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Monoallelic Gene Expression in Malaria Parasites A Key Mechanisms in the Pathog...

Monoallelic Gene Expression in Malaria Parasites A Key Mechanisms in the Pathogen s Survival Strategy An important number of human and animal pathogens use antigenic variation of surface proteins as a mechanism to avoid destruction by the host s immune system. Most escape mechanisms rely on the successive expression of members of... ver más

31/05/2015

2M€

Presupuesto del proyecto: 2M€

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INSTITUT PASTEUR No se ha especificado una descripción o un objeto social para esta compañía.

TRL 4-5

Fecha límite participación Sin fecha límite de participación.

Financiación concedida El organismo FP7 notifico la concesión del proyecto el día 2015-05-31 No tenemos la información de la convocatoria

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Líder del proyecto

INSTITUT PASTEUR No se ha especificado una descripción o un objeto social para esta compañía.

TRL 4-5

Presupuesto del proyecto 2M€

Fecha límite de participación Sin fecha límite de participación.

Descripción del proyecto An important number of human and animal pathogens use antigenic variation of surface proteins as a mechanism to avoid destruction by the host s immune system. Most escape mechanisms rely on the successive expression of members of gene families in a mutually exclusive manner, a biological process which remains elusive at the molecular level. The protozoan pathogen Plasmodium falciparum, which infects up to 300 million people causing more than two million lives each year, undergoes antigenic variation to establish chronic blood stage infection. A critical determinant in chronic infection and pathogenesis is the expression of clonally variant molecules at the surface of infected erythrocytes. Several variant gene families undergo antigenic variation in P. falciparum and are expressed during blood stage infection. One family encoded by 60 var genes expresses the most well-known virulence factor causing severe malaria (capillary blockages in the brain and other organs mediated by infected erythrocytes). Switching expression between the 60-member var gene family avoids immune clearance and prolongs the period of infection and transmission to the mosquito. The initial event controlling mono allelic expression at a unique expression site remains elusive and represents the Holly Graal in the field of phenotypic variation. To this end, the major objective of this proposal is to identify specific factors contributing to active expression sites (proteins, DNA enhancer or ncRNA) by using novel strategies such as Proteomics of Isolated Chromatin segments (PICh) and Chromosome Conformation Capture (3C). We expect that new insights into the underlying principles of gene counting of virulence gene families may reveal an Achilles Heel of the parasite s immune evasion strategy.

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