Mnd2, an essential antagonist of the anaphase-promoting complex during meiotic prophase

Alexandra Penkner, Susanne Prinz, Stefan Ferscha, Franz Klein

    Veröffentlichungen: Beitrag in FachzeitschriftArtikelPeer Reviewed

    Abstract

    Meiotic cohesin serves in sister chromatid linkage and DNA repair until its subunit Rec8 is cleaved by separase. Separase is activated when its inhibitor, securin, is polyubiquitinated by the Cdc20 regulated anaphase-promoting complex (APCCdc20) and consequently degraded. Differently regulated APCs (APCCdh1, APCAma1) have not been implicated in securin degradation at meiosis I. We show that Mnd2, a factor known to associate with APC components, prevents premature securin degradation in meiosis by APC Ama1. mnd2? cells lack linear chromosome axes and exhibit precocious sister chromatid separation, but deletion of AMA1 suppresses these defects. Besides securin, Sgo1, a protein essential for protection of centromeric cohesion during anaphase I, is also destabilized in mnd2? cells. Mnd2's disappearance prior to anaphase II may activate APC Ama1. Human oocytes may spend many years in meiotic prophase before maturation. Inhibitors of meiotic APC variants could prevent loss of chiasmata also in these cells, thereby guarding against aberrant chromosome segregation. Copyright Œ2005 by Elsevier Inc.
    OriginalspracheEnglisch
    Seiten (von - bis)789-801
    Seitenumfang13
    FachzeitschriftCell
    Jahrgang120
    Ausgabenummer6
    DOIs
    PublikationsstatusVeröffentlicht - 2005

    ÖFOS 2012

    • 1060 Biologie

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