An improved, efficient method for analyzing human sperm chromosomes using zona-free hamster ova.

Area of Science:

• Human reproductive biology
• Cytogenetics
• Sperm analysis

Background:

• Accurate human sperm chromosome analysis is crucial for reproductive health.
• Existing methods have limitations in fertilization efficiency and chromosome preparation.

Purpose of the Study:

• To develop an improved method for analyzing human sperm chromosomes using zona-free hamster oocytes.
• To enhance fertilization rates and ensure monospermic fertilization.
• To assess spontaneous chromosome aberration rates in human spermatozoa.

Main Methods:

• Optimized sperm treatment with ionophore A23187 and human serum albumin (HSA) for capacitation.
• Controlled insemination with low sperm concentration for short duration to ensure monospermy.
• Post-insemination culture in Medium 199 and karyogamy/cleavage block using podophyllotoxin and vinblastine.
• Chromosome slide preparation using a gradual fixation-air-dry method.

Main Results:

• Achieved successful karyotyping of 43%-79% of inseminated oocytes.
• Identified spontaneous aneuploidy (0.9%) and structural anomalies (13.0%) in human sperm chromosomes.
• Determined an X:Y sperm ratio of 53%:47%.

Conclusions:

• The developed method significantly improves human sperm chromosome analysis efficiency.
• The study provides baseline data on spontaneous chromosome aberration rates and X:Y sperm ratios.
• Further refinement of chromosome banding techniques is needed for enhanced quality.