22-nucleotide siRNAs mediate translational repression and trigger a silencing storm
Ontology highlight
ABSTRACT:
PROVIDER: PRJNA624860 | ENA |
REPOSITORIES: ENA
Dataset's files
| Action | DRS | |||
|---|---|---|---|---|
| SRR11539100.fastq.gz | Fastqsanger.gz | |||
| SRR11539083.fastq.gz | Fastqsanger.gz | |||
| SRR11539084.fastq.gz | Fastqsanger.gz | |||
| SRR11539085.fastq.gz | Fastqsanger.gz | |||
| SRR11539086.fastq.gz | Fastqsanger.gz |
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Project description:22-nucleotide siRNAs mediate translational repression and trigger a silencing storm [es]
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Project description:Small interfering RNAs (siRNAs) are critical for proper development and immunity in eukaryotes1. Plants produce siRNAs with lengths of 21-, 22-, or 24- nucleotides (nt), wherein the 21- and 24-nt siRNAs mediate mRNA cleavage and DNA methylation2,3, respectively. However, the biological functions of 22-nt siRNAs remain elusive. Here we report the identification and characterization of a group of endogenous 22-nt siRNAs generated from the action of DICER-LIKE 2 (DCL2). When cytoplasmic RNA decay and DCL4 are deficient, the massive accumulation of 22-nt siRNAs causes pleiotropic growth disorders, including severe dwarfism, meristem defect, and pigmentation. Notably, two genes that encode nitrate reductases, NIA1 and NIA2, produce nearly half of the total of 22-nt siRNAs. Production of 22-nt siRNA triggers explosive self-amplification that leads to a small RNA storm, and induces dramatic translational repression both gene-specifically and globally. 22-nt siRNAs are also found to preferentially accumulate upon nitrogen deficiency, which acts to restrain plant growth and promote stress responses. Thus, our research uncovers the unique properties of 22-nt siRNAs, a previously unexplored class of plant siRNAs, and highlights the length of small RNA as a major functional determinant.
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Project description:Small interfering RNAs (siRNAs) are critical for proper development and immunity in eukaryotes1. Plants produce siRNAs with lengths of 21-, 22-, or 24- nucleotides (nt), wherein the 21- and 24-nt siRNAs mediate mRNA cleavage and DNA methylation2,3, respectively. However, the biological functions of 22-nt siRNAs remain elusive. Here we report the identification and characterization of a group of endogenous 22-nt siRNAs generated from the action of DICER-LIKE 2 (DCL2). When cytoplasmic RNA decay and DCL4 are deficient, the massive accumulation of 22-nt siRNAs causes pleiotropic growth disorders, including severe dwarfism, meristem defect, and pigmentation. Notably, two genes that encode nitrate reductases, NIA1 and NIA2, produce nearly half of the total of 22-nt siRNAs. Production of 22-nt siRNA triggers explosive self-amplification that leads to a small RNA storm, and induces dramatic translational repression both gene-specifically and globally. 22-nt siRNAs are also found to preferentially accumulate upon nitrogen deficiency, which acts to restrain plant growth and promote stress responses. Thus, our research uncovers the unique properties of 22-nt siRNAs, a previously unexplored class of plant siRNAs, and highlights the length of small RNA as a major functional determinant.
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Project description:Small interfering RNAs (siRNAs) are critical for proper development and immunity in eukaryotes1. Plants produce siRNAs with lengths of 21-, 22-, or 24- nucleotides (nt), wherein the 21- and 24-nt siRNAs mediate mRNA cleavage and DNA methylation2,3, respectively. However, the biological functions of 22-nt siRNAs remain elusive. Here we report the identification and characterization of a group of endogenous 22-nt siRNAs generated from the action of DICER-LIKE 2 (DCL2). When cytoplasmic RNA decay and DCL4 are deficient, the massive accumulation of 22-nt siRNAs causes pleiotropic growth disorders, including severe dwarfism, meristem defect, and pigmentation. Notably, two genes that encode nitrate reductases, NIA1 and NIA2, produce nearly half of the total of 22-nt siRNAs. Production of 22-nt siRNA triggers explosive self-amplification that leads to a small RNA storm, and induces dramatic translational repression both gene-specifically and globally. 22-nt siRNAs are also found to preferentially accumulate upon nitrogen deficiency, which acts to restrain plant growth and promote stress responses. Thus, our research uncovers the unique properties of 22-nt siRNAs, a previously unexplored class of plant siRNAs, and highlights the length of small RNA as a major functional determinant.
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Project description:Small interfering RNAs (siRNAs) are critical for proper development and immunity in eukaryotes1. Plants produce siRNAs with lengths of 21-, 22-, or 24- nucleotides (nt), wherein the 21- and 24-nt siRNAs mediate mRNA cleavage and DNA methylation2,3, respectively. However, the biological functions of 22-nt siRNAs remain elusive. Here we report the identification and characterization of a group of endogenous 22-nt siRNAs generated from the action of DICER-LIKE 2 (DCL2). When cytoplasmic RNA decay and DCL4 are deficient, the massive accumulation of 22-nt siRNAs causes pleiotropic growth disorders, including severe dwarfism, meristem defect, and pigmentation. Notably, two genes that encode nitrate reductases, NIA1 and NIA2, produce nearly half of the total of 22-nt siRNAs. Production of 22-nt siRNA triggers explosive self-amplification that leads to a small RNA storm, and induces dramatic translational repression both gene-specifically and globally. 22-nt siRNAs are also found to preferentially accumulate upon nitrogen deficiency, which acts to restrain plant growth and promote stress responses. Thus, our research uncovers the unique properties of 22-nt siRNAs, a previously unexplored class of plant siRNAs, and highlights the length of small RNA as a major functional determinant.
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Project description:Small interfering RNAs (siRNAs) are critical for proper development and immunity in eukaryotes1. Plants produce siRNAs with lengths of 21-, 22-, or 24- nucleotides (nt), wherein the 21- and 24-nt siRNAs mediate mRNA cleavage and DNA methylation2,3, respectively. However, the biological functions of 22-nt siRNAs remain elusive. Here we report the identification and characterization of a group of endogenous 22-nt siRNAs generated from the action of DICER-LIKE 2 (DCL2). When cytoplasmic RNA decay and DCL4 are deficient, the massive accumulation of 22-nt siRNAs causes pleiotropic growth disorders, including severe dwarfism, meristem defect, and pigmentation. Notably, two genes that encode nitrate reductases, NIA1 and NIA2, produce nearly half of the total of 22-nt siRNAs. Production of 22-nt siRNA triggers explosive self-amplification that leads to a small RNA storm, and induces dramatic translational repression both gene-specifically and globally. 22-nt siRNAs are also found to preferentially accumulate upon nitrogen deficiency, which acts to restrain plant growth and promote stress responses. Thus, our research uncovers the unique properties of 22-nt siRNAs, a previously unexplored class of plant siRNAs, and highlights the length of small RNA as a major functional determinant.
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Project description:Trans-acting siRNAs (tasiRNAs) negatively regulate target transcripts and are characterized by siRNAs spaced in 21-nucleotide 'phased' intervals. TasiRNAs have not been extensively described in many plant species. We identified dozens of new miRNAs in Medicago and soybean and confirmed 119 Medicago targets. A search for phased tasiRNA-like small RNAs ('phasiRNAs') found at least 114 Medicago loci, the majority of which were NB-LRR encoding genes. Notably, conserved domains in NB-LRR-encoding RNAs are targeted by several 22-nt miRNA families to trigger phasiRNA production. DCL2 and SGS3 transcripts were also cleaved by these 22-nt miRNAs, generating phased small RNAs, suggesting synchronization between silencing and pathogen defense pathways. A second example of 'two-hit' phasiRNA processing was identified, utilizing miR156-miR172 sites. Our data illustrate a complex tasiRNA-mediated regulatory circuit that potentially modulates plant-microbe interactions. A few miRNA triggers regulate an extremely large gene family by targeting highly conserved protein motif-encoding sequences, representing a new paradigm for miRNA function. Examination of different tissue types in legumes (Medicago, soybean, common bean, peanut) by high throughput sequencing for small RNA profiling
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