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Analysis of Replicative Polymerase Usage by Ribonucleotide Incorporation
Andrea Keszthelyi1, Izumi Miyabe1, Katie Ptasińska1
1University of Sussex, John Maynard Smith Building, Falmer, Brighton, UK.
Methods in Molecular Biology (Clifton, N.J.)
|October 19, 2017
Summary
Researchers developed a novel method using mutant DNA polymerases to track which DNA strands are replicated. This technique maps DNA polymerase usage, origin efficiency, and replication timing across the genome.
Area of Science:
- Molecular Biology
- Genetics
- Biochemistry
Background:
- Mapping DNA polymerase usage is crucial for understanding DNA replication but has been technically challenging.
- Previous methods lacked the precision to differentiate replication contributions of specific polymerases to individual DNA strands.
Purpose of the Study:
- To develop and validate a method for precisely mapping the usage of replicative DNA polymerases.
- To identify the proportion of Watson and Crick DNA strands replicated by specific DNA polymerases within individual cells.
Main Methods:
- Utilizing mutant DNA polymerases engineered for high ribonucleotide incorporation efficiency.
- Employing Southern blot analysis for locus-specific polymerase usage.
- Applying next-generation sequencing for genome-wide analysis of polymerase activity.
Main Results:
- The mutant polymerases effectively mark replicated DNA strands with ribonucleotides, enabling strand-specific polymerase usage identification.
- Southern blot and next-generation sequencing analyses successfully mapped DNA polymerase activity.
- Genome-wide data provided direct measurements of replication origin efficiency.
Conclusions:
- This ribonucleotide incorporation method offers a robust approach to map DNA polymerase usage genome-wide.
- The technique facilitates the study of DNA replication dynamics, origin efficiency, and replication timing.