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Related Concept Videos

Master Transcription Regulators02:23

Master Transcription Regulators

Master transcription regulators are regulatory proteins that are predominantly responsible for regulating the expression of multiple genes. Often these genes work in concert to drive a  complex process. Activation of a master transcription regulator can lead to a cascade of transcriptional activation necessary for that outcome. These regulators can directly bind to the regulatory sequences of the various genes involved, or they can indirectly regulate transcription by binding to regulatory...
Master Transcription Regulators02:23

Master Transcription Regulators

Master transcription regulators are regulatory proteins that are predominantly responsible for regulating the expression of multiple genes. Often these genes work in concert to drive a  complex process. Activation of a master transcription regulator can lead to a cascade of transcriptional activation necessary for that outcome. These regulators can directly bind to the regulatory sequences of the various genes involved, or they can indirectly regulate transcription by binding to regulatory...
What is Gene Expression?01:42

What is Gene Expression?

Overview
Gene expression is the process in which DNA directs the synthesis of functional products, that is, proteins. Cells can regulate gene expression at various stages. It allows organisms to generate different cell types and enables cells to adapt to internal and external factors.
Genetic Information Flows from DNA to RNA to Protein
A gene is a stretch of DNA that serves as the blueprint for functional RNAs and proteins. Since DNA is made up of nucleotides and proteins consist of amino...
What is Gene Expression?01:36

What is Gene Expression?

A gene is a stretch of DNA that serves as the blueprint for functional RNAs and proteins. Since DNA is comprised  of nucleotides and proteins are comprised of amino acids, a mediator is required to convert the information encoded in DNA into proteins. This mediator is the messenger RNA (mRNA). mRNA copies the blueprint from DNA by a process called transcription. In eukaryotes, transcription occurs in the nucleus by complementary base-pairing with the DNA template. The mRNA is then processed and...
Position-effect Variegation02:32

Position-effect Variegation

In 1928, a German botanist Emil Heitz observed the moss nuclei with a DNA binding dye. He observed that while some chromatin regions decondense and spread out in the interphase nucleus, others do not. He termed them euchromatin and heterochromatin, respectively. He proposed that the heterochromatin regions reflect a functionally inactive state of the genome. It was later confirmed that heterochromatin is transcriptionally repressed, and euchromatin is transcriptionally active chromatin.
RNA Polymerase II Accessory Proteins02:36

RNA Polymerase II Accessory Proteins

Proteins that regulate transcription can do so either via direct contact with RNA Polymerase or through indirect interactions facilitated by adaptors, mediators, histone-modifying proteins, and nucleosome remodelers. Direct interactions to activate transcription is seen in bacteria as well as in some eukaryotic genes. In these cases, upstream activation sequences are adjacent to the promoters, and the activator proteins interact directly with the transcriptional machinery. For example, in...

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Related Experiment Video

Updated: May 28, 2026

Using Confocal Analysis of Xenopus laevis to Investigate Modulators of Wnt and Shh Morphogen Gradients
08:10

Using Confocal Analysis of Xenopus laevis to Investigate Modulators of Wnt and Shh Morphogen Gradients

Published on: December 14, 2015

Morphogen gradients: expand and repress.

Simon Restrepo1, Konrad Basler

  • 1Institute of Molecular Life Sciences, University of Zürich, Winterthurerstr. 190, CH-8057 Zürich, Switzerland.

Current Biology : CB
|October 15, 2011
PubMed
Summary
This summary is machine-generated.

Researchers have uncovered the molecular basis of a postulated expansion-repression mechanism. This mechanism allows morphogen gradients to adjust to organism size and growth.

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Last Updated: May 28, 2026

Using Confocal Analysis of Xenopus laevis to Investigate Modulators of Wnt and Shh Morphogen Gradients
08:10

Using Confocal Analysis of Xenopus laevis to Investigate Modulators of Wnt and Shh Morphogen Gradients

Published on: December 14, 2015

Optogenetic Signaling Activation in Zebrafish Embryos
07:18

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Published on: October 27, 2023

Light-mediated Reversible Modulation of the Mitogen-activated Protein Kinase Pathway during Cell Differentiation and Xenopus Embryonic Development
09:32

Light-mediated Reversible Modulation of the Mitogen-activated Protein Kinase Pathway during Cell Differentiation and Xenopus Embryonic Development

Published on: June 15, 2017

Area of Science:

  • Developmental biology
  • Molecular biology
  • Genetics

Background:

  • Morphogen gradients are crucial for embryonic development, guiding cell fate decisions.
  • Previous models proposed an expansion-repression mechanism to explain how gradients adapt to varying organism sizes.
  • The molecular underpinnings of this adaptive mechanism remained largely unknown.

Purpose of the Study:

  • To elucidate the molecular components and processes involved in the expansion-repression mechanism of morphogen gradients.
  • To provide a mechanistic explanation for how morphogen gradients scale with organism size and growth.

Main Methods:

  • Utilized genetic screens in model organisms to identify key regulatory genes.
  • Employed live imaging and quantitative analysis of fluorescently tagged proteins to observe gradient dynamics.
  • Performed molecular biology techniques such as gene knockouts and overexpression studies.

Main Results:

  • Identified specific genes and protein interactions that constitute the expansion-repression mechanism.
  • Demonstrated that these molecular players actively regulate the spatial distribution and concentration of morphogens.
  • Showcased how this mechanism ensures appropriate morphogen gradient formation across different developmental stages and sizes.

Conclusions:

  • The study reveals the molecular machinery driving the adaptive regulation of morphogen gradients.
  • This discovery provides critical insights into the robustness and scalability of developmental processes.
  • Understanding this mechanism has implications for developmental biology and regenerative medicine.