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Published on: September 24, 2015
In situ visualization of damaged DNA in human sperm by Raman microspectroscopy
C Mallidis1, J Wistuba, B Bleisteiner
1Centre for Reproductive Medicine and Andrology, University of Münster, Domagkstrasse 11, 48149 Münster, Germany. con.mallidis@ukmuenster.de
Human Reproduction (Oxford, England)
|May 3, 2011
Summary
Raman microspectroscopy offers a non-invasive method to assess sperm DNA damage, identifying specific molecular changes indicative of damage without rendering the sample unusable for future selection.
Area of Science:
- Biomedical Engineering
- Spectroscopy
- Reproductive Biology
Background:
- Current sperm DNA assessment methods are invasive and limit clinical utility.
- Raman microspectroscopy is a non-invasive laser technique providing cellular chemical fingerprints.
- This technique shows potential for nuclear DNA-based sperm selection.
Purpose of the Study:
- To evaluate Raman microspectroscopy for assessing sperm DNA integrity.
- To determine if Raman microspectroscopy can identify sites of DNA damage.
- To assess the reproducibility of this technique in sperm samples.
Main Methods:
- Eight healthy donors provided ejaculates for analysis.
- Sperm samples were analyzed before and after UVB irradiation.
- Spectra were analyzed using Principal Component, Spectral Angle, and Wavelet Analyses.
Main Results:
- Raman spectra provided a chemical map of sperm heads.
- Principal Component Analysis distinguished between damaged and undamaged sperm.
- Specific spectral regions (1042 cm(-1) and 1400-1600 cm(-1)) indicated DNA damage and protein-DNA interactions.
Conclusions:
- Raman microspectroscopy accurately assesses sperm DNA structure.
- The technique precisely identifies the location and extent of DNA damage.
- Measurements were reproducible between observers.
