Comparative study of cytochemical tests for sperm chromatin integrity

Area of Science:

• Reproductive Biology
• Genetics
• Cytochemistry

Background:

• Sperm DNA integrity is crucial for male fertility.
• Assessing sperm chromatin structure aids in diagnosing infertility.
• Existing cytochemical tests vary in sensitivity and practicality.

Purpose of the Study:

• To evaluate and compare the practical value of two DNA in situ denaturation methods (acridine orange and Tejada) alongside routine aniline blue and toluidine blue tests.
• To estimate and compare the sensitivity of these methods for assessing sperm chromatin structure.
• To analyze sperm DNA integrity in fertile and infertile men and animal models.

Main Methods:

• Utilized acridine orange (AO), aniline blue (AB), and toluidine blue (TB) staining methods on sperm from 40 men.
• Applied modified Rigler-Roschlau and Tejada methods for DNA in situ denaturation.
• Tested methods on rat and boar spermiogenesis models to assess sperm maturation.

Main Results:

• All four methods demonstrated good correlation (r = .63-.70; P < .01) in identifying abnormal sperm chromatin structure.
• Fertile men showed 17% +/- 3.8% abnormal cells (Rigler-Roschlau), while infertile men had 30.2% +/- 6.8%.
• The Tejada method indicated higher abnormality rates (23.9% fertile, 52.1% infertile).

Conclusions:

• All evaluated in situ cytochemical tests are sufficiently sensitive for estimating sperm DNA integrity.
• The Rigler-Roschlau and Tejada methods provide valuable insights into sperm chromatin structure and DNA normality.
• These techniques can aid in the diagnosis of male infertility and understanding sperm maturation.