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Updated: Jul 18, 2026

Study of the DNA Damage Checkpoint using Xenopus Egg Extracts

Study of the DNA Damage Checkpoint using Xenopus Egg Extracts

Published on: November 5, 2012

Analyzing the ATR-mediated checkpoint using Xenopus egg extracts.

Patrick J Lupardus¹, Christopher Van, Karlene A Cimprich

¹Department of Molecular Pharmacology, Stanford University, 318 Campus Drive , Stanford, CA 94305-5441, USA.

Methods (San Diego, Calif.)

|December 27, 2006

Summary

Xenopus egg extracts provide a model for studying DNA replication and cell cycle checkpoints. New methods using these extracts, including nucleoplasmic extract (NPE), advance research on ATR-mediated DNA damage and replication checkpoints.

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Area of Science:

Cell Biology
Molecular Biology
Genetics

Background:

Xenopus egg extracts are established models for cell cycle research, including DNA replication and mitosis.
Recent research utilizes Xenopus extracts to study DNA damage and replication checkpoints, ensuring genome stability.
The ATR-mediated pathway is crucial for these checkpoints.

Purpose of the Study:

To describe novel Xenopus extract methods for studying ATR-mediated checkpoints.
To introduce the nucleoplasmic extract (NPE) system for nuclear events.
To present assays for checkpoint activation and methods for ATR activation using DNA structures.

Main Methods:

Preparation of Xenopus nucleoplasmic extract (NPE) for studying nuclear events.
Development of key assays to monitor checkpoint activation.

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Study of the DNA Damage Checkpoint using Xenopus Egg Extracts

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Reconstitution Of β-catenin Degradation In Xenopus Egg Extract

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Utilizing small DNA structures to specifically activate the ATR pathway.

Main Results:

The described methods facilitate the study of DNA replication and checkpoints in a soluble nuclear extract system.
Specific assays enable detailed investigation of checkpoint activation mechanisms.
Small DNA structures effectively activate ATR, allowing for focused mechanistic studies.

Conclusions:

Xenopus egg extract methods, particularly NPE, are valuable tools for dissecting ATR-mediated DNA damage and replication checkpoints.
These advancements contribute to understanding genome stability mechanisms.
The described protocols and assays offer new avenues for checkpoint research.