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The Role of the Histone Methyltransferase PfSET10 in Antigenic Variation by Malaria Parasites: a Cautionary Tale

February 9, 2021 - 09:57 -- Open Access
Ngwa CJ, Gross MR, Musabyimana JP, Pradel G, Deitsch KW
mSphere. 2021 Feb 3;6(1):e01217-20

The virulence of the malaria parasite Plasmodium falciparum is due in large part to its ability to avoid immune destruction through antigenic variation. This results from changes in expression within the multicopy var gene family that encodes the surface antigen P. falciparum erythrocyte protein one (PfEMP1). Understanding the mechanisms underlying this process has been a high-profile research focus for many years. The histone methyltransferase PfSET10 was previously identified as a key enzyme required both for parasite viability and for regulating var gene expression, thus making it a prominent target for developing antimalarial intervention strategies and the subject of considerable research focus. Here, however, we show that disruption of the gene encoding PfSET10 is not lethal and has no effect on var gene expression, in sharp contrast with previously published reports. The contradictory findings highlight the importance of reevaluating previous conclusions when new technologies become available and suggest the possibility of a previously unappreciated plasticity in epigenetic gene regulation in P. falciparum.

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