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Long non-coding RNAs direct the SWI/SNF complex to cell type-specific enhancers.
James A Oo1,2,3, Timothy Warwick1,2,3, Katalin Pálfi1
1Goethe University Frankfurt, Institute for Cardiovascular Physiology, Frankfurt, Germany.
Nature Communications
|January 2, 2025
Summary
Long non-coding RNAs (lncRNAs) guide the SWItch/Sucrose Non-Fermentable (SWI/SNF) complex to specific enhancers. This lncRNA-SWI/SNF interaction controls chromatin accessibility and gene expression, revealing a new regulatory mechanism.
Area of Science:
- Molecular Biology
- Genomics
- Epigenetics
Background:
- Chromatin remodeling is crucial for DNA accessibility and gene expression.
- The SWItch/Sucrose Non-Fermentable (SWI/SNF) complex is vital for context-dependent gene regulation.
- Mechanisms guiding SWI/SNF to specific genomic locations remain unclear.
Purpose of the Study:
- To elucidate the mechanisms directing SWI/SNF to specific genomic targets.
- To investigate the role of long non-coding RNAs (lncRNAs) in SWI/SNF targeting.
- To understand how lncRNA-SWI/SNF interactions influence chromatin accessibility and gene expression.
Main Methods:
- Demonstration of trans-acting lncRNAs directing SWI/SNF to enhancers.
- Analysis of SWI/SNF binding preferences for lncRNAs.
- Assessment of lncRNA and SWI/SNF co-localization at enhancers.
- Knockdown experiments to observe effects on SWI/SNF distribution and gene expression.
Main Results:
- SWI/SNF preferentially binds lncRNAs, which then bind DNA targets in trans.
- lncRNAs and SWI/SNF co-localize at cell type-specific enhancers.
- Knockdown of lncRNAs causes SWI/SNF redistribution and differential gene expression.
- lncRNA-SWI/SNF-enhancer networks support an enhancer hub model.
Conclusions:
- lncRNAs competitively recruit SWI/SNF to specific enhancers.
- This provides a dynamic regulatory layer for chromatin accessibility.
- lncRNAs are key mediators of enhancer activity and gene expression through SWI/SNF recruitment.
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