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Chromosome architecture and low cohesion bias acrocentric chromosomes towards aneuploidy during mammalian meiosis

Author

Listed:
  • Eirini Bellou

    (Max Planck Institute for Multidisciplinary Sciences)

  • Agata P. Zielinska

    (Max Planck Institute for Multidisciplinary Sciences)

  • Eike Urs Mönnich

    (Max Planck Institute for Multidisciplinary Sciences)

  • Nina Schweizer

    (Max Planck Institute for Multidisciplinary Sciences)

  • Antonio Z. Politi

    (Max Planck Institute for Multidisciplinary Sciences)

  • Antonina Wellecke

    (Max Planck Institute for Multidisciplinary Sciences)

  • Claus Sibold

    (Fertility Center Berlin)

  • Andreas Tandler-Schneider

    (Fertility Center Berlin)

  • Melina Schuh

    (Max Planck Institute for Multidisciplinary Sciences)

Abstract

Aneuploidy in eggs is a leading cause of miscarriages or viable developmental syndromes. Aneuploidy rates differ between individual chromosomes. For instance, chromosome 21 frequently missegregates, resulting in Down Syndrome. What causes chromosome-specific aneuploidy in meiosis is unclear. Chromosome 21 belongs to the class of acrocentric chromosomes, whose centromeres are located close to the chromosome end, resulting in one long and one short chromosome arm. We demonstrate that acrocentric chromosomes are generally more often aneuploid than metacentric chromosomes in porcine eggs. Kinetochores of acrocentric chromosomes are often partially covered by the short chromosome arm during meiosis I in human and porcine oocytes and orient less efficiently toward the spindle poles. These partially covered kinetochores are more likely to be incorrectly attached to the spindle. Additionally, sister chromatids of acrocentric chromosomes are held together by lower levels of cohesin, making them more vulnerable to age-dependent cohesin loss. Chromosome architecture and low cohesion therefore bias acrocentric chromosomes toward aneuploidy during mammalian meiosis.

Suggested Citation

  • Eirini Bellou & Agata P. Zielinska & Eike Urs Mönnich & Nina Schweizer & Antonio Z. Politi & Antonina Wellecke & Claus Sibold & Andreas Tandler-Schneider & Melina Schuh, 2024. "Chromosome architecture and low cohesion bias acrocentric chromosomes towards aneuploidy during mammalian meiosis," Nature Communications, Nature, vol. 15(1), pages 1-20, December.
  • Handle: RePEc:nat:natcom:v:15:y:2024:i:1:d:10.1038_s41467-024-54659-3
    DOI: 10.1038/s41467-024-54659-3
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    References listed on IDEAS

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    1. Marta N. Shahbazi & Tianren Wang & Xin Tao & Bailey A. T. Weatherbee & Li Sun & Yiping Zhan & Laura Keller & Gary D. Smith & Antonio Pellicer & Richard T. Scott & Emre Seli & Magdalena Zernicka-Goetz, 2020. "Developmental potential of aneuploid human embryos cultured beyond implantation," Nature Communications, Nature, vol. 11(1), pages 1-15, December.
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