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Ch. 12 - Regulation of Gene Expression in Bacteria and Bacteriophage
Sanders - Genetic Analysis: An Integrated Approach 3rd Edition
Sanders3rd EditionGenetic Analysis: An Integrated ApproachISBN: 9780135564172Not the one you use?Change textbook
All textbooksSanders 3rd EditionCh. 12 - Regulation of Gene Expression in Bacteria and BacteriophageProblem 31
Chapter 12, Problem 31

How could antisense RNA be used as an antibiotic? What types of genes would you target using this scheme?

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1
Understand the concept of antisense RNA: Antisense RNA is a single-stranded RNA molecule that is complementary to a specific mRNA sequence. When it binds to the target mRNA, it prevents translation by blocking ribosome binding or promoting mRNA degradation.
Identify the mechanism of action: Antisense RNA can be used as an antibiotic by targeting essential bacterial genes. By preventing the expression of these genes, the bacteria cannot perform critical functions, leading to their death or inability to reproduce.
Determine the types of genes to target: Focus on genes that are essential for bacterial survival, such as those involved in cell wall synthesis (e.g., *murA*), protein synthesis (e.g., *rpsL*), DNA replication (e.g., *gyrA*), or metabolic pathways unique to bacteria.
Design the antisense RNA: Create an antisense RNA sequence that is complementary to the mRNA of the target gene. Ensure that the sequence is specific to bacterial mRNA to avoid off-target effects on human cells.
Consider delivery methods: Explore methods to deliver the antisense RNA into bacterial cells, such as using liposomes, nanoparticles, or engineered bacteriophages, to ensure the RNA reaches its target effectively.

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Key Concepts

Here are the essential concepts you must grasp in order to answer the question correctly.

Antisense RNA

Antisense RNA is a strand of RNA that is complementary to a specific mRNA molecule. By binding to this mRNA, antisense RNA can inhibit the translation of the target gene, effectively silencing its expression. This mechanism can be harnessed to disrupt the production of proteins essential for bacterial survival, making it a potential strategy for developing antibiotics.
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Gene Targeting

Gene targeting involves selecting specific genes that are crucial for the pathogenicity or survival of bacteria. By identifying genes that encode for essential proteins, such as those involved in cell wall synthesis or metabolic pathways, researchers can design antisense RNA molecules that specifically inhibit these genes, leading to the death or incapacitation of the bacteria.
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Antibiotic Resistance

Antibiotic resistance occurs when bacteria evolve mechanisms to resist the effects of drugs that once killed them or inhibited their growth. Using antisense RNA as an antibiotic strategy may help circumvent traditional resistance mechanisms, as it targets the genetic expression directly rather than the protein function, potentially reducing the likelihood of resistance development.
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Related Practice
Textbook Question

The function of tRNA synthetases is to attach amino acids to tRNAs. Suppose the tRNA synthetase responsible for attaching tryptophan to tRNA is mutated in a bacterial strain, with the result that the tRNA synthetase functions at about 15% of the efficiency of the wild-type tRNA synthetase. Would formation of the 3–4 stem-loop structure in mRNA be more frequent or less frequent in the mutant strain than in the wild-type strain? Why?

Textbook Question

The following hypothetical genotypes have genes A, B, and C corresponding to lacI, lacO, and lacZ, but not necessarily in that order. Data in the table indicate whether β-galactosidase is produced in the presence and absence of the inducer for each genotype. Use these data to identify the correspondence between A, B, and C and the lacI, lacO, and lacZ genes. Carefully explain your reasoning for identifying each gene.

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Textbook Question

The function of tRNA synthetases is to attach amino acids to tRNAs. Suppose the tRNA synthetase responsible for attaching tryptophan to tRNA is mutated in a bacterial strain, with the result that the tRNA synthetase functions at about 15% of the efficiency of the wild-type tRNA synthetase.

How would this mutation affect attenuation of the tryptophan operon? Explain your answer.

Textbook Question

For an E. coli strain with the lac operon genotype I⁺ P⁺ O⁺ Z⁺ Y⁺, identify the level of transcription of the operon genes in each growth medium listed. Specify transcription as 'none,' 'basal,' or 'activated' for each medium, and provide an explanation to justify your answer.

Growth medium contains glucose but no lactose.

Textbook Question

For an E. coli strain with the lac operon genotype I⁺ P⁺ O⁺ Z⁺ Y⁺, identify the level of transcription of the operon genes in each growth medium listed. Specify transcription as 'none,' 'basal,' or 'activated' for each medium, and provide an explanation to justify your answer.

Growth medium contains lactose but no glucose.

Textbook Question

For an E. coli strain with the lac operon genotype I⁺ P⁺ O⁺ Z⁺ Y⁺, identify the level of transcription of the operon genes in each growth medium listed. Specify transcription as 'none,' 'basal,' or 'activated' for each medium, and provide an explanation to justify your answer.

Growth medium contains lactose and glucose.