Ontology highlight
ABSTRACT:
PROVIDER: PRJNA450503 | ENA |
REPOSITORIES: ENA
Dataset's files
| Action | DRS | |||
|---|---|---|---|---|
| SRR7012467.fastq.gz | Fastqsanger.gz |
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Project description:Non-AUG translation initiation is crucial for regulating translation, which can generate N-terminally extended protein isoforms with diverse biological functions. However, a comprehensive view of non-AUG translation initiation events with N-terminal extensions (NTEs) across monocots and dicots remains limited. Here, we identified a total of 879 transcripts undergoing non-AUG translation initiation events with NTEs in maize, rice and soybean using a computational prediction-combined proteogenomic strategy. Over half the non-AUG initiated candidates had multiple putative upstream translation initiation sites (uTISs), with GUG being the most common uTIS, followed by CUG in monocots and AUU in the dicot. Sequence context analyses showed that these putative uTISs tended to have Kozak sequence and high AG content favoring initiation. Additionally, non-AUG initiated candidates had longer 5' untranslated regions (UTRs) across all species, whereas other transcript features showed contrasting trends between monocots and the dicot. Furthermore, non-AUG initiated candidates in maize were implicated in essential cellular processes and diverse functional signals were observed in the NTEs, suggesting their biological implications. This study provides a comprehensive landscape of the shared and distinct characteristics of non-AUG translation initiation between monocot and dicot plants, and highlights the complexity of genetic decoding in shaping the dynamic composition of plant proteomes.
2026-04-27 | PXD058528 | Pride
Project description:In monocots other than the cereals maize and rice, the repertoire and diversity of microRNAs (miRNAs) and the populations of phased, secondary, small interfering RNAs (phasiRNAs) are poorly characterized. To remedy this, we sequenced small RNAs (sRNAs) from vegetative and dissected inflorescence tissue in 28 phylogenetically diverse monocots and from several early-diverging angiosperm lineages, as well as publicly available data from 10 additional monocot species. We annotated miRNAs, siRNAs and phasiRNAs across the monocot phylogeny, identifying miRNAs apparently lost or gained in the grasses relative to other monocot families, as well as a number of tRNA fragments misannotated as miRNAs. Using our miRNA database cleaned of these misannotations, we identified conservation at the 8th, 9th, 19th and 3’ end positions that we hypothesize are signatures of selection for processing, targeting, or Argonaute sorting. We show that 21-nt reproductive phasiRNAs are far more numerous in grass genomes than other monocots. Based on sequenced monocot genomes and transcriptomes, DICER-LIKE 5 (DCL5), important to 24-nt phasiRNA biogenesis, likely originated via gene duplication before the diversification of the grasses. This curated database of phylogenetically diverse monocot miRNAs, siRNAs, and phasiRNAs is the largest collection to date, and should facilitate continued exploration of small RNA diversification in flowering plants.
2020-04-17 | GSE148762 | GEO
Project description:Lilioid monocots core group genome sequencing and assembly
| PRJNA714837 | ENA
Project description:The phytohormone cytokinin plays a significant role in nearly all aspects of plant growth and development. Cytokinin signaling has primarily been studied in the dicot model Arabidopsis, with relatively little work done in monocots, which include rice (Oryza sativa) and other cereals of agronomic importance. The cytokinin signaling pathway is a phosphorelay comprised of the histidine kinase receptors (HKs), the authentic histidine phosphotransfer proteins (AHPs), and the type-B Response Regulators (ARRs). Two negative regulators of cytokinin signaling have been identified: the type-A ARRs, which are cytokinin primary response genes, and the pseudo histidine phosphotransfer proteins (PHPs), which lack the His residue required for phosphorelay. Here, we describe the role of the PHP genes from rice. Phylogenic analysis indicates that the PHPs are generally first found in the genomes of gymnosperms and that they arose independently in monocots and dicots. Consistent with this, the three rice PHPs fail to complement an Arabidopsis php mutant (ahp6). Disruption of the three PHPs results in a molecular phenotype consistent with these elements acting as negative regulators of basal cytokinin signaling, including the constitutive up-regulation of a number of type-A RR and cytokinin oxidase genes. The triple php mutant affects multiple aspects of rice growth and development, including shoot morphology, panicle architecture and seed fill. However, in contrast to Arabidopsis, disruption of the rice PHPs does not affect root vascular patterning, suggesting that while many aspects of key signaling networks are conserved between monocots and dicots, the molecular components regulating some processes are distinct.
2022-12-31 | GSE141408 | GEO
Project description:EBP affiliated project -- Lilioid Monocots Genome sequencing and assembly
| PRJNA948806 | ENA
Project description:This experiment probed for the presence of known Arabidopsis and rice microRNAs in total RNA samples derived from species representative of the major groups of land plants: Eudicots (Arabidopsis thaliana, Nicotiana benthamiana), monocots (Oryza satica, Triticum aestivum), magnoliids (Liriodendron tulipifera), gymnosperms (Pinus resinosa), ferns (Ceratopteris thalictroides), lycopods (Selaginella uncinata), and mosses (Polytrichum juniperinum). In most cases two technical or biological replicates were performed.
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