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Transfer RNA acetylation regulates in vivo mammalian stress signaling [tissues]

ABSTRACT: Transfer RNA acetylation regulates in vivo mammalian stress signaling [tissues]

PROVIDER: PRJNA1198508 | ENA |

REPOSITORIES: ENA

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			Action	DRS
	SRR31721200_1.fastq.gz	Fastqsanger.gz
	SRR31721200_2.fastq.gz	Fastqsanger.gz
	SRR31721201_1.fastq.gz	Fastqsanger.gz
	SRR31721201_2.fastq.gz	Fastqsanger.gz
	SRR31721202_1.fastq.gz	Fastqsanger.gz

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Transfer RNA acetylation regulates in vivo mammalian stress signaling

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Transfer RNA acetylation regulates in vivo mammalian stress signaling [tissues]

Project description:Transfer RNA (tRNA) modifications are crucial for protein synthesis, but their position-specific physiological roles remain poorly understood. Here, we investigate the impact of N4-acetylcytidine (ac4C), a highly conserved tRNA modification catalyzed by the essential acetyltransferase Nat10. By targeting Thumpd1, a nonessential adapter protein required for Nat10-catalyzed tRNA acetylation, we determine that loss of tRNA acetylation leads to reduced levels of tRNALeu, increased ribosome stalling, and activation of eIF2α phosphorylation. Thumpd1 knockout mice exhibit growth defects and sterility. Concurrent knockout of Thumpd1 and the stress-sensing kinase Gcn2 causes penetrant postnatal lethality in mice, indicating a critical genetic interaction. Our findings demonstrate that a modification restricted to a single position within type II cytosolic tRNAs can regulate ribosome-mediated stress signaling in mammalian organisms, with implications for our understanding of translational control and therapeutic interventions.

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Project description:Transfer RNA (tRNA) modifications are crucial for protein synthesis, but their physiological roles remain poorly understood. Here we investigate the impact of N4-acetylcytidine (ac4C), a highly conserved tRNA modification, using a Thumpd1 knockout mouse model. We find that loss of Thumpd1-dependent tRNA acetylation leads to reduced levels of tRNALeu, increased ribosome stalling and collisions, and activation of eIF2α phosphorylation. Thumpd1 knockout mice exhibit growth defects and sterility. Remarkably, concurrent knockout of Thumpd1 and the stress-sensing kinase Gcn2 causes penetrant postnatal lethality, revealing a critical genetic interaction. Our findings demonstrate that a modification restricted to a single site within type II cytosolic tRNAs can regulate ribosome-mediated signaling in mammalian organisms. By providing insight into how tRNA modifications shape signaling and cell fate in response to stress, this work opens up novel strategies for therapeutic intervention and translational control.

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Project description:Transfer RNA (tRNA) modifications are crucial for protein synthesis, but their physiological roles remain poorly understood. Here we investigate the impact of N4-acetylcytidine (ac4C), a highly conserved tRNA modification, using a Thumpd1 knockout mouse model. We find that loss of Thumpd1-dependent tRNA acetylation leads to reduced levels of tRNALeu, increased ribosome stalling, and activation of eIF2-alpha phosphorylation. Thumpd1 knockout mice exhibit growth defects and sterility. Remarkably, concurrent knockout of Thumpd1 and the stress-sensing kinase Gcn2 causes penetrant postnatal lethality, revealing a critical genetic interaction. Our findings demonstrate that a modification restricted to a single position within type II cytosolic tRNAs can regulate ribosome-mediated signaling in mammalian organisms. Insights into how tRNA modifications shape phenotype and signaling in response to stress provide a foundation for novel strategies for therapeutic intervention and translational control.

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