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High homology between variant surface glycoprotein gene expression sites of Trypanosoma brucei and Trypanosoma gambiense.

By C Daï Do Thi, Diane Aerts, Maurice Steinert and Etienne Pays


The AnTat 11.17 variant surface glycoprotein (VSG) is synthesized in both metacyclic and bloodstream forms of Trypanosoma gambiense. We have characterized the AnTat 11.17 gene, and analyzed its expression site (ES) in the bloodstream form by Southern and Northern blotting with probes from the Trypanosoma brucei AnTat 1.3A VSG ES, and by run-on transcription. The AnTat 11.17 ES is located at the end of a 700-kb chromosome. It appears to contain all the genes (ESAGs, for Expression Site-Associated Genes) present in the AnTat 1.3A VSG ES, with the possible exception of ESAG 1. Limited nucleotide sequence analysis of ESAG cDNAs from the AnTat 11.17 ES shows considerable conservation with ESAGs of T. brucei. The transcription promoter of the AnTat 11.17 VSG ES, localized by virtue of the specific accumulation of promoter-proximal transcripts which occurs following UV irradiation, was found to be at the same relative position to the first ESAG (ESAG 7) as in AnTat 1.3A.Journal ArticleResearch Support, Non-U.S. Gov'tinfo:eu-repo/semantics/publishe

Topics: Sciences bio-médicales et agricoles, Amino Acid Sequence, Animals, Base Sequence, DNA, Protozoan -- chemistry, Gene Expression, Genes, Molecular Sequence Data, Promoter Regions, Genetic, Restriction Mapping, Sequence Homology, Nucleic Acid, Transcription, Genetic, Trypanosoma brucei brucei -- genetics, Trypanosoma brucei brucei -- radiation effects, Trypanosoma brucei gambiense -- genetics, Trypanosoma brucei gambiense -- radiation effects, Variant Surface Glycoproteins, Trypanosoma -- genetics
Year: 1991
DOI identifier: 10.1016/0166-6851(91)90115-m
OAI identifier:
Provided by: DI-fusion
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