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Mem Inst Oswaldo Cruz. 1992;87 Suppl 3:85-9.

A chromosome 9 deletion in Plasmodium falciparum results in loss of cytoadherence.

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Walter and Eliza Hall Institute of Medical Research, Royal Melbourne Hospital, Victoria, Australia.


Many lines of Plasmodium falciparum undergo a deletion of the right end of chromosome 9 during in vitro culture accompanied by loss of cytoadherence and gametocytogenesis. Selection of cytoadherent cells from a mixed population co-selects for those with an undeleted chromosome 9 and the selected cells produce gametocytes. The deletion also results in loss of expression of PfEMP1, the putative cytoadherence ligand, suggesting that PfEMP1 or a regulatory gene controlling PfEMP1 expression and gametocytogenesis may be encoded in this region. We have isolated several markers for the deleted region and are currently using a YAC-P. falciparum library to investigate this region of the genome in detail.

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