CHROMO-ANCHORING

Functional organization of heterochromatin at the nuclear periphery in cell differentiation

Coordinatore	FRIEDRICH MIESCHER INSTITUTE FOR BIOMEDICAL RESEARCH    more  Organization address address: MAULBEERSTRASSE 66 city: BASEL postcode: 4058 contact info Titolo: Mrs. Nome: Dorothy Cognome: Searles Email: send email Telefono: +41 616972982
Nazionalità Coordinatore	Switzerland [CH]
Totale costo	199˙317 €
EC contributo	199˙317 €
Programma	FP7-PEOPLE Specific programme "People" implementing the Seventh Framework Programme of the European Community for research, technological development and demonstration activities (2007 to 2013)
Code Call	FP7-PEOPLE-2013-IEF
Funding Scheme	MC-IEF
Anno di inizio	2015
Periodo (anno-mese-giorno)	2015-01-01   -   2016-12-31

 Partecipanti

#	participant	country	role	EC contrib. [€]
1	FRIEDRICH MIESCHER INSTITUTE FOR BIOMEDICAL RESEARCH  Organization address address: MAULBEERSTRASSE 66 city: BASEL postcode: 4058 contact info Titolo: Mrs. Nome: Dorothy Cognome: Searles Email: send email Telefono: +41 616972982	CH (BASEL)	coordinator	199˙317.60

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 Obiettivo del progetto (Objective)

'Co-ordinating the patterns of gene expression that drive the development of a complex organism requires multiple layers of regulation, extending from sequence-based DNA-protein interactions to higher-order architecture of the genome. The spatial organization of chromatin within the nucleus is thought to reflect a functional compartmentalization that mirrors changes in cell fate. Recently, the signals and proteins involved in the topological organization of heterochromatin in complex organisms started to be addressed. In C. elegans, cell differentiation is accompanied by a cell-type specific 3D re-organization of the nucleus, leading to the internal localization of active tissue-specific promoters and the perinuclear sequestration of repressed tissue-specific promoters. Through a highly successful genome-wide RNAi screen the Gasser laboratory identified histone H3K9 methylation as an essential signal for the peripheral anchoring of heterochromatin in undifferentiated embryonic C. elegans cells. However, as embryos differentiate into worms the perinuclear sequestration of heterochromatic arrays is re-established, even in absence of H3K9 methylation. This strongly argues that alternative, unknown anchoring pathways that are induced during differentiation exist and orchestrate heterochromatin spatial segregation. With this project, I aim to identify the chromatin signals and “reader” molecules triggering heterochromatin anchoring at the nuclear periphery in differentiating worm cells. Moreover, I will determine whether compartmentalization of chromatin is required for appropriate cell-type differentiation. I predict that defects in tissue maintenance will arise, albeit possibly subtle ones, when chromatin fails to segregate into active and inactive domains. Overall, this project will significantly contribute to understanding how genomic nuclear organization impinges on epigenetic regulation.'