Related Experiment Videos
Localization of SV40 genes within supercoiled loop domains
Nucleic Acids Research
|December 11, 1980
Summary
Eukaryotic DNA forms supercoiled loops anchored to a nuclear matrix. Viral DNA sequences in infected cells were found enriched at these attachment points, suggesting functional organization.
Area of Science:
- Molecular Biology
- Cell Biology
- Genomics
Background:
- Eukaryotic DNA is organized into supercoiled loop domains.
- These DNA loops are anchored to an insoluble nuclear skeleton or matrix.
- Nuclease digestion releases most DNA, leaving matrix-associated DNA sequences.
Purpose of the Study:
- To investigate the association of DNA sequences with the nuclear matrix.
- To determine if specific DNA sequences are enriched at matrix-DNA attachment points.
Main Methods:
- Quantitative Southern blotting technique.
- Analysis of DNA from SV40 infected 3T3 cells.
- Comparison with control experiments using globin genes.
Main Results:
- Residual DNA associated with the nuclear matrix was enriched in SV40 sequences (3-7 fold).
- No enrichment of globin genes was observed in the residual matrix DNA.
- This indicates SV40 sequences are located near matrix-DNA attachment points.
Conclusions:
- Specific DNA sequences, like those from SV40, are preferentially associated with the nuclear matrix.
- This sequence specificity suggests a relationship between DNA spatial organization and cellular function.