Semen quality in men with Y chromosome aberrations

Area of Science:

• Human Genetics
• Reproductive Biology
• Cytogenetics

Background:

• Male infertility is frequently associated with chromosomal abnormalities.
• Y chromosome structural aberrations can significantly impact male fertility.
• Understanding genotype-phenotype correlations is crucial for diagnosing and managing infertility.

Purpose of the Study:

• To investigate genotype-phenotype correlations in infertile men with Y chromosome abnormalities.
• To evaluate the impact of balanced and unbalanced structural aberrations on spermatogenesis.
• To explore the role of meiotic pairing defects and X chromosome inactivation in male infertility.

Main Methods:

• Studied 13 infertile males with Y chromosome aberrations.
• Performed seminal fluid analysis, andrological examination, hormone assays, and testicular ultrasound.
• Conducted conventional and molecular cytogenetic analysis, including Y chromosome microdeletion studies.

Main Results:

• Identified meiotic pairing defects as a primary cause of spermatogenesis arrest in infertile men with Y chromosome aberrations.
• Demonstrated that these defects impair fertility irrespective of azoospermic factor (AZF) microdeletions or mosaicism.
• Observed a correlation between meiotic failure and potential issues with X chromosome inactivation during meiosis.

Conclusions:

• Meiotic pairing defects are critical in spermatogenesis failure associated with Y chromosome abnormalities.
• Failure of X chromosome inactivation during meiotic prophase may underlie spermatogenesis arrest.
• These findings highlight the complex genetic basis of male infertility and the importance of meiotic processes.