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Integration of foreign DNA sequences into mouse sperm genome
1Institute of Biomedical Technology, CNR, Rome, Italy.
DNA and Cell Biology
|March 1, 1997
Summary
Mouse sperm can internalize foreign DNA, which then integrates into the sperm genome. This integration appears non-random, potentially involving topoisomerase II, suggesting targeted DNA recombination in sperm.
Area of Science:
- Sperm biology
- Molecular biology
- Genetics
Background:
- Mouse epididymal sperm cells exhibit spontaneous uptake of exogenous DNA.
- A portion of sperm-bound DNA is internalized into the sperm nucleus.
Purpose of the Study:
- To investigate the fate of internalized foreign DNA within sperm nuclei.
- To determine if and how exogenous DNA integrates into the sperm genome.
Main Methods:
- Sperm cells were challenged with plasmid DNA (pSV2CAT).
- Internalized DNA fate was tracked within sperm nuclei.
- Plasmid rescue and sequence analysis were performed on recovered clones.
Main Results:
- Internalized plasmid DNA associates with the nuclear scaffold, undergoes rearrangement, and recombines with sperm genomic DNA.
- DNA fragments from the plasmid were integrated into the mouse sperm genome.
- Integration sites were identical in independently recovered clones, indicating non-random integration.
Conclusions:
- Exogenous DNA integration into the mouse sperm genome occurs at preferential sites.
- A topoisomerase II consensus sequence near the integration site suggests its potential role in nonhomologous recombination.