Objective: To raise the possibility that a familial chromosomal translocation associated with teratozoospermia can disrupt a gene necessary for flagellum assembly.
Design: Case report.
Setting: University hospital.
Patient(s): Two brothers with infertility related to anomalies of meiotic division and of the flagella assembly, presenting the same balanced 5-12 autosomal translocation.
Intervention(s): Several intracytoplasmic sperm injection (ICSI) cycles in our IVF department for both couples.
Main outcome measure(s): Sperm analysis, karyotypes, electron microscopy, and fluorescence in situ hybridization (FISH) analysis of spermatozoa performed using probes coding for chromosomes X, Y, 13, 18, and 21.
Result(s): In both brothers, sperm analysis indicated a tail stump syndrome. Electron microscopy analysis displayed complex abnormalities, which were probably related to meiotic errors. The FISH analysis indicated an increase of diploid germ cells. Karyotypes of both patients revealed the same balanced chromosomal t(5;12) (p15.1; q21) translocation. Results of ICSI cycles were comparable for both couples. A twin pregnancy was achieved in one of these two couples, but a spontaneous miscarriage occurred at 10 weeks of gestation.
Conclusion(s): The flagella anomalies raise the possibility that the translocation disrupts a gene necessary for the flagellum assembly, although a mutation in a gene unrelated to the chromosome breakpoints cannot be excluded.