Objective: To determine the meiotic behavior of a ring Y chromosome in a semen sample from a 45,X/46,X,r(Y)/46,X,dic r(Y) patient and the possible interchromosomal effects of the ring on other chromosome pairs. Design: Retrospective analysis. Setting: Universitat Autònoma de Barcelona. Patient: An oligoasthenoteratozoospermic patient who presented for infertility consultation. Main Outcome Measure(s): The sex chromosome content of spermatogenic cells, meiotic figures, and spermatozoa in the ejaculate and the possible interchromosomal effects on chromosomes 13, 18, and 21 were analyzed by using multicolor fluorescence in situ hybridization. Germ-cell aneuploidies were scored. Result(s): X0 cells are meiotically incompetent. All meiotic figures were exclusively XY, and 80% showed unpaired sex chromosomes. A high proportion of postreductional cells were XY (45.5%) or nullisomic for sex chromosomes (13.92%). This percentage decreased in spermatozoa to 14.89% and 27.66%, respectively. A statistically significant increase in X-bearing versus Y-bearing cells both in postreductional cells (23.9% vs. 14.3%) and spermatozoa (41.9% vs. 19.3%) was also observed. Evidence for an interchromosomal effect on chromosome 21 was detected. Conclusion(s): Data suggest that this patient had a generalized increase incidence of chromosome anomalies, underscoring the importance of incorporating screening for sperm aneuploidies in genetic analysis of affected patients. © 2003 by American Society for Reproductive Medicine.
- Fluorescence in situ hybridization
- Interchromosomal effects
- Ring Y chromosome