Concepts of Genetics (12th Edition)
12th Edition
ISBN: 9780134604718
Author: William S. Klug, Michael R. Cummings, Charlotte A. Spencer, Michael A. Palladino, Darrell Killian
Publisher: PEARSON
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Chapter 18, Problem 2NST
Some scientists use the analogy that the RNA-induced silencing complex (RISC) is a “programmable search engine” that uses miRNAs as programs. What does RISC search for, and how does an miRNA “program” the search? What does RISC do when it finds what it is searching for?
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Students have asked these similar questions
Consider the following sequence fragment of an mRNA. Which of the miRNAS below would be competent for gene silencing?
5'-AUGCAAGCAUUGGCCAAGCUU-3'
5'-AUGCAAGCAUUGGCCAAGCUU-3
5'-UACGUUCGUAACCGGUUCGAA-3'
5'-AAGCUUGGUUAAUGCUUGCAU-3'
5'-UUCGAACCAAUUACGAACGUA-3'
3'-UUCGAACCAAUUACGAACGUA-5
3'-AUGCAAGCAUUGGCCAAGCUU-5'
You are a research scientist studying miRNA processing. You currently know everything about the
pathway except for one detail: whether Dicer resides in the nucleus or in the cytoplasm. You have an
experiment setup where you have a miRNA that completely complements the GFP (green fluorescent
protein) gene in a model yeast cell. You plan to mutate Exportin 5 and make it dysfunctional, then you will
inject synthetic pre-miRNA either in its double strand form or its hairpin single strand form into the cell.
Should you inject the synthetic pre-miRNA into the nucleus or the cytoplasm?
a)
b)
If you inject hairpin single stranded pre-miRNA into the appropriate location in the cell, what
color do you expect the yeast to be if Dicer is in the nucleus? What color would the yeast be if Dicer is in
the cytoplasm? Briefly explain your reasoning.
What would be a possible result if a miRNA that perfectly complemented E3
ligase was successfully processed in the cell?
Chapter 18 Solutions
Concepts of Genetics (12th Edition)
Ch. 18 - Some mutations in the tra gene of Drosophila cause...Ch. 18 - Some scientists use the analogy that the...Ch. 18 - Consider the example that actin mRNA localization...Ch. 18 - What is alternative splicing, where does it occur,...Ch. 18 - What role might the expanded tri- and...Ch. 18 - DM1 is characterized by a phenomenon known as...Ch. 18 - HOW DO WE KNOW? In this chapter, we focused on how...Ch. 18 - CONCEPT QUESTION Review the Chapter Concepts list...Ch. 18 - List three types of alternative splicing patterns...Ch. 18 - Consider the CT/CGRP example of alternative...
Ch. 18 - Explain how the use of alternative promoters and...Ch. 18 - Explain how a tissue-specific RNA-binding protein...Ch. 18 - The regulation of mRNA decay relies heavily upon...Ch. 18 - Nonsense-mediated decay is an mRNA surveillance...Ch. 18 - AU-rich elements (AREs) are cis-elements in mRNAs...Ch. 18 - What are processing bodies (P bodies), and what...Ch. 18 - In 1998, future Nobel laureates Andrew Fire and...Ch. 18 - Present an overview of RNA interference (RNAi)....Ch. 18 - RNAi may be directed by small interfering RNAs...Ch. 18 - Prob. 14PDQCh. 18 - In principle, RNAi may be used to fight viral...Ch. 18 - Prob. 16PDQCh. 18 - Prob. 17PDQCh. 18 - Prob. 18PDQCh. 18 - Prob. 19PDQCh. 18 - How is it possible that a given mRNA in a cell is...Ch. 18 - Prob. 21PDQCh. 18 - Prob. 22PDQCh. 18 - Prob. 23PDQCh. 18 - Prob. 24ESPCh. 18 - Prob. 25ESPCh. 18 - Mutations in the low-density lipoprotein receptor...Ch. 18 - RNA helicases are a class of proteins that bind...Ch. 18 - While miRNA response elements (MREs) may be...Ch. 18 - RNAi is currently being tested as a therapeutic...Ch. 18 - The localization and translational control of...Ch. 18 - Explain how the expression of a single gene can be...
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- 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.arrow_forwardThe number of microRNAs encoded by the genome varies widely among organisms: some species have many miRNA genes and other species have relatively few. Researchers have determined the number of miRNA genes possessed by different species and have made the following observations: Q. The number of miRNA genes found on a chromosome is not correlated with chromosome length. In other words, longer chromosomes do not necessarily have more miRNA genes.arrow_forwardBriefly describe the role of the following RNAS: (i) IncRNA (ii) miRNAarrow_forward
- MicroRNAs (miRNAs) are short, noncoding, single-stranded RNAs approximately 19-25 nucleotides in length that bind to mRNAs. Numerous protein-encoding genes are regulated by miRNAs, including those involved in the immune response. Research has shown that rejection of transplanted organs is associated with alterations in the expression of various genes. To determine whether a link exists between miRNA expression patterns and organ rejection, a team of scientists performed the following set of experiments. Experiment 1 MicroRNA levels were measured in the biopsy specimens of patients with normal transplanted kidneys and patients with kidneys that showed histologic features of acute rejection (AR). MicroRNA sequences are shown in Table 1. Table 1 Normalized miRNA levels miRNA Sequence miR-142-5p 5'-CAUAAAGUAGAAAGCACUACU-3' miR-155 5'-UUAAUGCUAAUCGUGAUAGGGGU-3' Nucleotide Sequences for Mature miRNAs miR-223 miR-10b 5'-UACCCUGUAGAACCGAAUUUGUG-3' let-7c miR-30a-3p 5'-CUUUCAGUCGGAUGUUUGCAGC-3'…arrow_forwardA protein has the following amino acid sequence: Met-Tyr-Asn-Val-Arg-Val-Tyr-Lys-Ala-Lys-Trp-Leu-Ile-His-Thr-Pro You wish to make a set of probes to screen a cDNA library for the sequence that encodes this protein. Your probes should be at least 18 nucleotides in length. Q. Which amino acids in the protein should be used to construct the probes so that the least degeneracy results?arrow_forwardA protein has the following amino acid sequence: Met-Tyr-Asn-Val-Arg-Val-Tyr-Lys-Ala-Lys-Trp-Leu-Ile-His-Thr-Pro You wish to make a set of probes to screen a cDNA library for the sequence that encodes this protein. Your probes should be at least 18 nucleotides in length. Q. How many different probes must be synthesized to be certain that you will find the cDNA sequence that specifies the protein?arrow_forward
- Explain how some lncRNAs serve as molecular decoys for RNA-binding proteins and miRNAs.arrow_forwardThe number of microRNAs encoded by the genome varies widely among organisms: some species have many miRNA genes and other species have relatively few. Researchers have determined the number of miRNA genes possessed by different species and have made the following observations: a. The number of miRNA genes found on a chromosome is not correlated with chromosome length. In other words, longer chromosomes do not necessarily have more miRNA genes. b. Most species show a strong positive correlation between the number of miRNA genes on a chromosome and the number of non-proteinencoding genes on that chromosome. In other words, chromosomes with more non-protein-encoding genes have more miRNA genes. c. Many species display a strong positive correlation between the number of miRNA genes on a chromosome and the number of proteinencoding genes on that chromosome. In other words, chromosomes with more protein-encoding genes have more miRNA genes. Propose possible explanations for these…arrow_forwardThe number of microRNAs encoded by the genome varies widely among organisms: some species have many miRNA genes and other species have relatively few. Researchers have determined the number of miRNA genes possessed by different species and have made the following observations: a. The number of miRNA genes found on a chromosome is not correlated with chromosome length. In other words, longer chromosomes do not necessarily have more miRNA genes. b. Most species show a strong positive correlation between the number of miRNA genes on a chromosome and the number of non-proteinencoding genes on that chromosome. In other words, chromosomes with more non-protein-encoding genes have more miRNA genes. c. Many species display a strong positive correlation between the number of miRNA genes on a chromosome and the number of protein encoding genes on that chromosome. In other words, chromosomes with more protein-encoding genes have more miRNA genes Propose possible explanations for these…arrow_forward
- What are upstream activating sequences (UASs)?arrow_forwardWhat is the principal difference between the binding ofsiRNA and miRNA with mRNA?arrow_forwardThe RNAi and the microRNA (miRNA) pathways share many components and characteristics. What unique feature distinguishes the microRNA pathway from RNAi? a) only the RNAi pathway is initiated by dsRNA molecules b) the miRNA pathway does not require Dicer c) the miRNA pathway does not require RISC. d) miRNAs have 100% complementarity with their mRNA targets to block translation e) siRNAs that act in RNAi have 100% complementarity with their mRNA targets resulting in endonucleolytic cleavagearrow_forward
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