Genome-Wide Association Studies (GWAS) for Bacteria

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Questions and Answers

What is the name of the transcriptional regulator that activates the ESX-1 secretion system during Mycobacterium tuberculosis infection?

  • GWAS
  • Young
  • espR (correct)
  • Genestet

What is the primary function of the ESX-1 secretion system in Mycobacterium tuberculosis?

  • To release toxins that damage host cells
  • To interrupt key steps in innate immune mechanisms against the pathogen (correct)
  • To promote the adhesion of the bacteria to host cells
  • To enhance the host's innate immune mechanisms against the pathogen

What is the significance of Mtb microdiversity within clinical isolates in relation to TB disease severity?

  • It is associated with decreased TB disease severity
  • It is only found in multidrug-resistant cases
  • It is associated with increased TB disease severity (correct)
  • It has no correlation with TB disease severity

What is the purpose of incubating the bacterial supernatant with washed human cells in a study on Staphylococcus aureus toxicity?

<p>To quantify the toxicity of the bacteria (A)</p> Signup and view all the answers

What is the name of the study that identified new resistance mechanisms in Mycobacterium tuberculosis through genome-wide association studies?

<p>The CRyPTIC Consortium (C)</p> Signup and view all the answers

What is the primary focus of the study by Genestet et al.?

<p>Mycobacterium tuberculosis genetic features associated with pulmonary tuberculosis severity (D)</p> Signup and view all the answers

What was the first successful GWAS that identified the genetic basis of a disease?

<p>Macular degeneration (C)</p> Signup and view all the answers

What is one of the potential applications of GWAS in bacteria?

<p>Identifying genetic basis of antibiotic resistance (D)</p> Signup and view all the answers

Who published a paper on characterizing the genetic basis of bacterial phenotypes using GWAS?

<p>Massey and Read (B)</p> Signup and view all the answers

What was the outcome of the GWAS study on antibiotic resistance in Mycobacterium tuberculosis?

<p>Identified known resistance markers and 39 new genomic regions (A)</p> Signup and view all the answers

What was the number of newly sequenced M. tuberculosis whole genomes used in the GWAS study?

<p>116 (D)</p> Signup and view all the answers

What was the methodology used to identify genomic regions associated with antibiotic resistance in M. tuberculosis?

<p>Genome-wide association study (B)</p> Signup and view all the answers

What was the primary goal of modeling phenotypic, genomic, and clinical data in the described project?

<p>To determine the most predictive features of patient death within 30 days (C)</p> Signup and view all the answers

What was a surprising discovery about capsule expression in the studied bacterial isolates?

<p>That it varies greatly within a single clone (C)</p> Signup and view all the answers

What is a potential application of GWAS in understanding bacteria, according to the text?

<p>Identifying novel virulence traits (D)</p> Signup and view all the answers

What is associated with switching off capsule expression in the studied bacterial isolates?

<p>Polymorphisms in the capA gene (A)</p> Signup and view all the answers

What type of data was modeled in the described project to predict patient death?

<p>Phenotypic, genomic, and clinical data (C)</p> Signup and view all the answers

What is the time frame within which patient death was predicted in the described project?

<p>30 days (D)</p> Signup and view all the answers

What is the result of serum on the expression and activity of toxins in Staphylococcus aureus?

<p>Serum upregulates the expression of toxins but neutralizes their activity (A)</p> Signup and view all the answers

What is the characteristic of bacteraemic isolates in terms of toxicity?

<p>They are less toxic (B)</p> Signup and view all the answers

What is the advantage of low-toxicity bacteria in the bloodstream?

<p>They have improved fitness in the presence of serum (D)</p> Signup and view all the answers

What is the purpose of using transposon mutants in this study?

<p>To functionally verify GWAS results (C)</p> Signup and view all the answers

What is the significance of the Nebraska Transposon Mutant Library (NTML)?

<p>It is a genetic library used for functional verification (A)</p> Signup and view all the answers

What is the relationship between bacterial fitness and toxicity in the bloodstream?

<p>Low-toxicity bacteria are more fit in the bloodstream (C)</p> Signup and view all the answers

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