Expression profiling of small RNAs in control and H2O2-treated rice seedlings
Ontology highlight
ABSTRACT:
ORGANISM(S): Oryza sativa
PROVIDER: GSE23217 | GEO | 2010/08/15
SECONDARY ACCESSION(S): PRJNA131313
REPOSITORIES: GEO
Similar Datasets
Project description:We aimed to identify putative H2O2-regulated miRNAs expressed in rice seedlings under oxidative stress by using a deep sequencing approach developed by Solexa (Illumina). Two small RNA libraries were constructed from H2O2-treated and control rice seedlings, and more than five million small RNA sequence reads were generated for each library. We identified seven H2O2-responsive miRNA families via expression profiling of the miRNAs based on a comparative miRNAomic analysis in combination with experimental validation. Furthermore, 32 miRNAs, 17 from known miRNA loci and 15 from novel miRNA loci, were also newly identified from the sequencing data. To the best of our knowledge, this is the first report of a systematic investigation of H2O2-regulated miRNAs and their targets in plants. Examination of 2 different small RNA expression profilings in the control and H2O2 treated rice samples.
2010-08-15 | E-GEOD-23217 | biostudies-arrayexpress
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2015-05-31 | GSE63367 | GEO
Project description:Small RNAs (21-24 nt) are involved in gene regulation through translation inhibition, mRNA cleavage, or directing chromatin modifications. In rice, currently ~240 miRNAs have been annotated. We sequenced more than four million small RNAs from rice and identified another 24 miRNA genes. Among these, we found a novel class of miRNAs that derive from natural cis-antisense transcript pairs. This configuration generates miRNAs that can perfectly match their targets. We provide evidence that the miRNAs function by inducing mRNA cleavage in the middle of their complementary site. Their production requires DCL1 activity, which is essential for canonical miRNA biogenesis. All of the nat-miRNAs identified in this study have large introns in their precursors that appear critical for nat-miRNA evolution and for the formation of functional miRNA loci. These findings suggest that other natural cis-antisense loci with similar exon-intron arrangements could be another source of miRNA genes Six rice samples are included in this study. They are 1) immature panicles, 2) germinating seedlings (control for Magnaporthe treatment), 3) germinating seedlings infected with Magnaporthe grisea,4)stems, 5) three-week-old seedlings (control for ABA treatment), 6) three-week-old seedlings treated with ABA.
2008-02-14 | E-GEOD-10523 | biostudies-arrayexpress
Project description:Endogenous small RNAs, including microRNAs (miRNAs) and short-interfering RNAs (siRNAs), function as posttranscriptional or transcriptional regulators in plants. miRNA function is essential for normal development and therefore likely to be important in the growth of the rice grain. To investigate the likely roles of miRNAs in rice grain development we carried out deep sequencing of the small RNA populations of rice grains. A total of 96,091 (including 23,867 reads from vegetative tissues) and 5,379,724 small RNA sequences that are longer than 17nt were generated. Approximately 94% of these small RNAs were 20-24nt in length. The majority of the small RNAs were singletons, indicating that rice genome has a very complex small RNA population, which is harder to be saturated. From these smal RNA sequences we found representatives of all 20 conserved plant miRNA families and evidence for changes in expression of miRNAs during rice grain development. Using an approach based on the presence of the miRNA and miRNA* sequences, we identified 51 novel, non-conserved rice miRNA families expressed in grains with functionally diverse predicted target genes. miRNA-guided cleavage was confirmed for a number of targets genes including ones with roles in sugar signalling and restoration of cytoplasmic male sterility. We identified a likely mirtron, indicating that plants can also use spliced introns as a source of miRNAs. Our sequencing results revealed four TAS3 loci; these all contain dual miR390 sites of which only the 3? site is cleaved. We also found a miRNA-like long hairpin generating phased 21nt small RNAs, strongly expressed in developing grains and show that these small RNAs act in trans to cleave target mRNAs. Keywords: high throughput pyrosequencing, small RNA, microRNA, grain development, rice Small RNA populations of shoots and roots of 7 days old seedlings, and 1-5 and 6-10 days after fertilization grains were determined using high throughput sequencing technology. The abundance of known miRNAs were compared based on the number of sequence reads. To give a whole picture of the rice small RNA populations and to reflect un-biasly the sequencing results, small RNAs that are longer than 17nt no matter whether or not they matched with the rice genome were included in this submitted dataset. The unmatched sequences may be derived from un-sequenced regions or sequencing errors.
2008-08-21 | E-GEOD-11014 | biostudies-arrayexpress
Project description:MicroRNA (miRNA)-guided target RNA expression is vital for a wide variety of biological processes in eukaryotes. The integration of miRNAs in diverse biological networks relies upon the confirmation of their RNA targets. Most miRNA targets in Arabidopsis are validated, but those in rice are yet to be characterized. To identify transcriptome-wide small RNA targets in rice, we generated 20-nt small cDNA library and obtained nearly 40 million reads. Sequence analysis yielded 11,552,007 unique reads that can be perfectly mapped to the rice genome. Sequence analysis not only found homologous targets for conserved miRNAs but also many novel targets. Besides miRNA atregts, the rice degradome contained fragments derived from MIRNA precursors. A closer inspection of these fragments revealed a unique pattern distinct from siRNA producing loci. This attribute can serve as one of the ancillary criteria for separating miRNAs from siRNAs in plants. Keywords: high throughout sequencing of rice degradome Identify transcriptome-wide small RNA targets in rice
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Project description:Small RNAs (21-24 nt) are involved in gene regulation through translation inhibition, mRNA cleavage, or directing chromatin modifications. In rice, currently ~240 miRNAs have been annotated. We sequenced more than four million small RNAs from rice and identified another 24 miRNA genes. Among these, we found a novel class of miRNAs that derive from natural cis-antisense transcript pairs. This configuration generates miRNAs that can perfectly match their targets. We provide evidence that the miRNAs function by inducing mRNA cleavage in the middle of their complementary site. Their production requires DCL1 activity, which is essential for canonical miRNA biogenesis. All of the nat-miRNAs identified in this study have large introns in their precursors that appear critical for nat-miRNA evolution and for the formation of functional miRNA loci. These findings suggest that other natural cis-antisense loci with similar exon-intron arrangements could be another source of miRNA genes Keywords: small RNA sequencing by MPSS
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Project description:In order to identify new miRNAs, NAT-siRNAs and possibly abiotic-stress regulated small RNAs in rice, three small RNA libraries were constructed from control rice seedlings and seedlings exposed to drought or salt stress, and then subjected to pyrosequencing.
2008-12-08 | GSE12317 | GEO
Project description:The lack of MIRNA set and genome sequence of O. rufipogon (the ancestor of the cultivated rice) has limited to answer the role of MIRNA genes in rice domestication.In this study, a genome, three small RNA populations and a degradome of O.rufipogon were sequenced by Illumina platform and miRNA expression were investigated by miRNA chips. A de novo genome was assembled using ~55x coverage of raw sequencing data and a total of 387 MIRNAs were identified in the O. rufipogon genome based on ~5.2 million unique small RNA reads from three different tissues of O. rufipogon. Of these O. rufipogon MIRNAs, 259 were not found in the cultivated rice, suggesting loss of these MIRNAs in the cultivated rice. We also found that 48 MIRNAs were novel in the cultivated rice, suggesting that they were potential targets of domestication selection. Some miRNAs showed significant expression difference in the wild and cultivated rice, suggesting that expression of miRNA could also be a target of domestication, as demonstrated for the miR164 family. Our results illustrated MIRNA genes, like protein-coding genes, were significantly shaped during rice domestication and could be one of the driven forces contributed to rice domestication. The 5' end of the 3' degraded mRNAs with polyA tails were collected and generated from seedlings at four-leaves stage of O.rufipogon by degradome highthoughput sequecing using Illumina GAII
2012-08-10 | E-GEOD-39307 | biostudies-arrayexpress
Project description:MicroRNA (miRNA)-guided target RNA expression is vital for a wide variety of biological processes in eukaryotes. The integration of miRNAs in diverse biological networks relies upon the confirmation of their RNA targets. Most miRNA targets in Arabidopsis are validated, but those in rice are yet to be characterized. To identify transcriptome-wide small RNA targets in rice, we generated 20-nt small cDNA library and obtained nearly 40 million reads. Sequence analysis yielded 11,552,007 unique reads that can be perfectly mapped to the rice genome. Sequence analysis not only found homologous targets for conserved miRNAs but also many novel targets. Besides miRNA atregts, the rice degradome contained fragments derived from MIRNA precursors. A closer inspection of these fragments revealed a unique pattern distinct from siRNA producing loci. This attribute can serve as one of the ancillary criteria for separating miRNAs from siRNAs in plants. Keywords: high throughout sequencing of rice degradome
2010-05-04 | GSE17398 | GEO
Project description:Endogenous small RNAs, including microRNAs (miRNAs) and short-interfering RNAs (siRNAs), function as posttranscriptional or transcriptional regulators in plants. miRNA function is essential for normal development and therefore likely to be important in the growth of the rice grain. To investigate the likely roles of miRNAs in rice grain development we carried out deep sequencing of the small RNA populations of rice grains. A total of 96,091 (including 23,867 reads from vegetative tissues) and 5,379,724 small RNA sequences that are longer than 17nt were generated. Approximately 94% of these small RNAs were 20-24nt in length. The majority of the small RNAs were singletons, indicating that rice genome has a very complex small RNA population, which is harder to be saturated. From these smal RNA sequences we found representatives of all 20 conserved plant miRNA families and evidence for changes in expression of miRNAs during rice grain development. Using an approach based on the presence of the miRNA and miRNA* sequences, we identified 51 novel, non-conserved rice miRNA families expressed in grains with functionally diverse predicted target genes. miRNA-guided cleavage was confirmed for a number of targets genes including ones with roles in sugar signalling and restoration of cytoplasmic male sterility. We identified a likely mirtron, indicating that plants can also use spliced introns as a source of miRNAs. Our sequencing results revealed four TAS3 loci; these all contain dual miR390 sites of which only the 3? site is cleaved. We also found a miRNA-like long hairpin generating phased 21nt small RNAs, strongly expressed in developing grains and show that these small RNAs act in trans to cleave target mRNAs. Keywords: high throughput pyrosequencing, small RNA, microRNA, grain development, rice
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