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We have adapted the "directional tag subtractive hybridization" technique as a means of investigating stage-specific gene expression in Plasmodium falciparum. This technique utilizes unidirectional cDNA libraries cloned into separate lambda vectors and involves hydroxyapatite chromatographic separation of target antisense cDNA and driver sense strand cRNA followed by PCR amplification of cDNA sequences specific to the target stage. This technique enabled efficient subtraction of asexual blood stage sequences from a P. falciparum sporozoite cDNA library and led to identification of novel sporozoite sequences. This technique can be applied to study gene expression in parasite stages that are difficult to obtain routinely.

Original publication




Journal article


Exp Parasitol

Publication Date





220 - 225


Animals, Anopheles, DNA, Complementary, DNA, Protozoan, Gene Expression Regulation, Gene Library, Nucleic Acid Hybridization, Plasmodium falciparum, Polymerase Chain Reaction