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XPRESS

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Exploring mechanisms of gene repression and escape during X chromosome inactivat...

Exploring mechanisms of gene repression and escape during X chromosome inactivation During mammalian development, precise gene expression patterns have to be established and then maintained, or reversed, in different cellular and tissue contexts. A striking example of such developmentally regulated gene control i... ver más

30/04/2021

EMBL

2M€

Presupuesto del proyecto: 2M€

Líder del proyecto

EUROPEAN MOLECULAR BIOLOGY LABORATORY No se ha especificado una descripción o un objeto social para esta compañía.

Fecha límite participación Sin fecha límite de participación.

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Financiación concedida El organismo H2020 notifico la concesión del proyecto el día 2021-04-30

ERC-ADG-2014: ERC Advanced Grant

I+D

Cerrada hace 10 años

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4 Participantes

EMBL

477.47K€ | Lider

TRATAMIENTOS TERMICOS CARRER...

340.00K€ | Participante

COLLEGE DE FRANCE

262.99K€ | Participante

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Duración del proyecto: 67 meses Fecha Inicio: 2015-09-23
Fecha Fin: 2021-04-30

Líder del proyecto

EUROPEAN MOLECULAR BIOLOGY LABORATORY No se ha especificado una descripción o un objeto social para esta compañía.

Presupuesto del proyecto 2M€

Fecha límite de participación Sin fecha límite de participación.

Descripción del proyecto During mammalian development, precise gene expression patterns have to be established and then maintained, or reversed, in different cellular and tissue contexts. A striking example of such developmentally regulated gene control is X-chromosome inactivation (XCI), whereby one of the two X chromosomes in females is silenced during embryogenesis. XCI is initiated by the non-coding Xist RNA, which coats the chromosome in cis, triggering gene repression, chromatin changes and chromosomal reorganisation. Although Xist’s regulation has been investigated intensively, less is known about the actual mechanisms underlying the process of chromosome-wide gene silencing that it induces. Indeed, X-linked loci show very different kinetics of repression during development, implying regional and/or locus specific diversity. Furthermore, some genes avoid or escape XCI altogether, either constitutively or in a tissue or stage-specific fashion, but the molecular basis for this is unclear. Here we propose to dissect the mechanisms underlying gene regulation during XCI. We will investigate the roles of recently identified Xist partners in gene silencing and perform genetic screens to identify new factors involved in silencing and escape from XCI. Transcription, chromatin status and chromosome conformation during XCI will be investigated in an allelic-specific manner during precise developmental time windows to pinpoint the critical changes accompanying silencing and escape. We will use genetic engineering to alter genomic and epigenomic landscapes of selected loci and target candidate trans-acting factors to their putative regulatory elements. Finally, we will develop tools to explore gene expression during XCI using live cell imaging of embryogenesis. Using this innovative set of approaches, we hope to define both general principles underlying gene silencing and escape in XCI, as well as locus-specific features that could serve as new paradigms for research in developmental epigenetics.

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