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First published online 17 February 2004
doi: 10.1242/jcs.00947
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Research Article |
1 Departamento de Biología, Edificio de Biológicas, Universidad Autónoma de Madrid, 28049 Madrid, Spain
2 Department of Cell and Developmental Biology, Theodor Boveri Institute, University of Würzburg, 97074 Würzburg, Germany
3 Departamento de Genética, Facultad de Biología, Universidad Complutense, 28040 Madrid, Spain
* Author for correspondence (e-mail: jose.suja{at}uam.es)
Accepted 20 October 2003
SCP3 is a meiosis-specific structural protein appearing at axial elements and lateral elements of the synaptonemal complex. We have analysed the behaviour of SCP3 and the cohesin subunit Rad21 in mouse spermatocytes by means of a squashing technique. Our results demonstrate that both proteins colocalize and are partially released from chromosome arms during late prophase I stages, although they persist at the interchromatid domain of metaphase I bivalents. Thus, Rad21 cannot be considered a `mitotic'-specific variant, but coexists with Rec8. During late prophase I SCP3 and Rad21 accumulate at centromeres, and together with the chromosomal passenger proteins INCENP and aurora-B kinase, show a complex `double cornet'-like distribution at the inner domain of metaphase I centromeres beneath the associated sister kinetochores. We have observed that Rad21 and SCP3 are displaced from centromeres during telophase I when sister kinetochores separate, and are not present at metaphase II centromeres. Thus, we hypothesise that Rad21, and the superimposed SCP3 and SCP2, are involved in the monopolar attachment of sister kinetochores during meiosis I, and are not responsible for the maintenance of sister-chromatid centromere cohesion during meiosis II as previously suggested.
Key words: Meiosis, Mouse, Kinetochore, Monopolar attachment, Sister-chromatid cohesion
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