Detection of DNA Breaks in Dividing Human Cells by Neutral Comet Assay
August 23rd, 2024
This protocol is designed to investigate the extent of DNA damage occurring during DNA replication. Under neutral conditions, the induction of DNA breaks can be readily assessed within a short time frame. Additionally, the protocol is adaptable to other cell types and various replication stress reagents.
The main objective of our lab is to study mechanisms that promote genome duplication in human cells. Our project focuses on understanding how chromatin remodelers act at replication forks to promote DNA synthesis. Forks undergo multiple processing events when exposed to replication stress.
These events give rise to replication intermediates that can convert to toxic breaks if left unrepaired. Recent studies demonstrate that the presence of single-strand DNA gaps in nascent DNA can cause genome instability and is a determinant of chemo sensitivity. Our work addresses the role of a conserved nucleosome remodeler, SNF2L, in DNA synthesis.
SNF2L travels with replication forks, but the mechanism of action is poorly characterized. Using the comet assay protocol allows us to assess consequences in fork stability when SNF2L is absent.
Overview
This protocol investigates DNA damage during replication, assessing DNA breaks under neutral conditions. It is adaptable to various cell types and replication stress reagents.
Key Study Components
Area of Science
- DNA replication
- Genome stability
- Chromatin remodeling
Background
- Understanding mechanisms of genome duplication in human cells.
- Role of chromatin remodelers at replication forks.
- Impact of replication stress on DNA integrity.
- Single-strand DNA gaps can lead to genome instability.
Purpose of Study
- To study the role of SNF2L in DNA synthesis.
- To assess the effects of replication stress on DNA breaks.
- To explore the relationship between DNA damage and chemo sensitivity.
Methods Used
- Assessment of DNA breaks under neutral conditions.
- Adaptation of protocols to various cell types.
- Use of replication stress reagents.
- Analysis of replication intermediates.
Main Results
- Identification of DNA damage during replication stress.
- Demonstration of the role of SNF2L in promoting DNA synthesis.
- Link between single-strand gaps and genome instability.
- Insights into the mechanisms of chemo sensitivity.
Conclusions
- The protocol effectively assesses DNA damage during replication.
- Findings highlight the importance of chromatin remodeling in DNA synthesis.
- Understanding DNA damage mechanisms can inform cancer treatment strategies.
