Y chromosome micro-deletions in idiopathic infertility from Northern India

Area of Science:

• Genetics
• Reproductive Biology
• Molecular Biology

Background:

• The azoospermia factor (AZF) locus on the Y chromosome is crucial for spermatogenesis.
• Micro-deletions within AZF genes are implicated in male infertility, including azoospermia and oligozoospermia.
• Understanding the prevalence of these deletions is vital for diagnosing and managing male infertility.

Purpose of the Study:

• To determine the prevalence of Y chromosome micro-deletions in the AZF regions among infertile North Indian men.
• To correlate these micro-deletions with clinical and endocrinological parameters in infertile males.
• To assess the diagnostic utility of molecular screening for AZF micro-deletions.

Main Methods:

• Genomic DNA was extracted from peripheral blood of 79 infertile men (azoospermia/oligozoospermia).
• Polymerase chain reaction (PCR) analysis was performed using seven primer sets targeting AZFa, AZFb, and AZFc regions.
• Clinical examinations and endocrinological assessments were conducted alongside molecular analysis.

Main Results:

• Micro-deletions in AZF regions were identified in 5 out of 79 cases (6.3%) of infertile North Indian men.
• Deletions were observed in cases with both known and unknown etiologies, including one case with varicocele.
• The findings highlight the presence of AZF micro-deletions even in non-idiopathic infertility cases.

Conclusions:

• Y chromosome AZF micro-deletions represent a significant genetic cause of male infertility in the studied North Indian population.
• Molecular screening for AZF micro-deletions is recommended, particularly in non-idiopathic cases of male infertility.
• These genetic alterations contribute to spermatogenic failure and underscore the importance of genetic diagnostics in reproductive medicine.