Increased chromosome 16 disomy rates in human spermatozoa and recurrent spontaneous abortions

Capsule:
Meiotic errors involving chromosome 16 of paternal origin seem to have an equally important influence on to the overall fetal aneuploidy rate compared with maternal chromosome 16 disomy.

Authors:
Michaela Neusser, Ph.D., Nina Rogenhofer, M.D., Stephanie Dürl, Robert Ochsenkühn, M.D., Matthias Trottmann, M.D., Vindi Jurinovic, Ortrud Steinlein, M.D., Ph.D., Viktoria von Schönfeldt, Stefan Müller, Ph.D., Christian J. Thaler, M.D.

Volume 104, Issue 5, Pages 1130-1137

Abstract:

Objective:
To investigate if unexplained recurrent spontaneous abortions (RSA) are associated with increased rates of aneuploidy in spermatozoa of RSA partners (“RSA-men”).

Design:
Case-control study.

Setting:
Academic research center.

Patient(s):
Patients enrolled at the Hormone and Fertility Center and controls at the Department of Urology (LMU-Munich).

Intervention(s):
Sperm samples of 11 partners of unexplained RSA cases evaluated for elevated diploidy and disomy levels of chromosomes 1–22, X, and Y by multicolor sperm fluorescence in situ hybridization (FISH).

Main Outcome Measure(s):
Aneuploidy rates obtained in RSA-men compared with controls from the literature and internally; an increase of the aneuploidy rate was considered statistically significant, when it differed ≥2 standard deviations from the mean baseline level in controls.

Result(s):
Our sperm FISH data on RSA men showed increased disomy rates for at least three chromosomes in more than 60% of patients but no statistically significant increase of the overall mean sperm disomy or diploidy rate. In particular, meiotic errors involving chromosome 16 contributed to increased sperm disomy in more than 60% of our patients.

Conclusion(s):
These data suggest that among paternal meiotic errors nondisjunction of chromosome 16 might have similar relative influence on fetal aneuploidy compared with maternal chromosome 16 disomy.

  • msamplaski

    This is interesting data, which will be of interest to couples frustrated by RPL. What were the criteria for “control men”? Were these men with demonstrated natural pregnancies? Also, did the aneuploidy rates correlate with abnormal semen analyses?

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