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Bizzari F and Marston AL  (2011) Cdc55 coordinates spindle assembly and chromosome disjunction during meiosis. J Cell Biol 193(7):1213-28

Abstract: During meiosis, two consecutive nuclear divisions follow a single round of deoxyribonucleic acid replication. In meiosis I, homologues are segregated, whereas in meiosis II, sister chromatids are segregated. This requires that the sequential assembly and dissolution of specialized chromosomal factors are coordinated with two rounds of spindle assembly and disassembly. How these events are coupled is unknown. In this paper, we show, in budding yeast, that the protein phosphatase 2A regulatory subunit Cdc55 couples the loss of linkages between chromosomes with nuclear division by restraining two other phosphatases, Cdc14 and PP2A(Rts1). Cdc55 maintains Cdc14 sequestration in the nucleolus during early meiosis, and this is essential for the assembly of the meiosis I spindle but not for chromosomes to separate. Cdc55 also limits the formation of PP2A holocomplexes containing the alternative regulatory subunit Rts1, which is crucial for the timely dissolution of sister chromatid cohesion. Therefore, Cdc55 orders passage through the meiotic divisions by ensuring a balance of phosphatases.

Status: Published Type: Journal Article PubMed ID: 21690308

Topics addressed in this paper

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Topics Genes linked to topics (#1 - 10 )
ASE1 CDC14 CDC55 CLB1 FIN1 IPL1 MAD2 MAM1 MCD1 PDS1
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Topics Genes linked to topics (#11 - 15 )
REC8 RTS1 SGO1 SPO11 TPD3
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