Expression and functional dynamics of the XCAP-D2 condensin subunit in Xenopus laevis oocytes. - Université de Rennes Accéder directement au contenu
Article Dans Une Revue Journal of Biological Chemistry Année : 2003

Expression and functional dynamics of the XCAP-D2 condensin subunit in Xenopus laevis oocytes.

Résumé

The 13 S condensin complex plays a crucial role in the condensation and segregation of the two sets of chromosomes during mitosis in vivo as well as in cell-free extracts. This complex, conserved from yeast to human, contains a heterodimer of structural maintenance of chromosome (SMC) family proteins and three additional non-SMC subunits. We have investigated the expression of the non-SMC condensin component XCAP-D2 in Xenopus laevis oocytes. When studied during meiotic maturation, XCAP-D2 starts to accumulate at the time of germinal vesicle breakdown and reaches its maximal amount in metaphase II oocytes. This accumulation is specifically blocked by injection of antisense oligonucleotides. XCAP-D2 antisense-injected oocytes progress normally through meiosis until metaphase II. At this stage, however, chromosomes exhibit architecture defaults, and resolution of sister chromatids is impaired. Surprisingly, in mitotic extracts made from XCAP-D2 knocked-down oocytes, sperm chromatin normally condenses into compacted chromosomes, whereas the amounts of both free and chromosome-bound XCAP-D2 are markedly reduced. This apparent discrepancy is discussed in light of current knowledge on chromosome dynamics.

Dates et versions

inserm-00292943 , version 1 (03-07-2008)

Identifiants

Citer

Erwan Watrin, Fabien Cubizolles, Howard Beverley Osborne, Katherine Le Guellec, Vincent Legagneux. Expression and functional dynamics of the XCAP-D2 condensin subunit in Xenopus laevis oocytes.. Journal of Biological Chemistry, 2003, 278 (28), pp.25708-15. ⟨10.1074/jbc.M300192200⟩. ⟨inserm-00292943⟩
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