Related Experiment Video

Updated: Jul 28, 2026

Prediction and Validation of Gene Regulatory Elements Activated During Retinoic Acid Induced Embryonic Stem Cell Differentiation
09:07

Prediction and Validation of Gene Regulatory Elements Activated During Retinoic Acid Induced Embryonic Stem Cell Differentiation

Published on: June 21, 2016

Cell-type and promoter-context dependent retinoic acid receptor (RAR) redundancies for RAR beta 2 and Hoxa-1

R Taneja1, B Roy, J L Plassat

  • 1Institut de Genetique et de Biologie Moleculaire et Cellulaire, Centre National de la Recherche Scientifique, Institut National de la Santé et de la Recherche Médicale, Université Louis Pasteur, France.

Proceedings of the National Academy of Sciences of the United States of America
|June 11, 1996
PubMed

Insights

Retinoic acid receptors (RARs) show functional redundancy in gene activation and cell differentiation, but specific receptor types mediate distinct cellular responses. This highlights cell-specific overrides and potential artifacts in gene disruption studies.

Area of Science:

  • Molecular Biology
  • Cell Biology
  • Developmental Biology

Background:

  • Retinoic acid receptors (RARs) and Retinoic X receptors (RXRs) are crucial nuclear receptors regulating gene expression and cellular processes.
  • Understanding the specific roles of different RAR subtypes (alpha, beta, gamma) in mediating retinoic acid's effects is essential for deciphering developmental pathways.

Purpose of the Study:

  • To investigate the distinct contributions of RAR subtypes (alpha, beta, gamma) and RXRs in activating retinoic acid target genes.
  • To elucidate the roles of RARs and RXRs in the differentiation of embryonal carcinoma cells (e.g., F9 and P19 cells).

Main Methods:

  • Utilized RAR subtype-specific synthetic retinoids and a pan-RXR ligand.
  • Examined gene induction (RARbeta2, Hoxa-1) and cell differentiation in wild-type and RAR knockout (RARgamma-/-, RARalpha-/-) F9 cells, as well as P19 cells.

Main Results:

  • Demonstrated cell-type and promoter context-dependent functional redundancies among RAR subtypes for gene induction.
  • Showed that RXR activation synergistically modulates RAR redundancy.
  • Identified auto-induction of RARbeta2 in RARgamma-/- F9 cells, suggesting potential artifacts in gene disruption studies.
  • Revealed cell-specific overrides where one RAR subtype can dominate over others.
  • Found that RARgamma is essential for wild-type F9 cell differentiation, while RARalpha or RARgamma can mediate P19 cell differentiation.

Conclusions:

  • While RARs exhibit functional redundancy, their specific roles in gene activation and cell differentiation are context-dependent and cell-specific.
  • The findings underscore the complexity of RAR signaling, with potential for artifacts in studies relying solely on gene knockouts.
  • Specific RAR subtypes play critical, non-interchangeable roles in mediating retinoic acid's developmental effects in different cell types.

More Related Videos

Quantitative Measurement of Relative Retinoic Acid Levels in E8.5 Embryos and Neurosphere Cultures Using the F9 RARE-Lacz Cell-based Reporter Assay09:49

Quantitative Measurement of Relative Retinoic Acid Levels in E8.5 Embryos and Neurosphere Cultures Using the F9 RARE-Lacz Cell-based Reporter Assay

Published on: September 6, 2016

Multiplexed Analysis of Retinal Gene Expression and Chromatin Accessibility Using scRNA-Seq and scATAC-Seq06:24

Multiplexed Analysis of Retinal Gene Expression and Chromatin Accessibility Using scRNA-Seq and scATAC-Seq

Published on: March 12, 2021

Related Concept Videos

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...
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...
Co-activators and Co-repressors02:04

Co-activators and Co-repressors

Gene transcription is regulated by the synergistic action of several proteins that form a complex at a gene regulatory site. This is observed in eukaryotes, where the regulation of gene expression is a complex process. Regulatory proteins in eukaryotes can broadly be classified into two types – regulators that bind directly to specific DNA sequences and co-regulators that associate with regulatory proteins but cannot directly bind to the DNA. These co-regulators are further divided into...
Exon Recombination02:32

Exon Recombination

The evolution of new genes is critical for speciation. Exon recombination, also known as exon shuffling or domain shuffling, is an important means of new gene formation. It is observed across vertebrates, invertebrates, and in some plants such as potatoes and sunflowers. During exon recombination, exons from the same or different genes recombine and produce new exon-intron combinations, which might evolve into new genes. 
Exon shuffling follows “splice frame rules.” Each exon has three reading...
The Retinoblastoma Gene01:20

The Retinoblastoma Gene

Tumor suppressor genes are normal genes that can slow down cell division, repair DNA mistakes, or program the cells for apoptosis in case of irreparable damage. Hence, they play an essential role in preventing the proliferation of damaged cells.
The first-ever tumor suppressor gene called Rb was identified in retinoblastoma - a rare eye tumor in children. In inherited forms of the disease, a child inherits one defective copy of the Rb gene, which predisposes them to retinoblastoma. However,...
General Transcription Factors01:30

General Transcription Factors

Tissue-specific transcription factors contribute to diverse cellular functions in mammals. For example, the gene for beta globin, a major component of hemoglobin, is present in all cells of the body. However, it is only expressed in red blood cells because the transcription factors that can bind to the promoter sequences of the beta globin gene are only expressed in these cells. Tissue-specific transcription factors also ensure that mutations in these factors may impair only the function of...