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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.
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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...
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...
Canonical Wnt Signaling Pathway02:54

Canonical Wnt Signaling Pathway

The gene encoding the main signaling molecules of the Wnt signaling pathways (the Wnt proteins) was discovered almost four decades ago by Nüsslein-Volhard and Wieschaus. They identified and originally named the gene "wingless" (wg) after a phenotype discovered during their landmark genetic screen in Drosophila for body pattern defects. At around the same time, another researcher named Harold Varmus found that a murine tumor virus activates the mammalian wg homolog, Int-1, which results in tumor...
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...
Cell Specific Gene Expression01:58

Cell Specific Gene Expression

Multicellular organisms contain a variety of structurally and functionally distinct cell types, but the DNA in all the cells originated from the same parent cells. The differences in the cells can be attributed to the differential gene expression. Liver cells, whose functions include detoxification of blood, production of bile to metabolize fats, and synthesis of proteins essential for metabolism, must express a specific set of genes to perform their functions. Gene expression also varies with...
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Cis-regulatory Sequences

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Related Experiment Video

Updated: Jul 12, 2026

Reconstitution Of &#946;-catenin Degradation In Xenopus Egg Extract
09:41

Reconstitution Of β-catenin Degradation In Xenopus Egg Extract

Published on: June 17, 2014

PITX2 and beta-catenin interactions regulate Lef-1 isoform expression.

Melanie Amen1, Xiaoming Liu, Usha Vadlamudi

  • 1Texas A&M Health Science Center, Institute of Biosciences and Technology, 2121 W. Holcombe Boulevard, Houston, TX 77030, USA.

Molecular and Cellular Biology
|September 6, 2007
PubMed
Summary

PITX2 and Lef-1 proteins interact with beta-catenin within the Wnt signaling pathway. This interaction regulates Lef-1 isoforms, impacting cell proliferation and migration.

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Last Updated: Jul 12, 2026

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Published on: June 17, 2014

The Soft Agar Colony Formation Assay
08:01

The Soft Agar Colony Formation Assay

Published on: October 27, 2014

Area of Science:

  • Molecular Biology
  • Developmental Biology
  • Genetics

Background:

  • Lef-1 and PITX2 are key transcription factors in the Wnt signaling pathway.
  • They interact with beta-catenin to regulate gene expression.
  • Understanding their precise interactions is crucial for developmental processes.

Purpose of the Study:

  • To elucidate the novel interactions between PITX2, Lef-1, and beta-catenin.
  • To investigate how PITX2 isoforms regulate Lef-1 expression and function.
  • To determine the role of these interactions in cell proliferation and migration.

Main Methods:

  • Chromatin immunoprecipitation (ChIP) assays to identify promoter targets.
  • Analysis of transgenic mice expressing LacZ under the Lef-1 promoter.
  • Studies on the interaction domains between PITX2, Lef-1, and beta-catenin.

Main Results:

  • The Lef-1 promoter was identified as a PITX2 downstream target.
  • PITX2 isoforms differentially regulate the LEF-1 promoter, affecting Lef-1 FL expression.
  • Novel interaction sites were identified between PITX2, Lef-1, and beta-catenin, with simultaneous binding to PITX2.

Conclusions:

  • PITX2, Lef-1, and beta-catenin form a complex regulating gene transcription.
  • Differential regulation of Lef-1 isoforms by PITX2 influences cell proliferation, migration, and division.
  • This study reveals a new mechanism of Wnt pathway regulation.