Cytogenetics of infertile men

Area of Science:

• Human Genetics
• Reproductive Biology
• Cytogenetics

Background:

• Chromosomal abnormalities are a recognized cause of male infertility.
• Literature review indicates abnormal karyotypes in 13.7% of azoospermic and 4.6% of oligozoospermic males.
• Meiotic anomalies are implicated in 4.3-40.4% of male infertility cases.

Purpose of the Study:

• To investigate the cytogenetic basis of male infertility in a cohort of 694 men with abnormal sperm parameters.
• To explore the relationship between specific chromosome abnormalities and their impact on sperm count, morphology, and motility.
• To inform genetic counseling and treatment strategies, including intracytoplasmic sperm injection.

Main Methods:

• Cytogenetic analysis of 694 infertile men with abnormal sperm parameters.
• Review of literature on somatic and meiotic chromosome investigations in infertile males.
• Mention of fluorescent in-situ hybridization (FISH) and DNA analysis for sperm and blood.

Main Results:

• Sex chromosome abnormalities (e.g., 47,XXY) are common in azoospermic males.
• Autosome anomalies, including translocations, are frequent in oligozoospermic males.
• Impaired chromosome pairing in sperm may lead to spermatogenic disruption.

Conclusions:

• Cytogenetic investigations are crucial for diagnosing male infertility.
• Further research is required to correlate specific chromosomal abnormalities with sperm parameter deficits.
• Comprehensive genetic analysis, including mitotic/meiotic studies and DNA analysis, is recommended for infertile men to guide counseling and treatment.