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Nucleic Acids Research, Vol 25, Issue 15 3017-3026, Copyright © 1997 by Oxford University Press

ARTICLES

Mechanisms of developmental regulation in Trypanosoma brucei: a polypyrimidine tract in the 3'-untranslated region of a surface protein mRNA affects RNA abundance and translation

HR Hotz, C Hartmann, K Huober, M Hug and C Clayton
Zentrum fur Molekulare Biologie, Universitat Heidelberg, Im Neuenheimer Feld 282, D-69120 Heidelberg, Germany.

Salivarian trypanosomes are extracellular parasites of mammals that are transmitted by tsetse flies. The procyclic acidic repetitive proteins (PARPs) are the major surface glycoproteins of the form of Trypanosoma brucei that replicates in the fly. The abundance of PARP mRNA and protein is very strongly regulated, mostly at the post-transcriptional level. The 3'-untranslated regions of two PARP genes are of similar lengths, but are dissimilar in sequence apart from a 16mer stem-loop that stimulates translation and a 26mer polypyrimidine tract. Addition of either of these PARP 3'-untranslated regions immediately downstream of a reporter gene resulted in developmental regulation mimicking that of PARP. We show that the PARP 3'-UTR reduces RNA stability and translation in bloodstream forms and that the 26mer polypyrimidine tract is necessary for both effects.
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