Trypanosoma brucei brucei has two distinct developmental stages, the procyclic stage in the insect and the bloodstream stage in the mammalian host. The significance of each developmental stage is punctuated by specific changes in metabolism. In the insect, T. b. brucei is strictly dependent on mitochondrial function and thus respiration to generate the bulk of its ATP, whereas in the mammalian host it relies heavily on glycolysis. These observations have raised questions about the importance of mitochondrial function in the bloodstream stage. Peculiarly, akinetoplastic strains of Trypanosoma brucei evansi that lack mitochondrial DNA do exist in the wild and are developmentally locked in the glycolysis-dependent bloodstream stage. Using RNAi we show that two mitochondrion-imported proteins, mitochondrial RNA polymerase and guide RNA associated protein 1, are still imported into the nucleic acids-lacking organelle of T. b. evansi, making the need for these proteins futile. We also show that, like in the T. b. brucei procyclic stage, the mitochondria of both bloodstream stage of T. b. brucei and T. b. evansi import various tRNAs, including those that undergo thiolation. However, we were unable to detect mitochondrial thiolation in the akinetoplastic organelle. Taken together, these data suggest a lack of connection between nuclear and mitochondrial communication in strains of T. b. evansi that lost mitochondrial genome and that do not required an insect vector for survival.

• MeSH
• adenosintrifosfát metabolismus   MeSH
• buněčné jádro genetika   metabolismus   MeSH
• DNA řízené RNA-polymerasy genetika   metabolismus   MeSH
• geneticky modifikované organismy MeSH
• glykolýza fyziologie   MeSH
• guide RNA, Kinetoplastida metabolismus   MeSH
• kinetoplastová DNA metabolismus   MeSH
• mezibuněčná komunikace MeSH
• mitochondrie genetika   metabolismus   MeSH
• oxidativní fosforylace MeSH
• proteiny genetika   metabolismus   MeSH
• RNA interference MeSH
• RNA transferová genetika   metabolismus   MeSH
• transport proteinů MeSH
• transport RNA MeSH
• Trypanosoma fyziologie   MeSH
• trypanozomiáza parazitologie   MeSH
• Publikační typ
• časopisecké články MeSH
• práce podpořená grantem MeSH
• Research Support, N.I.H., Extramural MeSH