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Exogenous DNA uptake by bovine spermatozoa does not induce DNA fragmentation
W B Feitosa1, C M Mendes, M P Milazzotto
1Department of Animal Reproduction, College of Veterinary Medicine and Animal Science, University of Sao Paulo, Sao Paulo, Brazil.
Theriogenology
|June 12, 2010
Summary
Sperm-mediated gene transfer (SMGT) in cattle shows increased exogenous DNA uptake with higher DNA concentrations and longer incubation. Importantly, this method did not negatively impact sperm DNA integrity or induce apoptosis.
Area of Science:
- Reproductive Biology
- Molecular Biology
- Animal Biotechnology
Background:
- Sperm-mediated gene transfer (SMGT) offers a rapid and economical approach for generating transgenic animals.
- Optimizing SMGT protocols is crucial for efficient genetic modification in livestock.
Purpose of the Study:
- To investigate the impact of exogenous DNA concentration and incubation duration on DNA uptake by bovine spermatozoa.
- To assess the subsequent effects on sperm DNA integrity and apoptosis.
Main Methods:
- Bovine spermatozoa were incubated with varying concentrations of pEYFP-Nuc plasmid DNA (100, 300, 500 ng) for different durations (60, 120 min).
- Exogenous DNA uptake was quantified using real-time PCR.
- Sperm DNA fragmentation was evaluated via Sperm Chromatin Structure Assay (SCSA) and TUNEL assay, analyzed by flow cytometry.
Main Results:
- Significant increase in exogenous DNA uptake observed with longer incubation (120 min) at the highest DNA concentration (500 ng).
- No significant adverse effects on endogenous sperm DNA integrity or apoptosis were detected across tested conditions.
Conclusions:
- Optimized incubation parameters (higher DNA concentration and longer duration) enhance exogenous DNA uptake in bovine spermatozoa.
- SMGT shows potential as a safe method for genetic modification without compromising sperm DNA quality.
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