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Neurulation01:30

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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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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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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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The upper and lower limb initially develops as a small bulge called a limb bud, which appears on the lateral side of the early embryo. The upper limb bud appears near the end of the fourth week of development, with the lower limb bud appearing shortly after.
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Assessing Signaling Properties of Ectodermal Epithelia During Craniofacial Development
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Early inductive events in ectodermal appendage morphogenesis.

Leah C Biggs1, Marja L Mikkola1

  • 1Developmental Biology Program, Institute of Biotechnology, P.O. Box 56, University of Helsinki, 00014 Helsinki, Finland.

Seminars in Cell & Developmental Biology
|February 4, 2014
PubMed
Summary
This summary is machine-generated.

Early development of skin appendages like hair, teeth, and mammary glands shares common stages. This review details molecular and cellular processes driving these shared early developmental pathways in mammals.

Keywords:
BudDermal condensateEpithelial–mesenchymal interactionPlacodeSkin appendage

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Area of Science:

  • Developmental Biology
  • Ectodermal Appendage Formation
  • Molecular and Cellular Processes

Background:

  • The embryonic surface ectoderm forms the epidermis and various appendages, including hair follicles, teeth, and glands.
  • Early development involves conserved stages: induction, placode, and bud, before organ-specific morphogenesis.
  • Understanding these shared stages is crucial for deciphering diverse ectodermal organ formation.

Purpose of the Study:

  • To review current knowledge on molecular and cellular mechanisms governing shared early development of skin appendages.
  • To focus on hair follicles, teeth, and mammary glands as models for mammalian ectodermal organogenesis.
  • To integrate findings from mouse mutants and classic tissue recombination experiments with modern molecular insights.

Main Methods:

  • Review of existing literature, focusing on studies analyzing mouse mutants.
  • Reevaluation of classic epithelial-mesenchymal tissue recombination experiments.
  • Emphasis on identifying key signaling pathways and their downstream cellular effects.

Main Results:

  • Analysis of mouse mutants reveals conserved molecular and cellular processes in early appendage development.
  • Signaling pathways mediating epithelial-mesenchymal interactions are critical for shared developmental stages.
  • Specific signaling outputs correlate with cellular behaviors that shape developing organs.

Conclusions:

  • Shared molecular and cellular programs underlie the early development of diverse ectodermal appendages.
  • Understanding these conserved pathways provides a foundation for studying organogenesis of hair, teeth, and mammary glands.
  • Further research linking signaling to cellular behavior will elucidate the mechanisms of epithelial morphogenesis.