Mosaic variegated aneuploidy in mouse BubR1 deficient embryos and pregnancy loss in human View Full Text


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Article Info

DATE

2014-07-01

AUTHORS

Michael Schmid, Claus Steinlein, Qi Tian, Amy E. Hanlon Newell, Manfred Gessler, Susan B. Olson, Andreas Rosenwald, Burkhard Kneitz, Lev M. Fedorov

ABSTRACT

Chromosome aberrations (aneuploidies mostly) are the cause of the majority of spontaneous abortions in humans. However, little is known about defects in the underlying molecular mechanisms resulting in chromosome aberrations and following failure of preimplantation embryo development, initiation of implantation and postimplantation pregnancy loss. We suggest that defects of the spindle assembly checkpoint (SAC) are responsible for aneuploidy and the following abortions. To develop our hypothesis, we modeled this process in the mouse after inactivation of protein BubR1, one of the key players of SAC. We found that soon after implantation, more than 50 % of cells of BubR1−/− embryos were aneuploid and had an increased level of premature sister chromatid separation (PSCS). Aneuploid cells do not have a predominant gain or loss of some specific chromosomes, but they have mosaic variegated aneuploidy (MVA), which is characterised by random mixture of different chromosomes. MVA leads to growth retardation, stochastic massive apoptosis, disruption of bilateral symmetry, and embryo death between embryonic days 7.5 to 13.5. Analysis published human data revealed that human recurrent pregnancy loss (RPL) embryos and rare infant patients carrying BubR1 mutations that have been described so far have the PSCS and MVA as in BubR1 deficient/insufficient mice. Based on this data, we predict that deficiency/insufficiency of BubR1 and other components of the SAC in human are responsible for a significant fraction of both early and late RPLs. More... »

PAGES

375-392

References to SciGraph publications

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  • Identifiers

    URI

    http://scigraph.springernature.com/pub.10.1007/s10577-014-9432-x

    DOI

    http://dx.doi.org/10.1007/s10577-014-9432-x

    DIMENSIONS

    https://app.dimensions.ai/details/publication/pub.1032643565

    PUBMED

    https://www.ncbi.nlm.nih.gov/pubmed/24981203


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