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Gastrulation establishes the three primary tissues of an embryo: the ectoderm, mesoderm, and endoderm. This developmental process relies on a series of intricate cellular movements, which in humans transforms a flat, “bilaminar disc” composed of two cell sheets into a three-tiered structure. In the resulting embryo, the endoderm serves as the bottom layer, and stacked directly above it is the intermediate mesoderm, and then the uppermost ectoderm. Respectively, these tissue strata...
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Development of the reproductive organs in an embryo starts from a bipotential state. This means the early embryo can develop either male or female reproductive organs. The formation of these organs begins with the growth of gonadal ridges that arise from the intermediate mesoderm during the fifth week of development.
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During embryogenesis, cells become progressively committed to different fates through a two-step process: specification followed by determination. Specification is demonstrated by removing a segment of an early embryo, “neutrally” culturing the tissue in vitro—for example, in a petri dish with simple medium—and then observing the derivatives. If the cultured region gives rise to cell types that it would normally generate in the embryo, this means that it is specified. In...
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Neurulation is the embryological process which forms the precursors of the central nervous system and occurs after gastrulation has established the three primary cell layers of the embryo: ectoderm, mesoderm, and endoderm. In humans, the majority of this system is formed via primary neurulation, in which the central portion of the ectoderm—originally appearing as a flat sheet of cells—folds upwards and inwards, sealing off to form a hollow neural tube. As development proceeds, the...
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The development of the vascular system in a fetus is a complex and intricate process that begins as early as 15 to 16 days post-conception. This process starts outside the embryo, specifically in the mesoderm of the yolk sac, chorion, and connecting stalk. Approximately two days later, the formation of blood vessels occurs within the embryo itself.
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After a large-single-celled zygote is produced via fertilization, the process of cleavage occurs while zygotes travel through the uterine tube. Cleavage is a mitotic cell division that does not result in growth. With each round of successive cell division, daughter cells get increasingly smaller.
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A stage and anatomy ontology for embryogenesis in indirect-developing echinoderms.

Charles A Ettensohn1, Macie M Chess1, Laurent Formery2

  • 1Department of Biological Sciences, Carnegie Mellon University, Pittsburgh, PA 15213, USA.

Development (Cambridge, England)
|February 20, 2026
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Summary

Researchers developed new developmental and anatomical ontologies for echinoderm embryogenesis. These ontologies standardize biological data, enhancing comparative analyses and the value of echinoderms as model organisms.

Keywords:
AsteroidCidaroidDevelopmentEchinodermEmbryoEuechinoidOntology

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Area of Science:

  • Developmental Biology
  • Comparative Genomics
  • Bioinformatics

Background:

  • Developmental and anatomical ontologies are crucial for standardizing biological data, enabling experimental reproducibility and data integration across species.
  • Echinoderms are important model organisms in developmental biology and evolutionary research, yet lack formalized ontologies.
  • Existing knowledgebases like Echinobase and Marimba require standardized data for effective curation and analysis.

Purpose of the Study:

  • To create formalized developmental and anatomical ontologies for the embryogenesis of indirect-developing echinoderms.
  • To develop a "pan-echinoderm" ontology supporting cross-species comparative analyses within the phylum.
  • To enhance the utility of echinoderms as model organisms by improving data standardization and accessibility.

Main Methods:

  • Direct observation of living embryos from five echinoderm species, representing euechinoids, cidaroids, and sea stars.
  • Development of species-specific developmental and anatomical ontologies based on empirical observations.
  • Integration of species-specific ontologies into a comprehensive "pan-echinoderm" ontology.

Main Results:

  • Formalized developmental and anatomical ontologies for echinoderm embryogenesis were established.
  • A novel "pan-echinoderm" ontology was created, facilitating comparative studies across the phylum.
  • The ontologies provide a standardized framework for data curation in Echinobase and Marimba.

Conclusions:

  • The developed ontologies are fundamental for standardizing echinoderm developmental and anatomical data.
  • These resources will significantly improve data integration, curation, and analysis for echinoderm research.
  • The ontologies enhance the value and application of echinoderms as model organisms in biological research.