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Isolation of human sequences that replicate autonomously in human cells
P J Krysan1, S B Haase, M P Calos
1Department of Genetics, Stanford University School of Medicine, California 94305.
Molecular and Cellular Biology
|March 1, 1989
Summary
Researchers identified human DNA sequences that replicate independently in human cells. These sequences, isolated using a novel Epstein-Barr virus vector strategy, may represent authentic human origins of replication.
Area of Science:
- Molecular Biology
- Genetics
- Virology
Background:
- Autonomous replication of DNA in human cells is crucial for genetic stability and manipulation.
- Epstein-Barr virus (EBV) vectors can facilitate the nuclear retention of DNA fragments.
- Identifying functional human origins of replication is key to understanding genome maintenance.
Purpose of the Study:
- To isolate and characterize human genomic sequences capable of autonomous replication in human cells.
- To investigate the role of viral elements in DNA replication and nuclear retention.
- To determine if isolated human sequences represent functional origins of replication.
Main Methods:
- Cloning random human DNA fragments into a defective Epstein-Barr virus vector.
- Utilizing long-term (2+ months) and short-term (4-day) replication assays.
- Analyzing plasmid DNA persistence (MboI-sensitive) and replication (DpnI-resistant) as indicators of autonomous replication.
Main Results:
- A heterogeneous collection of human genomic sequences capable of autonomous replication was isolated.
- Replication of human sequences was confirmed in the absence of viral components in short-term assays.
- Evidence suggests these human sequences function as authentic origins of replication.
Conclusions:
- Novel human DNA sequences with autonomous replication capabilities have been identified.
- These sequences are responsible for replication activity, independent of viral factors.
- The findings suggest the discovery of potential authentic human origins of replication.