Domanda del libro di testo
RNAi may be directed by small interfering RNAs (siRNAs) or microRNAs (miRNAs); how are these similar, and how are they different?
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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 12
Klug 12th EditionCh. 18 - Post-transcriptional Regulation in EukaryotesProblema 12Capitolo 18, Problema 12
Present an overview of RNA interference (RNAi). How does the silencing process begin, and what major components participate?
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Begin by defining RNA interference (RNAi) as a biological process in which RNA molecules inhibit gene expression or translation by neutralizing targeted mRNA molecules, effectively silencing specific genes.
Explain that the silencing process starts when double-stranded RNA (dsRNA) enters the cell or is produced within the cell, which is recognized as a trigger for RNAi.
Describe how the enzyme Dicer, a ribonuclease III family member, cleaves the long dsRNA into small interfering RNAs (siRNAs) of about 21-23 nucleotides in length.
Detail that these siRNAs are then incorporated into the RNA-induced silencing complex (RISC), where one strand (the guide strand) is retained and the other (the passenger strand) is degraded.
Clarify that the RISC uses the guide strand to recognize complementary mRNA sequences, leading to the cleavage and degradation of the target mRNA, thereby preventing its translation and silencing the gene.
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RNA Interference (RNAi) Mechanism
RNA interference is a biological process where small RNA molecules inhibit gene expression by neutralizing targeted mRNA molecules. It serves as a regulatory mechanism to control gene activity and defend against viral genomes or transposons.
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06:59
RNA Interference
Initiation of RNAi Silencing
The silencing process begins when double-stranded RNA (dsRNA) is recognized and cleaved by the enzyme Dicer into small interfering RNAs (siRNAs). These siRNAs guide the RNA-induced silencing complex (RISC) to complementary mRNA targets for degradation.
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07:58Translation initiation
Major Components of RNAi
Key components include Dicer, which processes dsRNA into siRNAs; Argonaute proteins within the RISC complex, which bind siRNAs and mediate mRNA cleavage; and the siRNAs themselves, which provide sequence specificity for targeting mRNA.
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06:25DNA Structure
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Domanda del libro di testo
In 1998, future Nobel laureates Andrew Fire and Craig Mello, and colleagues, published an article in Nature entitled, 'Potent and Specific Genetic Interference by Double-Stranded RNA in Caenorhabditis elegans.' Explain how RNAi is both 'potent and specific.'
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Domanda del libro di testo
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?
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Domanda del libro di testo
In principle, RNAi may be used to fight viral infection. How might this work?
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Domanda del libro di testo
What are processing bodies (P bodies), and what role do they play in mRNA regulation?
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Domanda del libro di testo
miRNAs target endogenous mRNAs in a sequence-specific manner. Explain, conceptually, how one might identify potential mRNA targets for a given miRNA if you only know the sequence of the miRNA and the sequence of all mRNAs in a cell or tissue of interest.
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