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Related Experiment Video

Updated: Sep 5, 2025

Coulomb Explosion Imaging as a Tool to Distinguish Between Stereoisomers

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A shattering experience.

James E Haber¹

¹Rosenstiel Center and Department of Biology, Brandeis University, Waltham, MA 02154, USA.

|July 8, 2022

Summary

This summary is machine-generated.

DNA breaks causing chromothripsis are generated by the base excision repair APE1 endonuclease. This enzyme is triggered by removing deoxyinosines from DNA::RNA hybrids, leading to chromosome pulverization and rearrangement.

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Area of Science:

Molecular Biology
Genetics
Genomics

Background:

Chromothripsis is a complex genomic rearrangement characterized by chromosome pulverization and chaotic reassembly.
The precise mechanisms initiating chromothripsis remain incompletely understood.
DNA repair pathways are critical for maintaining genomic integrity.

Purpose of the Study:

To investigate the role of the base excision repair pathway in generating DNA breaks that lead to chromothripsis.
To identify the specific endonuclease involved in initiating chromothripsis-associated DNA damage.
To elucidate the molecular triggers for chromothripsis induction.

Main Methods:

Analysis of DNA repair pathways in the context of chromosomal instability.
Biochemical assays to assess endonuclease activity on DNA substrates.
Investigating the formation and resolution of DNA::RNA hybrids.

Main Results:

The base excision repair APE1 endonuclease is responsible for generating the DNA breaks that trigger chromothripsis.
Deoxyinosines, arising from DNA::RNA hybrids, act as the specific trigger for APE1 endonuclease activation in this context.
APE1 endonuclease activity on deoxyinosines in RNA:DNA hybrids leads to DNA fragmentation and subsequent chromothripsis.

Conclusions:

The base excision repair pathway, specifically the APE1 endonuclease, plays a direct role in the generation of chromothripsis.
DNA::RNA hybrids and the resulting deoxyinosine lesions are key initiating events for chromothripsis.
Targeting APE1 endonuclease or mitigating DNA::RNA hybrid formation could offer strategies to prevent chromothripsis.