Protamine 1/Protamine 2 mRNA ratio in nonobstructive azoospermic patients

Area of Science:

• Reproductive Biology
• Molecular Genetics
• Andrology

Background:

• Sperm quality and fertilizing ability are linked to the protamine 1 (PRM1)/ protamine 2 (PRM2) mRNA ratio in testicular biopsies.
• Assessing sperm quality in nonobstructive azoospermia (NOA) requires reliable markers beyond standard semen parameters.

Purpose of the Study:

• To evaluate the PRM1/PRM2 mRNA ratio in distinct subgroups of azoospermia.
• To determine the utility of the PRM1/PRM2 mRNA ratio as an accurate biomarker for sperm quality in NOA.

Main Methods:

• A cross-sectional study involving 106 azoospermic patients.
• Histological classification of testicular biopsy samples into obstructive azoospermia (OA), round spermatid maturation arrest (SMA), and Sertoli cell-only syndrome (SCOS).
• Quantitative reverse transcription polymerase chain reaction (RT-qPCR) to measure mRNA expression of JMJD1A, PRM1, PRM2, TNP1, and TNP2 genes.

Main Results:

• Sertoli cell-only syndrome (SCOS) group showed significantly lower expression of JMJD1A, PRM1, and PRM2.
• A significant increase in the PRM1/PRM2 mRNA ratio was observed in the SCOS group of NOA patients.
• A significant negative correlation was found between the PRM1/PRM2 mRNA ratio and JMJD1A expression.

Conclusions:

• The PRM1/PRM2 mRNA ratio may serve as a valuable and precise indicator of sperm quality in NOA.
• This ratio could complement existing semen parameters for a more comprehensive assessment of male fertility in azoospermic individuals.