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Related Concept Videos

Gene Regulation During Sporulation01:17

Gene Regulation During Sporulation

Sporulation is a complex developmental process that allows certain Gram-positive bacteria, such as Bacillus subtilis and Clostridium species, to survive extreme environmental conditions. This process is tightly regulated by a series of signaling cascades and transcriptional controls, ensuring the formation of a highly resistant endospore.Sporulation is triggered by unfavorable conditions, such as nutrient depletion, and is governed by a phosphorelay system. One of the sensor kinases, such as...
Endospores and Sporulation01:20

Endospores and Sporulation

Endospores are specialized, dormant cells primarily formed by Gram-positive bacteria, including Bacillus and Clostridium, enabling survival under extreme environmental conditions. Due to their unique composition and formation process, these structures are highly resistant to physical and chemical insults, such as extreme heat, ultraviolet and ionizing radiation, desiccation, and toxic chemicals. Rare instances of endospore-like structures have also been observed in some Gram-negative bacteria,...
Bacterial Phylum Actinobacteria01:30

Bacterial Phylum Actinobacteria

Coryneform bacteria are gram-positive, aerobic, nonmotile rods that exhibit irregular, club-shaped, or V-shaped arrangements. Their V-shape results from snapping division, where the inner cell wall layer forms the cross-wall, while the outer layer remains intact until it ruptures on one side, causing the daughter cells to bend away.The primary genera are Corynebacterium and Arthrobacter. Corynebacterium includes diverse species, ranging from saprophytes to pathogens like Corynebacterium...
Tuberculosis01:23

Tuberculosis

Tuberculosis (TB) remains a significant global health concern, primarily targeting the lungs and spreading through airborne transmission. Infection begins when aerosolized droplet nuclei, expelled by an individual with active TB, are inhaled by another person. These microscopic particles carry Mycobacterium tuberculosis, the causative agent of TB. Upon reaching the alveoli, the bacilli are engulfed by alveolar macrophages. However, due to their specialized lipid-rich cell wall, these pathogens...
Fungal Phylum Microsporidia01:28

Fungal Phylum Microsporidia

Microsporidia are a group of obligate intracellular fungi that were initially classified as protists but were later reclassified based on phylogenetic, molecular, and structural evidence linking them to the Chytridiomycota. These unicellular, non-motile organisms are highly specialized parasites that infect a wide range of animal hosts, including humans. They have evolved extensive genomic and metabolic reductions, making them highly dependent on their hosts for survival.Morphology and Genomic...
Pulmonary Tuberculosis II01:28

Pulmonary Tuberculosis II

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...

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Related Experiment Video

Updated: Jun 22, 2026

Visualization of Germinosomes and the Inner Membrane in Bacillus subtilis Spores
08:58

Visualization of Germinosomes and the Inner Membrane in Bacillus subtilis Spores

Published on: April 15, 2019

Sporulation in mycobacteria.

Jaydip Ghosh1, Pontus Larsson, Bhupender Singh

  • 1Department of Cell and Molecular Biology, Biomedical Center, Uppsala University, Uppsala SE-751 24, Sweden.

Proceedings of the National Academy of Sciences of the United States of America
|June 23, 2009
PubMed
Summary
This summary is machine-generated.

Mycobacteria can form spores, similar to well-known bacterial endospores, enabling long-term survival and persistence within hosts. This discovery suggests sporulation as a key mechanism for mycobacterial dormancy and infection.

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Visualization of Germinosomes and the Inner Membrane in Bacillus subtilis Spores
08:58

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Published on: April 15, 2019

Efficient Sporulation of Saccharomyces cerevisiae in a 96 Multiwell Format
08:54

Efficient Sporulation of Saccharomyces cerevisiae in a 96 Multiwell Format

Published on: September 17, 2016

Growth of Mycobacterium tuberculosis Biofilms
09:03

Growth of Mycobacterium tuberculosis Biofilms

Published on: February 15, 2012

Area of Science:

  • Microbiology
  • Pathogen Biology
  • Bacterial Physiology

Background:

  • Mycobacteria are successful pathogens known for their ability to establish latent infections.
  • The molecular mechanisms of mycobacterial dormancy and persistence remain poorly understood.
  • Understanding these mechanisms is crucial for developing new treatment and prevention strategies.

Purpose of the Study:

  • To investigate the potential for sporulation in mycobacteria as a mechanism for dormancy.
  • To identify molecular evidence supporting sporulation in Mycobacterium species.
  • To explore the implications of sporulation for mycobacterial pathogenesis and infection.

Main Methods:

  • Culturing Mycobacterium marinum and Mycobacterium bovis bacillus Calmette-Guérin (BCG) under nutrient-limited conditions.
  • Microscopic and biochemical characterization of spore-like structures.
  • Genomic analysis to identify sporulation gene homologues.
  • Transcriptional analysis of key sporulation genes during different life-cycle stages.

Main Results:

  • Old cultures of Mycobacterium marinum exhibited spore formation, which germinated into vegetative cells upon exposure to fresh medium.
  • These structures displayed characteristics consistent with known bacterial endospores.
  • Homologues of sporulation genes found in Bacillus subtilis and Streptomyces coelicolor were detected in mycobacteria and shown to be transcribed.
  • Evidence suggests that Mycobacterium bovis BCG also forms spores in old cultures.

Conclusions:

  • Sporulation is a viable lifestyle strategy for mycobacteria adapting to environmental stress.
  • This process likely contributes to the dormancy and persistence observed in mycobacterial infections.
  • The findings open avenues for novel prophylactic strategies targeting mycobacterial sporulation.