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Metabolomics,Unknown,Transcriptomics,Genomics,Proteomics

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Arabidopsis AGO3 predominantly recruits 24-nucleotide small RNAs to regulate epigenetic silencing [Bisulfite-seq]

ABSTRACT: AGO3 predominantly bound 24-nt sRNAs with 5â terminal adenine. The spectrum of AGO3-associated sRNAs was different from those bound to AGO2. By contrast, approximately 30% of AGO3-bound 24-nt sRNAs overlapped with those bound to AGO4 and over 60% of AGO3-associated 24-nt sRNA enriched loci were identical to those of AGO4. In addition, expression of AGO3 driven by AGO4 native promoter partially complemented AGO4 function and rescued DNA methylation defect in ago4-1 background. Examination of DNA methylation using bisulfite conversion of unmethylated cytosines in three genetic backgrounds of Arabidopsis thaliana.

ORGANISM(S): Arabidopsis thaliana

SUBMITTER: Xiuying Liu

PROVIDER: E-GEOD-78089 | biostudies-arrayexpress |

REPOSITORIES: biostudies-arrayexpress

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Arabidopsis AGO3 predominantly recruits 24-nucleotide small RNAs to regulate epigenetic silencing [miRNA-seq]

Project description:AGO3 predominantly bound 24-nt sRNAs with 5â?? terminal adenine. The spectrum of AGO3-associated sRNAs was different from those bound to AGO2. By contrast, approximately 30% of AGO3-bound 24-nt sRNAs overlapped with those bound to AGO4 and over 60% of AGO3-associated 24-nt sRNA enriched loci were identical to those of AGO4. In addition, expression of AGO3 driven by AGO4 native promoter partially complemented AGO4 function and rescued DNA methylation defect in ago4-1 background. Examination of AGO3 and AGO2 bound small RNAs with/without salt stress.

2016-05-31 | E-GEOD-78088 | biostudies-arrayexpress

Arabidopsis AGO3 predominantly recruits 24-nucleotide small RNAs to regulate epigenetic silencing [Bisulfite-seq]

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2016-05-31 | GSE78089 | GEO

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Imprinted expression of genes and small RNA is triggered by localized demethylation of the maternal genome in rice endosperm

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Deciphering the cell-specific role of Arabidopsis Argonaute 3 [smallRNA-Seq]

Project description:ARGONAUTE (AGO) proteins are the major effectors of RNA silencing. In Arabidopsis, loading of 21-22-nt long small RNAs into AGOs results in post-transcriptional gene silencing (PTGS) by mRNA cleavage and/or translational repression. On the other hand, loading of 24-nt sRNAs results in transcriptional gene silencing (TGS) by RNA directed DNA methylation (RdDM). The Arabidopsis genome encodes 10 AGOs, which are known, for most, to belong to either pathway. Here we characterized the cell specific role of Arabidopsis AGO3. It is specifically expressed in tissue close to vascular termination and strongly accumulates in chalazal seed integuments. AGO3 encodes a functional AGO able to bind sRNAs with a preference for 24nt in length with a 5’ nucleotide bias for Adenosine. Down-regulation of AGO3 affects gene expression in siliques and its expression is strongly induced in the plant vasculature upon proteasome inhibition. Our results suggest that AGO3 might act to regulate gene expression by a novel RNA silencing pathway involving 24nt sRNA-directed PTGS.

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