Project description:Here, we adopt a method that combines tRNA-seq and cp-RNA-seq to identify and quantify tRFs and tRNAs in plants. We provide a high-quality expression atlas of tRFs and tRNAs in Arabidopsis and rice, and uncovers complex tRFs repertoire and the dynamic expressions of tRNA genes in plants.
Project description:Here, we apply tRNA-seq and YAMAT-seq to profile the expressions of tRFs and tRNAs in plants. We provide a high-quality expression atlas of tRFs and tRNAs in Arabidopsis and rice, and uncover complex tRF population and the dynamic expressions of tRNA genes in plants.
Project description:Annotation of tRNA fragments relies on the alignment of signals obtained from small RNA-seq on mature tRNA positions and requires the pretreatment of the RNA to remove tRNA modifications that may interfere with sequencing.
Project description:The human genome encodes hundreds of tRNA genes but their individual contribution to the tRNA pool is not fully understood. Deep sequencing of tRNA transcripts (tRNA-Seq) can estimate tRNA abundance at single gene resolution, but tRNA structures and post-transcriptional modifications impair these analyses. Here we present a bioinformatics strategy to investigate differential tRNA gene expression and use it to compare tRNA-Seq datasets from cultured human cells and human brain. We find that sequencing caveats affect quantitation of only a subset of human tRNA genes. Unexpectedly, we detect several cases where the differences in tRNA expression among samples do not involve variations at the level of isoacceptor tRNA sets (tRNAs charged with the same amino acid but using different anticodons); but rather among tRNA genes within the same isodecoder set (tRNAs having the same anticodon sequence). Because isodecoder tRNAs are functionally equal in terms of genetic translation, their differential expression may be related to non-canonical tRNA functions. We show that several instances of differential tRNA gene expression result in changes in the abundance of tRNA-derived fragments (tRFs) but not of mature tRNAs. Examples of differentially expressed tRFs include: PIWI-associated RNAs, tRFs present in tissue samples but not in cells cultured in vitro, and somatic tissue-specific tRFs. Our data support that differential expression of tRNA genes regulate non-canonical tRNA functions performed by tRFs.
Project description:tRNA related fragments(tRF) and tRNA halves(tiRNA) are novel class of short non-coding RNA derived from tRNAs. Using RNA sequencing, we evaluated the tRFs/tiRNAs expression profiles in relapsed/refractory multiple myeloma and multiple myeloma patients. Bioinformatics analyses indicated that tRFs/tiRNAs may be involved in the progression and drug-resistance of multiple myeloma.
Project description:In neonatal islets from P10 rats, 3 sets of tRNA-derived fragments (tiRNA-5HisGTG/GluCTC/GluTTC) were inhibited with LNA inhibitiors ex vivo and mRNA-seq was performed to potentially identify the gene expression changes upon the inhibition
Project description:To identify tRNA fragments regulated by angiogenin (ANG, Rnase 5), we sequenced 15-50nt small RNAs upon ANG overexpression and ANG knockout.
Project description:We report a modulated expression of tRNA fragments and microRNAs linked to chondrosarcoma progression and demonstrate a method for re-modulating this pathway