Sex Selection of Human Spermatozoa

The study aim is to test a simple, reliable, and inexpensive method to attempt selection of gender specific spermatozoa. Couples will undergo evaluation and treatment according to the standard clinic procedures. Sperm samples provided for infertility treatment will be further analyzed routine semen analysis for volume, concentration, mobility and morphology. Sperm samples will be provided by consenting males undergoing infertility treatment. A multilayer density gradient will be performed utilizing an FDA approved solution, Enhance-S Plus Cell Isolation Media (Vitrolife, San Diego, CA).

This density gradient is also used for standard semen preparation for intrauterine insemination. X-bearing spermatozoa and Y-bearing spermatozoa will be identified from the density gradient fractions. Sperm suspensions will be smeared on slides for FISH analysis using centromeric probes for chromosomes 18, X, and Y. The ratio of X- to Y- chromosome bearing spermatozoa will be assessed as a percentage on at least 200 cells per slide. Aneuploid cells and those without signals will be omitted. Unselected fractions of each sample will serve as controls. The rate of X-bearing spermatozoa after 4-layer density gradient will be calculated. After thorough counseling, the selected preconception gender specimen will then be utilized for assisted reproductive fertilization- in vitro fertilization with or without intracytoplasmic sperm injection (ICSI) or intra uterine insemination which are routine standard of care procedures.