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JCS ePress online publication date 29 Jun 2004
doi: 10.1242/jcs.01231

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Research Article

Sister-chromatid cohesion mediated by the alternative RF-CCtf18/Dcc1/Ctf8, the helicase Chl1 and the polymerase-{alpha}-associated protein Ctf4 is essential for chromatid disjunction during meiosis II


Mark Petronczki, Barbara Chwalla, Maria F. Siomos, Shihori Yokobayashi, Wolfgang Helmhart, Adam M. Deutschbauer, Ronald W. Davis, Yoshinori Watanabe, and Kim Nasmyth*
* Author for correspondence (e-mail: knasmyth{at}imp.univie.ac.at)

Cohesion between sister chromatids mediated by a multisubunit complex called cohesin is established during DNA replication and is essential for the orderly segregation of chromatids during anaphase. In budding yeast, a specialized replication factor C called RF-CCtf18/Dcc1/Ctf8 and the DNA-polymerase-{alpha}-associated protein Ctf4 are required to maintain sister-chromatid cohesion in cells arrested for long periods in mitosis. We show here that CTF8, CTF4 and a helicase encoded by CHL1 are required for efficient sister chromatid cohesion in unperturbed mitotic cells, and provide evidence that Chl1 functions during S-phase. We also show that, in contrast to mitosis, RF-CCtf18/Dcc1/Cft8, Ctf4 and Chl1 are essential for chromosome segregation during meiosis and for the viability of meiotic products. Our finding that cells deleted for CTF8, CTF4 or CHL1 undergo massive meiosis II non-disjunction suggests that the second meiotic division is particularly sensitive to cohesion defects. Using a functional as well as a cytological assay, we demonstrate that CTF8, CHL1 and CTF4 are essential for cohesion between sister centromeres during meiosis but dispensable for cohesin's association with centromeric DNA. Our finding that mutants in fission yeast ctf18 and dcc1 have similar defects suggests that the involvement of the alternative RF-CCtf18/Dcc1/Ctf8 complex in sister chromatid cohesion might be highly conserved.
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