Fragmentation dynamics of frozen-thawed ram sperm DNA is modulated by sperm concentration.
Summary of "Fragmentation dynamics of frozen-thawed ram sperm DNA is modulated by sperm concentration."
This study investigated the hypothesis that post-thaw incubation of ram sperm at high concentrations results in a faster rate of DNA fragmentation than when sperm are incubated at a lower concentration. Ejaculates from 10 rams were frozen-thawed, prepared in sperm concentrations of 100, 50, 25, 12, and 6 x 10(6) sperm/mL, and incubated for 6 h at 37 degrees C. Sperm DNA fragmentation was assessed using the sperm chromatin dispersion test (Sperm-Halomax(R)) at 1, 3, 4, and 6 h of incubation at 37 degrees C. On fitting a binary logistic regression with a cubic over time and treating ram and dilution levels as factors, there were significant effects with respect to the ram, dilution and time (all P-values were very much smaller than 0.001). Therefore, DNA fragmentation dynamics of incubated frozen-thawed ram sperm were not only dependent on the inherent sperm DNA fragmentation expressed immediately after thawing, but also on the concentration of sperm incubated in the sample. Although there was evidence of individual ram variation in SDF during the incubation period, the general finding of the current study was that lower sperm concentrations resulted in a slower rate of DNA fragmentation These findings have important implications for the post-thaw manipulation of ram sperm used for AI and advanced reproductive procedures that use sperm at low concentrations. Our data also emphasised the highly dynamic nature of sperm DNA fragmentation and the importance of conducting the procedure in a standardised manner.
Departamento de Biología, Unidad de Genética, Universidad Autónoma de Madrid (UAM). 20849-Madrid. España.
This article was published in the following journal.
- PubMed Source: http://www.ncbi.nlm.nih.gov/pubmed/20688370
- DOI: http://dx.doi.org/10.1016/j.theriogenology.2010.06.006
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Medical and Biotech [MESH] Definitions
The quality of SEMEN, an indicator of male fertility, can be determined by semen volume, pH, sperm concentration (SPERM COUNT), total sperm number, sperm viability, sperm vigor (SPERM MOTILITY), normal sperm morphology, ACROSOME integrity, and the concentration of WHITE BLOOD CELLS.
An assisted fertilization technique consisting of the microinjection of a single viable sperm into an extracted ovum. It is used principally to overcome low sperm count, low sperm motility, inability of sperm to penetrate the egg, or other conditions related to male infertility (INFERTILITY, MALE).
Interactive processes between the oocyte (OVUM) and the sperm (SPERMATOZOA) including sperm adhesion, ACROSOME REACTION, sperm penetration of the ZONA PELLUCIDA, and events leading to FERTILIZATION.
The structural and functional changes by which SPERMATOZOA become capable of oocyte FERTILIZATION. It normally requires exposing the sperm to the female genital tract for a period of time to bring about increased SPERM MOTILITY and the ACROSOME REACTION before fertilization in the FALLOPIAN TUBES can take place.
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