2023
Two cold shock domain containing proteins trigger the development of infectious Trypanosoma brucei
Toh J, Nkouawa A, Dong G, Kolev N, Tschudi C. Two cold shock domain containing proteins trigger the development of infectious Trypanosoma brucei. PLOS Pathogens 2023, 19: e1011438. PMID: 37276216, PMCID: PMC10270622, DOI: 10.1371/journal.ppat.1011438.Peer-Reviewed Original ResearchConceptsCold shock domainMetacyclic parasitesRegulation of transcriptionMicrotubule-based movementProtozoan parasite Trypanosoma bruceiCold shock proteinsRNA-binding proteinC-terminal domainFamily of DNAN-terminal domainDNA damage repairParasite Trypanosoma bruceiSpecific binding motifAmino acid residuesMammalian infectivityNucleocytoplasmic transportDevelopmental programProcyclic parasitesTrypanosoma bruceiCSD2CSD1MRNA stabilityBiological functionsBinding motifBiological processes
2017
The proteome and transcriptome of the infectious metacyclic form of Trypanosoma brucei define quiescent cells primed for mammalian invasion
Christiano R, Kolev NG, Shi H, Ullu E, Walther TC, Tschudi C. The proteome and transcriptome of the infectious metacyclic form of Trypanosoma brucei define quiescent cells primed for mammalian invasion. Molecular Microbiology 2017, 106: 74-92. PMID: 28742275, PMCID: PMC5607103, DOI: 10.1111/mmi.13754.Peer-Reviewed Original ResearchConceptsInfectious metacyclic formsTsetse fly vectorMetacyclic formsVariant surface glycoprotein expression sitesQuiescent cellsGene expression profilesFly vectorsAvailability of nutrientsMammalian invasionsCell surface componentsCell divisionProcyclic trypanosomesMammalian hostsTrypanosoma bruceiMRNA sequencingExpression profilesExpression sitesMetabolic enzymesBloodstream formsInfectious metacyclicsProtein 6TranscriptomeTsetse fliesProteomeProtein levels
2016
Transcriptome Profiling of Trypanosoma brucei Development in the Tsetse Fly Vector Glossina morsitans
Savage AF, Kolev NG, Franklin JB, Vigneron A, Aksoy S, Tschudi C. Transcriptome Profiling of Trypanosoma brucei Development in the Tsetse Fly Vector Glossina morsitans. PLOS ONE 2016, 11: e0168877. PMID: 28002435, PMCID: PMC5176191, DOI: 10.1371/journal.pone.0168877.Peer-Reviewed Original ResearchMeSH KeywordsAnimalsElectron Transport Complex IVGene Expression ProfilingGene LibraryHigh-Throughput Nucleotide SequencingInsect VectorsIntestinal MucosaLife Cycle StagesMembrane GlycoproteinsProtozoan ProteinsProventriculusSalivary GlandsSequence Analysis, RNATranscriptomeTrypanosoma brucei bruceiTsetse FliesUp-RegulationConceptsSalivary gland transcriptomeMetacyclic VSGsInsect vectorsHigh-throughput RNA sequencingBlood-feeding tsetse fliesDigenetic life cycleRNA-binding proteinGene ontology analysisAlanine-rich proteinCytochrome oxidase complexTsetse fliesMidgut transcriptomeGlobal regulatorDNA metabolismTrypanosome developmentOntology analysisDNA replicationSignal transductionTransporter familyMammalian hostsRNA sequencingDistinct tissuesTranscript levelsTranscriptomeRich protein
2012
Developmental Progression to Infectivity in Trypanosoma brucei Triggered by an RNA-Binding Protein
Kolev NG, Ramey-Butler K, Cross GA, Ullu E, Tschudi C. Developmental Progression to Infectivity in Trypanosoma brucei Triggered by an RNA-Binding Protein. Science 2012, 338: 1352-1353. PMID: 23224556, PMCID: PMC3664091, DOI: 10.1126/science.1229641.Peer-Reviewed Original Research
2009
Distinct and overlapping roles for two Dicer-like proteins in the RNA interference pathways of the ancient eukaryote Trypanosoma brucei
Patrick KL, Shi H, Kolev NG, Ersfeld K, Tschudi C, Ullu E. Distinct and overlapping roles for two Dicer-like proteins in the RNA interference pathways of the ancient eukaryote Trypanosoma brucei. Proceedings Of The National Academy Of Sciences Of The United States Of America 2009, 106: 17933-17938. PMID: 19815526, PMCID: PMC2764927, DOI: 10.1073/pnas.0907766106.Peer-Reviewed Original ResearchConceptsDicer-like enzymesRNA interferenceRNAi pathwayBiogenesis of siRNAsDicer-like proteinsNuclear RNAi pathwaySingle Argonaute proteinEnd modificationReverse genetic analysisRNAi-deficient cellsRNA interference (RNAi) pathwayWild-type cellsAncient eukaryotesArgonaute proteinsRNAi responseAncient traitRepeat transcriptsInterference pathwayCytoplasmic proteinsImportant human pathogenTrypanosoma bruceiGenetic analysisRNAi triggersFunctional analysisIntermediate transcripts
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 fractionFragmentsUnusual diversity in α-amanitin sensitivity of RNA polymerases in trichomonads
Vaňáčová Š, Tachezy J, Ullu E, Tschudi C. Unusual diversity in α-amanitin sensitivity of RNA polymerases in trichomonads. Molecular And Biochemical Parasitology 2001, 115: 239-247. PMID: 11420110, DOI: 10.1016/s0166-6851(01)00294-8.Peer-Reviewed Original ResearchConceptsUnusual diversityResistant RNA polymerase IIProtein coding genesParasitic protist Trichomonas vaginalisRNA polymerase IIAlpha-amanitin sensitivityProtist Trichomonas vaginalisGenus-specific patternsTritrichomonas foetusLysolecithin-permeabilized cellsUnicellular eukaryotesCoding genesPolymerase IIRNAP IIRNAP IIIRNA polymeraseTrichomonad speciesAlpha-amanitinT. vaginalisRNA synthesisΑ-amanitin sensitivityDiversityTrichomonadsRelated groupsEukaryotesIn vivo epitope tagging of Trypanosoma brucei genes using a one step PCR-based strategy
Shen S, Arhin G, Ullu E, Tschudi C. In vivo epitope tagging of Trypanosoma brucei genes using a one step PCR-based strategy. Molecular And Biochemical Parasitology 2001, 113: 171-173. PMID: 11254965, DOI: 10.1016/s0166-6851(00)00383-2.Peer-Reviewed Original ResearchCharacterization of a candidate Trypanosoma brucei U1 small nuclear RNA gene
Djikeng A, Ferreira L, D'Angelo M, Dolezal P, Lamb T, Murta S, Triggs V, Ulbert S, Villarino A, Renzi S, Ullu E, Tschudi C. Characterization of a candidate Trypanosoma brucei U1 small nuclear RNA gene. Molecular And Biochemical Parasitology 2001, 113: 109-115. PMID: 11254959, DOI: 10.1016/s0166-6851(00)00384-4.Peer-Reviewed Original Research
2000
Determinants for cap trimethylation of the U2 small nuclear RNA are not conserved between Trypanosoma brucei and higher eukaryotic organisms
Günzl A, Bindereif A, Ullu E, Tschudi C. Determinants for cap trimethylation of the U2 small nuclear RNA are not conserved between Trypanosoma brucei and higher eukaryotic organisms. Nucleic Acids Research 2000, 28: 3702-3709. PMID: 11000261, PMCID: PMC110770, DOI: 10.1093/nar/28.19.3702.Peer-Reviewed Original ResearchMeSH KeywordsAnimalsBase SequenceBinding SitesCell LineConserved SequenceGuanosineMethylationMolecular Sequence DataMutationNucleic Acid ConformationPrecipitin TestsPromoter Regions, GeneticProtein BindingRegulatory Sequences, Nucleic AcidRibonucleoproteins, Small NuclearRNA CapsRNA, ProtozoanRNA, Small NuclearTransfectionTrypanosoma brucei bruceiConceptsCap trimethylationRibonucleoprotein particleEukaryotic organismsU2 snRNATrypanosoma bruceiU2 small nuclear RNA genesCap structureProtist parasite Trypanosoma bruceiSmall nuclear RNA genesCommon proteinsU2 small nuclear RNANuclear RNA genesHigher eukaryotic organismsRNA polymerase IIRNA polymerase IIISmall nuclear RNAMutant U2 snRNAsSet of proteinsParasite Trypanosoma bruceiSpliceosomal snRNPsRNP assemblyNuclear importPolymerase IIRNA genesSequence motifsCotranscriptional 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 linesRNAOrganismsInterferenceImport of proteins into the trypanosome nucleus and their distribution at karyokinesis
Marchetti M, Tschudi C, Kwon H, Wolin S, Ullu E. Import of proteins into the trypanosome nucleus and their distribution at karyokinesis. Journal Of Cell Science 2000, 113: 899-906. PMID: 10671379, DOI: 10.1242/jcs.113.5.899.Peer-Reviewed Original ResearchConceptsNuclear localization sequenceMonopartite nuclear localization sequenceBipartite nuclear localization sequenceFusion proteinSpecific nuclear localization sequencesImport of proteinsEarly divergent eukaryoteGreen fluorescent proteinDivergent eukaryotesOrganism's proteinsChromosome segregationBeta-galactosidase reporterTrypanosomatid protozoaProtein homologueTrypanosomal proteinsHistone H2BHistone H2B.Localization sequenceNuclear divisionLa proteinC-terminusTrypanosome nucleusMitotic cellsFluorescent proteinATP synthesisA new twist in trypanosome RNA metabolism: cis-splicing of pre-mRNA.
Mair G, Shi H, Li H, Djikeng A, Aviles H, Bishop J, Falcone F, Gavrilescu C, Montgomery J, Santori M, Stern L, Wang Z, Ullu E, Tschudi C. A new twist in trypanosome RNA metabolism: cis-splicing of pre-mRNA. RNA 2000, 6: 163-9. PMID: 10688355, PMCID: PMC1369902, DOI: 10.1017/s135583820099229x.Peer-Reviewed Original ResearchConceptsCis-spliced intronsSplice siteGT/AG ruleSmall intergenic regionAncient acquisitionGene arrangementTrypanosome genomeEukaryotic cellsRNA metabolismIntergenic regionIntron removalLeader sequenceTrypanosoma bruceiIntronsNucleotide positionsAG dinucleotideEuglena gracilisTrypanosoma cruziPolymerase geneIdentical positionsPoint mutationsRecent discoveryPAP mRNAGenesMRNA
1998
Double-stranded RNA induces mRNA degradation in Trypanosoma brucei
Ngô H, Tschudi C, Gull K, Ullu E. Double-stranded RNA induces mRNA degradation in Trypanosoma brucei. Proceedings Of The National Academy Of Sciences Of The United States Of America 1998, 95: 14687-14692. PMID: 9843950, PMCID: PMC24510, DOI: 10.1073/pnas.95.25.14687.Peer-Reviewed Original ResearchConceptsMRNA degradationUntranslated regionFlagellar attachment zoneMRNA 5' untranslated regionAlpha-tubulin synthesisImportant protozoan parasitesCaenorhabditis elegansAlpha-tubulin mRNACellular mRNAsTrypanosome cellsGenetic interferenceCytoskeletal structuresCleavage furrowDsRNA transfectionSame phenotypeCytokinesisComplex cortical structureFlagellar axonemeTubulin mRNAPlasmid vectorProtozoan parasiteVivo expressionAttachment zoneMRNADsRNAExonic Sequences in the 5′ Untranslated Region of α-Tubulin mRNA Modulate trans Splicing in Trypanosoma brucei
López-Estraño C, Tschudi C, Ullu E. Exonic Sequences in the 5′ Untranslated Region of α-Tubulin mRNA Modulate trans Splicing in Trypanosoma brucei. Molecular And Cellular Biology 1998, 18: 4620-4628. PMID: 9671472, PMCID: PMC109048, DOI: 10.1128/mcb.18.8.4620.Peer-Reviewed Original ResearchTrypanosome Capping Enzymes Display a Novel Two-Domain Structure
Silva E, Ullu E, Kobayashi R, Tschudi C. Trypanosome Capping Enzymes Display a Novel Two-Domain Structure. Molecular And Cellular Biology 1998, 18: 4612-4619. PMID: 9671471, PMCID: PMC109047, DOI: 10.1128/mcb.18.8.4612.Peer-Reviewed Original ResearchMeSH KeywordsAmino Acid SequenceAnimalsBase SequenceBinding SitesCloning, MolecularConserved SequenceCrithidia fasciculataDNA, ProtozoanGuanosine MonophosphateHumansMiceMolecular Sequence DataRecombinant Fusion ProteinsRNA NucleotidyltransferasesSequence Homology, Amino AcidTrypanosoma brucei bruceiConceptsSpliceosomal small nuclear RNAsM7G capCapping enzymeTwo-domain structureG capYeast capping enzymesSmall nuclear RNAPhosphate-binding loopAmino-terminal halfCarboxy-terminal halfGTP-binding proteinsDiphosphate endTrans splicingSignature motifTranscript elongationM7G residueSL sequenceTrypanosomatid protozoaEukaryotic mRNAsLeader RNAGene codesRNA modificationsNuclear RNAOverall identityTrypanosoma bruceiPhysical and transcriptional analysis of the Trypanosoma brucei genome reveals a typical eukaryotic arrangement with close interspersionof RNA polymerase II- and III-transcribed genes
Marchetti M, Tschudi C, Silva E, Ullu E. Physical and transcriptional analysis of the Trypanosoma brucei genome reveals a typical eukaryotic arrangement with close interspersionof RNA polymerase II- and III-transcribed genes. Nucleic Acids Research 1998, 26: 3591-3598. PMID: 9671824, PMCID: PMC147737, DOI: 10.1093/nar/26.15.3591.Peer-Reviewed Original ResearchMeSH KeywordsAnimalsBase SequenceChloramphenicol O-AcetyltransferaseDNA, ProtozoanEukaryotic CellsGene DosageGenome, ProtozoanMolecular Sequence DataPromoter Regions, GeneticProtozoan ProteinsRibonucleoprotein, U2 Small NuclearRibonucleoproteins, Small NuclearRNA Polymerase IIRNA Polymerase IIIRNA, MessengerTranscription, GeneticTrypanosoma brucei bruceiConceptsPol II transcription unitsPol III genesSmall nuclear RNAU3 small nuclear RNACAT gene cassettePol IITranscription unitRNA genesTranscriptional domainsPol IIICAT mRNAU2 small nuclear RNARNA gene lociPol II genesRNA polymerase IIGene cassettesMRNA processing signalsPolymerase IITranscriptional mapTranscriptional analysisCosmid clonesNuclear RNADistinct initiation sitesCAT geneGene locus
1997
Structure of the Trypanosoma brucei U6 snRNA gene promoter
Nakaar V, Günzl A, Ullu E, Tschudi C. Structure of the Trypanosoma brucei U6 snRNA gene promoter. Molecular And Biochemical Parasitology 1997, 88: 13-23. PMID: 9274863, DOI: 10.1016/s0166-6851(97)00078-9.Peer-Reviewed Original ResearchConceptsU6 snRNA gene promoterSnRNA gene promotersB-boxGene promoterA boxSnRNA gene transcriptionInternal control regionRNA polymerase IIITRNA-like genesU6 transcriptionChromatin organizationTranscription extractRNA genesTranscription unitYeast SaccharomycesYeast systemControl regionPolymerase IIIStart siteGene transcriptionNucleotides upstreamPromoter elementsTrypanosoma bruceiIntragenic sequencesSaturation mutagenesisTranscription of the Trypanosoma brucei spliced leader RNA gene is dependent only on the presence of upstream regulatory elements
Günzl A, Ullu E, Dörner M, Fragoso S, Hoffmann K, Milner J, Morita Y, Nguu E, Vanacova S, Wünsch S, Dare A, Kwon H, Tschudi C. Transcription of the Trypanosoma brucei spliced leader RNA gene is dependent only on the presence of upstream regulatory elements. Molecular And Biochemical Parasitology 1997, 85: 67-76. PMID: 9108549, DOI: 10.1016/s0166-6851(96)02816-2.Peer-Reviewed Original Research