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Heterochromatin-dependent gene silencing is central to the adaptation and survival of Plasmodium falciparum malaria parasites, allowing clonally variant gene expression during blood infection in humans. By assessing genome-wide heterochromatin protein 1 (HP1) occupancy, we present a comprehensive analysis of heterochromatin landscapes across different Plasmodium species, strains, and life cycle stages. Common targets of epigenetic silencing include fast-evolving multi-gene families encoding surface antigens and a small set of conserved HP1-associated genes with regulatory potential. Many P. falciparum heterochromatic genes are marked in a strain-specific manner, increasing the parasite's adaptive capacity. Whereas heterochromatin is strictly maintained during mitotic proliferation of asexual blood stage parasites, substantial heterochromatin reorganization occurs in differentiating gametocytes and appears crucial for the activation of key gametocyte-specific genes and adaptation of erythrocyte remodeling machinery. Collectively, these findings provide a catalog of heterochromatic genes and reveal conserved and specialized features of epigenetic control across the genus Plasmodium.

Original publication

DOI

10.1016/j.chom.2018.01.008

Type

Journal article

Journal

Cell Host Microbe

Publication Date

14/03/2018

Volume

23

Pages

407 - 420.e8

Keywords

HP1, Plasmodium, antigenic variation, epigenetics, gametocytes, gene silencing, heterochromatin, host-parasite interaction, malaria, sexual differentiation, Adaptation, Physiological, Animals, Antigenic Variation, Antigens, Protozoan, Cell Proliferation, Chromosomal Proteins, Non-Histone, Disease Models, Animal, Epigenesis, Genetic, Epigenomics, Female, Gene Expression Profiling, Gene Expression Regulation, Gene Silencing, Heterochromatin, Host-Parasite Interactions, Humans, Life Cycle Stages, Malaria, Falciparum, Mice, Mice, Inbred BALB C, Parasites, Phylogeny, Plasmodium, Plasmodium falciparum, Protozoan Proteins, Sex Differentiation