Reference - PMID:16325576 - The kinetochore protein Moa1 enables cohesion-mediated monopolar attachment at meiosis I.

Reference summary

PubMed ID

PMID:16325576

Title

The kinetochore protein Moa1 enables cohesion-mediated monopolar attachment at meiosis I.

Authors

Yokobayashi S, Watanabe Y

Citation

Cell 2005 Dec 02;123(5):803-17

Publication year

2005

Abstract

Meiosis resembles mitosis but employs a unique "reductional" nuclear division to allow the production of haploid gametes from diploid cells. The crucial ploidy reduction step requires that sister kinetochores attach to microtubules emanating from the same spindle pole, achieving "monopolar attachment," which ensures that maternal and paternal chromosomes are segregated. Here we screened for factors required to establish monopolar attachment in fission yeast and identified a novel protein, Moa1. Moa1 is meiosis specific and localizes exclusively to the central core of the centromere, a region that binds meiotic Rec8-containing cohesin complexes but not mitotic Rad21/Scc1-containing complexes. Enforced cleavage of Rec8 in the central core region led to the disruption of monopolar attachment, as in moa1Delta cells, without diminishing Moa1 localization. Moa1 physically interacts with Rec8, implying that Moa1 functions only through Rec8, presumably to facilitate central core cohesion. These results prove that monoorientation of kinetochores is established in a cohesion-mediated manner.

Annotation