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A Specific PfEMP1 Is Expressed in P. falciparum Sporozoites and Plays a Role in Hepatocyte Infection

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  • Gigliola Zanghì
  • Shruthi S Vembar
  • Sebastian Baumgarten
  • Shuai Ding
  • Julien Guizetti
  • Jessica M Bryant
  • Denise Mattei
  • Anja T R Jensen
  • Laurent Rénia
  • Yun Shan Goh
  • Robert Sauerwein
  • Cornelus C Hermsen
  • Jean-François Franetich
  • Mallaury Bordessoulles
  • Olivier Silvie
  • Valérie Soulard
  • Olivier Scatton
  • Patty Chen
  • Salah Mecheri
  • Dominique Mazier
  • Artur Scherf
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Heterochromatin plays a central role in the process of immune evasion, pathogenesis, and transmission of the malaria parasite Plasmodium falciparum during blood stage infection. Here, we use ChIP sequencing to demonstrate that sporozoites from mosquito salivary glands expand heterochromatin at subtelomeric regions to silence blood-stage-specific genes. Our data also revealed that heterochromatin enrichment is predictive of the transcription status of clonally variant genes members that mediate cytoadhesion in blood stage parasites. A specific member (here called NF54varsporo) of the var gene family remains euchromatic, and the resultant PfEMP1 (NF54_SpzPfEMP1) is expressed at the sporozoite surface. NF54_SpzPfEMP1-specific antibodies efficiently block hepatocyte infection in a strain-specific manner. Furthermore, human volunteers immunized with infective sporozoites developed antibodies against NF54_SpzPfEMP1. Overall, we show that the epigenetic signature of var genes is reset in mosquito stages. Moreover, the identification of a strain-specific sporozoite PfEMP1 is highly relevant for vaccine design based on sporozoites.

Original languageEnglish
JournalCell Reports
Volume22
Issue number11
Pages (from-to)2951-2963
Number of pages13
DOIs
Publication statusPublished - 13 Mar 2018

ID: 56467130