Domanda del libro di testo
The regulation of mRNA decay relies heavily upon deadenylases and decapping enzymes. Explain how these classes of enzymes are critical to initiating mRNA decay.
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Ch. 18 - Post-transcriptional Regulation in Eukaryotes
Klug12th EditionConcepts of GeneticsISBN: 9780135564776
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TOC.tableOfContents
- Ch. 1 - Introduction to Genetics17
- Ch. 2 - Mitosis and Meiosis36
- Ch. 3 - Mendelian Genetics51
- Ch. 4 - Extensions of Mendelian Genetics74
- Ch. 5 - Chromosome Mapping in Eukaryotes51
- Ch. 6 - Genetic Analysis and Mapping in Bacteria and Bacteriophages46
- Ch. 7 - Sex Determination and Sex Chromosomes33
- Ch. 8 - Chromosome Mutations: Variation in Number and Arrangement40
- Ch. 9 - Extranuclear Inheritance31
- Ch. 10 - DNA Structure and Analysis43
- Ch. 11 - DNA Replication and Recombination44
- Ch. 12 - DNA Organization in Chromosomes30
- Ch. 13 - The Genetic Code and Transcription54
- Ch. 14 - Translation and Proteins47
- Ch. 15 - Gene Mutation, DNA Repair, and Transposition41
- Ch. 16 - Regulation of Gene Expression in Bacteria29
- Ch. 17 - Transcriptional Regulation in Eukaryotes41
- Ch. 18 - Post-transcriptional Regulation in Eukaryotes33
- Ch. 19 - Epigenetics33
- Ch. 20 - Recombinant DNA Technology44
- Ch. 21 - Genomic Analysis36
- Ch. 22 - Applications of Genetic Engineering and Biotechnology36
- Ch. 23 - Developmental Genetics37
- Ch. 24 - Cancer Genetics34
- Ch. 25 - Quantitative Genetics and Multifactorial Traits54
- Ch. 26 - Population and Evolutionary Genetics45
Klug12th EditionConcepts of GeneticsISBN: 9780135564776Non è quello che usi tu?Cambia libro di testo
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Klug 12th EditionCh. 18 - Post-transcriptional Regulation in EukaryotesProblema 9
Klug 12th EditionCh. 18 - Post-transcriptional Regulation in EukaryotesProblema 9Capitolo 18, Problema 9
AU-rich elements (AREs) are cis-elements in mRNAs that regulate stability and decay. How is it possible that a single mRNA sequence element can serve to stabilize an mRNA in some cases and lead to its decay in other scenarios?
Guida verificata passo dopo passo1
Understand that AU-rich elements (AREs) are specific sequences found in the 3' untranslated region (3' UTR) of mRNAs that influence mRNA stability by interacting with various RNA-binding proteins.
Recognize that the effect of an ARE on mRNA stability depends on which proteins bind to it; some proteins promote mRNA decay, while others protect the mRNA from degradation.
Consider that the cellular context, such as the type of cell, developmental stage, or external signals, can influence which RNA-binding proteins are present and active, thereby altering the outcome of ARE binding.
Acknowledge that post-translational modifications of RNA-binding proteins or changes in their expression levels can switch the function of AREs from stabilizing to destabilizing the mRNA or vice versa.
Summarize that the dual role of AREs arises from their ability to serve as binding platforms for different regulatory proteins whose presence and activity vary depending on cellular conditions, leading to either mRNA stabilization or decay.
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AU-rich Elements (AREs) in mRNA
AU-rich elements are specific sequences found in the 3' untranslated region of many mRNAs. They act as regulatory signals that influence mRNA stability by interacting with various RNA-binding proteins, thereby controlling the mRNA's lifespan and translation efficiency.
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03:08
Drosophila P Element
RNA-binding Proteins and Their Dual Roles
Different RNA-binding proteins can recognize the same ARE sequence but have opposing effects. Some proteins promote mRNA decay by recruiting degradation machinery, while others stabilize the mRNA by protecting it from nucleases, allowing the same ARE to mediate different outcomes depending on the bound factors.
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Context-dependent Regulation of mRNA Stability
The effect of AREs on mRNA stability depends on cellular conditions, such as signaling pathways, cell type, or stress responses. These contexts influence which RNA-binding proteins are expressed or activated, thus determining whether the ARE leads to mRNA stabilization or decay.
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09:22Review of Regulation
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