AZFc partial deletions in Chilean men with severe spermatogenic failure

Area of Science:

• Human Genetics
• Reproductive Biology
• Andrology

Background:

• Y chromosome microdeletions, particularly in the AZFc region, are a known cause of male infertility.
• Understanding the prevalence and impact of specific AZFc subdeletions is crucial for diagnosing and managing male factor infertility.

Purpose of the Study:

• To investigate the frequency of AZFc subdeletions in infertile Chilean men experiencing severe spermatogenic impairment.
• To assess the correlation between specific AZFc subdeletions and the severity of spermatogenic defects.

Main Methods:

• A prospective analysis was conducted at a university infertility clinic.
• Genomic DNA from 95 infertile men with azoospermia/oligozoospermia and 77 control men was analyzed using polymerase chain reaction (PCR) for DAZ gene variants and AZFc subdeletions.
• Testicular characterization, including biopsy, hormonal assays, and physical evaluation, was performed.

Main Results:

• AZFc subdeletions were identified in 2.1% of infertile men, including gr/gr subtypes affecting DAZ1/DAZ2 or DAZ3/DAZ4, and a g1/g3 subdeletion.
• In control groups, gr/gr subdeletions (2.6%) were observed in fertile/normozoospermic and azoospermic men with normal spermatogenesis.
• No significant association was found between AZFc subdeletions and severe spermatogenic impairment.

Conclusions:

• AZFc subdeletions do not appear to be a primary cause of severe spermatogenic impairment in the studied population.
• The gr/gr-DAZ1/DAZ2 subdeletion subtype does not seem to affect fertility in Chilean men.