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Chemical Dimerization-Induced Protein Condensates on Telomeres

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Published on: April 12, 2021

Mediator Condensates Localize Signaling Factors to Key Cell Identity Genes.

Alicia V Zamudio¹, Alessandra Dall'Agnese², Jonathan E Henninger²

¹Whitehead Institute for Biomedical Research, Cambridge, MA 02142, USA; Department of Biology, Massachusetts Institute of Technology, Cambridge, MA 02139, USA.

|September 30, 2019

Summary

Signaling factors use intrinsically disordered regions (IDRs) to enter and concentrate in cell identity-defining transcription factor condensates. This mechanism helps direct cell-type-specific responses to extracellular signals at super-enhancers.

Keywords:

JAK/STAT TGF-β WNT gene regulation signaling pathway transcriptional condensates

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Area of Science:

Molecular Biology
Cell Biology
Genetics

Background:

Cell identity is governed by gene expression programs.
Master transcription factors (TFs) bind enhancers to control these programs.
TF-Mediator condensates form at super-enhancers, integrating signaling inputs.

Purpose of the Study:

To investigate how signaling factors interact with Mediator condensates at super-enhancers.
To elucidate the role of intrinsically disordered regions (IDRs) in signaling factor function.
To understand the mechanism of cell-type-specific signaling responses.

Main Methods:

Investigated WNT, TGF-β, and JAK/STAT signaling pathways.
Analyzed the role of intrinsically disordered regions (IDRs) in signaling factor localization.
Examined the interaction of β-catenin with condensate components and DNA-binding factors.

Main Results:

Signaling factors utilize IDRs to enter and concentrate within Mediator condensates at super-enhancers.
The WNT coactivator β-catenin interacts with condensate components and DNA-binding factors.
β-catenin selectively occupies super-enhancer-associated genes.

Conclusions:

Signaling factors' IDRs mediate their partitioning into TF-Mediator condensates.
This partitioning contributes to cell-type-specific responses to signaling.
The mechanism links extracellular signals to cell identity genes via condensate dynamics.