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Related Concept Videos

Catenins01:23

Catenins

Catenins are characterized by multiple binding domains and dynamic structures that allow them to function as linker proteins in cell junction complexes. All catenins, except α-catenin, contain a characteristic protein sequence called the armadillo repeat and are therefore also called armadillo proteins.
Catenins in Cell Junctions
Catenins bind to cell adhesion molecules such as cadherins and link them to different cytoskeletal proteins depending on the type of cell junction. At the adherens...
Tension Response at Adherens Junctions01:26

Tension Response at Adherens Junctions

The adherens junctions that anchor cells together are multi-protein complexes that dynamically adapt to mechanical stimuli such as tensile forces and shear stress. Mechanosensory proteins in these junctions can sense such mechanical stimuli and undergo a shift in their conformation, resulting in an altered function — a process called mechanotransduction.
α-Catenin as a Mechanosensory Protein
The α-catenin of adherens junctions is an allosteric protein with three VH (vinculin homology) domains...
Non-Canonical Wnt Signaling Pathways01:41

Non-Canonical Wnt Signaling Pathways

Wnt is a zygotic effect gene that is expressed during very early embryonic development. It regulates various processes in animals starting from early development through the adult stage, such as organogenesis in the embryo and maintenance of neuronal and blood stem cells. Wnt proteins can induce a wide variety of intracellular pathways depending upon the specific abilities of different Wnt ligands to form a complex with shared and cognate receptors in the presence of different co-receptors. The...
Cadherins in Tissue Organization01:19

Cadherins in Tissue Organization

The cadherins are a superfamily of cell adhesion molecules comprising over 180 variants, with specific tissues expressing a particular combination of cadherin types. Cadherins generally exhibit homophilic binding; i.e., cadherins on one cell bind to cadherins of the same or closely related type on another cell. Thus, cells of the same type have a specific affinity to bind to each other and sort themselves into clusters to form tissues.
Cell Sorting During Development
Cell sorting plays an...
Cytoskeletal Coordination in Cell Migration01:32

Cytoskeletal Coordination in Cell Migration

A migrating cell changes its shape during the cyclic events of attachment and detachment from the substratum and repositions the cell organelles correspondingly. These complex events are orchestrated by the dynamic cytoskeletal network comprising actin filaments, intermediate filaments, and microtubules. Cytoskeletal crosstalk — the direct and indirect communication between the different components — is crucial for this coordination. Direct communication involves various linker proteins that...
Microtubules in Signaling01:22

Microtubules in Signaling

The primary cilium, made up of microtubules, acts as antennae on the cell surfaces for relaying external stimuli into the cells. These fine hair-like structures are present, generally one per cell. These are non-motile cilia in a 9+0 microtubules arrangement, where the central pair of microtubules are absent. The primary cilia arise from the basal body embedded in the cell membrane. Intraflagellar transport (IFT) carries requisite proteins from the cytoplasm to the cilium because the primary...

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Related Experiment Video

Updated: Jun 26, 2026

Pharmacological and Functional Genetic Assays to Manipulate Regeneration of the Planarian Dugesia japonica
09:58

Pharmacological and Functional Genetic Assays to Manipulate Regeneration of the Planarian Dugesia japonica

Published on: August 31, 2011

Beta-catenin and axis formation in planarians.

Hans Meinhardt1

  • 1Max-Planck-Institut für Entwicklungsbiologie, Spemannstr. 35, D72076 Tübingen, Germany. hans.meinhardt@tuebingen.mpg.de

Bioessays : News and Reviews in Molecular, Cellular and Developmental Biology
|January 21, 2009
PubMed
Summary

Beta-catenin is essential for planarian polarity and posterior development. Silencing this gene disrupts polarity, causing posterior tissues to form anterior structures like eyes during regeneration.

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Last Updated: Jun 26, 2026

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Area of Science:

  • Developmental Biology
  • Regenerative Biology
  • Planarian Biology

Background:

  • Beta-catenin plays a known role in establishing polarity and posterior characteristics in planarians.
  • Previous studies highlight the importance of beta-catenin in maintaining organismal organization.

Purpose of the Study:

  • To integrate recent findings on beta-catenin with existing knowledge.
  • To propose a model for understanding polarity and posterior development in planarians.

Main Methods:

  • RNA interference (RNAi) to silence beta-catenin gene transcription.
  • Analysis of polarity and characterization of blastema formation in regenerating planarian fragments.

Main Results:

  • Silencing beta-catenin leads to loss of overall polarity.
  • Regenerating posterior fragments exhibit anterior characteristics, including eyes and anterior ganglia.

Conclusions:

  • Beta-catenin is critical for both establishing and maintaining planarian polarity and posterior identity.
  • A comprehensive model is needed to incorporate these findings into broader understanding of regeneration.