Retrovirus integration and chromatin structure: Moloney murine leukemia proviral integration sites map near DNase I-hypersensitive sites

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.

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