Acrocentric bivalents positioned preferentially nearby to the XY pair in metaphase i human spermatocytes

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Objective: To analyze whether the preferential proximity between acrocentric bivalents and the XY pair described at pachytene was maintained in metaphase I human spermatocytes. Design: Proximity frequencies of autosomic bivalents to the sex bivalent were evaluated with the analysis of meiotic preparations combining sequentially standard techniques and multiplex fluorescence in situ hybridization. Setting: Assisted reproduction centers. Patient(s): Thirty-seven men consulting for fertility problems. Intervention(s): Unilateral testicular biopsies. Main Outcome Measure(s): Proximity frequencies analysis to the XY pair, evaluated individually and grouping bivalents, was carried out using a logistical regression model with repeated measures. Result(s): Bivalents 22 and 15 were observed more frequently near to the sex bivalent than the others. Significant interindividual differences were not observed. Conclusion(s): Results suggest that bivalents distribution to the metaphase plate is nonrandom. The maintenance of the acrocentric chromosomes' proximity to the sex bivalent from pachytene to metaphase I would indicate that the relative bivalents position would be notably preserved. The observation of non-interindividual variability, despite different infertility etiology, suggests that the nuclear organization pattern remains largely unaffected even if spermatogenesis is compromised. Copyright © 2012 American Society for Reproductive Medicine, Published by Elsevier Inc.
Original languageEnglish
Pages (from-to)1241-1245
JournalFertility and Sterility
Issue number5
Publication statusPublished - 1 Nov 2012


  • Acrocentric chromosomes
  • chromosome territories
  • human spermatocytes
  • metaphase I
  • XY bivalent

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