Apicomplexa
Ontology highlight
ABSTRACT:
PROVIDER: PRJNA436572 | ENA |
REPOSITORIES: ENA
Dataset's files
| Action | DRS | |||
|---|---|---|---|---|
| SRR6795740.fastq.gz | Fastqsanger.gz | |||
| SRR6795750.fastq.gz | Fastqsanger.gz | |||
| SRR6795741.fastq.gz | Fastqsanger.gz | |||
| SRR6795751.fastq.gz | Fastqsanger.gz | |||
| SRR6795742.fastq.gz | Fastqsanger.gz |
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Project description:N6-methyladenosine (m6A) is a widespread reversible chemical modification of RNAs, implicated in many aspects of RNA metabolism. Little quantitative information exists as to either how many transcript copies of particular genes are m6A modified (âm6A levelsâ), or the relationship of m6A modification(s) to alternative RNA isoforms. To deconvolute the m6A epitranscriptome, we developed m6A level and isoform-characterization sequencing (m6A-LAIC-seq). We found that cells exhibit a broad range of non-stoichiometric m6A levels with cell type specificity. At the level of isoform characterization, we discovered widespread differences in use of tandem alternative polyadenylation (APA) sites by methylated and nonmethylated transcript isoforms of individual genes. Strikingly, there is a strong bias for methylated transcripts to be coupled with proximal APA sites, resulting in shortened 3â untranslated regions (3â-UTRs), while nonmethylated transcript isoforms tend to use distal APA sites. m6A-LAIC-seq yields a new perspective on transcriptome complexity and links APA usage to m6A modifications. m6A-LAIC-seq of H1-ESC and GM12878 cell lines, each cell line has two replicates
2016-06-24 | E-GEOD-66086 | biostudies-arrayexpress
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Project description:We sequenced the 3' ends of polyadenylated transcripts among total RNA in fission yeast wildtype and rdp1∆ cells and mapped the 3'-most nucleotide prior to polyadenylation. We find that mRNA-coding open reading frames have a low number of polyadenylation sites with most of the reads, whereas pericentromeric dg and dh repeats have a high number of polyadenylation sites throughout the transcribed region, mapping to both strands. direct sequencing of polyadenylated 3' ends of RNA (Helicos)
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Project description:Malaria and related apicomplexan parasites have two highly conserved organellar genomes: one is of plastid (pl) origin, and the other is mitochondrial (mt). The organization of both organellar DNA molecules from the human malaria parasite Plasmodium falciparum has been determined, and they have been shown to be tightly packed with genes. The 35-kb circular DNA is the smallest known vestigial plastid genome and is presumed to be functional. All but two of its recognized genes are involved with genetic expression: one of the two encodes a member of the clp family of molecular chaperones, and the other encodes a conserved protein of unknown function found both in algal plastids and in eubacterial genomes. The possible evolutionary source and intracellular location of the plDNA are discussed. The 6-kb tandemly repeated mt genome is the smallest known and codes for only three proteins (cytochrome b and two subunits of cytochrome oxidase) as well as two bizarrely fragmented rRNAs. The organization of the mt genome differs somewhat among genera. The mtDNA sequence provides information not otherwise available about the structure of apicomplexan cytochrome b as well as the unusually fragmented rRNAs. The malarial mtDNA has a phage-like replication mechanism and undergoes extensive recombination like the mtDNA of some other lower eukaryotes.
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