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Retrovirus integration and chromatin structure: Moloney murine leukemia proviral integration sites map near DNase
Abstract:
The chromatin conformation of mouse genome regions containing Moloney murine leukemia proviral intergration sites in two Mov mouse strains and randomly selected integration sites in virus-infected mouse 3T3 fibroblasts was analyzed. All integrations have occurred into chromosomal regions containing several DNase-hypersensitive sites, and invariably the proviral integration sites map within a few hundred base pairs of a DNase-hypersensitive site. The probability that this close association between proviral integration sites and DNase-hypersensitive sites was due to chance was calculated to be extremely low (2 X 10(-4]. Because the proviral integrations analyzed were not selected for an altered phenotype, our results suggest that DNase-hypersensitive regions are preferred targets for retrovirus integration.
Insights
Moloney murine leukemia virus integrations prefer specific DNA regions. These retrovirus integration sites are consistently found near DNase-hypersensitive sites in the mouse genome.
Area of Science:
- Genomics
- Molecular Biology
- Virology
Background:
- Retrovirus integration into the host genome is a critical step in viral replication.
- Understanding the factors that influence retroviral integration site selection is important for both viral pathogenesis and gene therapy applications.
Purpose of the Study:
- To investigate the relationship between retroviral integration sites and chromatin structure in mouse cells.
- To determine if specific genomic regions are preferentially targeted by Moloney murine leukemia virus.
Main Methods:
- Analysis of proviral integration sites in two Mov mouse strains.
- Analysis of randomly selected integration sites in virus-infected mouse 3T3 fibroblasts.
- Chromatin conformation analysis using DNase-hypersensitive site mapping.
Main Results:
- All Moloney murine leukemia virus integration sites were located within chromosomal regions containing DNase-hypersensitive sites.
- Proviral integration sites invariably mapped within a few hundred base pairs of a DNase-hypersensitive site.
- The probability of this association occurring by chance was extremely low (2 x 10^-4).
Conclusions:
- DNase-hypersensitive regions are preferred targets for Moloney murine leukemia virus integration.
- Chromatin accessibility, indicated by DNase-hypersensitive sites, likely plays a significant role in retroviral integration site selection.
- These findings suggest a mechanism for non-random retroviral integration independent of host cell phenotype.