Abstract:
:Cytoadhesion of infected red blood cells (iRBC) is mediated through parasite-encoded, clonally variant surface antigens (VSA) and is a central process in the pathogenesis of Plasmodium falciparum malaria. Pregnancy-associated malaria (PAM) has been linked to VSA-mediated adhesion of iRBC to the glycosaminoglycan chondroitin sulphate A (CSA) in the placental intervillous space. Several studies have pointed to members of the PfEMP1 VSA family as mediators of CSA-specific iRBC sequestration in the placenta. Here, we report marked upregulation of a single var gene in several P. falciparum parasite isolates after selection for adhesion to CSA in vitro. The gene belongs to a highly conserved and common var gene subfamily (var2csa). The var2csa genes are structurally distinct from all other var genes in the parasite genome in lacking both CIDR and DBL-gamma domains. These domains have previously been implicated in PfEMP1-mediated adhesion to CD36 and CSA. We also show that var2csa was transcribed at higher levels in three placental parasite isolates compared with transcription in parasites from peripheral blood of two children with P. falciparum malaria. This var gene thus has the properties expected of a gene encoding the parasite adhesion molecule that initiates the pathology associated with PAM.
journal_name
Mol Microbioljournal_title
Molecular microbiologyauthors
Salanti A,Staalsoe T,Lavstsen T,Jensen AT,Sowa MP,Arnot DE,Hviid L,Theander TGdoi
10.1046/j.1365-2958.2003.03570.xsubject
Has Abstractpub_date
2003-07-01 00:00:00pages
179-91issue
1eissn
0950-382Xissn
1365-2958pii
3570journal_volume
49pub_type
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