Apoptotic Microrna Decay
Apoptotic Microrna Decay - Related Videos
01:22
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MicroRNA (miRNA) are short, regulatory RNA transcribed from introns—non-coding regions of a gene—or intergenic regions—stretches of DNA present between genes. Several processing steps are required to form biologically active, mature miRNA. The initial transcript, called primary miRNA (pri-mRNA), base-pairs with itself forming a stem-loop structure. Within the nucleus, an endonuclease enzyme, called Drosha, shortens the stem-loop structure into hairpin-shaped pre-miRNA. After the pre-miRNA ends...
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Radioactivity is a spontaneous disintegration of an unstable nuclide and is a random process, as all the nuclei in the sample do not decay simultaneously. The number of disintegrations per unit time is called the activity (A), which is directly proportional to the number of nuclei in the sample. The decay constant (λ) is an average probability of decay per nucleus in unit time. The SI unit for activity is the becquerel, which is one disintegration per second. Another unit of activity is the...
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Nonsense-mediated mRNA Decay
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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. Usually, Upf3 binds to an Exon Junction Complex (EJC) at mRNA splice sites. If a ribosome fully translates the mRNA,...
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Analysis of Efferocytosis of Apoptotic Thymocytes by Peritoneal Macrophages
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This video demonstrates a procedure for analyzing peritoneal macrophage-mediated efferocytosis of apoptotic mouse thymocytes by fluorescence microscopy.
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Forgetting is a complex cognitive phenomenon influenced by several factors, among which interference and decay are particularly prominent. These processes explain why individuals often struggle to retrieve specific information from memory, leading to lapses in recall that can be observed in everyday situations. Interference occurs when competing memories hinder the retrieval of particular information. It can be classified into two types: proactive and retroactive interference. Proactive...
FAQs
Argonaute association helps stabilize mature microRNAs and supports their post-transcriptional regulatory activity. During apoptosis, weakened binding to Argonaute can make these molecules more vulnerable to destabilization or cleavage and can reduce repression of target messenger RNAs. This change links microRNA turnover with altered gene regulation as the cell progresses through programmed death.
RNA-binding proteins can affect whether mature microRNAs remain protected within regulatory complexes or become available for destabilization. Apoptotic remodeling may change the composition or behavior of these protein-microRNA assemblies, shifting microRNAs away from stable regulation. The resulting changes can influence which target messenger RNAs escape repression and when death-related gene expression changes become apparent.
Cellular nucleases are relevant because they can cleave RNA molecules whose stability has been altered during apoptosis. Their activity provides a possible molecular route from apoptotic remodeling to loss of mature microRNAs. Examining nuclease-associated changes therefore helps explain distinctive RNA profiles in dying cells and clarifies how microRNA abundance can decline during programmed cell death.
The effect depends on when mature microRNAs lose stability or regulatory activity relative to apoptotic progression. Reduced microRNA repression can permit target messenger RNAs to contribute to changing gene-expression patterns, potentially altering both the timing and extent of death-related responses. This makes microRNA decay a regulatory event that may shape, rather than merely reflect, cellular remodeling.
A useful investigation considers mature microRNA abundance together with Argonaute association, RNA-binding protein changes, and nuclease-related destabilization or cleavage. These features connect the observed RNA profile with possible mechanisms rather than treating reduced microRNA levels as an isolated finding. Comparing these molecular changes during apoptosis can help identify how post-transcriptional control is being reshaped.
Distinctive microRNA patterns in dying cells may provide information about tissue injury, disease progression, or treatment response. Because decay reflects changes in post-transcriptional regulation during apoptosis, researchers can investigate it as a source of molecular biomarkers while also using it to interpret cell-death-associated RNA profiles. Its value lies in connecting measurable RNA changes with the biological state of affected cells.