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Ribonuclease κ promotes longevity by preventing age-associated accumulation of circular RNA in stress granules [rnk-1]

ABSTRACT: Circular RNAs (circRNAs) accumulate with age, but their functional impact on aging remains elusive. In this study, we reveal a mechanism by which ribonuclease κ (RNASEK) prevents age-dependent circRNA accumulation by promoting its degradation. Through a genetic screen targeting ribonucleases, we identified RNASEK as a specific circRNA-cleaving ribonuclease. RNASEK is downregulated during aging, causing the age-dependent increase in circRNA levels. RNASEK is necessary and sufficient for lifespan extension and healthspan maintenance in Caenorhabditis elegans. Mammalian RNASEK also directly degrades circRNAs, and is required for preventing premature aging in cultured human cells and mice, indicating its evolutionarily conserved role. Notably, we demonstrate that circRNAs localize within stress granules, where RNASEK, in collaboration with HSP90, prevents toxic aggregation of circRNAs in aged organisms. Our study establishes RNASEK as a conserved regulator of aging and offers a framework for targeting circRNAs to mitigate age-associated diseases and to extend organismal healthspan.

ORGANISM(S): Caenorhabditis elegans

PROVIDER: GSE314234 | GEO | 2026/02/24

REPOSITORIES: GEO

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Ribonuclease κ promotes longevity by preventing age-associated accumulation of circular RNA in stress granules [rnk-1rnk-2_PARE]

Project description:Circular RNAs (circRNAs) accumulate with age, but their functional impact on aging remains elusive. In this study, we reveal a mechanism by which ribonuclease κ (RNASEK) prevents age-dependent circRNA accumulation by promoting its degradation. Through a genetic screen targeting ribonucleases, we identified RNASEK as a specific circRNA-cleaving ribonuclease. RNASEK is downregulated during aging, causing the age-dependent increase in circRNA levels. RNASEK is necessary and sufficient for lifespan extension and healthspan maintenance in Caenorhabditis elegans. Mammalian RNASEK also directly degrades circRNAs, and is required for preventing premature aging in cultured human cells and mice, indicating its evolutionarily conserved role. Notably, we demonstrate that circRNAs localize within stress granules, where RNASEK, in collaboration with HSP90, prevents toxic aggregation of circRNAs in aged organisms. Our study establishes RNASEK as a conserved regulator of aging and offers a framework for targeting circRNAs to mitigate age-associated diseases and to extend organismal healthspan.

2026-02-24 | GSE314237 | GEO

Ribonuclease κ promotes longevity by preventing age-associated accumulation of circular RNA in stress granules [rnk-1rnk-2]

2026-02-24 | GSE314236 | GEO

Synergistic degradation of circRNAs by RNase K and lysosomes

Project description:Circular RNAs (circRNAs) are vital in many physiological and pathological events. Compared to the other processes of circRNA metabolism, circRNA degradation is less understood. Through screening and further characterization, RNAseK and lysosome are identified as circRNA degradation modules in metazoan, and RNase 1 as a lysosomal circRNA endoribonuclease in mammal. RNAseK and lysosome function synergistically with RNAseK degrading circRNAs outside and lysosome degrading those inside of the organelle. Mutations of RNAseK- or lysosome-sensitive sites in in vitro synthesized circRNA reporters lead to higher expression levels, and simultaneous mutations of both sensitive sites result in further increase. Under stress stimuli such as heat shock and ER stress, significantly decreased global circRNA levels are observed in C. elegans. RNAseK deficiency or lysosome inhibition diminishes the decreases in circRNA levels, and impedes the induction of stress response, suggesting that circRNA degradation by RNAseK and lysosome plays protective roles in C. elegans stress response.

2026-03-01 | GSE288057 | GEO

Analysis of intron sequences reveals hallmarks of circular RNA biogenesis in animals

Project description:Circular RNAs (circRNAs) are a large class of animal RNAs. To investigate possible circRNA functions, it is important to understand circRNA biogenesis. Besides human Alu repeats, sequence features that promote exon circularization are largely unknown. We experimentally identified new circRNAs in C. elegans. Reverse complementary sequences between introns bracketing circRNAs were significantly enriched compared to linear controls. By scoring the presence of reverse complementary sequences in human introns we predicted and experimentally validated novel circRNAs. We show that introns bracketing circRNAs are highly enriched in RNA editing or hyper-editing events. Knockdown of the double-strand RNA editing ADAR1 enzyme significantly and specifically up-regulated circRNA expression. Together, our data support a model of animal circRNA biogenesis in which competing RNA:RNA interactions of introns form larger structures which promote circularization of embedded exons, while ADAR1 antagonizes circRNA expression by melting stems within these interactions. Thus, we assign a new function to ADAR1. Examination of 12 samples in different stages of C.elegans development.

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2018-11-26 | GSE94027 | GEO

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Project description:Circular RNAs (circRNAs) are an endogenous class of animal RNAs. Despite their abundance, their function and expression in the nervous system are unknown. Therefore, we sequenced RNA from different brain regions, primary neurons, isolated synapses, as well as during neuronal differentiation. Using these and other available data, we discovered and analyzed thousands of neuronal human and mouse circRNAs. circRNAs were extraordinarily enriched in the mammalian brain, well conserved in sequence, often expressed as circRNAs in both human and mouse, and sometimes even detected in Drosophila brains. circRNAs were overall upregulated during neuronal differentiation, highly enriched in synapses, and often differentially expressed compared to their mRNA isoforms. circRNA expression correlated negatively with expression of the RNA-editing enzyme ADAR1. Knockdown of ADAR1 induced elevated circRNA expression. Together, we provide a circRNA brain expression atlas and evidence for important circRNA functions and values as biomarkers. To assess circRNA expression in mammalian brain, we sequenced and analyzed mouse brain regions (hippocampus, cerebellum, prefrontal cortex and olfactory bulb), various neuronal differentiation (mouse P19 and human SH-SY5Y cells) and maturation (mouse cortical neurons) stages, and subcellular compartments in mouse (synaptoneurosomal fraction, cytoplasmic fraction, whole brain lysate).

2015-04-24 | E-GEOD-65926 | biostudies-arrayexpress

Structured elements drive circular RNA translation and expand the human proteome, part3

Project description:The human genome encodes tens of thousands circular RNAs (circRNAs) whose levels correlate with many disease states. While studies have focused on the non-coding functions of circRNAs, emerging evidence suggests that a handful of circRNAs encode proteins. Translation canonically starts by recognition of mRNA 5â€™cap and scanning to the start codon; how circRNA translation initiates remains unclear. Here, we developed a high-throughput screen to systematically identify and quantify RNA sequences that can direct circRNA translation. We identify and validate over 17,000 circRNA internal ribosome entry sites (IRES) and reveal that 18S rRNA complementarity and a structured RNA element on the IRES are important for facilitating circRNA cap-independent translation. With genomic and peptidomic analyses of the IRES, we identified nearly 1,000 putative endogenous protein-coding circRNAs and hundreds of translational units encoded by these circRNAs. We further characterized circFGFR1p, a protein encoded by circFGFR1, functions as a negative regulator of FGFR1 to suppress cell growth under stress conditions. The circRNA proteome may be important links among circRNA, biological control, and disease.

2021-08-25 | PXD025233 | Pride

Structured elements drive circular RNA translation and expand the human proteome, part4

Project description:The human genome encodes tens of thousands circular RNAs (circRNAs) whose levels correlate with many disease states. While studies have focused on the non-coding functions of circRNAs, emerging evidence suggests that a handful of circRNAs encode proteins. Translation canonically starts by recognition of mRNA 5’cap and scanning to the start codon; how circRNA translation initiates remains unclear. Here, we developed a high-throughput screen to systematically identify and quantify RNA sequences that can direct circRNA translation. We identify and validate over 17,000 circRNA internal ribosome entry sites (IRES) and reveal that 18S rRNA complementarity and a structured RNA element on the IRES are important for facilitating circRNA cap-independent translation. With genomic and peptidomic analyses of the IRES, we identified nearly 1,000 putative endogenous protein-coding circRNAs and hundreds of translational units encoded by these circRNAs. We further characterized circFGFR1p, a protein encoded by circFGFR1, functions as a negative regulator of FGFR1 to suppress cell growth under stress conditions. The circRNA proteome may be important links among circRNA, biological control, and disease.

2021-08-26 | PXD025203 | Pride

Structured elements drive circular RNA translation and expand the human proteome part2

Project description:The human genome encodes tens of thousands circular RNAs (circRNAs) whose levels correlate with many disease states. While studies have focused on the non-coding functions of circRNAs, emerging evidence suggests that a handful of circRNAs encode proteins. Translation canonically starts by recognition of mRNA 5’cap and scanning to the start codon; how circRNA translation initiates remains unclear. Here, we developed a high-throughput screen to systematically identify and quantify RNA sequences that can direct circRNA translation. We identify and validate over 17,000 circRNA internal ribosome entry sites (IRES) and reveal that 18S rRNA complementarity and a structured RNA element on the IRES are important for facilitating circRNA cap-independent translation. With genomic and peptidomic analyses of the IRES, we identified nearly 1,000 putative endogenous protein-coding circRNAs and hundreds of translational units encoded by these circRNAs. We further characterized circFGFR1p, a protein encoded by circFGFR1, functions as a negative regulator of FGFR1 to suppress cell growth under stress conditions. The circRNA proteome may be important links among circRNA, biological control, and disease.

2021-08-23 | PXD025235 | Pride

Structured elements drive circular RNA translation and expand the human proteome, part1

Project description:The human genome encodes tens of thousands circular RNAs (circRNAs) whose levels correlate with many disease states. While studies have focused on the non-coding functions of circRNAs, emerging evidence suggests that a handful of circRNAs encode proteins. Translation canonically starts by recognition of mRNA 5’cap and scanning to the start codon; how circRNA translation initiates remains unclear. Here, we developed a high-throughput screen to systematically identify and quantify RNA sequences that can direct circRNA translation. We identify and validate over 17,000 circRNA internal ribosome entry sites (IRES) and reveal that 18S rRNA complementarity and a structured RNA element on the IRES are important for facilitating circRNA cap-independent translation. With genomic and peptidomic analyses of the IRES, we identified nearly 1,000 putative endogenous protein-coding circRNAs and hundreds of translational units encoded by these circRNAs. We further characterized circFGFR1p, a protein encoded by circFGFR1, functions as a negative regulator of FGFR1 to suppress cell growth under stress conditions. The circRNA proteome may be important links among circRNA, biological control, and disease.

2021-08-23 | PXD024993 | Pride

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