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Related Concept Videos

Alternative RNA Splicing02:18

Alternative RNA Splicing

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Alternative RNA splicing is the regulated splicing of exons and introns to produce different mature mRNAs from a single pre-mRNA. Unlike in constitutive splicing where a single gene produces a single type of mRNA, alternative splicing allows an organism to produce multiple proteins from a single gene and plays an important role in protein diversity.
There are five types of alternative RNA splicing that vary in the ways the pre-mRNA segments are removed or retained in the mature mRNA. The first...
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Splicing is the process by which eukaryotic RNA is edited before its translation into protein. The RNA strand transcribed from eukaryotic DNA is called the primary transcript. The primary transcripts that become mRNAs are called precursor messenger RNAs (pre-mRNAs). Eukaryotic pre-mRNA contains alternating sequences of exons and introns. Exons are nucleotide sequences that code for proteins, whereas introns are the non-coding regions. In RNA splicing, introns are removed and exons are bonded...
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Overview
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Types of RNA01:20

Types of RNA

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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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RNA Stability01:53

RNA Stability

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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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Translation01:31

Translation

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Translation is the process of synthesizing proteins from the genetic information carried by messenger RNA (mRNA). Following transcription, it constitutes the final step in the expression of genes. This process is carried out by ribosomes, complexes of protein and specialized RNA molecules. Ribosomes, transfer RNA (tRNA), and other proteins produce a chain of amino acids—the polypeptide—as the end product of translation.
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Updated: May 17, 2025

A Reporter Based Cellular Assay for Monitoring Splicing Efficiency
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U2-2 snRNA Mutations Alter the Transcriptome.

Zhongxuan Chi, Varun Gupta, Charles Query

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    Summary
    This summary is machine-generated.

    Mutations in U2-2 small nuclear RNA (snRNA) impact gene expression and splicing. Reduced U2-2 levels, like in knockout cells, significantly alter the transcriptome, influencing RNA processing pathways.

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    Area of Science:

    • Molecular Biology
    • Genetics
    • RNA Biology

    Background:

    • The spliceosome, crucial for intron removal from pre-mRNA, is composed of snRNPs containing snRNAs.
    • U2 snRNA plays a vital role in splicing through RNA-RNA and RNA-protein interactions.
    • Mutations in U2 snRNA, especially at C28, are associated with cancer development.

    Purpose of the Study:

    • To investigate gene expression alterations caused by U2-2 snRNA mutations.
    • To compare the effects of U2-2 mutations versus U2-2 levels on splicing and gene expression.

    Main Methods:

    • Construction of U2-2 C28 mutant, knockout (KO), and overexpression (OE) cell lines.
    • RNA sequencing to analyze global gene expression changes.
    • Analysis of splicing patterns and differentially expressed genes.

    Main Results:

    • Knocking out U2-2 snRNA led to significant splicing changes and altered expression of over 4,000 genes.
    • Gene expression pathways related to RNA processing and non-coding RNAs were notably enriched.
    • Splicing patterns were more sensitive to U2-2 dosage than to mutations alone.

    Conclusions:

    • U2-2 snRNA mutations and altered levels significantly impact splicing and the transcriptome.
    • U2-2 knockout largely mimics the splicing alterations observed in U2-2 mutants.
    • Both U2-2 levels and specific mutations contribute to altered splicing, with many events potentially leading to nonsense-mediated decay (NMD).