The role of transferrin-receptor variation in the host range of Trypanosoma brucei

W. Bitter, H. Gerrits, R. Kieft and P. Borst
Additional contact information
W. Bitter: Utrecht University
H. Gerrits: The Netherlands Cancer Institute
R. Kieft: The Netherlands Cancer Institute
P. Borst: The Netherlands Cancer Institute

Nature, 1998, vol. 391, issue 6666, 499-502

Abstract: Abstract Trypanosoma brucei1 is a unicellular parasite transmitted between African mammals by tsetse flies. T. brucei multiplies freely in the bloodstream of many different mammals, and survives by antigenic variation of the main component of its surface coat, variant surface glycoprotein (VSG)2,3. Trypanosomes take up transferrin through a heterodimeric transferrin receptor4,5,6,7,8,9, the genes for which are expressed in telomeric expression sites along with the VSG gene. There are up to 20 of these expression sites per trypanosome nucleus3,10,11,12,13,14,15, but usually only one is active at a time. Different expression sites encode transferrin receptors that are similar but not identical16. Here we show that these small differences between transferrin receptors can have profound effects on the binding affinity for transferrins from different mammals, and on the ability of trypanosomes to grow in the sera of these mammals. Our results suggest that the ability to switch between different transferrin-receptor genes allows T.brucei to cope with the large sequence diversity in the transferrins of its hosts17.

Date: 1998
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DOI: 10.1038/35166

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