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Related Concept Videos

Determination01:51

Determination

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 contrast, determination...
Morphogenesis02:19

Morphogenesis

Plant morphogenesis—the development of a plant’s form and structure—involves several overlapping developmental processes, including growth and cell differentiation. Precursor cells differentiate into specific cell types, which are organized into the tissues and organ systems that make up the functional plant.

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Optogenetic Signaling Activation in Zebrafish Embryos
07:18

Optogenetic Signaling Activation in Zebrafish Embryos

Published on: October 27, 2023

Robust generation and decoding of morphogen gradients.

Naama Barkai1, Ben-Zion Shilo

  • 1Department of Molecular Genetics, Weizmann Institute of Science, Rehovot, Israel. naama.barkai@weizmann.ac.il <naama.barkai@weizmann.ac.il>

Cold Spring Harbor Perspectives in Biology
|January 13, 2010
PubMed
Summary
This summary is machine-generated.

Morphogen gradients ensure precise embryonic development. Mechanisms like self-enhanced degradation and shuttling buffer these gradients against variations, ensuring accurate cell differentiation and patterning.

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Area of Science:

  • Developmental Biology
  • Systems Biology
  • Biophysics

Background:

  • Morphogen gradients are crucial for precise cell differentiation and embryonic patterning.
  • Maintaining gradient precision is vital despite environmental and genetic variations.

Purpose of the Study:

  • To discuss mechanisms that ensure the robustness of morphogen gradients.
  • To explore how these gradients are buffered against fluctuations in production and gene dosage.
  • To examine the transformation of smooth gradients into sharp gene expression borders.

Main Methods:

  • Theoretical discussion of buffering mechanisms.
  • Analysis of self-enhanced morphogen degradation.
  • Description of pre-steady-state decoding and shuttling mechanisms.
  • Consideration of integration theory and experimental data.

Main Results:

  • Self-enhanced degradation and pre-steady-state decoding buffer morphogen profiles against production rate variations.
  • A shuttling mechanism creates robust activation profiles and adjusts to embryo size.
  • Integration theory and experiments reveal system-level functioning in pattern formation.

Conclusions:

  • Robust mechanisms exist to maintain morphogen gradient precision during development.
  • These mechanisms ensure reproducible patterning despite biological variability.
  • Understanding these systems is key to deciphering developmental processes.