Mapping of DNase I-hypersensitive sites in the 5' and 3' long terminal repeats of integrated moloney murine leukemia virus proviral DNA.
AUTOR(ES)
Thompson, T
RESUMO
The chromatin state of integrated Moloney murine leukemia virus (M-MuLV) proviral DNA was investigated. Nuclei from M-MuLV-infected mouse NIH 3T3 cells were digested with limited amounts of DNase I, and hypersensitive (HS) sites were mapped by the indirect end labeling technique. Particular emphasis was placed on the 5' long terminal repeat (LTR), since viral transcription initiates there. M-MuLV proviral DNA showed two strong DNase I-HS sites in the 5' LTR, one coincident with the transcription initiation (cap) site and the other with the transcriptional enhancers. Two weaker DNase I-HS sites were also detected in internal proviral DNA. The 3' LTR also showed a strong HS site in the region of the enhancers, but an HS site at the cap site of the 3' LTR was not detected. Thus, the chromatin configurations of the 5' and 3' LTRs of integrated M-MuLV proviruses appear to be different. The chromatin configuration of M-MuLV proviruses which contain LTR insertions of polyomavirus enhancer sequences was also studied. The 5' LTR of M-MuLV proviruses containing polyoma enhancer sequences substituted for the M-MuLV enhancers showed two strong HS sites, one in the polyoma sequences and one at the cap site. The 5' LTR of M-MuLV proviruses containing polyoma enhancer sequences inserted into the wild-type M-MuLV LTR between the cap site and the M-MuLV enhancers showed three HS sites. Two HS sites corresponded to those of the wild-type M-MuLV LTR, whereas the third mapped to the inserted polyoma sequences. The HS site associated with the inserted polyoma sequences was considerably stronger than the M-MuLV-associated HS sites.
ACESSO AO ARTIGO
http://www.pubmedcentral.nih.gov/articlerender.fcgi?artid=366760Documentos Relacionados
- Significance of DNase I-hypersensitive sites in the long terminal repeats of a Moloney murine leukemia virus vector.
- Retrovirus integration and chromatin structure: Moloney murine leukemia proviral integration sites map near DNase I-hypersensitive sites.
- DNase I-hypersensitive sites are associated with both long terminal repeats and with the intragenic enhancer of integrated human immunodeficiency virus type 1.
- Native genomic blotting: high-resolution mapping of DNase I-hypersensitive sites and protein-DNA interactions.
- High-resolution mapping of S1- and DNase I-hypersensitive sites in chromatin.