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Updated: Jun 2, 2026

Flow Cytometric Analysis of Biomarkers for Detecting Human Sperm Functional Defects

Flow Cytometric Analysis of Biomarkers for Detecting Human Sperm Functional Defects

Published on: April 21, 2022

Relationship between DNA damage and sperm head birefringence.

C G Petersen¹, L D Vagnini, A L Mauri

¹Center for Human Reproduction Prof. Franco Junior, Ribeirão Preto, Brazil.

Reproductive Biomedicine Online

|April 22, 2011

Summary

Human sperm head birefringence (SHBF) patterns are linked to DNA damage. Total SHBF is associated with significantly higher sperm DNA fragmentation, indicating a potential biomarker for male reproductive health.

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Area of Science:

Reproductive Biology
Biophysics
Molecular Biology

Background:

Birefringence, or double refraction, occurs when light passes through anisotropic materials.
Sperm cells exhibit optical anisotropy, making them suitable for birefringence studies.
Understanding sperm optical properties may offer insights into sperm quality.

Purpose of the Study:

To investigate the association between human sperm head birefringence (SHBF) patterns and sperm DNA damage.
To differentiate between total (SHBF-T) and partial (SHBF-P) birefringence in relation to DNA integrity.
To explore SHBF as a potential indicator of DNA fragmentation and denaturation in spermatozoa.

Main Methods:

Semen samples from 26 healthy males were analyzed.
Sperm head birefringence patterns (SHBF-T and SHBF-P) were assessed.
Sperm DNA fragmentation was evaluated using the terminal deoxyribonucleotidyl transferase (TdT)-mediated dUDP nick-end labelling assay.
Sperm DNA denaturation was assessed using acridine orange fluorescence.

Main Results:

A significantly higher incidence of positive DNA fragmentation was observed in spermatozoa with total SHBF (19.5%) compared to those with partial SHBF (7.3%) (P<0.0001).
The percentage of denatured DNA showed no significant difference between spermatozoa with total SHBF (65.6%) and partial SHBF (66.0%).
These findings suggest a specific link between total SHBF and DNA fragmentation.

Conclusions:

The study supports a positive relationship between total SHBF in sperm heads and increased DNA fragmentation.
SHBF patterns may serve as a non-invasive indicator of sperm DNA integrity.
Further research could explore the clinical implications of SHBF in male infertility assessments.