Related Experiment Video
Updated: Sep 8, 2025
16:42
Generation of RNA/DNA Hybrids in Genomic DNA by Transformation using RNA-containing Oligonucleotides
Published on: November 24, 2010
27.0K
In Vitro Binding of GADD45A to RNA:DNA Hybrids
Khelifa Arab1, Christof Niehrs2,3
1Institute of Molecular Biology (IMB), Mainz, Germany. k.arab@imb-mainz.de.
Methods in Molecular Biology (Clifton, N.J.)
|June 15, 2022
Summary
Growth Arrest and DNA Damage 45A (GADD45A) binds directly to RNA:DNA hybrids, known as R-loops. This interaction is crucial for GADD45A
Area of Science:
- Molecular Biology
- Epigenetics
- Genomics
Background:
- R-loops are three-stranded RNA:DNA hybrid structures formed during transcription.
- While R-loop misregulation is linked to genome instability, regulatory R-loops control gene expression.
- Growth Arrest and DNA Damage 45A (GADD45A) is an R-loop reader involved in epigenetic gene regulation.
Purpose of the Study:
- To investigate the direct binding of GADD45A to RNA:DNA hybrids (R-loops).
- To establish biochemical methods for studying GADD45A-R-loop interactions.
- To understand the role of R-loops as adapters for GADD45A recruitment to specific genomic loci.
Main Methods:
- Development of protocols for in vitro binding assays.
- GADD45A pulldown assays to assess binding to R-loops.
- Electrophoretic Mobility Shift Assays (EMSA) to study GADD45A-R-loop complex formation.
Main Results:
- Demonstrated the direct binding capability of GADD45A to RNA:DNA hybrids.
- Established robust biochemical assays for studying this interaction.
- Provided a foundation for understanding how GADD45A utilizes R-loops for epigenetic regulation.
Conclusions:
- GADD45A directly interacts with R-loops, which serve as adapters for its genomic localization.
- These R-loops facilitate GADD45A-mediated recruitment of demethylation machinery (TET dioxygenase, Thymine DNA glycosylase).
- This interaction contributes to conferring an open chromatin state at specific CpG island promoters.
