Mps1 and Ipl1/Aurora B Act Sequentially to Correctly Orient Chromosomes on the Meiotic Spindle of Budding Yeast | Zendy

Régis E. Meyer | Zendy; Seoyoung Kim | Zendy; David Obeso | Zendy; Paul D. Straight | Zendy; Mark Winey | Zendy; Dean Dawson | Zendy

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Mps1 and Ipl1/Aurora B Act Sequentially to Correctly Orient Chromosomes on the Meiotic Spindle of Budding Yeast

Author(s) -

Régis E. Meyer,

Seoyoung Kim,

David Obeso,

Paul D. Straight,

Mark Winey,

Dean Dawson

Publication year - 2013

Publication title -

science

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 12.556

H-Index - 1186

eISSN - 1095-9203

pISSN - 0036-8075

DOI - 10.1126/science.1232518

Subject(s) - chromosome segregation , meiosis , microbiology and biotechnology , aurora b kinase , kinetochore , biology , microtubule , spindle checkpoint , spindle pole body , spindle apparatus , genetics , chromosome , cell division , cell , gene

The conserved kinases Mps1 and Ipl1/Aurora B are critical for enabling chromosomes to attach to microtubules so that partner chromosomes will be segregated correctly from each other, but the precise roles of these kinases have been unclear. We imaged live yeast cells to elucidate the stages of chromosome-microtubule interactions and their regulation by Ipl1 and Mps1 through meiosis I. Ipl1 was found to release kinetochore-microtubule (kMT) associations after meiotic entry, liberating chromosomes to begin homologous pairing. Surprisingly, most chromosome pairs began their spindle interactions with incorrect kMT attachments. Ipl1 released these improper connections, whereas Mps1 triggered the formation of new force-generating microtubule attachments. This microtubule release and reattachment cycle could prevent catastrophic chromosome segregation errors in meiosis.

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