Protocol to isolate cells in four stages of S phase for high-resolution replication-timing sequencing

Area of Science:

• Molecular Biology
• Genetics
• Cell Biology

Background:

• Traditional replication timing (RT) experiments simplify S phase into early and late stages.
• Emerging evidence highlights dynamic RT variations within S phase, influencing RT patterns and regulation.
• A more precise understanding of S phase progression is needed.

Purpose of the Study:

• To present a novel protocol for assessing genome-wide replication timing with higher resolution.
• To enable the collection of DNA from four distinct phases within S phase.
• To facilitate a deeper investigation into the dynamics of DNA replication.

Main Methods:

• Development of a refined replication timing (RT) protocol using RPE-1 cells.
• Incorporation of a commercial kit for methyl-DNA library preparation.
• Utilizing BrdU-labeled DNA for sequencing and genome-wide RT assessment.

Main Results:

• The protocol allows for the collection of DNA from four distinct S phase intervals.
• Genome-wide replication timing can be assessed with enhanced precision.
• The method leverages methyl-DNA capture for efficient library preparation.

Conclusions:

• This protocol provides a more detailed view of replication timing dynamics within S phase.
• It offers a valuable tool for studying genome-wide replication patterns and regulatory mechanisms.
• The refined method advances the field of DNA replication timing research.