Malaria Genetics & Genomics African tree rats are closely related to field mice, and the laboratory rat and mouse. Their natural habitat is the gallery forests found lining streams and rivers, where they build nests of leaves at heights of 2 to 3 m above ground. Colonies of thicket rats have been introduced into the laboratory for use in parasitological studies, with limited sucess due to their poor breeding performance under laboratory conditions.
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   Plasmodium berghei

P. berghei was first isolated from the blood of a thicket rat in Katanga (now Zaire) Africa, by I. H. Vinke in 1948. The parasite is readily grown in laboratory mice and rats, where it shows a preference for reticolocytes (Blood smear of P. berghei). Infections are asynchronous with a periodicity of 22-25 hours. The parasite may be transmitted in the laboratory by Anopheles stephensi mosquitoes, but is extremely sensitive to temperatures outside the range 19-21oC.

Very few genetically distinct isolates of P. berghei are available (WHO Rodent Malaria List) making this species the least valuable for genetic crossing work.

o The P. berghei genome

P. berghei, like all other species of malaria parasite studied so far, has 14 chromosomes which can be separated by pulsed-field gel electrophoresis. Genome size is estimated to be close to that of P. falciparum at 25-30 Mb. The genome is extremely A/T rich at approximately 80% A/T, comparable to that of P. falciparum.

o University of Florida EST and GSS Project

The University of Florida have initiated a gene sequence tag project of P. berghei to complement an ongoing gene sequence tag project in P. vivax (http://parasite.vetmed.ufl.edu). The aim is to tag 10,000 genes in the genome of P. berghei and to assign putative identities to each gene where possible.

Last updated: Dec 1, 2000

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