Scientific aspects of preconception gender selection

Area of Science:

• Reproductive biology
• Genetics
• Assisted reproductive technology

Background:

• Many methods for influencing offspring gender lack scientific validation.
• Preconception gender selection is crucial for preventing X-linked genetic disorders.

Purpose of the Study:

• To evaluate the safety and efficacy of a flow cytometric sperm sorting technique for gender selection.
• To assess the method's potential for family balancing and genetic disease prevention.

Main Methods:

• Utilized flow cytometry to sort sperm based on differential fluorescence of X and Y chromosomes.
• Employed Fluorescence In-Situ Hybridization (FISH) to verify sperm sorting accuracy.
• Assessed pregnancy and congenital abnormality rates following assisted reproductive procedures (IUI, IVF/ICSI).

Main Results:

• Sperm sorting successfully shifted the X:Y chromosome ratio from 50:50 to 90% X or 75% Y.
• Embryo, fetal, and baby genders aligned with post-sort FISH analysis.
• Pregnancy and clinical loss rates were comparable to established assisted reproduction outcomes.
• The major congenital abnormality rate was 2.05%, similar to spontaneous occurrences.

Conclusions:

• The flow cytometric sperm sorting method (MicroSort) is a safe and effective technique for gender selection.
• This method offers a valuable option for family balancing and reducing the incidence of X-linked diseases.