Nucleic Acids Research, 1989, Vol. 17, No. 21 8727-8739
© 1989
MOLECULAR BIOLOGY |
Duplication and transcription of procyclin genes in Trypanosoma brucei
Kernforschungszentrum Karlsruhe, Institut für Genetik und Toxikologie Postfach 3640, D-7500 Karlsruhe 1, UK 1Deutsches Krebsforschungszentrum, Institut för Virusforschung Heidelberg, FRG, UK 2Department of Biochemistry, University of Cambridge Cambridge, UK
*To whom correspondence should be addressed
Received September 4, 1989. Accepted October 29, 1989.
The genes encoding procyclin, the major glycoprotein expressed on the surface of procyclic forms of Trypanosoma brucei, comprise a multigene family. It has previously been demonstrated that procyclin genes in cloned trypanosome strains from Kenya and Uganda show restriction fragment polymorphisms. A detailed study of the Kenyan strain 227 has revealed that procyclin genes are arranged in tandem at 3 distinct loci (Pro A, B and C and that the polymorphism is due to the duplication of 1.3 kb in the Pro A locus, which has generated an additional procyclin gene. Northern blot analysis has shown that at least 2 loci are transcribed and that a minimum of 3 procyclin genes are expressed within a cloned line. The transcription of procyclin genes is resistant to 1mg ml1
-amanitin, whereas that of the 5' flanking gene in the Pro A locus is sensitive. This observation suggests that the two genes form part of separate transcription units with a promoter between them.
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