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DNA dose and sequence dependence in sperm-mediated gene transfer
I Sciamanna1, S Piccoli, L Barberi
1CNR Institute of Biomedical Technology, Rome, Italy.
Molecular Reproduction and Development
|May 29, 2000
Summary
Sperm-mediated gene transfer is more efficient using ejaculated sperm. Retrotransposon DNA, while increasing genetic transformation yield, can cause embryo lethality in mice and pigs, depending on the dose.
Area of Science:
- Reproductive Biology
- Molecular Biology
- Genetics
Background:
- Sperm-mediated gene transfer (SMGT) is a promising technique for genetic modification in various species.
- Understanding factors influencing SMGT efficiency and safety is crucial for its application in assisted reproduction and biotechnology.
Purpose of the Study:
- To investigate the impact of sperm origin (epididymal vs. ejaculated), DNA construct structure, and DNA dose on SMGT efficiency and safety in mice and pigs.
- To compare the efficacy of retrotransposon-based constructs versus viral constructs in SMGT.
Main Methods:
- Sperm-mediated gene transfer assays were performed using mouse and pig models.
- Three parameters were systematically varied: sperm origin, DNA construct (pVLCNhGH retrotransposon vs. viral constructs), and DNA concentration.
- Embryo development and genetic transformation rates in born animals were assessed.
Main Results:
- Ejaculated spermatozoa yielded higher SMGT efficiency compared to epididymal spermatozoa, potentially due to reduced apoptosis.
- The retrotransposon construct (pVLCNhGH) increased genetic transformation yield but caused significant embryo lethality at high doses.
- Embryonic developmental arrest was a DNA dose-dependent effect, with lower DNA concentrations being compatible with development.
Conclusions:
- Sperm origin and DNA characteristics significantly influence SMGT outcomes.
- Optimizing DNA dose and selecting appropriate constructs are critical for successful and safe SMGT.
- Ejaculated sperm are preferable for SMGT, and retrotransposon constructs offer potential for increased transformation efficiency when used cautiously.