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Epigenome establishment and maintenance of the inactive X chromosome in response...

Epigenome establishment and maintenance of the inactive X chromosome in response to DNA double-strand breaks in mammalian cells The DNA damage response takes place on a chromatin substrate and triggers profound chromatin alterations. Chromatin states vary substantially between genomic regions, driving distinct gene expression profiles and also different DN... ver más

31/12/2025

CNRS

212K€

Presupuesto del proyecto: 212K€

Líder del proyecto

CENTRE NATIONAL DE LA RECHERCHE SCIENTIFIQUE... No se ha especificado una descripción o un objeto social para esta compañía.

TRL 4-5

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Financiación concedida El organismo HORIZON EUROPE notifico la concesión del proyecto el día 2023-08-03

HORIZON-MSCA-2022-PF-01-01: MSCA Postdoctoral Fellowships 2022 ExpectedOutcome:

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2 Participantes

CNRS

211.75K€ | Lider

UPCité

N.D. | Participante

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Duración del proyecto: 28 meses Fecha Inicio: 2023-08-03
Fecha Fin: 2025-12-31

Líder del proyecto

CENTRE NATIONAL DE LA RECHERCHE SCIENTIFIQUE... No se ha especificado una descripción o un objeto social para esta compañía.

TRL 4-5

Presupuesto del proyecto 212K€

Descripción del proyecto The DNA damage response takes place on a chromatin substrate and triggers profound chromatin alterations. Chromatin states vary substantially between genomic regions, driving distinct gene expression profiles and also different DNA damage repair responses. One striking example is the heterochromatinization of an entire chromosome, the inactive X chromosome in female mammals, that is silenced during embryonic development by facultative heterochromatin formation. How the facultative heterochromatin state of the inactive X responds to DNA damage and impacts DNA repair is poorly understood. My research project aims at identifying chromatin changes that accompany the repair of the most cytotoxic form of DNA damage, DNA double-strand breaks (DSBs), in facultative heterochromatin and the mechanisms that ensure the establishment and maintenance of the inactive X chromosome in response to DNA damage in mammalian cells. To generate DSBs, I use the CRISPR/Cas9 technology that allows sequence-specific targeting of the Cas9 nuclease. Thanks to available bioinformatic tools, I can discriminate between active and inactive X chromosomes, analyze the genomic instability profiles induced around the break sites and decipher the repair pathway involved. In parallel, I will profile the chromatin marks associated with the inactive X chromosome in the vicinity of DSBs to assess the impact of DNA damage and repair on heterochromatin maintenance. Moreover, I will test the hypothesis that the high level of replicative stress-induced breaks in embryonic stem cells could drive heterochromatin establishment and thus skew the choice of the inactive X chromosome. For this, I will study the impact of generating DSBs on one X chromosome of mouse stem cells on their differentiation potential and their propension to inactivate the damaged X chromosome. Together, this work should shed light on the interplay between the DSB response and facultative heterochromatin states.

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