Viral and Cellular Factors in Retroviral DNA Integration
Author Information
Author(s): Lewinski Mary K, Yamashita Masahiro, Emerman Michael, Ciuffi Angela, Marshall Heather, Crawford Gregory, Collins Francis, Shinn Paul, Leipzig Jeremy, Hannenhalli Sridhar, Berry Charles C, Ecker Joseph R, Bushman Frederic D
Primary Institution: The Salk Institute
Hypothesis
What are the viral determinants of integration-site selection in retroviruses?
Conclusion
The study found that the integrase protein is the main determinant of integration specificity, with additional roles for Gag proteins.
Supporting Evidence
- HIV integrates preferentially within active transcription units.
- MLV integrates preferentially near transcription start sites and CpG islands.
- Chimeric viruses showed integration preferences similar to MLV when MLV integrase was present.
- Integration near DNase I-hypersensitive sites was favored by MLV and chimeric viruses with MLV integrase.
- Transcription-factor binding sites were enriched near integration sites of MLV and chimeric viruses.
Takeaway
Retroviruses like HIV and MLV prefer to insert their DNA into specific parts of our genes, and this study shows which viral proteins help them choose those spots.
Methodology
The study used chimeric viruses with segments of MLV substituted into HIV to analyze integration-site preferences through cloning and sequencing.
Potential Biases
Potential biases in integration-site recovery due to puromycin selection were controlled for by using control viruses.
Limitations
The study primarily focused on specific viral proteins and may not account for all cellular factors influencing integration.
Participant Demographics
Human cells (HeLa cells) were used for the experiments.
Statistical Information
P-Value
p<0.0001
Statistical Significance
p<0.0001
Digital Object Identifier (DOI)
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