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• W2076836192 endingPage "e1001329" @default.
• W2076836192 startingPage "e1001329" @default.
• W2076836192 abstract "The chiasma is a structure that forms between a pair of homologous chromosomes by crossover recombination and physically links the homologous chromosomes during meiosis. Chiasmata are essential for the attachment of the homologous chromosomes to opposite spindle poles (bipolar attachment) and their subsequent segregation to the opposite poles during meiosis I. However, the overall function of chiasmata during meiosis is not fully understood. Here, we show that chiasmata also play a crucial role in the attachment of sister chromatids to the same spindle pole and in their co-segregation during meiosis I in fission yeast. Analysis of cells lacking chiasmata and the cohesin protector Sgo1 showed that loss of chiasmata causes frequent bipolar attachment of sister chromatids during anaphase. Furthermore, high time-resolution analysis of centromere dynamics in various types of chiasmate and achiasmate cells, including those lacking the DNA replication checkpoint factor Mrc1 or the meiotic centromere protein Moa1, showed the following three outcomes: (i) during the pre-anaphase stage, the bipolar attachment of sister chromatids occurs irrespective of chiasma formation; (ii) the chiasma contributes to the elimination of the pre-anaphase bipolar attachment; and (iii) when the bipolar attachment remains during anaphase, the chiasmata generate a bias toward the proper pole during poleward chromosome pulling that results in appropriate chromosome segregation. Based on these results, we propose that chiasmata play a pivotal role in the selection of proper attachments and provide a backup mechanism that promotes correct chromosome segregation when improper attachments remain during anaphase I." @default.
• W2076836192 created "2016-06-24" @default.
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• W2076836192 date "2011-03-10" @default.
• W2076836192 modified "2023-10-11" @default.
• W2076836192 title "Chiasmata Promote Monopolar Attachment of Sister Chromatids and Their Co-Segregation toward the Proper Pole during Meiosis I" @default.
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• W2076836192 doi "https://doi.org/10.1371/journal.pgen.1001329" @default.
• W2076836192 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/3053323" @default.
• W2076836192 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/21423721" @default.
• W2076836192 hasPublicationYear "2011" @default.
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