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MRNA adenosine methylase (MTA) deposits m6A on pri-miRNAs to modulate miRNA biogenesis in Arabidopsis thaliana [nuclear fraction]

ABSTRACT: RNA-IP was performed on nuclear fraction of chemically cross linked MTA-GFP and GFP (control) plant tissues followed by sequencing of NGS libraries

ORGANISM(S): Arabidopsis thaliana

PROVIDER: GSE125996 | GEO | 2022/02/01

REPOSITORIES: GEO

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mRNA adenosine methylase (MTA) deposits m6A on pri-miRNAs to modulate miRNA biogenesis in Arabidopsis thaliana [smallRNAs]

Project description:In order to assess the possible effects of m6A on miRNA biogenesis we performed small RNA (sRNA) sequencing to compare their levels in WT Col-0 plants to those in mutant lines with severely reduced m6A levels. The reduced mta line contains MTA cDNA under the ABI3 promoter in MTA null mutant background (ABI3:MTA) and ABI3 being an embryo specific promoter rescues the embryo lethal phenotype of MTA knockout while keeping the levels of MTA in mature plants severely low34. sRNAs isolated from 4 week old WT and mta plants were used to make libraries that were sequenced using HiSeq® (Illumina) and the results were analyzed using NOISeq package in R-Studio.

2020-09-21 | GSE122526 | GEO

mRNA adenosine methylase (MTA) deposits m6A on pri-miRNAs to modulate miRNA biogenesis in Arabidopsis thaliana [m6A_IP]

Project description:We performed m6A-RNA immunoprecipitation followed by sequencing (m6A-IP Seq) using libraries produced with unfragmented ployA+ RNA from 4 week old WT Col-0 and mta plants.

2020-09-21 | GSE122525 | GEO

mRNA adenosine methylase (MTA) deposits m6A on pri-miRNAs to modulate miRNA biogenesis in Arabidopsis thaliana.

Project description:In Arabidopsis thaliana, the METTL3 homolog, mRNA adenosine methylase (MTA) introduces N 6-methyladenosine (m6A) into various coding and noncoding RNAs of the plant transcriptome. Here, we show that an MTA-deficient mutant (mta) has decreased levels of microRNAs (miRNAs) but accumulates primary miRNA transcripts (pri-miRNAs). Moreover, pri-miRNAs are methylated by MTA, and RNA structure probing analysis reveals a decrease in secondary structure within stem-loop regions of these transcripts in mta mutant plants. We demonstrate interaction between MTA and both RNA Polymerase II and TOUGH (TGH), a plant protein needed for early steps of miRNA biogenesis. Both MTA and TGH are necessary for efficient colocalization of the Microprocessor components Dicer-like 1 (DCL1) and Hyponastic Leaves 1 (HYL1) with RNA Polymerase II. We propose that secondary structure of miRNA precursors induced by their MTA-dependent m6A methylation status, together with direct interactions between MTA and TGH, influence the recruitment of Microprocessor to plant pri-miRNAs. Therefore, the lack of MTA in mta mutant plants disturbs pri-miRNA processing and leads to the decrease in miRNA accumulation. Furthermore, our findings reveal that reduced miR393b levels likely contributes to the impaired auxin response phenotypes of mta mutant plants.

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mRNA adenosine methylase (MTA) deposits m6A on pri-miRNAs to modulate miRNA biogenesis in Arabidopsis thaliana

Project description:This SuperSeries is composed of the SubSeries listed below.

2020-09-21 | GSE122528 | GEO

mRNA adenosine methylase (MTA) deposits m6A on pri-miRNAs to modulate miRNA biogenesis in Arabidopsis thaliana [nuclear fraction]

Project description:mRNA adenosine methylase (MTA) deposits m6A on pri-miRNAs to modulate miRNA biogenesis in Arabidopsis thaliana [nuclear fraction]

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mRNA adenosine methylase (MTA) deposits m6A on pri-miRNAs to modulate miRNA biogenesis in Arabidopsis thaliana

Project description:mRNA adenosine methylase (MTA) deposits m6A on pri-miRNAs to modulate miRNA biogenesis in Arabidopsis thaliana

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mRNA adenosine methylase (MTA) deposits m6A on pri-miRNAs to modulate miRNA biogenesis in Arabidopsis thaliana [m6A_IP]

Project description:mRNA adenosine methylase (MTA) deposits m6A on pri-miRNAs to modulate miRNA biogenesis in Arabidopsis thaliana [m6A_IP]

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mRNA adenosine methylase (MTA) deposits m6A on pri-miRNAs to modulate miRNA biogenesis in Arabidopsis thaliana [smallRNAs]

Project description:mRNA adenosine methylase (MTA) deposits m6A on pri-miRNAs to modulate miRNA biogenesis in Arabidopsis thaliana [smallRNAs]

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mRNA ADENOSINE METHYLASE promotes drought tolerance through N6-methyladenosine-dependent and independent impacts on mRNA regulation in Arabidopsis

Project description:• Among many mRNA modifications, adenine methylation at the N6 position (N6-methyladenosine, m6A) is known to affect mRNA biology extensively. The influence of m6A has yet to be assessed under drought, one of the most impactful abiotic stresses. • We show that Arabidopsis thaliana (L.) Heynh. (Arabidopsis) plants lacking mRNA ADENOSINE METHYLASE (MTA) are drought sensitive. Subsequently, we comprehensively assess the impacts of MTA-dependent m6A changes during drought on mRNA abundance, stability, and translation in Arabidopsis. • During drought, there is a global trend towards hyper-methylation of many protein-coding transcripts that does not occur in mta. We also observe complex regulation of m6A at a transcript-specific level, possibly reflecting compensation by other m6A components. Importantly, a subset of transcripts that are hyper-methylated in an MTA-dependent manner exhibited reduced turnover and translation in mta, compared to wild-type plants, during drought. Additionally, MTA impacts transcript stability and translation independently of m6A. We also correlate drought-associated deposition of m6A with increased translation of modulators of drought response, such as RD29A, COR47, COR413, ALDH2B, ERD7, and ABF4 in WT, which is impaired in mta. • m6A is dynamic during drought and, alongside MTA, promotes tolerance by regulating drought-responsive changes in transcript turnover and translation.

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Gene expression profiling of sarcoma cells treated with mithramycin A (MTA), nano-encapsulated MTA or MTA-analogs

Project description:This study was designed to gain insight about the mechanisms involved in the anti-tumor effects of mithramycin A (MTA) and the MTA analog EC-8042 in sarcoma cells. In addition, we also studied whether this molecular features could be influenced by the nano-encapsulation of MTA.

2021-03-30 | GSE161616 | GEO

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