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Nonsense-mediated mRNA Decay

Nonsense-mediated mRNA Decay

The Upf proteins that carry out nonsense-mediated decay (NMD) are found in all eukaryotic organisms, including humans. Each protein has an individual role, but they need to work in collaboration. Upf1 is an ATP-dependent RNA helicase that unwinds the RNA helix. Because Upf1 can unwind any RNA, Upf2 and Upf3 are required to help Upf1 discriminate between nonsense and normal mRNAs.
Usually, Upf3 binds to an Exon Junction Complex (EJC) at mRNA splice sites. If a ribosome fully translates the mRNA,...

Nonsense-mediated mRNA Decay

Nonsense-mediated mRNA Decay

Nuclear Export of mRNA

Nuclear Export of mRNA

Before mRNAs are exported to the cytoplasm, it is crucial to check each mRNA for structural and functional integrity. Eukaryotic cells use several different mechanisms, collectively known as mRNA surveillance, to look for irregularities in mRNAs. Irregular or aberrant mRNA are rapidly degraded by various enzymes. If a defective mRNA escapes the surveillance, it would be translated into a protein which would either be non-functional or not function properly. One of the primary irregularities in...

Nuclear Export of mRNA

Nuclear Export of mRNA

mRNA Stability and Gene Expression

mRNA Stability and Gene Expression

The structure and stability of mRNA molecules regulates gene expression, as mRNAs are a key step in the pathway from gene to protein. In eukaryotes, the half-life of mRNA varies from a few minutes up to several days. mRNA stability is essential in growth and development. The absence of the proteins regulating its stability, such as tristetraprolin in mice, can cause systemic issues, including bone marrow overgrowth, inflammation, and autoimmunity.
Cis-acting Elements involved in mRNA stability

mRNA Stability and Gene Expression

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Lipid Supplementation for Longevity and Gene Transcriptional Analysis in Caenorhabditis elegans

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Published on: December 9, 2022

Longevity regulation by NMD-mediated mRNA quality control.

Heehwa G Son¹, Seung-Jae V Lee²

¹Department of Life Sciences, Pohang University of Science and Technology, Pohang 37673, Korea.

|March 15, 2017

Summary

Nonsense-mediated mRNA decay (NMD) enhances RNA quality control and promotes longevity in C. elegans. Reduced insulin/IGF-1 signaling increases NMD activity, suggesting conserved RNA quality mechanisms contribute to healthy aging.

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Published on: June 29, 2018

Area of Science:

Molecular Biology
Genetics
Aging Research

Background:

Homeostatic maintenance of DNA and proteins is vital for healthy aging.
The role of RNA maintenance systems, particularly nonsense-mediated mRNA decay (NMD), in longevity is largely unexplored.
Understanding RNA quality control is crucial for aging research.

Purpose of the Study:

To investigate the role of nonsense-mediated mRNA decay (NMD) in promoting longevity.
To determine if NMD activity declines with age and impacts RNA quality.
To explore the relationship between insulin/IGF-1 signaling (IIS) and NMD in aging.

Main Methods:

Utilized the roundworm C. elegans as a model organism.
Assessed the activity of NMD during the aging process.
Examined the lifespan of C. elegans with altered NMD complex components.
Investigated NMD activity in animals with reduced insulin/IGF-1 signaling.

Main Results:

Nonsense-mediated mRNA decay (NMD) was found to enhance longevity by improving RNA quality control in C. elegans.
NMD activity decreases with age, suggesting a decline in RNA quality in older animals.
Key components of the NMD complex are essential for a prolonged lifespan.
Reduced insulin/IGF-1 signaling (IIS) correlates with increased NMD activity.

Conclusions:

Up-regulation of NMD plays a significant role in the longevity associated with reduced IIS by enhancing mRNA quality control.
The conserved nature of IIS and NMD pathways suggests that mammals, including humans, may possess similar RNA quality control mechanisms for longevity.
This study highlights the importance of RNA maintenance in the aging process and identifies NMD as a potential target for interventions promoting healthy aging.