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How do we know that microRNAs negatively regulate target mRNAs?
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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 2
Klug 12th EditionCh. 18 - Post-transcriptional Regulation in EukaryotesProblema 2Capitolo 18, Problema 2
Write a short essay describing how an mRNA may be regulated in three different ways by specific cis-elements and RBPs.
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Begin by defining key terms: explain that mRNA regulation involves controlling the stability, localization, and translation of messenger RNA molecules, and that cis-elements are specific sequences within the mRNA itself, while RNA-binding proteins (RBPs) are proteins that interact with these sequences to influence mRNA fate.
Describe the first way mRNA can be regulated: through cis-elements in the 5' untranslated region (5' UTR) that affect translation initiation. Explain how RBPs binding to these elements can either enhance or repress the recruitment of ribosomes, thus controlling protein synthesis.
Explain the second regulatory mechanism involving cis-elements in the 3' untranslated region (3' UTR), such as AU-rich elements (AREs), which influence mRNA stability. Discuss how RBPs binding to these elements can promote mRNA degradation or stabilization, thereby controlling mRNA half-life.
Discuss a third way mRNA regulation occurs via cis-elements that determine mRNA localization within the cell. Describe how RBPs recognize these localization signals and transport the mRNA to specific cellular compartments, ensuring spatial control of protein production.
Conclude by summarizing how the interplay between cis-elements and RBPs provides a versatile and dynamic system for post-transcriptional regulation of gene expression, allowing cells to respond rapidly to environmental and developmental cues.
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Cis-Elements in mRNA Regulation
Cis-elements are specific nucleotide sequences within an mRNA molecule that serve as binding sites for regulatory proteins or RNAs. These elements, such as the 5' UTR, 3' UTR, and intronic regions, influence mRNA stability, localization, and translation efficiency by interacting with trans-acting factors.
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06:38
Regulation
RNA-Binding Proteins (RBPs)
RBPs are proteins that specifically bind to cis-elements on mRNA to regulate its fate. They can modulate mRNA splicing, transport, stability, and translation by recognizing sequence or structural motifs, thereby controlling gene expression post-transcriptionally.
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05:05Proteins
Mechanisms of mRNA Regulation by Cis-Elements and RBPs
mRNA regulation occurs through mechanisms such as altering mRNA stability (e.g., by recruiting decay machinery), controlling translation initiation (e.g., blocking ribosome access), and directing subcellular localization (e.g., transporting mRNA to specific sites). These processes depend on the interaction between cis-elements and RBPs.
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06:38Regulation
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