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Published on: March 3, 2016
Stem Cell Differentiation Disperses Transcriptional Clusters via a Conserved Surface-Condensate Trajectory
Tim Klingberg1,2, Irina Wachter3, Agnieszka Pancholi4
1Department of Biology, Friedrich-Alexander-Universität Erlangen-Nürnberg, Erlangen, Germany.
Summary
Stem cell transcriptional clusters form via surface condensation on super-enhancers. These dynamic hubs disperse during differentiation through a conserved biophysical mechanism across species.
Area of Science:
- Molecular Biology
- Biophysics
- Developmental Biology
Background:
- Stem cells possess prominent transcriptional clusters crucial for embryonic gene regulation.
- The formation and dissolution of these clusters during differentiation are not well understood.
Purpose of the Study:
- To investigate the mechanism behind the formation and dispersal of transcriptional clusters in stem cells.
- To determine if this mechanism is conserved across different organisms.
Main Methods:
- Utilized live imaging and lattice simulations in mouse embryonic stem cells, fruit fly testes, and zebrafish embryos.
- Investigated the role of H3K27ac-marked super-enhancers as genomic scaffolds.
- Applied block copolymer-based lattice simulations to model the process.
Main Results:
- Observed that transcriptional clusters form via surface condensation on H3K27ac-marked super-enhancers.
- Demonstrated a conserved dispersal trajectory of these clusters during differentiation across species.
- Showed that differentiation involves loss of epigenetic marks and transcription-driven unfolding, leading to cluster dispersal.
Conclusions:
- Surface condensation is a conserved biophysical mechanism for organizing stem cell-specific transcriptional hubs.
- This process is evolutionarily conserved, highlighting the role of polymer properties in controlling cell identity and fate.
- Uncovered a novel mechanism for dynamic genome organization during development.
Keywords:
biomolecular condensatesenhancer transcription controlgene expressionnuclear organizationstem cell differentiationMore Related Videos
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