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Related Concept Videos

Gastrulation01:56

Gastrulation

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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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Related Experiment Video

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Tracking and Quantifying Developmental Processes in C. elegans Using Open-source Tools
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Inferring temporal organization of postembryonic development from high-content behavioral tracking.

Denis F Faerberg1, Victor Gurarie2, Ilya Ruvinsky1

  • 1Department of Molecular Biosciences, Northwestern University, Evanston, IL, 60208, USA.

Developmental Biology
|February 26, 2021
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Summary
This summary is machine-generated.

Developmental timing varies between individuals. In C. elegans, early larval stages (L1-L3) correlate, but the L4 stage is independent, suggesting distinct developmental phases.

Keywords:
C. elegansDevelopmental timingLarvalPostembryonicVariability

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Area of Science:

  • Developmental biology
  • Chronobiology
  • Animal behavior

Background:

  • Understanding temporal regulation in development is crucial.
  • While average developmental timing is known, inter-individual variability is less understood.
  • Postembryonic development in *Caenorhabditis elegans* offers a model to study developmental timing.

Purpose of the Study:

  • To investigate inter-individual variability and correlations in the timing of postembryonic developmental events.
  • To analyze the durations of larval stages in *Caenorhabditis elegans*.
  • To identify distinct phases of postembryonic development based on timing variability.

Main Methods:

  • Inferred larval stage durations (L1-L4) from locomotor activity patterns.
  • Analyzed data from over 100 freely moving *Caenorhabditis elegans* individuals.
  • Examined correlations between durations of successive larval stages.

Main Results:

  • Individual development rates are consistent due to positive correlations in L1-L3 durations.
  • The L4 larval stage shows less variability and is largely independent of earlier development rates.
  • Larval stage durations exhibit scaling relative to total developmental time.

Conclusions:

  • Postembryonic development in *C. elegans* comprises at least two distinct temporal epochs: early (L1-L3) and late (L4).
  • Stage duration appears regulated by the completion of specific developmental events rather than fixed time.
  • The described method provides a scalable platform for studying developmental timing.