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Related Concept Videos

Nuclear Export of mRNA02:31

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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...
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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.
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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.
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Intact DNA strands can be found in fossils, while scientists sometimes struggle to keep RNA intact under laboratory conditions. The structural variations between RNA and DNA underlie the differences in their stability and longevity. Because DNA is double-stranded, it is inherently more stable. The single-stranded structure of RNA is less stable but also more flexible and can form weak internal bonds. Additionally, most RNAs in the cell are relatively short, while DNA can be up to 250 million...
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Types of RNA01:20

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Three main types of RNA are involved in protein synthesis: messenger RNA (mRNA), transfer RNA (tRNA), and ribosomal RNA (rRNA). These RNAs perform diverse functions and can be broadly classified as protein-coding or non-coding RNA. Non-coding RNAs play important roles in regulating gene expression in response to developmental and environmental changes. Non-coding RNAs in prokaryotes can be manipulated to develop more effective antibacterial drugs for human or animal use.
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Regulation of Expression at Multiple Steps01:23

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The gene expression in cells is regulated at different stages: (i) transcription, (ii) RNA processing, (iii) RNA localization, and (iv) translation. Transcriptional regulation is mediated by regulatory proteins such as transcription factors, activators, or repressors—these control gene expression by initiating or inhibiting the transcription of genes. Once a precursor or pre-mRNA is produced, it undergoes post-transcriptional modification, including 5' capping, splicing, and the...
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Determining Genome-wide Transcript Decay Rates in Proliferating and Quiescent Human Fibroblasts
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A nuclear RNA degradation code for eukaryotic transcriptome surveillance.

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    Scientists discovered a new "nuclear RNA degradation code" (NRDC) that targets faulty RNAs for destruction. This code, involving splice sites and poly(A) junctions, helps prevent disease-associated errors in RNA processing.

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    Area of Science:

    • Molecular Biology
    • RNA Biology
    • Gene Regulation

    Background:

    • The RNA exosome is crucial for degrading RNA in eukaryotes, but its target recognition mechanism is not fully understood.
    • The PAXT adaptor protein links the RNA exosome to polyadenylated RNAs in the nucleus, particularly those with intronic polyadenylation signals.

    Purpose of the Study:

    • To elucidate the specific sequence requirements and molecular players involved in PAXT-mediated nuclear RNA degradation.
    • To identify and characterize a novel RNA degradation code that governs the recognition of aberrant transcripts.

    Main Methods:

    • Investigated the role of 5' splice sites and poly(A) junctions in recruiting PAXT and the RNA exosome.
    • Utilized biochemical assays and RNA-binding protein analyses to understand the interaction network.
    • Examined the impact of disease-associated genetic variations on this degradation pathway.

    Main Results:

    • PAXT-mediated RNA degradation requires the combined presence of a 5' splice site and a poly(A) junction, not either sequence alone.
    • U1 snRNP and cleavage/polyadenylation factors cooperatively bind these sequences and recruit PAXT.
    • This 5' splice site-poly(A) junction combination functions as a Nuclear RNA Degradation Code (NRDC).
    • Disease-associated SNPs creating 5' splice sites in 3' UTRs trigger aberrant mRNA degradation via the NRDC mechanism.

    Conclusions:

    • Identified the first Nuclear RNA Degradation Code (NRDC) and its recognition mechanism.
    • Demonstrated that the NRDC targets RNAs containing specific combinations of 5' splice sites and poly(A) junctions.
    • Established the role of the NRDC pathway in human diseases linked to aberrant RNA processing.