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The gene expression in cells is regulated at different stages: (i) transcription, (ii) RNA processing, (iii) RNA localization, and (iv) translation. Transcriptional regulation is mediated by regulatory proteins such as transcription factors, activators, or repressors—these control gene expression by initiating or inhibiting the transcription of genes. Once a precursor or pre-mRNA is produced, it undergoes post-transcriptional modification, including 5' capping, splicing, and the...
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Related Experiment Video

Updated: Jul 6, 2025

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Multi-omics integration identifies cell-state-specific repression by PBRM1-PIAS1 cooperation.

Patric J Ho1, Junghun Kweon1, Laura A Blumensaadt1

  • 1Department of Molecular Biosciences, Northwestern University, Evanston, IL 60208, USA.

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|January 8, 2024
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Polycystic kidney and liver disease 1 (PBRM1) protein regulates epithelial cell differentiation. Its function changes based on cell state, impacting progenitor maintenance and differentiation via interactions with PIAS1.

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BAFPBRM1PIAS1SUMOSWI/SNFdifferentiationepidermisepithelialkeratinocytesprogenitorrepressionskin

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Area of Science:

  • Cell Biology
  • Molecular Biology
  • Cancer Research

Background:

  • The gene regulatory functions of PBRM1 in normal epithelial homeostasis before cancer initiation are not well understood.
  • PBRM1 is frequently mutated in epithelial cancers, suggesting a critical role in these tissues.

Purpose of the Study:

  • To investigate the cell-state-specific gene regulatory roles of PBRM1 in human skin epithelium.
  • To elucidate the molecular mechanisms underlying PBRM1's function in maintaining epithelial progenitor populations and regulating differentiation.

Main Methods:

  • Utilized human skin epithelium as a model system to study PBRM1.
  • Performed targeted screens to identify PBRM1 interacting proteins.
  • Investigated the role of SUMOylation in PBRM1 function.

Main Results:

  • PBRM1 exhibits distinct gene regulatory functions in progenitor versus differentiated epithelial cells.
  • In progenitors, PBRM1 represses differentiation; in differentiated cells, it acts as an activator.
  • PIAS1 was identified as a key interacting protein that co-localizes with PBRM1 to repress differentiation genes in progenitors.
  • PIAS1 chromatin binding decreases significantly during differentiation.
  • SUMOylation of PBRM1 contributes to its repressive role in progenitor maintenance.

Conclusions:

  • PBRM1's gene regulatory activity is cell-state-dependent, switching between repressor and activator roles.
  • The protein interactome, particularly PIAS1, influences PBRM1's function.
  • PBRM1's role in epithelial homeostasis is modulated by its interactions and post-translational modifications like SUMOylation, despite stable chromatin binding.