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In Vitro SUMOylation Assay to Study SUMO E3 Ligase Activity
Published on: January 29, 2018
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SUMOylation coordinates BERosome assembly in active DNA demethylation during cell differentiation
Roland Steinacher1, Zeinab Barekati2, Petar Botev3
1Department of Biomedicine, University of Basel, Basel, Switzerland roland.steinacher@unibas.ch primo.schaer@unibas.ch.
The EMBO Journal
|December 8, 2018
Summary
SUMOylation of XRCC1 and TDG orchestrates DNA demethylation repair. This process suppresses DNA breaks and is crucial for neural lineage commitment in differentiating cells.
Area of Science:
- Epigenetics and DNA repair mechanisms.
- Cellular response to DNA damage and genome stability.
Background:
- Active DNA demethylation involves TET oxidation of 5-methylcytosine (5mC) to 5-formyl-/5-carboxylcytosine (5fC/5caC).
- These oxidized bases are replaced by unmethylated cytosine via Thymine DNA Glycosylase (TDG)-initiated Base Excision Repair (BER).
- BER generates abasic sites, requiring coordination with downstream repair to prevent genomic instability.
Purpose of the Study:
- To investigate the role of SUMOylation and the BER protein XRCC1 in TDG-initiated BER.
- To elucidate the mechanism by which SUMOylation orchestrates the TDG-BER pathway.
- To determine the biological significance of TDG SUMOylation in cellular processes.
Main Methods:
- Analysis of 5fC/5caC generation in differentiating mouse embryonic stem cells (mESCs).
- Investigation of SUMOylation of XRCC1 and TDG.
- Assessment of TDG-BER core complex assembly and SUMO transfer.
- Evaluation of DNA strand-break accumulation and toxicity under PARP inhibition.
- Analysis of neural lineage commitment.
Main Results:
- 5fC/5caC is generated at a high rate in differentiating mESCs.
- SUMOylation of XRCC1 is critical for TDG interaction and TDG-BER core complex assembly.
- SUMO is transferred from XRCC1 to TDG, promoting TDG dissociation and BER completion.
- SUMOylation of TDG suppresses DNA strand-break accumulation and PARP inhibitor toxicity.
- TDG SUMOylation is essential for neural lineage commitment.
Conclusions:
- SUMOylation of XRCC1 and TDG is a key regulatory mechanism for TDG-initiated BER of oxidized methylcytosines.
- This SUMOylation-dependent process ensures efficient DNA repair, genome stability, and proper cellular differentiation.
- TDG SUMOylation plays a vital role in preventing DNA damage and is essential for neural development.
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