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Epigenetically-regulated RNA-binding proteins signify malaria hypnozoite dormancy

ABSTRACT: This SuperSeries is composed of the SubSeries listed below.

ORGANISM(S): Mus musculus Plasmodium cynomolgi

PROVIDER: GSE180258 | GEO | 2024/01/24

REPOSITORIES: GEO

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Epigenetically-regulated RNA-binding proteins signify malaria hypnozoite dormancy [ChIP-seq]

Project description:Dormancy enables pathogens to survive unfavorable conditions and maximize their chance for transmission. Relapsing malaria parasites, such as Plasmodium vivax, ovale and cynomolgi employ this strategy. After inoculation by the bite of an infected mosquito, the so-called hypnozoites stay quiescent inside liver cells before reactivating, proliferating and establishing blood stage infection. Despite recent advances in molecular characterization of hypnozoites the mechanisms leading to hypnozoite formation and reactivation remain a mystery. Here we integrate various omics approaches to explore the involvement of gene regulatory mechanisms in these processes. By profiling the genome-wide distribution of repressive and activating epigenetic marks we identify a small set of genes that gets epigenetically silenced during liver stage development, a process that is conserved amongst relapsing parasites. Furthermore, by combining single-cell transcriptomics, chromatin accessibility profiling and fluorescent in situ RNA hybridization we show that these genes are expressed in hypnozoites and their silencing coincides with parasite development. Intriguingly, genes with clear hypnozoite-specific expression are almost exclusively encoding for proteins with RNA-binding domains. Overall, these findings support a model in which repressive RNA-binding proteins keep hypnozoites in a developmentally competent, but dormant state and heterochromatin-mediated silencing of these genes enables hypnozoite reactivation. Further testing of this hypothesis could provide decisive clues for targeted reactivation and killing of these vicious pathogens.

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