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• W1993765638 abstract "Cell differentiation is a multi-step process marked by progressive silencing of gene expression through mechanisms believed to involve heterochromatin. We have previously shown that interaction between the Krüppel associated box-containing zinc finger proteins (KRAB-ZFP) corepressor TIF1β and the heterochromatin proteins HP1 is essential for progression through differentiation of embryonal carcinoma F9 cells. This analysis clearly demonstrated the link between gene specific repressors, components of heterochromatin and cell differentiation. In mammals, there are three HP1 isotypes, HP1α, β, and γ, that appear to be involved in both eu- and heterochromatin, but whose individual functions are still poorly defined. Therefore, the aim of the present study was to determine in vivo (i) which HP1 isotypes interact with TIF1β, (ii) in which sub-nuclear compartments these interactions occur and (iii) whether these interactions are regulated during cell differentiation. To address these questions, we established stable F9 cell lines co-expressing TIF1β fused to the ECFP fluorophore and HP1α, β, or γ fused to the EYFP fluorophore. Using the Föster resonance energy transfer (FRET) technology, we map the physical interaction between TIF1β-CFP and the different HP1-YFP isotypes in living F9 cells. We demonstrate that in non-differentiated cells, TIF1β-CFP/HP1-YFP interaction occurs only within euchromatin and involves selectively HP1β-YFP and HP1γ-YFP, but not HP1α-YFP. Furthermore, in differentiated cells, TIF1β-CFP selectively associates with HP1β-YFP within heterochromatin, while TIF1β-CFP/HP1γ-YFP is exclusively present within euchromatin. No physical TIF1β-CFP/HP1α-YFP interaction is detected in neither non differentiated nor differentiated cells. These results support the notion that, in vivo, HP1 isotypes have specific nonredundant functions and provide evidence for HP1β playing an essential role in the shuttling of TIF1β from eu- to heterochromatin during cell differentiation." @default.
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• W1993765638 date "2007-09-01" @default.
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• W1993765638 title "Dynamic and selective interactions of the transcriptional corepressor TIF1β with the heterochromatin protein HP1 isotypes during cell differentiation" @default.
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• W1993765638 doi "https://doi.org/10.1111/j.1432-0436.2007.00166.x" @default.
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