( Multiple-genotype infections are increa...)Fluorescent markers to distinguish Trypanosoma brucei strains causing Sleeping Sickness,Health

Multiple-genotype infections are increasingly recognized as important factors in disease evolution, parasite transmission dynamics, and the evolution of drug resistance. However, the distinction of co-infecting site genotypes and the tracking of their dynamics have been // ficult with traditional methods based on various genotyping techniques, leaving most questions unaddressed.

Trypanosoma brucei , a protozoan parasite transmitted by the bite of the tsetse fly (Glossina spp.), is of great medical and economic interest in Africa. It causes human sleeping sickness, and Nagana, a cattle disease that prevents cattle farming and the use of work animals over huge areas of sub-Saharan Africa, thus profoundly affecting the economics of the entire continent.

A recent study, to be published in Acta Tropica (available online 4 October 2005) reports new fluorescence markers of various colours that are inserted into the genome of T. brucei to phenotypically label live parasites of all life cycle stages. If different parasite strains are labelled with different colours they can be easily distinguished from each other in experimental studies.

For the study, a total of 10 T. brucei strains were successfully transfected with different fluorescence markers and were monitored in culture, tsetse flies and mice, to demonstrate stability of marker _expression.

The use of fluorescence activated cell sorting (FACS) allowed rapid and accurate identification of parasite strains labelled with different markers. Cell counts by FACS were virtually identical to counts by traditional microscopy but were considerably faster and had a significantly lower sampling error . Co-infecting strains transfected with fluorescence genes of different colour were easily distinguished by eye and their relative and absolute densities were reliably counted by FACS in experimental multiple infections in mice.

Since the FACS can simultaneously determine th
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