward in developmental time.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Davidson, Eric H -- Rast, Jonathan P -- Oliveri, Paola -- Ransick, Andrew -- Calestani, Cristina -- Yuh, Chiou-Hwa -- Minokawa, Takuya -- Amore, Gabriele -- Hinman, Veronica -- Arenas-Mena, Cesar -- Otim, Ochan -- Brown, C Titus -- Livi, Carolina B -- Lee, Pei Yun -- Revilla, Roger -- Rust, Alistair G -- Pan, Zheng jun -- Schilstra, Maria J -- Clarke, Peter J C -- Arnone, Maria I -- Rowen, Lee -- Cameron, R Andrew -- McClay, David R -- Hood, Leroy -- Bolouri, Hamid -- GM-61005/GM/NIGMS NIH HHS/ -- HD-37105/HD/NICHD NIH HHS/ -- RR-06591/RR/NCRR NIH HHS/ -- RR-15044/RR/NCRR NIH HHS/ -- New York, N.Y. -- Science. 2002 Mar 1;295(5560):1669-78.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Division of Biology, California Institute of Technology, Pasadena, CA 91125, USA. davidson@caltech.edu〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/11872831" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Cell Lineage ; Computational Biology ; Embryonic Development ; Endoderm/cytology/*physiology ; Gene Expression Profiling ; *Gene Expression Regulation, Developmental ; Genes, Regulator ; *Genome ; Mesoderm/cytology/*physiology ; Models, Biological ; Models, Genetic ; Morphogenesis ; Regulatory Sequences, Nucleic Acid ; Sea Urchins/*embryology/*genetics ; Stem Cells/physiology ; Systems Theory
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
    Published by American Association for the Advancement of Science (AAAS)
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  • 2
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    Organization of an echinoderm Hox gene cluster (1999)
    National Academy of Sciences
    Details
    Publication Date: 1999-02-16
    Print ISSN: 0027-8424
    Electronic ISSN: 1091-6490
    Topics: Biology , Medicine , Natural Sciences in General
    Published by National Academy of Sciences
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  • 3
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    Expression of the Hox gene complex in the indirect development of a sea urchin (1998)
    National Academy of Sciences
    Details
    Publication Date: 1998-10-27
    Print ISSN: 0027-8424
    Electronic ISSN: 1091-6490
    Topics: Biology , Medicine , Natural Sciences in General
    Published by National Academy of Sciences
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  • 4
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    Spatial expression of Hox cluster genes in the ontogeny of a sea urchin (2000)
    In:  Other Sources
    Details
    Publication Date: 2011-08-24
    Description: The Hox cluster of the sea urchin Strongylocentrous purpuratus contains ten genes in a 500 kb span of the genome. Only two of these genes are expressed during embryogenesis, while all of eight genes tested are expressed during development of the adult body plan in the larval stage. We report the spatial expression during larval development of the five 'posterior' genes of the cluster: SpHox7, SpHox8, SpHox9/10, SpHox11/13a and SpHox11/13b. The five genes exhibit a dynamic, largely mesodermal program of expression. Only SpHox7 displays extensive expression within the pentameral rudiment itself. A spatially sequential and colinear arrangement of expression domains is found in the somatocoels, the paired posterior mesodermal structures that will become the adult perivisceral coeloms. No such sequential expression pattern is observed in endodermal, epidermal or neural tissues of either the larva or the presumptive juvenile sea urchin. The spatial expression patterns of the Hox genes illuminate the evolutionary process by which the pentameral echinoderm body plan emerged from a bilateral ancestor.
    Keywords: Life Sciences (General)
    Type: Development (Cambridge, England) (ISSN 0950-1991); Volume 127; 21; 4631-43
    Format: text
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  • 5
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    The A/P axis in echinoderm ontogeny and evolution: evidence from fossils and molecules (2000)
    In:  Other Sources
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    Publication Date: 2011-08-24
    Description: Even though echinoderms are members of the Bilateria, the location of their anterior/posterior axis has remained enigmatic. Here we propose a novel solution to the problem employing three lines of evidence: the expression of a posterior class Hox gene in the coeloms of the nascent adult body plan within the larva; the anatomy of certain early fossil echinoderms; and finally the relation between endoskeletal plate morphology and the associated coelomic tissues. All three lines of evidence converge on the same answer, namely that the location of the adult mouth is anterior, and the anterior/posterior axis runs from the mouth through the adult coelomic compartments. This axis then orients the animal such that there is but a single plane of symmetry dividing the animal into left and right halves. We tentatively hypothesize that this plane of symmetry is positioned along the dorsal/ventral axis. These axis identifications lead to the conclusion that the five ambulacra are not primary body axes, but instead are outgrowths from the central anterior/posterior axis. These identifications also shed insight into several other evolutionary mysteries of various echinoderm clades such as the independent evolution of bilateral symmetry in irregular echinoids, but do not elucidate the underlying mechanisms of the adult coelomic architecture.
    Keywords: Life Sciences (General)
    Type: Evolution & development (ISSN 1520-541X); Volume 2; 2; 93-101
    Format: text
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