Biological Science
Biological Science
5th Edition
ISBN: 9780321743671
Author: Scott Freeman
Publisher: PEARSON
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Chapter 25, Problem 11TYU
Summary Introduction

To review:

(a) The evidence that suggests that the evolution of the drug-resistant strain of the bacterium happened within the patient.

(b) The fitness rate of the rpoB (Beta subunit of ribose nucleic acid polymerase) gene in the environment due to the banning of the rifampin antibiotic.

Introduction:

Tuberculosis is a disease of the respiratory tract that is caused by Mycobacterium tuberculosis. A patient with tuberculosis was treated with rifampin antibiotic and the infection was cleared in 10 months. Two months later, the patient was readmitted and was treated with a variety of different antibiotics including rifampin, but dies because of respiratory failure because the antibiotic was not effective on the mutant bacteria mutated for rpoB gene. The nucleotide sequence of the bacteria before and after the treatment was analyzed.

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A hypothetical gene for cephalosporin resistance is found to be carried by a transposon. Explain what a transposon is. Then explain how the cephalosporin resistance could be horizontally transferred between organisms by transformation, conjugation, and transduction. What steps/events would have to occur to allow the transposon to be transferred by each method. Also, explain how it could be transferred vertically between organisms.
The journal article "On the rapidity of antibiotic resistance evolution facilitated by a concentration gradient [See #1 for  reference]" used the methods of "Mutational pathway determines whether drug gradients accelerate evolution of drug-resistant cells [See #2 for reference]".   Reference used #1 : Hermsen, R., Deris, J. B., & Hwa, T. (2012). On the rapidity of antibiotic resistance evolution facilitated by a concentration gradient. Proceedings of the National Academy of Sciences, 109(27), 10775–10780. doi:10.1073/pnas.1117716109 #2 : Greulich, P., Waclaw, B., & Allen, R. J. (2012). Mutational Pathway Determines Whether Drug Gradients Accelerate Evolution of Drug-Resistant Cells. Physical Review Letters, 109(8). doi:10.1103/physrevlett.109.0881   QUESTIONS: 1. Based on Biological and Science manner, what is your comment/feedback on how the research articles/author presented their used material and methods?
"On the rapidity of antibiotic resistance evolution facilitated by a concentration gradient"   ABSTRACT The rapid emergence of bacterial strains resistant to multiple antibiotics is posing a growing public health risk. The mechanisms underlying the rapid evolution of drug resistance are, however, poorly understood. The heterogeneity of the environments in which bacteria encounter antibiotic drugs could play an important role. E.g., in the highly compartmentalized human body, drug levels can vary substantially between different organs and tissues. It has been proposed that this could facilitate the selection of resistance mutants, and recent experiments support this. To study the role of spatial heterogeneity in the evolution of drug resistance, we present a quantitative model describing an environment subdivided into relatively isolated compartments with various antibiotic concentrations, in which bacteria evolve under the stochastic processes of proliferation, migration, mutation and…
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