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Updated: Nov 8, 2025

Flow Cytometric Analysis of Biomarkers for Detecting Human Sperm Functional Defects
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Label-Free Evaluation of Chromatin Condensation in Human Normal Morphology Sperm Using Raman Spectroscopy.

M Y Jahmani1, M E Hammadeh1, M A Al Smadi1

  • 1Department of Obstetrics and Gynecology, Assisted Reproductive Laboratory, Saarland University Hospital, Homburg, Germany.

Reproductive Sciences (Thousand Oaks, Calif.)
|April 20, 2021
PubMed
Summary
This summary is machine-generated.

Confocal Raman spectroscopy offers a non-invasive method to assess sperm chromatin condensation. This technique can detect sperm with chromatin abnormalities, aiding in assisted reproduction diagnostics.

Keywords:
Chromatin condensationChromomycin A3Raman spectroscopySperm

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Area of Science:

  • Biomedical Engineering
  • Spectroscopy
  • Reproductive Biology

Background:

  • Sperm chromatin condensation is crucial for male fertility.
  • Current methods for evaluating chromatin condensation are invasive and render sperm unusable for assisted reproduction.
  • Identifying non-invasive diagnostic tools is essential for improving fertility treatments.

Purpose of the Study:

  • To investigate the potential of confocal Raman spectroscopy as a non-invasive method for detecting sperm chromatin abnormalities.
  • To determine if Raman spectra can differentiate sperm with varying levels of chromatin condensation.
  • To correlate Raman spectral features with established sperm staining techniques.

Main Methods:

  • Semen samples from 85 donors undergoing intracytoplasmic sperm injection (ICSI) were analyzed.
  • Confocal Raman spectroscopy was used to obtain spectra from normal morphology sperm.
  • Sperm were simultaneously stained using Chromomycin A3 (CMA3), aniline blue, and acridine orange to assess protamine deficiency, histone retention, and DNA fragmentation.
  • Spectral analysis was performed using custom LabVIEW software, grouping samples based on CMA3 staining levels.

Main Results:

  • Significant correlations were found between Raman peak intensities and sperm staining results for protamine deficiency, histone retention, and DNA fragmentation.
  • Median intensities of specific Raman peaks showed significant differences between groups with low (CMA3≤41) and high (CMA3>41) chromatin condensation levels.
  • Raman spectroscopy demonstrated an ability to detect sperm with chromatin abnormalities at the individual cell level.

Conclusions:

  • Confocal Raman spectroscopy is a promising label-free diagnostic tool for assessing sperm chromatin abnormalities.
  • This technique shows potential for identifying sperm with improper chromatin condensation and DNA fragmentation.
  • Raman spectroscopy could complement or replace existing invasive staining methods in assisted reproduction.