Genome-wide mapping of 5-hydroxymethyluracil in Trypanosoma brucei
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PROVIDER: PRJNA745154 | ENA |
REPOSITORIES: ENA
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Project description:5-Hydroxymethyluracil (5hmU) is a thymine modification existing in the genomes of a number of living organisms. The post-replicative formation of 5hmU occurs via hydroxylation of thymine, which can be mediated by the ten-eleven translocation (TET) dioxygenases in mammalian and J-binding proteins (JBPs) in protozoan genomes, respectively. In addition, 5hmU also can be generated through oxidation of thymine by reactive oxygen species or from deamination of 5hmC by activation-induced cytidine deaminase (AID) or APOBEC family enzymes. While the biological roles of 5hmU have not been fully explored, identifying its genomic location will assist in elucidating its functions. Herein, we report a method of enzyme-mediated bioorthogonal labeling to selectively enrich genomic regions containing 5hmU. 5hmU DNA kinase (5hmUDK) was utilized to selectively install an azide group or alkynyl group into the hydroxyl group of 5hmU followed by incorporation of the biotin linker through click chemistry and capture of 5hmU-containing DNA fragments via streptavidin pull-down. The enriched fragments were applied to deep sequencing to map the location of 5hmU. With this established enzyme-mediated bioorthogonal labeling strategy, we achieved the genome-wide mapping of 5hmU in Trypanosoma brucei (T. brucei) genomes. The method described here will allow for a better understanding of the functional roles and dynamics of 5hmU in genomes
2021-07-11 | GSE179809 | GEO
Project description:Base J, β-D-glucosyl-hydroxymethyluracil, is an epigenetic modification of thymine in the nuclear DNA of flagellated protozoa of the order Kinetoplastida. J is enriched at sites involved in RNA Polymerase (RNAP) II initiation and termination. We have previously demonstrated a role of J in regulating RNAP II initiation in Trypanosoma cruzi. Reduction of J in Leishmania tarentolae via growth in BrdU resulted in cell death and indicated a role of J in the regulation of RNAP II termination. To further explore J function in RNAP II termination among kinetoplastids and avoid indirect effects associated with BrdU toxicity and genetic deletions, we inhibited J synthesis in L. major and T. brucei using DMOG. Reduction of J in L. major resulted in genome-wide defects in transcription termination and the generation of antisense RNAs, without cell death. In contrast, loss of J in T. brucei did not lead to genome-wide termination defects; however, the loss of J at specific sites within polycistronic gene clusters led to altered transcription elongation and increased expression of downstream genes. Thus, J regulation of transcription termination genome-wide is restricted to Leishmania spp., while in T. brucei it regulates RNAP II elongation and gene expression at specific genomic loci.
2015-05-18 | GSE57621 | GEO
Project description:Trypanosoma brucei gambiense is the causative agent of the fatal human disease African sleeping sickness. Using Digital Gene Expression we have compared the transcriptome of a group 1 T.b.gambiense (Eliane) and a T.b.brucei (STIB 247).
2022-08-31 | GSE23885 | GEO
Project description:Base J, β-D-glucosyl-hydroxymethyluracil, is an epigenetic modification of thymine in the nuclear DNA of flagellated protozoa of the order Kinetoplastida. J is enriched at sites involved in RNA Polymerase (RNAP) II initiation and termination. We have previously demonstrated a role of J in regulating RNAP II initiation in Trypanosoma cruzi. Reduction of J in Leishmania tarentolae via growth in BrdU resulted in cell death and indicated a role of J in the regulation of RNAP II termination. To further explore J function in RNAP II termination among kinetoplastids and avoid indirect effects associated with BrdU toxicity and genetic deletions, we inhibited J synthesis in L. major and T. brucei using DMOG. Reduction of J in L. major resulted in genome-wide defects in transcription termination and the generation of antisense RNAs, without cell death. In contrast, loss of J in T. brucei did not lead to genome-wide termination defects; however, the loss of J at specific sites within polycistronic gene clusters led to altered transcription elongation and increased expression of downstream genes. Thus, J regulation of transcription termination genome-wide is restricted to Leishmania spp., while in T. brucei it regulates RNAP II elongation and gene expression at specific genomic loci. We studied the effect of loss of base J on transcription using WT and WT cells grown in DMOG-containing medium. We used 2 RNA-seq libraries containing processed RNA products and 4 small RNA libraries representing the entire transcriptome.
2015-05-18 | E-GEOD-57621 | biostudies-arrayexpress
Project description:The host range of African trypanosomes is influenced by innate protective molecules in the blood of primates. A subfraction of human high-density lipoprotein (HDL) containing apolipoprotein A-I, apolipoprotein L-I, and haptoglobin-related protein is toxic to Trypanosoma brucei brucei but not the human sleeping sickness parasite Trypanosoma brucei rhodesiense. It is thought that T. b. rhodesiense evolved from a T. b. brucei-like ancestor and expresses a defense protein that ablates the antitrypanosomal activity of human HDL. To directly investigate this possibility, we developed an in vitro selection to generate human HDL-resistant T. b. brucei. Here we show that conversion of T. b. brucei from human HDL sensitive to resistant correlates with changes in the expression of the variant surface glycoprotein (VSG) and abolished uptake of the cytotoxic human HDLs. Complete transcriptome analysis of the HDL-susceptible and -resistant trypanosomes confirmed that VSG switching had occurred but failed to reveal the expression of other genes specifically associated with human HDL resistance, including the serum resistance-associated gene (SRA) of T. b. rhodesiense. In addition, we found that while the original active expression site was still utilized, expression of three expression site-associated genes (ESAG) was altered in the HDL-resistant trypanosomes. These findings demonstrate that resistance to human HDLs can be acquired by T. b. brucei. Keywords: Trypanosoma, VSG, antigenic switching, HDL-resistance
2007-07-04 | GSE8369 | GEO
Project description:Genomic shotgun sequences of Trypanosoma brucei brucei from Uganda with minimal laboratory passage.
2020-11-22 | E-MTAB-9759 | biostudies-arrayexpress
Project description:Trypanosoma brucei brucei Raw sequence reads
| PRJNA291132 | ENA
Project description:Trypanosoma brucei brucei edited mRNA transcriptomes
| PRJNA369536 | ENA
Project description:Trypanosoma brucei brucei Raw sequence reads
| PRJNA292451 | ENA