Related Experiment Video

Updated: Jun 2, 2026

Characterization of Cell Membrane Extensions and Studying Their Roles in Cancer Cell Adhesion Dynamics
08:11

Characterization of Cell Membrane Extensions and Studying Their Roles in Cancer Cell Adhesion Dynamics

Published on: March 26, 2018

Characterization of differential gene expression in adrenocortical tumors harboring beta-catenin (CTNNB1) mutations

Julien Durand1, Antoine Lampron, Tania L Mazzuco

  • 1Division of Endocrinology, Department of Medicine, Centre Hospitalier de l'Université de Montréal-Hôtel-Dieu, 3850 Saint Urbain Street, Montréal, Québec, Canada.

The Journal of Clinical Endocrinology and Metabolism
|May 14, 2011
PubMed
Abstract

Insights

Mutations in the β-catenin gene (CTNNB1) are common in adrenal tumors. This study identified key genes like RALBP1 and PDE2A that are deregulated in these tumors, offering insights into cancer development.

Area of Science:

  • Endocrinology
  • Molecular Biology
  • Oncology

Background:

  • Mutations in the β-catenin gene (CTNNB1) are frequently observed in both adrenocortical adenomas (AA) and adrenocortical carcinomas (ACC).
  • The specific target genes regulated by β-catenin in adrenocortical tumors remain largely unidentified.

Purpose of the Study:

  • To identify genes that exhibit altered expression in adrenocortical tumors with CTNNB1 mutations.
  • To investigate the impact of nuclear accumulation of β-catenin on gene expression profiles in these tumors.

Main Methods:

  • Microarray analysis was employed to identify differentially expressed genes between CTNNB1-mutated and wild-type (WT) adrenocortical adenomas.
  • Real-time PCR (RT-PCR) and Western blotting were used to validate gene and protein expression levels in a cohort of adrenal tissues and cell lines.
  • The functional impact of inhibiting Wnt-β-catenin signaling on gene expression was assessed using specific inhibitors.

Main Results:

  • Overexpression of ISM1, RALBP1, and PDE2A, and down-regulation of PHYHIP were confirmed in CTNNB1-mutated tumors compared to WT tumors and normal adrenal glands.
  • RALBP1 and PDE2A overexpression was further validated at the protein level.
  • ENC1 was found to be specifically overexpressed in tumors with CTNNB1 point mutations, and its expression decreased upon Wnt-β-catenin pathway inhibition.

Conclusions:

  • This research successfully identified candidate genes, including RALBP1, PDE2A, and ENC1, that are deregulated in CTNNB1-mutated adrenocortical tumors.
  • The findings contribute to a better understanding of the Wnt-β-catenin pathway's role in the development of adrenocortical tumors.
  • These identified genes represent potential targets for future research and therapeutic strategies.

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...
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...
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...
Tumor Progression02:07

Tumor Progression

Tumor progression is a phenomenon where the pre-formed tumor acquires successive mutations to become clinically more aggressive and malignant. In the 1950s, Foulds first described the stepwise progression of cancer cells through successive stages.
Colon cancer is one of the best-documented examples of tumor progression. Early mutation in the APC gene in colon cells causes a small growth on the colon wall called a polyp. With time, this polyp grows into a benign, pre-cancerous tumor. Further...
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...
Cancer-Critical Genes I: Proto-oncogenes01:33

Cancer-Critical Genes I: Proto-oncogenes

Genes usually encode proteins necessary for the proper functioning of a healthy cell. Mutations can often cause changes to the gene expression pattern, thereby altering the phenotype.
When the function of certain critical genes, especially those involved in cell cycle regulation and cell growth signaling cascades, gets disrupted, it upsets the cell cycle progression. Such cells with unchecked cell cycles start proliferating uncontrollably and eventually develop into tumors.
Such genes that act...