Exon Junction Complex
Exon Junction Complex - Related Videos
06:10
A Fluorescence-based Exonuclease Assay to Characterize DmWRNexo, Orthologue of Human Progeroid WRN Exonuclease, and Its Application to Other Nucleases
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Cited by 4 •
2013
Exonucleases play critical roles in ensuring genome stability. Loss of WRN exonuclease function results in premature aging. Studying substrates and other requirements of the nuclease in vitro can help elucidate its role in vivo. Here we demonstrate a rapid and reproducible fluorescence-based assay to measure its nuclease activity.
10:40
Measuring Neuromuscular Junction Functionality
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Cited by 7 •
2017
A functional assessment of the neuromuscular junction (NMJ) can provide essential information on the communication between muscle and nerve. Here we describe a protocol to comprehensively evaluate both the NMJ and muscle functionality using two different muscle-nerve preparations, i.e. soleus-sciatic and diaphragm-phrenic.
01:11
P-N junction
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2024
A p-n junction is formed when p-type and n-type semiconductor materials are joined together. At the interface of the p-n junction, holes from the p-side and electrons from the n-side begin to diffuse into the opposite sides due to the concentration gradient. This diffusion of carriers leads to a region around the junction where there are no free charge carriers, known as the depletion region. The charge density within the depletion region for the n-side and p-side can be described by the...
01:19
The Neuromuscular Junction
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2024
The nervous system consists of complex motor neuron circuits, including upper motor neurons originating from the cerebral cortex and lower motor neurons starting in the spinal cord, coordinating both voluntary and involuntary movements. Among these, somatic motor neurons activate skeletal muscles and are classified into alpha, beta, and gamma types. Alpha neurons are vital for voluntary movement coordination, while gamma neurons adjust muscle spindle sensitivity, and the function of beta...
01:24
Adherens Junctions
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2023
Strong contact points between adjacent cells anchor them to each other, forming tissues. Such anchoring junctions are of two types – adherens junctions and desmosomes. Adherens junctions are abundant in tissues such as epithelium and endothelium, forming a continuous zone of adhesion called the adhesion belt. In other tissues, such as heart muscle, they appear as clusters, linking the cells to produce coordinated heart muscle contraction. Adherens Junctions are Dynamic The endothelial cells...
FAQs
During splicing, the EJC core components eIF4AIII, MAGOH, Y14, and MLN51 assemble at a defined position upstream of the splice junction. This placement creates a molecular platform that can recruit additional regulatory factors after splicing. Consequently, one RNA mark can connect the completed splicing event with later steps in mRNA handling, rather than acting only during intron removal.
Its defined position, about 20–24 nucleotides upstream of a splice junction, provides a consistent molecular reference on the processed mRNA. That placement helps preserve a physical connection between exon joining and downstream regulation. Because the complex remains associated near the boundary, researchers can relate its location to later effects on mRNA export, translation, localization, and surveillance.
The EJC is a protein-RNA assembly that can participate in several stages of mRNA regulation, whereas nonsense-mediated decay is a surveillance pathway that removes transcripts containing premature stop codons. The complex therefore should not be treated as synonymous with decay. Its broader regulatory reach includes export, translation, and localization, while its relationship with decay represents one specific functional connection.
Studies can examine whether EJC activity affects mRNA export from the nucleus, translation, intracellular localization, or removal through nonsense-mediated decay. Considering these outcomes together is important because the complex coordinates multiple stages of gene expression after transcription. This broader view helps distinguish a general disruption in mRNA handling from an effect limited to one downstream process.
The EJC contributes to the regulatory context in which nonsense-mediated decay operates, linking splicing-related information with surveillance of mRNA. When a transcript contains a premature stop codon, this pathway removes the faulty message. Examining the EJC in this setting helps researchers study how cells use information retained from splicing to influence the fate of potentially abnormal transcripts.
Disruptions in EJC formation or function may interfere with coordinated control of mRNA export, translation, localization, or nonsense-mediated decay. Such disturbances can alter how gene expression proceeds after transcription and may contribute to disease. Research on the complex therefore connects molecular events at exon boundaries with broader consequences for RNA metabolism and cellular regulation.