Núcleo florescente de levedura

sexta-feira, junho 18, 2010

The Budding Yeast Nucleus

Angela Taddei1,2, Heiko Schober3 and Susan M. Gasser3

-Author Affiliations

1UMR 218, Centre National de la Recherche Scientifique, 26 rue d'Ulm, 75231 Paris Cedex 05, France
2Institut Curie-Section de Recherche, 26 rue d'Ulm, 75231 Paris Cedex 05, France
3Friedrich Miescher Institute for Biomedical Research, Maulbeerstrasse 66, CH-4058 Basel, Switzerland


The budding yeast nucleus, like those of other eukaryotic species, is highly organized with respect to both chromosomal sequences and enzymatic activities. At the nuclear periphery interactions of nuclear pores with chromatin, mRNA, and transport factors promote efficient gene expression, whereas centromeres, telomeres, and silent chromatin are clustered and anchored away from pores. Internal nuclear organization appears to be function-dependent, reflecting localized sites for tRNA transcription, rDNA transcription, ribosome assembly, and DNA repair. Recent advances have identified new proteins involved in the positioning of chromatin and have allowed testing of the functional role of higher-order chromatin organization. The unequal distribution of silent information regulatory factors and histone modifying enzymes, which arises in part from the juxtaposition of telomeric repeats, has been shown to influence chromatin-mediated transcriptional repression. Other localization events suppress unwanted recombination. These findings highlight the contribution budding yeast genetics and cytology have made to dissecting the functional role of nuclear structure.

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