Chromosome defects and male factor infertility

Area of Science:

• Genetics
• Reproductive Medicine
• Urology

Background:

• Routine semen analysis and endocrine evaluation are standard for male infertility.
• Recent guidelines emphasize assessing chromosomal anomalies in men with spermatogenic failure.
• Chromosomal abnormalities are a significant, yet often overlooked, cause of male factor infertility.

Purpose of the Study:

• To review chromosomal anomalies as a cause of male factor infertility.
• To explain technical approaches for identifying chromosomal defects.
• To discuss the clinical consequences of these abnormalities for male infertility.

Main Methods:

• Narrative review of existing literature on chromosomal anomalies and male infertility.
• Analysis of current diagnostic guidelines and their limitations.
• Discussion of various cytogenetic anomalies, including numerical and structural defects.

Main Results:

• Karyotype anomalies are found in approximately 6% of men with infertility.
• Numerical anomalies include Klinefelter syndrome and other sex chromosome aneuploidies.
• Structural anomalies (translocations, inversions, etc.) can cause diverse sperm defects and impact offspring health.

Conclusions:

• Current criteria for chromosomal assessment in male infertility may need expansion.
• Testing should be considered for men with sperm counts below 20 million/mL, not just severe oligozoospermia.
• Identifying chromosomal etiology improves understanding of infertility, guiding treatment and reproductive outcomes.