Human DNA Replication Origins and Their Location
Author Information
Author(s): Valenzuela Manuel S., Chen Yidong, Davis Sean, Yang Fan, Walker Robert L., Bilke Sven, Lueders John, Martin Melvenia M., Aladjem Mirit I., Massion Pierre P., Meltzer Paul S.
Primary Institution: National Cancer Institute, National Institutes of Health
Hypothesis
The study investigates the distribution of origins of DNA replication in human chromosomes and their relationship with gene expression.
Conclusion
The study concludes that origins of DNA replication are preferentially located at the 5′ ends of expressed genes and at evolutionarily conserved DNA sequences.
Supporting Evidence
- Origins of DNA replication are enriched at the 5′ ends of expressed genes.
- The distribution of origins is largely conserved across different cell lines.
- A significant correlation exists between the positioning of origins and the location of H3K4Me3 and Pol-II binding sites.
Takeaway
This study found that the starting points for copying DNA in human cells are often found near active genes and important DNA sequences that have been preserved through evolution.
Methodology
The study used DNA microarray-based nascent strand abundance assays and high-throughput DNA sequencing to determine the distribution of putative origins of DNA replication.
Limitations
The study's findings reflect average profiles of origin activation in a population of cells and may not represent individual cell behavior.
Participant Demographics
Breast cancer cell lines MCF-7, BT-474, and lung cancer cell line H520 were used.
Statistical Information
P-Value
p<10−41
Statistical Significance
p<10−41
Digital Object Identifier (DOI)
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