Abstract
Malaria parasites, unlike other eukaryotes, have developmentally controlled distinct small subunit ribosomal RNA (SSUrRNA)-encoding genes (SSUrDNA), sporozoite stage-specific C and blood stage-specific A genes. This report describes characterization of the C and A forms of SSUrDNA from the human malaria parasite Plasmodium vivax. We have aligned and compared these sequences with the reported SSUrDNA sequences of other human malaria parasites to identify the regions with potential for diagnostic probes. The comparison revealed the presence of seven conserved regions (> or = 90% similarity), four highly variable regions (< 60% similarity) and three semiconserved regions. The analysis also revealed that the A and C genes of P. vivax share more similarity with each other, as compared to the A and C genes of P. falciparum. Comparison of the SSUrDNA of human, monkey and rodent malaria parasites revealed that the A genes share more similarity with each other than the C genes share with each other.
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