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• W2912787004 abstract "The Plasmodium falciparum var gene family encodes ∼60 surface antigens by which parasites escape the host immune responses via clonal expression of var genes. However, the mechanism controlling this mutual exclusivity, associated with alterations in chromatin assembly, is not understood. Here, we determined how expression of the var gene family is regulated by two RecQ DNA helicase family members, PfRecQ1 and PfWRN, in P. falciparum Through genetic manipulation, we found that the complete var repertoire was silenced on PfRecQ1 knockout, whereas their expression did not show noticeable changes when PfWRN was knocked out. More important, mutually exclusive expression of var genes could be rescued by complementation of PfRecQ1. In addition, knocking out either of these two helicase genes changed the perinuclear cluster distribution of subtelomeres and subtelomeric var genes. Whereas deletion of PfRecQ1 increased the heterochromatin mark trimethylated (H3K9me3) at the transcription start site (TSS) of the var gene upsC1, that deletion had no effect on the global distribution of H3K9me3 over gene bodies, including those for the var genes. ChIP-seq assay showed that PfRecQ1 was enriched globally at the TSSs of all genes, whereas PfWRN-enriched regions occurred at the gene bodies of the var gene family, but not of other genes or at TSSs of all genes. On PfRecQ1 deletion, the upsC1 var gene moved from the active perinuclear transcription region to a silenced region of the upsC type. These findings imply that PfRecQ1, but not PfWRN, is essential for maintaining the clonal expression of var genes." @default.
• W2912787004 created "2019-02-21" @default.
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• W2912787004 date "2019-02-06" @default.
• W2912787004 modified "2023-10-05" @default.
• W2912787004 title "DNA helicase RecQ1 regulates mutually exclusive expression of virulence genes in <i>Plasmodium falciparum</i> via heterochromatin alteration" @default.
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• W2912787004 doi "https://doi.org/10.1073/pnas.1811766116" @default.
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