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Related Concept Videos

Pulmonary Tuberculosis II01:28

Pulmonary Tuberculosis II

289
Tuberculosis, or TB, is a bacterial infectious disease caused by Mycobacterium tuberculosis. While its primary impact is on the lungs, leading to pulmonary tuberculosis, it can also affect various other organs, a condition referred to as extrapulmonary tuberculosis.
Here is a detailed explanation of its pathophysiology:
Transmission: The process begins when a person inhales droplet nuclei containing M. tuberculosis. These are typically released into the air when an individual with pulmonary or...
289
Pulmonary Tuberculosis I01:29

Pulmonary Tuberculosis I

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Tuberculosis, often called TB, is a contagious illness primarily caused by Mycobacterium tuberculosis. It mainly affects the lung parenchyma but can also impact other body parts.
Causative Organism
The primary infectious agent causing tuberculosis is Mycobacterium tuberculosis, a slow-growing, acid-fast, aerobic rod that exhibits sensitivity to heat and ultraviolet light. Instances of Mycobacterium bovis and Mycobacterium avium contributing to the development of TB infection are rare.
Mode of...
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Pulmonary Tuberculosis V01:28

Pulmonary Tuberculosis V

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Medical management of tuberculosis (TB) patients involves a comprehensive approach that includes diagnosis, treatment, and monitoring. The specific strategies can vary depending on the type of tuberculosis (latent or active), the patient's overall health status, and other considerations.
Latent tuberculosis infection occurs when TB bacteria are present in a person's body, but are not causing illness or symptoms. It is not contagious, and preventive treatment is crucial to avoid the...
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Pulmonary Tuberculosis III01:31

Pulmonary Tuberculosis III

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Tuberculosis (TB) is a contagious infection primarily affecting the lung parenchyma but which can also affect other body parts. TB can be classified based on disease development, presentation, and the affected anatomical site.
The first classification is based on the development of the disease, and it includes the following categories:
390
Transcription Attenuation in Prokaryotes02:42

Transcription Attenuation in Prokaryotes

15.7K
Transcriptional attenuation occurs when RNA transcription is prematurely terminated due to the formation of a terminator mRNA hairpin structure.  Bacteria use these hairpins to regulate the transcription process and control the synthesis of several amino acids including histidine, lysine, threonine, and phenylalanine. Transcription attenuation takes place in the non-coding regions of mRNA.
There are several different mechanisms used to attenuate transcription. In ribosome mediated...
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Prokaryotic Transcriptional Activators and Repressors01:58

Prokaryotic Transcriptional Activators and Repressors

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The organization of prokaryotic genes in their genome is notably different from that of eukaryotes. Prokaryotic genes are organized, such that the genes for proteins involved in the same biochemical process or function are located together in groups. This group of genes, along with their regulatory elements, are collectively known as an operon. The functional genes in an operon are transcribed together to give a single strand of mRNA known as polycistronic mRNA.
Transcription of prokaryotic...
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Updated: Aug 5, 2025

A Novel Microdissection Approach to Recovering Mycobacterium tuberculosis Specific Transcripts from Formalin Fixed Paraffin Embedded Lung Granulomas
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Reprogramming the Mycobacterium tuberculosis transcriptome during pathogenesis.

Simon J Waddell1

  • 1Brighton and Sussex Medical School, University of Sussex, Brighton BN1 9PX, United Kingdom.

Drug Discovery Today. Disease Mechanisms
|March 27, 2023
PubMed
Summary
This summary is machine-generated.

Mycobacterium tuberculosis alters its metabolism and respiration during infection, using lipids and alternative electron acceptors. Understanding these adaptations in M. tb populations can reveal virulence factors and drug targets for tuberculosis.

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Area of Science:

  • Microbiology
  • Molecular Biology
  • Infectious Diseases

Background:

  • Mycobacterium tuberculosis (M. tb) infection involves significant physiological changes in the pathogen.
  • Understanding M. tb's adaptive strategies is crucial for combating tuberculosis.

Purpose of the Study:

  • To analyze global gene expression datasets of M. tb during infection.
  • To identify virulence determinants and potential drug targets.
  • To elucidate the fundamental biology and pathogenicity mechanisms of M. tb.

Main Methods:

  • Transcriptional profiling of M. tb populations during infection.
  • Analysis of gene expression data to understand metabolic and respiratory adaptations.

Main Results:

  • M. tb adapts its metabolic state, utilizing lipids as a carbon source.
  • M. tb alters its respiratory state, switching to alternative electron acceptors.
  • Gene expression data provides insights into M. tb's survival strategies.

Conclusions:

  • Characterizing M. tb's physiological changes during infection is key to understanding tuberculosis.
  • Identifying M. tb adaptations can lead to novel drug targets and therapeutic strategies.
  • This research highlights mechanisms influencing M. tb pathogenicity.