Domanda del libro di testo
Competing endogenous RNAs act as molecular 'sponges.' What does this mean, and what do they compete with?
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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 13
Klug 12th EditionCh. 18 - Post-transcriptional Regulation in EukaryotesProblema 13Capitolo 18, Problema 13
RNAi may be directed by small interfering RNAs (siRNAs) or microRNAs (miRNAs); how are these similar, and how are they different?
Guida verificata passo dopo passo1
Begin by defining both small interfering RNAs (siRNAs) and microRNAs (miRNAs) as short, non-coding RNA molecules involved in RNA interference (RNAi), a process that regulates gene expression post-transcriptionally.
Explain the similarity: both siRNAs and miRNAs guide the RNA-induced silencing complex (RISC) to target messenger RNAs (mRNAs) based on sequence complementarity, leading to gene silencing either by mRNA degradation or translational repression.
Describe the origin difference: siRNAs typically arise from exogenous double-stranded RNA (dsRNA) or long dsRNA precursors, while miRNAs are endogenously encoded in the genome and transcribed as primary miRNAs (pri-miRNAs) that are processed into mature miRNAs.
Highlight the targeting difference: siRNAs usually have perfect or near-perfect complementarity to their target mRNA, resulting in cleavage and degradation, whereas miRNAs often have partial complementarity, leading mainly to translational repression or destabilization of the mRNA.
Summarize by noting that despite their differences in origin and targeting mechanisms, both siRNAs and miRNAs play crucial roles in regulating gene expression through the RNAi pathway.
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RNA Interference (RNAi)
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. Both siRNAs and miRNAs function within this pathway to silence genes post-transcriptionally.
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06:59
RNA Interference
Small Interfering RNAs (siRNAs)
siRNAs are short, double-stranded RNA molecules typically derived from exogenous sources like viruses or experimental introduction. They guide the RNA-induced silencing complex (RISC) to perfectly complementary mRNA targets, leading to their cleavage and degradation, thus silencing specific genes.
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MicroRNAs (miRNAs)
miRNAs are endogenous, single-stranded RNA molecules processed from hairpin precursors within the cell. They usually bind imperfectly to target mRNAs, causing translational repression or destabilization rather than direct cleavage, allowing fine-tuned regulation of multiple genes simultaneously.
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06:59RNA Interference
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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
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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Domanda del libro di testo
Present an overview of RNA interference (RNAi). How does the silencing process begin, and what major components participate?
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