The world's first wiki where authorship really matters (Nature Genetics, 2008). Due credit and reputation for authors. Imagine a global collaborative knowledge base for original thoughts. Search thousands of articles and collaborate with scientists around the globe.

wikigene or wiki gene protein drug chemical gene disease author authorship tracking collaborative publishing evolutionary knowledge reputation system wiki2.0 global collaboration genes proteins drugs chemicals diseases compound
Hoffmann, R. A wiki for the life sciences where authorship matters. Nature Genetics (2008)

Cell differentiation induces TIF1beta association with centromeric heterochromatin via an HP1 interaction.

The transcriptional intermediary factor 1 (TIF1) family protein TIF1beta is a corepressor for Krüppel-associated box (KRAB)-domain-containing zinc finger proteins and plays a critical role in early embryogenesis. Here, we examined TIF1beta distribution in the nucleus of mouse embryonic carcinoma F9 cells during retinoic-acid-induced primitive endodermal differentiation. Using confocal immunofluorescence microscopy, we show that, although TIF1beta is diffusely distributed throughout the nucleoplasm of undifferentiated cells, it relocates and concentrates into distinct foci of centromeric heterochromatin in differentiated cells characterized by a low proliferation rate and a well developed cytokeratin network. This relocation was not observed in isoleucine-deprived cells, which are growth arrested, or in compound RXR alpha(-/-)/RAR gamma(-/-) null mutant cells, which are resistant to RA-induced differentiation. Amino-acid substitutions in the PxVxL motif of TIF1beta, which abolish interaction with members of the heterochromatin protein 1 ( HP1) family, prevent its centromeric localization in differentiated cells. Collectively, these data provide compelling evidence for a dynamic nuclear compartmentalization of TIF1beta that is regulated during cell differentiation through a mechanism that requires HP1 interaction.[1]


  1. Cell differentiation induces TIF1beta association with centromeric heterochromatin via an HP1 interaction. Cammas, F., Oulad-Abdelghani, M., Vonesch, J.L., Huss-Garcia, Y., Chambon, P., Losson, R. J. Cell. Sci. (2002) [Pubmed]
WikiGenes - Universities