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Related Concept Videos

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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...
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Epigenetics is the study of inherited changes in a cell's phenotype without changing the DNA sequences. It provides a form of memory for the differential gene expression pattern to maintain cell lineage, position-effect variegation, dosage compensation, and maintenance of chromatin structures such as telomeres and centromeres. For example, the structure and location of the centromere on chromosomes are epigenetically inherited. Its functionality is not dictated or ensured by the underlying...
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Related Experiment Video

Updated: Sep 12, 2025

Differentiation and Imaging of Brown Adipocytes from the Stromal Vascular Fraction of Interscapular Adipose Tissue from Newborn Mice
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IRX3 controls a SUMOylation-dependent differentiation switch in adipocyte precursor cells.

Jan-Inge Bjune1,2,3, Samantha Laber4, Laurence Lawrence-Archer1,3

  • 1Mohn Research Center for Diabetes Precision Medicine, Department of Clinical Science, University of Bergen, Bergen, Norway.

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|August 6, 2025
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Summary

IRX3 protein influences cell fate by altering epigenetic reprogramming and SUMOylation. This regulation is key for maintaining mesenchymal identity, promoting fat storage, and suppressing bone formation.

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Area of Science:

  • Molecular Biology
  • Epigenetics
  • Cell Biology

Background:

  • IRX3 (Iroquois homeobox 3) is associated with obesity risk via the FTO locus.
  • Elevated IRX3 expression during early adipogenesis shifts adipocyte fate towards fat storage.
  • The role of IRX3 in later developmental stages and epigenetic regulation is not well understood.

Purpose of the Study:

  • To investigate the role of IRX3 in modulating epigenetic reprogramming during adipocyte differentiation.
  • To identify downstream targets and mechanisms regulated by IRX3.
  • To understand how IRX3 influences cell fate decisions between adipogenesis and osteogenesis.

Main Methods:

  • ChIP-sequencing to identify IRX3 binding sites in preadipocytes.
  • IRX3 knockout (KO) mouse embryonic fibroblasts (MEFs) to assess gene expression changes.
  • Pharmacological inhibition of SUMOylation.
  • 3D cultures to evaluate cell fate switching.

Main Results:

  • IRX3 binds to promoters of SUMOylation and chromatin remodeling genes.
  • IRX3 KO alters SUMOylation pathway gene expression, increases global SUMOylation, and inhibits PPARγ activity, thereby blocking adipogenesis.
  • SUMOylation inhibition rescues adipogenesis defects caused by IRX3 KO.
  • IRX3 KO reduces SUMOylation at Wnt-related genes, activating Wnt signaling and promoting osteogenesis, which is partially reversible by SUMOylation inhibition.

Conclusions:

  • IRX3 acts as a crucial transcriptional regulator of epigenetic programs.
  • IRX3 functions upstream of SUMOylation to maintain mesenchymal identity, support adipogenesis, and suppress osteogenesis.
  • These findings reveal IRX3 as a key player in cell fate determination through epigenetic modulation.