2001
RNA interference in Trypanosoma brucei: cloning of small interfering RNAs provides evidence for retroposon-derived 24-26-nucleotide RNAs.
Djikeng A, Shi H, Tschudi C, Ullu E. RNA interference in Trypanosoma brucei: cloning of small interfering RNAs provides evidence for retroposon-derived 24-26-nucleotide RNAs. RNA 2001, 7: 1522-30. PMID: 11720282, PMCID: PMC1370195.Peer-Reviewed Original ResearchConceptsDouble-stranded RNARNA interferenceGene-specific double-stranded RNAHigh-speed pellet fractionStrand-specific probesSmall interfering RNAsTarget RNA degradationDsRNA resultsHousekeeping functionsTrypanosoma bruceiRNA degradationCellular RNAInterfering RNAsNorthern hybridizationWeight complexesSequence analysisHigh-speed pelletRNALong fragmentSiRNAsPellet fractionEnrichment strategyCloningSupernatant fractionFragments
2000
Cotranscriptional Cap 4 Formation on the Trypanosoma brucei Spliced Leader RNA*
Mair G, Ullu E, Tschudi C. Cotranscriptional Cap 4 Formation on the Trypanosoma brucei Spliced Leader RNA*. Journal Of Biological Chemistry 2000, 275: 28994-28999. PMID: 10880518, DOI: 10.1074/jbc.m004193200.Peer-Reviewed Original ResearchConceptsCap 4 structureSL RNAMRNA cap formationT. brucei cellsSpliced leader RNARNA cap structureSpliced leader sequenceTranscriptional arrestTrypanosomatid protozoaBrucei cellsLeader RNACap 4Cotranscriptional mechanismLeader sequenceTrypanosoma bruceiCap structureRNA transcriptsRibonucleoprotein formationAdenosine residuesPosition 117RNATranscriptsCap formationNucleotidesEukaryotesGenetic interference in Trypanosoma brucei by heritable and inducible double-stranded RNA.
Shi H, Djikeng A, Mark T, Wirtz E, Tschudi C, Ullu E. Genetic interference in Trypanosoma brucei by heritable and inducible double-stranded RNA. RNA 2000, 6: 1069-76. PMID: 10917601, PMCID: PMC1369981, DOI: 10.1017/s1355838200000297.Peer-Reviewed Original ResearchMeSH KeywordsActinsAnimalsDNA-Directed RNA PolymerasesDose-Response Relationship, DrugDown-RegulationElectroporationGene ExpressionGenetic EngineeringPhenotypePlasmidsPromoter Regions, GeneticProtein Synthesis InhibitorsProteinsRNA, Double-StrandedTetracyclineTime FactorsTransfectionTrypanosoma brucei bruceiTubulinViral ProteinsConceptsDouble-stranded RNARNA interferenceGenetic interferenceExpression of dsRNAActin mRNAT7 RNA polymerase systemRNA polymerase systemSpecific mRNA degradationStem-loop structureStable cell linesTetracycline-inducible promoterRNAi responseMolecular dissectionMRNA degradationInducible fashionPolymerase systemCellular divisionGene expressionTransfection efficiencyTransient interferenceCell generationCell linesRNAOrganismsInterference
1996
Trans -splicing in trypanosotnatid protozoa
Ullu E, Tschudi C, Gunzl A. Trans -splicing in trypanosotnatid protozoa. 1996, 115-133. DOI: 10.1093/oso/9780199636020.003.0007.Peer-Reviewed Original ResearchTrans splicingSplice siteT. brucei cellsPolycistronic pre-mRNARNA processing reactionsEnd of transcriptsDifferent variant surface glycoproteinsSeparate RNA moleculesVariant surface glycoproteinSL RNAList of organismsSmall RNAsBrucei cellsSL sequenceTrypanosomatid protozoaMature mRNALeader RNAMature speciesPre-mRNATrypanosoma bruceiRNA moleculesProcessing reactionsRNASurface glycoproteinFirst evidence
1995
Accurate Modification of the Trypanosome Spliced Leader Cap Structure in a Homologous Cell-free System (∗)
Ullu E, Tschudi C. Accurate Modification of the Trypanosome Spliced Leader Cap Structure in a Homologous Cell-free System (∗). Journal Of Biological Chemistry 1995, 270: 20365-20369. PMID: 7657609, DOI: 10.1074/jbc.270.35.20365.Peer-Reviewed Original ResearchConceptsSL RNACap structureCell-free systemRibonucleoprotein particleUnusual cap structureSpliced leader sequenceTrans-splicing activityHomologous cell-free systemRNA maturationTrypanosomatid protozoaNucleotide compositionC. fasciculataLeader sequenceTrypanosoma bruceiCell-free extractsT. bruceiT. cruziRNANucleotides 7Vitro reactionBruceiTwo-dimensional thin-layer chromatographyL. amazonensisLeishmania amazonensisCrithidia
1993
Temporal order of RNA-processing reactions in trypanosomes: rapid trans splicing precedes polyadenylation of newly synthesized tubulin transcripts.
Ullu E, Matthews K, Tschudi C. Temporal order of RNA-processing reactions in trypanosomes: rapid trans splicing precedes polyadenylation of newly synthesized tubulin transcripts. Molecular And Cellular Biology 1993, 13: 720-725. PMID: 8417363, PMCID: PMC358950, DOI: 10.1128/mcb.13.1.720.Peer-Reviewed Original ResearchConceptsRNA-processing reactionsTrans splicingPre-mRNASplice sitePolycistronic transcription unitsSplice acceptor siteTrypanosome genesMRNA biogenesisTranscription unitTrypanosome mRNAsLeader RNATubulin transcriptsSplicingAlpha-tubulinPolyadenylationMRNA synthesisAcceptor sitesTrypanosomesTemporal orderMRNABiogenesisGenesTranscriptsRNAOrganisms
1991
Trans splicing in trypanosomes requires methylation of the 5' end of the spliced leader RNA.
Ullu E, Tschudi C. Trans splicing in trypanosomes requires methylation of the 5' end of the spliced leader RNA. Proceedings Of The National Academy Of Sciences Of The United States Of America 1991, 88: 10074-10078. PMID: 1719544, PMCID: PMC52870, DOI: 10.1073/pnas.88.22.10074.Peer-Reviewed Original Research
1990
Permeable trypanosome cells as a model system for transceiption and trans-splicing
Ullu E, Tschudi C. Permeable trypanosome cells as a model system for transceiption and trans-splicing. Nucleic Acids Research 1990, 18: 3319-3326. PMID: 2356121, PMCID: PMC330939, DOI: 10.1093/nar/18.11.3319.Peer-Reviewed Original ResearchConceptsAlpha-tubulin RNASL RNAFree linear moleculesHigh molecular weight RNAMolecular weight RNARNA speciesLeader RNATrypanosome cellsDifferent genesWeight RNARNATranscriptionModel systemCritical rolePermeable cellsConcentrations of monovalentIntronsCellsGenesLesser extentHigh potassium concentrationSpeciesTrypanosomaMgCl2 concentrationLinear moleculesDestruction of U2, U4, or U6 small nuclear RNA blocks Trans splicing in trypanosome cells
Tschudi C, Ullu E. Destruction of U2, U4, or U6 small nuclear RNA blocks Trans splicing in trypanosome cells. Cell 1990, 61: 459-466. PMID: 1692263, DOI: 10.1016/0092-8674(90)90527-l.Peer-Reviewed Original ResearchConceptsTrans splicingU snRNAsPre-mRNAU6 small nuclear RNAU4/U6 snRNPsAlpha-tubulin transcriptsSmall nuclear RNAHigh molecular weight RNAMolecular weight RNASite-directed cleavageSL sequenceLeader RNATrypanosome cellsU6 snRNPsNuclear RNAU6 snRNATrypanosoma bruceiSplicing processSplicingWeight RNASnRNAEarly stepsRNAase HRNAIntronsConserved sequences in the U2 snRNA-encoding genes of Kinetoplastida do not include the putative branchpoint recognition region
Tschudi C, Williams S, Ullu E. Conserved sequences in the U2 snRNA-encoding genes of Kinetoplastida do not include the putative branchpoint recognition region. Gene 1990, 91: 71-77. PMID: 2401409, DOI: 10.1016/0378-1119(90)90164-m.Peer-Reviewed Original ResearchConceptsU2 small nuclear RNASmall nuclear RNAU2 genesEvolutionary conservationOrder KinetoplastidaConserved sequencesNuclear RNASequence variationFlanking regionsNuclear extractsRecognition sequenceKinetoplastidaUpstream elementRecognition regionGenesRNACorresponding sequenceLeishmania mexicana amazonensisSequenceT. congolenseTrypanosoma congolenseBiosynthesisNucleotidesProteinCongolense
1988
Polygene transcripts are precursors to calmodulin mRNAs in trypanosomes.
Tschudi C, Ullu E. Polygene transcripts are precursors to calmodulin mRNAs in trypanosomes. The EMBO Journal 1988, 7: 455-463. PMID: 3366120, PMCID: PMC454342, DOI: 10.1002/j.1460-2075.1988.tb02833.x.Peer-Reviewed Original ResearchConceptsCalmodulin mRNACultured procyclic trypanosomesAbundant RNA speciesSteady-state RNAPulse-labeled RNAAuthentic precursorIntergenic regionRNA speciesProcyclic trypanosomesCalmodulin genePolyadenylation sitesAfrican trypanosomesHybridization probesTranscriptsStreptavidin-agaroseDiscrete endsSmall familyTrypanosomesMRNAGenesRNASpeciesCalmodulinTrypanosoma brucei gambienseBrucei gambiense
1986
The U2 RNA analogue of Trypanosoma brucei gambiense: implications for a splicing mechanism in trypanosomes
Tschudi C, Richards F, Ullu E. The U2 RNA analogue of Trypanosoma brucei gambiense: implications for a splicing mechanism in trypanosomes. Nucleic Acids Research 1986, 14: 8893-8903. PMID: 3786140, PMCID: PMC311918, DOI: 10.1093/nar/14.22.8893.Peer-Reviewed Original ResearchConceptsU2 RNASpliced leader RNASingle-copy geneSignificant sequence homologyMaturation of mRNAMammalian counterpartsCopy geneU RNALeader RNASplicing mechanismSequence homologySecondary structureRNATrypanosomesGenesRNA analogSplicingHomologyTrypanosoma brucei gambiensePossible interactionsMRNABrucei gambienseMaturation
1984
Alu sequences are processed 7SL RNA genes
Ullu E, Tschudi C. Alu sequences are processed 7SL RNA genes. Nature 1984, 312: 171-172. PMID: 6209580, DOI: 10.1038/312171a0.Peer-Reviewed Original ResearchConceptsRNA genesAlu sequencesMiddle repetitive DNA sequencesAbundant cytoplasmic RNARepetitive DNA sequencesHuman 7SL RNAInsect sequencesAlu domainMammalian radiationDrosophila melanogasterEvolutionary distanceXenopus sequenceAbundant familyDNA sequencesNucleotide sequenceCDNA copyCytoplasmic RNAPair sequencePrimary structureProtein secretionRNAGenesHuman counterpartSequenceSignificant block