Change search
ReferencesLink to record
Permanent link

Direct link
Ago1 and Dcr1, two core components of the RNA interference pathway, functionally diverge from Rdp1 in regulating cell cycle events in Schizosaccharomyces pombe
Södertörn University, School of Chemistry, Biology, Geography and Environmental Science.
2004 (English)In: Molecular Biology of the Cell, ISSN 1059-1524, E-ISSN 1939-4586, Vol. 15, no 3, 1425-1435 p.Article in journal (Refereed) Published
Abstract [en]

In the fission yeast Schizosaccharomyces pombe, three genes that function in the RNA interference (RNAi) pathway, ago1(+), dcr1(+), and rdp1(+), have recently been shown to be important for timely formation of heterochromatin and accurate chromosome segregation. In the present study, we present evidence that null mutants for ago1(+) and dcr1(+) but not rdp1(+), exhibit abnormal cytokinesis, cell cycle arrest deficiencies, and mating defects. Subsequent analyses showed that ago1(+) and dcr1(+) are required for regulated hyperphosphorylation of Cdc2 when encountering genotoxic insults. Because rdp1(+) is dispensable for this process, the functions of ago1(+) and dcr1(+) in this pathway are presumably independent of their roles in RNAi-mediated heterochromatin formation and chromosome segregation. This was further supported by the finding that ago1(+) is a multicopy suppressor of the S-M checkpoint deficiency and cytokinesis defects associated with loss of Dcr1 function, but not for the chromosome segregation defects of this mutant. Accordingly, we conclude that Dcr1-dependent production of small interfering RNAs is not required for enactment and/or maintenance of certain cell cycle checkpoints and that Ago1 and Dcr1 functionally diverge from Rdp1 to control cell cycle events in fission yeast. Finally, exogenous expression of hGERp95/EIF2C2/hAgo2, a human Ago1 homolog implicated in posttranscriptional gene silencing, compensated for the loss of ago1(+) function in S. pombe. This suggests that PPD proteins may also be important for regulation of cell cycle events in higher eukaryotes.

Place, publisher, year, edition, pages
2004. Vol. 15, no 3, 1425-1435 p.
National Category
Cell Biology
URN: urn:nbn:se:sh:diva-15489DOI: 10.1091/mbc.E03-06-0433ISI: 000220051900045OAI: diva2:504565
Available from: 2012-02-21 Created: 2012-02-20 Last updated: 2012-02-21Bibliographically approved

Open Access in DiVA

No full text

Other links

Publisher's full text

Search in DiVA

By author/editor
Ekwall, Karl
By organisation
School of Chemistry, Biology, Geography and Environmental Science
In the same journal
Molecular Biology of the Cell
Cell Biology

Search outside of DiVA

GoogleGoogle Scholar

Altmetric score

Total: 37 hits
ReferencesLink to record
Permanent link

Direct link